基于视觉特征的图象搜索引擎设计与实现

文章将基于WWW的搜索引擎技术与基于数据库的图象检索技术有机结合起来,提出了一种基于视觉特征的图象搜索引擎方案,并实现了一个图象搜索引擎系统。该系统先用网络机器人在WWW上搜索图象,提取其颜色、纹理或形状特征,与提交的示例图象特征作比较,把图象的URL按与示例图象的相似度大小顺序存入数据库,然后从数据库中返回结果给用户,并在屏幕上显示。实验结果表明,该系统简单易行,能较好地满足用户的需求。     

A Multimedia Presentation Toolkit for the World Wide Web

This paper describes the design and implementation of MPRES, a Multimedia Presentation Toolkit for the WWW. The WWW has seen phenomenal growth over the last couple of years. It has become a vast repository of multimedia information that is accessible to virtually anyone having a browser. MPRES is a multimedia presentation system that allows a user to compose and render a presentation consisting of objects referenced by their URLs (Uniform Resource Locators). It uses the concept of dynamic documents to render on a WWW browser, a sequence of multimedia scenarios, having objects of types such as audio, image, plaintext, HTML (Hypertext Markup Language) document and animation. MPRES Author, the authoring subsystem, allows the user to interactively test and compose such a presentation, using the Netscape Navigator to collect multimedia resources from the WWW. A presentation database stores the presentations and provides a convenient frontend for accessing them. © 1997 John Wiley & Sons,Ltd.     

WebGALAXY: beyond point and click — a conversational interface to a browser

This paper presents WebGALAXY, a flexible multi-modal user interface system that allows wide access to selected information on the World Wide Web (WWW) by integrating spoken and typed natural language queries and hypertext navigation. WebALAXY extends our GALAXY spoken language system, a distributed client-server system for retrieving information from online sources through speech and natural language. WebGALAXY supports a spoken user interface via a standard telephone line as well as a graphical user interface via a standard Web browser using either Java/JavaScript or a cgi-bin/forms front end. Natural language understanding is performed by the system and information servers retrieve the requested information from various online resources including WWW servers, Gopher servers and CompuServe. Currently, queries about three domains are supported: weather, air travel, and points of interest around Boston.     

基于Agent的个性化智能信息检索系统

Internet空问中的信息资源是异构的．人们要想从Internet中发现、收集和维护自己需要的信息则要花费大量的时间和精力。虽然目前Internet上有很多的搜索引擎，如Yahoo、搜狐等，但这些引擎还存在着不少缺陷，如在适应用户兴趣、交互方式等方面均存在着不足。人们迫切需要一种工具以有效地利用Internet信息空间中的各种信息资源。本文是针对当前Internet检索系统中存在的不足，开发设计了一个“基于Agent个性化智能信息检索系统”。该系统的研究内容属目前智能信息检索领域的重要课题。     

WWW上的信息发现与搜索引擎技术

随着Ｉｎｔｅｒｎｅｔ在我国逐步得到普遍应用以及ＷＷＷ上中文信息量的不断增长，迫切需要研制适合我国国情的中英文Ｗｅｂ索引和检索服务系统。ＷＷＷ的信息发现和搜索引擎又称ｒｏｂｏｔ负责搜索物获取指定范围内的有关数据。本文对Ｗｅｂ搜索引擎的工作原理和关键技术进行讨论和分析，并分析了我们在研制中英文Ｗｅｂ索引和检索服务器方面所做的工作，包括系统总体结构和汉语分词技术等。     

WWW与数据库集成系统的用户权限管理

在WWW上的应用,越来越多的体现为多人合作应用形式,这些应用系统大多都需要通过WWW与数据库的集成来实现。但是由于WWW与数据库系统都有自己的用户权限管理,因此集成后在用户管理、权限设定及系统完整性方面就产生了一些问题。文章针对WWW与数据库集成系统,提出用户权限管理结构和机制,并设计了实际系统模型,它将服务器对用户的认证,转变成基于用户角色的对数据库的访问控制,不但能保护WWW与数据库的数据,而且能确保系统结合的完整性,同时更可以大量简化用户管理与权限管制的工作,提高权限管理的效率。     

基于自动分类的网页机器人

随着互联网的普及和发展，网络上的信息资源越来越丰富，它需要高效智能的工具来完成信息资源的采集。WWW上的网页抓取器，又称Robot讨论了抓取器与文本自动分类器相结合，对用户要求领域网页的收集。抓取器找到相关链接进行抓取，而避免对非相关链接的抓取。这样可以节省硬件、网络资源和提高抓取器的效率。     

Searching the World Wide Web with Lycos and Infoseek

This paper evaluates the use of the Lycos and InfoSeek search tools for information discovery of the World Wide Web (WWW). It concentrates on a close comparison between the services offered by each of these tools; focusing on search interfaces and languages, collection size and content, quality and indexing issues and the increasing move towards commercialisation of tools on the WWW which are used for organising and cataloguing resources. The paper concludes that both of these search tools are able to produce results of some value when WWW searching and each has strengths and weaknesses in certain areas. Quality and indexing issues have yet to be successfully addressed by the current database creation strategies used by these tools.     

基于最高响应比算法的WWW索引库更新方法

1 引言 WWW搜索引擎(Search Engine)利用网络蜘蛛收集WWW上的相关文档信息,通过分析、处理后,将相应的文档信息加入本地信息库,在用户给定其所关心的查询条件后,利用WWW搜索引擎所提供的检索查询系统从信息库中检索出符合用户要求的信息列表,并计算每条信息与用户要求的查询条件的相关程度,按照倒排序的方式返回给用户,使用户能够快速定位到他所关心的信息。由于搜索引擎提供了这样一种工具,使得用户可以在众多的网页信息中能够快速定     

甘肃科技文献共享平台架构及关键技术研究

甘肃科技文献共享平台包括五大系统:全文数据库检索及发布系统、异构数字资源统一检索系统、原文传递系统、用户管理及计费系统、统计分析系统。论述该平台的应用架构和技术架构,阐述其主要关键技术:统一检索、Web 2.0、Web服务及数据安全。运行实践表明,平台整合了173个资源数据库,实现"一站式"文献服务,提高了文献资源的集成程度,从而提高文献情报机构的服务水平、管理水平和市场竞争能力,减少文献资源的重复投资,减少内容相同的数据库资源的重复开发。     

基于WWW的网络信息共享系统

随着网络信息服务的发展,如何利用人（成千上万的网络用户）─一网络上最宝贵的资源来提高网络信息服务的质量,已经引起了众多学者的注意。文章提出的基于ＷＷＷ的网络信息共享系统,利用社会过滤技术为用户提供良好的信息交流途径,并以用户搜集整理的信息资源为基础建立开放目录服务,是对ＷＷＷ环境中用户合作及参与网络信息管理的有益尝试。     

中文网页分布式并行索引的设计与实现

Internet搜索引擎主要由搜索器、索引器和用户界面三部分组成。通过分析索引数据库在搜索引擎时效性及有效性方面的重要作用,提出一种多进程并行分词建立索引的方法。以中文网页数据库为基本语料库,采用正向最大匹配法进行中文分词,并用一种高效的倒排索引方式存储索引表。这种方法能够加快索引建立与更新的速度,并且在空间效率上也有较大的提高。     

基于Google的个性化搜索系统的设计与实现

互联网用户使用网络获取信息过程中,搜索引擎已成为必不可少的工具。传统的WWW搜索引擎是“提问——搜索”方式．对于所有用户给出同样的关键宇得到的检索结果都是一样的。本文基于传统搜索引擎Google的基础上,实现了个性化的搜索。论文重点阐述了基于向量空间模型的个性化搜索系统的设计和实现过程。系统返回结果能够根据不同用户的兴趣爱好给出用户满意度较好的结果。     

Automated Web navigation using multiagent adaptive dynamic programming

Today a massive amount of information available on the WWW often makes searching for information of interest a long and tedious task. Chasing hyperlinks to find relevant information may be daunting. To overcome such a problem, a learning system, cognizant of a user's interests, can be employed to automatically search for and retrieve relevant information by following appropriate hyperlinks. In this paper, we describe the design of such a learning system for automated Web navigation using adaptive dynamic programming methods. To improve the performance of the learning system, we introduce the notion of multiple model-based learning agents operating in parallel, and describe methods for combining their models. Experimental results on the WWW navigation problem are presented to indicate that combining multiple learning agents, relying on user feedback, is a promising direction to improve learning speed in automated WWW navigation.     

Finding Order in a Chaotic World

Abstract

The World Wide Web (WWW) has a decentralized information environment and a non-linear (hypertext) information structure. This non-linear structure allows users to retrieve information at many different levels but also increases the difficulty of information retrieval. Unlike a well-developed CD-ROM database, the WWW does not have a controlled searching environment and information can be indexed in many different ways. It takes a well planned search strategy to perform an effective search in the labyrinth of the WWW. The SIRO (Systematic Information Retrieval/Organization) model offers a research planning process designed specifically for information seekers in the agricultural disciplines. The intention is to enhance search results and organize retrieved information. This process starts with the identification of the information structure on the WWW, then proceeds by organizing and analyzing information in a visual diagram or a “thinking map.” This process leads searchers to logical sources on the WWW and a systematic analysis of the result.     

基于地理信息的旅游资源信息库系统

加强旅游资源管理,构建旅游资源信息库,对促进旅游业持续健康发展具有重要意义。针对旅游资源管理中存在的问题,在详细分析旅游资源管理的业务流程基础上,提出一种基于地理信息的旅游资源信息库系统。该系统采用三层体系架构,避免用户对数据的直接访问,提升系统的稳定性和扩展性;通过角色访问控制技术,实现授权用户按角色受限地访问系统功能,避免非法用户和授权用户的非法操作,提高系统的安全性;通过高德地图实现旅游资源单体空间数据与属性数据的无缝关联,提升用户体验。该系统可有效克服传统管理方式的不足,提升旅游资源管理的工作效率。     

Construction of a robot control system which understands a voice and pointing actions

This research was aimed at making a robot that can go and get an object designated by the user. We produced a robot control system that uses pointing and voice control. This control system is composed of two systems. One system is the object instruction system that uses pointing, and the other is the object instruction system that uses voice. The approximate position of a designated object is recognized by the object instruction system that uses pointing, and information about the object and instructions about the operation are conveyed by the object instruction system that uses voice. This time, the object instruction system that uses pointing has been designed and verified as the first step. A calculation resource to calculate the approximate position of the designated object is obtained when the user points directly at the object. A robot can be moved around a designated object by using this system. The object instruction system that uses voice will be constructed in future work.     

Mosaic and the World Wide Web

The World-Wide Web, an information service on the Internet, uses hypertext links to other textual documents or files. Users can click on a highlighted word or words in the text to provide additional information about the selected word(s). Users can also access graphic pictures, images, audio clips, or even full-motion video through hypermedia, an extension of hypertext. One of the most popular graphics-oriented browsers is Mosaic, which was developed at the National Center for Supercomputing Applications (NCSA) as a way to graphically-navigate the WWW. Mosaic browsers are currently available for Unix workstations running X Windows, PCs running Microsoft Windows, and Macintosh computers. Mosaic can access data in WWW servers, Wide Area Information Servers (WAIS), Gopher servers, Archie servers, and several others. The World-Wide Web is still evolving at a rapid pace. Distributed hypermedia systems on the Internet will continue to be an active area of development in the future. The flexibility of the WWW design, its use of hyperlinks, and the integration of existing WAIS and Gopher information resources, make the WWW ideal for future research and study. Highly interactive multimedia applications will require more sophisticated tools than currently exist. The most significant issue that needs to be resolved is the mismatch between WWW system capabilities and user requirements in the areas of presentation and quality of service