Abstract
Production and inventory planning have become crucial and challenging in nowadays competitive industrial and commercial sectors, especially when multiple plants or warehouses are involved. In this context, this paper addresses the complexity of uncapacitated multi-plant lot-sizing problems. We consider a multi-item uncapacitated multi-plant lot-sizing problem with fixed transfer costs and show that two of its very restricted special cases are already NP-hard. Namely, we show that the single-item uncapacitated multi-plant lot-sizing problem with a single period and the multi-item uncapacitated two-plant lot-sizing problem with fixed transfer costs are NP-hard. Furthermore, as a direct implication of the proven results, we also show that a two-echelon multi-item lot-sizing with joint setup costs on transportation is NP-hard.
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Acknowledgements
The authors are thankful to two anonymous reviewers for their comments which helped improving the quality of this paper. Work of Rafael A. Melo was supported by the State of Bahia Research Foundation (FAPESB); and the Brazilian National Council for Scientific and Technological Development (CNPq).
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Cunha, J.O., Kramer, H.H. & Melo, R.A. On the computational complexity of uncapacitated multi-plant lot-sizing problems. Optim Lett 15, 803–812 (2021). https://doi.org/10.1007/s11590-020-01615-x
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DOI: https://doi.org/10.1007/s11590-020-01615-x