【作者】 柯青；

【导师】 焦玉英；

【作者基本信息】 武汉大学 ， 情报学， 2004， 硕士

【摘要】 20世纪80年代以来，随着因特网的发展和信息技术的进步，网上的信息资源越来越丰富，在数量越来越庞大的同时，网上信息也呈现出多种多样、结构互异的特征。但是网上信息资源缺乏一个统一的描述标准，不同的异构信息之间交换没有一个恰当的协议。因此研究网络环境下，异构信息检索的标准体系成为当前信息检索领域的一个研究热点。本文基于上述思想，从横向和纵向两个角度，系统的研究了目前用于网上异构信息检索的一些主要的协议和规范。 论文共分三部分： 第一部分包括文中的第一章，首先分析当前网络信息资源的特点，及对网上信息检索系统提出的新要求；接着研究了网上异构信息的发展现状及当前研究的主要内容；最后总结了异构信息检索的研究现状和存在问题。 第二部分包括文中的第二章至第六章，这是本论文的重点和难点，主要介绍了当前用于网上异构信息检索的一些主要协议和规范。鉴于元数据、Z39.50及XML在实际运用中的重要性及广泛性，分别用一章的篇幅较详细的介绍了这三种协议的概念、对信息检索的意义、体系结构、实际中的应用、存在的问题及发展趋势。第五章则对其它常见的协议和规范较简略的系统介绍。第六章在前文分析的基础上，对本文所论及的标准从起源、制订目的、应用领域、体系结构等角度作横向比较，本章亦可看成第二部分的小结和深化。 第三部分包括文中的第七章，总结了本论文研究的理论指导意义和实践指导意义，分析了文中未能解决的问题和原因，并对下一步研究提出展望。 标准的制订也是随时代的发展呈现动态的特征，新的标准不断的被制订出来并用于实践，旧的标准也面临被淘汰的必然，在当前背景下，研究网络异构信息检索的标准无疑具有重要的意义。随着这项工作的开展，各行各业对如何选择本行业最适合的用于集成异构数据间的协议和规范将有更加清晰的认识。更多还原

【Abstract】 With the development of Internet and the progress of the information technology, the web information resources have become more and more since the 1980s. The web information resources are various and different in structure as well as its quantity is larger and larger. But it is lack of a description standard, and there isn’t a proper protocol for different information exchange. Therefore, a research on the standard system of heterogeneous information retrieval under the web environment becomes an important topic of current information retrieval area. Based on the above backgrounds and from different points of view, the paper gives a systematic research on some main protocols and criterions which are used on the web heterogeneous information retrieval now.The paper is divided into three parts:The first part(chapter 1 included) fistly analyses the characters of current web information resources and the new requirement on the web information retrieval system; followly it investigates the development of web heterogeneous information and the main topic of current study; At last, it gives a summary on the actualities and existent problems of heterogeneous information retrieval.The second part(chapter 2 to chapter 6) is the emphases and difficulties of the paper, which mainly introduces some protocols and criterions on the web heterogeneous information retrieval. In view of the importance and universality of Metadata Z39.50 XML in the practice, each is given one chapter to introduce the concepts the significance to information retrieval system structure their use in practice, current problems and development trend. Chapter 5 gives a systematic introduction on other usual protocols and criterions. Based on former analysis, chapter 6 gives a compare on the origin the purpose of planning application area system structure etc. of these standards. Chapter 6 can also be seen as the conclusion and deepening of the second part.The third part(chapter 7 included) summaries the theory and practice instruction significance of the paper, analyses the reason for the unsolved problems, and provides the outlook for further study.With the progress of time, the planning of standards is also changing. New standards are increasingly provided and used for practice, and old standards are consequentially out of data. Under current background, a research on the web heterogeneous information retrieval has an important sense. With the task going on, many industries can have a better understanding on how to choose the best standards for the interoperating of different data.更多还原