2024-03-29T15:54:49Zhttps://laur.lau.edu.lb:8443/oai/requestoai:laur.lau.edu.lb:10725/21732019-09-19T08:42:37Zcom_10725_2055col_10725_2075
Habchi, Wassim
2015-09-21T06:25:37Z
2015-09-21T06:25:37Z
2015-09-21
0301-679X
http://hdl.handle.net/10725/2173
https://dx.doi.org/10.1016/j.triboint.2014.01.002
Habchi, W. (2014). A numerical model for the solution of thermal elastohydrodynamic lubrication in coated circular contacts. Tribology International, 73, 57-68.
http://www.sciencedirect.com/science/article/pii/S0301679X14000073
This paper presents a finite element model for the solution of thermal elastohydrodynamic lubrication in coated circular contacts. The model is based on a full-system finite element resolution of the elastohydrodynamic and heat transfer equations. The effects of the coating's thermal and mechanical properties on lubrication performance are investigated. Two categories of surface coatings are considered based on thermal properties: high and low thermal inertia. It is found that low thermal inertia surface coatings act as insulators leading to a localized increase in the lubricant's temperature at the center of the contact. Therefore, friction can be significantly reduced while film thickness is barely affected. The opposite effect is observed for high thermal inertia coatings. These effects increase with coating's thickness.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T06:25:36Z
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N/A
N/A
en
A numerical model for the solution of thermal elastohydrodynamic lubrication in coated circular contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology International
53
477-486
Thermal elastohydrodynamic lubrication
Surface coatings
Finite elements
Circular contacts
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2173/2/license.txt
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ORIGINAL
(Postprint) A Numerical model.pdf
(Postprint) A Numerical model.pdf
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oai:laur.lau.edu.lb:10725/21772016-08-25T07:15:35Zcom_10725_2055col_10725_2075
Habchi, Wassim
Bjorling, M,
Bair, S.
Larsson, R.
Marklund, P.
2015-09-21T07:55:59Z
2015-09-21T07:55:59Z
2015-09-21
0301-679X
http://hdl.handle.net/10725/2177
http://dx.doi.org/10.1016/j.triboint.2013.04.008
Björling, M., Habchi, W., Bair, S., Larsson, R., & Marklund, P. (2013). Towards the true prediction of ehl friction. Tribology International, 66, 19-26.
http://www.sciencedirect.com/science/article/pii/S0301679X13001849
The capability to predict elastohydrodynamic film-thickness and friction from primary measurements of transport properties of liquid has been an elusive goal for tribologists for 50 years. Most comparisons between predictions and experiments involve some amount of tuning of the model in order to match the experimental results. In true prediction, this cannot be done since there are normally no experimental results to compare to. Primary measurements of lubricant transport properties of Squalane were performed, and used in a numerical friction prediction model. Afterwards, friction was measured in a ball-on-disc tribotester. No tuning of the lubricant properties, model or test setup were applied. The current work on EHL-friction is therefore a true representation of the current level of EHL-friction prediction.
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N/A
N/A
en
Towards the True Prediction of EHL Friction
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology International
66
19-26
Elastohydrodynamic
Simulation
Friction
Thermal-effects
ORIGINAL
Towards the true.pdf
Towards the true.pdf
application/pdf
2381094
https://laur.lau.edu.lb:8443/bitstream/10725/2177/1/Towards+the+true.pdf
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LICENSE
license.txt
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text/plain; charset=utf-8
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2016-08-25 10:15:35.626
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oai:laur.lau.edu.lb:10725/21782019-09-19T06:54:56Zcom_10725_2055col_10725_2075
Habchi, Wassim
Bair, S.
Qureshi, F.
Covitch, M.
2015-09-21T08:09:59Z
2015-09-21T08:09:59Z
2013
2015-09-21
1023-8883
http://hdl.handle.net/10725/2178
http://dx.doi.org/10.1007/s11249-012-0078-6
Habchi, W., Bair, S., Qureshi, F., & Covitch, M. (2013). A film thickness correction formula for double-Newtonian shear-thinning in rolling EHL circular contacts. Tribology Letters, 50(1), 59-66.
http://link.springer.com/article/10.1007/s11249-012-0078-6
Lubricants which contain a polymeric thickener will often display a second Newtonian plateau in measured flow curves. Like other manifestations of shear-dependent viscosity, this shear response will lead to an inaccurate prediction when the classical film-thickness formulas are employed. A correction formula has been developed from numerical experiments for a range of parameters of the double-Newtonian modified Carreau equation. The parameters of this shear-thinning model were selected from measurements for real lubricants obtained in Couette viscometers and a capillary viscometer. In addition, a full EHL film thickness formula has been derived from the same numerical experiments. The correction formula and the full formula were successfully validated using published film thickness data and published viscosity data for an EHL reference liquid, a polymer solution. Clearly, viscometer measurements of shear-dependent viscosity which contain the inflection leading to the second Newtonian are essential for a film-thickness calculation when a high-molecular-weight component of the lubricant is present.
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N/A
N/A
en
A Film Thickness Correction Formula for Double- Newtonian Shear-Thinning in Rolling EHL Circular Contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology Letters
50
1
59-66
Elastohydrodynamic
Film thickness
Non-Newtonian
Rheology
Pressure-viscosity coefficient
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2178/2/license.txt
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(Postprint) A film.pdf
(Postprint) A film.pdf
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oai:laur.lau.edu.lb:10725/21792019-12-18T09:36:34Zcom_10725_2055col_10725_2075
Habchi, W.
Issa, J.
2015-09-21T08:23:58Z
2015-09-21T08:23:58Z
2013
2015-09-21
0965-9978
http://hdl.handle.net/10725/2179
http://dx.doi.org/10.1016/j.advengsoft.2012.11.009
Habchi, W., & Issa, J. (2013). Fast and reduced full-system finite element solution of elastohydrodynamic lubrication problems: Line contacts. Advances in Engineering Software, 56, 51-62.
http://www.sciencedirect.com/science/article/pii/S0965997812001561
This paper presents a reduced full-system finite element solution of elastohydrodynamic lubrication (EHL) problems. It aims to demonstrate the feasibility of this approach by applying it to the simple isothermal Newtonian line contact case. However the proposed model can be extended to more complex situations. This model is based on a full-system finite element resolution of the EHL equations: Reynolds, linear elasticity and load balance. A reduced model is proposed for the linear elasticity problem. For this, three different techniques are tested: the classical “modal reduction” and “Ritz-vector” methods and a novel “EHL-basis” method. The reduction order in the first two appears to be insufficient and a large number of degrees of freedom is required in order to attain an acceptable solution. On the other hand, the “EHL-basis” method shows up to be much more efficient, requiring only a few degrees of freedom to compose the elastic deformation of the solid components. In addition, a comparison with the full model shows an order of magnitude execution time gain with errors of the order of only 1‰ for the central and minimum film thicknesses.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T08:23:58Z
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Published
N/A
en
Fast and reduced full-system finite element solution of elastohydrodynamic lubrication problems
Line contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Advances in Engineering Software
56
51-62
Elastohydrodynamic lubrication
Line contacts
Finite elements
Model reduction
Coupled multiphysical problem
Full-System approach
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2179/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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(Postprint) Fast.pdf
(Postprint) Fast.pdf
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2019-12-18 11:36:34.203
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oai:laur.lau.edu.lb:10725/21802019-12-13T14:25:51Zcom_10725_2055col_10725_2075
Habchi, W.
Bair, S.
2015-09-21T08:44:00Z
2015-09-21T08:44:00Z
2015-09-21
0022-2305
http://hdl.handle.net/10725/2180
http://dx.doi.org/10.1115/1.4023082
Habchi, W., & Bair, S. (2013). Quantitative compressibility effects in thermal elastohydrodynamic circular contacts. Journal of Tribology, 135(1), 011502.
http://www.sciencedirect.com/science/article/pii/S0301679X12003258
This paper investigates the effects of lubricant compressibility on the film-forming performance of thermal elastohydrodynamic lubricated (EHL) circular contacts. Numerical film thickness predictions using the classical Dowson and Higginson relationship are compared to those that would be obtained using a more realistic compressibility model, all other parameters kept unchanged. This allows an isolation of the realistic compressibility effects on the film-forming performance. For realistic predictions, the authors consider two model liquids from the 1953 report of the ASME Research Committee on Lubrication, the most and the least compressible. The compressibility of these liquids is modeled using the Tait equation of state (EoS) while all other transport properties are kept unchanged for the sake of isolating compressibility effects. In addition, the same typical generalized-Newtonian behavior is assumed for both model liquids. The results reconfirm the well-known observations that minimum film thickness is very little affected by lubricant compressibility while central film thickness decreases linearly with the increase in volume compression of the lubricant. It is also observed that the relative errors on central film thicknesses induced by the use of the Dowson and Higginson relationship for compressibility increase with load and temperature and are very little affected by mean entrainment speed. Compressibility is shown to be a significant source of error in film-derived measurements of pressure-viscosity coefficients especially at high temperature. The thermodynamic scaling that provides an accurate and consistent framework for the correlation of the thermophysical properties of liquids with temperature and pressure requires an accurate equation of state. In brief, this paper highlights the importance of using realistic transport properties modeling based on thermodynamic scaling for an accurate numerical prediction of the performance of EHL contacts
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Published
N/A
en
Quantitative Compressibility Effects in Thermal Elastohydrodynamic Circular Contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
ASME Journal of Tribology
135
1
011502
Lubricant compressibility
Thermal elastohydrodynamic lubrication
Circular contacts
Generalized-Newtonian lubricant
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2180/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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ORIGINAL
(Postprint) Quantitative.pdf
(Postprint) Quantitative.pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/2180/3/%28Postprint%29+Quantitative.pdf
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oai:laur.lau.edu.lb:10725/21812019-09-23T08:58:44Zcom_10725_2055col_10725_2075
Habchi, W.
Bair, S.
Vergne, P.
2015-09-21T08:50:36Z
2015-09-21T08:50:36Z
2015-09-21
0301-679X
http://hdl.handle.net/10725/2181
http://dx.doi.org/10.1016/j.triboint.2012.10.005
Habchi, W., Bair, S., & Vergne, P. (2013). On friction regimes in quantitative elastohydrodynamics. Tribology International, 58, 107-117.
http://www.sciencedirect.com/science/article/pii/S0301679X12003258
This paper identifies the different friction regimes encountered in elastohydrodynamic lubricated point contacts using a quantitative, physics-based approach. The idea is to link different traction regimes to dimensionless numbers and identify ranges of those numbers where a given regime is encountered or dominates the friction response of the contact. A numerical investigation of traction in point contacts lubricated with a typical mineral oil is employed. The measured thermo-physical properties of the oil are used without any modification to force agreement with experiments. The authors propose four friction regimes delimited by the combined values of three dimensionless parameters.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T08:50:36Z
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Published
N/A
en
On friction regimes in quantitative elastohydrodynamics
Article
SOE
N/A
Mechanical Engineering
200804200
wassim.habchi@lau.edu.lb
Tribology International
58
107-117
Elastohydrodynamic lubrication
Traction regimes
Dimensionless numbers
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2181/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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ORIGINAL
(Postprint) On friction.pdf
(Postprint) On friction.pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/2181/3/%28Postprint%29+On+friction.pdf
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2019-09-23 11:58:44.811
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oai:laur.lau.edu.lb:10725/21822019-09-23T09:16:38Zcom_10725_2055col_10725_2075
Habchi, Wassim
Eyheramendy, D.
Vergne, P.
Morales-Espejel, G.
2015-09-21T09:07:39Z
2015-09-21T09:07:39Z
2012
2015-09-21
0965-9978
http://hdl.handle.net/10725/2182
http://dx.doi.org/10.1016/j.advengsoft.2010.09.010
Habchi, W., Eyheramendy, D., Vergne, P., & Morales-Espejel, G. (2012). Stabilized fully-coupled finite elements for elastohydrodynamic lubrication problems. Advances in Engineering Software, 46(1), 4-18.
http://www.sciencedirect.com/science/article/pii/S0965997810001365
This work presents a model for elastohydrodynamic (EHD) lubrication problems. A finite element full-system approach is employed. The hydrodynamic and elastic problems are solved simultaneously which leads to fast convergence rates. The free boundary problem at the contact’s exit is handled by a penalty method. For highly loaded contacts, the standard Galerkin solution of Reynolds equation exhibits an oscillatory behaviour. The use of artificial diffusion techniques is proposed to stabilize the solution. This approach is then extended to account for non-Newtonian lubricant behaviour and thermal effects. Artificial diffusion procedures are also introduced to stabilize the solution at high loads.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T09:07:39Z
No. of bitstreams: 1
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Published
N/A
en
Stabilized Fully-Coupled Finite Elements for Elastohydrodynamic Lubrication Problems
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Advances in Engineering Software,
46
4-18
Finite elements
Elastohydrodynamic lubrication
Artificial diffusion
Full-system approach
Thermal effects
Non-Newtonian lubricants
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2182/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
ORIGINAL
(Postprint) Stabilized.pdf
(Postprint) Stabilized.pdf
application/pdf
1030232
https://laur.lau.edu.lb:8443/bitstream/10725/2182/3/%28Postprint%29+Stabilized.pdf
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2019-09-23 12:16:38.855
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oai:laur.lau.edu.lb:10725/21832019-09-19T08:37:47Zcom_10725_2055col_10725_2075
Habchi, Wassim
Vergne, P.
Bair, S.
Fillot, N.
Morales-Espejel, G. E.
2015-09-21T09:18:47Z
2015-09-21T09:18:47Z
2011
2015-09-21
0301-679X
http://hdl.handle.net/10725/2183
http://dx.doi.org/10.1016/j.triboint.2011.08.010
Habchi, W., Vergne, P., Fillot, N., Bair, S., & Morales-Espejel, G. E. (2011). A numerical investigation of local effects on the global behavior of TEHD highly loaded circular contacts. Tribology International, 44(12), 1987-1996.
http://www.sciencedirect.com/science/article/pii/S0301679X11002295
This paper presents a numerical investigation of the local behavior of highly loaded thermal elastohydrodynamic contacts. The study is a continuation to a previous work of the authors where it was found that neglecting the dependence of lubricants' thermal properties on pressure and temperature leads to an underestimation of friction coefficients under high sliding regime. In this work, the local phenomena behind these observations are investigated. The results suggest that a redistribution of heat from the center of the contact towards the environment is taking place, leading to globally lower temperatures inside the contact, which leads to higher friction coefficients
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T09:18:47Z
No. of bitstreams: 1
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A numercical investigation.pdf: 465065 bytes, checksum: d81e80c71a1e52310739abe804bf11b9 (MD5)
Published
N/A
en
A numerical investigation of local effects on the global behavior of TEHD highly loaded circular contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology International
44
1987-1996
Elastohydrodynamic lubrication
Thermal effects
High loads
Traction
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2183/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
ORIGINAL
(Postprint) A numerical investigation.pdf
(Postprint) A numerical investigation.pdf
application/pdf
972093
https://laur.lau.edu.lb:8443/bitstream/10725/2183/3/%28Postprint%29+A+numerical+investigation.pdf
b8ef21511263bb36be8a3046451cc48e
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oai:laur.lau.edu.lb:10725/2183
2019-09-19 11:37:47.184
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oai:laur.lau.edu.lb:10725/21852019-12-17T14:12:20Zcom_10725_2055col_10725_2075
Habchi, Wassim
Vergne, P.
Eyheramendy, D.
Morales-Espejel, G. E.
2015-09-21T10:38:25Z
2015-09-21T10:38:25Z
2011
2015-09-21
1350-6501
http://hdl.handle.net/10725/2185
http://dx.doi.org/10.1177/1350650111399373
Habchi, W., Vergne, P., Eyheramendy, D., & Morales-Espejel, G. E. (2011). Numerical investigation of the use of machinery low-viscosity working fluids as lubricants in elastohydrodynamic lubricated point contacts. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 225(6), 465-477.
http://pij.sagepub.com/content/225/6/465.short
This study proposes a numerical investigation of the potential use of machinery working fluids as lubricants in contacts operating under an elastohydrodynamic regime. These fluids are usually of very low viscosity and pressure–viscosity dependence. This is why, unmixed with oil, they have been of little interest for the tribological community. Hence, their rheological properties are poorly known. In fact, these are restricted to a narrow range of conditions compared to the range of interest in EHL applications. This is why some measurements are carried out in order to determine both the viscosity and density of these uncommon lubricants. Besides, their viscosity being low, high-mean entrainment speeds are required for a sufficiently thick lubricant film to build up. This leads to an important thermal dissipation within the contact. Thermal effects are included in the analysis in order to make the estimation of film thicknesses and friction coefficients in these contacts as accurate as possible. Results are discussed in the light of the peculiar properties of machinery low-viscosity working fluids.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T10:38:25Z
No. of bitstreams: 0
Made available in DSpace on 2015-09-21T10:38:25Z (GMT). No. of bitstreams: 0
Published
N/A
en
Numerical investigation of the use of machinery low-viscosity working fluids as lubricants in elastohydrodynamic lubricated point contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
IMechE Part J: Journal of Engineering Tribology
225
465-477
Elastohydrodynamic lubrication
Low-viscosity lubricants
Friction
Film thickness
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2185/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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ORIGINAL
(Postprint) Numerical.pdf
(Postprint) Numerical.pdf
application/pdf
824488
https://laur.lau.edu.lb:8443/bitstream/10725/2185/2/%28Postprint%29+Numerical.pdf
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2019-12-17 16:12:20.529
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oai:laur.lau.edu.lb:10725/21842019-09-19T13:57:19Zcom_10725_2055col_10725_2075
Habchi, W.
Matta, C.
Joly-Pottuz, L.
De Barros, M.I.
Martin, J.M.
Vergne, P.
2015-09-21T10:35:44Z
2015-09-21T10:35:44Z
2015-09-21
1023-8883
http://hdl.handle.net/10725/2184
http://dx.doi.org/10.1007/s11249-011-9778-6
Habchi, W., Matta, C., Joly-Pottuz, L., De Barros, M. I., Martin, J. M., & Vergne, P. (2011). Full film, boundary lubrication and tribochemistry in steel circular contacts lubricated with glycerol. Tribology Letters, 42(3), 351-358.
http://link.springer.com/article/10.1007/s11249-011-9778-6
In this article, the lubricating properties of pure glycerol are investigated under both mild and severe EHL regimes. Amazingly low friction coefficients (about 0.01) are reported by experiments in thick film regimes compared to traditional base oils. EHL calculations of film thickness and friction (including thermal effects) predict friction coefficients that are twice those actually found for glycerol. Chemical analysis of glycerol before and after the friction tests were performed by NMR and Karl Fischer methods, and they reveal that water is produced by tribochemical reaction as well as other species like aldehydes. This finding is in agreement with a corrosion pattern observed inside the wear scars of the steel samples. This study provides an explanation to the anomalously low friction observed in the thick film regime. In fact, water produced in the lubricant decreases traction forces due to the drastic decrease of the viscosity of glycerol with water addition.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T10:35:44Z
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Published
N/A
en
Full Film, Boundary Lubrication and Tribochemistry in Steel Circular Contacts Lubricated with Glycerol
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology Letters
42
351-358
Glycerol
EHL lubrication
Tribochemistry
Water lubrication
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
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https://laur.lau.edu.lb:8443/bitstream/10725/2184/2/license.txt
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2019-09-19 16:57:19.879
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oai:laur.lau.edu.lb:10725/21862019-08-30T13:00:09Zcom_10725_2055col_10725_2075
Akle, Barbar J.
Habchi, Wassim
Wallmersperger, Thomas
Akle, Etienne J.
Leo, Donald J.
2015-09-21T10:53:38Z
2015-09-21T10:53:38Z
2011
2015-09-21
0021-8979
http://dx.doi.org/10.1063/1.3556751]
Akle, B. J., Habchi, W., Wallmersperger, T., Akle, E. J., & Leo, D. J. (2011). High surface area electrodes in ionic polymer transducers: numerical and experimental investigations of the electro-chemical behavior. Journal of Applied Physics, 109(7), 074509.
https://vtechworks.lib.vt.edu/bitstream/handle/10919/52009/2011_High_surface_area_electrodes.pdf?sequence=1&isAllowed=y
Ionomeric polymertransducer (IPT) is an electroactive polymer that has received considerable attention due to its ability to generate large bending strain (>5%) and moderate stress at low applied voltages (±2 V). Ionic polymertransducers consist of an ionomer, usually Nafion, sandwiched between two electrically conductiveelectrodes. A novel fabrication technique denoted as the direct assembly process (DAP) enabled controlled electrode architecture in ionic polymertransducers. A DAP built transducer consists of two high surface area electrodes made of electrically conducting particles uniformly distributed in an ionomer matrix sandwiching an ionomer membrane. The purpose of this paper is to investigate and simulate the effect of these high surface area particles on the electro-chemical response of an IPT. Theoretical investigations as well as experimental verifications are performed. The model used consists of a convection-diffusion equation describing the chemical field as well as a Poisson equation describing the electrical field. The two-dimensional model incorporates highly conductive particles randomly distributed in the electrode area. Traditionally, these kinds of electrodes were simulated with boundary conditions representing flat electrodes with a large dielectric permittivity at the polymer boundary. This model enables the design of electrodes with complicated geometrical patterns. In the experimental section, several transducers are fabricated using the DAP process on Nafion 117 membranes. The architecture of the high surface area electrodes in these samples is varied. The concentration of the high surface area RuO2 particles is varied from 30 vol% up to 60 vol% at a fixed thickness of 30 μm, while the overall thickness of the electrode is varied from 10 μm up to 40 μm at a fixed concentration of 45%. The flux and charge accumulation in the materials are measured experimentally and compared to the results of the numerical simulations. Trends of the experimental and numerical investigations are in agreement, while the computational capacity is limiting the ability to add sufficient amount of metal particle to the electrode in order to match the magnitudes.
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Published
N/A
High surface area electrodes in ionic polymer transducers
numerical and experimental investigations of the electro-chemical behavior
SOE
200700940
200804200
N/A
Industrial And Mechanical Engineering
barbar.akle@lau.edu.lb
wassim.habchi@lau.edu.lb
Journal of Applied Physics
109
7
074509-1-074509-8
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2186/2/license.txt
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2019-08-30 16:00:09.587
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oai:laur.lau.edu.lb:10725/21872019-09-20T08:44:38Zcom_10725_2055col_10725_2075
Habchi, Wassim
Vergne, P.
Bair, S.
Andersson, O.
Eyheramendy, D.
Morales-Espejel, G. E.
2015-09-21T11:01:07Z
2015-09-21T11:01:07Z
2010
2015-09-21
0301-679X
http://hdl.handle.net/10725/2187
http://dx.doi.org/10.1016/j.triboint.2009.10.002
Habchi, W., Vergne, P., Bair, S., Andersson, O., Eyheramendy, D., & Morales-Espejel, G. E. (2010). Influence of pressure and temperature dependence of thermal properties of a lubricant on the behaviour of circular TEHD contacts. Tribology International, 43(10), 1842-1850.
http://www.sciencedirect.com/science/article/pii/S0301679X09003028
The aim of this paper is to study the effects of pressure and temperature dependence of a conventional lubricant's thermal properties on the behaviour of heavily loaded thermal elastohydrodynamic lubrication (TEHL) contacts. For this purpose, a typical mineral oil (Shell T9) is selected and the dependence of its transport properties on pressure and temperature is investigated. Appropriate models are then developed for these dependencies. The latter are included in a TEHL solver in order to investigate their effect on the behaviour of circular EHD contacts. The results reveal the necessity of a thermal analysis including the pressure and temperature dependence of thermal properties for a good estimation of film thicknesses and mostly traction coefficients in circular EHD contacts operating under severe conditions. Numerical results are compared with experiments, showing a very good agreement over the considered ranges. This thorough validation of a thermal EHL framework for the calculation of film thickness and friction offers a previously unavailable opportunity to investigate the effects of variations in material properties.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-21T11:01:07Z
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Published
N/A
en
Influence of Pressure and Temperature Dependence of Thermal Properties of a Lubricant on the Behavior of Circular TEHD Contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology International
43
1842-1850
TEHL regime
Heavily loaded contact
Non-Newtonian behaviour
P–T dependence of thermal properties
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2187/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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(Postprint) Influence.pdf
(Postprint) Influence.pdf
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2019-09-20 11:44:38.051
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oai:laur.lau.edu.lb:10725/21922019-08-14T06:18:44Zcom_10725_2055col_10725_2075
Dormois, H.
Fillot, N.
Habchi, W.
Dalmaz, G.
Vergne, P.
Morales-Espejel, G. E.
Ioannides, E.
2015-09-28T12:00:23Z
2015-09-28T12:00:23Z
2010
2015-09-28
0022-2305
http://hdl.handle.net/10725/2192
http://dx.doi.org/10.1115/1.4001104
Dormois, H., Fillot, N., Habchi, W., Dalmaz, G., Vergne, P., Morales-Espejel, G. E., & Ioannides, E. (2010). A numerical study of friction in isothermal EHD rolling-sliding sphere-plane contacts with spinning. Journal of Tribology, 132(2), 021501.
http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468459
This paper presents a study of the spinning influence on film thickness and friction in EHL circular contacts under isothermal and fully flooded conditions. Pressure and film thickness profiles are computed with an original full-system finite element approach. Friction was thereafter investigated with the help of a classical Ree–Eyring model to calculate the longitudinal and transverse shear stresses. An analysis of both the velocity and shear stress distributions at every point of the contact surfaces has allowed explaining the fall of the longitudinal friction coefficient due to the occurrence of opposite shear stresses over the contact area. Moreover in the transverse direction spinning favors large shear stresses of opposite signs, decreasing the fluid viscosity by non-Newtonian effects. These effects have direct and coupled consequences on the friction reduction that is observed in the presence of spinning. They are expected to further decrease friction in real situations due to shear heating.
Submitted by Zeina Saghir (zeina.saghir@lau.edu.lb) 2019-02-07T02:09:08Z
No. of bitstreams: 1
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Made available in DSpace on 2019-02-07T02:09:08Z (GMT). No. of bitstreams: 1
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Published
N/A
en
A numerical study of friction in isothermal EHD rolling-sliding sphere-plane contacts with spinning
Article
SOE
200804200
N/A
Industrial And Mechanical Engineering
wassim.habchi@lau.edu.lb
Journal of Tribology
132
021501-10
Elastohydrodynamic lubrication
Point contact
Spinning
Film thickness
Traction
Non-Newtonian behavior
Complex kinematics
Shear stress distribution
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2192/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/2192
oai:laur.lau.edu.lb:10725/2192
2019-08-14 09:18:44.167
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/21932019-07-29T08:37:04Zcom_10725_2055col_10725_2075
Habchi, W.
Eyheramendy, D.
Bair, S.
Vergne, P.
Morales-Espejel, G.
2015-09-28T12:36:04Z
2015-09-28T12:36:04Z
2008
2015-09-28
1023-8883
http://hdl.handle.net/10725/2193
http://dx.doi.org/10.1007/s11249-008-9310-9
Habchi, W., Eyheramendy, D., Bair, S., Vergne, P., & Morales-Espejel, G. (2008). Thermal elastohydrodynamic lubrication of point contacts using a newtonian/generalized newtonian lubricant. Tribology Letters, 30(1), 41-52.
http://link.springer.com/article/10.1007/s11249-008-9310-9
The classical ElastoHydroDynamic (EHD) theory assumes a Newtonian lubricant and an isothermal operating regime. In reality, lubricating oils do not behave as perfect Newtonian fluids. Moreover, in most operating conditions of an engineering system, especially at high speeds, thermal effects are important and temperature can no longer be considered as constant throughout the system. This is one reason why there has always been a gap between numerical results and experimental data. This paper aims to show that this gap can be reduced by taking into consideration the heat generation that takes place in the contact and using appropriate rheological models. For this, a unique thermal ElastoHydrodynamic lubrication model is developed for both Newtonian and non-Newtonian lubricants. Pressure, film thickness and traction results are then compared to their equivalent isothermal results and experimental data. The agreement between thermal calculations and experiments reveals the necessity of considering thermal effects in EHD models.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-28T12:36:04Z
No. of bitstreams: 1
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Published
N/A
en
Thermal Elastohydrodynamic Lubrication of Point Contacts Using a Newtonian/Generalized Newtonian Lubricant
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology Letters
30
1
41-52
EHL with non-Newtonian lubricants
Thermal effects in EHL
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2193/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/2193
oai:laur.lau.edu.lb:10725/2193
2019-07-29 11:37:04.167
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/21942021-03-19T09:59:47Zcom_10725_2055col_10725_2075
Habchi, Wassim
Eyheramendy, D.
Vergne, P.
Morales-Espejel, G. E.
2015-09-28T12:54:24Z
2015-09-28T12:54:24Z
2008
2016-05-09
0022-2305
http://hdl.handle.net/10725/2194
http://dx.doi.org/10.1115/1.2842246
Habchi, W., Eyheramendy, D., Vergne, P., & Morales-Espejel, G. (2008). A full-system approach of the elastohydrodynamic line/point contact problem. Journal of Tribology, 130(2), 021501.
http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468009
The solution of the elastohydrodynamic lubrication (EHL) problem involves the simultaneous resolution of the hydrodynamic (Reynolds equation) and elastic problems (elastic deformation of the contacting surfaces). Up to now, most of the numerical works dealing with the modeling of the isothermal EHL problem were based on a weak coupling resolution of the Reynolds and elasticity equations (semi-system approach). The latter were solved separately using iterative schemes and a finite difference discretization. Very few authors attempted to solve the problem in a fully coupled way, thus solving both equations simultaneously (full-system approach). These attempts suffered from a major drawback which is the almost full Jacobian matrix of the nonlinear system of equations. This work presents a new approach for solving the fully coupled isothermal elastohydrodynamic problem using a finite element discretization of the corresponding equations. The use of the finite element method allows the use of variable unstructured meshing and different types of elements within the same model which leads to a reduced size of the problem. The nonlinear system of equations is solved using a Newton procedure which provides faster convergence rates. Suitable stabilization techniques are used to extend the solution to the case of highly loaded contacts. The complexity is the same as for classical algorithms, but an improved convergence rate, a reduced size of the problem and a sparse Jacobian matrix are obtained. Thus, the computational effort, time and memory usage are considerably reduced.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2015-09-28T12:54:24Z
No. of bitstreams: 1
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Made available in DSpace on 2015-09-28T12:54:24Z (GMT). No. of bitstreams: 1
A full system approach.pdf: 731006 bytes, checksum: 9abddb0a4dee05e7084ed93d63cf7a00 (MD5)
Published
N/A
en
A Full-System Approach of the Elastohydrodynamic Line/Point Contact Problem
Article
SOE
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
ASME Journal of Tribology
130
021501
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2194/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/2194
oai:laur.lau.edu.lb:10725/2194
2021-03-19 11:59:47.833
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/21952021-03-19T09:59:47Zcom_10725_2055col_10725_2075
Habchi, Wassim
Demirci, I.
Eyheramendy, D.
Morales-Espejel, G. E.
Vergne, P.
2015-09-28T13:14:07Z
2015-09-28T13:14:07Z
2016-05-06
0301-679X
http://hdl.handle.net/10725/2195
http://dx.doi.org/10.1016/j.triboint.2007.01.017
Habchi, W., Demirci, I., Eyheramendy, D., Morales-Espejel, G., & Vergne, P. (2007). A finite element approach of thin film lubrication in circular EHD contacts. Tribology International, 40(10), 1466-1473.
http://www.sciencedirect.com/science/article/pii/S0301679X07000242
http://www.sciencedirect.com/science/article/pii/S0301679X07000242
So far, most of the numerical studies concerning elastohydrodynamic point contact lubrication have been realized using finite differences. This paper describes a finite element approach for the modelling of both, thick and thin film lubrication in circular contacts under isothermal elastohydrodynamic regime. Multigrid techniques are used to accelerate the convergence and reduce calculation time. The use of the finite element method (FEM) offers two advantages: first, the existence of high level ready-to-use Finite Element commercial software which reduces the time spent in implementing the method and second, the easier adaptability to different and various physical models such as lubricant rheology, starvation effects, thermal effects, non-Newtonian behaviour, etc. The numerical model is presented in detail and an example of its adaptation taking into account non-Newtonian effects is shown. Finally, a comparison is made between Newtonian and non-Newtonian solutions, exhibiting differences obtained when using both models, especially at high shear rates where the film thickness and the friction coefficients are overestimated by a Newtonian approach.
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Published
N/A
en
A Finite Element Approach of Thin Film Lubrication in Circular EHD Contacts
Article
SOE
200804200
N/A
Mechanical Engineering
wassim.habchi@lau.edu.lb
Tribology International
40
1466-1473
Finite elements
EHD lubrication
Point contact
Newtonian and non-Newtonian lubricant behaviour
Multigrid techniques
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2195/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/2195
oai:laur.lau.edu.lb:10725/2195
2021-03-19 11:59:47.85
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/23922022-06-01T10:25:57Zcom_10725_2055col_10725_2075
Ghauch, Z. G.
Abou-Jaoude, G. G.
2015-10-30T12:43:20Z
2015-10-30T12:43:20Z
2013
2015-10-30
0045-7949
http://hdl.handle.net/10725/2392
http://dx.doi.org/10.1016/j.compstruc.2012.12.005
Ghauch, Z. G., & Abou-Jaoude, G. G. (2013). Strain response of hot-mix asphalt overlays in jointed plain concrete pavements due to reflective cracking. Computers & Structures, 124, 38-46.
http://www.sciencedirect.com/science/article/pii/S0045794912003057
Reflective cracks appear in asphalt overlays placed on top of a concrete pavement above the locations of joints and cracks in the concrete slab. This paper presents the results of a finite element study on the response at the bottom of the HMA overlay. The effects of subgrade and subbase strengths, vehicle speed, overlay thickness, and pavement temperature are investigated in order to identify the parameters involved in the deterioration of the overlay. An extrapolation of the strain history curve for various pavement design parameters is presented to estimate the number of load repetitions that lead to bottom–up crack initiation.
Submitted by Rana Najjar (rnajjar@lau.edu.lb) on 2015-10-30T12:43:20Z
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Published
N/A
en
Strain response of hot-mix asphalt overlays in jointed plain concrete pavements due to reflective cracking
Article
SOE
200702670
N/A
Civil Engineering
grace.aboujaoude@lau.edu.lb
Computers and Structures
124
38-46
Finite element method
Reflective cracking
Rigid pavement
HMA overlays
Strain response
https://orcid.org/0000-0003-1992-1611
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2392/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/2392
oai:laur.lau.edu.lb:10725/2392
2022-06-01 13:25:57.98
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/23942019-01-14T12:34:44Zcom_10725_2055col_10725_2075
Abou-Jaoude, Grace
Foye, K.C.
Prezzi, M.
Salgado, R.
2015-10-30T13:01:16Z
2015-10-30T13:01:16Z
2009-01
2015-10-30
1090-0241
http://hdl.handle.net/10725/2394
http://dx.doi.org/10.1061/(ASCE)1090-0241(2009)135:1(1)
Foye, K. C., Abou-Jaoude, G., Prezzi, M., & Salgado, R. (2009). Resistance factors for use in load and resistance factor design of driven pipe piles in sands. Journal of geotechnical and geoenvironmental engineering, 135(1), 1-13.
http://ascelibrary.org/doi/abs/10.1061/(ASCE)1090-0241(2009)135:1(1)
Load and resistance factor design of foundations is done in the offshore industry and is now being done in bridge projects in the United States. Common methods used to establish resistance factors include calibration to assumed factors of safety and reliability analysis using field load test databases. Reliability analyses are the preferred tools for this work but the needed probabilistic information regarding design method uncertainty is difficult to obtain. Furthermore, field load test databases, while relatively attractive for assessing design uncertainty, are not able to discriminate between uncertainties caused by soil variability, test methods, and model design relationships. In contrast to previous efforts, this paper illustrates an approach to uncertainty assessment that seeks to isolate the various sources of uncertainty. Using this approach, reliability analysis is used to develop resistance factors for the design of driven pipe piles in sand. The resistance factor results are used to highlight some of the differences between design methods that are exposed by the proposed uncertainty assessment technique. A brief design example is also given that illustrates the use of the resistance factors.
Submitted by Rana Najjar (rnajjar@lau.edu.lb) on 2015-10-30T13:01:16Z
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Published
N/A
en
Resistance Factors for Use in Load and Resistance Factor Design of Driven Pipe Piles in Sands
Article
SOE
200702670
grace.aboujaoude@lau.edu.lb
N/A
Civil Engineering
Journal of Geotechnical and Geoenvironmental Engineering
135
1
1-13
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2394/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/2394
oai:laur.lau.edu.lb:10725/2394
2019-01-14 14:34:44.099
DSpace at LAU
joseph.sayah@lau.edu.lb
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
oai:laur.lau.edu.lb:10725/29902021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean
Tabbara, Mazen
2016-02-03T09:00:42Z
2016-02-03T09:00:42Z
2004
2015-10-21
http://hdl.handle.net/10725/2990
http://dx.doi.org/10.1016/j.compstruc.2004.04.007
Chatila, J., & Tabbara, M. (2004). Computational modeling of flow over an ogee spillway. Computers & structures, 82(22), 1805-1812.
http://www.sciencedirect.com/science/article/pii/S0045794904001841
This paper presents an investigation into the hydraulics of regular ogee-profile spillways. The free-surfaces of the fluid for several flow heads as measured in the hydraulics laboratory are used as benchmarks. The finite element computational fluid dynamics software, ADINA, was used to predict the free surface over an ogee spillway and thus model the flow field. Since the actual flow is turbulent the k–ε flow model was used. For the cases considered in this paper, ADINA predicted reasonable free surface results that are consistent with general flow characteristics over spillways. The results are also in close agreement with measured free-surface profiles over the entire length of the spillway.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-03T09:00:42Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-03T09:00:42Z (GMT). No. of bitstreams: 0
Published
N/A
en
Computational modeling of flow over an ogee spillway
Article
SOE
199690300
199890270
N/A
Civil Engineering
jchatila@lau.edu.lb
mtabbara@lau.edu.lb
Computers & Structures
82
22
1805-1812
Ogee-spillway
Numerical
Experimental
Modeling
Free surface
Finite element
Turbulent flow
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2990/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
1
10725/2990
oai:laur.lau.edu.lb:10725/2990
2021-03-19 11:59:50.081
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/29912021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Chatila, Jean
Awwad, Rita
2016-02-03T09:32:37Z
2016-02-03T09:32:37Z
2005
2016-05-06
0045-7949
http://hdl.handle.net/10725/2991
http://dx.doi.org/10.1016/j.compstruc.2005.04.005
Tabbara, M., Chatila, J., & Awwad, R. (2005). Computational simulation of flow over stepped spillways. Computers & structures, 83(27), 2215-2224.
http://www.sciencedirect.com/science/article/pii/S0045794905002014
Numerical simulations of water flow over stepped spillways with different step configurations are presented. The finite element computational fluid dynamics module of the ADINA software was used to predict the main characteristics of the flow. This included the determination of the water surface, the development of skimming flow over corner vortices, and the determination of energy dissipation. Since the actual flow is turbulent, the k–ε flow model was used. A two-phase solution process was adopted in order to optimize the overall simulation efficiency. In the first phase, a simple yet reasonable water surface consisting of three straight lines was used as an initial guess and was treated as a fixed wall. In the second phase, the results from the first phase were used as initial conditions and the water surface was treated as a free surface that evolved to attain a steady state configuration. For all the cases considered, the predicted water surface profile over the entire length of the spillway was in close agreement with the experimentally measured water surface profile. The predicted energy dissipation was also comparable to the experimentally attained values.
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Published
N/A
en
Computational simulation of flow over stepped spillways
Article
SOE
199890270
199690300
199906210
N/A
Civil Engineering
mtabbara@lau.edu.lb
jchatila@lau.edu.lb
rita.awwad@lau.edu.lb
Computers & Structures
83
27
2215-2224
Stepped spillway
Numerical
Experimental
Modeling
Free surface
Finite element
Turbulent flow
LICENSE
license.txt
license.txt
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10725/2991
oai:laur.lau.edu.lb:10725/2991
2021-03-19 11:59:50.097
DSpace at LAU
joseph.sayah@lau.edu.lb
oai:laur.lau.edu.lb:10725/29922021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
2016-02-03T09:49:46Z
2016-02-03T09:49:46Z
2004
2016-03-07
0225-5189
http://hdl.handle.net/10725/2992
http://dx.doi.org/10.1080/02255189.2004.9668990
Chatila, J. G. (2004). Reclaimed waste water in some Middle Eastern countries: Pricing and perspective. Canadian Journal of Development Studies/Revue canadienne d'études du développement, 25(3), 481-497.
http://www.tandfonline.com/doi/abs/10.1080/02255189.2004.9668990#.V6
Countries of the Middle East are increasingly suffering from shortages and mismanagement of water, a commodity that is becoming of considerable value since water demands are fast approaching the limits of availability. Efficient solutions for water-related problems necessitate the adoption of well-planned policies. The solution must be sought in the optimum use of the available water, and reuse of reclaimed waste water must play a vital part. To meet future water requirements, many countries will have no option but to increase the use of treated waste water and study the viability of waste water reuse alternatives including irrigation of agricultural lands and recharge of groundwater. The cost of waste water treatment depends on the process used and the level of treatment required for a particular use. Data on waste water in the Middle East region are scarce and scattered. The article's main aim is to provide a summary and perspective on the subject and clarify the idea that waste water is not free. This paper describes the different aspects of the waste water—quantities, treatment, potential reuse, and pricing of the treated effluent—in some countries of the Middle East. Many of these countries will have no option but to increase the use of treated waste water—an economically acceptable resource—to reduce the exploitation of scarce water sources and resources. Finally, a set of proposed regulations and recommendations has been developed.
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Published
N/A
en
Reclaimed Waste Water in Some Middle Eastern Countries
Pricing and Perspective
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Canadian Journal of Development Studies
25
3
481-497
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2992/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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10725/2992
oai:laur.lau.edu.lb:10725/2992
2021-03-19 11:59:50.115
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/29932021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
Jurdi, Bassam R.
2016-02-03T10:22:35Z
2016-02-03T10:22:35Z
2004
2016-05-09
0701-1784
http://hdl.handle.net/10725/2993
http://dx.doi.org/10.4296/cwrj147
Chatila, J. G., & Jurdi, B. R. (2004). Stepped spillway as an energy dissipater.Canadian Water Resources Journal, 29(3), 147-158.
http://www.tandfonline.com/doi/abs/10.4296/cwrj147#.V6lvUJh97cs
This paper describes an experimental investigation into the hydraulics of ogee-profile stepped spillways, examines their viability as an alternative to smooth-back spillways and investigates their efficiency in reducing the downstream energy and length of the hydraulic jump. Tests were performed in a long rectangular flume with glass walls on both sides. One smooth model was used as a benchmark for comparison with stepped models made out of a combination of crests and bottoms of different step heights. Significant reductions in terminal velocities and total energies were observed, where the stepped spillway profiles tested proved to be very effective in terms of energy dissipation for flows of the order of the design head or lower. For flows beyond the design head, the effectiveness of the stepped spillway configuration was reduced and became negligible for heads greater than one and a half times the design head. It was concluded that the number of steps is the overbearing factor in expending flow kinetic energy and, therefore, reducing the length of the downstream forming hydraulic jump.
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Published
N/A
en
Stepped Spillway as an Energy Dissipater
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Canadian Water Resources Journal
29
3
147-158
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2993/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/2993
oai:laur.lau.edu.lb:10725/2993
2021-03-19 11:59:50.129
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/29942021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
Townsend, Ron D.
2016-02-03T10:41:24Z
2016-02-03T10:41:24Z
1995
2016-05-10
0315-1468
http://hdl.handle.net/10725/2994
http://dx.doi.org/10.1139/l95-078
Chatila, J. G., & Townsend, R. D. (1995). Modelling floodplain conveyance in compound channel flows. Canadian Journal of Civil Engineering, 22(4), 660-667.
http://www.nrcresearchpress.com/doi/abs/10.1139/l95-078#.V6lvEph97cs
Floodplain conveyance in compound channel flows is examined through applications of the dynamic flow routing model DWOPER to both laboratory and field data sets. Three different approaches regarding the modelling of off-channel storage are considered, namely, the single-channel approach and two interface-plane methods, which artificially separate main channel flows from floodplain flows, using (i) vertical and (ii) diagonal interface planes. The single-channel method, which views composite flow fields as single units without storage, produced significant differences between simulated and observed stage and discharge hydrographs. The vertical interface method gave generally good results in the case of the laboratory data, but was less successful when applied to the field data. The diagonal interface method, which in this instance applied outward-facing diagonal interface planes at the junctions of the main channel and floodplain zones, produced superior results overal
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-03T10:41:24Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-03T10:41:24Z (GMT). No. of bitstreams: 0
Published
N/A
en
Modelling floodplain conveyance in compound channel flows
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Canadian Journal of Civil Engineering
22
4
660-667
Floodplain
Conveyance
Unsteady flow
Compound channels
Off-channel storage
Interface planes
LICENSE
license.txt
license.txt
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oai:laur.lau.edu.lb:10725/29952021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
Townsend, Ron D.
2016-02-03T12:09:05Z
2016-02-03T12:09:05Z
1998
2016-05-12
0701-1784
http://hdl.handle.net/10725/2995
http://dx.doi.org/10.4296/cwrj2303259
Chatila, J. G., & Townsend, R. D. (1998). Modeling of pollutant transport in compound open channels. Canadian Water Resources Journal, 23(3), 259-271.
http://www.tandfonline.com/doi/abs/10.4296/cwrj2303259
In this paper we describe the development and validation of a 2-D finite-difference mathematical model for simulating inert pollutant transport in compound channels. In its formulation the model couples depth-averaged (depth-integrated) versions of the classical 3-D Navier-Stokes equations and the advection-diffusion equation with constant eddy-viscosity model. The numerical solution scheme is Platzman’s space-staggered scheme, and a double time step operation is employed in the analysis. The model is initially validated using laboratory data of continuous-injection dye tracer experiments performed in a large asymmetrical compound-shaped channel at the Hydraulics Laboratory, University of Ottawa. Comparison between predicted and observed dye concentration curves indicates generally good agreement in the overall shapes of the curves, as well as in the peak concentrations and the times to peak.
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Published
N/A
en
Modeling of Pollutant Transport in Compound open Channels
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Canadian Water Resources Journal
23
3
259-271
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
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oai:laur.lau.edu.lb:10725/29962021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
2016-02-03T12:28:11Z
2016-02-03T12:28:11Z
2003
2016-05-11
1366-7017
http://hdl.handle.net/10725/2996
Chatila, J. G. (2003). Laws, policy measures, standards and regulations in the water sector in Lebanon: a review and perspective. Water policy, 5(2), 165-177.
http://wp.iwaponline.com/content/5/2/165
Lebanon is increasingly suffering from shortage and mismanagement of water, which is becoming a commodity of considerable value due to the inadequacy of supply to meet the needs of potential users. Efficient solutions for water-related problems necessitate the adoption of well-planned policies. These policies should concentrate on improving water management, rationalizing water consumption, and augmenting and protecting water supplies. Strict water policy, wastewater treatment and disposal criteria should be in effect in order to avoid contamination and achieve proper management of water resources systems. A system of laws and policies has been developed or under development, in which the government has framed comprehensive codes and regulations including health standards. In this instance, this paper describes different aspects of the laws and applicable policies in the water sector in Lebanon. A set of proposed regulations and recommendations has been developed.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-03T12:28:11Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-03T12:28:11Z (GMT). No. of bitstreams: 0
Published
N/A
en
Laws, policy measures, standards and regulations in the water sector in Lebanon: a review and perspective
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Water policy
5
2
165-177
Current practice
Effluent
Laws
Management
Policies
Private sector
Regulations
Reuse
Standards
Water authorities
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2996/1/license.txt
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oai:laur.lau.edu.lb:10725/29972021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
2016-02-03T12:50:25Z
2016-02-03T12:50:25Z
2005
2016-05-13
1366-7017
http://hdl.handle.net/10725/2997
Chatila, J. G. (2005). Water tariffs in Lebanon: A review and perspective. Water policy, 7(2), 215-226.
http://wp.iwaponline.com/content/7/2/215
Lebanon is increasingly suffering from shortage and mismanagement of water, which is becoming a commodity of considerable value owing to the inadequacy of supply to meet the needs of potential users. Water authorities and establishments fix tariffs that users have to pay to obtain water. In fact, these tariffs should represent the total costs of providing good quality water in adequate quantities. However, currently domestic water tariffs in Lebanon are mostly flat and not enough to cover the salaries of the employees and the charges of minor maintenance works. Domestic water is sold at a nominal daily flow where rates are lower for smaller towns and increase proportionally. In addition, not all subscribers are actually paying their dues and the water authorities are unable to control and limit illegal connections. As for irrigation practices, water is generally priced at a flat rate or at rates that are associated with the area that the users are allowed to invest in. This paper describes the different aspects of the water tariff structures in Lebanon, provides a review of the current water tariffs available for the different sectors and presents recommendations and ideas for a new water tariff system in the newly formed water authorities.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-03T12:50:25Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-03T12:50:25Z (GMT). No. of bitstreams: 0
Published
N/A
en
Water tariffs in Lebanon
A review and perspective
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Water policy
7
2
215-226
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/2997/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/2997
2021-03-19 11:59:50.189
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oai:laur.lau.edu.lb:10725/29982021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
Townsend, Ron D.
2016-02-03T12:58:13Z
2016-02-03T12:58:13Z
1996
2016-05-13
0701-1784
http://hdl.handle.net/10725/2998
http://dx.doi.org/10.4296/cwrj2102131
Chatila, J. G., & Townsend, R. D. (1996). Discharge estimation methods for steady compound channel flows. Canadian Water Resources Journal, 21(2), 131-137.
http://www.tandfonline.com/doi/abs/10.4296/cwrj2102131#.V6luhZh97cs
This study evaluates various alternatives to account for flood plain conveyance in steady compound channel flows. Evaluations are based on applying several traditional discharge estimation methods to a steady, uniform flow laboratory data set. Many of the applied techniques overestimate compound channel discharge. Six interface and two other standard methods for computing discharge in open channels were compared. Each interface method uses a particular arrangement of imaginary interface planes to artificially sub-divide the compound flow field into homogeneous zones. These methods are named for the particular interface plane arrangement adopted. The two standard methods do not involve interface planes. In general, among the methods tested, the outward-facing diagonal interface plane method and the vertical interface plane method produced the most accurate simulations.
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Published
N/A
en
Discharge estimation methods for steady Compound Channel flows
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Canadian Water Resources Journal
21
2
131-137
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/2998
2021-03-19 11:59:50.203
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/29992021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Chatila, Jean G.
2016-02-03T13:05:46Z
2016-02-03T13:05:46Z
2003
2016-05-16
0701-1784
http://hdl.handle.net/10725/2999
http://dx.doi.org/10.4296/cwrj2803481
Chatila, J. G. (2003). Muskingum Method, EXTRAN and ONE-D for routing unsteady flows in open channels. Canadian Water Resources Journal, 28(3), 481-498.
http://www.tandfonline.com/doi/abs/10.4296/cwrj2803481#
In the present study the numerical modelling aspects of unsteady flow in simple and compound channels are examined through the application to a laboratory data set of the simple hydrologic routing method Muskingum and the unsteady flow dynamic routing models EXTRAN and ONE-D. Model simulations were compared and evaluated by applying various statistical measures to determine the degree of goodness-of-fit between simulated and observed hydrographs. In terms of overall performance, the Muskingum method proved to be a simple and reliable method avoiding complicated mathematical and numerical computations for the cases considered.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-03T13:05:46Z
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Published
N/A
en
Muskingum Method, EXTRAN and ONE-D for Routing Unsteady Flows in Open Channels
Article
SOE
199690300
N/A
Civil Engineering
jchatila@lau.edu.lb
Canadian Water Resources Journal
28
3
481-498
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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8a4605be74aa9ea9d79846c1fba20a33
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10725/2999
oai:laur.lau.edu.lb:10725/2999
2021-03-19 11:59:50.217
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30002021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Mansour, Charbel
Zgheib, Elias
Saba, Sabine
2016-02-04T07:13:41Z
2016-02-04T07:13:41Z
2011
2016-02-02
1876-6102
http://hdl.handle.net/10725/3000
https://doi.org/10.1016/j.egypro.2011.05.030
Mansour, C., Zgheib, E., & Saba, S. (2011). Evaluating impact of electrified vehicles on fuel consumption and CO2 emissions reduction in Lebanese driving conditions using onboard GPS survey. Energy Procedia, 6, 261-276.
https://www.sciencedirect.com/science/article/pii/S187661021101441X
Reviewing past and current mobility assessments for the Lebanese road transport sector, road mobility demand has experienced a real explosion since 1990, and the trend is strongly upward over the decade to come. This growth is mainly attributed to the raise of daily passenger trips and the increase of car ownership. Moreover, this increase in mobility demand results in severe congestion, mostly in Greater Beirut Area (GBA), which leads to chaotic traffic conditions. As a result, Lebanese citizens are suffering from high budget required for transport, high dependence on fossil fuels, in addition to high pollution level particularly in urban areas. Therefore, reducing the fuel consumption and emissions of Lebanese road transport, particularly for passenger cars, has become a must. Electrification of conventional Internal Combustion Engine Vehicles (ICEV) nowadays appears as an effective solution of paramount importance for car manufacturers, facing the challenge of minimizing the consumption of the road transport. Therefore, the objective of this paper is to present latest technological advancements of hybrid electric vehicles and to assess their impacts in terms of fuel savings in Lebanese urban driving conditions. The logic of vehicle electrification is outlined first by presenting the technological advantages with respect to conventional vehicles. Then the paper addresses a tank-to-wheel energy consumption comparison and an operating costs comparison between several hybrid electric vehicle types and a reference conventional vehicle, on real world driving cycles, representative of GBA driving conditions. Driving cycles are collected during a survey on real route in GBA using onboard GPS devices equipped with data loggers. Finally, an assessment of fuel consumption and CO2 emissions of the Lebanese car fleet is presented, in addition to a methodology for creating mitigation scenarios serving to reduce consumption and emissions by 2020.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-04T07:13:41Z
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Published
N/A
en
Evaluating impact of electrified vehicles on fuel consumption and CO2 emissions reduction in Lebanese driving conditions using onboard GPS survey
Article
SOE
201001655
N/A
Industrial & Mechanical Engineering
charbel.mansour@lau.edu.lb
Energy Procedia
6
261-276
Beirut driving conditions
Electrified vehicles
Energy consumption
CO2 emission
Operating cost
Mitigation scenario
ORIGINAL
Evaluating.pdf
Evaluating.pdf
application/pdf
957774
https://laur.lau.edu.lb:8443/bitstream/10725/3000/1/Evaluating.pdf
f38a57be545f6086ae76fc9b878ae74e
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2021-03-19 11:59:50.233
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30012021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Mansour, C.
Clodic, D.
2016-02-04T07:21:57Z
2016-02-04T07:21:57Z
2012
2016-02-16
1229-9138
http://hdl.handle.net/10725/3001
http://dx.doi.org/10.1007/s12239-012-0029-0
Mansour, C., & Clodic, D. (2012). Optimized energy management control for the Toyota hybrid system using dynamic programming on a predicted route with short computation time. International Journal of Automotive Technology, 13(2), 309-324.
http://link.springer.com/article/10.1007/s12239-012-0029-0
Among the general problematic of the HEV power trains, the most critical point is the determination of the power-split ratio between the mechanical and the electrical paths, known as the energy management strategy (EMS). Many EMS are proposed in the literature, and can be grouped in two categories: the local optimization EMS and the global optimization EMS. The local optimization category corresponds to the EMS based on human expertise and the knowledge of the power train components efficiency maps. Thus, the local optimization EMS manages the power train operations by referring to predefined rules. The drawback of such strategies is that it brings an instantaneous fuel consumption optimization, and does not fully optimize the fuel consumption over the whole trip. Therefore, additional fuel savings are still possible. This paper presents an overall optimized predictive EMS for the Toyota Hybrid System (THS-II) power train of the Prius. The proposed EMS is based on Dynamic Programming (DP), where the prior knowledge of the route is required in order to predetermine the power-split ratio and optimize the fuel consumption for the whole predicted route. The DP EMS proposed for the THS-II power train is designed with a very short computation time, intended to be implemented in real-time applications. The potential of this DP-controller in reducing fuel consumption on regulatory cycles are computed and compared to a rule-based controller and to the Prius published fuel consumption results. Finally, the fuel reduction enhancements of the DP-controller are computed for real road tests achieved on a MY06 Prius in Ile-de-France, by comparing to the associated observed consumption measurements.
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Published
N/A
en
Optimized energy management control for the Toyota Hybrid System using dynamic programming on a predicted route with short computation time
Article
SOE
201001655
N/A
Industrial & Mechanical Engineering
charbel.mansour@lau.edu.lb
International Journal of Automotive Technology
13
2
309-324
Dynamic programming
Energy consumption savings
Energy management strategy
Hybrid power-split power train
Predictive control
Rule-based control strategy
Road Test measurements
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3001/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/3001
oai:laur.lau.edu.lb:10725/3001
2021-03-19 11:59:50.248
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30022021-02-15T12:39:31Zcom_10725_2055col_10725_2075
Mansour, C.
Clodic, D.
2016-02-04T07:32:31Z
2016-02-04T07:32:31Z
2012
2016-02-04
1229-9138
http://hdl.handle.net/10725/3002
http://dx.doi.org/10.1007/s12239-012-0013-8
Mansour, C., & Clodic, D. (2012). Dynamic modeling of the electro-mechanical configuration of the Toyota Hybrid System series/parallel power train. International Journal of Automotive Technology, 13(1), 143-166.
https://link.springer.com/article/10.1007%2Fs12239-012-0013-8
The hybridization of the conventional thermal vehicles nowadays constitutes a paramount importance for car manufacturers, facing the challenge of minimizing the consumption of the road transport. Although hybrid power train technologies did not converge towards a single solution, series/parallel power trains with power-split electromechanical transmissions prove to be the most promising hybrid technology. In fact, these power trains show maximum power train overall efficiency and maximum fuel reduction in almost all driving conditions compared to the conventional and other hybrid power trains. This paper addresses the model and design of the electro-mechanical configuration of one of the most effective HEV power trains: case study of the 2nd generation Prius. It presents the simulation work of the overall operation of the Toyota Hybrid System (THS-II) of the Prius, and explores not only its power-split eCVT innovative transmission system but also its overall supervision controller for energy management. The kinematic and dynamic behaviors of the THS-II power train are explained based on the power-split aspect of its transmission through a planetary gear train. Then, the possible regular driving functionalities that result from its eCVT operation and the energy flow within its power train are outlined. A feed-forward dynamic model of the studied power train is next proposed, supervised by a rule-based engineering intuition controller. The energy consumption of the THS-II proposed model has been validated by comparing simulation results to published results on European, American and Japanese regulatory driving cycles.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-04T07:32:31Z
No. of bitstreams: 1
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Published
N/A
en
Dynamic modeling of the electro-mechanical configuration of the Toyota Hybrid System series/parallel power train
Article
SOE
201001655
N/A
Industrial & Mechanical Engineering
charbel.mansour@lau.edu.lb
International Journal of Automotive Technology
13
1
143-166
Hybrid power train
Series/Parallel
Planetary gear train
Power-split transmission
eCVT
Toyota hybrid system (THS)
Prius
Forward-facing model
Energy consumption
Efficiency
Hybrid driving functionalities
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3002/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/3002
oai:laur.lau.edu.lb:10725/3002
2021-02-15 14:39:31.879
DSpace at LAU
joseph.sayah@lau.edu.lb
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
oai:laur.lau.edu.lb:10725/30032021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Bair, Scott
Habchi, Wassim
Sperka, Petr
Hartl, Martin
2016-02-04T11:53:48Z
2016-02-04T11:53:48Z
2016
2016-03-07
1350-6501
http://hdl.handle.net/10725/3003
http://dx.doi.org/10.1177/1350650115600185
Bair, S., Habchi, W., Sperka, P., & Hartl, M. (2016). Quantitative elastohydrodynamic film forming for a gear oil with complex shear-thinning. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 230(3), 289-299.
https://journals.sagepub.com/doi/abs/10.1177/1350650115600185
Perhaps the most thorough characterization of the elevated pressure properties of any commercial EHL lubricant is presented here for a gear oil. Compressibility, thermal conductivity, and low-shear viscosity were measured. Of particular interest is the shear dependence of viscosity, measured across four decades of stress, which shows two transitions each with a specific value of power-law exponent. An attempt to capture a suspected third transition at very high stress resulted in mechanical degradation of the liquid in the viscometer. Numerical simulations of a point contact between a steel ball and a glass disc showed good agreement over a range of slide-to-roll ratio for the measured central thickness. The agreement for the minimum thickness was excellent. A new result is that shear-thinning of a higher molecular weight component that occurs from 3 to 200 kPa had little effect on the film thickness and could therefore be neglected in a film thickness calculation.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-04T11:53:48Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-04T11:53:48Z (GMT). No. of bitstreams: 0
Published
N/A
en
Quantitative elastohydrodynamic film forming for a gear oil with complex shear-thinning
Article
SOE
200804200
N/A
Mechanical Engineering and Petroleum
wassim.habchi@lau.edu.lb
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
230
3
289-299
Elastohydrodynamic film thickness
Elastohydrodynamic lubrication
Rheology
Shear-thinning
Compressibility
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3003/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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(Postprint) Quantitative.pdf
(Postprint) Quantitative.pdf
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2021-03-19 11:59:50.267
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30042021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Fawaz, Wissam F.
Assi, Chadi M.
Khabbaz, Maurice J.
2016-02-05T08:18:58Z
2016-02-05T08:18:58Z
2012
2016-05-06
0090-6778
http://hdl.handle.net/10725/3004
http://dx.doi.org/10.1109/TCOMM.2012.082712.110473
Khabbaz, M. J., Fawaz, W. F., & Assi, C. M. (2012). A probabilistic and traffic-aware bundle release scheme for vehicular intermittently connected networks. Communications, IEEE Transactions on, 60(11), 3396-3406.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6291929
Delay-optimal data delivery in Vehicular Intermittently Connected Networks (VICNs) is challenging since vehicular traffic is affected by numerous recurring and completely random events. Some of these events cause breakdowns and jams while others subserve traffic stability. Researchers observed that mobile vehicles might be wisely exploited to connect two isolated, Stationary Roadside Units (SRUs). In this context, the design of effective delay-minimal data relaying strategies is receiving significant attention. However, many existing such schemes either do not adequately model vehicular traffic behaviours or adapt typical Internet packet-like forwarding protocols to VICNs. In contrast, this manuscript presents a concise, yet comprehensive study of vehicular traffic states based on which a "comme-il-faut" vehicular traffic model is established. This model captures the fundamental traffic characteristics and enables the selection of appropriate distributions for vehicular flow and speeds that parallel the realistic measurements made by traffic theorists. These distributions constitute the basis of a novel Probabilistic Bundle Release Scheme with Bulk Bundle Release (PBRS-BBR) that is proposed with the objective to minimize the average bundle delivery delay. An analytical queueing model is formulated to assess the performance of PBRS-BBR under medium-to-light vehicular traffic. Extensive simulations are conducted to prove the model's validity and accuracy.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T08:18:58Z
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Published
N/A
en
A Probabilistic and Traffic-Aware Bundle Release Scheme for Vehicular Intermittently Connected Networks
Article
SOE
206602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
Communications, IEEE Transactions on
60
11
3396-3406
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3004/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3004
2021-03-19 11:59:50.281
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oai:laur.lau.edu.lb:10725/30052021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Fawaz, Wissam F.
Khabbaz, Maurice J.
Assi, Chadi M.
2016-02-05T08:43:55Z
2016-02-05T08:43:55Z
2012
2016-05-09
1524-9050
http://hdl.handle.net/10725/3005
http://dx.doi.org/10.1109/TITS.2012.2188519
Khabbaz, M. J., Fawaz, W. F., & Assi, C. M. (2012). A simple free-flow traffic model for vehicular intermittently connected networks. Intelligent Transportation Systems, IEEE Transactions on, 13(3), 1312-1326.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6178279&tag=1
The performance of vehicular data networks (VDNs) is highly dependent on vehicular traffic. Existing studies on VDNs consider custom-developed traffic models that mimic real-life vehicular traffic behavior and prepare the ground for accurate VDN performance evaluation. Traffic evolution is affected by numerous random events. Some developed models are microscopic. They independently consider some possible factors (e.g., weather, road geometry, and drivers' skills). These microscopic models are complex, and their implementations may be costly. Other models are macroscopic. They revolve around only the following three major traffic parameters: 1) density; 2) flow; and 3) speed. The majority of such existing models are unrealistic, because they are based on restrictive assumptions tailored to their enclosing study. Comparing the performance of VDN protocols becomes adequate if and only if these protocols are all developed on top of the same traffic model. Unfortunately, the opposite is true. Hence, the design of a generic traffic model that serves as a basis for future studies on VDNs is equally urgent and important. This paper presents a comprehensive and traffic-theory-inspired macroscopic description of vehicular traffic behavior over roadway facilities that operate under free-flow traffic conditions. Accordingly, a simple and tractable macroscopic traffic model is proposed. Extensive simulations are conducted to verify the validity of the proposed model and its high accuracy.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T08:43:55Z
No. of bitstreams: 1
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Published
N/A
en
A Simple Free-Flow Traffic Model for Vehicular Intermittently Connected Networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Transcations on Intelligent Transportation Systems
13
3
1312-1326
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3005/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3005
2021-03-19 11:59:50.296
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30062021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Khabbaz, Maurice J.
Fawaz, Wissam F.
Assi, Chadi M.
2016-02-05T08:53:28Z
2016-02-05T08:53:28Z
2012
2016-05-10
0018-9545
http://hdl.handle.net/10725/3006
http://dx.doi.org/10.1109/TVT.2012.2200001
Khabbaz, M. J., Fawaz, W. F., & Assi, C. M. (2012). Modeling and delay analysis of intermittently connected roadside communication networks. Vehicular Technology, IEEE Transactions on, 61(6), 2698-2706.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6202358
Vehicular networks outline a challenging terrestrial application of the emerging delay-tolerant networking (DTN) paradigm where wireless links experience frequent disruptions. Thus, continuous end-to-end paths are unguaranteed. Under such conditions, mobile vehicles present opportunistic relaying capabilities that promote network connectivity, particularly between stationary and isolated roadside units. In this context, we investigate a challenging information-delivery-delay minimization problem. Information is encapsulated into bundles buffered at the source, and vehicles opportunistically transport them to the destination. Consequently, bundles undergo both queueing and transit delays. We propose a probabilistic bundle release scheme (PBRS) under which a roadside unit performs typical Internet-like forwarding where a single bundle is only released to an arriving relatively high-speed vehicle. This ensures a minimized bundle transit. In contrast, under a greedy bundle release scheme (GBRS), a bundle is released to any arriving vehicle, regardless of its speed. Two queueing models are developed to characterize a roadside unit and evaluate its performance under both schemes. A simulation framework is set up to validate these models. Results indicate the inefficiency of the typical Internet packet-like release mechanism as it incurs excessive bundle queueing delays. A bulk bundle release (BBR) extension is proposed as an effective solution. We show that GBRS-BBR outperforms PBRS-BBR.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T08:53:28Z
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Published
N/A
en
Modeling and Delay Analysis of Intermittently Connected Roadside Communication Networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Transcations on Vehicular Technology
61
6
2698-2706
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3006/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3006
2021-03-19 11:59:50.31
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30072021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Khabbaz, Maurice J.
Assi, Chadi M.
Fawaz, Wissam F.
2016-02-05T09:03:28Z
2016-02-05T09:03:28Z
2012
2016-05-11
1553-877X
http://hdl.handle.net/10725/3007
http://dx.doi.org/10.1109/SURV.2011.041911.00093
Khabbaz, M. J., Assi, C. M., & Fawaz, W. F. (2012). Disruption-tolerant networking: A comprehensive survey on recent developments and persisting challenges. Communications Surveys & Tutorials, IEEE, 14(2), 607-640.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5770277
Nowadays, wireless networks are witnessing several deployments in various extreme environments where they suffer from different levels of link disruptions depending on the severity of the operating conditions. In all cases, their operation requirements are differently altered and their performance is negatively affected rendering them heterogeneous by nature. In the open literature, these networks are known as Intermittently Connected Networks (ICNs). The existing Internet protocols fail to operate properly in the context of ICNs, thus raising a variety of new challenging problems that are attracting the attention of the networking research community. Delay-/Disruption-Tolerant Networking emerged as a highly active area of research where networking experts compete in addressing the various ICN problems. Over time, unicast routing, one of the architectural key components common to all ICNs, became an almost independent field of research in which significant efforts continue to be invested. In contrast, network architectural designs, scheduling and forwarding issues dating from the early days of Inter-Planetary Networks (IPNs) have received relatively little attention and accumulate numerous pending challenges. Moreover, the gap caused by the lack of accurate ICN mathematical models is still large irrespective of some of the appreciated seminal works in this direction. This paper sheds the light over the latest advancements in each of the above-mentioned research sectors and highlight pending open issues in each of them.
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Published
N/A
en
Disruption-Tolerant Networking
A Comprehensive Survey on Recent Developments and Persisting Challenges
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Communications Surveys & Tutorials
14
2
607-640
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
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2021-03-19 11:59:50.325
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oai:laur.lau.edu.lb:10725/30082019-01-31T12:59:40Zcom_10725_2055col_10725_2075
Fawaz, Wissam F.
Khabbaz, Maurice J.
Assi, Chadi M.
2016-02-05T11:19:06Z
2016-02-05T11:19:06Z
2012
2016-02-05
1089-7798
http://hdl.handle.net/10725/3008
http://dx.doi.org/10.1109/LCOMM.2012.042512.112350
Khabbaz, M. J., Fawaz, W. F., & Assi, C. M. (2012). Which vehicle to select?. Communications Letters, IEEE, 16(6), 812-815.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6205423
In wireless networking, an Opportunistic Bundle Release Mechanism (OBRM) is a data bundle forwarding mechanism characterized by its ability to operate over Intermittently Connected Networks (ICNs) where end-to-end paths are not continuously available. Known for their intrinsic connectivity intermittence, vehicular networks constitute an ideal recreation ground for OBRMs. This letter, proposes the Optimal Vehicle Selection OBRM (OVS-OBRM) with the objective of minimizing the average bundle delivery delay.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T11:19:06Z
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Published
N/A
en
Which Vehicle To Select?
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Communications Letters
16
6
812-815
LICENSE
license.txt
license.txt
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1748
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2019-01-31 14:59:40.61
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oai:laur.lau.edu.lb:10725/30092019-01-31T12:55:58Zcom_10725_2055col_10725_2075
Fawaz, Wissam F.
2016-02-05T11:29:32Z
2016-02-05T11:29:32Z
2012
2016-02-05
0140-3664
http://hdl.handle.net/10725/3009
http://dx.doi.org/10.1016/j.comcom.2012.02.003
Fawaz, W. F. (2012). Enhancement of blocking performance in all-optical WDM networks via wavelength reassignment and route deviation. Computer Communications, 35(8), 929-935.
http://www.sciencedirect.com/science/article/pii/S0140366412000503
This paper deals with the problem of improving the performance of all-optical Wavelength Division Multiplexing (WDM) networks in terms of blocking probability. Blocking in such network architecture is caused mainly by the so-called wavelength continuity constraint (wcc), which requires a provisioned lightpath to occupy the same wavelength on all the links along its route. To alleviate the effect of wcc on the blocking performance, a rerouting strategy is proposed. The main idea behind this strategy lies in ensuring the creation of wavelength-continuous routes for the connections that are blocked due to wcc. Particularly, the proposed rerouting strategy is built upon two main pillars, namely wavelength reassignment and route deviation. The former strives to keep the physical route followed by the lightpath intact, while the latter changes the route of the lightpath when wavelength reassignment proves to be ineffective. The performance of the rerouting strategy is studied through extensive simulations in the context of networks employing the least congested path (LCP) routing algorithm and the first-fit (FF) wavelength assignment strategy. The reported results show that the proposed rerouting strategy can guarantee significant enhancement in terms of blocking probability while achieving near-optimal performance for networks utilizing a small number of wavelengths per fiber.
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Published
N/A
en
Enhancement of blocking performance in all-optical WDM networks via wavelength reassignment and route deviation
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
Computer Communications
35
8
929-935
All-optical networks
Wavelength reassignment
Lightpath rerouting
Performance analysis
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3009/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3009
2019-01-31 14:55:58.483
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30102021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Fawaz, Wissam F.
Khabbaz, Maurice J.
Assi, Chadi M.
2016-02-05T11:36:42Z
2016-02-05T11:36:42Z
2011
2016-05-12
1089-7798
http://hdl.handle.net/10725/3010
http://dx.doi.org/10.1109/LCOMM.2011.011011.102512
Khabbaz, M. J., Fawaz, W. F., & Assi, C. M. (2011). Probabilistic bundle relaying schemes in two-hop vehicular delay tolerant networks. Communications Letters, IEEE, 15(3), 281-283.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5692889
One class of Vehicular Delay-Tolerant Networks consists of two node types: stationary and mobile. Stationary nodes deployed along roadsides cannot directly communicate as they are considerably distant. Mobile nodes mounted over vehicles opportunistically entering the range of a stationary source serve as relays that carry bundles to the destination. In this letter, we introduce a novel relaying scheme that probabilistically determines a vehicle's suitability to carry bundles. Hence, bundles are released to a present vehicle if and only if that latter contributes in minimizing the mean transit delay. Extensive simulations were performed to gauge the merit of the proposed scheme.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T11:36:42Z
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Published
N/A
en
Probabilistic Bundle Relaying Schemes in Two-Hop Vehicular Delay Tolerant Networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Communications Letters
15
3
281-283
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3010
2021-03-19 11:59:50.345
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30112021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Fawaz, Wissam
Nakad, Zahi
Aad, Maroun
2016-02-05T11:48:02Z
2016-02-05T11:48:02Z
2011
2016-05-13
1089-7798
http://hdl.handle.net/10725/3011
http://dx.doi.org/10.1109/LCOMM.2011.122010.102058
Fawaz, W., Nakad, Z., & Aad, M. (2011). Preemption-enabled setup of optical connections coupled with event-driven rerouting. Communications Letters, IEEE, 15(2), 250-252.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5674001
In an era of uncertain business tendencies, realizing profitable optical networks is emerging as the most urgent task for optical operators. This task is aggravated by the need to support quality of service (QoS) differentiation, especially with the continuous development of new applications, each having different QoS requirements. This letter proposes to tackle these challenges through the definition of a novel QoS-aware connection setup strategy. The proposed setup approach enables network operators to ensure both efficient utilization of network resources and connection blocking probability differentiation. Resource efficiency is achieved via event-driven rerouting, whereas differentiated blocking probability is realized by preemption. Specifically, high priority connections are equipped with the capability of preempting lower priority connections, which through event-driven rerouting experience smaller blocking probability. Performance of this novel connection setup strategy is analyzed in this letter by simulating its operation in the context of the National Science Foundation Network (NSFNET). The obtained simulation results show that the proposed strategy can minimize the overall blocking probability while achieving QoS differentiation.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T11:48:02Z
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Published
N/A
en
Preemption-Enabled Setup of Optical Connections Coupled with Event-Driven Rerouting
Article
SOE
200602957
200402165
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
zahi.nakad@lau.edu.lb
IEEE Communications Letters
15
2
250 - 252
https://orcid.org/0000-0002-5714-6487
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3011/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3011
oai:laur.lau.edu.lb:10725/3011
2021-03-19 11:59:50.361
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30122021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Fawaz, Wissam
Ouaiss, Iyad
Chen, Ken
Perros, Harry
2016-02-05T11:53:23Z
2016-02-05T11:53:23Z
2010
2016-05-13
1389-1286
http://hdl.handle.net/10725/3012
http://dx.doi.org/10.1016/j.comnet.2010.02.008
Fawaz, W., Ouaiss, I., Chen, K., & Perros, H. (2010). Deadline-based connection setup in wavelength-routed WDM networks. Computer Networks, 54(11), 1792-1804.
http://www.sciencedirect.com/science/article/pii/S1389128610000526
This article addresses the ubiquitous topic of quality of service (QoS) aware connection provisioning in wavelength-routed WDM optical networks. The impact of the connection setup time of an optical connection has not been adequately addressed in the open literature. As such, this paper presents a novel approach that uses the optical connection setup time as a service differentiator during connection provisioning. The proposed approach utilizes the Earliest Deadline First (EDF) queueing algorithm to achieve deadline-based connection setup management with the deadline being the setup time requirement of an optical connection. The proposed EDF-based approach would allow the network operator to improve the QoS perceived by the end clients. Performance of this novel scheme is analyzed by accurately calculating various parameters, such as the fraction of connections provisioned on-time (i.e. prior to deadline expiration) and the average time it takes to successfully setup a connection. In addition, the presented approach is validated by a simulation that analyzes the performance of the proposed connection setup scheme in the specific context of the National Science Foundation Network (NSFNET). The obtained results show that a deadline-based setup strategy can minimize blocking probability while achieving QoS differentiation.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T11:53:23Z
No. of bitstreams: 1
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Published
N/A
en
Deadline-based connection setup in wavelength-routed WDM networks
Article
SOE
200602957
200105659
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
iyad.ouaiss@lau.edu.lb
Computer Networks
54
11
1792-1804
Optical networks
Connection setup management
Earliest Deadline First scheduling
Performance analysis
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3012/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3012
2021-03-19 11:59:50.376
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30132021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Nakad, Z.
Jones, M.
Martin, T.
Fawaz, W.
2016-02-05T11:58:56Z
2016-02-05T11:58:56Z
2010
2016-05-16
0140-3664
http://hdl.handle.net/10725/3013
http://dx.doi.org/10.1016/j.comcom.2009.11.011
Nakad, Z., Jones, M., Martin, T., & Fawaz, W. (2010). Networking in E-textiles. Computer communications, 33(6), 655-666.
http://www.sciencedirect.com/science/article/pii/S0140366409003004
The abundance of fabrics in our life offers immense possibilities for ubiquitous electronic integration. Electronic textiles (e-textiles) represent the merging of fabric and electronic technologies to be used in wearable and large-scale applications. The communication requirements of the computing elements of these systems will be presented along with a fault tolerant solution. The operation of the communication scheme will be studied analytically and compared to simulation results. The graceful deterioration of the performance with increasing faults will also be reported. Multiple e-textile application examples utilizing the networking scheme will be presented.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T11:58:56Z
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Published
N/A
en
Networking in E-textiles
Article
SOE
200602957
200402165
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
zahi.nakad@lau.edu.lb
Computer Communications
33
6
655-666
E-textiles
Fault-tolerance
Interconnection networks
Distributed ubiquitous systems
https://orcid.org/0000-0002-5714-6487
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3013/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/3013
oai:laur.lau.edu.lb:10725/3013
2021-03-19 11:59:50.392
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30142021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Fawaz, Wissam
Khabbaz, Maurice
2016-02-05T12:08:25Z
2016-02-05T12:08:25Z
2009
2016-04-11
1089-7798
http://hdl.handle.net/10725/3014
http://dx.doi.org/10.1109/LCOMM.2009.091594
Fawaz, W., & Khabbaz, M. (2009). Incorporating mutation probability into priority-aware protection in optical networks. Communications Letters, IEEE, 13(11), 865-867.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5337069
A persisting major challenge for optical network operators is to meet the various availability requirements of the different subscribed services through the deployment of effective protection strategies. Priority-aware shared protection is a promising scheme that has been proposed in the open literature as a potential approach to tackling this challenge. However, the priority-aware protection strategy is rigid in the sense that it privileges the high priority connections regardless of the low priority ones. Hence, this letter proposes to improve priority-aware protection by introducing the mutation probability parameter. This parameter expresses the likelihood that a high-priority connection be relegated temporarily to a lower priority level during recovery. In this way, the mutation-based protection strategy offers optical operators the possibility to increase the availability of their low-priority clients without violating the availability requirements of their high-priority ones. Performance of this novel protection strategy is analyzed in this letter by precisely calculating the connection availabilities resulting from its deployment.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T12:08:25Z
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Published
N/A
en
Incorporating mutation probability into priority-aware protection in optical networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Communications Letters
13
11
865-867
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3014/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3014
oai:laur.lau.edu.lb:10725/3014
2021-03-19 11:59:50.406
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30152021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Fawaz, Wissam
Sawah, Timothy
Abou-Rjeily, Chadi
2016-02-05T12:37:54Z
2016-02-05T12:37:54Z
2009
2017-07-27
0140-3664
http://hdl.handle.net/10725/3015
http://dx.doi.org/10.1016/j.comcom.2009.06.010
Fawaz, W., Sawah, T., & Abou-Rjeily, C. (2009). Priority-aware optical shared protection: An offline evaluation study. Computer Communications, 32(15), 1677-1684.
http://www.sciencedirect.com/science/article/pii/S0140366409001534
The availability of an optical connection is considered to be a critical service differentiator in WDM optical networks. In this regard, the design of a protection scheme that improves the availability of high priority optical connections and makes efficient use of optical resources is a major challenge faced by optical network operators. In a previous study, we proposed the so-called priority-aware shared protection survivability scheme as a potential solution to this design issue.
In this paper, we complement our previous study. More specifically, we develop an offline study whose main purpose is to assess the efficiency of the priority-aware shared protection scheme. Through this study, we show that the priority-aware shared protection strategy as opposed to existing protection strategies is able to achieve the best tradeoff between optical resource usage and optical connections’ availability satisfaction.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T12:37:54Z
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Published
N/A
en
Priority-aware optical shared protection
An offline evaluation study
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
Computer Communications
32
15
1677-1684
Optical networks
Protection
Quality of service provisioning
Integer linear programing
Heuristics
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3015/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/3015
oai:laur.lau.edu.lb:10725/3015
2021-03-19 11:59:50.423
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30162021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Fawaz, Wissam
2016-02-05T12:44:05Z
2016-02-05T12:44:05Z
2008
2017-08-10
0733-8716
http://hdl.handle.net/10725/3016
http://dx.doi.org/10.1109/JSAC.2008.080810
Abou-Rjeily, C., & Fawaz, W. (2008). Space-time codes for MIMO ultra-wideband communications and MIMO free-space optical communications with PPM. IEEE Journal on Selected Areas in Communications, 26(6), 938-947.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4586310
In this paper, we consider the problem of space-time (ST) coding with pulse position modulation (PPM). While all the existing ST block codes necessitate rotating the phase or amplifying the amplitude of the transmitted symbols, the proposed scheme can be associated with unipolar PPM constellations without introducing any additional constellation extension. In other words, full transmit diversity can be achieved while conveying the information only through the time delays of the modulated signals transmitted from the different antennas. The absence of phase rotations renders the proposed scheme convenient for low- cost carrier-less multiple-input-multiple-output (MIMO) time- hopping ultra-wideband (TH-UWB) systems and for MIMO free-space optical (FSO) communications with direct detection. In particular, we propose two families of minimal-delay ST block codes that achieve a full transmit diversity order with PPM. Designate by n the number of transmit antennas and by M the number of modulation positions. For a given set of values of (n, m), the first family of codes achieves a rate of 1 symbol per channel use (PCU) which is the highest possible achievable rate when no constellation extensions are introduced. The second family of codes can be applied with a wider range of (n, m) at the expense of a reduced rate given by: R=1/n+n-1/n log2(M-1)/n log2(M).
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T12:44:05Z
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Published
N/A
en
Space-Time Codes for MIMO Ultra-Wideband Communications and MIMO Free-Space Optical Communications with PPM
Article
SOE
200701131
200602957
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
wissam.fawaz@lau.edu.lb
IEEE Journal on selected areas in communications
26
6
938-947
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3016/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/30172019-09-30T13:22:18Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Fawaz, Wissam
2016-02-05T12:49:09Z
2016-02-05T12:49:09Z
2008
2016-02-05
1089-7798
http://hdl.handle.net/10725/3017
http://dx.doi.org/10.1109/LCOMM.2008.071945
Abou-Rjeily, C., & Fawaz, W. (2008). Distributed information-lossless space-time codes for amplify-and-forward TH-UWB systems. IEEE Communications Letters, 12(4), 298-300.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4489673
In this paper, we extend the non-orthogonal amplify-and-forward (NAF) cooperative scheme to the context of impulse radio ultra-wideband (UWB) systems. In particular, we consider the problem of distributed space-time (ST) coding with 2D pulse position modulations (PPM) and joint pulse position and amplitude modulations (PPAM) and we propose the first known family of full-rate codes that are information-lossless with these constellations. Being totally-real, these codes are adapted to the carrier-less nature of the UWB transmissions and they outperform all previously known totally- real constructions with any number of relays. With binary PPM, they satisfy all the construction constraints of the optimal complex-valued codes proposed in [S. Yang and J.-C. Belfore, 2007] as well as the additional constraint of being real-valued.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T12:49:09Z
No. of bitstreams: 1
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Published
N/A
en
Distributed Information-Lossless Space-Time Codes for Amplify-and-Forward TH-UWB Systems
Article
SOE
200602957
200701131
N/A
Civil Engineering
chadi.abourjeily@lau.edu.lb
wissam.fawaz@lau.edu.lb
IEEE Communications Letters
12
4
298-300
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3017/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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Post-print (Distributed).pdf
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oai:laur.lau.edu.lb:10725/3017
2019-09-30 16:22:18.262
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30182019-01-17T13:19:09Zcom_10725_2055col_10725_2075
Fawaz, Wissam
Abou-Rjeily, Chadi
2016-02-05T13:00:25Z
2016-02-05T13:00:25Z
2007
2016-02-05
1089-7798
http://hdl.handle.net/10725/3018
http://dx.doi.org/10.1109/LCOMM.2007.071437
Fawaz, W., Chen, K., & Abou-Rjeily, C. (2007). A novel connection setup management approach for optical WDM networks. Communications Letters, IEEE, 11(12), 998-1000.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4400765
Wavelength Division Multiplexing (WDM) has significantly increased the transmission capacity of today's optical networks. An increase in the available bandwidth is promoting at the same time the introduction of new services, each having different Quality of Service (QoS) requirements. In this regard, QoS parameters applicable to connection setup, namely connection blocking probability and connection setup time, are expected to greatly influence the procedure of lightpath setup. In view of this, we propose to consider the connection setup time requirement as a (timely increasing) priority indicator during optical connection provisioning. In other words, we envisage in this letter the assignment of the highest setup priority to those optical connection requests having the shortest setup time requirements. To achieve this purpose, we adapt the well known Earliest Deadline First (EDF) scheduling discipline to the particular case of optical connection setup management. In order to gauge the impact of our proposal on the QoS perceived by optical clients, we introduce in this letter a computational method. This latter is used for the assessment of the percentage of optical connections that are successfully established under the proposed setup management approach.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T13:00:25Z
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A novel.pdf: 118327 bytes, checksum: 54d3800882dea03c663ea13656ff7ee0 (MD5)
Published
N/A
en
A Novel Connection Setup Management Approach for Optical WDM Networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Communications Letters
11
12
998-1000
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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2019-01-17 15:19:09.67
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oai:laur.lau.edu.lb:10725/30192019-01-31T11:35:59Zcom_10725_2055col_10725_2075
Fawaz, W.
Chen, K.
Pujolle, G.
2016-02-05T13:07:54Z
2016-02-05T13:07:54Z
2007
2016-02-05
0140-3664
http://hdl.handle.net/10725/3019
http://dx.doi.org/10.1016/j.comcom.2007.07.009
Fawaz, W., Chen, K., & Pujolle, G. (2007). Priority-enabled optical shared protection: An online efficiency evaluation study. Computer Communications, 30(18), 3690-3697.
http://www.sciencedirect.com/science/article/pii/S0140366407002836
The availability of an optical connection is considered to be a critical service differentiator in WDM optical networks. In this regard, the design of a protection scheme that is able to improve the availability of high priority connections while making efficient use of optical resources is a major concern for optical network operators. In a previous work, we proposed the so-called priority-aware shared protection as a potential survivability scheme for next generation WDM networks to deal with the previously exhibited concern.
This paper develops an online study whose main purpose is to assess the efficiency of the aforementioned protection scheme. Through this study, we show that the priority-aware shared protection strategy is able to achieve both the best efficiency in terms of resource usage and in terms of availability satisfaction rate compared to existing protection solutions.
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Published
N/A
en
Priority-enabled optical shared protection
An online efficiency evaluation study
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
Computer Communications
30
18
3690-3697
Optical networks
Protection
Quality of service provisioning
Online simulation
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3019/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3019
2019-01-31 13:35:59.256
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oai:laur.lau.edu.lb:10725/30202019-01-31T11:33:08Zcom_10725_2055col_10725_2075
Fawaz, W.
Martignon, F.
Chen, K.
Pujolle, G.
2016-02-05T13:14:36Z
2016-02-05T13:14:36Z
2006
2016-02-05
1748-1252
http://hdl.handle.net/10725/3020
http://dx.doi.org/10.1002/nem.601
Fawaz, W., Martignon, F., Chen, K., & Pujolle, G. (2006). A novel fault management approach for DWDM optical networks. International Journal of Network Management, 16(5), 337-349.
http://onlinelibrary.wiley.com/doi/10.1002/nem.601/abstract
Connection availability is considered as a critical metric when providing differentiated services in Wavelength-Division Multiplexing mesh networks. Indeed, one of the major concerns of optical network operators is related to improving the availability of services provided to their highest-class clients. Achieving this objective is possible through managing faults using the different classical protection schemes, namely the so-called dedicated and shared protection schemes. However, the majority of the work concerning protection schemes has considered the primary connections as equally important when contending for the use of the backup resources. As a main contribution in this paper, we therefore propose an improvement of the existing protection schemes through the introduction of relative priorities among the different primary connections contending for the access to the protection path. To evaluate numerically the benefits of the service differentiation feature introduced in our proposal, we first develop a mathematical model, based on which we derive explicit expressions for the average connection availabilities that result from both the classical protection schemes and the proposed priority-aware one. Through this model, we show how the availability of the highest-class clients is improved when deploying the proposed priority-aware protection scheme. Finally, with the same objective in mind, we develop a simulation study, where a given set of connection demands with predefined availability requirements is provisioned using different protection strategies. Through this study, we show that the priority-aware protection strategy satisfies service-availability requirements in a cost-effective manner compared with the classical protection schemes.Copyright © 2006 John Wiley & Sons, Ltd.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T13:14:36Z
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Published
N/A
en
A novel fault management approach for DWDM optical networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
International Journal of Network Management
16
5
337-349
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
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oai:laur.lau.edu.lb:10725/30212019-01-31T12:50:29Zcom_10725_2055col_10725_2075
Fawaz, Wissam
Daheb, Belkacem
Audouin,Olivier
Pujolle, Guy
2016-02-05T13:19:38Z
2016-02-05T13:19:38Z
2004
2016-02-05
0163-6804
http://hdl.handle.net/10725/3021
http://dx.doi.org/10.1109/MCOM.2004.1262160
Fawaz, W., Daheb, B., Audouin, O., & Pujolle, G. (2004). Service level agreement and provisioning in optical networks. Communications Magazine, IEEE, 42(1), 36-43.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1262160&tag=1
This article proposes a service level agreement applied to the optical domain (O-SLA), which is expected to be the near- and long-term network technology of the great bandwidth capacity offered by optical devices. After an exposition of the rationale behind an optical SLA, parameters that could be included in this O-SLA, as well as their values for four classes of services are proposed. Different client (wavelength or subwavelength) and service types (from leased wavelength to bandwidth on demand) are distinguished when necessary. The last part of this article presents issues related to the provisioning of services emanating from this O-SLA.
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Published
N/A
en
Service level agreement and provisioning in optical networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
IEEE Communications Magazine
42
1
36 - 43
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
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2019-01-31 14:50:29.381
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oai:laur.lau.edu.lb:10725/30222021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Du-Pond, Michel
Audouin, Olivier
Berde, Bela
Daheb, Belkacem
Fawaz, Wissam
Pujolle, Guy
Vigoureux, Martin
2016-02-05T13:30:11Z
2016-02-05T13:30:11Z
2005
2017-04-07
0003-4347
http://hdl.handle.net/10725/3022
http://dx.doi.org/10.1007/BF03219847
Du-Pondd, M., Audouin, O., Berde, B., Daheb, B., Fawaz, W., Pujolle, G., & Vigoureux, M. (2005, October). Service level agreement in optical networks. In Annales des télécommunications (Vol. 60, No. 9-10, pp. 1268-1280). Springer-Verlag.
http://link.springer.com/article/10.1007/BF03219847
This article proposes a Service Level Agreement applied to the optical domain (O-sla), which is expected to be the near and long term network technology thanks, among other things, to the great bandwidth capacity offered by optical devices. After an exposition of the rationale behind an optical sla, parameters which could enter in thisO-sla, as well as their values for four classes of services, are proposed. Different client (wavelength or sub-wavelength) and services types (from leased wavelength to bandwidth on demand) are distinguished when necessary.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-05T13:30:11Z
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Published
N/A
en
Service level agreement in optical networks
Article
SOE
200602957
N/A
Electrical Engineering
wissam.fawaz@lau.edu.lb
Annales Des Télécommunications
60
9
1268-1280
Traffic contract
Quality of Service
Technical specification
Telecommunication network
Optical telecommunication
ORIGINAL
Service.pdf
Service.pdf
application/pdf
1824917
https://laur.lau.edu.lb:8443/bitstream/10725/3022/1/Service.pdf
70890a7fade1fbb0c0b317208f616a4a
MD5
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LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3022
oai:laur.lau.edu.lb:10725/3022
2021-03-19 11:59:50.47
DSpace at LAU
joseph.sayah@lau.edu.lb
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
oai:laur.lau.edu.lb:10725/30252021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Zdenek, P.
Bazant, Luigi Cedolin
Tabbara, Mazen
2016-02-08T12:54:49Z
2016-02-08T12:54:49Z
1991
2017-04-26
0889-3241
http://hdl.handle.net/10725/3025
Bazant, Z. P., Cedolin, L., & Tabbara, M. R. (1991). New method of analysis for slender columns. ACI Structural Journal, 88(4), 391-401.
http://www.civil.northwestern.edu/people/bazant/PDFs/Papers/276.pdf
This paper presents a simple new method to calculate column-interaction
diagrams, which takes into account slenderness effects. The
method consists of a simple incremental-loading algorithm that traces
the load-deflection curve at constant eccentricity of the axial load.
The column failure is defined for design purposes as the peak of the
diagram of axial load versus midlength bending moment at constant
load eccentricity. The tangent modulus load is found to be approximately
equal to the peak load of a column with load eccentricity 0.0}
of the cross-sectional thickness and represents a lower bound for the
maximum loads at still smaller eccentricities. Strain irreversibility at
unloading can be taken into account but its effect is very small. The
method is compared with the AC} moment magnification method and
with the CEB model column method based on moment-curvature relations.
The agreement with the CEB method is very close, but with
respect to the ACI method there are large discrepancies.
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Published
N/A
en
A new method of analysis for slender columns
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
ACI Structural Journal
88
4
391-401
Failure
Loads (forces)
Slenderness ratio
Stress strain relationships
Structural analysis
Structural design
Tangent modulus
ORIGINAL
New method.pdf
New method.pdf
application/pdf
1094450
https://laur.lau.edu.lb:8443/bitstream/10725/3025/1/New+method.pdf
fe852b1bc8b00f7996640c41daaef024
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LICENSE
license.txt
license.txt
text/plain; charset=utf-8
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oai:laur.lau.edu.lb:10725/3025
2021-03-19 11:59:50.487
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oai:laur.lau.edu.lb:10725/30262021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Belytschko, T.
2016-02-08T14:07:06Z
2016-02-08T14:07:06Z
1993
2017-05-23
1097-0207
http://hdl.handle.net/10725/3026
http://dx.doi.org/10.1002/nme.1620362409
Belytschko, T., & Tabbara, M. (1993). H‐Adaptive finite element methods for dynamic problems, with emphasis on localization. International Journal for Numerical Methods in Engineering, 36(24), 4245-4265.
http://onlinelibrary.wiley.com/doi/10.1002/nme.1620362409/full
H-adaptive procedures for the finite element solution of transient solid mechanics problems are studied, with particular emphasis on problems involving localization due to material instability. Various types of error criteria are examined and it is shown that for problems involving plastic response or localization, an error criterion based on an L2-projection of strains is the most effective for the constant strain elements considered here. Examples of one-dimensional and two-dimensional localization (shear band formation) problems are given.
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N/A
N/A
H-Adaptive finite element methods for dynamic problems, with emphasis on localization
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
International Journal of Numerical methods in Engineering
36
24
4245-4265
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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oai:laur.lau.edu.lb:10725/3026
2021-03-19 11:59:50.501
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30272016-08-24T07:55:14Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Blacker, Ted
Belytschko, Ted
2016-02-10T07:39:33Z
2016-02-10T07:39:33Z
1994
2016-02-10
0045-7825
http://hdl.handle.net/10725/3027
http://dx.doi.org/10.1016/0045-7825(94)90084-1
Tabbara, M., Blacker, T., & Belytschko, T. (1994). Finite element derivative recovery by moving least square interpolants. Computer Methods in Applied Mechanics and Engineering, 117(1), 211-223.
http://www.sciencedirect.com/science/article/pii/0045782594900841
A simple, accurate technique for recovery of displcements and derivatives, such as strains is presented. The technique is based on local interpolation of nodal displacements using a moving least square method. The strains are then recovered by taking appropriate derivatives of this interpolant. Numerical experiments in linear elasticity and heat conduction on the convergence and accuracy of the recovered derivatives show very good results and superconvergence for strains in many cases; the technique is also effective for displacement interpolation for projection methods.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T07:39:33Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-10T07:39:33Z (GMT). No. of bitstreams: 0
N/A
N/A
Finite element derivative recovery by moving least square interpolants
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
Computer Methods in Applied Mechanics and Engineering
117
1-2
211-223
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3027/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
1
10725/3027
oai:laur.lau.edu.lb:10725/3027
2016-08-24 10:55:14.662
DSpace at LAU
joseph.sayah@lau.edu.lb
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
oai:laur.lau.edu.lb:10725/30282016-08-08T10:49:03Zcom_10725_2055col_10725_2075
Tabbara, Marc
Belytschko, T.
Lu, Y.Y.
2016-02-10T07:49:54Z
2016-02-10T07:49:54Z
1995
2016-02-10
0020-7683
http://hdl.handle.net/10725/3028
http://dx.doi.org/10.1016/0020-7683(94)00282-2
Belytschko, T., Lu, Y. Y., Gu, L., & Tabbara, M. (1995). Element-free Galerkin methods for static and dynamic fracture. International Journal of Solids and Structures, 32(17), 2547-2570.
http://www.sciencedirect.com/science/article/pii/0020768394002822
Element-free Galerkin (EFG) methods are presented and applied to static and dynamic fracture problems. EFG methods, which are based on moving least-square (MLS) interpolants, require only nodal data; no element connectivity is needed. The description of the geometry and numerical model of the problem consists only of a set of nodes and a description of exterior boundaries and interior boundaries from any cracks. This makes the method particularly attractive for growing crack problems, since only minimal remeshing is needed to follow crack growth. In moving least-square interpolants, the dependent variable at any point is obtained by minimizing a function in terms of the nodal values of the dependent variable in the domain of influence of the point. Numerical examples involving fatigue crack growth and dynamic crack propagation are presented to illustrate the performance and potential of this method.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T07:49:54Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-10T07:49:54Z (GMT). No. of bitstreams: 0
Published
N/A
en
Element-free galerkin methods for static and dynamic fracture
Article
SOE
199890270
N/A
Civil Engineering
International Journal of Solids and Structures
32
17-18
2547-2570
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3028/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
1
10725/3028
oai:laur.lau.edu.lb:10725/3028
2016-08-08 13:49:03.6
DSpace at LAU
joseph.sayah@lau.edu.lb
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
oai:laur.lau.edu.lb:10725/30292016-08-24T07:12:15Zcom_10725_2055col_10725_2075
Belytschko, T.
Lu, Y.Y.
Tabbara, Mazen
2016-02-10T08:03:41Z
2016-02-10T08:03:41Z
1995
2016-02-10
0045-7825
http://hdl.handle.net/10725/3029
http://dx.doi.org/10.1016/0045-7825(95)00804-A
Lu, Y. Y., Belytschko, T., & Tabbara, M. (1995). Element-free Galerkin method for wave propagation and dynamic fracture. Computer Methods in Applied Mechanics and Engineering, 126(1), 131-153.
http://www.sciencedirect.com/science/article/pii/004578259500804A
Element-free Galerkin method (EFG) is extended to dynamic problems. EFG method, which is based on moving least square interpolants (MLS), requires only nodal data; no element connectivity is needed. This makes the method particularly attractive for moving dynamic crack problems, since remeshing can be avoided. In contrast to the earlier formulation for static problems by authors, the weak form of kinematic boundary conditions for dynamic problems is introduced in the implementation to enforce the kinematic boundary conditions. With this formulation, the stiffness matrix is symmetric and positive semi-definite, and hence the consistency, conergence and stability analyses of time integration remain the same as those in finite element method. Numerical examples are presented to illustrate the performance of this method. The relationship between the element-free Galerkin method and the smooth particle hydrodynamics (SPH) method is also discussed in this paper. Results are presented for some one-dimensional problems and two-dimensional problems with static and moving cracks.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T08:03:41Z
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Made available in DSpace on 2016-02-10T08:03:41Z (GMT). No. of bitstreams: 0
N/A
N/A
Element-free Galerkin method for wave propagation and dynamic fracture
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
Computer Methods in Applied Mechanics and Engineering
126
1-2
131-153
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3029/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
1
10725/3029
oai:laur.lau.edu.lb:10725/3029
2016-08-24 10:12:15.419
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30302019-02-01T13:43:05Zcom_10725_2055col_10725_2075
Belytschko, T.
Tabbara, Mazen
2016-02-10T08:17:58Z
2016-02-10T08:17:58Z
2016-02-10
1996
1097-0207
http://hdl.handle.net/10725/3030
http://dx.doi.org/10.1002/(SICI)1097-0207(19960330)39:6<923::AID-NME887>3.0.CO;2-W
Belytschko, T., & Tabbara, M. (1996). DYNAMIC FRACTURE USING ELEMENT‐FREE GALERKIN METHODS. International Journal for Numerical Methods in Engineering, 39(6), 923-938.
http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1097-0207(19960330)39:6%3C923::AID-NME887%3E3.0.CO;2-W/full
The element-free Galerkin method for dynamic crack propagation is described and applied to several
problems. This method is a gridless method, which facilitates the modelling of growing crack problems
because it does not require remeshing; the growth of the crack is modelled by extending its surfaces. The
essential feature of the method is the use of moving least-squares interpolants for the trial-and-test functions.
In these interpolants, the dependent variable is obtained at any point by minimizing a weighted quadratic
form involving the nodal variables within a small domain surrounding the point. The discrete equations are
obtained by a Galerkin method. The procedures for modelling dynamic crack propagation based on
dynamic stress intensity factors are also described.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T08:17:58Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-10T08:17:58Z (GMT). No. of bitstreams: 0
Published
N/A
en
Dynamic fracture using element-free Galerkin methods
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
International Journal for Numerical Engineering
39
923-938
Meshless
Fracture
Dynamic
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3030/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3030
oai:laur.lau.edu.lb:10725/3030
2019-02-01 15:43:05.302
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30312019-02-01T13:40:20Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Stone, C.M.
2016-02-10T08:24:01Z
2016-02-10T08:24:01Z
1998
2016-02-10
0178-7675
http://hdl.handle.net/10725/3031
http://dx.doi.org/10.1007/s004660050354
Tabbara, M. R., & Stone, C. M. (1998). A computational method for quasi-static fracture. Computational Mechanics, 22(2), 203-210.
http://link.springer.com/article/10.1007/s004660050354
A direct method for solving quasi-static, mixed-mode fracture problems is presented. The element-free Galerkin method is used in order to allow for crack growth without remeshing. An expression for the normalized, critical traction is derived in terms of the fracture resistance (R-curve) and a crack-dependent function. Sample problems demonstrate the capability of this method to accurately compute the post-peak equilibrium paths for structures with growing cracks.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T08:24:01Z
No. of bitstreams: 1
A computational.pdf: 419857 bytes, checksum: 02b4068d390d2220d05e93b506d52118 (MD5)
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A computational.pdf: 419857 bytes, checksum: 02b4068d390d2220d05e93b506d52118 (MD5)
Published
N/A
en
A computational method for quasi-static fracture
Article
SOE
199890270
N/A
Civil Engineering
Computational Mechanics
22
2
203-210
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3031/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
10725/3031
oai:laur.lau.edu.lb:10725/3031
2019-02-01 15:40:20.192
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30322016-08-24T10:52:49Zcom_10725_2055col_10725_2075
Warren, Thomas
Tabbara, Mazen
2016-02-10T08:34:31Z
2016-02-10T08:34:31Z
2000
2016-02-10
0020-7683
http://hdl.handle.net/10725/3032
http://dx.doi.org/10.1016/S0020-7683(99)00148-1
Warren, T. L., & Tabbara, M. R. (2000). Simulations of the penetration of 6061-T6511 aluminum targets by spherical-nosed VAR 4340 steel projectiles. International journal of solids and structures, 37(32), 4419-4435.
http://www.sciencedirect.com/science/article/pii/S0020768399001481
In certain penetration events it is proposed that the primary mode of deformation of the target can be approximated by known analytical expressions. In the context of an analysis code, this approximation eliminates the need for discretizing the target as well as the need for a contact algorithm. Thus, this method substantially reduces the computer time and memory requirements. In this paper a forcing function which is derived from a spherical-cavity expansion (SCE) analysis has been implemented in a transient dynamic finite element code. This implementation is capable of computing the structural and component responses of a projectile due to a three dimensional penetration event. Simulations are presented for 7.11-mm-diameter, 74.7-mm-long, spherical-nose, vacuum-arc-remelted (VAR) 4340 steel projectiles that penetrate 6061-T6511 aluminum targets. Final projectile configurations obtained from the simulations are compared with post-test radiographs obtained from the corresponding experiments. It is shown that the simulations accurately predict the permanent projectile deformation for three dimensional loadings due to incident pitch and yaw over a wide range of striking velocities.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T08:34:31Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-10T08:34:31Z (GMT). No. of bitstreams: 0
Published
N/A
en
Simulations of the penetration of 6061-T6511 aluminum targets by spherical-nosed VAR 4340 steel projectiles
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
International Journal of Solids and Structures
37
32
4419-4435
Penetration
Spherical cavity expansion
Finite elements
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3032/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3032
oai:laur.lau.edu.lb:10725/3032
2016-08-24 13:52:49.455
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30332016-08-08T10:45:50Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Karam, Gebran
2016-02-10T09:23:02Z
2016-02-10T09:23:02Z
2015
2016-02-10
0024-9831
http://hdl.handle.net/10725/3033
http://dx.doi.org/10.1680/macr.2004.56.8.461
Karam, G., & Tabbara, M. (2004). Corner effects in CFRP-wrapped square columns. Magazine of Concrete Research, 56(8), 461-464.
http://www.icevirtuallibrary.com/doi/abs/10.1680/macr.2004.56.8.461
An experimental investigation of the corner sharpness effect in square columns with carbon fibre-reinforced polymer (CFRP) wraps is presented using traditional compressive testing of short square columns as well as an innovative set-up that allows testing directly for the CFRP strength when wrapped around the corner of a flat slab. Both types of test confirmed the observation that the confinement efficiency decreases as the corner sharpness increases, owing to stress concentrations that cause localised failure of the CFRP.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T09:23:02Z
No. of bitstreams: 0
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Published
N/A
en
Corner effects in CFRP-wrapped square columns
Article
SOE
199890270
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
mtabbara@lau.edu.lb
Magazine of Concrete Research
56
8
461-464
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3033/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3033
2016-08-08 13:45:50.919
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30342019-01-14T11:15:21Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Karam, Gebran
2016-02-10T09:39:59Z
2016-02-10T09:39:59Z
2005
2016-02-10
1090-0268
http://hdl.handle.net/10725/3034
http://dx.doi.org/10.1061/(ASCE)1090-0268(2005)9:5(388)
Karam, G., & Tabbara, M. (2005). Confinement effectiveness in rectangular concrete columns with fiber reinforced polymer wraps. Journal of Composites for Construction, 9(5), 388-396.
http://ascelibrary.org/doi/abs/10.1061/(ASCE)1090-0268(2005)9:5(388)
An innovative mechanistic based method for passive confinement efficiency estimation is proposed based on the extension to rectangular sections of the pulley model previously proposed by the writers. A refined finite element model was developed using a nonlinear concrete constitutive law in order to analyze stresses in columns passively confined with fiber reinforced polymer wraps. Rectangular and square cross sections of variable corner radii were investigated with reference to a circular cross section. Results showed an increase in corner stresses with sharper corner radii, a localization of failure at the corners, and a decrease in confinement effectiveness with an increase in the rectangularity of the cross section or an increase in corner sharpness. A rigorous numerical method for calculating geometric confinement efficiency factors is proposed and typical factors are calculated and compared with the predictions of the simple pulley model showing good agreement.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T09:39:59Z
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Published
N/A
en
Confinement Effectiveness in Rectangular Concrete Columns with Fiber Reinforced Polymer Wraps
Article
SOE
199890270
199590200
N/A
Civil Engineering
mtabbara@lau.edu.lb
gkaram@lau.edu.lb
Journal of Composites for Construction
9
5
388-396
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3034/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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10725/3034
oai:laur.lau.edu.lb:10725/3034
2019-01-14 13:15:21.344
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30352019-01-14T11:16:02Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Karam, Gebran
2016-02-10T09:47:40Z
2016-02-10T09:47:40Z
2009
2016-02-10
0899-1561
http://hdl.handle.net/10725/3035
http://dx.doi.org/10.1061/(ASCE)0899-1561(2009)21:3(110)
Karam, G., & Tabbara, M. (2009). Hoek–Brown strength criterion for actively confined concrete. Journal of Materials in Civil Engineering, 21(3), 110-118.
http://ascelibrary.org/doi/abs/10.1061/(ASCE)0899-1561(2009)21:3(110)
The application of the Hoek–Brown empirical strength criterion to actively confined concrete is investigated. A large database of experimental results on hydraulically and triaxially confined concrete is reviewed and analyzed. The normalized two-parameter Hoek–Brown criterion provides a simpler and more robust fit than theoretical and empirical models previously proposed in the literature for actively confined concrete. The Hoek–Brown curved failure surface is used to predict the failure angles that are experimentally observed in the brittle mode. A residual stress lower bound is proposed based on the brittle fracture mechanism. The analysis of this residual stress lower bound allows the formal identification of the transition between the brittle and the ductile failure modes in confined concrete. The modeling results are compared with the available published data and good agreement is found between the experimental observations and the predictions of the model. Recommendations for the integration of the Hoek–Brown model in the concrete design equations are also provided.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T09:47:40Z
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Published
N/A
en
Hoek-Brown Strength Criterion for Actively Confined Concrete
Article
SOE
199890270
199590200
N/A
Civil Engineering
mtabbara@lau.edu.lb
gkaram@lau.edu.lb
Journal of Materials in Civil Engineering
21
3
110-118
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3035/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3035
2019-01-14 13:16:02.973
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30362016-08-24T05:27:26Zcom_10725_2055col_10725_2075
Pijaudier‐Cabot, Gilles
Bazant, Zdenek P.
Tabbara, Mazen
2016-02-10T09:53:10Z
2016-02-10T09:53:10Z
1988
2016-02-10
0264-4401
http://hdl.handle.net/10725/3036
http://dx.doi.org/10.1108/eb023732
Pijaudier-Cabot, G., Bazant, Z. P., & Tabbara, M. (1988). Comparison of various models for strain-softening. Engineering computations, 5(2), 141-150.
http://www.emeraldinsight.com/doi/abs/10.1108/eb023732
This paper presents a comparison of various models for strain‐softening due to damage such as cracking or void growth, as proposed recently in the literature. Continuum‐based models expressed in terms of softening stress—strain relations, and fracture‐type models expressed in terms of softening stress—displacement relations are distinguished. From one‐dimensional wave propagation calculations, it is shown that strain‐localization into regions of finite size cannot be achieved. The previously well‐documented spurious convergence is obtained with continuum models, while stress—displacement relations cannot model well smeared‐crack situations. Continuum models may, however, be used in general if a localization limiter is implemented. Gradient‐type localization limiters appear to be rather complicated; they require solving higher‐order differential equations of equilibrium with additional bourdary conditions. Non‐local localization limiters, especially the non‐local continuum with local strain, in which only the energy dissipating variables are non‐local, is found to be very effective, and also seems to be physically realistic. This formulation can correctly model the transition between homogeneous damage states and situations in which damage localizes into small regions that can be viewed as cracks. The size effect observed in the experimental and numerical response of specimens in tension or compression is shown to be a consequence of this progressive transition from continuum‐type to fracture‐type formulations.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T09:53:10Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-10T09:53:10Z (GMT). No. of bitstreams: 0
Published
N/A
en
Comparison of various models for strain‐softening
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
Engineering Computations
5
2
141-150
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3036/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3036
oai:laur.lau.edu.lb:10725/3036
2016-08-24 08:27:26.741
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30372019-02-01T13:38:57Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Warren, T.L.
2016-02-10T10:11:47Z
2016-02-10T10:11:47Z
1992
2016-02-10
0376-9429
http://hdl.handle.net/10725/3037
http://dx.doi.org/10.1007/BF00017341
Bazant, Z. P., & Tabbara, M. R. (1992). Bifurcation and stability of structures with interacting propagating cracks. International journal of fracture, 53(3), 273-289.
http://link.springer.com/article/10.1007/BF00017341#page-1
A general method to calculate the tangential stiffness matrix of a structure with a system of interacting propagating cracks is presented. With the help of this matrix, the conditions of bifurcation, stability of state and stability of post-bifurcation path are formulated and the need to distinguish between stability of state and stability path is emphasized. The formulation is applied to symmetric bodies with interacting cracks and to a halfspace with parallel equidistant cooling cracks or shrinkage cracks. As examples, specimens with two interacting crack tips are solved numerically. It is found that in all the specimens that exhibit a softening load-displacement diagram and have a constant fracture toughness, the response path corresponding to symmetric propagation of both cracks is unstable and the propagation tends to localize into a single crack tip. This is also true for hardening response if the fracture toughness increases as described by an R-curve. For hardening response and constant fracture toughness, on the other hand, the response path with both cracks propagating symmetrically is stable up to a certain critical crack length, after which snapback occurs. A system of parallel cooling cracks in a halfspace is found to exhibit a bifurcation similar to that in plastic column buckling.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T10:11:47Z
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Published
N/A
en
Bifurcation and stability of structures with interacting propagating cracks
Article
SOE
199890270
N/A
Civil Engineering
mtabbara@lau.edu.lb
International Journal of Fracture
53
3
273-289
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3037/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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oai:laur.lau.edu.lb:10725/3037
2019-02-01 15:38:57.4
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30382016-08-08T10:42:16Zcom_10725_2055col_10725_2075
Tabbara, Mazen
Bazant, Zdenek P.
Prat, PereE C.
2016-02-10T12:01:33Z
2016-02-10T12:01:33Z
1990
2016-02-10
0096-7920
http://hdl.handle.net/10725/3038
Bazant, Z. P., Prat, P. C., & Tabbara, M. R. (1990). Antiplane shear fracture tests (Mode III). Materials Journal, 87(1), 12-19.
https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=2302
Mode III (antiplane) shear fracture energies of concrete and mortar were measured on the basis of the size-effect law. The specimens were cylinders with a circumferential notch at midlength, subjected to pure torsion at zero axial force. The specimens were geometrically similar and their sizes varied as 1:2:4. It was observed that the mortar specimens behave closer to linear elastic fracture mechanics than the concrete specimens. The ratio of Mode III to Mode I (tensile) fracture energies was found to be about 3 for concrete and about 8 for mortar. The results indirectly indicate that a volume expansion of the sheared fracture process zone may be a significant mechanism causing transverse tensile stresses across the ligament. The size effect measurements also yield an estimate of the size of the fracture process zone, which is found to be nearly the same as for Mode I fracture.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-10T12:01:33Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-10T12:01:33Z (GMT). No. of bitstreams: 0
Published
N/A
en
Antiplane Shear Fracture Tests (Mode III)
Article
SOE
199890270
N/A
Civil Engineering
Materials Journal
87
1
12-19
Concretes
Cracking (fracturing)
Dimensional analysis
Energy
Measurement
Mortars (material)
Shear tests
Specimens
Tensile stresses
Tests
Materials Research
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3038/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3038
oai:laur.lau.edu.lb:10725/3038
2016-08-08 13:42:16.181
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30392016-08-24T08:07:06Zcom_10725_2055col_10725_2075
Gomez, Francisco
Karam, Gebran
Khawlie, Mohamad
McClusky, Simon
Vernant, Philippe
Reilinger, Robert
Jaafar, Rani
Tabet, Charles
Khair, Kamal
2016-02-11T07:10:38Z
2016-02-11T07:10:38Z
2007
2016-02-11
0956-540X
http://hdl.handle.net/10725/3039
http://dx.doi.org/ 10.1111/j.1365-246X.2006.03328.x
Gomez, F., Karam, G., Khawlie, M., McClusky, S., Vernant, P., Reilinger, R., ... & Barazangi, M. (2007). Global Positioning System measurements of strain accumulation and slip transfer through the restraining bend along the Dead Sea fault system in Lebanon. Geophysical Journal International, 168(3), 1021-1028.
http://gji.oxfordjournals.org/content/168/3/1021.short
Approximately 4 yr of campaign and continuous Global Positioning System (GPS) measurements across the Dead Sea fault system (DSFS) in Lebanon provide direct measurements of interseismic strain accumulation along a 200‐km‐long restraining bend in this continental transform fault. Late Cenozoic transpression within this restraining bend has maintained more than 3000 m of topography in the Mount Lebanon and Anti‐Lebanon ranges. The GPS velocity field indicates 4–5 mm yr−1 of relative plate motion is transferred through the restraining bend to the northern continuation of the DSFS in northwestern Syria. Near‐field GPS velocities are generally parallel to the major, left‐lateral strike‐slip faults, suggesting that much of the expected convergence across the restraining bend is likely accommodated by different structures beyond the aperture of the GPS network (e.g. offshore Lebanon and, possibly, the Palmyride fold belt in SW Syria). Hence, these geodetic results suggest a partitioning of crustal deformation involving strike‐slip displacements in the interior of the restraining bend, and crustal shortening in the outer part of the restraining bend. Within the uncertainties, the GPS‐based rates of fault slip compare well with Holocene‐averaged estimates of slip along the two principal strike‐slip faults: the Yammouneh and Serghaya faults. Of these two faults, more slip occurs on the Yammouneh fault, which constitutes the primary plate boundary structure between the Arabia and Sinai plates. Hence, the Yammouneh fault is the structural linkage that transfers slip to the northern part of the transform in northwestern Syria. From the perspective of the regional earthquake hazard, the Yammouneh fault is presently locked and accumulating interseismic strain.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-11T07:10:38Z
No. of bitstreams: 1
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Published
N/A
en
Global Positioning System measurements of strain accumulation and slip transfer through the restraining bend along the Dead Sea fault system in Lebanon
Article
SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
Geophysical Journal International
168
3
1021-1028
Crustal deformation
Dead Sea fault system
Fault motion
Global Positioning System (GPS)
Neotectonics
Transform faults
ORIGINAL
Global.pdf
Global.pdf
application/pdf
13921372
https://laur.lau.edu.lb:8443/bitstream/10725/3039/1/Global.pdf
bf436227fb3a0bcf277783da30098fb9
MD5
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LICENSE
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license.txt
text/plain; charset=utf-8
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8a4605be74aa9ea9d79846c1fba20a33
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10725/3039
oai:laur.lau.edu.lb:10725/3039
2016-08-24 11:07:06.008
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30412016-08-24T09:34:04Zcom_10725_2055col_10725_2075
Karam, Gebran
2016-02-11T07:55:34Z
2016-02-11T07:55:34Z
1994
2016-02-11
0308-0161
http://hdl.handle.net/10725/3041
http://dx.doi.org/10.1016/0308-0161(94)90077-9
Karam, G. N. (1994). On the ovalisation in bending of nylon and plastic tubes. International journal of pressure vessels and piping, 58(2), 147-149.
http://www.sciencedirect.com/science/article/pii/0308016194900779
An untruncated form of the Brazier analysis is used to model the ovalisation of plastic tubes in bending over a wide range of ovalisation values. A relationship between the different geometric parameters of the problem is obtained independently of the materials modulus. Theoretical predictions are compared with some recently reported data showing good agreement.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-11T07:55:34Z
No. of bitstreams: 0
Made available in DSpace on 2016-02-11T07:55:34Z (GMT). No. of bitstreams: 0
Published
N/A
en
On the ovalisation in bending of Nylon and plastic tubes
Article
SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
International Journal of Pressure Vessels and Piping
58
2
147-149
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3041/1/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3041
2016-08-24 12:34:04.409
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30422019-01-14T11:14:42Zcom_10725_2055col_10725_2075
Karam, Gebran
2016-02-11T08:05:20Z
2016-02-11T08:05:20Z
2005
2016-02-11
0305-7364
http://hdl.handle.net/10725/3042
http://dx.doi.org/ 10.1093/aob/mci130
Karam, G. N. (2005). Biomechanical model of the xylem vessels in vascular plants. Annals of botany, 95(7), 1179-1186.
http://aob.oxfordjournals.org/content/95/7/1179.short
• Background and Aims The xylem, or water transport system, in vascular plants adopts different morphologies that appear sequentially during growth phases. This paper proposes an explanation of these morphologies based on engineering design principles.
• Methods Using microscopic observations of the different growth stages, an engineering analysis of the xylem vessels as a closed cylinder under internal pressure is carried out adopting pressure vessel design concepts.
• Key Results The analysis suggests that the xylem vessel structural morphology follows the ‘constant strength’ design principle, i.e. all of the material within the wall of the xylem is loaded equally to its maximum allowable stress capacity, and the amount of material used is therefore systematically minimized. The analysis shows that the different structural designs of the xylem vessel walls (annular, helical, reticulate and pitted) all quantitatively follow the constant strength design principle.
• Conclusions The results are discussed with respect to growth and differentiation. It is concluded that the morphology of the xylem vessel through the different phases of growth seems to follow optimal engineering design principles
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-11T08:05:20Z
No. of bitstreams: 1
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Published
N/A
en
Biomechanical Model of the Xylem Vessels in Vascular Plants
Article
SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
Annals of Botany
95
7
1179-1186
Xylem vessel
Vascular plant
Constant strength
Structural design
Xylem cell wall
Biomechanics
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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2019-01-14 13:14:42.342
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oai:laur.lau.edu.lb:10725/30432016-08-25T08:12:22Zcom_10725_2055col_10725_2075
Karam, Gebran
2016-02-11T08:10:22Z
2016-02-11T08:10:22Z
2006
2016-02-11
1443-1475
http://hdl.handle.net/10725/3043
Karam, G. (2006). Vocational and Technical Education in Lebanon: Strategic Issues and Challenges. International Education Journal, 7(3), 259-272.
http://eric.ed.gov/?id=EJ847310
The current status of the Lebanese vocational and technical education (VTE) system is assessed and the strategic issues and challenges facing it are identified. In addition to the economic and social challenges that are common to many developing countries, the Lebanese system suffers from idiosyncratic problems, which may require innovative and bold reform strategies. The results of the first open consultations in the history of VTE with public and private sector stakeholders and key decision makers are analysed. These results are used to confirm the analysis of the current situation and to chart a strategic planning process for policy making, reform, and improved effectiveness in Lebanese vocational and technical education. (Contains 6 tables, 1 figure, and 1 footnote.)
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Vocational and Technical Education in Lebanon
Strategic Issues and Challenges
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SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
International Education Journal
7
3
259-272
ORIGINAL
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oai:laur.lau.edu.lb:10725/30442018-01-30T09:03:05Zcom_10725_2055col_10725_2075
Karam, Gebran
2016-02-11T08:17:44Z
2016-02-11T08:17:44Z
1992
2016-02-11
0315-1468
http://hdl.handle.net/10725/3044
Karam, G. N. (1992). Discussion: Strength tests on slender plain block masonry walls with veneer wythes. Canadian Journal of Civil Engineering, 19(6), 1082-1083.
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Published
N/A
en
Discussion: Strength tests on slender plain block masonry walls with veneer wythes
Article
SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
Canadian Journal of Civil Engineering
19
6
1082-1083
LICENSE
license.txt
license.txt
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oai:laur.lau.edu.lb:10725/30452019-01-14T11:09:45Zcom_10725_2055col_10725_2075
Karam, Gebran
2016-02-11T08:28:17Z
2016-02-11T08:28:17Z
1993
2016-02-11
0899-1561
http://hdl.handle.net/10725/3045
http://dx.doi.org/10.1061/(ASCE)0899-1561(1993)5:4(547)
Karam, G. N. (1993). Discussion of “Modeling Stiffness Degradation in Filamentary Composite Materials” by Robert M. Hackett and Kerry T. Slattery (May, 1992, Vol. 4, No. 2). Journal of materials in civil engineering, 5(4), 547-549.
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en
Discussion of “Modeling Stiffness Degradation in Filamentary Composite Materials” by Robert M. Hackett and Kerry T. Slattery
Article
SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
Journal of Materials in Civil Engineering
5
4
547-549
LICENSE
license.txt
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oai:laur.lau.edu.lb:10725/30462019-01-14T11:03:15Zcom_10725_2055col_10725_2075
Karam, Gebran
2016-02-11T08:39:00Z
2016-02-11T08:39:00Z
1993
2016-02-11
0899-1561
http://hdl.handle.net/10725/3046
http://dx.doi.org/10.1061/(ASCE)0899-1561(1993)5:3(420)
Karam, G. N. (1993). Discussion of “Predictions of Thermal Characteristics for Mixed Porous Media” by Yueying Deng, Clifford B. Fedler, and James M. Gregory (May, 1992, Vol. 4, No. 2). Journal of Materials in Civil Engineering, 5(3), 420-421.
http://ascelibrary.org/doi/abs/10.1061/(ASCE)0899-1561(1993)5:3(420)
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Published
N/A
en
Discussion of “Predictions of Thermal Characteristics for Mixed Porous Media” by Yueying Deng, Clifford B. Fedler, and James M. Gregory
Article
SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
Journal of Materials in Civil Engineering
5
3
420-421
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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2019-01-14 13:03:15.637
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oai:laur.lau.edu.lb:10725/30472019-01-14T11:03:48Zcom_10725_2055col_10725_2075
Karam, Gebran
2016-02-11T08:52:15Z
2016-02-11T08:52:15Z
1993
2016-02-11
0899-1561
http://hdl.handle.net/10725/3047
Karam, G. N. (1993). Discussion of “Compressive Behavior of Glass-Fiber-Reinforced Polymer Concrete” by S. Mebarkia and C. Vipulanandan (February, 1992, Vol. 4, No. 1). Journal of Materials in Civil Engineering, 5(1), 146-148.
http://ascelibrary.org/doi/pdf/10.1061/(ASCE)0899-1561(1993)5%3A1(146)
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Published
N/A
en
Discussion of “Compressive Behavior of Glass-Fiber-Reinforced Polymer Concrete” by S. Mebarkia and C. Vipulanandan
Article
SOE
199590200
N/A
Civil Engineering
gkaram@lau.edu.lb
Journal of Materials in Civil Engineering
4
1
146-148
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3047/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3047
2019-01-14 13:03:48.263
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oai:laur.lau.edu.lb:10725/30492021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Awwad, Rita E.
Ioannou, Photios G.
2016-02-12T08:33:46Z
2016-02-12T08:33:46Z
2010
2017-04-11
0733-9364
http://hdl.handle.net/10725/3049
http://dx.doi.org/10.1061/ ASCECO.1943-7862.0000202
Ioannou, P. G., & Awwad, R. E. (2010). Below-average bidding method. Journal of Construction Engineering and Management, 136(9), 936-946.
http://ascelibrary.org/doi/abs/10.1061/(ASCE)CO.1943-7862.0000202
The low-bid method, typically used for competitive bidding in the United States, may result in a contract with a firm that
submits either accidentally or deliberately an unrealistically low-bid price. Such an occurrence hurts both the owner and the contractor by
promoting disputes, increased costs, and schedule delays. To address this problem, other countries have adopted bidding methods based
on the average of the bids submitted. One such approach is the below-average method where the winning bid is closest to but below the
average of all bids. A competitive bidding model for the below-average-bid method is presented and its merits relative to the average-bid
method and the low-bid method are explored. The below-average-bid process is investigated analytically and through Monte Carlo
simulation. The results of bidding models for the below-average, the average, and the low-bid methods are presented in four easy-to-use
nomograms which allow contractors to determine the optimal lump-sum bid price for each method without the need for complicated
analysis. A comparison of the three methods provides information and insights to help owners with the difficult choice of a suitable
bidding method for the project at hand
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-12T08:33:46Z
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Published
N/A
en
Below-Average Bidding Method
Article
SOE
199906210
N/A
Civil Engineering
rita.awwad@lau.edu.lb
Journal of Construction Engineering and Management
136
9
936-946
Construction
Contracts
Bids
Pricing
Competition
Model
Simulation
Average Bid
Below-average-bid
Low bid
Markup
Contingency
Probability
Innovation
Taiwan
Italy
Peru
Florida
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3049/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/3049
2021-03-19 11:59:50.538
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30642021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T07:03:45Z
2016-02-15T07:03:45Z
2015
2017-04-11
1536-1276
http://hdl.handle.net/10725/3064
http://dx.doi.org/10.1109/TWC.2015.2440270
Abou-Rjeily, C. (2015). Unitary space-time pulse position modulation for differential unipolar MIMO IR-UWB communications. IEEE Transactions on Wireless Communications, 14(10), 5602-5615.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7116600&tag=1
In this paper, we present a general technique for constructing minimal-delay unitary differential Space-Time (ST) block codes for Pulse Position Modulation (PPM) with an arbitrary number of transmit antennas and signal set cardinality. A typical application corresponds to Multiple Input Multiple Output (MIMO) Impulse-Radio Ultra-Wideband (IR-UWB) systems where neither the transmitter nor the receiver knows the channel. The proposed scheme is a pulse-based solution where the information is encoded differentially through the relative shifts of the pulses in one block with respect to the pulse positions in the previous block where each block extends over P symbol durations with P standing for the number of transmit antennas. This technique of time-domain encoding avoids all types of amplitude constellation expansions and achieves a full transmit diversity order while maintaining a single unipolar pulse transmission per symbol in a way that is completely equivalent to single-antenna PPM communications. We also propose a simplified decoder that can be associated with the proposed ST code and we perform a detailed complexity analysis that allows to quantify the reduction in the number of operations offered by this simplified decoding strategy. Finally, the results are validated numerically and through a semi-analytical evaluation of the conditional symbol error rate.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T07:03:45Z
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Published
N/A
en
Unitary space-time pulse position modulation for differential unipolar MIMO IR-UWB communications
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Wireless Communications
14
10
5602-5615
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3064/2/license.txt
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Post-print (Unitary).pdf
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2021-03-19 11:59:50.553
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30652021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T07:12:11Z
2016-02-15T07:12:11Z
2017-10-12
0733-8716
http://hdl.handle.net/10725/3065
http://dx.doi.org/10.1109/JSAC.2015.2432526
Abou-Rjeily, C. (2015). Performance analysis of FSO communications with diversity methods: Add more relays or more apertures?. IEEE Journal on Selected Areas in Communications, 33(9), 1890-1902.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7106570
This paper targets the performance analysis of multiple-input-multiple-output (MIMO) point-to-point single-aperture relay-assisted and MIMO relay-assisted free-space optical (FSO) communications. The objective of the paper is to compare the different FSO diversity methods via an outage probability analysis over gamma-gamma turbulence channels in the case of independent fading among the different apertures of the communicating nodes. Through a well-tailored calculation method, we approximate the gamma-gamma distribution and the gamma-gamma sum-distribution by appropriate gamma distributions. This method resulted in simple closed-form outage probability expressions that are accurate for average-to-large values of the signal-to-noise ratio (SNR) and in asymptotic expressions that are useful for evaluating the diversity gains and coding gains. In particular, we derived the diversity gains of MIMO repetition coding (RC), MIMO transmit laser selection (TLS), MIMO all-active relaying (AR) and MIMO selective-relaying (SR). We prove that MIMO-RC and MIMO-TLS, on one hand, and MIMO-AR and MIMO-SR, on the second hand, achieve the same diversity gain and we evaluate the coding gain of TLS with respect to RC and of SR with respect to AR. By comparing the MIMO and cooperative methods with point receivers, we reach the central result that it is always better, from a diversity gain point of view, to add more apertures to the source and destination rather than adding more relays in their vicinity despite the fact that the fading variance along FSO links decreases with the distance. For receivers that implement aperture averaging, we derive conditions under which MIMO techniques are unconditionally better than cooperative techniques with any network topology.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T07:12:11Z
No. of bitstreams: 1
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Performance.pdf: 1649968 bytes, checksum: c8351547ef567256a0191605faca189e (MD5)
Published
N/A
en
Performance Analysis of FSO Communications With Diversity Methods
Add More Relays or More Apertures?
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Journal on Selected Areas in Communications
33
9
1890-1902
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3065/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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ORIGINAL
Post-print (Performance).pdf
Post-print (Performance).pdf
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oai:laur.lau.edu.lb:10725/3065
2021-03-19 11:59:50.574
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30662021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T07:22:42Z
2016-02-15T07:22:42Z
2015
2017-10-12
1536-1276
http://hdl.handle.net/10725/3066
http://dx.doi.org/10.1109/TWC.2014.2381264
Abou-Rjeily, C. (2014). Distributed space-time codes for full-duplex IR-UWB amplify-and-forward cooperation. IEEE Transactions on Wireless Communications, 14(4), 2144-2155.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6985665
In this paper, we consider the problem of full-duplex (FD) relaying in the context of impulse-radio ultra-wideband (IR-UWB) communications. In particular, we propose two novel distributed space-time block codes (STBCs) suitable for the amplify-and-forward (AF) cooperation protocol with one and two relays. Despite the fact that FD relaying results in significant levels of interference between the transmit and receive antennas of each relay, it introduces new concepts to the problem of distributed STBC design. Compared to half-duplex (HD) STBC, FD-STBC is subject to an additional constraint that imposes the structure of the codewords while it offers the predominant advantage that resides in the possibility of including a smaller number of information symbols per codeword for achieving a full rate. We take advantage of this potential for constructing fully-diverse, full-rate and totally-real IR-UWB FD-STBCs that outperform the existing HD-STBCs for all practical levels of the residual self loop interference. In fact, for the sake of transmitting at full rate, the best known distributed HD-STBCs for the non-orthogonal AF protocol require the joint encoding/decoding of $4N_{r}$ symbols where $N_{r} $ is the number of relays. On the other hand, the proposed FD-STBCs require embedding only $N_{r} +2$ symbols per codeword for transmitting at full rate. Following from this fact, not only the decoding complexity is reduced, but also the coding gains are improved resulting in enhanced performance levels.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T07:22:42Z
No. of bitstreams: 1
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Published
N/A
en
Distributed space-time codes for full-duplex IR-UWB amplify-and-forward cooperation
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Wireless Communications
14
4
2144-2155
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3066/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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ORIGINAL
Post-print (Distributed).pdf
Post-print (Distributed).pdf
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oai:laur.lau.edu.lb:10725/30672021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Abdo, Alfred
2016-02-15T07:34:07Z
2016-02-15T07:34:07Z
2015
2018-05-18
1089-7798
http://hdl.handle.net/10725/3067
http://dx.doi.org/10.1109/LCOMM.2015.2401563
Abou-Rjeily, C., & Abdo, A. (2015). Serial relaying over Gamma-Gamma MIMO FSO links: Diversity order and aperture allocation. IEEE Communications Letters, 19(4), 553-556.
http://ieeexplore.ieee.org/document/7036051/?arnumber=7036051
Serial relaying is analyzed in the context where the Free-Space Optical (FSO) communicating nodes are equipped with multiple apertures. We derive asymptotic expressions for the outage probability over the gamma-gamma fading channel and we evaluate the diversity orders that can be achieved by combining the multi-hop and multi-aperture techniques. A recursive algorithm that optimally allocates the apertures to the hops is also proposed. Results highlight the importance of aperture allocation for multi-hop-multi-aperture systems where significant performance improvements can be gained.
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Published
N/A
en
Serial Relaying Over Gamma-Gamma MIMO FSO Links
Diversity Order and Aperture Allocation
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Communications Letters
19
4
553-556
LICENSE
license.txt
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oai:laur.lau.edu.lb:10725/30682019-09-27T09:41:46Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Haddad, Serj
2016-02-15T07:42:44Z
2016-02-15T07:42:44Z
2016-02-15
0090-6778
http://hdl.handle.net/10725/3068
http://dx.doi.org/10.1109/TCOMM.2014.2316262
Abou-Rjeily, C., & Haddad, S. (2014). Inter-relay cooperation: A new paradigm for enhanced relay-assisted FSO communications. IEEE Transactions on Communications, 62(6), 1970-1982.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6355001
In this paper, we study the effect of the presence of inter-relay connections on the performance of cooperative free-space optical (FSO) networks. Unlike the existing literature where conventional cooperation in FSO systems is realized in two steps through source-relay (S-R) followed by relay-destination (R-D) communications, we propose and analyze a novel three-stage cooperation methodology. The proposed scheme is based on exploiting the potential presence of FSO links between neighboring relays for the sake of complementing the S-R and R-D steps with an intermediate inter-relay communication step that serves in enhancing the fidelity of signal reconstruction at the relays before retransmitting to the destination. For the proposed scheme, we derive closed-form expressions for the conditional error probability with any number of relays. We also propose a closed-form power allocation strategy (PAS) in the case where the background noise is negligible. This PAS is based on minimizing an asymptotic upper-bound on the conditional error probability by applying the method of Lagrange multipliers with the solution satisfying the Karush-Kuhn-Tucker (KKT) conditions. Results show that the presence of inter-relay connections, associated with an appropriate cooperation scheme and PAS, can significantly boost the performance of relay-assisted FSO systems.
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Published
N/A
en
Inter-relay cooperation
a new paradigm for enhanced relay-assisted FSO communications
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
62
6
1970-1982
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3068/2/license.txt
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oai:laur.lau.edu.lb:10725/30692019-09-27T10:23:41Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T08:00:40Z
2016-02-15T08:00:40Z
2016-02-15
0733-8724
http://hdl.handle.net/10725/3069
http://dx.doi.org/10.1109/JLT.2014.2315853
Abou-Rjeily, C. (2014). All-active and selective FSO relaying: Do we need inter-relay cooperation? Journal of Lightwave Technology, 32(10), 1899-1906.
https://laur.lau.edu.lb:8443/xmlui/handle/10725/3069
In this paper, we study the impact of inter-relay cooperation on the outage performance of relay-assisted free-space optical (FSO) systems with two relays. Despite the fact that in realistic networks a FSO link might be available between the deployed relays, the additional advantages of exploiting such link were never investigated before. We explore this new dimension under the two strategies where either all relays are active or a single relay is selected. We evaluate the achievable diversity orders over gamma-gamma channels and we derive conditions under which inter-relay cooperation is advantageous. We study two variants of inter-relay cooperation; namely, one-way and two-way cooperation. We prove that based on the network structure, one of these variants, both or neither may be beneficial.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T08:00:40Z
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Published
N/A
en
All-active and selective FSO relaying
do we need inter-relay cooperation?
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
Journal of Lightware Technology
32
10
1899-1906
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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oai:laur.lau.edu.lb:10725/30702019-09-27T11:11:42Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T08:13:43Z
2016-02-15T08:13:43Z
2013
2016-02-15
0090-6778
http://hdl.handle.net/10725/3070
http://dx.doi.org/10.1109/TCOMM.2013.071813.120439
Abou-Rjeily, C. (2013). Achievable diversity orders of decode-and-forward cooperative protocols over gamma-gamma fading FSO links. IEEE Transactions on Communications, 61(9), 3919-3930.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6567874
In this paper, we consider the problem of relay-assisted free-space optical (FSO) transmissions with any number of relays. At a first time, we consider the quantum limited scenario and analyze the simple Decode-and-Forward (SDF) protocol where all symbols received at a certain relay are retransmitted to the destination. We also propose a novel Selective-DF (SelDF) protocol that can be implemented without requiring any kind of channel state information (CSI) neither at the transmitter nor at the receiver sides. We derive the diversity orders that can be achieved by SDF and SelDF over gamma-gamma fading channels and highlight the superiority of SelDF. We also prove that for some network configurations, SDF might achieve the same diversity order as SelDF. On the other hand, for most of the network configurations, the SDF protocol, that was studied extensively in the context of N_r-relays radio-frequency (RF) systems and one-relay FSO systems, is not suitable for FSO systems with more than one relay since it results in reduced diversity orders. At a second time, the above protocols are extended to FSO systems that are corrupted by background radiation. For SelDF, we propose a novel metric that captures the fidelity with which a certain message is detected at the relay thus determining whether this relay will participate in the cooperation effort or not.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T08:13:43Z
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Published
N/A
en
Achievable diversity orders of decode-and-forward cooperative protocols over gamma-gamma fading FSO links
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
61
9
3913-3930
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3070/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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ORIGINAL
Post-print (Achievable).pdf
Post-print (Achievable).pdf
application/pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/3070/3/Post-print+%28Achievable%29.pdf
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2019-09-27 14:11:42.387
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30712019-09-27T12:15:57Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T08:26:03Z
2016-02-15T08:26:03Z
2013
2016-02-15
0733-8724
http://hdl.handle.net/10725/3071
Abou-Rjeily, C. (2013). Performance analysis of selective relaying in cooperative free-space optical systems. Journal of Lightwave Technology, 31(18), 2965-2973.
https://www.osapublishing.org/jlt/abstract.cfm?uri=jlt-31-18-2965
In this paper, we evaluate the performance of a selective-relaying (SR) protocol that is suitable for cooperative free-space optical (FSO) communications with any number of relays. The SR strategy is based on transmitting all information symbols either along the direct link between the source and the destination or along one of the indirect links via the relays. We derive closed-form expressions of upper-bounds on the average error probability that can be achieved over Rayleigh and lognormal fading channels. We also provide an asymptotic analysis for quantifying the diversity gain and reduction in fading variance that can be realized by the cooperative scheme. The performance analysis shows the superiority of the SR scheme over the strategy that corresponds to activating all available links.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T08:26:03Z
No. of bitstreams: 1
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Published
N/A
en
Performance Analysis of Selective Relaying in Cooperative Free-Space Optical Systems
Article
SOE
200701131
N/A
Electrical Engineering
Journal of Lightwave Technology
31
18
2965-2973
Cooperation
Free-space opticcal (FSO)
Relaying
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3071/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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ORIGINAL
Post-print (Performance).pdf
Post-print (Performance).pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/3071/3/Post-print+%28Performance%29.pdf
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10725/3071
oai:laur.lau.edu.lb:10725/3071
2019-09-27 15:15:57.034
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30722019-09-27T12:31:01Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T08:32:21Z
2016-02-15T08:32:21Z
2013
2016-02-15
0733-8716
http://hdl.handle.net/10725/3072
http://dx.doi.org/10.1109/JSAC.2013.130808
Abou-Rjeily, C. (2012). A symbol-by-symbol cooperative diversity scheme for relay-assisted UWB communications with PPM. IEEE Journal on Selected Areas in Communications, 31(8), 1436-1445.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6338374
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In this paper, we propose a novel cooperation strategy for coherent Impulse-Radio Ultra-Wideband (IR-UWB) communication systems with one relay. While non-orthogonal cooperation in narrow-band wireless networks often requires deploying distributed space-time codes with joint encoding of several symbols at the source and relays and joint decoding of these symbols at the destination, the proposed non-orthogonal cooperation scheme constitutes the first known symbol-by-symbol-based scheme where cooperation is entirely realized within one symbol duration. This follows from the fact that the proposed strategy is adapted to the structure of the Pulse Position Modulation (PPM) that constitutes the most popular modulation scheme associated with UWB transmissions. We also propose a simple and efficient power allocation strategy that further boosts the performance of the proposed cooperation strategy. The error performance of the proposed scheme is evaluated analytically while simulations performed over the IEEE 802.15.3a UWB channel model are provided to support the theoretical results.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T08:32:21Z
No. of bitstreams: 1
A symbol.pdf: 473989 bytes, checksum: da9e421b607b499460bf7cb5e9cdbb53 (MD5)
Made available in DSpace on 2016-02-15T08:32:21Z (GMT). No. of bitstreams: 1
A symbol.pdf: 473989 bytes, checksum: da9e421b607b499460bf7cb5e9cdbb53 (MD5)
Published
N/A
en
A Symbol-by-Symbol Cooperative Diversity Scheme for Relay-Assisted UWB Communications with PPM
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Journal on selected areas in communications
31
8
1436-1445
Ultra-wideband, UWB, PPM, Cooperation, Relay,
Diversity, Power allocation, Decode-and-forward, DF, Performance analysis, Cooperative diversity, Correlated noise
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3072/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
2
ORIGINAL
Post-print (A symbol).pdf
Post-print (A symbol).pdf
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426255
https://laur.lau.edu.lb:8443/bitstream/10725/3072/3/Post-print+%28A+symbol%29.pdf
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oai:laur.lau.edu.lb:10725/3072
2019-09-27 15:31:01.268
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30732019-09-27T12:41:42Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T08:42:39Z
2016-02-15T08:42:39Z
2012
2016-02-15
1089-7798
http://hdl.handle.net/10725/3073
http://dx.doi.org/10.1109/LCOMM.2012.111412.121903
Abou-Rjeily, C. (2012). Power allocation for quantum-limited multihop free-space optical communication systems. IEEE Communications Letters, 16(12), 2068-2071.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6355001
In this paper, we propose two novel power allocation strategies for multihop Free-Space Optical (FSO) networks with any number of hops. These strategies correspond to the analytical solutions obtained from minimizing two different upper-bounds on the conditional error probability under the quantum-limit scenario. The performance of the first strategy is evaluated numerically and closed-form expressions of the average probability of error are derived for the second strategy. We also quantify the reduction in the fading variance and scintillation index provided by multihop FSO systems associated with the second power allocation scheme that compromises performance for simplicity. Results show the superiority of the proposed schemes compared to the equal power distribution strategy.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T08:42:39Z
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Published
N/A
en
Power Allocation for Quantum-Limited Multihop Free-Space Optical Communication Systems
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Communications Letters
16
12
2068-2071
Free-space optics
FSO
Cooperation
Relaying
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3073/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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Post-print (Power).pdf
Post-print (Power).pdf
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2019-09-27 15:41:42.289
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oai:laur.lau.edu.lb:10725/30742019-09-30T06:54:35Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T08:57:13Z
2016-02-15T08:57:13Z
2011
2016-02-15
0090-6778
http://hdl.handle.net/10725/3074
http://dx.doi.org/10.1109/TCOMM.2011.062111.100061
Abou-Rjeily, C. (2011). Performance analysis of UWB systems over the IEEE 802.15. 3a channel model. IEEE Transactions on Communications, 59(9), 2377-2382.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5934677
In this paper, we propose an accurate method for evaluating the performance of Ultra-Wideband systems over the IEEE 802.15.3a channel model. Depending on the severeness of fading, the method consists of approximating the distribution of the captured channel energy by either a Coxian, gamma-mixture or lognormal distribution based on a least square fitting criterion. The proposed approximations lend themselves to simple mathematical analysis and turn out to be useful in evaluating the performance, in terms of average bit-error-rate (BER) and outage probability, over the IEEE 802.15.3a channels.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T08:57:13Z
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Published
N/A
en
Performance Analysis of UWB Systems over the IEEE 802.15.3a Channel Model
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
59
9
2377-2382
Ultra-Wideband
UWB
EEE 802.15.3a
Performance analysis
Inter-Pulse-Interference
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3074/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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Post-print (Performance).pdf
Post-print (Performance).pdf
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oai:laur.lau.edu.lb:10725/3074
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oai:laur.lau.edu.lb:10725/30752019-09-30T08:20:36Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T09:16:52Z
2016-02-15T09:16:52Z
2011
2016-02-15
1536-1276
http://hdl.handle.net/10725/3075
http://dx.doi.org/10.1109/TWC.2011.060711.101038
Abou-Rjeily, C. (2011). A 2x2 Shape-Preserving ST Code for UWB Communications with Multipulse PPM. IEEE Transactions on Wireless Communications, 10(8), 2402-2406.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5898371&tag=1
Print
Request Permissions
In this paper, we consider the application of Multipulse Pulse Position Modulation (MPPM) as a power-efficient modulation scheme for Impulse-Radio Ultra-Wideband (IR-UWB) communications and we propose the first known MPPM-specific 2×2 space-time code that is convenient for this modulation. The proposed rate-1 code achieves a full transmit diversity order with all MPPM constellations without introducing any constellation expansion. We also show that the proposed code profits from a low decoding complexity in the absence of interference between the different modulated UWB pulses.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T09:16:52Z
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Published
N/A
en
A 2x2 shape-preserving ST code for UWB communications with multipulse PPM
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Wireless Communications
10
8
2402 - 2406
Ultra-Wideband (UWB)
Space-Time (ST) codes
Multipulse Pulse Position Modulation (MPPM)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3075/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/30762019-09-30T08:53:26Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T09:23:02Z
2016-02-15T09:23:02Z
2011
2016-02-15
1089-7798
http://hdl.handle.net/10725/3076
http://dx.doi.org/10.1109/LCOMM.2011.041411.110312
Abou-Rjeily, C. (2011). On the optimality of the selection transmit diversity for MIMO-FSO links with feedback. IEEE Communications Letters, 15(6), 641-643.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5755147
We propose an optimal power allocation strategy for Multiple-Input-Multiple-Output (MIMO) Free-Space Optical (FSO) links with Intensity Modulation (IM) and Direct Detection (DD). The optimization is performed for shot noise limited systems in the presence of complete feedback. The derived analytical solution turns out to be the same as the selection transmit diversity scheme proposed for MISO-FSO systems corrupted by Gaussian noise. We also propose and analyze a novel transmission strategy for the limited-feedback case.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T09:23:02Z
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Published
N/A
en
On the Optimality of the Selection Transmit Diversity for MIMO-FSO Links with Feedback
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Communications Letters
15
6
641 - 643
Free-space optics
Transmit diversity
Power allocation
Atmosphere turbulemce
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3076/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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ORIGINAL
Post-print (On the optimality).pdf
Post-print (On the optimality).pdf
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oai:laur.lau.edu.lb:10725/30772019-09-30T09:04:46Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Haddad, Serj
2016-02-15T09:32:42Z
2016-02-15T09:32:42Z
2011
2016-02-15
0733-8724
http://hdl.handle.net/10725/3077
Abou-Rjeily, C., & Haddad, S. (2011). Cooperative FSO systems: Performance analysis and optimal power allocation. Journal of Lightwave Technology, 29(7), 1058-1065.
In this paper, we investigate the cooperative diversity technique as a candidate solution for combating turbulence-induced fading over free-space optical (FSO) links. In particular, we propose a novel cooperation strategy that is suitable for quantum-limited FSO systems with any number of relays and we derive closed-form expressions for the error performance of this strategy. In scenarios where the channel-state-information (CSI) is available at the different nodes, we propose an optimal power allocation strategy that satisfies the Karush-Kuhn-Tucker (KKT) conditions and that further boosts the performance of FSO networks. It turned out that this closed-form optimal solution corresponds to transmitting the entire optical power along the “strongest link” between the source and the destination nodes. A simple procedure is proposed for selecting this link and for distributing the power among its different hops.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-15T09:32:42Z
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Published
N/A
en
Cooperative FSO systems
performance analysis and optimal power allocation
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
Journal of Lightwave Technology
29
7
1058-1065
Atmospheric turbulence
Cooperative diversity
Free-space optics
Power allocation
Spatial diversity
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3077/2/license.txt
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oai:laur.lau.edu.lb:10725/30782019-09-30T09:42:52Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-15T09:46:03Z
2016-02-15T09:46:03Z
2011
2016-02-15
0090-6778
http://hdl.handle.net/10725/3078
http://dx.doi.org/10.1109/TCOMM.2011.121410.100032
Abou-Rjeily, C., & Haddad, S. (2011). Cooperative FSO systems: Performance analysis and optimal power allocation. Journal of Lightwave Technology, 29(7), 1058-1065.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5671563
In this paper, we investigate the cooperative diversity technique as a candidate solution for combating turbulence-induced fading over Free-Space Optical (FSO) links. In particular, a one-relay cooperative diversity scheme is proposed and analyzed for non-coherent FSO communications with intensity modulation and direct detection (IM/DD). The error performance is derived in semi-analytical and closed-form expressions in the presence and absence of background radiation, respectively. Results show the enhanced diversity orders that can be achieved over both Rayleigh and lognormal fading models.
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Published
N/A
en
Cooperative diversity for free-space optical communications
transceiver design and performance analysis
Article
Haddad, Serj
SOE
200701131
N/A
Civil Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
59
3
658-663
Free-space optics
Spatial diversity
Cooperative diversity
Atmospheric turbulence
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
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oai:laur.lau.edu.lb:10725/30792019-09-30T11:30:01Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Baba, Z,
2016-02-16T07:12:39Z
2016-02-16T07:12:39Z
2009
2016-02-16
0090-6778
http://hdl.handle.net/10725/3079
http://dx.doi.org/10.1109/TCOMM.2009.11.080060
Abou-Rjeily, C., & Baba, Z. (2009). Achieving full transmit diversity for PPM constellations with any number of antennas via double position and symbol permutations. IEEE Transactions on Communications, 57(11), 3235-3238.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5336843
We present a general technique for constructing minimal-delay rate-1 Space-Time (ST) block codes for Pulse Position Modulations (PPM) with an arbitrary number of transmit antennas. We show that the novel idea of time-domain constellation extension as well as introducing joint position and symbol permutations achieves a full transmit diversity order while maintaining unipolar transmissions. This renders the proposed scheme suitable for low-cost Time-Hopping Ultra- Wideband (TH-UWB) systems as well as Free-Space Optical (FSO) communications with direct detection.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T07:12:39Z
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Published
N/A
en
Achieving full transmit diversity for PPM constellations with any number of antennas via double position and symbol permutations
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
57
11
3235-3238
Space-time (ST) block code
PPM
Ultra-Wideband (UWB)
Unipolar transmission
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3079/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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ORIGINAL
Post-print (Achieving).pdf
Post-print (Achieving).pdf
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2019-09-30 14:30:01.484
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oai:laur.lau.edu.lb:10725/30802019-09-30T11:56:51Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Bkassiny, M.
2016-02-16T07:26:24Z
2016-02-16T07:26:24Z
2009
2016-02-16
1536-1276
http://hdl.handle.net/10725/3080
http://dx.doi.org/10.1109/TWC.2009.080684
Abou-Rjeily, C., & Bkassiny, M. (2009). Unipolar space-time codes with reduced decoding complexity for TH-UWB with PPM. IEEE Transactions on Wireless Communications, 8(10), 5086-5095.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5288944
In this paper, we consider the problem of space-time (ST) coding with unipolar pulse position modulations (PPM) and propose a novel ST code that satisfies a large number of construction constraints rendering it superior to the existing PPM encoding schemes. In particular, the proposed 2 times 2 code achieves a full transmit diversity order while transmitting at a rate of 1 PPM-symbol per channel use. The proposed scheme can be associated with M-ary PPM constellations for all even values of M without introducing any constellation expansion. This renders the proposed scheme suitable for low cost carrier-less ultra-wideband (UWB) systems where information must be conveyed only by the time delays of the modulated sub-nanosecond pulses without introducing any amplitude amplifications or phase rotations. Finally, the proposed scheme can be associated with a reduced complexity optimal maximum-likelihood (ML) decoder that takes the structure of the proposed code into consideration in order to simplify the decoding procedure. We also propose a simple diversity-preserving suboptimal decoder that requires approximately half the number of multiplications compared to the ML decoder. Possible extensions to transmitters equipped with three antennas are also discussed in situations where a certain number of feedback bits is available.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T07:26:24Z
No. of bitstreams: 1
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Published
N/A
en
Unipolar space-time codes with reduced decoding complexity for TH-UWB with PPM
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Wireless Communications
8
10
5086-5089
Time-hopping
Ultra-wideband (TH-UWB)
Space-time (ST)
Pulse position modulation (PPM)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3080/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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Post-print (Unipolar).pdf
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joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30812019-09-30T12:22:32Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-16T07:36:41Z
2016-02-16T07:36:41Z
2009
2016-02-16
0733-8716
http://hdl.handle.net/10725/3081
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5262289
http://dx.doi.org/10.1109/JSAC.2009.091003
Abou-Rjeily, C. (2009). Pulse antenna permutation and pulse antenna modulation: two novel diversity schemes for achieving very high data-rates with unipolar MIMO-UWB communications. IEEE Journal on selected areas in communications, 27(8), 1331-1340.
In this paper, we consider the problem of applying the Multiple-Input-Multiple-Output (MIMO) techniques on Impulse-Radio Time-Hopping Ultra-Wideband (IR-TH-UWB) communications. In particular, we propose two novel Space-Time (ST) block codes that are suitable for UWB. The proposed encoded MIMO-UWB schemes present the main advantage of conveying the information only through the positions of the very short unipolar UWB pulses. The constraint of unipolar transmissions keeps the transceiver structures very simple since it imposes no additional constraints on the RF circuitry to control the amplitudes or the phases of the sub-nanosecond UWB pulses. Consider the case where the transmitter is equipped with P antennas and where M PPM modulation positions are available. The first proposed scheme achieves a full transmit diversity order for M ges P while transmitting at the rate of log2(M) bits Per Channel Use (PCU). The second scheme is fully diverse with any number of antennas and transmits at a rate of M log2(P)/P bits PCU. The proposed codes permit to achieve different levels of compromise between complexity and performance since scheme 1 necessitates M-dimensional Maximum-Likelihood (ML) decoding while scheme 2 necessitates MP-dimensional decoding. We also present a comprehensive analysis on the enhancement in terms of the data rate achieved at a certain communication distance based on realistic indoor channel models and on an exact system model that takes inter-pulse-interference and intersymbol- interference into consideration.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T07:36:41Z
No. of bitstreams: 1
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Published
N/A
en
Pulse antenna permutation and pulse antenna modulation
Two novel diversity schemes for achieving very high data-rates with unipolar MIMO-UWB communications
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Journal on selected areas in communications
27
8
0733-8716
MIMO
Ultra-Wideband (UWB)
Space-Time (ST) coding
Pulse Position Modulation (PPM)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3081/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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ORIGINAL
Post-print (Pulse).pdf
Post-print (Pulse).pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/3081/3/Post-print+%28Pulse%29.pdf
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oai:laur.lau.edu.lb:10725/30822019-09-30T12:37:54Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
2016-02-16T07:43:14Z
2016-02-16T07:43:14Z
2009
2016-02-16
0090-6778
http://hdl.handle.net/10725/3082
http://dx.doi.org/10.1109/TCOMM.2009.03.070093
Abou-Rjeily, C. (2009). Orthogonal space-time block codes for binary pulse position modulation. IEEE transactions on communications, 57(3), 602-605.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4799031
In this paper, we propose orthogonal Space-Time (ST) codes for binary Pulse Position Modulations (PPM). Unlike the well known orthogonal ST codes, the proposed schemes verify the additional constraint of achieving a full transmit diversity order without introducing any phase rotations. This renders the proposed codes suitable for Free-Space Optical (FSO) communications with direct detection and for Ultra-WideBand (UWB) communications. At the receiver side, optimal detection can be achieved with linear operations and the proposed codes can be also applied with On-Off Keying (OOK).
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T07:43:14Z
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Published
N/A
en
Orthogonal space-time block codes for binary pulse position modulation
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
57
3
602-605
Free-Space Optical (FSO) communication
Ultra-WideBand (UWB)
Space-Time (ST) coding
PPM
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3082/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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ORIGINAL
Post-print (Orthogonal).pdf
Post-print (Orthogonal).pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/3082/3/Post-print+%28Orthogonal%29.pdf
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oai:laur.lau.edu.lb:10725/30832019-09-30T13:07:10Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Daniele, N.
Belfiore, J.-C.
2016-02-16T07:53:30Z
2016-02-16T07:53:30Z
2008
2016-02-16
0090-6778
http://hdl.handle.net/10725/3083
http://dx.doi.org/10.1109/TCOMM.2008.060071
Abou-Rjeily, C., Daniele, N., & Belfiore, J. C. (2008). On the amplify-and-forward cooperative diversity with time-hopping ultra-wideband communications. IEEE Transactions on Communications, 56(4), 630-641.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4489635
In this paper, we extend the Amplify-and-Forward cooperative diversity scheme to the context of impulse radio ultra wideband (IR-UWB). In particular, we present the construction of three families of minimal-delay and totally-real distributed algebraic space-time (ST) codes suitable for IR-UWB. The first family encodes adjacent symbols and is based on totally-real cyclic division algebras. The second family encodes the pulses used to transmit one information symbol and permits to achieve high performance levels with lower complexity. Both families of codes achieve full rate, full diversity with non-vanishing determinants for various number of relays. These schemes can be associated with pulse position modulation (PPM), pulse amplitude modulation (PAM) and hybrid pulse position and amplitude modulation (PPM-PAM). The third family of codes is information-lossless and does not require any pulse repetitions. It is specific to M-PPM-M'-PAM with M ges 3 and for all values of M'. Simulations performed over realistic indoor UWB channels are provided to verify the theoretical results.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T07:53:30Z
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Published
N/A
en
On the Amplify-and-Forward Cooperative Diversity with Time-Hopping Ultra-Wideband Communications
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
56
4
630-641
Time hopping ultra-wideband (TH-UWB)
Cooperative diversity
Space time (ST)
Pulse amplitude modulation (PAM)
pulse position modulation (PPM)
Rake
non-vanishing determinant (NVD)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3083/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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ORIGINAL
Post-print (On the amplify).pdf
Post-print (On the amplify).pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/3083/3/Post-print+%28On+the+amplify%29.pdf
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2019-09-30 16:07:10.376
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oai:laur.lau.edu.lb:10725/30842019-12-10T11:49:39Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Belfiore, Jean-Claude
2016-02-16T08:18:58Z
2016-02-16T08:18:58Z
2007
2016-02-16
0018-9448
http://hdl.handle.net/10725/3084
http://dx.doi.org/10.1109/TIT.2007.899472
Abou-Rjeily, C., & Belfiore, J. C. (2007). On space–time coding with pulse position and amplitude modulations for time-hopping ultra-wideband systems. IEEE transactions on information theory, 53(7), 2490-2509.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4252317
In this work, we propose novel families of space-time (ST) block codes that can be associated with impulse radio ultra-wideband (IR-UWB) communication systems. The carrier-less nature of this nonconventional totally real transmission technique necessitates the construction of new suitable coding schemes. In fact, the last generation of complex-valued ST codes (namely, the perfect codes) cannot be associated with IR-UWB systems where the phase reconstitution at the receiver side is practically infeasible. On the other hand, while the perfect codes were considered mainly with quadrature amplitude modulation (QAM) and hexagonal (HEX) constellations, IR-UWB systems are often associated with pulse-position modulation (PPM) and hybrid PPM-PAM (pulse-amplitude modulation) constellations. In this paper, instead of adopting the classical approach of constructing ST codes over infinite fields or for the perfect codes), we study the possibility of constructing modulation-specific codes that are exclusive to PPM and PPM-PAM. The proposed full-rate codes are totally real, information lossless, and have a uniform average energy per transmit antenna. They permit to achieve a full diversity order with any number of transmit antennas. In some situations, the proposed schemes have an optimal nonvanishing coding gain and satisfy all the construction constraints of the perfect codes in addition to the constraint of being totally real. Simulations performed over realistic indoor UWB channels showed that the proposed schemes outperform the best known codes constructed from cyclic division algebras.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T08:18:58Z
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Published
N/A
en
On Space–Time Coding With Pulse Position and Amplitude Modulations for Time-Hopping Ultra-Wideband Systems
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Information Theory
53
7
2490-2509
Modulation-specific codes
Multiple-input multiple-output (MIMO
Pulse-amplitude modulation (PAM)
PPAM
Pulse-position modulation (PPM)
Space–time (ST)
Ultra-wideband (UWB)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3084/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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Post-print (On space).pdf
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https://laur.lau.edu.lb:8443/bitstream/10725/3084/3/Post-print+%28On+space%29.pdf
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oai:laur.lau.edu.lb:10725/30852021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Belfiore, Jean.-Claude
2016-02-16T08:34:14Z
2016-02-16T08:34:14Z
2007
2016-04-11
1089-7798
http://hdl.handle.net/10725/3085
http://dx.doi.org/10.1109/LCOMM.2007.070047
Abou-Rjeily, C., & Belfiore, J. C. (2007). A space-time coded MIMO TH-UWB transceiver with binary pulse position modulation. IEEE Communications letters, 11(6), 522-524..
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4257452
In this paper, we propose a new multiple-input- multiple-output (MIMO) transceiver for time-hopping ultra- wideband (TH-UWB) communications. We consider the problem of space-time (ST) coding with binary pulse position modulation (PPM) and we propose the first known family of rate-1 ST codes that can be associated with binary PPM without introducing any additional constellation extension. We prove that the proposed encoding scheme can achieve a full transmit diversity order with 2k transmit antennas. At the receiver side, we propose a maximum-likelihood (ML) decoder that is adapted to the structure of the considered multi-dimensional constellation that does not have the structure of a lattice
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Published
N/A
en
A Space-Time Coded MIMO TH-UWB Transceiver with Binary Pulse Position Modulation
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Communications Letters
11
6
522-524
UWB
Space-time
MIMO
PPM
ML decoding
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3085/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/30862021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Daniele, Norbet
Belfiore, Jean-Claude
2016-02-16T08:44:07Z
2016-02-16T08:44:07Z
2006
2017-07-27
0090-6778
http://hdl.handle.net/10725/3086
http://dx.doi.org/10.1109/TCOMM.2006.884830
Abou-Rjeily, C., Daniele, N., & Belfiore, J. C. (2006). Space–time coding for multiuser ultra-wideband communications. IEEE Transactions on communications, 54(11), 1960-1972.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4012484
In this paper, we present the construction of full rate, fully diverse, and totally real space-time (ST) codes for ultra-wideband (UWB) transmissions. In particular, we construct two families of codes adapted to real carrierless UWB communications that employ pulse position modulation, pulse amplitude modulation, or a combination of the two. The first family encodes adjacent symbols and is constructed from totally real cyclic division algebras. The second family encodes the pulses used to convey one information symbol, and permits achieving high performance levels with reduced complexity. The first family of codes achieves only a fraction of the coding gain of the second one. Moreover, these coding gains are independent from the size of the transmitted constellation. For time-hopping multiple-access channels, the amplitude spreading code associated with the second family of codes is taken to be user-specific. In this case, a simple design criterion is proposed, and spreading matrices constructed according to this criterion permit reducing the level of multiple-access interference (MAI). Simulations performed over realistic indoor UWB channels verify the theoretical claims and show high performance levels and better immunity against MAI
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T08:44:07Z
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Published
N/A
en
Space–Time Coding for Multiuser Ultra-Wideband Communications
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Communications
54
11
1960-1972
Multiple-access interference (MAI)
Multipleinput multiple-output (MIMO)
pulse amplitude modulation (PAM)
Rake
Space-Time (ST) coding
Ultra-Wideband (UWB)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3086/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
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oai:laur.lau.edu.lb:10725/30872021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Daniele, N.
Belfiore, J.-C.
2016-02-16T08:52:29Z
2016-02-16T08:52:29Z
2006
2017-08-10
1089-7798
http://hdl.handle.net/10725/3087
http://dx.doi.org/10.1109/LCOMM.2006.1633325
Abou-Rjeily, C., Daniele, N., & Belfiore, J. C. (2006). A 2× 2 antennas ultra-wideband system with biorthogonal pulse position modulation. IEEE communications letters, 10(5), 366-368.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1633325&tag=1
The Golden code is a 2×2 space-time code that achieves the best known performance with all constellations carved from Z[i]. In this letter, we present the construction of a new coding scheme for 2M-ary biorthogonal pulse position modulations (BPPM) with M≥4. The proposed code satisfies all of the construction constraints of the Golden code and it has the additional advantage of being totally real making it suitable for low cost carrier-less ultra-wideband terminals. Namely, this totally real construction achieves full rate and full diversity with the best known coding gain and without any shaping losses for 2M-BPPM with M≥4.
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Published
N/A
en
A 2×2 antennas ultra-wideband system with biorthogonal pulse position modulation
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Communications Letters
10
5
366 - 368
UWB
Space-Time
MIMO
BPPM
PPM
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3087/2/license.txt
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oai:laur.lau.edu.lb:10725/30882021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Abou-Rjeily, Chadi
Daniele, Norbert
Belfiore, Jean-Claude
2016-02-16T08:59:29Z
2016-02-16T08:59:29Z
2007
2017-04-07
0929-6212
http://hdl.handle.net/10725/3088
http://dx.doi.org/10.1007/s11277-006-9237-0
Abou-Rjeily, C., Daniele, N., & Belfiore, J. C. (2007). Distributed Algebraic Space-Time Codes for Ultra-Wideband Communications. Wireless Personal Communications, 43(1), 107-121.
http://link.springer.com/article/10.1007/s11277-006-9237-0
In this paper, we extend the Amplify-and-Forward cooperative diversity scheme to the context of impulse radio ultra-wideband. In particular, we present the construction of two families of distributed algebraic space-time codes. The first family is based on totally real cyclic division algebras. The second family encodes the pulses used to transmit one information symbol and permits to achieve high-performance levels with lower complexity. Both families of codes achieve full rate, full diversity with non-vanishing determinants with various numbers of relays. Simulations performed over realistic indoor UWB channel models show important performance gains.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T08:59:29Z
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Published
N/A
en
Distributed algebraic space-time codes for ultra-wideband communications
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
Wireless personal communications
43
1
107-121
Time hopping ultra-wideband (TH-UWB)
Cooperative diversity
Space-Time (ST) coding
Pulse amplitude modulation (PAM)
Rake
Non-vanishing determinant (NVD)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3088/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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10725/3088
oai:laur.lau.edu.lb:10725/3088
2021-03-19 11:59:50.708
DSpace at LAU
joseph.sayah@lau.edu.lb
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oai:laur.lau.edu.lb:10725/30892021-03-19T09:59:50Zcom_10725_2055col_10725_2075
Keignart, Julien
Abou-Rjeily, Chadi
Delaveaud, Christophe
Daniele, Norbert
2016-02-16T09:09:02Z
2016-02-16T09:09:02Z
2006
2017-04-26
0018-9480
http://hdl.handle.net/10725/3089
http://dx.doi.org/10.1109/TMTT.2006.872080
Keignart, J., Abou-Rjeily, C., Delaveaud, C., & Daniele, N. (2006). UWB SIMO channel measurements and simulations. Microwave Theory and Techniques, IEEE Transactions on, 54(4), 1812-1819.
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1618610
Ultra-wideband (UWB) technology has recently attracted the entire wireless community with its great potential for short-range and high data-rate communications. On the other hand, multiantenna (or multiple-input multiple-output) techniques are considered as an effective way to improve the link reliability and transmission rate. In this paper, both aspects are studied through a complete UWB single-input multiple-output (SIMO) channel sounding campaign. The time-domain channel sounder with its antenna array is firstly detailed. Secondly, measurement results will be used to describe interesting antenna array effects and channel behavior (like correlation results and underlying spatial diversity). Finally, in order to show the utility of spatial diversity in UWB systems, the performance of a SIMO system with a Rake receiver will be presented through bit error rate simulations based on measurement results.
Submitted by Rola Habre (rola.habre@lau.edu.lb) on 2016-02-16T09:09:02Z
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Published
N/A
en
UWB SIMO channel measurements and simulations
Article
SOE
200701131
N/A
Electrical Engineering
chadi.abourjeily@lau.edu.lb
IEEE Transactions on Microwave Theory and Techniques
54
4
1812-1819
Channel sounding
Multiple-input multiple-output (MIMO)
Ultra-Wideband (UWB)
https://orcid.org/0000-0003-2255-1842
LICENSE
license.txt
license.txt
text/plain; charset=utf-8
1748
https://laur.lau.edu.lb:8443/bitstream/10725/3089/2/license.txt
8a4605be74aa9ea9d79846c1fba20a33
MD5
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oai:laur.lau.edu.lb:10725/3089
2021-03-19 11:59:50.725
DSpace at LAU
joseph.sayah@lau.edu.lb
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