共查询到19条相似文献，搜索用时 890 毫秒
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文献领域主题信息检索应用数据库技术的系统研究是数字图书馆建设的关键之一。 当前,主题信息检索应用数据库技术的研究可在两个方面展开:XML的关系数据库应用研究, XML MARC的信息描述和主题检索。参考文献30。 相似文献
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XML检索系统及其比较研究* 总被引：2，自引：0，他引：2
探讨XML检索与传统信息检索的区别、XML检索的目标与任务以及XML检索系统研究的核心问题,并对现有的几个XML检索系统进行介绍和比较研究。 相似文献
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针对信息检索角度的XML的结构化检索问题,利用基于倒排文件的方法,使用NEXI作为检索语言,在基于XML的数字图书馆检索实验系统WHU-XML上对其进行实现,并具体分析查询语言的解析方法以及所采用的结构化检索算法。 相似文献
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与传统信息检索不同的是XML要实现元素级的检索,其核心是元素级检索模型的构建。而XML文档内上下文元素的相关性、元素之间信息的重复性以及元素大小的不一性等则是构建模型时面临的核心问题。解决办法是:构建基于BM25元素级XML检索模型,构建基于上下文的元素级XML检索模型BM25E,过滤重复元素,进行可检索元素的选择和太小元素的处理。表1。图1。参考文献19。 相似文献
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论文引入信息整合理论,对信息整合在网络信息检索系统中的应用问题进行探讨.文章在分析网络信息检索存在的问题后,探讨了采用信息整合原理来解决网络信息检索中的问题在理论上的可能性,提出信息整合理论是解决网络信息检索系统存在问题的一种有效策略的观点.信息整合的机制按照信息整合的层次可分为信息浅层整合、信息深层整合和信息语义整合三种类型.最后,文章论述了数据库整合、检索结果整合、应用程序整合和网络信息检索系统整合的步骤和方法,构建了数据库整合和网络信息检索系统整合的模型. 相似文献
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基于OKAPI的XML信息检索实现研究 总被引：3，自引：1，他引：3
OKAPI能实现强大的自由文本检索与评价功能,但要实现基于XML的信息检索,却要做适当改造。改造时,一方面尽量不破坏原有系统的体系结构,又要能实现对XML文档的索引、查询和表示。为此,必须完成面向XML的文档预处理和索引、面向XML的文档检索及检索模型的选择。图3。公式3。参考文献10。 相似文献
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医学信息检索对医学文稿编辑加工的作用 总被引：5，自引：1，他引：4
介绍医学信息检索相关数据库,探讨医学信息检索在参考文献等编辑加工中的作用.认为医学编辑应掌握关键词、医学信息检索技能,熟悉常用医学数据库的检索,利用医学信息检索提高工作效率及编校质量. 相似文献
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图像对象特征值的抽取、存储、转换、显现的实现有多种方法，SIMIIRS系统主要采用了数据库方法和XML方法。文章主要讨论了图像资源的XML描述方法、建立图像信息的XML索引文档，检索XML文档以实现图像信息查询与提供。 相似文献
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This paper presents a theoretical methodology to evaluate XML retrieval systems and their filters. Theoretical evaluation
is concerned with the formal investigation of qualitative properties of retrieval models. XML retrieval deals with retrieving
those document components that specifically answer a query, and filters are a method of delivering the most focussed answers.
Our theoretical evaluation critically analyzes how filters achieve this. 相似文献
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This paper investigates the impact of three approaches to XML retrieval: using Zettair, a full-text information retrieval system; using eXist, a native XML database; and using a hybrid system that takes full article answers from Zettair and uses eXist to extract elements from those articles. For the content-only topics, we undertake a preliminary analysis of the INEX 2003 relevance assessments in order to identify the types of highly relevant document components. Further analysis identifies two complementary sub-cases of relevance assessments (General and Specific) and two categories of topics (Broad and Narrow). We develop a novel retrieval module that for a content-only topic utilises the information from the resulting answer list of a native XML database and dynamically determines the preferable units of retrieval, which we call Coherent Retrieval Elements. The results of our experiments show that—when each of the three systems is evaluated against different retrieval scenarios (such as different cases of relevance assessments, different topic categories and different choices of evaluation metrics)—the XML retrieval systems exhibit varying behaviour and the best performance can be reached for different values of the retrieval parameters. In the case of INEX 2003 relevance assessments for the content-only topics, our newly developed hybrid XML retrieval system is substantially more effective than either Zettair or eXist, and yields a robust and a very effective XML retrieval. 相似文献
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This paper relates to the difficulty in retrieving precise information from big repositories of magazine articles in full text, and proposes an Extended Markup Language (XML) vocabulary for improving retrieval rates. The hypothesis tested was as follows: Magazine articles marked up with an XML vocabulary, indexed only by selected parts, give more precise search results than the same search using full text index.The study was exploratory with the following characteristics: 29 magazine articles were tested for results, 8 scholars were interviewed for defining 23 search strategies and evaluating results. The data showed that precision improved from 40.72% with full text search to 62.84% using XML markup and searching only in specific labels.Revision of the vocabulary and more testing has to be done by the library and information science community in order to obtain a valid vocabulary and provide more research results. Cultural characteristics and politics of librarians and information managers’ community are as important as technical issues in order to consider any technical proposal to be implemented successfully to achieve interoperability. 相似文献
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Mohamed Taher Amin Ahmed Khan Muhammed Burhanuddin 《International Information and Library Review》2013,45(4):337-345
This paper relates to the difficulty in retrieving precise information from big repositories of magazine articles in full text, and proposes an Extended Markup Language (XML) vocabulary for improving retrieval rates. The hypothesis tested was as follows: Magazine articles marked up with an XML vocabulary, indexed only by selected parts, give more precise search results than the same search using full text index.The study was exploratory with the following characteristics: 29 magazine articles were tested for results, 8 scholars were interviewed for defining 23 search strategies and evaluating results. The data showed that precision improved from 40.72% with full text search to 62.84% using XML markup and searching only in specific labels.Revision of the vocabulary and more testing has to be done by the library and information science community in order to obtain a valid vocabulary and provide more research results. Cultural characteristics and politics of librarians and information managers’ community are as important as technical issues in order to consider any technical proposal to be implemented successfully to achieve interoperability. 相似文献
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全文检索系统由三大功能模块组成：索引模块、检索模块和存储模块。本文着重分析系统组成和XML数据库的设计、建立倒排索引文件、中文分词等技术难点。同时在此基础之上建立基于Lucene/XML的期刊文献全文检索系统。 相似文献
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一种基于Native XML的全文检索引擎 总被引：5，自引：0，他引：5
随着XML的日益流行 ,基于XML的全文检索应用需求也迅速扩大。在这些应用中 ,native XML数据库是发展方向。虽然商业化的native XML数据库已经出现 ,但其全文检索的性能还不尽人意。本文提出一种方法 :在传统的倒排索引的框架下 ,对XML的标记建立索引 ,使得一个全文数据库能够以Native的方式存储、索引、检索和输出XML文档 ,成为一个真正意义上的native XML全文数据库 ,既有传统全文数据库的优越性能 ,又能满足基于na tive XML的应用需求 相似文献
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XML 数据库技术 总被引：4，自引：0，他引：4
郭瑞华 《现代图书情报技术》2004,20(9):61-65
为了顺应Internet发展的需要， XML数据库应运而生。XML数据库是一种新型的数据库技术，与传统数据库相比，它适合于对半结构化数据的存取管理；它能表示和移植数据以及具有集成异构数据库系统的能力。XML数据库技术的这些特别优势将会对网络信息资源的管理产生重大影响。 相似文献