On some properties of optimal schedules in the job shop problem with preemption and an arbitrary regular criterion

S. Sevastyanov (), D. Chemisova and I. Chernykh ()

Annals of Operations Research, 2014, vol. 213, issue 1, 253-270

Abstract: Optimal schedules in the job shop problem with preemption and with the objective of minimizing an arbitrary regular function of operation completion times are studied. It is shown that for any instance of the problem there always exists an optimal schedule that meets several remarkable properties. Firstly, each changeover date coincides with the completion time of some operation, and so, the number of changeover dates is not greater than the total number of operations, while the total number of interruptions of the operations is no more than the number of operations minus the number of jobs. Secondly, every changeover date is “super-integral”, which means that it is equal to the total processing time of some subset of operations. And thirdly, the optimal schedule with these properties can be found by a simple greedy algorithm under properly defined priorities of operations on machines. It is also shown that for any instance of the job shop problem with preemption allowed there exists a finite set of its feasible schedules which contains at least one optimal schedule for any regular objective function (from the continuum set of regular functions). Copyright Springer Science+Business Media New York 2014

Keywords: Job shop; Preemption; Regular criterion; Optimal schedule; Greedy algorithm (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1007/s10479-012-1290-3

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