A fuzzy group decision support system for multifacility location problems

Multifacility location problems are considered to find optimal location of new facilities with respect to a set of existing ones. Generally, the objective of the problem is minimizing the total distance traveled between facilities. In this paper, a methodology is proposed for multifacility location problem, investigating decision makers' opinion as a group decision-making problem. Since uncertainty of information in decision-making environment exists, we consider it by applying a fuzzy set theory. At first, the problem is formulated as a fuzzy multiobjective model. After introducing a decision support system based on fuzzy inference system and using fuzzy analytic hierarchy process approach for obtaining weights between facilities, at last, a two-phase fuzzy linear programming considering the concept of degree of satisfaction of each objective is applied to solve the multiobjective problem. Finally, a numerical example is given to illustrate the proposed method and a sensitivity analysis is expressed to show capability of the method for generating different optimal solutions based on the importance of each decision maker's opinion.