Download or read book Contributions l ordonnancement et l analyse des syst mes temps r el critiques written by François Dorin and published by . This book was released on 2010 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans nos travaux, nous nous sommes intéressés aux politiques d'ordonnancement en-ligne, pour lesquelles l'ordre d'exécution des tâches est déterminé sur la base des tâches actives dans le système et sans connaissance a priori des tâches qui arriveront dans le futur. Cette problématique s'étend aux réseaux informatiques pour ordonnancer les messages sur le réseau informatique interconnectant les différents calculateurs du système temps réel. La première contribution concerne le placement et ordonnancement simultanés des tâches dans un système temps réel distribué, permettant de minimiser le nombre de processeurs nécessaires pour respecter les spécifications temporelles des tâches. La seconde contribution concerne les tâches à criticité multiple. L'objectif de ce modèle est de prendre en compte la notion de criticité des différentes tâches, comme par exemple dans la norme DO-178B utilisée en aéronautique. Enfin, nous nous sommes intéressés aux systèmes multiprocesseurs ordonnancés par des algorithmes d'ordonnancement semi-partitionné. Cette classe d'algorithme utilise une stratégie par partitionnement pour répartir les tâches parmi les processeurs tout en autorisant la migration des tâches qui ne peuvent pas être actées à un processeur donné sans violation d'échéance.

Download or read book Ordonnancement en ligne temps r el critique dans les syst mes distribues written by Laurent George and published by . This book was released on 1998 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les systèmes distribués temps réel critique sont des systèmes distribués bien spécifiques pour lesquels les techniques d'analyse en moyenne avec ou sans simulation ne sont pas satisfaisantes. Il est nécessaire de garantir que tout au long de la vie du système, les contraintes temporelles associées aux tâches exécutées dans le système seront toujours respectées. A ces contraintes temporelles sont le plus souvent associées des contraintes de haute disponibilité des services fournis par le système. Contraintes pour lesquelles il est nécessaire de mettre en oeuvre des techniques de tolérance aux fautes particulières. Nous nous intéressons aux problèmes de conception et dimensionnement de systèmes ou se conjuguent les problèmes de temps réel, de traitement distribué et de tolérance aux fautes (trdf). Cette thèse montre comment il est possible d'étendre des résultats d'ordonnancement établis en contexte monoprocesseur centralise pour résoudre deux problèmes trdf. nous étudions plus particulièrement les politiques d'ordonnancement à bases de priorités fixes (rate monotonic, deadline monotonic ou arbitraire) et dynamiques (earliest deadline first, fifo notamment) en contexte préemptif et non préemptif. Les différents résultats établis en contexte non préemptif centralise sont ensuite étendus pour résoudre les deux problèmes trdf suivants : diffusion temps réel dans un groupe : (multicast) nous décrivons une famille de protocoles de diffusion atomique uniforme avec un temps de réponse de bout en bout borne. La famille de protocoles utilise l'ordonnancement earliest deadline first (edf). traitement reparti temps réel : Nous traitons un problème d'algorithmique distribuée avec maintien de relation d'ordre (l'ordre d'occurrence des évènements). Nous montrons comment maintenir la cohérence de données reparties en présence d'accès concurrents avec un temps de réponse garanti. Une analyse de faisabilité associée a l'ordonnancement FIFO est réalisée. Cette analyse est basée sur le calcul du pire temps de réponse des tâches du système.

Download or read book Contribution la planification et l ordonnancement de syst mes flexibles de production sujets pannes written by Olivier De Smet and published by . This book was released on 1995 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans ce mémoire, on étudie le problème de la gestion de systèmes de production sujets à pannes. Les approches utilisant une structure de commande hiérarchisée font apparaitre les niveaux planification et ordonnancement, mais elles prennent rarement en compte les pannes des le niveau de la planification. Nous proposons une nouvelle approche basée sur une structure de commande hiérarchisée utilisant un modèle à flux pour la partie planification et une méthode de recherche par faisceaux pour la partie ordonnancement. Le modèle a flux propose permet d'intégrer les pannes des l'équation d'évolution par l'utilisation de sauts markoviens décrivant l'évolution du système entre ses différents états possibles. On associe alors une fonction cout quadratique exprimant différents couts (de stockage, de production) et en partie les contraintes de capacités du système. La résolution du problème de commande optimale ainsi obtenu conduit a un ensemble d'équations matricielles couplées de type Riccati. Nous donnons alors une condition nécessaire et suffisante pour l'existence d'une solution. Nous proposons aussi un algorithme de résolution permettant d'obtenir les taux de production optimaux pour chaque type de produits dans tous les modes du systeme. Le combinatoire pour la production de pièces sur un systeme flexible pouvant devenir exagéré, nous introduisons un concept de filières permettant de réduire la taille du problème tout en conservant une relative flexibilité pour son fonctionnement. L'ordonnancement de la production sur des systemes de ce type nécessite une réaction rapide, c'est pourquoi nous proposons un ordonnancement temps réel base sur une recherche par faisceaux permettant de suivre au mieux les taux calcules par le niveau planification. Pour valider notre approche, une maquette informatique écrite en langage c a été développée et permet de simuler l'évolution d'un système de production. Deux exemples de systèmes sont traités, l'un compose de 9 machines avec 6 produits et l'autre de 6 machines et 3 produits.

Download or read book Ordonnancement en ligne temps reel critique dans les systemes distribues written by Laurent George and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Real time Systems and Their Programming Languages written by Alan Burns and published by Addison Wesley Publishing Company. This book was released on 1990 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey of real-time systems and the programming languages used in their development. Shows how modern real-time programming techniques are used in a wide variety of applications, including robotics, factory automation, and control. A critical requirement for such systems is that the software must

Download or read book Organizational Decision Making written by Zur Shapira and published by Cambridge University Press. This book was released on 2002-03-25 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores decision making in organizations, highlighting the roles of incentive, conflict, power and politics.

Download or read book Conservation Regeneration the Modernist Neighbourhood written by and published by . This book was released on 2012 with total page 807 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aiding Decisions with Multiple Criteria written by Denis Bouyssou and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aiding Decisions With Multiple Criteria: Essays in Honor of Bernard Roy is organized around two broad themes: Graph Theory with path-breaking contributions on the theory of flows in networks and project scheduling, Multiple Criteria Decision Aiding with the invention of the family of ELECTRE methods and methodological contribution to decision-aiding which lead to the creation of Multi-Criteria Decision Analysis (MCDA). Professor Bernard Roy has had considerable influence on the development of these two broad areas. £/LIST£ Part one contains papers by Jacques Lesourne, and Dominique de Werra & Pierre Hansen related to the early career of Bernard Roy when he developed many new techniques and concepts in Graph Theory in order to cope with complex real-world problems. Part two of the book is devoted to Philosophy and Epistemology of Decision-Aiding with contributions from Valerie Belton & Jacques Pictet and Jean-Luis Genard & Marc Pirlot. Part three includes contributions based on Theory and Methodology of Multi-Criteria Decision-Aiding based on a general framework for conjoint measurement that allows intrasitive preferences. Denis Bouyssou & Marc Pirlot; Alexis Tsoukiàs, Patrice Perny & Philippe Vincke; Luis Dias & João Clímaco; Daniel Vanderpooten; Michael Doumpos & Constantin Zopounidis; and Marc Roubens offer a considerable range of examinations of this aspect of MCDA. Part four is devoted to Perference Modeling with contributions from Peter Fishburn; Salvatore Greco, Benedetto Matarazzo & Roman Slowinski; Salem Benferhat, Didier Dubois & Henri Prade; Oscar Franzese & Mark McCord; Bertrand Munier; and Raymond Bisdorff. Part five groups Applications of Multi-Criteria Decision-Aiding, and Carlos Henggeler Antunes, Carla Oliveira & João Clímaco; Carlos Bana e Costa, Manuel da Costa-Lobo, Isabel Ramos & Jean-Claude Vansnick; Yannis Siskos & Evangelos Grigoroudis; Jean-Pierre Brans, Pierre Kunsch & Bertrand Mareschal offer a wide variety of application problems. Finally, Part six includes contributions on Multi-Objective Mathematical Programming from Jacques Teghem, Walter Habenicht and Pekka Korhonen.

Download or read book Philosophy manual a South South perspective written by Chanthalangsy, Phinith and published by UNESCO Publishing. This book was released on 2014-12-31 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Building Parallel Embedded and Real Time Applications with Ada written by John W. McCormick and published by Cambridge University Press. This book was released on 2011-04-07 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: The arrival and popularity of multi-core processors has sparked a renewed interest in the development of parallel programs. Similarly, the availability of low-cost microprocessors and sensors has generated a great interest in embedded real-time programs. This book provides students and programmers whose backgrounds are in traditional sequential programming with the opportunity to expand their capabilities into parallel, embedded, real-time and distributed computing. It also addresses the theoretical foundation of real-time scheduling analysis, focusing on theory that is useful for actual applications. Written by award-winning educators at a level suitable for undergraduates and beginning graduate students, this book is the first truly entry-level textbook in the subject. Complete examples allow readers to understand the context in which a new concept is used, and enable them to build and run the examples, make changes, and observe the results.

Download or read book Computer Integrated Manufacturing written by Kiyoji Asai and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Current state of expectations is that Computer Integrated Manufacturing (CIM) will ulti mately determine the industrial growth of world nations within the next few decades. Computer Aided Design (CAD), Computer Aided Manufacturing (CAM), Flexible Manufacturing Systems (FMS), Robotics together with Knowledge and Information Based Systems (KIBS) and Com munication Networks are expected to develop to a mature state to respond effectively to the managerial requirements of the factories of the future that are becoming highly integrated and complex. CIM represents a new production approach which will allow the factories to deliver a high variety of products at a low cost and with short production cycles. The new technologies for CIM are needed to develop manufacturing environments that are smarter, faster, close-cou pled, integrated, optimized, and flexible. Sophistication and a high degree of specialization in materials science, artificial intelligence, communications technology and knowledge-information science techniques are needed among others for the development of realizable and workable CIM systems that are capable of adjusting to volatile markets. CIM factories are to allow the production of a wide variety of similar products in small batches through standard but multi mission oriented designs that accommodate flexibility with specialized software.

Download or read book Secession written by Marcelo G. Kohen and published by Cambridge University Press. This book was released on 2006-03-21 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive study of secession from an international law perspective.

Download or read book Managing Interdisciplinary Projects written by Stephen Emmitt and published by Routledge. This book was released on 2010-04-26 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Construction, architecture and engineering projects are complex undertakings, involving a temporary grouping of people and companies, with different agendas and experience, coming together to achieve a project goal. This book investigates the dynamics of the relationships between individuals involved in architecture, engineering and construction projects. It combines a structured theoretical framework, derived from social psychology and mainstream management theory, with case studies and research from the built environment sector. Focusing on how people interact, communicate and work together, it examines how best to manage the interdisciplinary relationships that form and reform during the project life cycle. The book covers vital areas of project management, whose importance has recently come to be recognized, and will be valuable for students at both undergraduate and graduate level. Practitioners will also find it a useful insight into the social aspect of project management, with implications and applications that apply to all projects in the built environment sector.

Download or read book The Resilient Enterprise written by Yossi Sheffi and published by MIT Press. This book was released on 2007-02-23 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stories from Nokia, Dell, UPS, Toyota, and other companies show how firms can reduce their vulnerability to high-impact distributions, from earthquakes to strikes, from SARS to terrorism, and use them for competitive advantage. What happens when fire strikes the manufacturing plant of the sole supplier for the brake pressure valve used in every Toyota? When a hurricane shuts down production at a Unilever plant? When Dell and Apple chip manufacturers in Taiwan take weeks to recover from an earthquake? When the U.S. Pacific ports are shut down during the Christmas rush? When terrorists strike? In The Resilient Enterprise, Yossi Sheffi shows that companies' fortunes in the face of such business shocks depend more on choices made before the disruption than they do on actions taken in the midst of it—and that resilience benefits firms every day, disaster or no disaster. He shows how companies can build in flexibility throughout their supply chains, based on proven design principles and the right culture—balancing security, redundancy, and short-term profits. And he shows how investments in resilience and flexibility not only reduce risk but create a competitive advantage in the increasingly volatile marketplace.Sheffi describes the way companies can increase security—reducing the likelihood of a disruption—with layered defenses, the tracking and analysis of “near-misses,” fast detection, and close collaboration with government agencies, trading partners, and even competitors. But the focus of the book is on resilience—the ability to bounce back from disruptions and disasters—by building in redundancy and flexibility. For example, standardization, modular design, and collaborative relationships with suppliers (and other stakeholders) can help create a robust supply chain. And a corporate culture of flexibility—with distributed decision making and communications at all levels—can create a resilient enterprise.Sheffi provides tools for companies to reduce the vulnerability of the supply chain they live in. And along the way he tells the stories of dozens of enterprises, large and small, including Toyota, Nokia, General Motors, Zara, Land Rover, Chiquita, Aisin Seiki, Southwest Airlines, UPS, Johnson and Johnson, Intel, Amazon.com, the U.S. Navy, and others, from across the globe. Their successes, failures, preparations, and methods provide a rich set of lessons in preparing for and managing disruptions. Additional material available at www.TheResilientEnterprise.com.

Download or read book ENTERprise Information Systems Part I written by Joao Eduardo Quintela Varajao and published by Springer. This book was released on 2010-12-02 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the proceedings of the International Conference on ENTERprise information systems, held Viana do Castelo, Portugal, in October 2010.

Download or read book The Second Century written by Matthias Holweg and published by MIT Press (MA). This book was released on 2004 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: How the auto industry can replace obsolete strategies dating to Henry Ford's era with a system that reconnects customers to the value chain: a build-to-order model centered on process, product, and volume flexibility.

Download or read book Recent Advances in Global Optimization written by Christodoulos A. Floudas and published by Princeton University Press. This book was released on 2014-07-14 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will present the papers delivered at the first U.S. conference devoted exclusively to global optimization and will thus provide valuable insights into the significant research on the topic that has been emerging during recent years. Held at Princeton University in May 1991, the conference brought together an interdisciplinary group of the most active developers of algorithms for global optimization in order to focus the attention of the mathematical programming community on the unsolved problems and diverse applications of this field. The main subjects addressed at the conference were advances in deterministic and stochastic methods for global optimization, parallel algorithms for global optimization problems, and applications of global optimization. Although global optimization is primarily a mathematical problem, it is relevant to several other disciplines, including computer science, applied mathematics, physical chemistry, molecular biology, statistics, physics, engineering, operations research, communication theory, and economics. Global optimization problems originate from a wide variety of mathematical models of real-world systems. Some of its applications are allocation and location problems and VLSI and data-base design problems. Originally published in 1991. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.