优先权输入对象组成Petri网及其在分布式多媒体通信中的应用  

Research on the Petri net composed of priority input object and its application in distributed multimedia communication

作　　者：廖锋峰[1,2] 苏娜[2] 郭行波[1] 

机构地区：[1]浙江工业大学软件学院,浙江杭州310032 [2]山东科技大学信息科学与工程学院,山东青岛266510

出　　处：《浙江工业大学学报》2009年第1期91-95,共5页Journal of Zhejiang University of Technology

摘　　要：提出一种对传统Petri网的新的扩展模型PIP-net,该模型将优先权概念引入到变迁的输入弧中,并定义了其高优先权输入弧在到达某特定变迁后,会在设定的时间间隔过后发射该变迁,而并不等待低优先权或非优先权输入弧到达的发射规则.之后提出基于OCPN以及XOCPN进行扩展的POCPN模型.除了加入PIP-net的特性外,POCPN模型还定义了变迁上的阻塞时间值以及发射条件阈值.该模型可以被用来为分布式多媒体系统设计控制装置,为系统处理同步和用户交互.In this paper, a PIP-net model which is an extension from the traditional Petri nets is proposed. The priority is introduced into the transition input arcs in this PIP-net model. The launching rules of transition in this model are defined. It is that a transition will be launched at the time interval when the higher priority input arc reaches a specific transition without waiting for the arrival of the lower priority input arcs or non-priority input arcs. The POCPN model with the attributes of the PIP-net in is proposed based on the OCPN model and XOCPN model. In POCPN model, the block-time value and launching-condition threshold of transition are defined. This model can be used to design the control equipment in the distributed multimedia systems, deal with the synchronization and user interaction.

关 键 词：PETRI网 分布式多媒体系统 通信 同步 优先权 用户交互 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]