Fuzzy Inventory Model for Deteriorating Item by Using Signed Distance Method in which Inventory Parameters are Treated as Pfn

While the development and application of fuzzy inventory control models of deteriorating item is one of the main concerns of researchers and practitioners, most studies done in this field till trapezoidal fuzzy numbers by using different method. In this paper at first we study researches done on PFN by signed distance method to defuzzify the total cost function .In which demand increase with time and shortage are fully backlogged. In previous paper we have already discussed about PFN by using graded mean representation method to defuzzify.Then by, comparison of developed models some theoretical and practical results are derived and various directions are suggested for future research.