语义网服务中的本体综述

作为实现下一代Web的集成方案,语义网服务将语义Web技术和Web服务技术相结合,以支持Web服务的自动发现、选择、合成和执行.本体是语义网服务的理论基础.介绍了Web资源描述本体OWL和Web服务描述本体的概况,并对3种主流的Web服务语义描述框架进行对比分析,为语义网服务中本体的创建提供基础知识.研究了语义网服务中存在的各层次的本体异构问题,明确了语义网服务中本体集成的主要研究方向.     

基于过滤级的语义Web服务发现策略

语义Web与Web services有很强的互补性,在现有技术条件下二者的统一构建了新一代Web服务--语义Web服务.描述了语义Web服务发现的任务,提出了一种基于过滤级的发现策略,最后给出了各级匹配的具体算法.基于过滤级的语义Web服务发现策略明显地缩减了服务匹配的空间,并大大提高了服务发现的时间效率.同时,相关技术还在进一步的研究中.     

一种基于语义Web环境的电子商务模型

语义Web不仅能为人类用户而且能为软件Agent提供从语法层次到语义层次上的互操作性。语义Web与Web-Services有很强的互补性,现有的技术条件使二者的统一成为一种可能,这给电子商务的发展带来了一次历史性的革命机遇。给出了语义Web环境下结合Web Services关键技术和智能主体技术的一种极具潜能的电子商务实现模型。     

Extensible soft semantic web services agent

Web services technology is critical for the success of business integration and other application fields such as bioinformatics. However, there are two challenges facing the practicality of Web services: (a) efficient location of the Web service registries that contain the requested Web services and (b) efficient retrieval of the requested services from these registries with high quality of service (QoS). The main reason for this problem is that current Web services technology is not semantic-oriented. Several proposals have been made to add semantics to Web services to facilitate discovery and composition of relevant Web services. Such proposals are being referred to as semantic Web services (SWS). However, most of these proposals do not address the second problem of retrieval of web services with high QoS. In this paper, we propose a framework called soft semantic Web services agent (soft SWS agent) for providing high QoS Semantic Web services using soft computing methodology. Since different application domains have different requirement for QoS, it is impractical to use classical mathematical modeling methods to evaluate the QoS of semantic Web services. We use fuzzy neural networks with Genetic Algorithms (GA) as our study case. Simulation results show that the soft computing methodology is practicable to handle fuzzy and uncertain QoS metrics effectively.     

基于证书的语义Web服务访问控制方法

为了实现语义Web服务环境中的访问控制机制,研究了基于证书授权的访问控制方法.在对语义Web服务的访问控制需求进行分析的基础上,提出了将简单公钥基础设施/简单分布式安全基础设施(SPKI/SDSI)证书与OWL-S本体描述集成的访问控制方法,该方法将访问控制描述与服务功能描述集成在一个统一的框架中,既便于管理又提高了用户访问Web服务的效率.     

Frame Logic-based specification and discovery of semantic web services with application to medical appointments

Matching web services and client requirements in the form of goals is a significant challenge in the discovery of semantic web services. The most common but unsatisfactory approach to matching is set-based, where both the client and web services declare what objects they require and what objects they can provide. Matching then becomes the simple task of comparing sets of objects. This approach is inadequate because it says nothing about the functionality required by the client or the functionality provided by the web service. As an alternative, we use the Frame Logic as implemented in Flora-2 to specify web service capabilities and client requirements, including their preconditions, postconditions, and ontologies, implement a logic-based discovery agent using Flora-2, demonstrate its usefulness in a medical appointment making scenario, and show its efficiency both theoretically and by benchmarking. The result is an expressive yet concise representation scheme for semantic web services, and a practical, efficient, powerful, and fully implemented matching engine based purely on logical inference for web service discovery, with direct applicability to Web Service Modeling Ontology and Web Service Modeling Language, because both are based on Frame Logic.     

基于扩展语义接口的Web服务动态组合方法

自动地根据用户请求进行服务的动态组合是目前Web服务领域的关键问题.针对该问题,提出了一种基于本体的服 务动态组合方法,设计并实现了一个服务动态组合原型.首先Web服务按照一定规则被抽象为本体模型,然后通过分析所 构造服务的模型来实现服务的匹配,最后利用BPEL4ws对匹配生成的服务组合序列来进行自动的组合.实验结果表明,该 方法细化了服务接口的语义,并且在发现结果上有更高的准确性.     

轻量级语义Web服务发现模型的研究

针对现有多数语义Web服务发现方法应用实施难度大,对终端用户输入信息的完整性依赖度高的问题,提出一种基于简单查询语句的轻量级语义Web服务发现模型。该模型提供给用户一个类似Google的查询界面,输入查询语句后经过领域本体匹配、基于WordNet同义词典匹配等步骤自动发现并调用相应的Web操作。另外,还利用自学机制不断扩充本体词汇以提高系统的准确率和召回率。详细分析了该模型的系统性能,并深入研究了不同情况下准确率和召回率的变化。实验结果表明,本体匹配技术及自学机制的使用是系统准确率和召回率提高的关键。     

基于Agent的Web Services自适应工作流模型的研究

如何让企业可以灵敏反应外部环境的变动并快速改变企业内部的流程作业,是传统工作流管理系统面临的最大挑战.提出一种基于Agent的Web Services工作流模型(AW-WFM)来解决这个难题.在这个模型中,基于Agent的技术实现一种工作流协作机制,而Web Services技术为工作流管理系统提供了计算资源.最后,介绍了AW-WFM在上海大学协同办公系统中的应用.     

WESONet: Applying semantic web technologies and collaborative tagging to multimedia web information systems

The publication of different media types, like images, audio and video in the World Wide Web is getting more importance each day. However, searching and locating content in multimedia sites is challenging. In this paper, we propose a platform for the development of multimedia web information systems. Our approach is based on the combination between semantic web technologies and collaborative tagging. Producers can add meta-data to multimedia content associating it with different domain-specific ontologies. At the same time, users can tag the content in a collaborative way. The proposed system uses a search engine that combines both kinds of meta-data to locate the desired content. It will also provide browsing capabilities through the ontology concepts and the developed tags.     

基于语义的Web服务发现算法优化

服务发现的精确度和对服务请求者的响应速度随着发布的Web服务的数量增多显得日益重要.确保服务发现精度的同时,提出一种改进服务匹配的算法即服务发现提前匹配算法,通过有效地利用已计算出来的匹配程度的信息以减少匹配操作,缩短对请求者的响应时间.为了能及时地更新和删除过时的服务,通过改进相应的数据存储结构,提出了一种维护服务的算法,并进行了相关的理论和实验上的性能分析.实验结果表明算法在很大程度上缩短了对服务请求的响应时间.     

语义Web环境下的信息检索机制研究

人们借助搜索引擎在网络资源中查找所需信息,但搜索引擎本身并不理解要检索内容的真正含义,只是严格的按照关键词进行匹配.语义Web的目标是实现网络资源的机器理解,成为近年来一个新的研究热点.将Agent思想应用到语义Web中,提出了语义Web环境下的信息检索模型,介绍了模型中每个组成部分的功能.然后以图书信息检索为应用背景,将提出的信息检索模型进行了应用.结果表明,信息检索的查准率和查全率都有了较好的改善.     

基于OWL-S的Web服务匹配模型设计

随着Web服务的大量涌现,如何正确定位合适的Web服务成为主要问题.UDDI上基于关键词和简单分类的服务发现机制已经不能很好的满足需要.为此,提出了一种新的基于OWL-S的匹配模型,同时引入相似函数来分类服务.方法提供了新的方式来发现和利用已发布的Web服务,其灵活性和可扩展性能够实现复杂的Web服务请求.     

Web服务安全性的研究与实现

研究了Web服务的安全性,介绍了Web服务的安全性需求,分析了现有安全技术保护Web服务存在的缺点和不足,在此基础上引出了WS-Security规范,并对此规范进行阐述,进而提出了一个Web服务安全性的实现方案,使用WS-Security和其它配合工具在SOAP消息中嵌入安全机制,以解决WS-Security所涉及的3个方面问题,即身份验证、签名、加密.最后使用WSE进行了实现.     

基于Web服务的EAI在银行业的应用

针对当前银行业信息化现状和数据大集中的难题,提出了以Web服务为核心技术,综合运用数据交换中心、智能代理、Java Agent等计算机技术的企业应用集成解决方案,结合湖南某商业银行的应用案例详细描述了该方案的技术实现。     

A systematic review on the functional testing of semantic web services

Semantic web services are gaining more attention as an important element of the emerging semantic web. Therefore, testing semantic web services is becoming a key concern as an essential quality assurance measure. The objective of this systematic literature review is to summarize the current state of the art of functional testing of semantic web services by providing answers to a set of research questions. The review follows a predefined procedure that involves automatically searching 5 well-known digital libraries. After applying the selection criteria to the results, a total of 34 studies were identified as relevant. Required information was extracted from the studies and summarized. Our systematic literature review identified some approaches available for deriving test cases from the specifications of semantic web services. However, many of the approaches are either not validated or the validation done lacks credibility. We believe that a substantial amount of work remains to be done to improve the current state of research in the area of testing semantic web services.