Transformation Linear Membership Function by Using the Modified S- Curve

In this paper, we concentrate on two cases of fuzzy linear programming problems (FLPP): LPP with coefficient of objective function and coefficient of available resources and constraint are trapezoidal and triangular of fuzzy numbers respectively. Though by using - cut ,fuzzy numbers (fuzzy triangular and fuzzy trapezoidal ) can be transformed into interval numbers and by taking one type of non-linear membership function this meant logistic function, we propose here the "modified S-curve function by simplex method ".Key words: Fuzzy linear programming, fuzzy triangular, fuzzy trapezoidal, fuzzy number, modified S-curve function, fuzzy simplex method.