模糊时间Petri网及扩展的模糊时间Petri网

网络实时系统对时间和QoS有严格要求，因此对设计、实现和测试的技术和工具都有很高的要求。模糊时间Petri网是将模糊集合理论用于不确定的或主观的时间信息的表示，在每个变迁上添加时间间隔约束对模糊时间Petri网进行扩展得到扩展的模糊时间Petri网，它是一种对网络实时系统进行建模和分析的形式化模型，Petri网数学理论基础能保证并发系统的可靠性和正确性。本文详细地介绍了模糊时间Petri网及可扩展的时间Petri网，可扩展的时间Petri网的网精简方法，使用design／CPN仿真，及使用EFTN对多媒体同步建模，并探讨了进一步研究的方向。

Fuzzy-Timing Petri Nets and Extended Fuzzy-Timing Petri Nets

Network-based real-time system has strict requirements for time and QoS, therefore techniques and tools helping engineers design, implement and test these applications are highly desirable. Fuzzy-Timing Petri Net (FTN) employ fuzzy set theory to express uncertain or subjective timing information, by each transition being associated with a firing interval, we get Extended Fuzzy-Timing Petri Net(EFTN). Extended Fuzzy-Timing Petri Net(EFTN)is a for- mal model for modeling and analysis of network-based real-time systems, Petri Net's mathematical theory basis will en- sure the reliability and correctness of concurrent systems. This paper detailedly introduces the definition of FTN and EFTN, model check method, net-reduction technology, using design/CPN to simulate, modeling distributed multime- dia synchronization by EFTN, and gives some directions of future work.