Abstract. A function is exponentially concave if its exponential is concave. We consider exponentially concave functions on the unit simplex. It is known that gradient maps of exponentially concave functions are solutions of a MongeKantorovich optimal transport problem and allow for a better gradient approximation than those of ordinary concave functions. The approximation error, called L-diver...

In this article, by using fuzzy AHP and TOPSIS technique we propose a new method for project selection problem. After reviewing four common methods of comparing alternatives investment (net present value, rate of return, benefit cost analysis and payback period) we use them as criteria in AHP tree. In this methodology by utilizing improved Analytical Hierarchy Process by Fuzzy set theory, first...

The purpose of this paper is to extend [Ouyang, L. Y., Chuang, B. R. (2001). A periodic review inventory-control system with variable lead time. International Journal of Information and Management Sciences, 12, 1–13] periodic review inventory model with variable lead time by considering the fuzziness of expected demand shortage and backorder rate. We fuzzify the expected shortage quantity at th...

In Suichang gold mine, the altered rock type deposits were cut by faults and joint fissures, leading to complex resource endowment characteristics, large changes in occurrence, a serious of ore vein branches great difficulty mining. order select suitable mining method for such difficult complicated orebody, multi-factor multi-index comprehensive evaluation system involving benefits, costs, safe...

Abstract The main objective of this article is to lay the foundations a novel multi-criteria optimization technique, namely, complex Pythagorean fuzzy N -soft VIKOR (CPFNS-VIKOR) method that highly proficient express great deal linguistic imprecision and vagueness inherent in human assessments. This strategy provides versatile decision-making tool for ranking-based modeling two-dimensional para...

Financial mangers bave to make decisions Ilnder many restrictions and often have to deal with vague and imprecise information. In multicriteria problems, the best solution is sought in a set X of alternatives under certain constraints with rates of contentment,ili : X ~ [0,1]. Considering these rates as membership fnnctions, the tools that fuzzy logic provides Is adeqll3te to solving a multicri...