A fuzzy goal programming approach is applied in this paper for solving the vendor selection problem with multiple objectives, in which some of the parameters are fuzzy in nature. A vendor selection problem has been formulated as a fuzzy mixed integer goal programming vendor selection problem that includes three primary goals: minimizing the net cost, minimizing the net rejections, and minimizin...

We extend the classical dynamic advertising model of M. Nerlove and J. Arrow [11] adding a spatial dimension. We consider the general mixed problem of maximizing a utility function of product image at a fixed time and minimizing the corresponding cumulative cost of advertising. After an abstract treatment allowing for general utility and cost functions, as well as state and control constraints,...

We discuss a nite element method based on the mixed least-squares formulation. The cost functional turns out to be a polynomial so that its gradient and Hessian can be computed eeciently. A multi-level Newton iteration is introduced for minimizing the cost functional that can converge from a rough initial guess. Error estimates are derived which not only are optimal in certain connguration, but...

the problem of staff scheduling at a truck hub for loading and stripping of the trucks is an important and difficult problem to optimize the labor efficiency and cost. the trucks enter the hub at different hours a day, in different known time schedules and operating hours. in this paper, we propose a goal programming to maximize the labor efficiency via minimizing the allocation cost. the propo...

TWO-MACHINE FLOWSHOP SCHEDULING WITH FLEXIBLE OPERATIONS AND CONTROLLABLE PROCESSING TIMES Zeynep Uruk M.S. in Industrial Engineering Advisor: Prof. Dr. Selim Aktürk Co-Advisor: Asst. Prof. Dr. Hakan Gültekin August, 2011 In this study, we consider a two-machine flowshop scheduling problem with identical jobs. Each of these jobs has three operations, where the first operation must be performed ...

perishability of blood products as well as uncertainty in demand amounts complicate the management of blood supply for blood centers. this paper addresses a mixed-integer linear programming model for blood platelets production planning while integrating the processes of blood collection as well as production/testing, inventory control and distribution. whole blood-derived production methods for...