Review of SDG modeling and its application
Review of SDG modeling and its application
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发表时间：
2005
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通讯作者：
X. De-yun
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作者：
X. De-yun
符号有向图（SDG）是描述大规模复杂系统的一种有效方法，它可以用节点和有向分支来表示系统变量及其因果关系，近年来，SDG的研究已成为一个热点，并取得了许多成果，特别是在危险或安全分析领域。本文在回顾SDG方法产生的背景和最新进展的基础上，对SDG方法进行了综述，首先，介绍了可持续发展目标的数学描述和三种建模方法，（基于数学模型、流程图和经验），然后介绍了危险评价和故障诊断的主要研究成果和应用，并讨论了几种方法的优点和局限性，其中关键问题是推理方法及其效率，最后指出了SDG的发展前景，指出在定量信息的引入、推理方法和建模自动化等方面还需要深入研究。
Signed directed graph(SDG) is an effective description of large-scale complex systems,which can express system variables and their cause-effect relations by nodes and directed branches.In recent years,the research on SDG has been a focus and obtained a lot of achievements,especially in the area of hazard or safety analysis.After reviewing the background and up-to-date developments of SDG approach,a summary is given,including some major problems in SDG study.Firstly,mathematical formulation and three kinds of modeling approaches of SDG(based on mathematical model,flow chart and experiences) are introduced.Then,the main results of the research and applications in hazard assessment and fault diagnosis are presented,and the advantages and limits of several methods are discussed,in which the key problem is inference methods and their efficiency.Finally,the prospects of SDG are proposed that many aspects should be researched in depth such as introduction of quantitative information,the inference method and modeling automatically.