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- W316224457 abstract "This paper considers a single-machine total weighted completion time scheduling problem with a As the weighted shortest processing time first rule cannot provide an optimal solution, this paper proposes an effective heuristic algorithm to search for a near-optimal solution and compares the performances of both methods with computational experiments. 1. Introduction In traditional machine scheduling problems, job processing times are assumed to be constant for all jobs. However, recent empirical studies in several industries have verified that unit costs decline as firms produce more of a product and gain knowledge or experience. For instance, repeated processing of similar tasks improves worker skills; workers are able to perform setup, to deal with machine operations and software, or to handle raw materials and components at a greater pace (Biskup [1]). This phenomenon is known as the learning effect. Classically, the weighted shortest processing time first (WSPT) rule [8] has been applied to obtain an optimal solution for the total weighted completion time in a single-machine scheduling problem. However, this rule fails to provide an optimal solution when the effect is present. This rule is closely examined and its performance assessed relative to another proposed heuristic algorithm. In previous research concerning scheduling problems on a single machine with considerations, Biskup [1] assumed that a job's processing time is a decreasing function of its position in a sequence, considered two single-machine scheduling problems, and showed that both problems could be solved in polynomial time. Continuing analysis of Biskup's [1] model, Mosheiov [5] pointed out that some problems with a effect are more complex than those in the traditional problem and proposed a counterexample showing that the total weighted completion time problem might not be minimized by the WSPT rule in the context of learning. Lee et al. [4] considered a bi-criterion singlemachine scheduling problem with considerations. In addition, Mosheiov [6] further considered flow time minimization on parallel identical machines. Mosheiov and Sidney [7] extended the setting to allow the in the production process of some jobs to be faster than that of others. Lee and Wu [3] further considered the problem of minimizing total completion time in a two-machine flowshop with a The problem in this study has been mentioned in Mosheiov's work [5] concerning a counterexample, but to my knowledge it has not been further discussed in the literature. The rest of this paper is organized as follows. Background of the scheduling problem is provided and three elimination rules to enhance the efficiency of the search for an optimal solution are proposed in the next section. A heuristic algorithm is proposed in Section 3. Computational results for the performance of the WSPT rule and the proposed heuristic algorithm are presented in Section 4. A conclusion is given in the last section. 2. Background and adjacency properties 3. Heuristic algorithms The WSPT rule schedules jobs in decreasing order of w^sub j^/p^sub j^. This rule is studied with respect to the following proposed algorithm. Heuristic Algorithm (HA): Step 1 : Perform the shortest processing time first (SPT) rule in terms of job processing times, i.e., schedule jobs in decreasing order of p and let S denote the resulting schedule. Set 51 as the initial solution. Step 2: Check adjacent jobs in schedule S from beginning to end: if the condition w^sub j^/p^sub j^ >w^sub j^/p^sub j^ is met, interchange the positions of the two adjacent jobs to create a new sequence. Step 3: Compute the completion time of the new sequence and compare it with the initial solution. If the new one is smaller, replace the initial sequence with the new one. Otherwise, keep the initial one. …" @default.
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- W316224457 date "2006-03-01" @default.
- W316224457 modified "2023-09-24" @default.
- W316224457 title "The Development of a Solution to the Single-Machine Total Weighted Completion Time Problem with a Learning Effect" @default.
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