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Analyse De Performance Des Reseaux Optiques A Commutation En Sous Longueur Donde
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Book Synopsis Analyse de performance des réseaux optiques à commutation en sous-longueur d'onde by : Raluca Maria Indre
Download or read book Analyse de performance des réseaux optiques à commutation en sous-longueur d'onde written by Raluca Maria Indre and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Un défi majeur dans les réseaux d'aujourd'hui est de combler l'écart entre la haute vitesse de la transmission optique et la vitesse plus limitée du traitement électronique des données. Une option est de commuter les données directement dansle domaine optique. Dans cette thèse, nous proposons plusieurs solutions permettant la commutation dans le domaine optique à une granularité plus fine que la longueur d'onde, technique que nous appelons commutation sous-longueurd'onde. Pour montrer la pertinence des solutions proposées, nous analysons leur performance en termes de capacité de trafic, de débit et de délai. La performance est évaluée à la fois par des simulations et en utilisant des modèles de filesd'attente appropriés. Nous considérons d'abord le cas des réseaux métropolitains (Metropolitan Area Networks, MAN) et nous étudions la performance d'un anneau optique avec multiplexage en longueur d'onde (Wavelength Division Multiplexing, WDM) dans lequel la communication entre les noeuds du réseau se fait par insertion/extraction de données dans des créneaux temporels. Nous présentons un protocole entièrement distribué conçu pour assurer l'équité dansce réseau. Nous proposons également un mécanisme d'assemblage de paquets capable d'assurer des délais faibles ainsi que des taux de remplissage élevés. Nous proposons ensuite des solutions de commutation sous-longueur d'onde qui peuvent être appliquées dans le cas plus général des réseaux asynchrones. D'abord, nous proposons de résoudre le problème des collisions de la commutation optique par rafale (Optical Burst Switching, OBS) par la mise en oeuvre d'un mécanisme de réservation. Afin de maximiser l'utilisation des ressources, nous proposons d'adapter la taille de la rafale optique à la charge du réseau.Ensuite, nous proposons une solution alternative pour construire un réseau coeur tout-optique. A cette architecture, nous associons un protocole d'accès ainsi qu'un algorithme d'allocation dynamique de bande passante et nous analysons les performances de la solution proposée. Par le biais d'une étude de cas, nousmontrons que notre solution est capable de réduire considérablement la consommation énergétique par rapport aux architectures actuelles basées sur des routeurs IP. Enfin, nous proposons un nouveau dispositif optique capable derésoudre la contention directement dans le domaine optique. Nous montrons que ce dispositif simple peut être utilisé pour construire des réseaux optiques dynamiques à courte portée tels que les réseaux d'accès ou les centres de traitement de données.
Book Synopsis EVALUATION DES PERFORMANCES D'UN COMMUTATEUR DE PAQUETS OPTIQUES by : PHILIPPE.. CADRO
Download or read book EVALUATION DES PERFORMANCES D'UN COMMUTATEUR DE PAQUETS OPTIQUES written by PHILIPPE.. CADRO and published by . This book was released on 1998 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: ON ASSISTE AUJOURD'HUI A L'EMERGENCE DES NOUVEAUX RESEAUX LARGE-BANDE BASES SUR LE MODE DE TRANSFERT ASYNCHRONE, L'ATM. LA GESTION DU TRAFIC, AINSI QUE LA COMMUTATION DES INFORMATIONS DANS CE MODE DE TRANSFERT S'APPUIENT SUR UNE TECHNOLOGIE BASEE SURL'ELECTRONIQUE. GRACE A L'ARRIVEE DES FIBRES OPTIQUES, AVEC UNE BANDE PASSANTE APPROCHANT 30 THZ, DE NOUVELLES TECHNOLOGIES ONT ETE DEVELOPPEES POUR GERER DES COMMUNICATIONS A TRES HAUT DEBIT (DE L'ORDRE DU GBIT/S). LE MULTIPLEXAGE EN LONGUEURS D'ONDE (WDM) PERMET AINSI DE CONSTRUIRE PLUSIEURS EQUIPEMENTS DE TRANSMISSION TRAVAILLANT EN PARALLELE, A DIFFERENTES LONGUEURS D'ONDE, SUR LA MEME FIBRE. EN CONTREPARTIE, L'UTILISATION DE CES TECHNOLOGIES OPTIQUES NECESSITE LA DEFINITION DE NOUVEAUX MODES DE TRANSFERT DE L'INFORMATION, LE BUT ETANT DE CREER DES RESEAUX TOUT OPTIUE. L'OBJECTIF DE CETTE THESE EST D'EVALUER LES PERFORMANCES D'UN COMMUTATEUR DE PAQUETS OPTIQUES, CONCU DANS LE CADRE D'UN RESEAU WDM. CE COMMUTATEUR UTILISE DES LIGNES A RETARD POUR RESOUDRE LA CONTENTION ENTRE PAQUETS. CHAQUE PAQUET A ACCES A UN NOMBRE LIMITE DE LIGNES A RETARD DE DELAIS NON NECESSAIREMENT CONSECUTIFS. CES LIGNES A RETARD PERMETTENT D'EMULER DES FILES D'ATTENTE NON FIFO. DES MODELES MATHEMATIQUES, DEVELOPPES AFIN D'ETUDIER CES FILES PARTICULIERES, SONT PRESENTES ET MONTRENT, ENTRE AUTRES, QUE L'ARCHITECTURE PROPOSEE PERMET D'OBTENIR DES PERFORMANCES COMPARABLES A CELLES OFFERTES PAR DES FILES FIFO TOUT EN REDUISANT DE FACON SIGNIFICATIVE LE NOMBRE NECESSAIRE DE LIGNES A RETARD.
Book Synopsis Evaluation de Performance, Allocation de Ressources Et Qualité de Service Dans Les Réseaux Optiques Multiservices À Commutation de Paquets by : Thaere Eido
Download or read book Evaluation de Performance, Allocation de Ressources Et Qualité de Service Dans Les Réseaux Optiques Multiservices À Commutation de Paquets written by Thaere Eido and published by . This book was released on 2008 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le développement des technologies optiques a atteint un niveau de maturité avancé et leur déploiement dans les réseaux métropolitains est devenu désormais réalisable. L'optique fournit une grande capacité de transmission et des revenus attractifs. Le besoin croissant en bande passante, imposé par l'émergence des applications de données, a motivé l'orientation vers le développement de la technologie de commutation de paquets optiques. Cette dernière fournit des gains significatifs en termes de capacité de passage à l'échelle et d'efficacité de gestion des ressources du réseau. Les futurs réseaux demanderont davantage de faisabilité, de remise à l'échelle et de gestion. La convergence des plans de données et de celui de transport est essentielle à la réalisation de ces objectifs. Le protocole GMPLS est un très bon candidat pour une telle convergence. Cette thèse a pour objectif l'étude de la performance de diverses architectures optiques nouvelles. Nous visons essentiellement l'identification et la résolution de quelques problèmes qui caractérisent divers choix de conception d'architecture optique. Parmi ces choix, nous citons la topologie du réseau, le mode de connectivité, le mode de transmission (asynchrone vs synchrone) et le format de paquet optique (taille fixe vs taille variable). Trois volets principaux seront particulièrement adressés: L'évaluation de la performance, l'allocation de ressources et la gestion de la qualité de service dans les réseaux optiques à commutation de paquets. Afin de caractériser la performance des architectures étudiées, nous proposons deux modèles analytiques que nous appliquons respectivement à des architectures optiques multiservices en anneau et maillées qui transportent des paquets de taille fixe. Les modèles proposés capturent l'impact de la matrice de trafic et, dans le cas d'une architecture maillée, de la "table de commutation" des routeurs. En utilisant ces modèles, nous avons déterminé des expressions de plusieurs métriques de performance, dont la valeur moyenne et la variance du délai d'accès, le délai moyen de traversé d'un nœud de cœur et les taux de pertes à l'accès et dans le cœur du réseau. Les modèles développés incorporent également deux mécanismes d'accès (PEM et ERM), un mécanisme de gestion de l'équité entre classes de service (CCM) et un mécanisme de résolution de contention de ressources (DDR) que nous avons proposés. Enfin, les modèles développés peuvent être appliqués plus généralement à divers systèmes synchrones avec un service périodique et une possibilité de blocage de service. Nous avons conçu trois mécanismes d'allocation de ressources : R2A, CENTRAL-SR et G2AR. L'algorithme R2A fournit une solution dynamique et efficace pour l'allocation de ressources dans un réseau asynchrone avec une topologie en anneau. Cependant, les mécanismes CENTRAL-SR et G2AR effectuent la réservation de ressources dans des architectures optiques synchrones respectivement organisées en anneau et en topologie maillée. Quant à lui, l'algorithme G2AR maximise le volume de requêtes de connexion acceptées dans le réseau et fournit des solutions efficaces de calcul de chemin et de reconfiguration après panne. Nous proposons également dans ce travail un mécanisme d'amélioration du remplissage de paquets optiques de taille fixe (mécanisme GPFO) et un mécanisme d'ordonnancement de paquets (RMPS). Le mécanisme GPFO accroît l'efficacité d'utilisation de ressources dans un mode de transmission de paquets optiques de taille fixe. Finalement, RMPS exploite la capacité de mémorisation électronique dans les nœuds d'accès afin de réduire les contentions de ressources dans le cœur du réseau.
Download or read book Annales des télécommunications written by and published by . This book was released on 1997 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atmospheric Science by : John M. Wallace
Download or read book Atmospheric Science written by John M. Wallace and published by Elsevier. This book was released on 2006-03-24 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric Science, Second Edition, is the long-awaited update of the classic atmospheric science text, which helped define the field nearly 30 years ago and has served as the cornerstone for most university curricula. Now students and professionals alike can use this updated classic to understand atmospheric phenomena in the context of the latest discoveries, and prepare themselves for more advanced study and real-life problem solving. This latest edition of Atmospheric Science, has been revamped in terms of content and appearance. It contains new chapters on atmospheric chemistry, the Earth system, the atmospheric boundary layer, and climate, as well as enhanced treatment of atmospheric dynamics, radiative transfer, severe storms, and global warming. The authors illustrate concepts with full-color, state-of-the-art imagery and cover a vast amount of new information in the field. Extensive numerical and qualitative exercises help students apply basic physical principles to atmospheric problems. There are also biographical footnotes summarizing the work of key scientists, along with a student companion website that hosts climate data; answers to quantitative exercises; full solutions to selected exercises; skew-T log p chart; related links, appendices; and more. The instructor website features: instructor's guide; solutions to quantitative exercises; electronic figures from the book; plus supplementary images for use in classroom presentations. Meteorology students at both advanced undergraduate and graduate levels will find this book extremely useful. - Full-color satellite imagery and cloud photographs illustrate principles throughout - Extensive numerical and qualitative exercises emphasize the application of basic physical principles to problems in the atmospheric sciences - Biographical footnotes summarize the lives and work of scientists mentioned in the text, and provide students with a sense of the long history of meteorology - Companion website encourages more advanced exploration of text topics: supplementary information, images, and bonus exercises
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Book Synopsis Microwave Scanning Antennas: Apertures by : Robert C. Hansen
Download or read book Microwave Scanning Antennas: Apertures written by Robert C. Hansen and published by . This book was released on 1964 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author :Advisory Committee on Technology and Society Publisher :National Academies Press ISBN 13 :0309037867 Total Pages :368 pages Book Rating :4.3/5 (9 download)
Book Synopsis Cities and Their Vital Systems by : Advisory Committee on Technology and Society
Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1988-02-01 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.
Download or read book Indium Seals written by R. O. Adams and published by . This book was released on 1964 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of using indium seals for large vacuum bell jars has been investigated. It is shown that such seals can be made; however, use of this type seal for repetitive operations is not recommended.
Book Synopsis Building Wireless Community Networks by : Rob Flickenger
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.
Book Synopsis Ultra Wide Band Antennas by : Xavier Begaud
Download or read book Ultra Wide Band Antennas written by Xavier Begaud and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Book Synopsis Organic Solid-State Lasers by : Sébastien Forget
Download or read book Organic Solid-State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
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 MIMO written by Alain Sibille and published by Academic Press. This book was released on 2010-12-03 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) - The first book to show how MIMO principles can be implemented in today's mobile broadband networks and components - Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems - Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
Book Synopsis Principles of Radar and Sonar Signal Processing by : Chevalier François Le
Download or read book Principles of Radar and Sonar Signal Processing written by Chevalier François Le and published by Artech House. This book was released on 2002 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
