Refined conditions for V-shaped optimal sequencing on a single machine to minimize total completion time under combined effects

Alan J. Soper () and Vitaly A. Strusevich ()
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Alan J. Soper: University of Greenwich
Vitaly A. Strusevich: University of Greenwich

Journal of Scheduling, 2020, vol. 23, issue 6, No 5, 665-680

Abstract: Abstract We address single-machine scheduling problems for which the actual processing times of jobs are subject to various effects, including a positional effect, a cumulative effect and their combination. We review the known results on the problems to minimize the makespan, the sum of the completion times and their combinations and identify the problems for which an optimal sequence cannot be found by simple priority rules such as Shortest Processing Time (SPT) and/or Longest Processing Time (LPT). Typically, these are problems to minimize the sum of the completion times under a deterioration effect, and we verify under which conditions for these problems an optimal permutation is V-shaped (an LPT subsequence followed by an SPT subsequence). We demonstrate that previously used techniques for proving that an optimal sequence is V-shaped are not properly justified. We use the corrected method to describe a wide range of problems with a pure positional effect and a combination of a cumulative effect with a positional effect for which an optimal sequence is V-shaped. On the other hand, we show that even the refined approach has its limitations.

Keywords: Scheduling; Single machine; Positional effect; Cumulative effect; Total completion time; V-shaped (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (1)

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DOI: 10.1007/s10951-019-00628-4

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