Efficient upper and lower bounding methods for flowshop sequence-dependent group scheduling problems
by Taha Keshavarz; Nasser Salmasi
European J. of Industrial Engineering (EJIE), Vol. 8, No. 3, 2014

Abstract: In this research, a permutation flowshop sequence-dependent group scheduling problem with minimisation of total completion time is considered. Since the problem is shown to be strongly NP-hard, a hybrid genetic (HG) algorithm is proposed. The only available lower bounding (LB) method for the proposed research problem in the literature based on branch and price (B&P) algorithm is also enhanced by proposing efficient method to solve sub-problems and proposing a better branching rule. A statistical comparison shows that both the proposed HG algorithm and the proposed LB have better performance than the other methods from the literature with an average 5.96% percentage gap. [Received 13 December 2011; Revised 24 May 2012; Revised 15 November 2012; Accepted 16 November 2012]

Online publication date: Sat, 28-Jun-2014

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