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Author: Martine Wahl
Publisher: John Wiley & Sons
ISBN: 1789451124
Category : Technology & Engineering
Languages : en
Pages : 276
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Book Description
Design and Evaluation of Ad Hoc Routing Protocol examines ad hoc communications between vehicles in a road environment. In this context, the book questions the sustainability of communications-dependent driver assistance services in areas where no communications infrastructure is operational. Starting with an ad hoc routing protocol proposed by the authors, this book presents a methodology from its design to its evaluation. It presents the functional requirements-based design approach and offers analyses to help us understand how the protocol functions, its properties and its performance in relation to target applications. This book is primarily aimed at beginners in the fields of protocol engineering, ad hoc networks or intelligent transport systems, but also provides specialists with an original perspective on the scientific literature in these fields. In particular, it offers concrete tools to help them develop their own methods for designing and evaluating communications protocols.
Author: Martine Wahl
Publisher: John Wiley & Sons
ISBN: 1789451124
Category : Technology & Engineering
Languages : en
Pages : 276
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Book Description
Design and Evaluation of Ad Hoc Routing Protocol examines ad hoc communications between vehicles in a road environment. In this context, the book questions the sustainability of communications-dependent driver assistance services in areas where no communications infrastructure is operational. Starting with an ad hoc routing protocol proposed by the authors, this book presents a methodology from its design to its evaluation. It presents the functional requirements-based design approach and offers analyses to help us understand how the protocol functions, its properties and its performance in relation to target applications. This book is primarily aimed at beginners in the fields of protocol engineering, ad hoc networks or intelligent transport systems, but also provides specialists with an original perspective on the scientific literature in these fields. In particular, it offers concrete tools to help them develop their own methods for designing and evaluating communications protocols.
Author: Abderrahim Makhlouf
Publisher:
ISBN:
Category :
Languages : fr
Pages : 167
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Book Description
Avec l'émergence des applications multimédia dans les réseaux Ad-Hoc, des garanties de la qualité de service (QoS) sont de plus en plus exigées. Le premier obstacle à franchir consiste à connaître l'état du réseau en terme de délai ou de bande passante, que ce soit par la modélisation ou par le biais de mesures. Dans le cadre de cette thèse, nous nous sommes intéressés à l'étude de l'équité dans des réseaux Ad-Hoc basés sur le protocole 802.11. Nous les avons tous d'abord modélisé et ensuite déduit les services offrant de la QoS. Dans un réseau Ad-Hoc, les communications fonctionnent en mode semi-duplex et les nœuds peuvent interférer. Dans ce contexte, les nœuds du réseau Ad-Hoc n'offrent pas un accès équitable aux ressources du réseau. L'allocation équitable des ressources est alors étudiée pour l'ensemble des nœuds dans un réseau en étoile.Nous nous sommes centrés sur l'équité au sein du réseau et sur les paquets reçus par chaque nœud. L'équité est évaluée pour des topologies de réseaux statiques appelé réseau simple étoile ou réseau double étoile. L'objectif est d'analyser le nombre de paquets reçus par chaque nœud et par conséquent le comportement de l'équité. Grâce au simulateur NS2, nous avons validé notre modèle analytique. Nous avons implémenté différents protocoles et étudié leurs performances en terme de service. L'équité est alors mesurée par un facteur de mesure appelé indice d' Pour les réseaux simple étoile, nous avons contrôlé la réception des paquets, ce qui nous a permis d'avoir une équité au sein de ce réseau et pour les réseaux double étoile nous avons pu établir un encadrement de l'indice de l'équité dans certains cas.
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: Norbert Streitz
Publisher: Springer
ISBN: 3540727272
Category : Computers
Languages : en
Pages : 314
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Book Description
This book examines how the computer, as we currently know it, will be replaced by a new generation of technologies, moving computing off the desktop and ultimately integrating it with real world objects and everyday environments. It provides a unique combination of concepts, methods and prototypes of ubiquitous and pervasive computing reflecting the current interest in smart environments and ambient intelligence.
Author: Xavier Begaud
Publisher: John Wiley & Sons
ISBN: 1118586573
Category : Technology & Engineering
Languages : en
Pages : 217
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Book Description
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.
Author: Alain Sibille
Publisher: Academic Press
ISBN: 0123821959
Category : Technology & Engineering
Languages : es
Pages : 385
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Book Description
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)
Author: Roberto Verdone
Publisher: Springer Science & Business Media
ISBN: 144712314X
Category : Computers
Languages : en
Pages : 696
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Book Description
Reporting the findings of COST 2100, a major European intergovernmental project, this volume offers system designers a good source of guidelines based on channel characterization and measurement-based modeling, as well as worthwhile ideas for future research.
Author: Nicolas Gillis
Publisher: SIAM
ISBN: 1611976413
Category : Mathematics
Languages : en
Pages : 376
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Book Description
Nonnegative matrix factorization (NMF) in its modern form has become a standard tool in the analysis of high-dimensional data sets. This book provides a comprehensive and up-to-date account of the most important aspects of the NMF problem and is the first to detail its theoretical aspects, including geometric interpretation, nonnegative rank, complexity, and uniqueness. It explains why understanding these theoretical insights is key to using this computational tool effectively and meaningfully. Nonnegative Matrix Factorization is accessible to a wide audience and is ideal for anyone interested in the workings of NMF. It discusses some new results on the nonnegative rank and the identifiability of NMF and makes available MATLAB codes for readers to run the numerical examples presented in the book. Graduate students starting to work on NMF and researchers interested in better understanding the NMF problem and how they can use it will find this book useful. It can be used in advanced undergraduate and graduate-level courses on numerical linear algebra and on advanced topics in numerical linear algebra and requires only a basic knowledge of linear algebra and optimization.
Author: Michael Möser
Publisher: Springer Science & Business Media
ISBN: 3540927239
Category : Technology & Engineering
Languages : en
Pages : 540
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Book Description
Suitable for both individual and group learning, Engineering Acoustics focuses on basic concepts and methods to make our environments quieter, both in buildings and in the open air. The author’s tutorial style derives from the conviction that understanding is enhanced when the necessity behind the particular teaching approach is made clear. He also combines mathematical derivations and formulas with extensive explanations and examples to deepen comprehension. Fundamental chapters on the physics and perception of sound precede those on noise reduction (elastic isolation) methods. The last chapter deals with microphones and loudspeakers. Moeser includes major discoveries by Lothar Cremer, including the optimum impedance for mufflers and the coincidence effect behind structural acoustic transmission. The appendix gives a short introduction on the use of complex amplitudes in acoustics.
Author: Philip N. Howard
Publisher: SAGE
ISBN: 9780761927082
Category : Computers
Languages : en
Pages : 388
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Book Description
'Society Online' is not exclusively devoted to a particular technology, or specifically the Internet, but to a range of technologies and technological possibilities labelled 'new media'.
