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Tunis, Tunisia

The University of Carthage is a university located in Tunis, Tunisia. It was founded in 1988. Wikipedia.

Karoui A.,University of Carthage
Journal of the Franklin Institute

In this work, we give a brief description of the theory and the properties of the 1-D and 2-D prolate spheroidal wave functions (PSWFs). Then, we study some efficient methods for the computation of the different PSWFs and their associated eigenvalues. More precisely, we shall develop a quadrature method for the approximation of the 1-D PSWFs. Then, we extend this method to the construction of the 2-D PSWFs that are concentrated on the unit disk. Also, we give a brief review of the quality of approximation of almost band-limited functions by the 1-D PSWFs. Moreover, we use some numerical tests to compare between PSWFs and wavelets as signal processing tools. In particular, we give some numerical tests that highlight the efficiency of the PSWFs in processing band-limited signals. © 2010 The Franklin Institute. Published by Elsevier Ltd. All rights reserved. Source

Kaaniche M.-B.,University of Carthage | Bremond F.,French Institute for Research in Computer Science and Automation
IEEE Transactions on Pattern Analysis and Machine Intelligence

We introduce a new gesture recognition framework based on learning local motion signatures (LMSs) of HOG descriptors introduced by [1]. Our main contribution is to propose a new probabilistic learning-classification scheme based on a reliable tracking of local features. After the generation of these LMSs computed on one individual by tracking Histograms of Oriented Gradient (HOG) [2] descriptor, we learn a codebook of video-words (i.e., clusters of LMSs) using k-means algorithm on a learning gesture video database. Then, the video-words are compacted to a code-book of codewords by the Maximization of Mutual Information (MMI) algorithm. At the final step, we compare the LMSs generated for a new gesture w.r.t. the learned code-book via the k-nearest neighbors (k-NN) algorithm and a novel voting strategy. Our main contribution is the handling of the N to N mapping between codewords and gesture labels within the proposed voting strategy. Experiments have been carried out on two public gesture databases: KTH [3] and IXMAS [4]. Results show that the proposed method outperforms recent state-of-the-art methods. © 2012 IEEE. Source

Mhiri F.,University of Carthage | Sethom K.,University Pierre and Marie Curie | Bouallegue R.,TIME Higher School
Journal of Network and Computer Applications

The femtocell concept is an emerging technology for deploying the next generation of the wireless networks, aiming at indoor coverage enhancement, increasing capacity, and offloading the overlay macrocell traffic. Nevertheless, one of the most critical issues in femtocells is the potential interference between nearby femtocells and from femtocells to macrocells or to mobile handsets, thus mitigating the overall system capacity. In this paper, we have discussed mechanisms which can be deployed to lessen the interference and increase the user capacity. Therefore, we provide a survey on the different interference and resource management techniques in Self-Organizing Network according to specifics classification criteria. These techniques derive from the following approaches: power control, proper cell planning, frequency reuse, OFDMA, self-configuration and self-optimization, conventional TDD, etc. These techniques can be applied separately and can be used as hybrid. A qualitative comparison among the different approaches and techniques is provided at the end of this paper. © 2012 Elsevier Ltd. Source

Naghmouchi I.,University of Carthage
International Journal of Bifurcation and Chaos

We show that, for monotone graph map f, all the ω-limit sets are finite whenever f has periodic point and for monotone dendrite map, any infinite ω-limit set does not contain periodic points. As a consequence, monotone graph and dendrite maps have no LiYorke pairs. However, we built a homeomorphism on a dendroid with a scrambled set having nonempty interior. © 2011 World Scientific Publishing Company. Source

Jammazi C.,University of Carthage
IMA Journal of Mathematical Control and Information

The article gives Lyapunov-type sufficient conditions for partial finite-time and asymptotic stability in which some state variables converge to zero, while the rest converge to constant values that possibly depend on the initial conditions. The article then presents partially asymptotically stabilizing controllers for many non-linear control systems for which continuous asymptotically stabilizing (in the usual sense) controllers are known not to exist. Source

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