Abstract
The purpose of this paper is to combine the concept of fuzzy sets to represent more realistic situations with the well-established traditional queueing models. Information and data of a queueing model are incomplete frequently, when they are very little and there is no information about the model or some parameters of the model are vague.In that case, they may be sometimes given by experts subjectively. Therefore, it is neccessary to employ subjective probabilities for the queueing model of which information and data are including some fuzziness. In this paper, a fuzzy M/M/s queueing model is proposed as a fuzzification of an ordinary M/M/s queueing model. We also apply fuzzy set theory to the closed multiclass model with the fuzzy queues and the mixed multiclass model in which each node consists of fuzzy queues. Thus, we represent the characteristic and performance of the closed multiclass model and the mixed multiclass model based on the proposed fuzzy queueing system.
