针对Petri网理论与方法在服务计算中的应用,从Web服务执行的角度,在定义Web服务组合的Petri网的基础上,给出Web服务组合的Petri网的自动生成方法.首先对Web服务的Petri网描述,通过利用Web服务的输入、输出等元素的本体定义为Petri网中...针对Petri网理论与方法在服务计算中的应用,从Web服务执行的角度,在定义Web服务组合的Petri网的基础上,给出Web服务组合的Petri网的自动生成方法.首先对Web服务的Petri网描述,通过利用Web服务的输入、输出等元素的本体定义为Petri网中相应库所元素添加语义标签,得到Web服务的Petri网的PNML(Petri net Markup Language)+OWL(OntologyWeb Language)描述,其中PNML部分描述Petri网的网结构,OWL部分描述Petri网中各库所元素的语义标记;进一步,在已得到Web服务组合中各子Web服务之间输入/输出关联元素的基础上,确定各子Web服务的Petri网之间的可融合库所,通过执行可融合库所之间的库所融合操作,将各子Web服务的Petri网合并得到Web服务组合的Petri网,为Petri网相关理论与方法在服务计算中得到实际应用提供了必要的前提.展开更多
为了更好的支持Web服务组合的Petri网系统的自动生成,提出了在发布Web服务的时候即建立该服务的PNML(Petri Net Markup Language)+OWL(Ontology Web Language)的方法,在建立Web服务领域本体的基础上,通过创建Web服务的Petri网模型,为Pe...为了更好的支持Web服务组合的Petri网系统的自动生成,提出了在发布Web服务的时候即建立该服务的PNML(Petri Net Markup Language)+OWL(Ontology Web Language)的方法,在建立Web服务领域本体的基础上,通过创建Web服务的Petri网模型,为Petri网中库所元素添加相应的语义标记,得到Web服务的类似OWL-S(Ontology Web Language for Services)的服务描述,不仅提高了对Web服务操作语义描述的能力,同时为Web服务组合的Petri网系统的自动生成奠定了基础。展开更多
针对Web服务组合流程的Petri网自动建模问题,以Web服务组合流程为研究对象,采用BPEL4WS作为Web服务组合流程描述语言,设计并实现一个BPEL文件到PNML(Petri Net Markup Language)文件的转换框架,自动实现Web服务组合的Petri网建模。该框...针对Web服务组合流程的Petri网自动建模问题,以Web服务组合流程为研究对象,采用BPEL4WS作为Web服务组合流程描述语言,设计并实现一个BPEL文件到PNML(Petri Net Markup Language)文件的转换框架,自动实现Web服务组合的Petri网建模。该框架利用XSLT实现基于XML的BPEL文件到PNML文件的转换,转换结果导入到支持PNML的Petri网工具,自动完成Petri网建模。结合一个Web服务组合实例,验证该框架的有效性。展开更多
Architecture Analysis and Design Language (AADL) has been utilized to specify and verify nonfunctional properties of Real-Time Embedded Systems (RTES) used in critical application systems. Examples of such critical ap...Architecture Analysis and Design Language (AADL) has been utilized to specify and verify nonfunctional properties of Real-Time Embedded Systems (RTES) used in critical application systems. Examples of such critical application systems include medical devices, nuclear power plants, aerospace, financial, etc. Using AADL, an engineer is enable to analyze the quality of a system. For example, a developer can perform performance analysis such as end-to-end flow analysis to guarantee that system components have the required resources to meet the timing requirements relevant to their communications. The critical issue related to developing and deploying safety critical systems is how to validate the expected level of quality (e.g., safety, performance, security) and functionalities (capabilities) at design level. Currently, the core AADL is extensively applied to analyze and verify quality of RTES embed in the safety critical applications. The notation lacks the formal semantics needed to reason about the logical properties (e.g., deadlock, livelock, etc.) and capabilities of safety critical systems. The objective of this research is to augment AADL with exiting formal semantics and supporting tools in a manner that these properties can be automatically verified. Toward this goal, we exploit Petri Net Markup Language (PNML), which is a standard acting as the intermediate language between different classes of Petri Nets. Using PNML, we interface AADL with different classes of Petri nets, which support different types of tools and reasoning. The justification for using PNML is that the framework provides a context in which interoperability and exchangeability among different models of a system specified by different types of Petri nets is possible. The contributions of our work include a set of mappings and mapping rules between AADL and PNML. To show the feasibility of our approach, a fragment of RT-Embedded system, namely, Cruise Control System has been used.展开更多
目前,工作流模型验证技术已成为工作流技术中重要的研究课题之一.由于工作流逻辑的复杂性,因而如何构建正确的模型是一个较迫切的问题.首先,对现有的验证技术作一个比较分析,根据工作流逻辑在模型中的决定性作用,研究并提出一个基于同步...目前,工作流模型验证技术已成为工作流技术中重要的研究课题之一.由于工作流逻辑的复杂性,因而如何构建正确的模型是一个较迫切的问题.首先,对现有的验证技术作一个比较分析,根据工作流逻辑在模型中的决定性作用,研究并提出一个基于同步网(Syn-net)的模型验证算法,然后给出一个用PNML(Petri Net Markup Language)方式存储的业务实例,并根据化简规则进行化简和优化.最后,实现该验证工具.展开更多
文摘针对Petri网理论与方法在服务计算中的应用,从Web服务执行的角度,在定义Web服务组合的Petri网的基础上,给出Web服务组合的Petri网的自动生成方法.首先对Web服务的Petri网描述,通过利用Web服务的输入、输出等元素的本体定义为Petri网中相应库所元素添加语义标签,得到Web服务的Petri网的PNML(Petri net Markup Language)+OWL(OntologyWeb Language)描述,其中PNML部分描述Petri网的网结构,OWL部分描述Petri网中各库所元素的语义标记;进一步,在已得到Web服务组合中各子Web服务之间输入/输出关联元素的基础上,确定各子Web服务的Petri网之间的可融合库所,通过执行可融合库所之间的库所融合操作,将各子Web服务的Petri网合并得到Web服务组合的Petri网,为Petri网相关理论与方法在服务计算中得到实际应用提供了必要的前提.
文摘为了更好的支持Web服务组合的Petri网系统的自动生成,提出了在发布Web服务的时候即建立该服务的PNML(Petri Net Markup Language)+OWL(Ontology Web Language)的方法,在建立Web服务领域本体的基础上,通过创建Web服务的Petri网模型,为Petri网中库所元素添加相应的语义标记,得到Web服务的类似OWL-S(Ontology Web Language for Services)的服务描述,不仅提高了对Web服务操作语义描述的能力,同时为Web服务组合的Petri网系统的自动生成奠定了基础。
文摘针对Web服务组合流程的Petri网自动建模问题,以Web服务组合流程为研究对象,采用BPEL4WS作为Web服务组合流程描述语言,设计并实现一个BPEL文件到PNML(Petri Net Markup Language)文件的转换框架,自动实现Web服务组合的Petri网建模。该框架利用XSLT实现基于XML的BPEL文件到PNML文件的转换,转换结果导入到支持PNML的Petri网工具,自动完成Petri网建模。结合一个Web服务组合实例,验证该框架的有效性。
文摘Architecture Analysis and Design Language (AADL) has been utilized to specify and verify nonfunctional properties of Real-Time Embedded Systems (RTES) used in critical application systems. Examples of such critical application systems include medical devices, nuclear power plants, aerospace, financial, etc. Using AADL, an engineer is enable to analyze the quality of a system. For example, a developer can perform performance analysis such as end-to-end flow analysis to guarantee that system components have the required resources to meet the timing requirements relevant to their communications. The critical issue related to developing and deploying safety critical systems is how to validate the expected level of quality (e.g., safety, performance, security) and functionalities (capabilities) at design level. Currently, the core AADL is extensively applied to analyze and verify quality of RTES embed in the safety critical applications. The notation lacks the formal semantics needed to reason about the logical properties (e.g., deadlock, livelock, etc.) and capabilities of safety critical systems. The objective of this research is to augment AADL with exiting formal semantics and supporting tools in a manner that these properties can be automatically verified. Toward this goal, we exploit Petri Net Markup Language (PNML), which is a standard acting as the intermediate language between different classes of Petri Nets. Using PNML, we interface AADL with different classes of Petri nets, which support different types of tools and reasoning. The justification for using PNML is that the framework provides a context in which interoperability and exchangeability among different models of a system specified by different types of Petri nets is possible. The contributions of our work include a set of mappings and mapping rules between AADL and PNML. To show the feasibility of our approach, a fragment of RT-Embedded system, namely, Cruise Control System has been used.
文摘目前,工作流模型验证技术已成为工作流技术中重要的研究课题之一.由于工作流逻辑的复杂性,因而如何构建正确的模型是一个较迫切的问题.首先,对现有的验证技术作一个比较分析,根据工作流逻辑在模型中的决定性作用,研究并提出一个基于同步网(Syn-net)的模型验证算法,然后给出一个用PNML(Petri Net Markup Language)方式存储的业务实例,并根据化简规则进行化简和优化.最后,实现该验证工具.
