信息系统结构可扩展性分析

Expansible Analysis of Structure in Information System Based on the Petri Nets

要素是组成系统的基本单位，任何一个复杂系统的构成，往往涉及到大量的组成要素，如何从这些众多的组成要素中筛选出影响系统功能和性能的关键要素是信息系统分析和设计中的一项重要的工作内容。针对信息系统 Ｐｅｔｒｉ网模型中结点间的相互关系和相互作用，引入了结点耦合强度的概念，在此基础上，给出了系统关键组成要素的定义和确定方法，并定性地提出了信息系统结构调整的方针和原则。

Key elements are basic units of composing system and every complex system is consisted of large numbers of compositions.How to seperate the key elements which effect the functions and properties of system from these compositions is an important work in analysis and design in information system.Based on the Petri nets model of information system,this paper introduces a new concept——node coupling intensity,by which the definition and methd of determining the key composing elements are presented,the policy and principle adjusting the structure of information system are also put forward at the end of this paper.