%0 Journal Article
%T A Project Scheduling Method Based on Fuzzy Theory
%J Journal of Industrial and Systems Engineering
%I Iranian Institute of Industrial Engineering
%Z 1735-8272
%A Soltani, Ahmad
%A Haji, Rasoul
%D 2007
%\ 04/01/2007
%V 1
%N 1
%P 70-80
%! A Project Scheduling Method Based on Fuzzy Theory
%K Project scheduling
%K Fuzzy theory
%K Modified backward pass (MBP)
%K Trapezoidal
fuzzy number (TFN)
%K Linear programming (LP)
%R
%X In this paper a new method based on fuzzy theory is developed to solve the project scheduling problem under fuzzy environment. Assuming that the duration of activities are trapezoidal fuzzy numbers (TFN), in this method we compute several project characteristics such as earliest times, latest times, and, slack times in term of TFN. In this method, we introduce a new approach which we call modified backward pass (MBP). This approach, based on a linear programming (LP) problem, removes negative and infeasible solutions which can be generated by other methods in the backward pass calculation. We drive the general form of the optimal solution of the LP problem which enables practitioners to obtain the optimal solution by a simple recursive relation without solving any LP problem. Through a numerical example, calculation steps in this method and the results are illustrated.
%U http://www.jise.ir/article_3918_df96a7fb6694f0b730ab1d9aa78e3c47.pdf