面向OWS地理信息服务的描述词汇约简模型研究

地理信息服务在发展进程中缺乏对服务信息的语义描述,处于数据丰富而知识缺乏的境地,要充分利用大量的已有数据信息,则必须对数据做一些精化处理,就迫切需要一种从大数据量中发现、提取知识的有效方法。该研究以OGC网络服务（OGC Web Service,OWS）为研究对象,基于OWS服务的XML文档和描述词汇,对搜集到的OWS服务进行解析,并引入粗糙集理论的约简方法,建立面向OWS服务的描述词汇约简模型,从而对解析后的OWS服务进行约简,最终形成OWS服务最优描述词汇集,为后续OWS语义推理奠定基础。     

Interactive information services using World-Wide Web hypertext

Most World-Wide Web information servers provide simple browsing access to collections of static text or hypertext files. This paper describes some interactive World-Wide Web servers that produce information displays and documents dynamically rather than just providing access to static files. The PARC Map Viewer uses a geographic database to create and display maps of any part of the world on demand. The Digital Tradition folk music server provides access to a large database of song lyrics and melodies. These applications take advantage of the multimedia capabilities of World-Wide Web to deliver graphical and audio content as well as formatted text. Hypertext links are used not only for navigation, but also for setting search and presentation parameters. In these applications the HTML format and the HTTP protocol are used like a user interface tool kit to provide not only document retrieval but a complete custom user interface specialized for the application.     

基于移动Agent和Web服务的分布式地理信息查找研究

提出并实现了一种基于移动Agent和Web服务进行分布式地理信息查找的系统框架。根据系统的查找策略移动Agent可以对分布于网络中的地理信息进行自主搜索,利用移动Agent和Web服务之间的交互可以允许多种类型的应用程序透明访问查找服务。     

利用Web Services实现铁路企业信息共享框架

为了实现铁路企业信息系统之间资源的集成和共享交流,本文给出了一种利用WebServices实现铁路企业信息共享的开发方案。具体阐述了共享框架的网络结构、系统集成设计,并给出了一种有效的安全模型。本框架能有效整合企业内部的业务系统,安全快捷的实现企业信息的共享,可进一步扩展铁路信息共享的范围。     

基于Web服务的数字城市信息资源共享平台

信息资源共享和互操作技术是数字城市建设中所要解决的核心问题。在分析已有互操作技术的基础上,结合最新的Web Services技术的技术特点,探讨了基于Web Services的互操作和资源共享技术,提出了面向数字城市的信息资源共享与互操作框架。     

语义Web服务——Web服务的扩展

语义Web服务是应用语义Web技术对Web服务的扩展.使信息具有语义就是用计算机内的Ontology中的概念作标记符对信息进行标记,对该过程予以支持的就是语义Web技术,即Ontology的构建技术、Ontology的使用技术(语义推理技术)和信息的语义标记技术.语义Web技术对Web服务的扩展可具体化为两项任务:服务提供者、服务请求者和服务注册处三类服务主体均内置Ontology;发布、查找和绑定三种交互信息均采用语义标记.     

基于服务QoS执行信息的Web服务推荐研究

基于服务的非功能（QoS）特性进行服务发现是面向服务计算领域的一个研究热点。为了克服服务QoS难以获取且动态变化的特点,提出一种基于已往QoS执行信息的Web服务推荐方法。首先给出一种可以方便记录QoS执行信息的系统框架;然后描述了基于时间加权的服务推荐的匹配算法;实验结果表明该推荐方法是可行和有效的。     

基于Mediator的Web Services无回溯反向链动态合成

提出了一个基于Medoator的Web services无回溯反向链动态合成框架,在该框架下提供了一种产生式建模方法和一种用于消除合成语义冲突的参数级本体,然后使用一种无回溯反向链算法进行合成．该合成方法避免了对合成方案的优化,它的参数级本体在合成语义处理上也比前向链合成中的属性级本体的效率高,特别适合于对同样的用户输入和Web services进行多次合成以生成相同的或者不同的输出．     

Web services notifications

As Web services have matured, they've also acquired the need for asynchronous push capabilities. Early Web services, such as those for getting traffic or weather reports or for performing currency exchange-rate calculations, were seemingly all remote procedure calls-oriented. In an RPC system, the receiver typically performs the requested service and sends a response back to the caller over the same connection on which the request arrived, which means the details required by the service for sending a reply are implicit in the RPC network connection. Unfortunately, these kinds of implied communication details are wholly inadequate for asynchronous push Web services.     

Web services policies

In addition to the basic Web services architecture, various specifications already exist for adding security, reliable messaging, and transaction mechanisms to Web services messages. All of these include numerous options to let them meet various application requirements. Specifying option choices for Web services in basic communication areas such as security, reliable messaging, privacy, and transactions is the immediate goal underlying efforts to define Web services policies.     

Web services push

Industry heavyweights Hewlett-Packard, IBM, Microsoft, Oracle, Sun Microsystems, BEA Systems and webMethods, have signed on to support VeriSign’s open standard-based framework that will let these vendors and others add security and authentication services to their Web services development tools.     

Understanding Web services

Web services are a new breed of Web applications. These independent application components are published on to the Web in such a way that other Web applications can find and use them. They take the Web to its next stage of evolution, in which software components can discover other software components and conduct business transactions. Examples of Web services include a credit card service that processes credit card transactions for a given account number, a market data service that provides stock market data associated with a specified stock symbol, and an airline service that provides flight schedule, availability, and reservation functionalities. Major vendors like IBM, Microsoft, Hewlett-Packard, and Sun, among others, are investing heavily in Web services technology. Ranging from simple to complex, Web services bring the promise of flexible, open-standards-based, distributed computing to the Internet     

Semantic Web services

The authors propose the markup of Web services in the DAML family of Semantic Web markup languages. This markup enables a wide variety of agent technologies for automated Web service discovery, execution, composition and interoperation. The authors present one such technology for automated Web service composition.     

基于GIS的交巡警地理信息系统

智能化交通（ITS）是将采集到的各种道路交通及服务信息,经交通管理中心集中处理后,实时、准确、高效地发挥全方位作用,缓解交通拥挤、阻塞状况,从而使路网上的交通流运行于最佳状态,最大限度地提高路网的通行能力,改善整个道路交通系统的机动性和安全性.本文探讨了有助于交通智能化的交巡警地理信息系统的解决方案和实现方法,并对该系统的软硬件环境、体系结构、系统内容、主要功能等方面进行了详细说明.本系统具有较强的实用性,在交巡警管理中发挥了重要作用,有利于促进国民经济的发展.     

基于SOA和Web服务的智能交通综合信息平台研究

针对各ITS系统建设中存在的问题,分析了面向服务体系结构和Web服务的理论及特点。基于SOA和Web Services技术提出了智能交通综合信息平台集成架构,分析了该平台的优势、集成的难点,对该平台的实现作了研究和分析,为交通信息的共享、交换、深加工和综合利用提供了一个理想的平台。     

Putting the "Web" into Web services. Web services interaction models.2

For pt.1 see ibid., vol.6, no.3, p. 89-91 (2002). As I discussed in my previous column, each different style of middleware promotes one or more interaction models that determine how applications based on that middleware communicate and work with each other. It is difficult to say what the best interaction models would be for Web services, mainly because the World Wide Web Consortium (W3C) is still developing the architecture. The author considers the use of remote procedure calls, Web services and messaging and interface complexity.     

基于三层组织模型的一种Web服务组合策略

在研究Web服务三层组织模型和有限状态自动机的基础上,提出了一种新的Web服务组合策略,给出了一个服务的可组合性定理,并证明了定理的正确性。该策略以Web服务三层组织模型为基础,简化了BPEL中基于有限状态自动机的Web服务自动组合,精简了服务组合流程。最后对这种新的组合策略的优缺点作了分析。