Download or read book Ordonnancement des syst mes de production flexibles soumis diff rents types de contraintes de blocage written by Wajdi Trabelsi and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce sujet de thèse concerne de manière générale l'évaluation des performances et l'ordonnancement dans des systèmes de production flexibles et principalement les problèmes d'ordonnancement d'atelier de type Flow-Shop et Flow-Shop hybride. Le problème d'ordonnancement d'un Flow-Shop peut être défini ainsi : un ensemble de N jobs composés chacun de M opérations, doivent passer sur M machines dans le même ordre. Une machine peut exécuter une seule opération à la fois, chaque job ne peut avoir qu'une seule opération en cours de réalisation simultanément et la préemption n'est pas autorisée. Dans le cas des Flow-Shops hybrides, Mk machines identiques sont disponibles à chaque étage k en un ou plusieurs exemplaires. Pour cette étude, notre objectif est toujours de minimiser le temps total d'exécution aussi appelé makespan. Les problèmes d'ordonnancement les plus répandus sont de type Flow-Shop classique où les espaces de stockage entre les machines sont considérées comme infinies. D'autres problèmes sont caractérisés par des capacités de stockage limitées ou nulles qui engendre une seule contrainte de blocage. Cette contrainte peut être un blocage classique (de type RSb) ou particulier (de type RCb ou RCb*). Dans nos travaux de recherche, nous présentons un cas général qui peut être tiré de l'industrie et modélisé sous forme de systèmes de type Flow-Shop et Flow-Shop hybride soumis simultanément à plusieurs types de blocage. Pour résoudre ce genre de problèmes, nous avons étudié dans cette thèse la complexité de ces systèmes et nous avons proposé des méthodes exactes, des méthodes approchées ainsi que des bornes inférieures.

Download or read book Ordonnancement des syst mes flexibles avec contrainte de blocage written by Ali Gorine and published by . This book was released on 2011 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux de recherche proposés dans cette thèse portent sur les problèmes d'ordonnancement rencontrés dans les systèmes de production automatisés en prenant en compte des contraintes telles que l'absence d'espace de stockage entre les machines et la flexibilité des ressources. Plus particulièrement, nous avons étudié les problèmes d'ordonnancement de job-shops classiques et hybrides soumis à des contraintes de blocage particulières avec comme objectif la minimisation du temps total d'opération. Dans un premier temps, nous avons modélisé les problèmes d'ordonnancement de type job-shop (classique et flexible) avec la contrainte de blocage particulière afin d'obtenir une solution exacte. Pour les problèmes de taille plus importante, il n'était pas possible d'obtenir une solution exacte à ce problème en un temps raisonnable. Par conséquent, nous avons développé des bornes inférieures complémentaires. Dans le cas du job shop classique, une méta-heuristique basée sur l'algorithme de recuit simulé pour résoudre le problème étudié a été proposée. Pour développer un voisinage efficace, nous avons donné une méthode qui permet de détecter les conflits qui peuvent survenir après la modification des séquences. Des résultats d'expérimentations réalisés sur des instances de petites et moyennes tailles montrent l'efficacité de bornes inférieures ainsi que l'heuristique développée

Download or read book Ordonnancement des systemes flexibles de production sous contraintes de disponibilite des ressources written by Sadia Azem and published by . This book was released on 2010 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: La majeure partie des travaux sur les problèmes d’ordonnancement se placent dans le contexte où les ressources sont disponibles en permanence. Ce qui en réalité n’est pas toujours le cas. Nous nous plaçons dans le contexte d’indisponibilités connues ; nous nous intéressons plus particulièrement aux problèmes de type job shop avec des périodes d’indisponibilité flexibles et des tâches pouvant éventuellement être interrompues par les périodes d’indisponibilité. L’intégration de ces contraintes rend les problèmes d’ordonnancement nettement plus difficiles à résoudre. La flexibilité que nous considérons peut être relative à au moins l’un des points suivants : déplacement de la période d’indisponibilité dans une fenêtre de temps, modification de la durée de la période d’indisponibilité, interruption d’une tâche par une période d’indisponibilité, ensuite reprise avec une éventuelle pénalité.Dans cette thèse, nous avons proposé des modèles mathématiques pour le problème. En plus de la résolution des problèmes considérés, le but de ces modélisations est de permettre d’analyser l'impact des différentes contraintes et d'évaluer la qualité des méthodes approchées que nous proposons. Ces dernières permettent de construire très rapidement un ordonnancement en se basant sur des règles de priorité. Les solutions sont aussi utilisées pour notre approche basée sur la génération de colonnes. Cette approche s’adapte bien à différents fonctions objectif et permet d'intégrer relativement facilement plusieurs contraintes. De nombreuses expérimentations ont été menées pour valider les méthodes proposées.

Download or read book Ordonnancement de syst mes de production avec contraintes de blocage written by Sergio Martinez de La Piedra and published by . This book was released on 2005 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux de recherche proposés dans cette thèse portent sur l'ordonnancement des systèmes de production de type Flow-Shop, et Flow-Shop hybride à deux étages avec des contraintes de blocage particulières rencontrées dans plusieurs environnements industriels. Dans un premier temps, ces contraintes de blocage ainsi que quelques exemples d'applications sont présentés. Ensuite, la deuxième partie de cette thèse est consacrée aux systèmes de type flow-shop avec blocage. Nous démontrons tout d'abord des résultats de complexité pour ce problème. Ensuite, nous proposons deux modèles mathématiques permettant de résoudre ce problème de façon exacte. Plusieurs bornes inférieures sont ensuite proposées, ainsi que des heuristiques dont la solution est améliorée par un recuit simulé utilisant plusieurs voisinages. La troisième partie concerne les flow-shops hybrides. Nous proposons dans cette partie un modèle mathématique inspiré d'un des modèles mathématiques développés pour le flow-shop avec blocage, plusieurs bornes inférieures, plusieurs heuristiques, dont l'une est une extension de l'heuristique présentée pour le flow-shop, et une adaptation du recuit simulé présenté dans la deuxième partie. Les résultats des expérimentations réalisées sur des jeux de données aléatoires montrent l'efficacité des différents algorithmes proposés.

Download or read book Mathematical Aspects of Scheduling and Applications written by R. Bellman and published by Elsevier. This book was released on 2014-05-20 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical Aspects of Scheduling and Applications addresses the perennial problem of optimal utilization of finite resources in the accomplishment of an assortment of tasks or objectives. The book provides ways to uncover the core of these problems, presents them in mathematical terms, and devises mathematical solutions for them. The book consists of 12 chapters. Chapter 1 deals with network problems, the shortest path problem, and applications to control theory. Chapter 2 stresses the role and use of computers based on the decision-making problems outlined in the preceding chapter. Chapter 3 classifies scheduling problems and their solution approaches. Chapters 4 to 6 discuss machine sequencing problems and techniques. Chapter 5 tackles capacity expansion problems and introduces the technique of embedded state space dynamic programming for reducing dimensionality so that larger problems can be solved. Chapter 6 then examines an important class of network problems with non-serial phase structures and exploits dimensionality reduction techniques, such as the pseudo-stage concept, branch compression, and optimal order elimination methods to solve large-scale, nonlinear network scheduling problems. Chapters 7 to 11 consider the flow-shop scheduling problem under different objectives and constraints. Chapter 12 discusses the job-shop-scheduling problem. The book will be useful to economists, planners, and graduate students in the fields of mathematics, operations research, management science, computer science, and engineering.

Download or read book Machine Scheduling Problems written by A.H.G. Rinnooy Kan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. Introduction.- 2. Problem Formulation.- 2.1. Notations and representations.- 2.2. Restrictive assumptions.- 2.3. Optimality criteria.- 2.3.1. Regular measures.- 2.3.1.1. Criteria based on completion times.- 2.3.1.2. Criteria based on due dates.- 2.3.1.3. Criteria based on inventory cost and utilization.- 2.3.2. Relations between criteria.- 2.3.3. Analysis of scheduling costs.- 2.4. Classification of problems.- 3. Methods of Solution.- 3.1. Complete enumeration.- 3.2. Combinatorial analysis.- 3.3. Mixed integer and non-linear programming.- 3.3.1. [Bowman 1959].- 3.3.2. [Pritsker et al. 1969].

Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.

Download or read book Arctic Shipping written by Frédéric Lasserre and published by Routledge. This book was released on 2019-09-05 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book considers both the present state of Arctic shipping and possible future trends with reference to the various sectors of maritime transportation: cruise tourism, container traffic and bulk shipping. Ports are analysed as tools that support the strategies of coastal states to foster the development of resource extraction, enhance the attractiveness of Arctic shipping lanes and enable the control of maritime activities through coast guard deployment. The aim of this book is to draw a picture of the trends of Arctic shipping. How is traffic evolving in Canada’s Arctic, or along the Northern Sea Route? Are there significant differences between bulk and container shipping segments when considering the Arctic market? How are the ports and the hinterland developing and what are the strategies behind those? How is the legal framework shaping the evolution of maritime transportation? The contributors to this book consider all of these questions, and more, as they map out the prospects for Arctic shipping and analyse in detail the development of Arctic shipping as a result of multi-variable interactions. This book will be key reading for industry professionals and post-graduate students alike.

Download or read book Principles of Sequencing and Scheduling written by Kenneth R. Baker and published by John Wiley & Sons. This book was released on 2018-11-06 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: An updated edition of the text that explores the core topics in scheduling theory The second edition of Principles of Sequencing and Scheduling has been revised and updated to provide comprehensive coverage of sequencing and scheduling topics as well as emerging developments in the field. The text offers balanced coverage of deterministic models and stochastic models and includes new developments in safe scheduling and project scheduling, including coverage of project analytics. These new topics help bridge the gap between classical scheduling and actual practice. The authors—noted experts in the field—present a coherent and detailed introduction to the basic models, problems, and methods of scheduling theory. This book offers an introduction and overview of sequencing and scheduling and covers such topics as single-machine and multi-machine models, deterministic and stochastic problem formulations, optimization and heuristic solution approaches, and generic and specialized software methods. This new edition adds coverage on topics of recent interest in shop scheduling and project scheduling. This important resource: Offers comprehensive coverage of deterministic models as well as recent approaches and developments for stochastic models Emphasizes the application of generic optimization software to basic sequencing problems and the use of spreadsheet-based optimization methods Includes updated coverage on safe scheduling, lognormal modeling, and job selection Provides basic coverage of robust scheduling as contrasted with safe scheduling Adds a new chapter on project analytics, which supports the PERT21 framework for project scheduling in a stochastic environment. Extends the coverage of PERT 21 to include hierarchical scheduling Provides end-of-chapter references and access to advanced Research Notes, to aid readers in the further exploration of advanced topics Written for upper-undergraduate and graduate level courses covering such topics as scheduling theory and applications, project scheduling, and operations scheduling, the second edition of Principles of Sequencing and Scheduling is a resource that covers scheduling techniques and contains the most current research and emerging topics.

Download or read book Decision Diagrams for Optimization written by David Bergman and published by Springer. This book was released on 2016-11-01 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces a novel approach to discrete optimization, providing both theoretical insights and algorithmic developments that lead to improvements over state-of-the-art technology. The authors present chapters on the use of decision diagrams for combinatorial optimization and constraint programming, with attention to general-purpose solution methods as well as problem-specific techniques. The book will be useful for researchers and practitioners in discrete optimization and constraint programming. "Decision Diagrams for Optimization is one of the most exciting developments emerging from constraint programming in recent years. This book is a compelling summary of existing results in this space and a must-read for optimizers around the world." [Pascal Van Hentenryck]

Download or read book In Vessel Melt Retention and Ex Vessel Corium Cooling IAEA Tecdoc No 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.

Download or read book Prescriber s Guide Antidepressants written by Stephen M. Stahl and published by Cambridge University Press. This book was released on 2014-09-25 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: This spin-off from Stephen Stahl's new, completely revised, and fully updated fifth edition of the Prescriber's Guide covers the most important drugs in use today for treating depression. Now established as the indispensable formulary in psychopharmacology, easy to navigate and easy to use, the Prescriber's Guide combines evidence-based information with clinically informed guidance to support clinicians in making the most effective prescribing decisions for the good of their patients. Incorporating information on the newest indications, new formulations, new recommendations and new safety data, this edition continues to provide the essential practical support required by anyone prescribing in the field of mental health.

Download or read book A Zero one Programming Approach to Scheduling with Limited Resources written by A. Alan B. Pritsker and published by . This book was released on 1968 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A zero-one linear programming formulation of scheduling problems that is more versatile and efficient than any other known LP formulation. It is the first formulation designed to accommodate multiple resource constraints. Bowman's formulation can be extended to do so, but in a sample comparison, it required 72 variables and 125 constraints for a 3-project, 8-job, 3-resource problem compared with 33 variables and 48 constraints for the new formulation. The new method also showed substantial improvement when compared with schedules based on two common dispatching rules: first-come-first-served and earliest-completion-date. Execution time on an IBM 7044, using the Geoffrion computer code was 3 seconds. Other objective functions are formulated in the study and additional constraints are modeled. Examples of larger problems rewritten for standard LP computer codes showed that the number of variables and constraints involved are probably within no more than one order-of-magnitude of the maximum number that could be handled with available zero-one computer codes. (Author).

Download or read book Good Governance and the European Union written by Deirdre Curtin and published by Intersentia nv. This book was released on 2005 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book approaches the notion of good governance from three different angles. First it establishes whether it is a meaningful notion at all by taking a closer look at the parameters of good governance. Secondly, the authors look at the institutional translation of the criteria of good governance. In a third dimension, the concept may be analysed in relation to a number of substantive issues.

Download or read book Architecture for the Dead Cairo s Medieval Necropolis written by Galila El Kadi and published by American Univ in Cairo Press. This book was released on 2007 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The great medieval necropolis of Cairo, comprising two main areas that together stretch twelve kilometers from north to south, constitutes a major feature of the city's urban landscape. With monumental and smaller-scale mausolea dating from all eras since early medieval times, and boasting some of the finest examples of Mamluk architecture not just in the city but in the region, the necropolis is an unparalleled--and until now largely undocumented--architectural treasure trove. In Architecture for the Dead, architect Galila El Kadi and photographer Alain Bonnamy have produced a comprehensive and visually stunning survey of all areas of the necropolis. Through detailed and painstaking research and remarkable photography, in text, maps, plans, and pictures, they describe and illustrate the astonishing variety of architectural styles in the necropolis: from Mamluk to neo-Mamluk via baroque and neo-pharaonic, from the grandest stone buildings with their decorative domes and minarets to the humblest--but elaborately decorated--wooden structures. The book also documents the modern settlement of the necropolis by families creating a space for the living in and among the tombs and architecture for the dead.

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 Proof Theory and Automated Deduction written by Jean Goubault-Larrecq and published by Springer Science & Business Media. This book was released on 2001-11-30 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in computer applications has led to a new attitude to applied logic in which researchers tailor a logic in the same way they define a computer language. In response to this attitude, this text for undergraduate and graduate students discusses major algorithmic methodologies, and tableaux and resolution methods. The authors focus on first-order logic, the use of proof theory, and the computer application of automated searches for proofs of mathematical propositions. Annotation copyrighted by Book News, Inc., Portland, OR