This article presents a cuckoo search algorithm, via Lévy flight, considering the effects of coevolution on the displacement dynamics of animal communities, and applies this algorithm to the development of maximally distributed physical arrangements. Some variables are introduced such as egg weight and the acquired learning of host birds. The results show that the proposed algorithm prevails, in the majority of the interviewed instances, in the degree of distribution in comparison with the classic TARGET and ALVO methods, and with the Genetic Algorithm. The proposed algorithm was shown to be able to obtain a low degree of distribution in a satisfactory computational time, especially in large problems.
Recently, new types of layouts have been proposed in the literature in order to handle a large number of products. Among these are the fractal layout, aiming at minimization of routing distances. There are already researchers focusing on the design; however, we have noticed that the current approach usually executes several times the allocations of fractal cells on the shop floor up to find the best allocations, which may present a significant disadvantage when applied to a large number of fractal cells owing to combinatorial features. This paper aims to propose a criterion, based on similarity among fractal cells, developed and implemented in a Tabu search heuristics, in order to allocate it on the shop floor in a feasible computational time. Once our proposed procedure is modeled, operations of each workpiece are separated in n subsets and submitted to simulation. The results (traveling distance and makespan) are compared to distributed layout and to functional layout. The results show, in general, a trade-off behavior, that is, when the total routing distance decreases, the makespan increases. Based on our proposed method, depending on the value of segregated fractal cell similarity, it is possible to reduce both performance parameters. Finally, we conclude the proposed procedure shows to be quite promising because allocations of fractal cells demand reduced central processing unit time.
São Carlos -SP 2005 2 DEDICATÓRIA Confia no Senhor e faze o bem; assim habitarás na terra, e te alimentarás em segurança. Deleita-te também no Senhor, e Ele te concederá o que deseja o teu coração. Entrega o teu caminho ao Senhor; confia Nele, e Ele tudo fará. (Salmos 37:3~5). Ao Deus Triúno, minha fonte de vida e esperança. Aos meus pais, Fu e Li Chuan, minha melhor escola. Aos irmãos, Hong e Yuan, por tudo que passamos juntos. 3 AGRADECIMENTOS Ao meu orientador, Professor Titular Arthur José Vieira Porto, pela sua confiança, amizade, dedicada orientação durante a elaboração deste trabalho. À minha família, pelo seu apoio, carinho e esperança depositados em mim em todos os momentos. Aos Professores da banca examinadora, Eduardo Vila Gonçalves Filho e Silvio Pires, pelas sugestões que contribuíram para a melhoria do trabalho.Aos amigos Alessandro Silva, Luís Araújo, Elmer, Julio, Mathias e dentre outros pelas suas inestimáveis amizades em todos os momentos. À igreja evangélica projeto raízes de São Carlos por me acolher em momentos difíceis.
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