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In this paper, we study two-period subproblems proposed by Akartunali et al. (2015) for lot-sizing problems with big-bucket capacities and nonzero setup times, complementing our previous work investigating the special case of zero setup times. In particular, we study the polyhedral structure of the mixed integer sets related to various two-period relaxations. We derive several families of valid inequalities and investigate their facet-defining conditions. We also discuss the separation problems associated with these valid inequalities.
|Number of pages||5|
|Publication status||Published - 24 Aug 2015|
|Event||International Workshop on Lot-Sizing - University of Montreal, HEC, Montreal, Canada|
Duration: 24 Aug 2015 → 26 Aug 2015
|Conference||International Workshop on Lot-Sizing|
|Abbreviated title||IWLS 2015|
|Period||24/08/15 → 26/08/15|
- lot-sizing problems
- big-bucket capacities
- nonzero setup times
- polyhedral structure
- two-period relaxations
Akartunali, K., Doostmohammadi, M., & Fragkos, I. (2015). A theoretical study of two-period relaxations for lot-sizing problems with big-bucket capacities. 105-109. Paper presented at International Workshop on Lot-Sizing, Montreal, Canada.