CONTRIBUTION A LA CONCEPTION ET A L'ANALYSE DES SYSTEMES DE COMMUNICATION A HAUT DEBIT
CONTRIBUTION A LA CONCEPTION ET A L'ANALYSE DES SYSTEMES DE COMMUNICATION A HAUT DEBIT

Author: DANIEL.. ABENSOUR

Publisher:

Published: 1991

Total Pages:

ISBN-13:

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LE TRAVAIL PROPOSE DANS CETTE THESE EST ORGANISE EN QUATRE PARTIES. LA PREMIERE PARTIE EST L'ETUDE QUALITATIVE ET QUANTITATIVE DES SERVICES DE TRANSPORT ET DES SERVICES A VALEUR AJOUTEE A HAUT DEBIT QUI SERONT OFFERTS PAR LES AGENCES DE TELECOMMUNICATIONS. L'ANALYSE DETAILLEE DES PROTOCOLES UTILISES PARLES RELAYAGES DE TRAMES SERT A MONTRER LES SIMPLIFICATIONS POSSIBLES DE LOGICIEL DE COMMUNICATION ET LES AVANTAGES DE PERFORMANCES OBTENUS DANS UN ENVIRONNEMENT CARACTERISE PAR DES LIGNES A HAUT DEBIT ET A TRES FAIBLE TAUX D'ERREUR. LA SECONDE PARTIE COUVRE LE DOMAINE DES APPLICATIONS QUI JUSTIFIENT LES MOYENS DE TRANSMISSION A HAUT ET A TRES HAUT DEBIT. L'ETUDE DES SYSTEMES DE SAUVEGARDE A DISTANCE EST UTILISEE POUR MONTRER LES LIMITES DES PRODUITS ACTUELS ET POUR SOULIGNER LE BESOIN DE STRUCTURES NOUVELLES QUI PERMETTRONT DE FONCTIONNER DANS L'ENVIRONNEMENT A TRES HAUT DEBIT. L'UTILISATION DES IMAGES NUMERIQUES ET LEUR TRANSMISSION SUR DES RESEAUX TELEINFORMATIQUES EST ANALYSEE SUR LE PLAN DES PERFORMANCES. LA TROISIEME PARTIE DE CETTE ETUDE SE RAPPORTE AUX TECHNOLOGIES NOUVELLES DE CONNEXIONS LOCALES A HAUT DEBIT. LES ENVIRONNEMENTS ETUDIES VARIENT DEPUIS LA SALLE MACHINE CLASSIQUE JUSQU'AUX RESEAUX LOCAUX A TRES HAUT DEBIT ET INCLUENT LES CONNEXIONS DE SUPER ORDINATEURS. L'ACCENT EST MIS SUR L'UTILISATION DE COMMUTATEURS NON BLOQUANT POUR PERMETTRE CES CONNEXIONS. LES PROBLEMES D'EXTENSION DE CANAUX D'ORDINATEURS CENTRAUX SONT ANALYSES ET DES SOLUTIONS SONT PROPOSEES ET DECRITES. LA QUATRIEME PARTIE ENONCE LES PRINCIPES DE SIMPLIFICATION D'ARCHITECTURE NECESSAIRES POUR POUVOIR FONCTIONNER DANS LE FUTUR ENVIRONNEMENT. UNE NOUVELLE STRUCTURE DE MACHINE EST PROPOSEE ET EST COMPAREE SUR LE PLAN DES PERFORMANCES AVEC UNE STRUCTURE CLASSIQUE

Contribution a l'etude d'une chaine de telecommunication privée haut debit a integration de services (B-ISDN)
Contribution a l'etude d'une chaine de telecommunication privée haut debit a integration de services (B-ISDN)

Author: Jiyong Wu

Publisher:

Published: 1991

Total Pages: 216

ISBN-13:

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LA CHAINE DE TELECOMMUNICATION PRIVEE HAUT DEBIT PRESENTEE EST CONSTITUEE DE PLUSIEURS ELEMENTS: LE TERMINAL MULTIMEDIA, LE COMMUTATEUR PRIVE HAUT DEBIT, LE RESEAU OPTIQUE ET LE COMMUTATEUR AIM COMME NUD DU RESEAU. LES OBJECTIFS PRINCIPAUX DE CETTE CONCEPTION SONT: A) INTRODUIRE DE NOUVEAUX SERVICES DANS LE DOMAINE PRIVE COMME MESSAGERIE VOCALE VISIOPHONE, VIDEOCONFERENCE...; B) ETENDRE LA LIMITE GEOGRAPHIQUE ET LA CONNECTIVITE DES SYSTEMES ET DES RESEAUX EXISTANTS: C) EXPERIMENTER ET VALIDER LES TECHNOLOGIQUES NOUVELLES: D) MESURER DE FACON QUANTITATIVE LES BESOINS REELS DE NOUVEAUX SERVICES. LA CONTRIBUTION A CETTE ETUDE SE DIVISE EN 5 PARTIES: 1) PROPOSITION ET ETUDE DES PAQUETISEURS ET D'UN MULTIPLEXEUR DE PAQUETS POUR LE TERMINAL MULTIMEDIA; 2) DEFINITION D'UN NOUVEAU COMMUTATEUR PRIVE HAUT DEBIT MULTISERVICES (AVEC DES BREVETS EUROPEENS). SES PERFORMANCES SONT ETABLIES PAR MODELISATION ET SIMULATION; 3) ETUDE DE LA POLITIQUE DE L'ALLOCATION DES CANAUX EN MODE CIRCUIT ENVISAGEE POUR FDDI-II ET QPSX. ENSUITE, PROPOSITION DES POLITIQUES NOUVELLES AFIN D'AMELIORER LES PERFORMANCES; 4) ETUDE DE DEUX FILES D'ATTENTE EN COMPETITION AVEC CAPACITE FINIE ET APPLICATION POUR LA DEFINITION DES SCHEMAS DE PRIORITE DE TRANSMISSION DANS L'INTERCONNEXION DES PBX HAUT DEBIT ET DES RESEAUX LOCAUX; 5) PERFORMANCE D'UN COMMUTATEUR ATM POUR LES SERVICES VIDEO

CALL Research Perspectives
CALL Research Perspectives

Author: Joy L. Egbert

Publisher: Routledge

Published: 2006-04-21

Total Pages: 345

ISBN-13: 1135608385

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CALL Research Perspectives creates a foundation for the study and practice of computer-assisted language learning and provides an overview of ways to conceptualize and to conduct research in CALL. Its core assumptions are that all approaches to research have a place, and that researchers, teachers, and students all have a role to play in the study of computer-enhanced language learning. This is not a how-to-do-research text. Written by top researchers in the field, it offers an open-ended view of what educators need to know and be able to do to answer questions that they have. It is intended to be easy to read, to provide resources for readers to explore the ideas further, and to be non-prescriptive in presenting suggestions for CALL research. The text explores problems with current CALL research and suggests ways that teachers and other researchers can avoid such problems; presents both commonly known and less explored theories that provide a foundation for CALL and language research; and addresses other issues and ideas that affect research outcomes. An outstanding feature of CALL Research Perspectives is that it complements not only other CALL texts but also research texts of all kinds. The issues found in each chapter parallel the issues in other research texts, making this text useful for addressing the needs of teachers and researchers at different levels and in different contexts. In addition, the consistent format throughout makes it accessible to readers with a variety of backgrounds. Each chapter includes an introduction, a review of relevant literature, a set of examples and/or suggestions for conducting research in CALL, and conclusions. The consistent format is intended for ease of use, but the content of chapters varies according to the author. This is intentional; it is a strength of the book that readers can hear the voices of the authors and listen to their understandings of the perspectives presented. It is the editors' hope that they will be inspired to seek out other voices as well.

The Next Generation
The Next Generation

Author: Lara Lomicka

Publisher:

Published: 2009-03-12

Total Pages: 265

ISBN-13: 9780989120845

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This volume offers an introduction to some Web 2.0 technologies. The primary goal of the volume is to establish where we are in terms of Web 2.0 tools for teaching and research, especially in language education. While the volume introduces many Web 2.0 tools and explores how these tools can be used in a classroom, it also offers reader an array of options in how to carry out SLA research using those tools.

Multimedia over IP and Wireless Networks
Multimedia over IP and Wireless Networks

Author: Mihaela van der Schaar

Publisher: Elsevier

Published: 2011-07-28

Total Pages: 713

ISBN-13: 0080474969

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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