Paper:
Language: English:

Fuzzy Flexible-Flow Shops at Two Machine Centers

Tzung-Pei Hong^* and Wei-Chou Chen^**

*Department of Information Management
**Institute of Information Engineering, I-Shou University Kaohsiung, 84008, Taiwan, R.O.C.

Received: May 6, 1998

Accepted: August 19, 1998

Keywords: Scheduling, Flexible-flow shop, Fuzzy set, Membership function, LPT, Johnson algorithm

Journal ref: Journal of Advanced Computational Intelligence and Intelligent Informatics, Vol.2, No.4 pp. 142-149, 1998

Abstract

In simple-flow shop problems, each machine operation center has one machine. If a machine center has more than one machine, scheduling becomes a flexible shop flow problem. Flexible shop flows are thus generalizations of simple shop flow. Processing time for each job was previously assumed to be known exactly, but in many real-world applications, processing times vary dynamically due to human or operating factors. We apply fuzzy concepts to represent uncertainty in processing times for flexible-flow shops with two machine centers, then propose a fuzzy heuristic algorithm for job scheduling. We first use a fuzzy LPT algorithm to allocate jobs, then use a fuzzy Johnson algorithm to deal with task sequencing. The proposed method lets jobs be scheduled more flexibly than conventionally.

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