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A two stage scheduling with transportation and batching. (English) Zbl 1248.68227

Summary: We investigate a two stage scheduling problem with transportation and batching, in which jobs are transported from holding area to the batching machine by m vehicles in the first stage. Each vehicle can transport only one job at a time. As the job is big and heavy in the steel industry, it is reasonable to assume that the vehicle capacity is unit. In the second stage, the batching machine can process up to a fixed number of jobs as a batch simultaneously. Each bath to be processed occurs a processing cost. Our objective is to minimize the makespan and processing cost. For \(m=1\), we present a polynomial time algorithm. For the general problem we prove that it is NP-hard in ordinary sense. Then we provide a pseudo-polynomial time algorithm and obtain a fully polynomial time approximation scheme.

MSC:

68Q17 Computational difficulty of problems (lower bounds, completeness, difficulty of approximation, etc.)
90B06 Transportation, logistics and supply chain management
90B35 Deterministic scheduling theory in operations research
Full Text: DOI

References:

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