语义Web上本体与智能信息Agent的集成研究

该文介绍了语义Web新技术,它可以为处理Web信息的智能应用程序提供帮助。文中描述了语义Web的层次结构及其支持语义Web的基础技术如RDF(资源描述框架)和本体(Ontology)等,文章表明,Agent技术与本体的集成会扩展程序能力,更有效地为用户执行任务而较少需要人的干预,也会对Web服务的使用产生重大影响。文中介绍了本体与智能信息Agent结合的应用实例,为用户搜索Web上的服务提供帮助。     

一个基于Agent的跨语种搜索模型

文章提出了一个在Web上查找信息的跨语种搜索模型,该模型基于Agent技术设计,由用户交互Agent、自动翻译Agent和网络搜索Agent组成,能够帮助用户跨越语言障碍,获取Internet上用其他语种表示的信息.详细讨论了该模型的结构和工作流程,并介绍了基于该模型实现的服务.     

基于情境面向Web服务的软件安全中间件模型

针对动态、开放的环境,提出了一种基于情境面向Web服务的软件安全中间件模型.该模型通过定义策略规则,使Agent在不中断Web服务运行的情况下,动态调整用户的访问控制.通过对用户及Web服务的情境信息的收集和管理,使得Agent在决策用户的访问控制时,能够动态地适应环境变化.基于该软件安全中间件模型,提出了一种基于规则和本体的策略语言ReiC及其相应的混合推理机制,弥补了单一规则和本体在构建知识库方面能力的不足.     

基于Agent的语义web服务发现模型研究

Web服务发现是Web服务系统架构的重要部分,现有的主流Web服务发现方法采用基于UDDI框架的服务匹配。针对现有服务发现模型缺乏对语义信息的支持和发现精确程度不高的问题,本文在讨论Agent技术与语义Web服务技术的基础上,提出了一个基于Agent的语义Web服务发现模型,使服务发现的过程更加智能,也提高了服务发现的精确度,并设计了一个原型系统来验证所提出的服务发现方法的可行性。     

基于Agent面向服务体系结构中的服务查询与选择

面向服务研究的一个重点问题是如何智能集成或协同分布在网络上的各种服务,以完成更为复杂的应用目标,使之能适应开放动态的网络计算环境和不断演化的用户个性化需求.把Agent技术与技术比较成熟的SOAP/WSDL/UDDI体系结合起来,是一个可行的解决方案.利用Agent技术设计了一个面向服务动态协同架构模型,解决了智能集成服务问题.着重研究并设计了一个基于Agent的服务查询与选择框架模型.这一模型利用移动Agent的移动性、自治性、智能推理性,实现了Web服务的智能查询与选择,从而解决了智能集成服务问题.     

保障QoS的服务决策系统的研究与设计

随着Web服务架构在企业信息化中应用的普及,针对Web服务的服务质量(QoS)需求,提出了多Agent协作机制下保障QoS的服务决策系统;通过对传统的Web服务架构的研究,扩展了UDDI注册中心,使其能够实现QoS属性的描述、发布、查询和更新;在此基础上加入了用户Agent、服务商Agent和决策Agent,在多Agent协助和交互的机制下,给出主客观赋权排序的群决策算法;算法综合考虑了QoS的主观需求和客观条件,使系统实现保障QoS的服务决策。     

基于本体的多Agent内容感知通信模式研究

多Agent系统是指定由多个可执行网络计算Agent组成的集合,每个Agent能与其他Agent通信、交互、彼此协同工作,完成共同的任务,而语义Web是用本体来描述的Web服务,在提出一种新的知识通信模式,通过智能Agent对万维网上Web服务来实现内容感知,使不同领域的智能通信个体能够互相理解彼此发送的消息,从而实现通信双方对通信内容的正确理解,达到无歧义、高效的通信质量。     

基于Agent和QoS动态选择Web服务的方法

在典型SOA结构中,Web服务的选择通常是根据静态数据进行.文中介绍了一个利用QoS信息和Agent技术来进行动态Web服务选择的方法,它可以使服务消费者在运行时动态选择最合适的Web服务.     

基于Agent技术的Web服务研究

Web服务以其平台独立性和语言独立性等特征掀起了一场网络技术架构的革命,随着应用领域的推广,人们对Web服务本身提出了更高的要求。本文提出了三种基于Agent技术的Web服务框架,使得Web服务能够为用户提供更高质量的、更完善的服务。     

基于多Agent的Web Service QoS模型

Web Service是采用面向服务的体系架构的基于标准的Web协议的软件构件,而Agent是一种在异构环境中自主行动以实现其设计目标的智能化软件实体。文章研究了利用Agent技术来进行动态发现、绑定符合用户QoS需求的Web Service,从而能够为用户提供更好的服务。     

VoiceXML dialog system of the multimodal IP-Telephony—The application for voice ordering service

The development of IP-Telephony in recent years has been substantial. The improvement in voice quality, the integration between voice and data, especially the interaction with multimedia has made the 3G communication more promising. The value added services of Telephony techniques alleviate the dependence on the phone and provide a universal platform for the multimodal telephony applications. For example, the web-based application with VoiceXML has been developed to simplify the human–machine interaction because it takes the advantage of the speech-enabled services and makes the telephone-web access a reality. However, it is not cost-efficient to build voice only stand-alone web application and is more reasonable that voice interfaces should be retrofitted to be compatible or collaborate with the existing HTML or XML-based web applications. Therefore, this paper considers that the functionality of the web service should enable multiple access modalities so that users can perceive and interact with the site in either visual or speech response simultaneously. Under this principle, our research develops a prototype system of multimodal VoIP with the integrated web-based Mandarin dialog system which adopts automatic speech recognition (ASR), text-to-speech (TTS), VoiceXML browser, and VoIP technologies to create user friendly graphic user interface (GUI) and voice user interface (VUI). The users can use traditional telephone, cellular phone, or even VoIP connection via personal computer to interact with the VoiceXML server. In the mean time, the users browse the web and access the same content with common HTML or XML-based browser. The proposed system shows excellent performance and can be easily incorporated into voice ordering service for a wider accessibility.     

CTW: an integrated computer and telephone‐accessed WWW system

This work presents the development of an integrated computer and telephone‐accessed WWW system (CTW) to provide a ubiquitous web access service. The CTW system serves as an intermediary between the telephone user and web sites. The CTW system retrieves and then converts the proposed Hyper Phone Markup Language (HPML) specified web pages into speech patterns. Telephone users can access information, including form‐based transaction services, on HPML‐specified web pages using a telephone set anywhere in the world by connecting to the CTW system. Another feature of CTW is that HPML‐ specified web pages stored in cyberspace can also be accessed via regular browsers, including the current Netscape Navigator and Microsoft Internet Explorer. The CTW system provides a ubiquitous web access service for users at any degree of web‐literacy by integrating well‐installed telephone networks and the Internet. Copyright © 2000 John Wiley & Sons, Ltd.     

Key factors in web latency savings in an experimental prefetching system

Although Internet service providers and communications companies are continuously offering higher and higher bandwidths, users still complain about the high latency they perceive when downloading pages from the web. Therefore, latency can be considered as the main web performance metric from the user??s point of view. Many studies have demonstrated that web prefetching can be an interesting technique to reduce such latency at the expense of slightly increasing the network traffic. In this context, this paper presents an empirical study to investigate the maximum benefits that web users can expect from prefetching techniques in the current web. Unlike previous theoretical studies, this work considers a realistic prefetching architecture using real traces. In this way, the influence of real implementation constraints are considered and analyzed. The results obtained show that web prefetching could improve page latency up to 52% in the studied traces.     

结合使用挖掘和内容挖掘的web推荐服务

随着Internet的基础结构不断扩大和其所含信息的持续增长,Internet用户越来越感觉容易在WWW服务中“资源迷向”。提高用户访问效率的方法有页面预取技术,站点动态重构技术和web个性化推荐技术等。现有的大多数web个性化推荐技术主要是基于用户使用记录的数据挖掘方法,没有或很少考虑结合页面内容—这才是用户真正感兴趣的。该文提出一种结合用户使用挖掘和内容挖掘的web推荐服务,该推荐服务根据频繁最大前向访问路径,提出含有导航页和内容页的频繁访问路径图概念,根据滑动窗口内的最近用户访问页面内容和候选推荐集中页面内容相关性,来向用户提供个性化推荐服务。经推荐质量分析,这种方法具有较好的推荐优化能力。     

BioMen: an information system to herbarium

This paper presents the development of BioMen (Biological Management Executed over Network), an Internet-managed system. By using service ontologies, the user is able to perform services remotely from a web browser. The services are managed by means of a Multi-Agent System, i.e. an Input/Output system, which interacts with the web server. In addition, artificial intelligence techniques have been incorporated so that the necessary information may be obtained for the study of biodiversity. We have built a tool which will be of particular use to botanists and which can by accessed from anywhere in the world thanks to Internet technology. In this paper, we shall present the problems we encountered when building this tool and how we managed to overcome them.     

ContextGrid: A contextual mashup-based collaborative browsing system

Due to a large amount of resources (i.e., information and knowledge) available on world wide web, it has been more difficult for users to effectively find relevant web resources. Most of the current web browsing methods and systems have been investigated to apply adaptive approaches which can extract personal contexts (e.g., interests and preferences) of the users. In this paper, we propose a contextual mashup-based collaborative browsing (co-browsing) platform, called ContextGrid, for providing online users with various knowledge sharing services. Particularly, the proposed mashup scheme can integrate heterogeneous pieces of information collected by various Open APIs, and assist the users to decide which partners should be selected for mutual collaborations. In order to evaluate the proposed mashup-based method, we have implemented a co-browsing platform which can exchange bookmarks, and measured whether the contextual mashup scheme makes a meaningful influence on improving the performance of the co-browsing process with multiple users.     

A trustworthy QoS-based collaborative filtering approach for web service discovery

Many network services which process a large quantity of data and knowledge are available in the distributed network environment, and provide applications to users based on Service-Oriented Architecture (SOA) and Web services technology. Therefore, a useful web service discovery approach for data and knowledge discovery process in the complex network environment is a very significant issue. Using the traditional keyword-based search method, users find it difficult to choose the best web services from those with similar functionalities. In addition, in an untrustworthy real world environment, the QoS-based service discovery approach cannot verify the correctness of the web services’ Quality of Service (QoS) values, since such values guaranteed by a service provider are different from the real ones. This work proposes a trustworthy two-phase web service discovery mechanism based on QoS and collaborative filtering, which discovers and recommends the needed web services effectively for users in the distributed environment, and also solves the problem of services with incorrect QoS information. In the experiment, the theoretical analysis and simulation experiment results show that the proposed method can accurately recommend the needed services to users, and improve the recommendation quality.     

基于QoS的Web服务动态组合模型

提出一种基于QoS的Web服务动态组合模型,可以根据用户对服务质量的请求,动态地选择最适合的Web服务进行绑定.与原有模型相比,扩展了服务代理的功能.其提供的绑定功能可用于保存服务调用的上下文和历史信息,以便提高下次访问的效率.另外,支持对子服务的划分,可以将大粒度的服务请求划分成子服务,并对服务的调用次序进行更合理地安排和优化.性能分析结果表明,该模型极大地提高了效率.     

一种基于WSDL的Web服务QoS管理框架

随着Internet的发展,Web服务得到广泛应用,如何选择满足用户非功能性需求的Web服务是其中的一个重要问题。基于此,提出一种基于WSDL的Web服务QoS管理框架,引入多维QoS对Web服务的QoS需求进行全面分析,定义Web服务的多维QoS属性,并在此基础上基于WSDL实现了Web服务的QoS管理框架。