Article
Comparative analysis of group scheduling heuristics in a flow shop cellular system
Introduction
Most research on group scheduling in cellular manufacturing has been studied in an environment that permits early shipments. In reality, many customers now forbid early shipments as part of the implementation of the just-in-time (JIT) approach to manufacturing[1-3]. This study compares the performance of group scheduling heuristics in two types of order shipment environments under the same system domain (e.g. shop model, order/job characteristics, assumptions, etc.). One environment is the permitted early shipment (PES) and the other is the forbidden early shipment (FES). Once an order is completed in the PES environment, it leaves the system without delay. In the FES environment, however, the suppliers must deliver materials to the system on a just-in-time basis; and a completed order cannot leave the system earlier than the customer has specified. The cellular system investigated consists of two flow shop cells; each cell has five workcentres, with the last workcentre shared between cells.
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