In this paper we study the integration of production, transportation and storage decisions in a multi plant-distribution center supply structure. Multiple plants produce one type of item, each of them with different production capacity and costs, and send finished goods to the distribution...

In this paper, we study a special case of the capacitated lot sizing problem (CLSP), where alternative machines are used for the production of a single-item. The production cost on each machine is assumed to be piece-wise linear with discontinuous steps (step-wise costs). The over-produced...

This paper presents a new class of valid inequalities for the single-item capacitated lotsizing problem with step-wise production costs (LS-SW). We first provide a survey of different optimization methods proposed to solve LS-SW. Then, flow cover and flow cover inequalities derived from the...

This paper considers the uncapacitated lot sizing problem with batch delivery, focusing on the general case of time-dependent batch sizes. We study the complexity of the problem, depending on the other cost parameters, namely the setup cost, the fixed cost per batch, the unit procurement cost...

We present a new variant of the standard pooling problem in which demands are fixed and there are specific constraints on the intermediate pool. We propose a new formulation composed of proportion-flow variables, and we design an exact branch and bound algorithm by combining existing algorithms....

To deal with their highly variable workload, logistics companies make their task force flexible using multi-skilled employees, flexible working hours or short-term contracts. Together with the legal constraints and the handling equipments’ capacities, these possibilities make personnel...

A challenge for car manufacturers is to adjust rapidly and efficiently the production capacities with a volatile market demand and despite distant suppliers. In this paper, we consider a sales and operations planning problem based on the actual situation of Renault, a French global automobile...

Defining an efficient bill of materials for a family of complex products is a real challenge for companies, largely because of the diversity they offer to consumers. To remain competitive, their products are available with many variants and options, which leads to a difficult question: "How can...