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The Computer Journal 2003 46(5):505-523; doi:10.1093/comjnl/46.5.505
© 2003 by British Computer Society
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Extended Synchronized Choice Nets

Daniel Yuh Chao1,2

1 Department of Management and Information Science, National Cheng Chi University, Taipei, Taiwan, Republic of China Email: yaw@mis.nccu.edu.tw 2 The former name of the author is Yuh Yaw, which appeared in some of his earlier papers.

Unlike traditional classification by output conditions of places, synchronized choice nets (SNCs) were defined as a new class of nets where all first-order structures (FOSs) are symmetric. SNCs are extended to deal with nets with asymmetric first-order structures (AFOSs). A subclass called extended SNCs (ESNCs) can be converted to a general Petri net, called a weighted SNC (WSNC). A WSNC is an SNC if all its arc weights are one. We apply existing theory to check if a WSNC is structural live and bounded. If it is, we derive the sufficient and necessary marking condition (the weighted marking $W(M_0)>0$) for liveness. Thus, it is live when invariant-controlled. We then enhance it in three aspects and apply it to flexible manufacturing systems with resource sharing. Extensions to ESNCs are also discussed.


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