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Author: Laurent Besse
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Languages : fr
Pages : 0
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Author: Laurent Besse
Publisher:
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Category :
Languages : fr
Pages : 0
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Author: LAURENT.. DAIRAINE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 214
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LES SYSTEMES DE COMMUNICATION MULTIMEDIA MANIPULENT DE MANIERE INTEGREE PLUSIEURS TYPES D'INFORMATIONS. L'INTEGRATION DE MEDIAS AUX CARACTERISTIQUES DIFFERENTES ENGENDRE DES BESOINS SPECIFIQUES QUE LES SYSTEMES DOIVENT IMPERATIVEMENT PRENDRE EN COMPTE. UN DES PRINCIPAUX BESOINS EN MATIERE DE MULTIMEDIA EST LIE A LA DIMENSION TEMPORELLE INTRINSEQUE AUX TYPES D'APPLICATIONS ET AUX MEDIAS TRAITES. LA SYNCHRONISATION DANS LE CONTEXTE MULTIMEDIA EST LA TACHE DE COORDINATION, D'ORDONNANCEMENT ET DE PRESENTATION D'OBJETS MULTIMEDIA DANS LE TEMPS. NOUS DISTINGUONS TROIS TYPES DE SYNCHRONISTION: LA SYNCHRONISATION INTRA-FLUX, RELATIVE A LA PRESENTATION D'UN MEDIA UNIQUE, LA SYNCHRONISATION INTER-FLUX, QUI RELEVE DE LA PRESENTATION DE PLUSIEURS MEDIAS AU NIVEAU D'UN RECEPTEUR ET LA SYNCHRONISATION MULTI-DESTINATIONS, QUI COORDONNE LA PRESENTATION DE PLUSIEURS MEDIAS SUR DES RECEPTEURS DISTRIBUES. AU NIVEAU DES COMMUNICATIONS, LES DIFFERENTES FACETTES DE LA SYNCHRONISATION MULTIMEDIA SONT TRAITEES PAR UNE APPROCHE DIRECTEMENT LIEE AU TEMPS PHYSIQUE. LES FONCTIONS DE CONTROLE DE SIGNATURE TEMPORELLE INTRA-FLUX ASSOCIEES A CELLES DE COMPENSATION TEMPORELLE INTER-FLUX ASSURENT UN TRANSFERT DES INFORMATIONS EN ADEQUATION AVEC LES BESOINS APPLICATIFS. LES DIFFERENTES TECHNIQUES SONT INTEGREES DANS UNE ARCHITECTURE ADAPTEE AUX CARACTERISTIQUES DES COMMUNICATIONS HAUT-DEBIT, TESTEES PAR SIMULATION, PUIS MISES EN UVRE
Author: Abdelhafid Abouaissa
Publisher:
ISBN:
Category :
Languages : fr
Pages : 185
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LES DIX DERNIERES ANNEES ONT CONSTITUE LE TERREAU DE FORMIDABLES PROGRES EN MATIERE DE TECHNOLOGIES ET DE TECHNIQUES DE COMMUNICATION. AVEC L'INTEGRATION DES SYSTEMES DISTRIBUES TEMPS REEL, L'APTITUDE DE CES RESEAUX POUR MAINTENIR LA RELATION TEMPORELLE DES APPLICATIONS MULTIMEDIA DEVIENT DE PLUS EN PLUS IMPORTANTE, SURTOUT DANS LE RESEAU INTERNET OU LES MESSAGES CONSOMMENT DE PLUS EN PLUS DE RESSOURCES. A CAUSE DU MODE DE TRANSFERT ASYNCHRONE UTILISE PAR LES RESEAUX A HAUT DEBIT TEL QUE ATM, CETTE RELATION TEMPORELLE RISQUE D'ETRE ROMPUE, CE QUI ENTRAINE UN DESEQUENCEMENT DE MESSAGES PENDANT LA PHASE DE LIVRAISON. EN EFFET, L'ACHEMINEMENT DES MESSAGES DE COMMUNICATION ENTRE LES PROCESSUS DOIT SOUVENT RESPECTER UNE RELATION D'ORDRE PARTICULIERE. PARMI CES ORDONNANCEMENTS, NOUS EN DISTINGUONS TROIS PRINCIPAUX : FIFO, CAUSAL ET TOTAL. CES TYPES D'ORDONNANCEMENT GARANTISSENT UNE CONTRAINTE NATURELLE QUI EST LA RELATION DE CAUSE A EFFETS, CEPENDANT ILS NE SUPPORTENT PAS DE CONTRAINTE TEMPORELLE IMPOSEE PAR LES MESSAGES MULTIMEDIA, D'OU L'INTERET D'UTILISER UN AUTRE CONCEPT DE CAUSALITE APPELE -CAUSALITE. DANS NOTRE TRAVAIL, NOUS NOUS INTERESSONS A LA SYNCHRONISATION MULTIMEDIA DANS UN SYSTEME DE COMMUNICATION DE GROUPES, OU LES MEMBRES PEUVENT SIMULTANEMENT RESTITUER LE MEME MESSAGE TEMPS REEL, TOUT EN RESPECTANT L'ORDRE CAUSAL TEMPS REEL. NOUS PROPOSONS UNE ARCHITECTURE HIERARCHIQUE EN K-GROUPES, OU K REPRESENTE LE NOMBRE DE SOUS-GROUPES DE SYSTEMES DE COMMUNICATION. NOUS PRESENTONS UNE ETUDE DE COMPLEXITE DES MESSAGES, DE MEME NOUS ETUDIONS LES PROPRIETES DE VIVACITE ET DE SURETE AFIN D'ASSURER UNE BONNE QUALITE DE SERVICE DE L'APPLICATION MULTIMEDIA. ENSUITE, NOUS PROPOSONS UN PROTOCOLE DE GROUPEMENT DYNAMIQUE, QUI PERMET DE RESOUDRE LE PROBLEME DE LA SURCHARGE DES PROCESSUS DURANT LA COMMUNICATION. CELA PERMET DE REDUIRE SENSIBLEMENT LE NOMBRE DE COMMUNICATIONS POUR UNE DIFFUSION RESTREINTE DONNEE : SEULS LES MEMBRES DU GROUPE CONSTRUITS DYNAMIQUEMENT ET VIRTUELLEMENT SONT CONCERNES. L'ARCHITECTURE HIERARCHIQUE EN K-GROUPES PERMET D'UNE PART DE CALCULER LA TAILLE DES BUFFERS POUR RESOUDRE LE PROBLEME DE LA GIGUE, ET POUR MIEUX CONTROLER LA SYNCHRONISATION DES HORLOGES LOCALES ET D'AUTRE PART, DE PRESENTER UN PROTOCOLE DE LIVRAISON CAUSAL EN TEMPS REEL, OU LES MEMBRES DE SYSTEME DE GROUPES PEUVENT SIMULTANEMENT RESTITUER LE MEME MESSAGE. DANS CE TRAVAIL, NOUS PRESENTONS UN PROTOCOLE DE SYNCHRONISATION VIRTUELLE DE GROUPES BASE SUR L'ORDRE CAUSAL EN PHASE, POUR GERER L'ASPECT DYNAMIQUE DES GROUPES. CET ORDONNANCEMENT CAUSAL PAR PHASE EST UTILE POUR TOUT PROGRAMME NECESSITANT UNE SYNCHRONISATION GLOBALE, DANS LE BUT EST DE GARANTIR LA LIVRAISON CAUSALE DES MESSAGES EN TEMPS REEL. ENFIN, NOUS AVONS SIMULE ET VALIDE CES DIFFERENTS ALGORITHMES AVEC LES RESEAUX DE PETRI COLORES EN UTILISANT L'OUTIL DESIGN/CPN, POUR ETUDIER L'ASPECT QUALITATIF ET MESURER LES PERFORMANCES DES PROTOCOLES. CES TRAVAUX ONT DONNE LIEU A PLUSIEURS PUBLICATIONS INTERNATIONALES DANS CE DOMAINE.
Author: Walid Dabbous
Publisher:
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Category :
Languages : fr
Pages :
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LES AVANCEES TECHNOLOGIQUES DANS LES DOMAINES DE LA TRANSMISSION ET DE LA COMMUTATION A CONDUIT AU DEVELOPPEMENT DE RESEAUX A HAUT DEBIT TELS QUE FDDI, DQDB ET LE RNIS LARGE BANDE. L'AUGMENTATION DES DEBITS DE TRANSMISSION AU-DELA DE 100 MBITS PAR SECONDE PERMET DE CONSIDERER DE NOUVELLES APPLICATIONS RESEAU (DITES APPLICATIONS MULTIMEDIAS) SUPPORTANT UNE INTEGRATION DE PLUSIEURS TYPES DE FLOTS AYANT DES CARACTERISTIQUES DIFFERENTES, COMME LES DONNEES TEXTUELLES, LA VOIX NUMERISEE ET LES IMAGES VIDEO. CEPENDANT, L'IMPLANTATION DE TELLES APPLICATIONS SUR LES RESEAUX A HAUT DEBIT POSE UN PROBLEME AU NIVEAU DU CONTROLE DE LA TRANSMISSION DES DIFFERENTS FLOTS ET DE LEUR SYNCHRONISATION. CETTE THESE S'INTERESSE A LA CONCEPTION ET A L'IMPLANTATION DE PROTOCOLES DE TRANSPORT A HAUT DEBIT ET EN PARTICULIER CEUX QUI SONT ADAPTES AUX APPLICATIONS MULTIMEDIAS. NOUS ANALYSONS LES MECANISMES UTILISES PAR LES PROTOCOLES DE TRANSPORT AFIN DE DETECTER LES POINTS DE BLOCAGES QUI EMPECHENT L'AMELIORATION DES DEBITS DE SE PROPAGER JUSQU'AUX APPLICATIONS, EN PRENANT EN COMPTE LES AVANCEES TECHNOLOGIQUES ET LES BESOINS DES APPLICATIONS. CECI NOUS AMENE A LA DEFINITION D'UN NOUVEAU SERVICE DE TRANSPORT TYPE SELON LA NATURE DU FLOT DE DONNEES A TRANSMETTRE. NOUS PRESENTONS ENSUITE UN PROTOCOLE DE TRANSPORT OPTIMISE (APPELE TP5) QUI FOURNIT AUX APPLICATIONS LE SERVICE TYPE ET LES FACILITES POUR LA SYNCHRONISATION DES DIFFERENTS FLOTS DE DONNEES AU NIVEAU TRANSPORT. NOUS ANALYSONS ENSUITE LE COUT DE DEUX MODES DE SYNCHRONISATION POSSIBLES OFFERTS PAR TP5 ET NOUS MONTRONS QUE LE SERVICE DE TRANSPORT TYPE PERMET D'AMELIORER LA QUALITE DE SERVICE FOURNIE AUX APPLICATIONS MULTIMEDIAS
Author: Laurent Dairaine
Publisher:
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Category :
Languages : fr
Pages :
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Author: Alexander V. Sergienko
Publisher: CRC Press
ISBN: 1420026607
Category : Science
Languages : en
Pages : 248
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Book Description
All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
Author: Martin Maier
Publisher: Cambridge University Press
ISBN: 1139504665
Category : Technology & Engineering
Languages : en
Pages : 276
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Book Description
The evolution of broadband access networks toward bimodal fiber-wireless (FiWi) access networks, described in this book, may be viewed as the endgame of broadband access. After discussing the economic impact of broadband access and current worldwide deployment statistics, all the major legacy wireline and wireless broadband access technologies are reviewed. State-of-the-art GPON and EPON fiber access networks are described, including their migration to next-generation systems such as OCDMA and OFDMA PONs. The latest developments of wireless access networks are covered, including VHT WLAN, Gigabit WiMAX, LTE and WMN. The advantages of FiWi access networks are demonstrated by applying powerful network coding, heterogeneous optical and wireless protection, hierarchical frame aggregation, hybrid routing and QoS continuity techniques across the optical-wireless interface. The book is an essential reference for anyone working on optical fiber access networks, wireless access networks or converged FiWi systems.
Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005023
Category : Computers
Languages : en
Pages : 190
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Electric engineering
Languages : en
Pages : 444
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Author: James Harley
Publisher: Routledge
ISBN: 1135874948
Category : Biography & Autobiography
Languages : en
Pages : 306
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Book Description
Xenakis: His Life in Music is a full-length study of the influential contemporary composer Iannis Xenakis. Following the trajectory of Xenakis’s compositional development, James Harley, who studied with Xenakis, presents the works together with clear explanations of the technical and conceptual innovations that shaped them. Harley examines the relationship between the composer and two early influences: Messiaen and Le Corbusier. Particular attention is paid to analyzing works which were vital to the composer’s creative development, from early, unpublished works to the breakthrough pieces Metastasis and Pithoprakta, through the oft-discussed decade of formalization and the evolving styles of the succeeding three decades.
