We study the problem of finding an optimal assortment products maximizing expected revenue, in which customer preferences are modeled using a nested logit choice model. This is known to be polynomially solvable specific case and NP-hard otherwise, with only approximation algorithms existing literature. provide exact general method that embeds tailored Branch-and-Bound algorithm into fractional ...

This article deals with the new approach of finding defuzzification / ranking index various types fuzzy sets. Traditionally, in most articles on decision making methods are not justified respect to that highest aspiration levels. study highlights an efficient (ranking) method which links between gaps defuzzified values obtained using ?-cuts and without numbers. Moreover, for a given problem dif...

Although the Christoffel-Darboux representation (CDR) plays an important role within theory of orthogonal polynomials, and many bosonic fermionic multidimensional Schrodinger equation systems can be transformed into a moment (MER), union two effective, algebraic, eigenenergy bounding method has been overlooked. This particular fusion representations, suitable for or systems, defines Orthonormal...

In this paper, we consider the variational homotopy perturbation method (VHPM) to obtain an approximate series solution for the generalized Fisher’s equation which converges to the exact solution in the region of convergence. Comparisons are made among the variational iteration method (VIM), the exact solutions and the proposed method. The results reveal that the proposed method is very effectiv...