Operations Research Transactions ›› 2020, Vol. 24 ›› Issue (2): 42-60.doi: 10.15960/j.cnki.issn.1007-6093.2020.02.004

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Optimal algorithms for hybrid flow shop schedule on two machines with learning effect

ZHAO Congcong, FANG Dandan, LI Rongheng*   

  1. Key Laboratory of High Performance Computing and Stochastic Information Processing, School of Mathematics Statistics, Hunan Normal University, Changsha 410081, China
  • Received:2020-01-11 Published:2020-06-13

Abstract: In this paper, optimal algorithms are proposed for hybrid flow shop schedule of identical jobs on two machines (named as M1 and M2) with learning effect. In our problem, each job has two tasks, named as task A and task B respectively, and two optional processing modes. The task B can start to be processed only if after task A has been finished. The first processing mode, named as mode 1, is to assign both task A and B to machine M2. The second processing mode, named mode 2, is to assign task A and B to machine M1 and M2, respectively. It is assumed that each machine has learning effect when processing the job, in other words, the actual processing time of the job is related to the processing position of the job. Our objective is to minimize the makespan. Optimal algorithms are given for two systems with no buffer and infinite buffer respectively.

Key words: hybrid flow shop, learning effect, optimal algorithm, makespan

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