基于本体的语义检索技术研究与实现

在本体基础上通过语义相似度和相关度的计算,利用语义推理将描述的隐含语义显式化,以充分挖掘出与检索内容相关的信息,实现相关信息的语义融合,提高查准率和查全率。研究基于本体的语义相似度和相关度的计算方法,并通过该语义检索方法的实现,证明该方法在语义检索系统开发中的可行性。     

基于网页摘要分析的元搜索引擎研究*

针对目前搜索引擎返回结果的海量性，构建一个元搜索引擎，旨在高效利用多个成员搜索引擎返回的结果。介绍元搜索引擎的基本架构及当前结果融合的主要方法，应用统计学方法研究网页标题、网页摘要与网页文本之间的相关性关系，从而确定相关度权值进行结果相关性判断。实验证明，元搜索引擎搜索结果的平均准确率比各个成员引擎的搜索结果平均准确率都有较大提高。     

跨库检索策略研究

本文在研究跨库检索系统的基础上，根据跨库检索系统特点提出制定跨库检索策略的方法。     

垂直搜索引擎发展概述

本文分析了垂直搜索引擎的产生，与水平搜索引擎的区别所在，数据来源，盈利模式以及发展方向。     

Anonymous personalization in collaborative web search

We present an innovative approach to Web search, called collaborative search, that seeks to cope with the type of vague queries that are commonplace in Web search. We do this by leveraging the search behaviour of previous searchers to personalize future result-lists according to the implied preferences of a community of like-minded individuals. This technique is implemented in the I-SPY meta-search engine and we present the results of a live-user trial which indicates that I-SPY can offer improved search performance when compared to a benchmark search engine, across a variety of performance metrics. In addition, I-SPY achieves its level of personalization while preserving the anonymity of individual users, and we argue that this offers unique privacy benefits compared to alternative approaches to personalization.     

Quality and relevance of domain-specific search: A case study in mental health

When searching for health information, results quality can be judged against available scientific evidence: Do search engines return advice consistent with evidence based medicine? We compared the performance of domain-specific health and depression search engines against a general-purpose engine (Google) on both relevance of results and quality of advice. Over 101 queries, to which the term ‘depression’ was added if not already present, Google returned more relevant results than those of the domain-specific engines. However, over the 50 treatment-related queries, Google returned 70 pages recommending for or against a well studied treatment, of which 19 strongly disagreed with the scientific evidence. A domain-specific index of 4 sites selected by domain experts was only wrong in 5 of 50 recommendations. Analysis suggests a tension between relevance and quality. Indexing more pages can give a greater number of relevant results, but selective inclusion can give better quality.     

数字资源整合检索协议研究

简要地论述了数字资源整合检索的必要性、模式、以及联接方式和联接方法，并详细地介绍了三种数字资源整合检索的协议：Z39．50、OAI、OpenuRL。     

视频元数据全文检索系统的研究与实现

本文阐述了采用XML文档按照MPEG 7标准描述视频数据的趋势 ,研究了适合于半结构化视频描述的全文检索索引结构。该索引保存了文档中的结构信息 ,从而可以对视频数据进行全方位多层次的查询。提出了一些缩减索引空间的策略和算法。     

关于自然语言检索问题

自然语言检索当前仅在关键词检索的层次上已经实现，重点分析了全文检索所适应和不适应的检索要求及其评价，用分析说明了当前关于自然语言检索的主流观点的不切实际，指出自然语言检索的发展方向是与情报检索语言结合和融合。     

网络信息资源检索策略与方法

国内外众多网站都开辟了有关于检索策略与方法的专栏，本汇集一些具有代表性的网站，以使网络用户系统地学习到网络信息检索方法和技巧。