Navegando por Autor "Borenstein, Denis"
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Artigo Enhancing the discrimination of alternatives in Fuzzy-Topsis(Taylor and Francis, 2017-02-06) Santi, Éverton; Ferreira, Luciano; Borenstein, DenisFuzzy-TOPSIS is one of the most widely applied methods for solving multi-attribute decision making problems. However, an analysis of academic and real-life applications of this method has pointed out that the final alternative scores are very close, with little dispersion among them, making it difficult for the decision makers’ to choice/ranking the alternatives. The main objective of this paper is to enhance the ability of Fuzzy-TOPSIS to discriminate alternatives, making it easy for a decision maker to select or ranking alternatives. To achieve this, we redefined the computation of the positive and negative ideal solution of the classical TOPSIS method as a combination of the fuzzy concordance and discordance indexes from Fuzzy-ELECTRE. The proposed model was validated in a real case study, and further compared with Fuzzy-ELECTRE, using simulation experiments, and Fuzzy-TOPSIS, using results from four recent papers published in the literature. The results obtained show that the proposed method improved the ranking and sorting of the alternatives for all analyzed cases, considering ranking dispersion, global interval range of the scores, and the difference between the first and second best alternatives. The main justification for this behavior is the partial non-compensatory nature of our method, introduced by incorporating some ELECTRE’s elements into Fuzzy-TOPSISArtigo Hybrid fuzzy MADM ranking procedure for better alternative discrimination(Elsevier, 2016-04) Ferreira, Luciano; Borenstein, Denis; Santi, ÉvertonIn this paper, we propose a hybrid fuzzy decision making approach, combining elements of fuzzy-ELECTRE and Fuzzy-TOPSIS, towards a new ranking procedure. The main objective of FETOPSIS is to offer rankings with good alternative discriminatory power to decision makers (DMs). This research work was motivated by a real case study in which multiple attribute decision making techniques were used to select the best set of investment projects for the industrial restructuring of a small oil company in Brazil. After the application of Fuzzy-TOPSIS and ELECTRE II, the obtained rankings were quite deceptive from the DMs׳ point of view, either to very close scores or by the excess of indifferences among alternatives. Our developed approach uses the closeness coefficients to rank the alternatives, following Fuzzy-TOPSIS, however they are computed over the normalized fuzzy concordance and discordance indexes based on the ELECTRE family. Extensive computational experiments were performed to evaluate our method. The good results obtained by FETOPSIS in the experiments, both in terms of alternative discriminatory power of rankings, and eliminating ranking reversal cases, gave us the confidence to apply the method in the real case. The DMs praised the developed approach, since the obtained rankings were more discriminatory in the alternatives than both Fuzzy-TOPSIS and ELECTRE II, making it possible to select with confidence a set of suited alternativesDissertação Modelo em dinâmica de sistemas para gestão de aeroportos brasileiros(Universidade Federal do Rio Grande do Norte, 2013-03-19) Marcos, Antonio Rodolfo Araújo; Ferreira, Luciano; ; ; http://lattes.cnpq.br/2666911257203493; Almeida, Mariana Rodrigues de; ; http://lattes.cnpq.br/7356242205950550; Borenstein, Denis; ; http://lattes.cnpq.br/8373564643000623A importância do setor aéreo no desenvolvimento de um país nos remete a necessidade da realização de estudos sobre gerenciamento de aeroportos, visando auxiliar o processo de tomada de decisões. No Brasil, o crescimento da demanda de passageiros é motivo de investimentos com intuito de equilibrar a capacidade de um aeroporto com a demanda aérea. Diante disso, o trabalho tem como objetivo desenvolver um modelo em Dinâmica dos Sistemas capaz de auxiliar a gestão aeroportuária brasileira no dimensionamento dos subsistemas de um aeroporto (Terminal de Passageiros, Pista e Pátio). A metodologia do trabalho consistiu nas etapas de definição do problema, formulação da hipótese dinâmica, construção do modelo de simulação, validação e experimentos. Por fim, analisou a situação de cada subsistema em treze aeroportos brasileiros nos cenários atual, mais provável e otimista para a demanda aérea de passageiros