Abstract
We study the static joint chance-constrained lot-sizing problem, in which production decisions over a planning horizon are made before knowing random future demands, and the inventory variables are then determined by the demand realizations. The joint chance constraint imposes a service level requirement that the probability that all demands are met on time be above a threshold. We model uncertain outcomes with a finite set of scenarios and begin by applying existing results about chance-constrained programming to obtain an initial extended mixed-integer programming formulation. We further strengthen this formulation with a new class of valid inequalities that generalizes the classical (\(\ell ,S\)) inequalities for the deterministic uncapacitated lot-sizing problem. In addition, we prove an optimality condition of the solutions under a modified Wagner-Whitin condition, and based on this derive a new extended mixed-integer programming formulation. This formulation is further extended to the case with constant capacities. We conduct a thorough computational study demonstrating the effectiveness of the new valid inequalities and extended formulation.
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Acknowledgements
The authors thank two anonymous referees and the associate editor for helpful comments that led to significant improvements of the paper. Z. Zhang and C. Gao thank the financial support from the National Nature Science Foundation of China under Grant No. 12071428 and 62111530247, and the Zhejiang Provincial Natural Science Foundation of China under Grant No. LZ20A010002.
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Zhang, Z., Gao, C. & Luedtke, J. New valid inequalities and formulations for the static joint Chance-constrained Lot-sizing problem. Math. Program. 199, 639–669 (2023). https://doi.org/10.1007/s10107-022-01847-y
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DOI: https://doi.org/10.1007/s10107-022-01847-y