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In the paper, a similarity based ant-colony algorithm (SACO) is proposed for the permutation flowshop scheduling problems with total flowtime minimization, which is known as NP-hard. By applying the space mapping method which is testified to be reasonable, it is proved theoretically that the deposit factor rho has hardly impact on the ACO evolutionary availability, and rho = 0.5 is reasonable for...
No-wait flowshops with flowtime minimization are typical NP-complete combinatorial optimization problems, widely existing in practical manufacturing systems. Different from traditional methods by which objective of a new schedule being completely computed objective increment methods are presented in this paper by which the objective of an offspring being obtained just by objective increments and computational...
In this paper, NP-hard no-wait flowshop scheduling problems with makespan minimization are considered. An iterative local search method is proposed which performs a randomized walk in the space of local optima until some stop criterion is satisfied. A perturbation mechanism and a compound neighborhood operator (or move ) are presented. The proposal is compared with the best algorithm so far. Experimental...
In this paper, a composite heuristic algorithm is proposed for permutation flowshop scheduling problems (PFSP) with total flowtime minimization, which are well known NP-hard. Besides initialized by LR(n/m), solution of the proposal is developed by iteration of FPE or BPE alternatively. Perturbation is applied to escape from the local optimization when no improvement can be obtained during the development...
In this paper, a Web Service based method is presented to conduct parallelized operations in an algorithm on multiple computers. Parallelizable operations in a constructive heuristic for flow shop scheduling problem with total flowtime minimization are analyzed. A parallel heuristic for the problem is described and its parameters are analyzed in theory. The proposed parallel heuristic is compared...
In this paper, no-wait flow shop scheduling problem with total flowtime minimization is considered. A hybrid heuristic is proposed, which is based on PHI (p) (presented by Aldowaisan and Allahverdi, OMEGA, 2004). A composite algorithm is adopted to generate the initial seed. Job insertion in PHI (p) is replaced with an existing constructive heuristic. Experimental results show that the proposal outperforms...
In this paper, permutation flow shop scheduling problem with total flowtime minimization is considered. Two composite heuristics, CH1 and CH2, are proposed which use LR (developed by Liu & Reeves) as index development phase and iterative RZ+FPE-R procedure as solution improvement phase. CH2 also adopts FL to construct a solution. CH1 and CH2 are compared with FLR1, FLR2 and IH7_FL (the best existing...
In this paper, an objective increment method is introduced for no-wait flow shops with makespan minimization, which can calculate makespan of a new schedule directly from that of its parent and can judge whether the new schedule is better than its parent or not. Specific makespan increments are analyzed for insertion and pair-wise exchange, two fundamental operations in most heuristics for flow shops...
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