Miktara bağlı indirim altında tedarikçi seçimi ve dağıtım tesisi yer planlaması

The purpose of this study is to identify the locations of distribution facilities and choose the suppliers in a two echelon system where items are purchased from suppliers under quantity discount policy and distributed to customers from the facilities so as to meet the demand. We formulate the problem on hand as a mixed integer programming problem. Moreover, to handle large instances we develop heuristic algorithms one of which is a mixed integer programming based iterative algorithm where we solve the problem in each echelon in an iterative manner. Finally, we test the proposed model and heuristic algorithms on different data sets.