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基于SIP协议的VOIP系统设计与实现 被引量:4
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作者 徐炽 张闻芳 《科学技术与工程》 2008年第10期2589-2592,共4页
近年来,SIP作为VoIP的相关协议得到了越来越广泛的应用和越来越多厂商的支持。介绍了VoIP的基本原理及SIP协议的基本内容。基于SIP协议的VoIP作为主要研究内容,探讨了IP电话的相关协议、相关标准和关键技术,对SIP这种比较新的IP电话协... 近年来,SIP作为VoIP的相关协议得到了越来越广泛的应用和越来越多厂商的支持。介绍了VoIP的基本原理及SIP协议的基本内容。基于SIP协议的VoIP作为主要研究内容,探讨了IP电话的相关协议、相关标准和关键技术,对SIP这种比较新的IP电话协议进行了研究分析,设计出一套基于SIP协议的VoIP电话服务器系统,包括系统分析、系统设计、系统实现,最后对该软件进行了测试,使该软件的开发达到了预期的目的。 展开更多
关键词 VOIP SIP RADIUS opensER服务器
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MODELING OF FMS BASED ON UML AND OPNS
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作者 Gao Meimei Wu Zhiming (Department of Automation, Shanghai Jiaotong University) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2000年第2期90-95,共6页
As the main component of computer integrated manufacturing system (CIMS), flexible manufacturing system (FMS) should be an open system with reusability and extenchaility. Moreover, as FMS is a complex asynchronous con... As the main component of computer integrated manufacturing system (CIMS), flexible manufacturing system (FMS) should be an open system with reusability and extenchaility. Moreover, as FMS is a complex asynchronous concurrent system, its model also should have the abilities to express the concurrency in the system and to analyze the behavior of the system. It is difficult to use any one method to model such a complex system as FMS. A modeling method using Object-oriented modeling language-unified modeling language (UML) and object-Oriented Petri nets (OPNs) is proposed. Class diagram in UML is used to represent the static relations among the objects in FMS. OPNs are used to model the dynamic behavior of the objects and conduct performance analysis. OPNs also can be used to identify the attributes and operations of the objects. The model can describe the system integrally and can be used to design FMS control software naturally. 展开更多
关键词 Flexible manufacturing system Modeling Object-oriented model Unified modeling language Object-oriented Pert nets (opens)
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