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- W2120699424 abstract "In this report we review recent work on the stability of scheduling policies in manufacturing systems, and present some extensions of this work. Flexible manufacturing systems are modeled as queueing networks, and issues of stability considered for a wide range of scheduling policies. These scheduling policies are distributed and may be implemented in real-time. The tradeoff between machine set-up time and stability is examined in detail for single machine systems, and it is shown that a large class of policies, called Cleara-Generalized Fraction, is stable. Next, stable idling policies are found to minimize average buffer levels in certain lightly loaded systems. The decision to idle is found to be independent of the set-up times (when all of the set-up times are identical). A lower bound on the average buffer level of any stable policy is presented and discussed. Candidates for good scheduling policies on single machine systems are examined. Next, networks of machines are considered, and the starvation or under-utilization of machines is identified as an important cause of instability. This is illustrated by examples of simple systems. It is found that a way to cope with this phenomenon is to follow a buffer priority scheduling scheme, with the buffers ordered in relation to the flow line. Under reasonable assumptions, due date based polices are found to behave much like the buffer priority scheme, Last Buffer First Served. This assures their stability as well. We find that a number of stable policies are limited overtakingpolicies for which a contractive delay estimate property holds." @default.
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- W2120699424 date "1990-01-01" @default.
- W2120699424 modified "2023-09-27" @default.
- W2120699424 title "Stability of Real-Time Scheduling Policies In Flexible Manufacturing Systems" @default.
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