Time filter

Source Type

Dahmouni H.,Institute National des Postes et Telecommunications | Girard A.,INRS EMT | Ouzineb M.,Institute National Of Statistique Et Deconomie Appliquee | Sanso B.,Ecole Polytechnique de Montreal
IEEE Transactions on Network and Service Management | Year: 2012

Current network planning and design methods use the average delay, packet loss and throughput as metrics to optimize the network cost and performance. New multimedia applications, on the other hand, also have critical jitter requirements that are not taken into account by these methods. Here, we explore the impact on the network performance of adding these jitter constraints. We use a fast jitter calculation model to solve the optimal routing problem for flows subject to jitter or delay constraints. We find that the optimal routing is very different for the two kinds of flows: They should be routed on different paths, the jitter-constrained flows should not be split on multiple paths while the opposite conclusion is true for delay-constrained flows. © 2004-2012 IEEE.

Ouzineb M.,Institute National Of Statistique Et Deconomie Appliquee | Mhada F.,Mohammed V University | El Hallaoui I.,Ecole Polytechnique de Montreal | Pellerin R.,Ecole Polytechnique de Montreal
Proceedings of 2013 International Conference on Industrial Engineering and Systems Management, IEEE - IESM 2013 | Year: 2013

An unreliable single part type transfer line with fixed inter machine buffer sizes is considered. In general, imperfect machines operating with imperfect raw material, or partially processed raw material, will result in the production of a mix of conforming and non conforming parts. The problem of optimal joint assignment of buffer sizes and inspection station positions is here considered where we assume that defective parts are scrapped upon detection. The performance measure to be optimized is a combination of work in process storage and parts inspection costs, with an eye to determining the adequate number of inspection stations. We propose an exact method for solving this problem and large-scale numerical experiments are provided to demonstrate the efficiency of the proposed algorithm. Interesting properties of the problem are also denoted based on our empirical results. © 2013 International Institute for Innovation, Industrial Engineering and Entrepreneurship - I4e2.

Adlouni S.E.,Institute National Of Statistique Et Deconomie Appliquee | Ouarda T.B.M.J.,INRS - Institute National de la Recherche Scientifique
Geophysical Monograph Series | Year: 2010

The study of the rainfall probability distributions is important to estimate large events and their probability of occurrence. This paper presents the usefulness of extreme hydrological frequency analysis when the occurrences are independent in time to describe the likelihood of extreme events over the time horizon. Classical and recent developments are presented with illustrative examples. Copyright 2010 by the American Geophysical Union.

Fakhar K.,Mohammed V University | El Aroussi M.,Mohammed V University | Saidi M.N.,Mohammed V University | Saidi M.N.,Institute National Of Statistique Et Deconomie Appliquee | Aboutajdine D.,Mohammed V University
Information (Switzerland) | Year: 2015

This paper presents a new biometric score fusion approach in an identification system using the upper integral with respect to Sugeno's fuzzy measure. First, the proposed method considers each individual matcher as a fuzzy set in order to handle uncertainty and imperfection in matching scores. Then, the corresponding fuzzy entropy estimates the reliability of the information provided by each biometric matcher. Next, the fuzzy densities are generated based on rank information and training accuracy. Finally, the results are aggregated using the upper fuzzy integral. Experimental results compared with other fusion methods demonstrate the good performance of the proposed approach. © 2015 by the authors.

El Adlouni S.,Institute National Of Statistique Et Deconomie Appliquee | Chebana F.,INRS - Institute National de la Recherche Scientifique | Bobee B.,INRS - Institute National de la Recherche Scientifique
Journal of Hydrologic Engineering | Year: 2010

The Halphen system the generalized extreme-value (GEV) distributions are recommended for the estimation of the hydrological extreme events. The GEV system is widely used, whereas the Halphen distributions are less known by hydrologists. The objective of this study is to compare these two systems on the basis of various criteria. A simulation study was undertaken to assess the errors related to the fit of the Halphen distributions to samples generated by the GEV distribution vice versa. Results show that in the case of power-tail type, the Halphen type Inverse B (HIB) distribution is more adequate safer than the Fréchet (EV2) or Gumbel (EV1) distributions especially in the case of the small sample size. For subexponential class of distributions, both Halphen Type A (HA) Type B (HB) perform better than the Gumbel (EV1) distribution. When considering limiting distribution cases, results show a very similar behavior of EV1, gammainverse gamma distribution with a small advantage to the EV1 distribution. These results as well as the theoretical statistical properties of these systems of distributions indicate that the Halphen distributions can, in some cases, perform better than the GEV system are good candidate to fit extreme value variables. © 2010 ASCE.

Discover hidden collaborations