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<p>The authors discuss the modeling of flexible manufacturing systems (FMSs) under uncertainty and evaluate a rule base for online scheduling. To represent uncertain events in an FMS, such as failure of machine tools, repair time, and processing time, they develop continuous-time and discrete-time stochastic Petri nets with hierarchical structures for constructing the FMS model. For obtaining an efficient schedule for the FMS with an online real-time basis, they construct a rule base and evaluate its performance using the FMS simulation system proposed.</p>
flexible manufacturing systems; stochastic Petri nets; uncertainty; rule base; online scheduling; machine tools; repair time; processing time; continuous-time; discrete-time stochastic Petri nets; hierarchical structures; digital simulation; flexible manufacturing systems; knowledge based systems; Petri nets; scheduling

I. Hatono, K. Yamagata and H. Tamura, "Modeling and Online Scheduling of Flexible Manufacturing Systems Using Stochastic Petri Nets," in IEEE Transactions on Software Engineering, vol. 17, no. , pp. 126-132, 1991.
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