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Contribution A La Planification Et A Lordonnancement De Systemes Flexibles De Production Sujets A Pannes
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Book Synopsis Contribution à la planification et à l'ordonnancement de systèmes flexibles de production sujets à pannes by : Olivier De Smet
Download or read book Contribution à la planification et à l'ordonnancement de systèmes flexibles de production sujets à 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.
Book Synopsis APPROCHE MULTI-MODELE POUR LA PLANIFICATION DE SYSTEMES FLEXIBLES DE PRODUCTION SUJETS A PANNES by : SYLVAIN.. JUHEL
Download or read book APPROCHE MULTI-MODELE POUR LA PLANIFICATION DE SYSTEMES FLEXIBLES DE PRODUCTION SUJETS A PANNES written by SYLVAIN.. JUHEL and published by . This book was released on 2000 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL ABORDE LES PROBLEMATIQUES DE LA PLANIFICATION (NIVEAU TACTIQUE) DANS LE CADRE DE LA GESTION DES SYSTEMES DE PRODUCTION FLEXIBLES (JOB-SHOP) SUJETS A PANNES. DES MODELES A FLUX, A SAUTS MARKOVIENS, SONT PRESENTES. PARMI CEUX-CI, LE MODELE, A TEMPS DISCRET, INTEGRANT LES PANNES DANS L'EQUATION D'EVOLUTION PAR L'UTILISATION D'UNE MATRICE DE CAPACITE DEPENDANT DE L'ETAT DE FONCTIONNEMENT DU SYSTEME, PERMET, ASSOCIE A UNE FONCTION DE COUT QUADRATIQUE, D'OBTENIR UNE COMMANDE OPTIMALE SUR UN HORIZON INFINI. ELLE EST CALCULEE A PARTIR D'UN ENSEMBLE D'EQUATIONS MATRICIELLES COUPLEES DE TYPE RICCATI. UNE APPROCHE PERMET DE REDUIRE LA TAILLE DU SYSTEME A CALCULER EN CONSIDERANT CHAQUE GAMME DE FABRICATION COMME UNE MACHINE MONO-PRODUIT. ON VERIFIE QUE LE NOUVEAU MODELE AGREGE EST ENCORE A SAUTS MARKOVIENS. CE MODELE IGNORE LES STOCKS D'EN-COURS, MANIPULE UN FLUX CONTINU DE PIECES ET N'INTEGRE PAS DIRECTEMENT LES CAPACITES DES MACHINES DANS LE CALCUL DE LA COMMANDE OPTIMALE. EN REVANCHE SA COMMANDE A RETOUR D'ETAT TIENT COMPTE DES FUTURES PANNES MACHINES. UN AUTRE MODELE A FLUX PROPOSE PERMET DE LEVER CES HYPOTHESES FORTES POUR LE TYPE D'ATELIER ETUDIE. MAIS LA NOUVELLE COMMANDE OPTIMALE OBTENUE PAR PROGRAMMATION LINEAIRE EN NOMBRES ENTIERS N'INTEGRE PAS LES PANNES. ON REGROUPE ALORS LES DEUX COMMANDES OPTIMALES SOUS FORME D'ADDITION PONDEREE PAR UN COEFFICIENT CALCULE SUIVANT DIFFERENTES STRATEGIES DE SIMULATION AVEC L'OBJECTIF DE REDUIRE LES COUTS D'EN-COURS ET LES RETARDS DE LIVRAISON. ON UTILISE UN SIMULATEUR DE FLUX POUR VALIDER LA FAISABILITE DU PLAN DE FABRICATION PRET A ETRE ENVOYE AU NIVEAU ORDONNANCEMENT. LA COMMANDE SOUS OPTIMALE EST CALCULEE EN TEMPS REEL ET POUR DES ATELIERS DE TAILLE REALISTE. UN EXEMPLE D'ATELIER A 4 MACHINES ET 3 TYPES DE PIECES SERT DE SUPPORT POUR L'ENSEMBLE DU MEMOIRE.
Book Synopsis L' Apprentissage individuel et collectif des agents d'ordonnancement pour l'atelier flexible by : Rachel Lau
Download or read book L' Apprentissage individuel et collectif des agents d'ordonnancement pour l'atelier flexible written by Rachel Lau and published by . This book was released on 1997 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une des plus grandes difficultés du problème de la planification et de l'ordonnancement des Systèmes Flexibles de Production (SFP) est la commande en temps réel des opérations dynamiques de ces systèmes. Normalement l'ordonnancement à ce niveau suit, soit un ordonnancement prédictif calculé avant le début de la production, soit des décisions réactives élaborées en temps réel. L'ordonnancement prédictif nécessite des données précises, ce qui est souvent difficile à obtenir. L'ordonnancement réactif doit fournir une solution avec des contraintes de temps importantes. L'idée générale de notre recherche est de trouver des principes et des outils permettant d'améliorer conjointement l'ordonnancement prédictif et l'ordonnancement réactif par apprentissage mutuel. Nous commençons notre recherche par la réduction de la compexité du problème, le décomposant en plusieurs problèmes d'affectation des ressources, correspondant à chaque situation de prise de décision dans un SFP. Ensuite, nous introduisons la notion d'agents intelligents, entraînés par apprentissage supervisé, à l'aide d'exemples fournis par simulation. Chaque agent doit être capable de décider individuellement, sans l'assistance des autres agents. Bien que chaque agent soit "myope", étant limité à son propre problème d'ordonnancement, il est capable de proposer une solution réalisable dans un environnement de processus distribué. le point central de notre recherche est d'étudier le comportement collectif de ces agents. Lorsqu'ils sont ensembles, ils rencontrent des problèmes comme l'adaptation, la résolution des conflits, la compétition, et d'autres problèmes "sociaux". Chaque agent doit être jugé selon l'efficacité de sa contribution à l'objectif global de production. Utilisant ses retours d'informations, chaque agent peut améliorer sa performance, par l'apprentissage renforcé, comme membre d'une équipe. La mise en oeuvre de cette approche est testée sur un exemple
Book Synopsis The Oxford Handbook of Water Politics and Policy by : Ken Conca
Download or read book The Oxford Handbook of Water Politics and Policy written by Ken Conca and published by Oxford University Press. This book was released on 2018 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is currently in development, with individual articles publishing online in advance of print publication. At this time, we cannot add information about unpublished articles in this handbook, however the table of contents will continue to grow as additional articles pass through the review process and are added to the site. Please note that the online publication date for this handbook is the date that the first article in the title was published online. For more information, please read the site FAQs.
Book Synopsis Recent Advances in Global Optimization by : Christodoulos A. Floudas
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.
Book Synopsis Statistical Inference for Ergodic Diffusion Processes by : Yury A. Kutoyants
Download or read book Statistical Inference for Ergodic Diffusion Processes written by Yury A. Kutoyants and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book in inference for stochastic processes from a statistical, rather than a probabilistic, perspective. It provides a systematic exposition of theoretical results from over ten years of mathematical literature and presents, for the first time in book form, many new techniques and approaches.
Book Synopsis Semiparametric Theory and Missing Data by : Anastasios Tsiatis
Download or read book Semiparametric Theory and Missing Data written by Anastasios Tsiatis and published by Springer Science & Business Media. This book was released on 2007-01-15 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes current knowledge regarding the theory of estimation for semiparametric models with missing data, in an organized and comprehensive manner. It starts with the study of semiparametric methods when there are no missing data. The description of the theory of estimation for semiparametric models is both rigorous and intuitive, relying on geometric ideas to reinforce the intuition and understanding of the theory. These methods are then applied to problems with missing, censored, and coarsened data with the goal of deriving estimators that are as robust and efficient as possible.
Download or read book Metaheuristics written by Patrick Siarry and published by Springer. This book was released on 2016-12-24 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metaheuristics exhibit desirable properties like simplicity, easy parallelizability, and ready applicability to different types of optimization problems. After a comprehensive introduction to the field, the contributed chapters in this book include explanations of the main metaheuristics techniques, including simulated annealing, tabu search, evolutionary algorithms, artificial ants, and particle swarms, followed by chapters that demonstrate their applications to problems such as multiobjective optimization, logistics, vehicle routing, and air traffic management. The authors are leading researchers in this domain, with considerable teaching and applications experience, and the book will be of value to industrial practitioners, graduate students, and research academics.
Book Synopsis FiWi Access Networks by : Martin Maier
Download or read book FiWi Access Networks written by Martin Maier and published by Cambridge University Press. This book was released on 2011-12-15 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of broadband access networks toward bimodal fiber-wireless (FiWi) access networks, described in this book, may be viewed as the endgame of broadband access. After discussing the economic impact of broadband access and current worldwide deployment statistics, all the major legacy wireline and wireless broadband access technologies are reviewed. State-of-the-art GPON and EPON fiber access networks are described, including their migration to next-generation systems such as OCDMA and OFDMA PONs. The latest developments of wireless access networks are covered, including VHT WLAN, Gigabit WiMAX, LTE and WMN. The advantages of FiWi access networks are demonstrated by applying powerful network coding, heterogeneous optical and wireless protection, hierarchical frame aggregation, hybrid routing and QoS continuity techniques across the optical-wireless interface. The book is an essential reference for anyone working on optical fiber access networks, wireless access networks or converged FiWi systems.
Book Synopsis CIKM'13 by : CIKM 13 Conference Committee
Download or read book CIKM'13 written by CIKM 13 Conference Committee and published by . This book was released on 2013-10-27 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt: CIKM'13: 22nd ACM International Conference on Information and Knowledge Management Oct 27, 2013-Nov 01, 2013 San Francisco, USA. You can view more information about this proceeding and all of ACM�s other published conference proceedings from the ACM Digital Library: http://www.acm.org/dl.
Author :John Henry Lorentz Publisher :Historical Dictionaries of Asia, Oceania, and the Middle East ISBN 13 : Total Pages :570 pages Book Rating :4.F/5 ( download)
Book Synopsis Historical Dictionary of Iran by : John Henry Lorentz
Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.
Author :Msangi Josephine Phillip Publisher :Springer Science & Business Media ISBN 13 :9400770979 Total Pages :135 pages Book Rating :4.4/5 (7 download)
Book Synopsis Combating Water Scarcity in Southern Africa by : Msangi Josephine Phillip
Download or read book Combating Water Scarcity in Southern Africa written by Msangi Josephine Phillip and published by Springer Science & Business Media. This book was released on 2013-08-13 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a close examination of water scarcity as a developmental challenge facing member nations of the Southern African Development Community (SADC), the interventions that have been implemented to combat the situation and the challenges still outstanding. The first chapter paints the backdrop of the water scarcity problem, reviewing historical approaches from the 1992 Earth Summit in Rio de Janeiro to the Johannesburg World Summit on Sustainable Development (2002) to the United Nations Rio+20 Conference on Sustainable Development (2012), and recapping principles and agreements reached during and after these conferences. Chapter two examines the Southern Africa region’s efforts to combat water scarcity including principles, policies and strategies and the responsibility of each member to implement them. Written by the editor, J.P. Msangi, the chapter describes Namibia’s efforts to ensure management of scarce water. Beyond enacting management and pollution control regulations and raising public awareness, Namibia encourages research to ensure attainment of the requirements of both the SADC Protocol and its own water scarcity management laws. The next three chapters offer Namibia-based case studies on impacts of pollution on water treatment; on the effects of anthropogenic activities on water quality and on the effects of water transfers from dams upstream of Von Bach dam. The final chapter provides detailed summaries of the issues discussed in the book, highlighting conclusions and offering recommendations. Combating Water Scarcity in Southern Africa synthesizes issues pertinent to the SADC countries as well as to other regions, and offers research that up to now has not been conducted in Namibia.
Book Synopsis On-line Estimation and Adaptive Control of Bioreactors by : G. Bastin
Download or read book On-line Estimation and Adaptive Control of Bioreactors written by G. Bastin and published by Elsevier. This book was released on 2013-10-22 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with monitoring and control of biotechnological processes. Different methods are proposed which are based on the nonlinear structure of the process and do not require any a priori knowledge of the fermentation parameters. The theoretical stability and convergence properties of the proposed algorithms are analysed and their performances are illustrated by simulation results and, in many instances, by real life experiments. The concept of software sensors is introduced; these are algorithms based on the nonlinear model of the process and designed for on-line estimation of the biological variables and/or the fermentation parameters. In order to deal with process nonstationarities and parameter uncertainties, reference is made to adaptive estimation and control techniques.The book is the result of an intensive joint research effort by the authors during the last decade. It is intended as a graduate level text for students of bioengineering as well as a reference text for scientists and engineers involved in the design and optimization of bioprocesses.
Book Synopsis Flows and Practices by : Mehta, Lyla
Download or read book Flows and Practices written by Mehta, Lyla and published by Weaver Press. This book was released on 2017-05-19 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the past two decades, Integrated Water Resources Management (IWRM) has been the dominant paradigm in water resources. This book explores how ideas of IWRM are being translated and adapted in Mozambique, South Africa, Tanzania, Uganda and Zimbabwe. Grounded in social science theory and research, it highlights the importance of politics, history and culture in shaping water management practices and reform, and demonstrates how Africa has clearly been a laboratory for IWRM. While a new cadre of professionals made IWRM their mission, we show that poor women and men may not have always benefitted. In some cases IWRM has also offered a distraction from more critical issues such as water and land grabs, privatisation, the negative impacts of water permits, and a range of institutional ambiguities that prevent water allocations to small and poor water users. By critically examining the interpretations and challenges of IWRM, the book contributes to improving water policies and practices and making them more locally appropriate in Africa and beyond.
Download or read book Privatizing Water written by Karen Bakker and published by Cornell University Press. This book was released on 2013-02-15 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water supply privatization was emblematic of the neoliberal turn in development policy in the 1990s. Proponents argued that the private sector could provide better services at lower costs than governments; opponents questioned the risks involved in delegating control over a life-sustaining resource to for-profit companies. Private-sector activity was most concentrated—and contested—in large cities in developing countries, where the widespread lack of access to networked water supplies was characterized as a global crisis. In Privatizing Water, Karen Bakker focuses on three questions: Why did privatization emerge as a preferred alternative for managing urban water supply? Can privatization fulfill its proponents' expectations, particularly with respect to water supply to the urban poor? And, given the apparent shortcomings of both privatization and conventional approaches to government provision, what are the alternatives? In answering these questions, Bakker engages with broader debates over the role of the private sector in development, the role of urban communities in the provision of "public" services, and the governance of public goods. She introduces the concept of "governance failure" as a means of exploring the limitations facing both private companies and governments. Critically examining a range of issues—including the transnational struggle over the human right to water, the "commons" as a water-supply-management strategy, and the environmental dimensions of water privatization—Privatizing Water is a balanced exploration of a critical issue that affects billions of people around the world.
Book Synopsis Historical Dictionary of Pakistan by : Shahid Javed Burki
Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --
Book Synopsis Semigroups for Delay Equations by : András Bátkai
Download or read book Semigroups for Delay Equations written by András Bátkai and published by A K Peters, Ltd.. This book was released on 2005 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: In most physical, chemical, biological and economic phenomena it is quite natural to assume that the system not only depends on the present state but also on past occurrences. These circumstances are mathematically described by partial differential equations with delay. This book presents, in a systematic fashion, how delay equations can be studied in Lp-history spaces.Appendices offering supplementary information and a comprehensive index make this book an ideal introduction and research tool for mathematicians, chemists, biologists and economists.
