Suchergebnisse

Le projet AG-MEMOD réunit 24 pays partenaires avec l'objectif commun de réaliser un outil capable de simuler des scénarios de politique sur 30 marchés de produits agricoles, avec des résultats annuels à un horizon de 10 ans, pour l'Europe entière ainsi que pour chaque pays. Un outil informatique convivial et accessible a été développé pour combiner les modèles estimés économétriquement par chaque partenaire. Le modèle AG-MEMOD combiné est un système constitué des deux logiciels Excel et Gams. Il ne nécessite pas de modifications du code Gams pour fonctionner : L'implémentation des scénarios et l'accès aux résultats se fait dans l'environnement familier d'Excel. Le papier traite de la structuration de l'information dans le système et de la manière dont les équations sont encodées dans le langage Gams facilement interprétable.

AbstractOne approach to the evaluation of the performance of multiprogranmed computer systems includes the development of Monte Carlo simulations of transitions of programs within such systems, and their strengthening by control variable and concomitant variable methods. An application of such a combination of analytical, numerical, and Monte Carlo approaches to a model of system overhead in a paging machine is presented.

ABSTRACTThe design of distributed computer systems (DCSs) requires compromise among several conflicting objectives. For instance, high system availability conflicts with low cost which in turn conflicts with quick response time. This paper presents an approach, based on multi‐criteria decision‐making techniques, to arrive at a good design in this multiobjective environment. An interactive procedure is developed to support the decision making of system designers. Starting from an initial solution, the procedure presents a sequence of non‐dominated vectors to designers, allowing them to explore systematically alternative possibilities on the path to a final design. The model user has control over trade‐offs among different design objectives. This paper focuses on the details of the mathematical model used to provide decision support. Accordingly, a formulation of DCS design as a multicriteria decision problem is developed. The exchange search heuristic used to generate nondominated solutions also is presented. We argue that multicriteria models provide a more realistic formulation of the DCS design problem than the single‐criterion models used widely in the literature. While obtaining a clear definition of design objectives (single or multiple) is an important activity, by explicitly acknowledging the trade‐offs among multiple objectives in the design process, our methodology is more likely to produce a better overall design than methods addressing a single criterion in isolation.

The main campus of the University of Illinois, commonly known as the UI-UC campus, is located at the twin cities of Urbana-Champaign, about 135 miles south of Chicago, Illinois, U.S.A. The campuses of Chicago Circle and the Medical Center, both located in Chicago, are other components of the University of Illinois system. Many departments and colleges of the UI-UC campus, especially in the fields of science and technology, have outstanding reputations for research achievement. The University Library ranks first in size among state universities and third among all universities in the United States. Its total collection reaches approximately 5.5 million volumes.

V Polsku i ve většině zemí Evropské Unie je jedním z nejvýznamnějších problémů, které nejsou jen sociální, je stále vysoká nemocnost chorobami z povolání v různých oblastech národního hospodářství. Článek uvádí hlavní principy počítačovéhosystému zabezpečujícího hodnocení hygienického rizik v důlních podmínkách (Pawłowska, Zawieska 1997). Počítačový systém využívá zásady ukazatelové metody hodnocení hygienicého rizika, které byla vyvinuta na Ústavě ergonomiky a bezpečnostního řízení na Slezské Polytechnice v Gliwicích (Krzemień, Mocek 1998, Krzemień, Mocek 1999). ; Both in Poland and in most countries of European Union among the most important problems, which are not only the social ones, ranks a permanently high occupational disease rate among workers of divers national economy domains. This state results from many causes, the most important of which are the following: exposure of a high percentage of workers to action of one or several noxious factors during technological process, exceeding limit values of specific factors existing in workplace, wrong identification of noxious factors and a long-term delay of gaining of results of action of health hazards, which makes difficult to accomplish a proper health risk evaluation in the workplace (Pawłowska, Zawieska 1997). By this article main principles of a computer system supporting health risk evaluation in mining conditions are presented. The computer system utilizes principles of indexing method of health risk evaluation which has been elaborated by Institute of Ergonomics and Safety Management of Technical University of Silesia (Krzemień, Mocek 1998, Krzemień, Mocek 1999).

"25 June 1985". ; Cover title. ; Bibliography: p. 39-41. ; Mode of access: Internet.