Download or read book Contr le temps r el du d roulement des op rations dans les syst mes de production flexibles written by Rousseau Tawegoum and published by . This book was released on 1995 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: La complexité du pilotage temps réel des systèmes de production flexibles nécessite des outils permettant d'exploiter ces flexibilités afin de réagir aux aléas perturbant l'évolution de la production. Nous présentons dans ce mémoire une approche de contrôle en temps réel du déroulement des opérations dans les systèmes de production flexible. Cette approche s'articule d'une part sur l'organisation du pilotage en centres de décisions, et d'autre part sur le contrôle des opérations de transfert et des oprérations de transformation d'état. Nous proposons une structuration du pilotage en centres de décision suivant une architecture de contrôle mixte, incluant les concepts de distribution et de coopéaration. Nous définissons la notion de tâche élémentaire et un ensemble d règles d'agrégation des ressources de base commandables. Ces règles utilisent les relations d'accessibilité et de connexité entre ressources, pour répartir les centres de décision, ce qui permet de définir les compétences de chaque centre de décision au sein de l'architecture. Pour contrôler les opérations de transfert, nous utilisons des fonctions de priorité pour la résolution des conflits d'accès aux ressources, puis nous proposons une heuristique de routage dynamique des produits, prenant en compte les points d'accumulations du sytème de transfert. La surveillance des opérations de traitement est basée sur l'évaluation de l'admissibilité des séquences d'opérations grâce à deux indicateurs. Cette évaluation nous permet, compte tenu des consignes de production et de l'ampleur d'une perturbation, de choisir l'action corrective adaptée à l'évolution du procédé.
Download or read book Computer Aided Control Systems Design CACSD 97 written by L. Boullart and published by Pergamon. This book was released on 1997 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the 7th IFAC Symposium on Computer Aided Control Systems Design (CACSD'97) held in Gent, Belgium on 28-30 April 1997. It presents a high-standing scientific contribution to the challenging field of CACSD and gives an excellent preview of current research which, in coming years, will undoubtedly offer many useful results.The topics covered include: control systems design; special architectures for CACSD; software for CACSD; hybrid discrete-event and real-time systems; symbolic and numerical computations; algorithms for CACSD; CACSD support environments; planning and manufacturing; system modelling and simulation; optimization; robust control; intelligent controller design; and applications.The volume comprises 61 full papers and a challenging keynote address by Professor Georg Gruuml;bel from the DLR Institute of Robotics and System Dynamics, Germany.
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 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 Le Nouvel automatisme written by and published by . This book was released on 1983 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ordonnancement en temps r el dans les probl mes en cours limit s written by Fabrice Chauvet and published by . This book was released on 1999 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, nous montrons l'intérêt d'étudier des systèmes de production présentant les deux caractéristiques suivantes. Tout d'abord, les durées des opérations à réaliser sont choisies dans des intervalles donnes - de tels systemes de gestion de fabrication sont dits à temps opératoires contrôlables -. De plus, les opérations successives réalisées sur chaque produit se suivent sans temps d'attente - de tels systèmes sont dits sans attente -. Ces deux caractéristiques permettent de gérer en temps réel un large éventail de systèmes de fabrication. En outre, cette approche permet le contrôle des en-cours et des temps de fabrication. La productivité du système de fabrication est optimisée grâce à des algorithmes originaux. L'analyse de la complexité des dix-sept algorithmes proposés prouve leur compatibilité avec leur utilisation en temps réel
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 Your Mindful Compass written by Andrea Maloney Schara and published by . This book was released on 2013-12-01 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Your Mindful Compass" takes us behind the emotional curtain to see the mechanisms regulating individuals in social systems. There is great comfort and wisdom in knowing we can increase our awareness to manage the swift and ancient mechanisms of social control. We can gain greater flexibility by seeing how social controls work in systems from ants to humans. To be less controlled by others, we learn how emotional systems influence our relationship-oriented brain. People want to know what goes on in families that give rise to amazing leaders and/or terrorists. For the first time in history we can understand the systems in which we live. The social sciences have been accumulating knowledge since the early fifties as to how we are regulated by others. S. Milgram, S. Ashe, P. Zimbardo and J. Calhoun, detail the vulnerability to being duped and deceived and the difficulty of cooperating when values differ. Murray Bowen, M.D., the first researcher to observe several live-in families, for up to three years, at the National Institute of Mental Health. Describing how family members overly influence one another and distribute stress unevenly, Bowen described both how symptoms and family leaders emerge in highly stressed families. Our brain is not organized to automatically perceive that each family has an emotional system, fine-tuned by evolution and "valuing" its survival as a whole, as much as the survival of any individual. It is easier to see this emotional system function in ants or mice but not in humans. The emotional system is organized to snooker us humans: encouraging us to take sides, run away from others, to pressure others, to get sick, to blame others, and to have great difficulty in seeing our part in problems. It is hard to see that we become anxious, stressed out and even that we are difficult to deal with. But "thinking systems" can open the doors of perception, allowing us to experience the world in a different way. This book offers both coaching ideas and stories from leaders as to strategies to break out from social control by de-triangling, using paradoxes, reversals and other types of interruptions of highly linked emotional processes. Time is needed to think clearly about the automatic nature of the two against one triangle. Time and experience is required as we learn strategies to put two people together and get self outside the control of the system. In addition, it takes time to clarify and define one's principles, to know what "I" will or will not do and to be able to take a stand with others with whom we are very involved. The good news is that systems' thinking is possible for anyone. It is always possible for an individual to understand feelings and to integrate them with their more rational brains. In so doing, an individual increases his or her ability to communicate despite misunderstandings or even rejection from important others. The effort involved in creating your Mindful Compass enables us to perceive the relationship system without experiencing it's threats. The four points on the Mindful Compass are: 1) Action for Self, 2) Resistance to Forward Progress, 3) Knowledge of Social Systems and the 4) The Ability to Stand Alone. Each gives us a view of the process one enters when making an effort to define a self and build an emotional backbone. It is not easy to find our way through the social jungle. The ability to know emotional systems well enough to take a position for self and to become more differentiated is part of the natural way humans cope with pressure. Now people can use available knowledge to build an emotional backbone, by thoughtfully altering their part in the relationship system. No one knows how far one can go by making an effort to be more of a self-defined individual in relationships to others. Through increasing emotional maturity, we can find greater individual freedom at the same time that we increase our ability to cooperate and to be close to others.
Download or read book Le Golfe Du Saint Laurent petit Oc an Ou Grand Estuaire written by Canada. Department of Fisheries and Oceans and published by Peches Et Oceans Direction Generale Des Communications = Fisheries and Oceans Communications Dir. This book was released on 1991 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a workshop, the scientific reviews and the contributed papers presented at the symposium. The document presents a brief historical summary of marine research in the Gulf; reports the discussions, conclusions and recommendations of the different working groups on oceanography (physics, biology, chemistry and sedimentology) and on the fishery (fish and invertebrates); then presents the discussions of each multidisciplinary working group, centered around how the St. Lawrence system may be used as a natural laboratory which will contribute to the solution of major long-term problems of conservation of natural resources and of the quality of the environment.
Download or read book After Lean Production written by Thomas A. Kochan and published by Cornell University Press. This book was released on 1997 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industrial relations experts from eleven countries consider the state of the automobile industry worldwide.
Download or read book Kompass Belgium written by and published by . This book was released on 1991 with total page 2084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.
Download or read book Preservation of Archives in Tropical Climates written by René Teygeler and published by . This book was released on 2001 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Global Guidance Principles for Life Cycle Assessment Databases written by Guido Sonnemann and published by United Nations Publications. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The publication provides guidance principles for Life Cycle Assessment (LCA) databases; this includes how to collect raw data, how to develop datasets and how to manage databases. It also addresses questions concerning data documentation and review, coordination among databases, capacity building and future scenarios. LCA databases provide fundamental energy, materials, land, water consumption data and emissions data into water, air and soil for a wide range of processes, products and materials. In this way the publication provides the bridge between the data users and the data providers, making basic information easily accessible for computing the environmental footprints of materials and products that are key to make and judge green claims and to allow institutional and individual consumers to make informed consumption choices.
Download or read book The Planetarium written by Nathalie Sarraute and published by Deep Vellum Publishing. This book was released on 2023-01-31 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: A young writer has his heart set on his aunt's large apartment. With this seemingly simple conceit, the characters of The Planetarium are set in orbit and a galaxy of argument, resentment, and bitterness erupts. Telling the story from various points of view, Sarraute focuses below the surface, on the emotional lives of the characters in a way that surpasses even Virginia Woolf. Always deeply engaging, The Planetarium reveals the deep disparity between the way we see ourselves and the way others see us.
Download or read book Life Cycle Impact Assessment written by Michael Z. Hauschild and published by Springer. This book was released on 2015-03-24 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a detailed presentation of the principles and practice of life cycle impact assessment. As a volume of the LCA compendium, the book is structured according to the LCIA framework developed by the International Organisation for Standardisation (ISO)passing through the phases of definition or selection of impact categories, category indicators and characterisation models (Classification): calculation of category indicator results (Characterisation); calculating the magnitude of category indicator results relative to reference information (Normalisation); and converting indicator results of different impact categories by using numerical factors based on value-choices (Weighting). Chapter one offers a historical overview of the development of life cycle impact assessment and presents the boundary conditions and the general principles and constraints of characterisation modelling in LCA. The second chapter outlines the considerations underlying the selection of impact categories and the classification or assignment of inventory flows into these categories. Chapters three through thirteen exploreall the impact categories that are commonly included in LCIA, discussing the characteristics of each followed by a review of midpoint and endpoint characterisation methods, metrics, uncertainties and new developments, and a discussion of research needs. Chapter-length treatment is accorded to Climate Change; Stratospheric Ozone Depletion; Human Toxicity; Particulate Matter Formation; Photochemical Ozone Formation; Ecotoxicity; Acidification; Eutrophication; Land Use; Water Use; and Abiotic Resource Use. The final two chapters map out the optional LCIA steps of Normalisation and Weighting.
Download or read book Making Better International Law The International Law Commission at 50 Proceedings of the United Nations Colloquium on Progressive Development and Codification of International Law written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
