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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Uma abordagem por nuvem de part?culas para problemas de otimiza??o combinat?ria / A Particle Swarm Approach for Combinatorial Optimization Problems

Souza, Givanaldo Rocha de 19 May 2006 (has links)
Made available in DSpace on 2014-12-17T15:47:45Z (GMT). No. of bitstreams: 1 GivanaldoRS.pdf: 1524067 bytes, checksum: d73e18e4ae3a0bffab7711efc808bffa (MD5) Previous issue date: 2006-05-19 / Combinatorial optimization problems have the goal of maximize or minimize functions defined over a finite domain. Metaheuristics are methods designed to find good solutions in this finite domain, sometimes the optimum solution, using a subordinated heuristic, which is modeled for each particular problem. This work presents algorithms based on particle swarm optimization (metaheuristic) applied to combinatorial optimization problems: the Traveling Salesman Problem and the Multicriteria Degree Constrained Minimum Spanning Tree Problem. The first problem optimizes only one objective, while the other problem deals with many objectives. In order to evaluate the performance of the algorithms proposed, they are compared, in terms of the quality of the solutions found, to other approaches / Os problemas de otimiza??o combinat?ria t?m como objetivo maximizar ou minimizar uma fun??o definida sobre um certo dom?nio finito. J? as metaheur?sticas s?o procedimentos destinados a encontrar uma boa solu??o, eventualmente a ?tima, consistindo na aplica??o de uma heur?stica subordinada, a qual tem que ser modelada para cada problema espec?fico. Este trabalho apresenta algoritmos baseados na t?cnica de otimiza??o por nuvem de part?culas (metaheur?stica) para dois problemas de otimiza??o combinat?ria: o Problema do Caixeiro Viajante e o Problema da ?rvore Geradora M?nima Restrita em Grau Multicrit?rio. O primeiro ? um problema em que apenas um objetivo ? otimizado, enquanto o segundo ? um problema que deve lidar com m?ltiplos objetivos. Os algoritmos propostos s?o comparados a outras abordagens para o mesmo problema em quest?o, em termos de qualidade de solu??o, a fim de verificar a efici?ncia desses algoritmos

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