In this study, we address a part-type sequencing and tool switching problem arising in Flexible Manufacturing Systems. We consider the single machine problem of minimizing the number of tool switching instants. We propose two tabu search approaches to find high-quality solutions. Our...

In this study, we improved the variable neighborhood search (VNS) algorithm for solving uncapacitated multilevel lot-sizing (MLLS) problems. The improvement is twofold. First, we developed an effective local search method known as the Ancestors Depth-first Traversal Search (ADTS), which can be...

Multilevel lot-sizing (MLLS) problems, which involve complicated product structures with interdependence among the items, play an important role in the material requirement planning (MRP) system of modern manufacturing/assembling lines. In this paper, we present a reduced variable neighborhood...