Download or read book Contribution la qualit de service dans les r seaux d acc s sans fil written by Mohamad El Masri and published by . This book was released on 2009 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: La thèse développe une contribution à la spécification, la modélisation et l'évaluation de mécanismes destinés à la fourniture de qualité de service dans les réseaux sans fil locaux et métropolitains. La première partie du travail concerne une modélisation en chaîne de Markov du protocole d'accès EDCA de IEEE 802.11e qui, par rapport aux modèles présents dans la littérature, ajoute des mécanismes du standard qui n'avaient pas été introduits (prise en compte explicite de la collision virtuelle) et corrige des erreurs de conception (prise en compte des périodes AIFS de la procédure de Backoff). Ce modèle a été rendu synthétique pour en faciliter l'usage (réductions réalisées à l'aide des règles de Beizer). Ce modèle a ensuite été utilisé pour définir un algorithme de contrôle d'admission hybride, intégrant dans son processus de décision un modèle analytique et des mesures de l'état du réseau. L'algorithme de contrôle d'admission ainsi développé a été en premier lieu validé puis comparé à d'autres algorithmes de contrôle d'admission par simulation sous ns-2. Notons aussi que nous avons proposé, une modification du comportement de EDCA face à une collision virtuelle assurant une meilleure équité aux catégories d'accès. Cette modification a été évaluée à l'aide du modèle. Une deuxième partie du travail consiste en la proposition pour WiMAX d'une architecture de gestion de bande passante pouvant fournir des garanties de qualité de service. Cette architecture se compose de trois parties interagissantes : 1- une gestion de la bande passante sous WiMAX assimilée à une classe de serveurs dite classe des serveurs latence-débit, 2- un mécanisme de requête-réponse de bande passante agrégée simplifiant la gestion de bande passante et la rendant plus flexible, 3- un protocole de contrôle d'admission associé à l'architecture et qui en garantit le bon fonctionnement. L'architecture ainsi conçue s'inscrit dans une prospective de réseaux hétérogènes sans fil (réseaux métropolitain WiMAX connectant entre eux et à Internet des réseaux locaux WiFi). C'est dans cette optique que s'inscrira la suite de notre travail. Elle consistera en la combinaison des mécanismes que nous proposons afin de fournir une solution complète de qualité de service pour des réseaux hétérogènes sans fil.

Download or read book Contribution l tude de la qualit de service written by Ibrahima Niang and published by . This book was released on 2002 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse s'intéresse à l'amélioration des schémas de qualité de service dans les réseaux "backbone" DiffServ et les réseaux d'accès sans fil 802.11. Une aide au dimensionnement est proposée pour configurer correctement un domaine DiffServ. Un mécanisme de marquage qui prend en compte la spécificité des flux multimédia lors de la traversée de plusieurs domaines est proposé. Cet algorithme est ensuite utilisé dans une architecture de contrôle de qualité de service dont le but est de permettre des mesures intra et inter-domaines...

Download or read book M canismes de Contr le de Qualit de Service Dans Des R seaux D acc s IP Sans Fil written by Neda Nikaein and published by . This book was released on 2000 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annales des t l communications written by and published by . This book was released on 2005-07 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book UNESCO s Internet universality indicators written by Souter, David and published by UNESCO Publishing. This book was released on 2019-04-23 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Building the Information Society written by and published by Gouvernement du Canada. This book was released on 1996 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This action plan aims at providing Canadians with a national framework for building an Information Highway that meets Canadians' needs, a framework that will facilitate Canada's transition toward an information society and knowledge economy. The action plan is made up of four strategic thrusts: building Canada's information highway; growing Canadian content; realizing the economic and social benefits for all Canadians; and, getting government right.

Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.

Download or read book Culture 2030 indicators written by UNESCO and published by UNESCO Publishing. This book was released on 2019-11-18 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book PASCAL written by and published by . This book was released on 1994 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book PROMOTION DE LA SANTE ET AUTONOMISATION DANS LE CONTEXTE AFRICAIN written by David HouŽto and published by Lulu.com. This book was released on 2014-02-26 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le terme promotion de la santé en Afrique, près de 30 ans après l'adoption de la Charte d'Ottawa, continue d'avoir des connotations complètement hors du sens que lui confère cette charte. Cela n'est pas étonnant quand on sait que la notion de santé dans ce contexte africain équivaut à la lutte contre la maladie à travers les soins de santé dispensés par des professionnels de la santé dans des formations sanitaires et les hôpitaux. L'évolution que connait le continent depuis quelques décennies est de donner un peu plus de place à la communauté à travers les relais communautaires dans une participation communautaire vidée de son contenu, car le pouvoir n'est jamais passé entre les mains des communautés.C'est au vu de tout ceci que le présent ouvrage à sa raison d'être pour expliquer les fondements de l'autonomisation communautaire et de la promotion de la santé avec leur importance pour la région africaine en proie aux mauvais indicateurs de santé comparativement aux autres régions du monde.

Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.

Download or read book Aspects of Medical Care Administration written by Avedis Donabedian and published by . This book was released on 1973 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Formation distance en Afrique sub saharienne francophone written by Jacques Guidon and published by . This book was released on 2007 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CMA written by and published by . This book was released on 1994-02 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Social Choice and Welfare written by Kenneth J. Arrow and published by Elsevier. This book was released on 2010-10-13 with total page 985 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second part of a two-volume set continues to describe economists' efforts to quantify the social decisions people necessarily make and the philosophies that those choices define. Contributors draw on lessons from philosophy, history, and other disciplines, but they ultimately use editor Kenneth Arrow's seminal work on social choice as a jumping-off point for discussing ways to incentivize, punish, and distribute goods. - Develops many subjects from Volume 1 (2002) while introducing new themes in welfare economics and social choice theory - Features four sections: Foundations, Developments of the Basic Arrovian Schemes, Fairness and Rights, and Voting and Manipulation - Appeals to readers who seek introductions to writings on human well-being and collective decision-making - Presents a spectrum of material, from initial insights and basic functions to important variations on basic schemes

Download or read book Multimedia over IP and Wireless Networks written by Mihaela van der Schaar and published by Elsevier. This book was released on 2011-07-28 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multimedia over IP and Wireless Networks is an indispensable guide for professionals or researchers working in areas such as networking, communications, data compression, multimedia processing, streaming architectures, and computer graphics. Beginning with a concise overview of the fundamental principles and challenges of multimedia communication and networking, this book then branches off organically to tackle compression and networking next before moving on to systems, wireless multimedia and more advanced topics. The Compression section advises on the best means and methodology to ensure multimedia signal (images, text, audio and data) integrity for transmissions on wireless and wired systems. The Networking section addresses channel protection and performance. In the Systems section, the focus is on streaming media on demand, live broadcast and video and voice's role in real-time communication. Wireless multimedia transmission and Quality of Service issues are discussed in the Wireless Multimedia section. An Advanced Topics section concludes the book with an assortment of topics including Peer-to-Peer multimedia communication and multipath networks. Up-to-date coverage of existing standards for multimedia networking Synergistic tutorial approach reinforces knowledge gained in previous chapters Balanced treatment of audio and video with coverage of end-to-end systems

Download or read book Comprehensive reports on technical items presented to the International Committee or to Regional Commissions written by International Office of Epizootics and published by . This book was released on 1996 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: