Download or read book Approche nerg tique pour l ordonnancement de t ches sous contraintes de temps et des ressources written by Pierre Lopez (informaticien).) and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail concerne l'ordonnancement de tâches interdépendantes sous contraintes de temps et de ressources. Les méthodes et techniques développées s'inscrivent dans la problématique de l'analyse sous contraintes des problèmes d'ordonnancement. Celle-ci vise à caractériser les ordonnancements admissibles de manière a proposer au décideur un choix d'actions cohérentes vis-à-vis des contraintes. L'analyse est décrite comme un processus d'inférence mettant en interaction une base de règles et une base de faits temporels et séquentiels représentant les caractéristiques des ordonnancements admissibles. Des travaux antérieurs ont ainsi permis la réalisation du logiciel Mascot écrit en Prolog. Ils sont ici enrichis par une nouvelle approche dont l'originalité réside essentiellement dans l'utilisation du concept d'énergie issu du couplage du temps et des ressources. Le concept d'intervalle temps-ressource est introduit; il permet de représenter simultanément des caractéristiques temporelles et de ressource. On distingue les intervalles consommateurs (ou tâches) et les intervalles fournisseurs. Le type de déduction mis en jeu dans Mascot a été amélioré par la prise en compte des interactions entre intervalles consommateurs et fournisseurs. De nouvelles règles de déduction ont été écrites et intégrées dans Mascot, donnant lieu au logiciel Mascot2. D'autre part, un processus de déduction, basé sur un raisonnement purement énergétique, a été élaboré et implémenté en Prolog (logiciel report). Il met en jeu des instants remarquables, points de cassure des courbes d'énergie associées aux tâches. L'outil de modélisation utilisé est le graphe potentiels-bornes; il permet de représenter des contraintes numériques et des contraintes symboliques entre intervalles. Il sert de support a un processus d'inférence par propagation numérique des contraintes.

Download or read book Production Scheduling written by Pierre Lopez and published by John Wiley & Sons. This book was released on 2013-03-01 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of an company depends both on its technological expertise and its managerial and organizational effectiveness. Production management is an important part of the process for manufacturing firms. The organization of production relies in general on the implementation of a certain number of basic functions, among which the scheduling function plays an essential role. This title presents recently developed methods for resolving scheduling issues. The basic concepts and the methods of production scheduling are introduced and advanced techniques are discussed, providing readers with a comprehensive and accessible guide to employing this process.

Download or read book Logic Programming written by Michael Maher and published by MIT Press. This book was released on 1996 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes tutorials, invited lectures, and refereed papers on all aspects of logic programming including: Constraints, Concurrency and Parallelism, Deductive Databases, Implementations, Meta and Higher-order Programming, Theory, and Semantic Analysis. September 2-6, 1996, Bonn, Germany Every four years, the two major international scientific conferences on logic programming merge in one joint event. JICSLP'96 is the thirteenth in the two series of annual conferences sponsored by The Association for Logic Programming. It includes tutorials, invited lectures, and refereed papers on all aspects of logic programming including: Constraints, Concurrency and Parallelism, Deductive Databases, Implementations, Meta and Higher-order Programming, Theory, and Semantic Analysis. The contributors are international, with strong contingents from the United States, United Kingdom, France, and Japan. Logic Programming series, Research Reports and Notes

Download or read book Project Scheduling written by Jan Weglarz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Project scheduling problems are, generally speaking, the problems of allocating scarce resources over time to perform a given set of activities. The resources are nothing other than the arbitrary means which activities complete for. Also the activities can have a variety of interpretations. Thus, project scheduling problems appear in a large spectrum of real-world situations, and, in consequence, they have been intensively studied for almost fourty years. Almost a decade has passed since the multi-author monograph: R. Slowinski, 1. W~glarz (eds. ), Advances in Project Scheduling, Elsevier, 1989, summarizing the state-of-the-art across project scheduling problems, was published. Since then, considerable progress has been made in all directions of modelling and finding solutions to these problems. Thus, the proposal by Professor Frederick S. Hillier to edit a handbook which reports on the recent advances in the field came at an exceptionally good time and motivated me to accept the challenge. Fortunately, almost all leading experts in the field have accepted my invitation and presented their completely new advances often combined with expository surveys. Thanks to them, the handbook stands a good chance of becoming a key reference point on the current state-of-the-art in project scheduling, as well as on new directions in the area. The contents are divided into four parts. The first one, dealing with classical models -exact algorithms, is preceded by a proposition of the classification scheme for scheduling problems.

Download or read book Project Scheduling with Time Windows written by Ulrich Dorndorf and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Project Scheduling is concerned with the allocation of scarce resources over time. The rich optimisation models with time windows that are treated in this book cover a multitude of practical decision problems arising in diverse application areas such as construction engineering or make-to-order production planning. The book shows how Constraint Propagation techniques from Artificial Intelligence can be successfully combined with Operations Research methods for developing powerful exact and heuristic solution algorithms for a very general class of scheduling problems. Example applications demonstrate the effectiveness of the approach.

Download or read book Ordonnancement sous contraintes d nergie written by Margaux Nattaf and published by . This book was released on 2016 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les problèmes d'ordonnancement à contraintes de ressource ont été largement étudiés dans la littérature. Cependant, dans la plupart des cas, il est supposé que les activités ont une durée fixe et nécessitent une quantité constante de la ressource durant toute leur exécution. Dans cette thèse, nous nous proposons de traiter un problème d'ordonnancement dans lequel les tâches ont une durée et un profil de consommation de ressource variables. Ce profil, qui peut varier en fonction du temps, est une variable de décision du problème dont dépend la durée de la tâche associée. Par ailleurs, la considération de fonctions de rendement linéaires et non linéaires pour la représentation de l'utilisa- tion des ressources complexifie le problème et permet de modéliser de manière réaliste les transferts de ressources énergétiques. Pour ce problème NP-complet, nous présentons plusieurs propriétés per- mettant de dériver des modèles et méthodes de résolution. Ces méthodes de résolution sont divisées en deux parties. La première partie visualise ce problème du point de vue de la Programmation Par Contraintes et plusieurs méthodes dérivées de ce paradigme sont détaillées dont le développement du raisonnement énergétique sur le problème étudié. La seconde partie de la thèse est dédiée à des approches de Programmation Linéaire Mixte et plusieurs modèles, notamment un modèle à temps continu basé sur les événements, ainsi que des analyses théoriques et des techniques d'amélioration de ces modèles sont présentés. Enfin, des expérimentations viennent appuyer les résultats présentés dans ce manuscrit.

Download or read book The Practical Application of Prolog written by Al Roth and published by . This book was released on 1995 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ordonnancement de t ches sous contraintes sur des m tiers tisser written by Alexandre Mercier-Aubin and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Résumé en anglais

Download or read book M thodes et outils pour l ordonnancement d ateliers avec prise en compte des contraintes additionnelles written by Damien Lamy and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de doctorat aborde trois thématiques: (i) l'ordonnancement des systèmes de production à cheminements multiples et plus particulièrement le Job-shop soumis à un seuil de consommation énergétique ; (ii) la résolution d'un problème d'ordonnancement et d'affectation dans le contexte d'un système flexible de production sous la forme d'un Job-shop Flexible ; (iii) les méthodes de couplage entre la simulation et l'optimisation dans le cadre des problèmes de Job-shop avec incertitude. Différentes approches de résolutions sont appliquées pour chaque problème : une formalisation mathématique est proposée ainsi que plusieurs métaheuristiques (GRASP×ELS, VNS, MA, NSGA-II hybride et GRASP×ELS itéré) pour le Job-shop avec contrainte énergétique. Une extension du GRASP×ELS, notée GRASP-mELS, est ensuite proposée pour résoudre un problème de Job-shop Flexible ; différents systèmes de voisinages utilisés lors des phases de diversification et d'intensification des solutions sont également présentés. Les résultats montrent que les performances du GRASP-mELS sont comparables à celles de la littérature à la fois en terme de qualité et de temps de calcul. La dernière thématique concerne les méthodes de couplage entre optimisation et simulation avec deux problèmes étudiés : 1) un Job-shop Stochastique et 2) un Job-shop Flexible Réactif. Les méthodes de résolution reposent sur des métaheuristiques et sur le langage de simulation SIMAN intégré dans l'environnement ARENA. Les résultats montrent que les deux approches permettent de mieux prendre en compte les aspects aléatoires liés à la réalité des systèmes de production.

Download or read book M thodes par d composition temporelle et probl mes d ordonnancement written by Marie-Luce Levy and published by . This book was released on 1996 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL CONCERNE LA DECOMPOSITION TEMPORELLE DU PROBLEME D'ORDONNANCEMENT A UNE MACHINE AVEC CONTRAINTES DE DATES LIMITES. DEUX APPROCHES DIFFERENTES SONT PROPOSEES. LA PREMIERE S'INSCRIT DANS UN CONTEXTE DE CARACTERISATION DES SOLUTIONS ADMISSIBLES VIS-A-VIS DU RESPECT DES CONTRAINTES DE TEMPS ET DE RESSOURCES. ELLE S'APPUIE SUR LA DEDUCTION DE CONDITIONS D'ADMISSIBILITE TEMPORELLES ET SEQUENTIELLES, A L'AIDE DE REGLES D'ANALYSE SOUS CONTRAINTES. LES CONDITIONS D'ADMISSIBILITE SEQUENTIELLES SONT EXPRIMEES EN ASSOCIANT A CHAQUE TACHE UN INTERVALLE DE RANGS DEFINI COMME L'ENSEMBLE DES POSITIONS NON DEMONTREES INTERDITES DANS UNE SEQUENCE ADMISSIBLE. DES PRINCIPES D'AGREGATION BASES SUR DES COMPARAISONS D'INTERVALLES DE RANGS SONT INTRODUITS ; ILS PERMETTENT DE REGROUPER LES TACHES DE LOCALISATION PROCHE DANS TOUTE SEQUENCE ADMISSIBLE. LES CONDITIONS D'ADMISSIBILITE MISES EN EVIDENCE SONT ENSUITE EXPLOITEES PAR UNE PROCEDURE DE GENERATION DE SOLUTIONS FONDEE SUR LE RESPECT DES INTERVALLES DE RANGS ET DEDIEE AU PROBLEME A UNE MACHINE. DANS LE CADRE DE CETTE PREMIERE APPROCHE, UNE EXTENSION AU PROBLEME DU FLOW-SHOP EST EBAUCHEE. LA SECONDE APPROCHE PAR DECOMPOSITION OBSERVE UNE DEMARCHE PLUS CLASSIQUE DE RECHERCHE D'UNE SOLUTION HEURISTIQUE A UN PROBLEME D'OPTIMISATION COMBINATOIRE. DES TECHNIQUES DE CLASSIFICATION DES DONNEES SONT UTILISEES POUR DECOMPOSER L'ENSEMBLE DES TACHES, EN EXPLOITANT D'EVENTUELLES ZONES DE FAIBLES COUPLAGES ENTRE LES INTERVALLES DE TEMPS QUE DEFINISSENT LES DATES LIMITES. UNE PROCEDURE DE GESTION DES LIENS RESIDUELS ENTRE LES GROUPES AINSI CONSTITUES EST PROPOSEE ; ELLE CONSTRUIT DES SOUS-PROBLEMES A PARTIR DE LA PARTITION DE L'ENSEMBLE DES TACHES, ORDONNANCE CHACUN D'EUX DE FACON OPTIMALE ET FORME UNE SOLUTION EN COORDONNANT LES ORDONNANCEMENTS LOCAUX. DES RESULTATS EXPERIMENTAUX RELATIFS A DES PROBLEMES GENERES ALEATOIREMENT PERMETTENT D'EVALUER LES PERFORMANCES DES DEUX APPROCHES, EN CONFRONTANT LEURS RESULTATS A CEUX OBTENUS PAR UNE METHODE DE RESOLUTION EXACTE

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 Sustainable Production System written by Clément Morlat and published by John Wiley & Sons. This book was released on 2020-06-03 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wealth is no longer just an ability to live well in a world shaped by human activities. It is also an ability to push back or defer the limits of a world in biological and climatic closure. This book examines the theoretical conflicts and the power plays which often oppose the socio-political and technical-financial practices of recognition of what intervenes in the production of this wealth – i.e. of what has value. It lays down the principles of a contributory modeling method, allowing debates around the concept of development; the building of scenarios; the negotiation of their implementation; and a cross-sectoral reading of their social, ecological and economic costs. This method, called Dynamic Modeling of Cost Systems, is based on a territorial communication device which articulates political, contractual and accounting innovations using deliberative and normative digital tools. It combines different local representations of value, in order to approach wealth through an integrated analysis of micro-, meso- and macro- issues.

Download or read book Constraint Based Scheduling written by Philippe Baptiste and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constraint Programming is a problem-solving paradigm that establishes a clear distinction between two pivotal aspects of a problem: (1) a precise definition of the constraints that define the problem to be solved and (2) the algorithms and heuristics enabling the selection of decisions to solve the problem. It is because of these capabilities that Constraint Programming is increasingly being employed as a problem-solving tool to solve scheduling problems. Hence the development of Constraint-Based Scheduling as a field of study. The aim of this book is to provide an overview of the most widely used Constraint-Based Scheduling techniques. Following the principles of Constraint Programming, the book consists of three distinct parts: The first chapter introduces the basic principles of Constraint Programming and provides a model of the constraints that are the most often encountered in scheduling problems. Chapters 2, 3, 4, and 5 are focused on the propagation of resource constraints, which usually are responsible for the "hardness" of the scheduling problem. Chapters 6, 7, and 8 are dedicated to the resolution of several scheduling problems. These examples illustrate the use and the practical efficiency of the constraint propagation methods of the previous chapters. They also show that besides constraint propagation, the exploration of the search space must be carefully designed, taking into account specific properties of the considered problem (e.g., dominance relations, symmetries, possible use of decomposition rules). Chapter 9 mentions various extensions of the model and presents promising research directions.

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 Integrity in Public Procurement Good Practice from A to Z written by OECD and published by OECD Publishing. This book was released on 2007-05-31 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides, for the first time, a comparative overview of practices from A to Z. It maps out practices to enhance integrity throughout the whole procurement cycle, from needs assessment to contract management. It also takes a global stance by including practices from non-OECD countries.

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.

Download or read book Multiple Criteria Optimization written by Xavier Gandibleux and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: The generalized area of multiple criteria decision making (MCDM) can be defined as the body of methods and procedures by which the concern for multiple conflicting criteria can be formally incorporated into the analytical process. MCDM consists mostly of two branches, multiple criteria optimization and multi-criteria decision analysis (MCDA). While MCDA is typically concerned with multiple criteria problems that have a small number of alternatives often in an environment of uncertainty (location of an airport, type of drug rehabilitation program), multiple criteria optimization is typically directed at problems formulated within a mathematical programming framework, but with a stack of objectives instead of just one (river basin management, engineering component design, product distribution). It is about the most modern treatment of multiple criteria optimization that this book is concerned. I look at this book as a nicely organized and well-rounded presentation of what I view as ”new wave” topics in multiple criteria optimization. Looking back to the origins of MCDM, most people agree that it was not until about the early 1970s that multiple criteria optimization c- gealed as a field. At this time, and for about the following fifteen years, the focus was on theories of multiple objective linear programming that subsume conventional (single criterion) linear programming, algorithms for characterizing the efficient set, theoretical vector-maximum dev- opments, and interactive procedures.