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Toulouse, France

Guesmia M.,Oran University of Science and Technology - Mohamed Boudiaf | Guezouri M.,Oran University of Science and Technology - Mohamed Boudiaf | Mbarek N.,Laboratoire dElectronique
International Journal of Communication Networks and Distributed Systems | Year: 2014

We propose a new media access control (MAC) layer enabling quality of service (QoS) multicast scheme for IEEE 802.11s networks, where a unicast routing protocol called hybrid wireless mesh protocol (HWMP) is defined. The HWMP protocol is more adapted for best effort traffic that is why its usage is not suitable for real time multimedia applications. The goal of our proposed mechanism is to take into account multicast communication under QoS constraints for the IEEE 802.11s mesh networks where no QoS multicasting has been defined. Our multicasting scheme handles QoS guarantee for real time applications. Indeed, our scheme is based on finding the QoS multicast tree thanks to an end-to-end delay evaluation to cover multicast services. A QoS multicast tree is constructed based on the proactive tree HWMP mechanisms. Simulations results, using Network Simulator 3 (NS 3), show that our scheme improves data multicast transmission overhead as well as network throughput. © 2014 Inderscience Enterprises Ltd. Source

Ziar T.,University of Oum El Bouaghi | Zaabat M.,University of Oum El Bouaghi | Baudrand H.,Laboratoire dElectronique
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields | Year: 2013

The aim of this manuscript is to present the application of an iterative method based on the concept of transverse wave to analyze the packaging (passive element and substrate) miniaturization effect on the characteristics of an active planar circuit structure. This approach consists in the substitution of the active element by one auxiliary source, and connection is assumed by microstrip line as passive element deposited on one unique substrate. An implementation of the presented theory is shown by extraction of S-parameters and impedances of the active circuit using MATLAB program codes. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd. Source

Sboui N.,Laboratoire Delectronique Departement Of Physique | Salouha A.,Laboratoire Delectronique Departement Of Physique | Latrach L.,Laboratoire Delectronique Departement Of Physique | Gharsallah A.,Laboratoire Delectronique Departement Of Physique | And 2 more authors.
Applied Computational Electromagnetics Society Journal | Year: 2012

A precise technique based on the wave concept iterative procedure (WCIP) and a fast mode transformation (FMT) is used to adjust the frequency selective surface (FSS) response. This adjustment is achieved by integrating RF-MEMS switches. These systems use the manufacturing processes of integrated circuits. In order to initialize the iterative procedure, an incident wave is defined in spectral domain. The numerical results are compared to those obtained with the finite element method (FEM). The good agreement between simulated and published data justifies the design procedure. © 2012 ACES. Source

Khalfaoui S.,IUT | Seulin R.,Laboratoire dElectronique | Fougerolle Y.,Laboratoire dElectronique | Fofi D.,Laboratoire dElectronique
Traitement du Signal | Year: 2014

This paper presents three methods for the digitization of 3D objects without prior knowledge on their shape. The first method is simple and naïve and is based on the generation of view points by sampling the bounding box of the acquired data at each step of the acquisition process. The second method is an analysis of the orientation of the scanned parts. The third method explores the barely visible surfaces and is a combination of the angular visibility and the real one by ray tracing. Tests with objects of different complexity classes were performed. The results of digitization are provided and prove the efficiency and the robustness of our approaches. © 2014 Lovoisier. Source

Harouni Z.,Laboratoire dElectronique | Osman L.,Laboratoire dElectronique | Yeddes M.,Laboratoire dElectronique | Gharsallah A.,Laboratoire dElectronique | Baudrand H.,Enseeht Laboratoire Delectrique
World Academy of Science, Engineering and Technology | Year: 2010

In this paper, an efficient wave concept iterative process (WCIP) with auxiliary Sources is presented for full wave investigation of an active microwave structure on micro strip technology. Good agreement between the experimental and simulation results is observed. Source

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