992 resultados para Cobertura (Engenharia)


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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The Set Covering Problem (SCP) plays an important role in Operational Research since it can be found as part of several real-world problems. In this work we report the use of a genetic algorithm to solve SCP. The algorithm starts with a population chosen by a randomized greedy algorithm. A new crossover operator and a new adaptive mutation operator were incorporated into the algorithm to intensify the search. Our algorithm was tested for a class of non-unicost SCP obtained from OR-Library without applying reduction techniques. The algorithms found good solutions in terms of quality and computational time. The results reveal that the proposed algorithm is able to find a high quality solution and is faster than recently published approaches algorithm is able to find a high quality solution and is faster than recently published approaches using the OR-Library.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Física - FC

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Pós-graduação em Agronomia - FEIS

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Pós-graduação em Ciência Odontólogica - FOA

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Pós-graduação em Agronomia (Produção Vegetal) - FCAV

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Pós-graduação em Geociências e Meio Ambiente - IGCE

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Pós-graduação em Engenharia Elétrica - FEIS

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Pós-graduação em Comunicação - FAAC

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Pós-graduação em Educação - FFC

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This work addresses the erosion caused by rain, describing their steps and factors that most influence the intensity and volume of transported material. The work presents the Universal Soil Loss Equation that quantifies the erosion, with the influence of different factors that affect it. The following notes the occurrence of this process in cutting slopes. They suffer with removal of the vegetation and surface soil layer, making them even more susceptible to this process. In this way it's necessary a protection model for the slopes. Some protection methods are presents with their main features, advantages and disadvantages, implementation process, especially to survey the approximate cost of each method and their application restrictions