Scalability and Implementation Issues for Discrete-Event Systems

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The primary objective of this proposal is to address the two main concerns standing in the way of the adoption of DES theory by industry: scalability and implementation issues. In discrete-event systems (DES), a great deal of effort is currently being applied to overcome the state space combinatorial explosion problem, in order to allow supervisory control methods to scale to large systems (> 10^20 states). To deal with the complexity of large scale systems, the software engineering community has long advocated the decomposition of software into modules (components) that interact via well defined interfaces. The applicant has developed a similar approach, called hierarchical interface-based hierarchical supervisory control (HISC). This approach develops well defined interfaces between components to provide the structure to allow local checks to guarantee global properties such as controllability or nonblocking.