A novel semantic model of Web service descrip tion and discovery was proposed through an extension for profile model of Web ontology language for services （OWL-S） in this paper. Similarity matching of Web services w...A novel semantic model of Web service descrip tion and discovery was proposed through an extension for profile model of Web ontology language for services （OWL-S） in this paper. Similarity matching of Web services was implemented through computing weighted summation of semantic similarity value based on specific domain ontology and dynamical satisfy extent evaluation for quality of service （QoS）. Experiments show that the provided semantic matching model is efficient.展开更多
Web Services Choreography Description Language lacks a formal system to accurately express the semantics of service behaviors and verify the correctness of a service choreography model.This paper presents a new approa...Web Services Choreography Description Language lacks a formal system to accurately express the semantics of service behaviors and verify the correctness of a service choreography model.This paper presents a new approach of choreography model verification based on Description Logic.A meta model of service choreography is built to provide a conceptual framework to capture the formal syntax and semantics of service choreography.Based on the framework,a set of rules and constraints are defined in Description Logic for choreography model verification.To automate model verification,the UML-based service choreography model will be transformed,by the given algorithms,into the DL-based ontology,and thus the model properties can be verified by reasoning through the ontology with the help of a popular DL reasoned.A case study is given to demonstrate applicability of the method.Furthermore,the work will be compared with other related research.展开更多
Model checking techniques have been widely used in verifying web service compositions to ensure the trustworthi- ness. However, little research has focused on testing web services. Based on the research of model check...Model checking techniques have been widely used in verifying web service compositions to ensure the trustworthi- ness. However, little research has focused on testing web services. Based on the research of model checking techniques~ we propose a model checking based approach for testing web service composition which is described by using the web services choreography description language （WS-CDL）. According to worldwide web consortium （W3C） candidate recommendation, the WS-CDL specification provides a language for characterizing interactions between distinct web services using XML. Since the behaviors of web service composition are asynchronous, distributed, low-coupled and platform independent, we employ the guarded automata （GA） model for specifying the composition described in WS-CDL and using the simple promela interpreter （SPIN） model checker for detecting the collaborations of web services. Test cases can be transformed from counterexamples generated by SPIN using adequacy criteria. In this paper we apply the transition coverage criterion for generating counterex- amples. To illustrate our approach, we set ＂E-commerce service system＂ as an example for demonstrating how test cases can be generated using SPIN for compositions specified in WS-CDL.展开更多
Due to the exploding growth in the number of web services, mashup has emerged as a service composition technique to reuse existing services and create new applications with the least amount of effort. Service recommen...Due to the exploding growth in the number of web services, mashup has emerged as a service composition technique to reuse existing services and create new applications with the least amount of effort. Service recommendation is essential to facilitate mashup developers locating desired component services among a large collection of candidates. However, the majority of existing methods utilize service profiles for content matching, not mashup descriptions. This makes them suffer from vocabulary gap and cold-start problem when recommending components for new mashups. In this paper, we propose a two-step approach to generate high-quality service representation from mashup descriptions. The first step employs a linear discriminant function to assign each term with a component service such that a coarse-grained service representation can be derived. In the second step, a novel probabilistic topic model is proposed to extract relevant terms from coarse-grained service representation. Finally, a score function is designed based on the final high-quality representation to determine recommendations. Experiments on a data set from ProgrammableWeb.com show that the proposed model significantly outperforms state-of-the-art methods.展开更多
基金Supported by Foundation of High Tech Project ofJiangsu (BG2004034)
文摘A novel semantic model of Web service descrip tion and discovery was proposed through an extension for profile model of Web ontology language for services （OWL-S） in this paper. Similarity matching of Web services was implemented through computing weighted summation of semantic similarity value based on specific domain ontology and dynamical satisfy extent evaluation for quality of service （QoS）. Experiments show that the provided semantic matching model is efficient.
基金This work is supported by the National Natural Science Fund number 61802428.
文摘Web Services Choreography Description Language lacks a formal system to accurately express the semantics of service behaviors and verify the correctness of a service choreography model.This paper presents a new approach of choreography model verification based on Description Logic.A meta model of service choreography is built to provide a conceptual framework to capture the formal syntax and semantics of service choreography.Based on the framework,a set of rules and constraints are defined in Description Logic for choreography model verification.To automate model verification,the UML-based service choreography model will be transformed,by the given algorithms,into the DL-based ontology,and thus the model properties can be verified by reasoning through the ontology with the help of a popular DL reasoned.A case study is given to demonstrate applicability of the method.Furthermore,the work will be compared with other related research.
基金Project supported by the Open Foundation of State Key Laboratory of Software Engineering(Grant No.SKLSE20080712)the National Natural Science Foundation of China(Grant No.60970007)+2 种基金the National Basic Research Program of China(Grant No.2007CB310800)the Shanghai Leading Academic Discipline Project(Grant No.J50103)the Science and Technology Commission of Shanghai Municipality(Grant No.09DZ2272600)
文摘Model checking techniques have been widely used in verifying web service compositions to ensure the trustworthi- ness. However, little research has focused on testing web services. Based on the research of model checking techniques~ we propose a model checking based approach for testing web service composition which is described by using the web services choreography description language （WS-CDL）. According to worldwide web consortium （W3C） candidate recommendation, the WS-CDL specification provides a language for characterizing interactions between distinct web services using XML. Since the behaviors of web service composition are asynchronous, distributed, low-coupled and platform independent, we employ the guarded automata （GA） model for specifying the composition described in WS-CDL and using the simple promela interpreter （SPIN） model checker for detecting the collaborations of web services. Test cases can be transformed from counterexamples generated by SPIN using adequacy criteria. In this paper we apply the transition coverage criterion for generating counterex- amples. To illustrate our approach, we set ＂E-commerce service system＂ as an example for demonstrating how test cases can be generated using SPIN for compositions specified in WS-CDL.
基金supported in part by the National Natural Science Foundation of China(No.61673230)
文摘Due to the exploding growth in the number of web services, mashup has emerged as a service composition technique to reuse existing services and create new applications with the least amount of effort. Service recommendation is essential to facilitate mashup developers locating desired component services among a large collection of candidates. However, the majority of existing methods utilize service profiles for content matching, not mashup descriptions. This makes them suffer from vocabulary gap and cold-start problem when recommending components for new mashups. In this paper, we propose a two-step approach to generate high-quality service representation from mashup descriptions. The first step employs a linear discriminant function to assign each term with a component service such that a coarse-grained service representation can be derived. In the second step, a novel probabilistic topic model is proposed to extract relevant terms from coarse-grained service representation. Finally, a score function is designed based on the final high-quality representation to determine recommendations. Experiments on a data set from ProgrammableWeb.com show that the proposed model significantly outperforms state-of-the-art methods.
基金Supposed by the National Natural Science Foundation of China under Grant Nos.6053406060473094(国家自然科学基金)+3 种基金the National High-Tech Research and Development Plan of China under Grant No.2007AA01Z136(国家高技术研究发展计划(863))the National Basic Research Program of China under Grant No.2003CB317002(国家重点基础研究发展计划(973))the 2006 Mountaineering Program ofShanghaiChina under Grant No.06JC14065(上海市科委2006年度"登山行动计划")
文摘在对当前面向服务体系架构(service-oriented architecture,简称SOA)研究的基础上,给出了一个以企业服务总线(enterprise service bus,简称ESB)为中心的面向服务软件体系架构参考模型(SOA reference model,简称SOARM),是集Petri网和时序逻辑于一体的形式化SOA分析、验证和确认方法.基于以客户为中心的面向服务架构设计理念,即根据用户提出系统规范/需求,服务提供者提供服务或组合服务来满足服务消费者,服务接口和ESB作为实现面向服务架构的关键部分.虚拟计算环境下,服务语义的一致性验证是十分必要的,SOARM采用新的模式:通过Petri网为服务的行为建模,时序逻辑来描述服务语义一致性约束,综合运用分而治之的精炼检测思想和SOA模型检测合成方法,通过对这些子服务性质的检验来验证整个系统的规范.用商业银行综合前置系统说明了如何使用这种方法来实现面向服务的设计.
