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1 2014

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Batch scheduling in a two-stage flexible flow shop problem

Gerstl E., Mosheiov G., Sarig A.

Foundations of Computing and Decision Sciences

2014

Vol. 39, No. 1

3--16

We study a special two-stage flexible flowshop, which consists of several parallel identical machines in the first stage and a single machine in the second stage. We assume identical jobs, and the option of batching, with a required setup time prior to the processing of a new batch. We also consider the option to use only a subset of the available machines. The objective is minimum makespan. A unique optimal solution is introduced, containing the optimal number of machines to be used, the sequence of batch sizes, and the batch schedule. The running time of our proposed solution algorithm is independent of the number of jobs, and linear in the number of machines.