Encontrados 19 documentos, a visualizar página 1 de 2
Comparação de dois algoritmos genéticos aplicados ao TOP
Oliveira, José A.; Ferreira, João; Figueiredo, Manuel; Dias, Luís M. S.; Pereira, GuilhermeA recolha seletiva de resíduos sólidos urbanos para reciclagem é um processo dispendioso, especialmente quando realizado em grande escala. Um problema importante neste processo reside na gestão de uma frota, uma vez que atualmente as estratégias utilizadas geralmente têm baixa eficiência. O processo de recolha seletiva de resíduos sólidos urbanos pode ser modelado como um problema de encaminhamento de veículos,...
A flexible decision support tool for maintenance float systems : a simulation a...
Peito, Francisco; Pereira, Guilherme; Leitão, Armando; Dias, Luís M. S.; Oliveira, José A.This paper is concerned with the use of simulation as a decision support tool in maintenance systems, specifically in MFS (Maintenance Float Systems). For this purpose and due to its high complexity, in this paper the authors explore and present a way to develop a flexible MFS model, for any number of machines in the workstation, spare machines and maintenance crews, using Arena simulation language. Also in thi...
A flexible decision supporttool for maintenance float systems - a simulation ap...
Peito, Francisco; Pereira, Guilherme; Leitão, Armando; Dias, Luis; Oliveira, José A.This paper is concerned with the use of simulation as a decision support tool in maintenance systems, specifically in MFS (Maintenance Float Systems). For this purpose and due to its high complexity, in this paper the authors explore and present a way to develop a flexible MFS model, for any number of machines in the workstation, spare machines and maintenance crews, using Arena simulation language. Also in thi...
Sequencing activities in a project network considering resource complementarity
Silva, Hélder C.; Tereso, Anabela Pereira; Oliveira, José A.Project management is a methodology widely used in organizations that believe in innovation and choose to organize their resources around projects. This paper presents new results and developments of a model that address the issue of optimal resource allocation, and more specifically, the analysis of complementarity of resources (primary resource and supportive resource) in a project. The concept of complementa...
Sequencing activities in a project network using resource complementarity model
Silva, Hélder C.; Tereso, Anabela Pereira; Oliveira, José A.The methodology of project management has been widespread in organizations of different functions and sizes. In this context, we address the issue of optimal resource allocation, and more specifically, the analysis of complementarity of resources (primary resource and supportive resource) in a project. We develop a conceptual system capable of determining the ideal timing, and the ideal mixture of resources all...
Modeling and simulating a textile production system
Oliveira, Sérgio; Oliveira, José A.; Dias, Luís M. S.; Pereira, GuilhermeThis paper presents a study for a production scheduling problem in a textile company, specifically in the weaving preparation area. Basically, the processing orders can be considered as sequential working steps trough three operations (charging - weaving - discharging), and the goal is to minimize time variation and to avoid delays. The machine utilization should be as higher as possible due to short delivering...
A genetic algorithm for project scheduling in activity networks under resource ...
Silva, Hélder C.; Oliveira, José A.; Tereso, Anabela PereiraWe address the issue of optimal resource allocation, and more specifically, the analysis of complementarity of resources (primary resource or P-resource and supportive resource or S-resource) to activities in a project. The concept of complementarity can be incorporated into the engineering domain as an enhancement of the efficacy of a "primary" resource (P-resource) by adding to it other "supportive" resources...
Sequencing activities in a project network with resource complementarity : furt...
Silva, Hélder C.; Tereso, Anabela Pereira; Oliveira, José A.We address the issue of optimal resource allocation, and more specifically, the analysis of complementarity of resources (primary resource or P-resource and supportive resource or S-resource) to activities in a project. In this paper we present new computational results of a Genetic Algorithm, based in a random keys alphabet.
Discrete simulation tools ranking : a commercial software packages comparison b...
Pereira, Guilherme; Dias, Luís M. S.; Vik, Pavel; Oliveira, José A.This paper documents a work on all-purpose discrete event simulation tools evaluation. Selected tools must be suitable for process design (e.g. manufacturing or services industries). Rather than making specific judgements of the tools, authors, tried to measure the intensity of usage or presence in different sources, which they called "popularity". It was performed in several different ways, including occurrenc...
Um algoritmo genético para programação de projectos em redes de actividades com...
Silva, Hélder C.; Oliveira, José A.; Tereso, Anabela PereiraNeste artigo abordamos a questão da alocação óptima dos recursos, mais especificamente, a análise da complementaridade dos recursos (recurso principal ou recurso-P e do recurso de suporte ou recurso-S) às actividades de um projecto. Neste artigo apresenta-se um algoritmo genético, baseado num alfabeto de chaves aleatórias, e analisa-se o procedimento para criar soluções a partir de um cromossoma. ; We address ...
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