• Title, Summary, Keyword: synchronic time ratio

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Initial requirements to the optimal performance of systems modeled by timed place Petri nets using the synchronic time ratio (Synchronic time ratio를 이용 시간 페트리 네트로 모델링된 시스템의 최적 성능에 필요한 초기 조건 결정)

  • Go, In-Seon;Choi, Juang-Hwan
    • Journal of Institute of Control, Robotics and Systems
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    • v.3 no.1
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    • pp.101-108
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    • 1997
  • The initial token value required to the optimal performance of discrete event systems can be decided by Sum of Delay Time and Synchronic Time ratio, which are new synchronic variables in Timed Place Petri Nets. For the system consisting of two Live-and-Bounded circuits(LB-circuits) fused in common Transition-Transition-Path or common Place-Place-Path, we prove that the Synchronic Time Ratio is the initial token ratio between two LB-circuits to optimally perform system functions. These results are generalized and formulated as a theorem. The initial tokens of a specific place can imply shared resources. Using the theorem, we can decide the minimum number of the shared resources to obtain the optimal performance, and minimize the idling time of resources. As an example, an automated assembly system is modeled by Timed Place Petri Net, and the initial tokens to achieve the optimal system performance are identified. All the values are verified by simulation.

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