Clusterisation et conservation d'énergie dans les réseaux ad hoc hybrides à grande échelle PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Clusterisation et conservation d'énergie dans les réseaux ad hoc hybrides à grande échelle PDF full book. Access full book title Clusterisation et conservation d'énergie dans les réseaux ad hoc hybrides à grande échelle by Imen Jemili. Download full books in PDF and EPUB format.
Author: Imen Jemili
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
Get Book Here
Book Description
Dans le cadre des réseaux ad hoc à grande envergure, le concept de clusterisation peut être mis à profit afin de faire face aux problèmes de passage à l'échelle et d'accroître les performances du système. Tout d'abord, cette thèse présente notre algorithme de clusterisation TBCA 'Tiered based Clustering algorithm', ayant pour objectif d'organiser le processus de clusterisation en couches et de réduire au maximum le trafic de contrôle associé à la phase d'établissement et de maintenance de l'infrastructure virtuelle générée. La formation et la maintenance d'une infrastructure virtuelle ne sont pas une fin en soi. Dans cet axe, on a exploité les apports de notre mécanisme de clusterisation conjointement avec le mode veille, à travers la proposition de l'approche de conservation d'énergie baptisée CPPCM 'Cluster based Prioritized Power Conservation Mechanism' avec deux variantes. Notre objectif principal est de réduire la consommation d'énergie tout en assurant l'acheminement des paquets de données sans endurer des temps d'attente importants aux niveaux des files d'attente des nœuds impliqués dans le transfert. Nous avons proposé aussi un algorithme de routage LCR 'Layered Cluster based Routing' se basant sur l'existence d'une infrastructure virtuelle. L'exploitation des apports de notre mécanisme TBCA et la limitation des tâches de routage additionnelles à un sous ensemble de nœuds sont des atouts pour assurer le passage à l'échelle de notre algorithme.
Author: Imen Jemili
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
Get Book Here
Book Description
Dans le cadre des réseaux ad hoc à grande envergure, le concept de clusterisation peut être mis à profit afin de faire face aux problèmes de passage à l'échelle et d'accroître les performances du système. Tout d'abord, cette thèse présente notre algorithme de clusterisation TBCA 'Tiered based Clustering algorithm', ayant pour objectif d'organiser le processus de clusterisation en couches et de réduire au maximum le trafic de contrôle associé à la phase d'établissement et de maintenance de l'infrastructure virtuelle générée. La formation et la maintenance d'une infrastructure virtuelle ne sont pas une fin en soi. Dans cet axe, on a exploité les apports de notre mécanisme de clusterisation conjointement avec le mode veille, à travers la proposition de l'approche de conservation d'énergie baptisée CPPCM 'Cluster based Prioritized Power Conservation Mechanism' avec deux variantes. Notre objectif principal est de réduire la consommation d'énergie tout en assurant l'acheminement des paquets de données sans endurer des temps d'attente importants aux niveaux des files d'attente des nœuds impliqués dans le transfert. Nous avons proposé aussi un algorithme de routage LCR 'Layered Cluster based Routing' se basant sur l'existence d'une infrastructure virtuelle. L'exploitation des apports de notre mécanisme TBCA et la limitation des tâches de routage additionnelles à un sous ensemble de nœuds sont des atouts pour assurer le passage à l'échelle de notre algorithme.
Author: Imen Jemili
Publisher: Omniscriptum
ISBN: 9786131545337
Category :
Languages : fr
Pages : 180
Get Book Here
Book Description
Ce travail comprend deux volets essentiels. Dans le premier, une étude des approches de clusterisation existantes a permis d'établir une classification des approches se basant sur la notion de domination de graphe. Dans cet axe, un mécanisme de clusterisation, prenant en considération les spécificités et caractéristiques du médium sans fil, a été proposé. Le deuxième volet s'intéresse à l'exploitation de l'infrastructure virtuelle générée par le mécanisme de clusterisation, en abordant la problématique de conservation d'énergie. Une présentation des approches existantes a permis de focaliser sur les mécanismes ayant exploité le mode veille et une technique de clusterisation. Une évaluation de performance a permis de montrer l'importance du choix du mécanisme de clusterisation dans ces solutions et de proposer une nouvelle approche basée sur l'exploitation des apports de la clusterisation et du mode veille, dont l'objectif principal est de réduire la consommation d'énergie tout en assurant l'acheminement des paquets de données sans endurer des temps d'attente importants aux niveaux des files d'attente des noeuds impliqués dans le transfert.
Author: Denise Pumain
Publisher: Springer Science & Business Media
ISBN: 1402041276
Category : Business & Economics
Languages : en
Pages : 248
Get Book Here
Book Description
Hierarchy is a form of organisation of complex systems that rely on or produce a strong differentiation in capacity (power and size) between the parts of the system. It is frequently observed within the natural living world as well as in social institutions. According to the authors, hierarchy results from random processes, follows an intentional design, or is the result of the organisation which ensures an optimal circulation of energy for information. This book reviews ancient and modern representations and explanations of hierarchies, and compares their relevance in a variety of fields, such as language, societies, cities, and living species. It throws light on concepts and models such as scaling laws, fractals and self-organisation that are fundamental in the dynamics and morphology of complex systems. At a time when networks are celebrated for their efficiency, flexibility and better social acceptance, much can be learned about the persistent universality and adaptability of hierarchies, and from the analogies and differences between biological and social organisation and processes. This book addresses a wide audience of biologists and social scientists, as well as managers and executives in a variety of institutions.
Author: Jean-Claude Bolay
Publisher: Springer
ISBN: 3319317946
Category : Social Science
Languages : en
Pages : 241
Get Book Here
Book Description
This book deals with slums as a specific question and a central focus in urban planning. It radically reverses the official version of the history of world cities as narrated during decades: slums are not at the margin of the contemporary process of urbanization; they are an integral part of it. Taking slums as its central focus and regarding them as symptomatic of the ongoing transformations of the city, the book moves to the very heart of the problem in urban planning. The book presents 16 case studies that form the basis for a theory of the slum and a concrete development manual for the slum. The interdisciplinary approach to analysing slums presented in this volume enables researchers to look at social and economic dimensions as well as at the constructive and spatial aspects of slums. Both at the scientific and the pedagogical level, it allows one to recognize the efforts of the slum’s residents, key players in the past, and present development of their neighborhoods, and to challenge public and private stakeholders on priorities decided in urban planning, and their mismatches when compared to the findings of experts and the demands of users. Whether one is a planner, an architect, a developer or simply an inhabitant of an emerging city, the presence of slums in one’s environment – at the same time central and nonetheless incongruous – makes a person ask questions. Today, it is out of the question to be satisfied with the assumption of the marginality of slums, or of the incongruous nature of their existence. Slums are now fully part of the urban landscape, contributing to the identity and the urbanism of cities and their stakeholders.
Author: Jean-Philippe Deguine
Publisher: Springer
ISBN: 9402411852
Category : Technology & Engineering
Languages : en
Pages : 276
Get Book Here
Book Description
This book is devoted to Agroecological Crop Protection, which is the declension of the principles of agroecology to crop protection. It presents the concepts of this innovative approach, case studies and lessons and generic keys for agroecological transition. The book is intended for a wide audience, including scientists, experimenters, teachers, farmers, students. It represents a new tool, proposing concrete keys of action on the basis of feedbacks validated scientifically. Beyond the examples presented, it is therefore of general scope and proposes recommendations for all temperate and tropical cropping systems. It contributes to the training and teaching modules in this field and it is an updated information support for professionals and a teaching aid for students (agronomy, crop protection, biodiversity management, agroecology).
Author: Romain Boulet
Publisher: Springer
ISBN: 3030115062
Category : Law
Languages : en
Pages : 280
Get Book Here
Book Description
This book investigates how various scientific communities – e.g. legal scientists, political scientists, sociologists, mathematicians, and computer scientists – study law and public policies, which are portrayed here as complex systems. Today, research on law and public policies is rapidly developing at the international level, relying heavily on modeling that employs innovative methods for concrete implementation. Among the subject matter discussed, law as a network of evolving and interactive norms is now a prominent sphere of study. Similarly, public policies are now a topic in their own right, as policy can no longer be examined as a linear process; rather, its study should reflect the complexity of the networks of actors, norms and resources involved, as well as the uncertainty or weak predictability of their direct or indirect impacts. The book is divided into three maain parts: complexity faced by jurists, complexity in action and public policies, and complexity and networks. The main themes examined concern codification, governance, climate change, normative networks, health, water management, use-related conflicts, legal regime conflicts, and the use of indicators.
Author: Marcel Boyer
Publisher:
ISBN: 9781552211656
Category : Law
Languages : en
Pages : 476
Get Book Here
Book Description
Papers and commentaries orginally presented at a March 2007 symposium held in Ottawa, Ont.
Author: Nils Braun-Dubler
Publisher: vdf Hochschulverlag AG
ISBN: 3728140163
Category : Technology & Engineering
Languages : en
Pages : 384
Get Book Here
Book Description
Blockchain is widely considered a new key technology. The Foundation for Technology Assessment (TA-SWISS) has proposed a comprehensive assessment of blockchain technologies. With this publication, TA-SWISS provides the much-needed social contextualisation of blockchain. The first, more technical part of the study takes an in-depth look at how blockchain functions and examines the economic potential of this technology. By analysing multiple real-world applications, the study sheds light on where the blockchain has advantages over traditional applications and where existing technologies continue to be the better solution. The second part of the study examines how blockchain became mainstream. It explores the origins of blockchain in the early history of information technology and computer networks. The study also reveals the impact blockchain has on industrial and public spaces. Finally, it discusses the social implications and challenges of blockchain against the background of a new socio-technical environment.
Author: Emmanuel Rey
Publisher: Springer Nature
ISBN: 3030822087
Category : Science
Languages : en
Pages : 257
Get Book Here
Book Description
This open access book is focused on the intersection between urban brownfields and the sustainability transitions of metreopolitan areas, cities and neighbourhoods. It provides both a theoretical and practical approach to the topic, offering a thorough introduction to urban brownfields and regeneration projects as well as an operational monitoring tool. Neighbourhoods in Transition begins with an overview of historic urban development and strategic areas in the hearts of towns to be developed. It then defines several key issues related to the topic, including urban brownfields, regeneration projects, and sustainability issues related to neighbourhood development. The second part of this book is focused on support tools, explaining the challenges faced, the steps involved in a regeneration process, and offering an operational monitoring tool. It applies the unique tool to case studies in three selected neighbourhoods and the outcomes of one case study are also presented and discussed, highlighting its benefits. The audience for this book will be both professional and academic. It will support researchers as an up-to-date reference book on urban brownfield regeneration projects, and also the work of architects, urban designers, urban planners and engineers involved in sustainability transitions of the built environment.
Author: Roussos Dimitrakopoulos
Publisher: Springer Science & Business Media
ISBN: 9401108242
Category : Science
Languages : en
Pages : 513
Get Book Here
Book Description
To honour the remarkable contribution of Michel David in the inception, establishment and development of Geostatistics, and to promote the essence of his work, an international Forum entitled Geostatistics for the Next Century was convened in Montreal in June 1993. In order to enhance communication and stimulate geostatistical innovation, research and development, the Forum brought together world leading researchers and practitioners from five continents, who discussed-debated current problems, new technologies and futuristic ideas. This volume contains selected peer-reviewed papers from the Forum, together with comments by participants and replies by authors. Although difficult to capture the spontaneity and range of a debate, comments and replies should further assist in the promotion of ideas, dialogue and criticism, and are consistent with the spirit of the Forum. The contents of this volume are organized following the Forum's thematic sessions. The role of theme sessions was not only to stress important topics of tOday but in addition, to emphasize common ground held among diverse areas of geostatistical work and the need to strengthen communication between these areas. For this reason, any given section of this book may include papers from theory to applications, in mining, petroleum, environment, geohydrology, image processing.
