net theory

This paper introduces a conceptual design Petri net ( CDPN) based on Petri net theory, and applies the model to the analysis of the conceptual design process.

本文应用Petri网对机电产品的概念设计过程进行分析，提出了概念设计网CDPN。

Attempts have been made in this paper to find ways of constructing safety analysis model for UMT operational safety on the basis of Preliminary Hazard Analysis ( PHA) and Petri net theory. A dynamic safety analysis model for the platform screen doors was established.

论文探索了综合应用初步危险分析（PHA）和Petri网理论构建城市轨道交通系统运营安全性分析模型的方法，并对站台屏蔽门建立了动态安全性分析模型；

Secondly, this thesis uses Petri net theory to solve the problem of the schedule plan and control of communication engineering projects, and use the Petri Net to establish module system.

其次，研究了使用Petri网理论解决通信工程项目管理中的计划和控制问题，并使用Petri网建立了模型体系。

One is structural analysis of the network using Petri Net theory and tools.

其一是应用PETRI NET理论和工具对网络结构进行分析。

NET theory and relative technologies and methods, some defects are found, such as immoderately repeated development, lower efficiency of codes and higher workload of module transplant.

NET理论和相关技术，以及在.NET平台下结合分层架构思想开发WEB应用系统的方法，就会发现这种方法也存在着一些问题：重复开发现象严重，代码重用率低，功能模块移植的工作量大等。

The Petri net theory part: Firstly, a new subclass of Petri net named as cascade Petri net, which is the superset of acyclic Petri net, is formally defined.

Petri网理论部分：首先定义了一类名为序状Petri网的全新的Petri网子类，这种Petri网是无环Petri网的超集；