Large Scale Optimization Problem
Mostrando 1-12 de 19 artigos, teses e dissertações.
-
1. A New Hybrid Preconditioner for the Interior Point Method
RESUMO Este trabalho visa melhorar o cálculo da direção de busca no Método de Pontos Interiores primal-dual usando métodos iterativos precondicionados. Trata-se de uma abordagem híbrida que combina o precondicionador Fatoração Controlada de Cholesky e o precondicionador Separador. Esta abordagem tem mostrado bons resultados, entretanto, nesses préco
TEMA (São Carlos). Publicado em: 16/09/2019
-
2. Modeling and optimization of cylindrical grinding of Al/SiC composites using genetic algorithms
The Al/SiC composites have received more commercial attention than other kinds of Metal Matrix Composites (MMCs) due to their high performance. However, a continuing problem with MMCs is that they are difficult to machine, due to the hardness and abrasive nature of the SiC particles. Grinding is often the method of choice for machining Al/SiC composites to a
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
-
3. HIBRIDIZAÇÃO DE MÉTODOS EXATOS E HEURÍSTICOS PARA RESOLUÇÃO DE PROBLEMAS DE OTIMIZAÇÃO COMBINA / HYBRIDIZATION OF EXACT AND HEURISTIC METHODS TO SOLVE COMBINATORIAL OPTIMIZATION PROBLEM
A recente evolução dos computadores como também dos métodos exatos oriundos da programação matemática, muitos destes eficientemente implementados em otimizadores comerciais, propiciou o surgimento de novos algoritmos, denominados metaheurísticas híbridas, que têm sido aplicados para resolução de problemas combinatoriais. Este trabalho apresenta a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/03/2011
-
4. Heuristics for implementation of a hybrid preconditioner for interior-point methods
This article presents improvements to the hybrid preconditioner previously developed for the solution through the conjugate gradient method of the linear systems which arise from interior-point methods. The hybrid preconditioner consists of combining two preconditioners: controlled Cholesky factorization and the splitting preconditioner used in different pha
Pesquisa Operacional. Publicado em: 2011-12
-
5. Dynamic optimization of a FCC converter unit: numerical analysis
Fluidized-bed Catalytic Cracking (FCC) is a process subject to frequent variations in the operating conditions (including feed quality and feed rate). The production objectives usually are the maximization of LPG and gasoline production. This fact makes the FCC converter unit an excellent opportunity for real-time optimization. The present work aims to apply
Brazilian Journal of Chemical Engineering. Publicado em: 2011-03
-
6. Comparing stochastic optimization methods to solve the medium-term operation planning problem
The Medium-Term Operation Planning (MTOP) of hydrothermal systems aims to define the generation for each power plant, minimizing the expected operating cost over the planning horizon. Mathematically, this task can be characterized as a linear, stochastic, large-scale problem which requires the application of suitable optimization tools. To solve this problem
Computational & Applied Mathematics. Publicado em: 2011
-
7. Estudo do aumento do desempenho de um sistema de tomografia de impedância elétrica através do método de otimização topológica. / Increasing electrial impedance tomography system performance through the topology optimization method.
Electrical Impedance Tomography images the interior of a body based on electrical quantities measured on the surface of it. Mathematically, the technique finds the electric admittivity distribution in a given body model which reproduces the boundary measurements of electric currents and potentials on electrodes attached to that body. Therefore, the admittivi
Publicado em: 2010
-
8. Fuzzy inference systems approach for long term hydrothermal scheduling / Sistema de inferencia nebulosa ao planejamento da operação hidrotermica de medio prazo
The long term hydrothermal scheduling lies in the optimization of the water resource usage through the maximization of the hydroelectric production and the minimization of the thermal plants operation. Its goal is to assure an economic and reliable load supply throughout the study stages. This problem can be characterized by exhibiting a complex nature, sinc
Publicado em: 2009
-
9. Optimization of coupled process: planning production and cutting stock / Otimização de processos acoplados: programação da produção e corte de estoque
Em diversas indústrias de manufatura (por exemplo, papeleira, moveleira, metalúrgica, têxtil) as decisões do dimensionamento de lotes interagem com outras decisões do planejamento e programação da produção, tais como, a distribuição, o processo de corte, entre outros. Porém, usualmente, essas decisões são tratadas de forma isolada, reduzindo o
Publicado em: 2009
-
10. Técnicas de aumento de eficiência para metaheurísticas aplicadas a otimização global contínua e discreta / Efficiency--enhancement techniques for metaheuristics applied and continuous global optimization
Several real-world problems from various fields of Science and Engineering can be modeled as global optimization problems. In general, complex and large-scale problems can not be solved eficiently by exact techniques. In this context, Probabilistic algorithms, such as metaheuristics, have shown relevant results. Nevertheless, as the complexity of the problem
Publicado em: 2009
-
11. Transmission systems expansion planning considering security and generation programming plans / Planejamento da expansão de sistemas de transmissão considerando segurança e planos de programação da geração
This Ph.D. thesis presents some proposals to solve the transmission network expansion planning problem, static and multistage, taking into account security constraints - (n _ 1) security criterium, and the transmission expansion planning to satisfy some generation programming plans. Trying to find optimal solutions to large scale power systems, the specializ
Publicado em: 2005
-
12. OTIMIZAÇÃO DE PORTFÓLIO DE CONTRATOS DE ENERGIA EM SISTEMAS HIDROTÉRMICOS COM DESPACHO CENTRALIZADO / PORTFOLIO OPTIMIZATION OF ENERGY CONTRACTS IN HYDROTHERMAL SYSTEMS WITH CENTRAL DISPATCH
Portfolio optimization has been widely used to select investments in the financial area. The first proposal in this topic was the Markowitz mean-variance approach, which uses, respectively, the mean and the variance as measures of portfolio return and risk. Since Markowitz many other approaches, which adopt alternative risk measures, have been proposed, e.g.
Publicado em: 2004