Download or read book Approche pour l ordonnancement distribu de workflows dans le contexte d entreprises virtuelles written by Sebastian Kanzow and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Les workflows inter-organisationnels sont soumis à des contraintes particulières : leur nature distribuée exclut toute gestion centralisée, pour des raisons de confidentialité et déchelle. Nous développons une méthodologie multi-agents, pour l'ordonnancement distribué dynamique de tâches assujetties à des contraintes temporelles et de ressources. L'algorithme d'ordonnancement est basé sur un calcul dynamique de la priorité des tâches. La confidentialité est respectée, en limitant les informations échangées à des valeurs probabilistes. L'architecture s'appuie sur la mobilité d’agents chargés de l'exécution des tâches et sur la gestion réactive des ressources, où des perturbations sont absorbées implicitement. Nous définissons le protocole de négociation entre les agents et deux heuristiques pour l'allocation et l'ordonnancement de tâches.
Download or read book CoopFlow written by Issam Chebbi and published by . This book was released on 2007 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'évolution et l'automatisation des procédés d'entreprise ont favorisé l'émergence d'une concurrence plus intensive menant les entreprises à restructurer leurs procédés et leurs partenariats en mettant en commun leurs compétences respectives afin de réaliser des projets complexes qui ne sont pas à la portée d'une seule entreprise. On parle alors de coopération de workflows ou de workflows interentreprises. Force est de constater que les solutions proposées pour supporter les workflows inter-entreprises soit ne respectent pas le savoir-faire des entreprises, soit n'intègrent pas leurs workflows existants, soit ne préservent pas les systèmes de gestion de workflows pré-établis. Cette thèse s'intéresse à la coopération spontanée et dynamique des workflows interentreprises hétérogènes qui respecte leurs savoir-faire et préserve leurs workflows et systèmes de gestion de workflows existants. Afin d'atteindre cet objectif, nous proposons CoopFlow une nouvelle approche pour la coopération de workflows interentreprises permettant la publication, l'interconnexion et la coopération de workflows. Les entreprises commencent par publier leurs workflows au sein d'un annuaire. Pour préserver leurs savoir-faire et leur permettre de garder un certain degré de confidentialité et de sécurité de leurs workflows internes, nous proposons une procédure d'abstraction de workflow permettant une visibilité partielle des workflows des partenaires et de n'exposer à l'extérieur que les parties de leurs workflows jouant un rôle direct dans la coopération. La seconde étape de CoopFlow consiste à interconnecter des workflows existants de partenaires avec des compétences complémentaires grâce à une procédure de correspondance permettant de vérifier s'il existe des comportements communs des workflows de partenaires. Enfin, la dernière étape de CoopFlow consiste à contrôler et à surveiller la coopération de workflows interentreprises. Pour ce faire, nous avons développé une plateforme pour gérer l'interopérabilité au niveau système en intégrant les systèmes de gestion de workflows pré-établis. Deux architectures de coopération en fonction du degré de confiance entre les partenaires ont été définies: une architecture avec un contrôle centralisé lorsqu'il n'existe pas suffisamment de confiance entre les participants et une architecture distribuée lorsqu'il existe une certaine confiance entre les entreprises. Nous avons validé les solutions proposées à l'aide d'un prototype intégrant trois systèmes de gestion de workflows ouverts et hétérogènes.
Download or read book Approche pour l ordonnancement distribu de workflows written by Sebastian Kanzow and published by . This book was released on 2020-03-30 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Signal Processing for Communications written by Paolo Prandoni and published by Collection Savoir suisse. This book was released on 2008-06-17 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a novel, less classical approach to the subject, the authors have written a book with the conviction that signal processing should be taught to be fun. The treatment is therefore less focused on the mathematics and more on the conceptual aspects, the idea being to allow the readers to think about the subject at a higher conceptual level, thus building the foundations for more advanced topics. The book remains an engineering text, with the goal of helping students solve real-world problems. In this vein, the last chapter pulls together the individual topics as discussed throughout the book into an in-depth look at the development of an end-to-end communication system, namely, a modem for communicating digital information over an analog channel.
Download or read book Quantum Communications and Cryptography written by Alexander V. Sergienko and published by CRC Press. This book was released on 2018-10-03 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
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.
Download or read book Complex Systems Engineering written by Shannon Flumerfelt and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents state-of-the-art thought leadership on system complexity for aerospace and aviation, where breakthrough paradigms and strategies are sorely needed. The breadth of topics covered provide an enriched view of all types of systems-technical, machine, and human systems - to both practitioners and academics.
Download or read book The Physics of Information Technology written by Neil Gershenfeld and published by Cambridge University Press. This book was released on 2000-10-16 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physics of Information Technology explores the familiar devices that we use to collect, transform, transmit, and interact with electronic information. Many such devices operate surprisingly close to very many fundamental physical limits. Understanding how such devices work, and how they can (and cannot) be improved, requires deep insight into the character of physical law as well as engineering practice. The book starts with an introduction to units, forces, and the probabilistic foundations of noise and signalling, then progresses through the electromagnetics of wired and wireless communications, and the quantum mechanics of electronic, optical, and magnetic materials, to discussions of mechanisms for computation, storage, sensing, and display. This self-contained volume will help both physical scientists and computer scientists see beyond the conventional division between hardware and software to understand the implications of physical theory for information manipulation.
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)
Download or read book A Short Introduction to Quantum Information and Quantum Computation written by Michel Le Bellac and published by Cambridge University Press. This book was released on 2006-06-15 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum information and computation is a rapidly expanding and cross-disciplinary subject. This book, first published in 2006, gives a self-contained introduction to the field for physicists, mathematicians and computer scientists who want to know more about this exciting subject. After a step-by-step introduction to the quantum bit (qubit) and its main properties, the author presents the necessary background in quantum mechanics. The core of the subject, quantum computation, is illustrated by a detailed treatment of three quantum algorithms: Deutsch, Grover and Shor. The final chapters are devoted to the physical implementation of quantum computers, including the most recent aspects, such as superconducting qubits and quantum dots, and to a short account of quantum information. Written at a level suitable for undergraduates in physical sciences, no previous knowledge of quantum mechanics is assumed, and only elementary notions of physics are required. The book includes many short exercises, with solutions available to instructors through [email protected].
Download or read book Pervasive Mobile and Ambient Wireless Communications written by Roberto Verdone and published by Springer Science & Business Media. This book was released on 2012-01-02 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Foundations of Signal Processing written by Martin Vetterli and published by Cambridge University Press. This book was released on 2014-09-04 with total page 745 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive and engaging textbook introduces the basic principles and techniques of signal processing, from the fundamental ideas of signals and systems theory to real-world applications. Students are introduced to the powerful foundations of modern signal processing, including the basic geometry of Hilbert space, the mathematics of Fourier transforms, and essentials of sampling, interpolation, approximation and compression The authors discuss real-world issues and hurdles to using these tools, and ways of adapting them to overcome problems of finiteness and localization, the limitations of uncertainty, and computational costs. It includes over 160 homework problems and over 220 worked examples, specifically designed to test and expand students' understanding of the fundamentals of signal processing, and is accompanied by extensive online materials designed to aid learning, including Mathematica® resources and interactive demonstrations.
Download or read book Cryptographic Hardware and Embedded Systems CHES 2001 written by CHES 2001 and published by Springer Science & Business Media. This book was released on 2001-08-15 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-proceedings of the Third International Workshop on Cryptoanalysis Hardware and Embedded Systems, CHES 2001, held in Paris, France in Mai 2001. The 31 revised full papers presented were carefully reviewed and selected from 66 submissions. The papers are organized in topical sections on side channel attacks, Rijndael hardware implementation, random number generators, elliptic curve algorithms, arithmetic architectures, cryptanalysis, embedded implementations of ciphers, and side channel attacks on elliptic curve cryptosystems.
Download or read book Principles of Digital Communication written by Bixio Rimoldi and published by Cambridge University Press. This book was released on 2016-01-21 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive text that takes a unique top-down approach to teaching the fundamentals of digital communication for a one-semester course.
Download or read book Automatic Text Summarization written by Juan-Manuel Torres-Moreno and published by John Wiley & Sons. This book was released on 2014-11-10 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Textual information in the form of digital documents quickly accumulates to create huge amounts of data. The majority of these documents are unstructured: it is unrestricted text and has not been organized into traditional databases. Processing documents is therefore a perfunctory task, mostly due to a lack of standards. It has thus become extremely difficult to implement automatic text analysis tasks. Automatic Text Summarization (ATS), by condensing the text while maintaining relevant information, can help to process this ever-increasing, difficult-to-handle, mass of information. This book examines the motivations and different algorithms for ATS. The author presents the recent state of the art before describing the main problems of ATS, as well as the difficulties and solutions provided by the community. The book provides recent advances in ATS, as well as current applications and trends. The approaches are statistical, linguistic and symbolic. Several examples are also included in order to clarify the theoretical concepts.
Download or read book Vehicular Social Networks written by Anna Maria Vegni and published by CRC Press. This book was released on 2017-03-31 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a comprehensive guide to vehicular social networks. The book focuses on a new class of mobile ad hoc networks that exploits social aspects applied to vehicular environments. Selected topics are related to social networking techniques, social-based routing techniques applied to vehicular networks, data dissemination in VSNs, architectures for VSNs, and novel trends and challenges in VSNs. It provides significant technical and practical insights in different aspects from a basic background on social networking, the inter-related technologies and applications to vehicular ad-hoc networks, the technical challenges, implementation and future trends.
Download or read book Engineering Acoustics written by Michael Möser and published by Springer Science & Business Media. This book was released on 2009-09-01 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
