一种并行Web信息采集系统模型

根据国内外在信息采集领域的发展以及并行采集技术的研究，提出了一个基于多线程并行的Web信息采集结构模型，该模型以线程并行的方式对Web页面同时采集，实现了全面、高效并且灵活的信息搜集。     

基于元数据与Z39.50的分布协作式Web信息检索

Web上大量的异质、分布、动态的信息造成了“信息过载”.如何有效地为用户提供Web信息检索已经成为一项重要的研究课题.Web搜索引擎部分地解决了信息检索问题,然而其效果却远远不能令人满意.提出了Web信息检索的分布协作策略以取代传统的集中式信息检索方式;给出了一种新的Web信息检索系统模型,该模型支持对Web文档的元数据进行检索,并采用Z39.50协议作为接口标准,以克服不同信息检索系统之间的访问异构性.在此基础上,设计了一个分布协作式Web信息检索框架,用以帮助用户有效地进行Web信息检索.     

基于Web挖掘的个性化信息检索系统总体设计

随着网络信息的急速膨胀,为了方便用户快速查找所需信息,满足不同用户的个性化需求,在传统的信息检索系统的基础上发展个性化信息检索已成为必然.本文研究了个性化信息检索系统的整体架构设计,描述了该系统的主要功能模块和各个功能模块的工作机制.     

一种基于Agent的因特网信息获取系统

文中在分析传统的搜索引擎和离线济览软件优缺点的基础上,提出了一种基本代理的因特网信息获取方案,并实现了集自动下载、全文检索和离线济览功能于一体的WebClone系统,使用户获取和共享因特网信息更加方便。     

Retrieving information on the World Wide Web: effects of domain specific knowledge

In this study, we intend to examine information retrieval behaviors from a psychological point of view using a search engine on the World Wide Web (WWW). We investigated information retrieving behaviors in detail based on both the recorded data of retrievers’ web browsing actions and their thinking processes by the “think aloud” method. We focused on selected keywords for retrieving and compared them between retrievers who had enough knowledge about their task and those who did not. Our goal was to learn about the literacy needed for finding required information efficiently on the WWW.

Distributed Coordination and Workflow on the World Wide Web

This paper describes WebFlow, an environment thatsupports distributed coordination services on theWorld Wide Web. WebFlow leverages the HTTP Webtransport protocol and consists of a number of toolsfor the development of applications that require thecoordination of multiple, distributed servers.Typical applications of WebFlow include distributeddocument workspaces, inter/intra-enterprise workflow,and electronic commerce. In this paper we describe thegeneral WebFlow architecture for distributedcoordination, and then focus on the environment fordistributed workflow.     

基于网页信息检索的地理信息变化检测方法

针对地理信息变化频繁,难以及时发现的问题,提出了一种基于网页信息检索的地理信息变化检测方法,通过设计搜索条件在互联网上收集符合条件的网页,设计评价方法评价搜索结果的可信度,并对最终搜索结果进行统计和空间分析,实现基于网页信息检索技术的地理信息变化检测。以杭州地区为例,开发了基于Web的杭州地区地物变化检测系统,验证了该方法的可行性及有效性,为区域的地物变化检测提供了新方法。     

Web服务搜索技术综述*

随着Web服务应用的迅速发展与日益普及, 如何快速、准确地搜索到用户所需的Web服务成为了制约Web服务发展的关键问题之一。目前的Web服务搜索技术包括：基于UDDI注册中心、通过Web服务网站、使用专用搜索引擎与使用通用搜索引擎四种方式。对现有主要Web服务搜索技术进行了详细评述。在对典型Web服务搜索技术分析比较的基础上, 指出了建立专用的Web服务搜索引擎的必要性以及所面临的问题与挑战。     

基于P2P的个性化Web信息检索

为了克服Web搜索引擎在可扩展性、协作性和个性化等方面存在的不足,提出了一种基于Peer to Peer 的全分布、协作式、自组织的个性化Web信息检索,定义了以查询主题为中心进行主题聚类、数据组织和查询路由的用户协作共享策略,设计了协作生成用户兴趣列表向量、对相似语义查询进行主题聚类和更新、基于查询集建立倒排索引以及基于查询主题进行语义路由等算法和机制,以提供人性化、协作式、个性化的搜索。模拟实验表明,原型系统可以加快查询速度,减轻网络负荷,提高搜索的准确率。     

基于语义的信息获取服务平台的研究与实现

随着信息化建设的深入发展,应用系统积累的数据和信息资源越来越多.如何在不影响现有应用系统的配置和管理模式下,针对大量的分散和异构的应用,为用户提供快速准确的信息获取服务,已经成为一个亟待解决的问题.为此,提出了基于语义的信息获取服务平台,通过引入基于语义的全局数据视图对文档加以快速索引,并对索引进行切分和备份,同时采用针对性的相关性排序算法,为用户提供更好的信息获取服务.     

具有扩充检索功能的石油化工专业信息搜索引擎的设计与开发

网络信息的日益增加迫切需要适宜的检索工具,特别是进行专业信息的检索,需要体现专业词汇特点的搜索引擎。本文在对搜索引擎核心技术进行研究的基础上,提出了石油化工信息搜索引擎的设计方案,开发了网络机器人模块,实现了海量网页的自动获取;采用最短路径分词和正向最大匹配相结合的算法,实现了中文自动分词;开发了信息索引模块,实现了网页的批量索引和增量索引;开发了信息检索模块,提供布尔逻辑查询,实现摘要自动生成。通过系统集成,初步建立了体现石油化工专业特点的搜索引擎。     

The Continuous Media Web: a distributed multimedia information retrieval architecture extending the World Wide Web

The World Wide Web, with its paradigms of surfing and searching for information, has become the predominant system for computer-based information retrieval. Media resources, however information-rich, only play a minor role in providing information to Web users. While bandwidth (or the lack thereof) may be an excuse for this situation, the lack of surfing and searching capabilities on media resources are the real issue. We present an architecture that extends the Web to media, enabling existing Web infrastructures to provide seamless search and hyperlink capabilities for time-continuous Web resources, with only minor extensions. This makes the Web a true distributed information system for multimedia data. The article provides an overview of the specifications that have been developed and submitted to the IETF for standardization. It also presents experimental results with prototype applications.     

Gathering accurate client information from World Wide Web sites

This paper discusses the design and use of a number of simple measurement methods that are available to the developers of small World Wide Web (Web)systems. The focus is on how the resulting data can be used to assist with re-designing the initial system. The author argues that the analysis of viewer usage patterns, together with the need for ever more sophisticated collection should form an essential part of the development life cycle of a Web-based system. The conclusion outlines some desirable features of such tools, based on development and maintenance experience on a University site.     

Fuzzy User Modeling for Information Retrieval on the World Wide Web

Information retrieval from the World Wide Web through the use of search engines is known to be unable to capture effectively the information needs of users. The approach taken in this paper is to add intelligence to information retrieval from the World Wide Web, by the modeling of users to improve the interaction between the user and information retrieval systems. In other words, to improve the performance of the user in retrieving information from the information source. To effect such an improvement, it is necessary that any retrieval system should somehow make inferences concerning the information the user might want. The system then can aid the user, for instance by giving suggestions or by adapting any query based on predictions furnished by the model. So, by a combination of user modeling and fuzzy logic a prototype system has been developed (the Fuzzy Modeling Query Assistant (FMQA)) which modifies a user's query based on a fuzzy user model. The FMQA was tested via a user study which clearly indicated that, for the limited domain chosen, the modified queries are better than those that are left unmodified. Received 10 November 1998 / Revised 14 June 2000 / Accepted in revised form 25 September 2000     

Structured Cooperative Authoring for the World Wide Web

Alliance is a structured cooperative authoring application that allowspeople spread out across different locations to work together on documentproduction and maintenance. It uses the World Wide Web as an infrastructureto accomplish distributed document management, asynchronous group awareness,and communication and cooperation among distributed authors. A particularfeature of Alliance is that it can handle temporary disconnections from thenetwork without disrupting the cooperative editing. In this article wereport our experience in designing and implementing Alliance, focusing onthe mechanisms that needed to be developed in order to support cooperativeauthoring using the Web.     

Information retrieval on the World Wide Web

Effective search and retrieval are enabling technologies for realizing the full potential of the Web. The authors examine relevant issues, including methods for representing document content. They also compare available search tools and suggest methods for improving retrieval effectiveness     

主题Web挖掘研究

网络已经成为人们获取知识的一个重要途径。然而面对巨大的Web资源库,用户若想获得所需要信息已不再是一件简单的事情。通用搜索引擎返回大量的无关信息．不能满足用户的特定信息检索需求。针对这个问题,Web信息检索领域出现了一个新的研究方向——主题驱动的Web资源发现。介绍了通用搜索引擎的基本结构、工作原理及现状。阐述了主题Web挖掘的研究背景、任务及目前研究技术的进展,并对其未来的发展方向进行了探讨。对通用搜索引擎和主题Web挖掘的关系进行了分析。     

Known-Item Searching on the World Wide Web

Abstract

With the explosion of the World Wide Web, numerous search engines have proliferated online, claiming to be the best, fastest, or most accurate. Though each product is slightly different from the others in its presentation and search architecture, what all are providing is keyword searching of the Web's millions of pages. However, there are circumstances, just like in a library catalog, where an individual may want to perform a known-item search rather than a keyword search. The purpose of this paper was to discover whether known-item searches are possible with some of the Web's most popular search engines, and if the results retrieved using such a search would be satisfactory to a user. The author tested and compared four major Web search engines, using the most sophisticated search techniques available. Thirty-nine sites were selected and searched by title, and ranked according to the relevance and order of the displayed results.     

主题Web挖掘研究

网络已经成为人们获取知识的一个重要途径.然而面对巨大的Web资源库,用户若想获得所需要信息已不再是一件简单的事情.通用搜索引擎返回大量的无关信息,不能满足用户的特定信息检索需求.针对这个问题,Web信息检索领域出现了一个新的研究方向--主题驱动的Web资源发现.介绍了通用搜索引擎的基本结构、工作原理及现状.阐述了主题Web挖掘的研究背景、任务及目前研究技术的进展,并对其未来的发展方向进行了探讨.对通用搜索引擎和主题Web挖掘的关系进行了分析.     

环球网图象搜索引擎研究综述

提出了建立一个ＷＷＷ图象搜索引擎的方案，搜索引擎在Ｉｎｔｅｒｎｅｔ上浏览主页，对遇到的图象进行特征计算，抽取出索引信息，存储索引向量，根据图象内容进行相似图象的查找。分析了颜色直方图、边缘方向直方图、纹理分析和形状不变性等基于图象内容查询的技术，并对ＷＷＷ图象搜索引擎的发展作出了预测。