A MULTI-ITEM BI-LEVEL PRODUCTION PLANNING PROBLEM WITH REUSABLE BY-PRODUCTS

In this paper, we investigate a multi-item production planning problem in which reusable by-products are generated during the production. After further processing, the generated by-products can be reused as raw materials. However, by-products may be "recycled" only a given number of times. The production and recycling processes may be performed in internal and external sites with limited capacity. Each product may be produced using specific raw material -newly purchased or recycled- references. The discussed model represents a part of the supply chain of "SOI" (Silicon-On-Insulator) fabrication units. Using demonstrative examples based on industrial data, the model is validated and its characteristics are discussed. Finally, some interesting perspectives of the model are proposed.

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