Multi Product Dynamic Lot-Sizing with Supplier Selection under Quantity Discount and Budget Constraints

摘要

This study's aim is to determine the product purchasing by inventory lot-sizing as a problem of supplier selection with quantity discounts. The objective is to minimize the inventory management costs with the use of mixed integer linear programming. Also, the selection of suppliers with different products will be presented, and the lead-time for suppliers will also be considered, including the conditions of budget. Even so, the results obtained from these tests showed that the determination of the purchasing size and the duration for ordering purchases were correct and were able to be followed through satisfactorily. Finally, this study also tested the efficiency of the determination of lot sizes of purchases by expanding the problem to larger sizes. It was then discovered that the efficiencies in calculations and the results obtained were in good and satisfactory criterions.