Cost Minimization Problem
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. Método de Otimização Topológica em Estruturas Tridimensionais
The topology optimization problem characterize and determine the optimum distribution of material into the domain. In other words, after the definition of the boundary conditions in a pre-established domain, the problem is how to distribute the material to solve the minimization problem. The objective of this work is to propose a competitive formulation for
Publicado em: 2006
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14. Optimal dispatch of generating units in hydroelectric systems by heuristic based on langrangean relaxation and dynamic programming / Despacho otimo de unidades geradoras em sistemas hidreletricos via heuristica baseada em relaxação lagrangeana e programação dinamica
The daily scheduling operation of the electrical energy system has by target to find the dispatch generation to the next day which must be compatible with the daily generation target defined by the energy planning models and to be an operational guide. Because of its proximity with the real time operation the modeling must represent the main characteristic o
Publicado em: 2006
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15. BID-BASED STRATEGIES FOR HYDRO PLANTS IN A MULTI-STAGE AND STOCHASTIC FRAMEWORK / ESTRATÉGIA DE OFERTA DE AGENTES HIDROELÉTRICOS SOB INCERTEZA E MÚLTIPLOS ESTÁGIOS
The objective of this work is to present a methodology for the strategic bidding (or bid-based) problem of a hydropower based company, taking into account multiple hydro plants, time-coupling, multiple inflow scenarios and illustrate its application for real case studies. It is initially show that the bid-based dispatch for a hydro plant can be formulated as
Publicado em: 2004
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16. Using quantitative information for efficient association rule generation
The solution of the mining association rules problem in customer transactions was introduced by Agrawal, Imielinski and Swami in 1993. Their approach was extended in several directions such as adding or replacing the confidence and support by other measures, or how to also account for quantitative attributes. In this paper we present an algorithm that can be
Journal of the Brazilian Computer Society. Publicado em: 2000
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17. Descrição unificada de metodos de estimação DOA em arranjo de sensores
This work is concerned with the direction-of-arrival estimation of plane waves impinging on a sensors array. This problem arises from applications such as radar, sonar and, more recently, in wireless communications. Among the usual parameter estimation methods, the parametric ones are more accurate than the spectral ones. In this work the parametric methods
Publicado em: 2000
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18. Aspectos operacionais e estruturais em "retrofit" de redes de trocadores de calor
The study of retrofit procedures for heat exchanger networks has been subject of numerous research work, due to its importance in inergy-saving policies in chemical processes. Early work focused on the cost (and area) estimation of the additional exchangers required to achieve the new process conditions, without considering the layout of the existing network
Publicado em: 1999
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19. Integrated structural/control optimization of a large space structure with articulation subject to the gravity-gradient torque.
Optimization has been playing a very important role in the orbit and attitude control, and structural design of spacecraft since the advent of the space era. It is well known that weight, space, energy, and time are among the most important constraints that guide the space missions planning. the optimization has a wide field of applications even if only the
Publicado em: 1998
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20. Planejamento da expansão da geração de sistemas hidrotermicos de potencia, otimizando os usos multiplos da agua dos reservatorios
A substantial contribution to the development of generation expansion planninq for hydrothermal power systems is aimed at in this work. The possible multiple uses of the water from candidate hydro plant reservoirs are considered, employinq conversational techniques of multiobjective programminq. Initially, a modeling based on linear programming is presented
Publicado em: 1990
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21. GEOMETRIC PROGRAMMING, CHEMICAL EQUILIBRIUM, AND THE ANTI-ENTROPY FUNCTION*
The culmination of this paper is the following duality principle of thermodynamics: maximum S = minimum S*. (1) The left side of relation (1) is the classical characterization of equilibrium. It says to maximize the entropy function S with respect to extensive variables which are subject to certain constraints. The right side of (1) is a new characterization