XML信息检索中基于反馈的查询扩展分析     

鲁远  余宏  王芳 《科技广场》2012,(6):139-143

XML信息检索中,提高检索准确率的有效途径就是基于反馈机制的用户查询扩展。根据反馈机制的不同,文章对国内外研究XML查询扩展的文献进行了分类分析,重点分析、比较了几篇有影响文献的扩展方法和实验结果。在深入分析的基础上提出了当前研究中存在的几点不足,并对未来的研究工作作出了一些简单的预测和展望。  相似文献   

利用Informix数据库查询语言和UNIX命令生成网页     

魏建斌 《甘肃高师学报》2010,15(5):55-58

主要阐述了利用informix数据库的查询语言和UNIX命令生成网页.  相似文献   

Information retrieval in the workplace: A comparison of professional search practices     

Tony Russell-Rose  Jon Chamberlain  Leif Azzopardi 《Information processing & management》2018,54(6):1042-1057

Legal researchers, recruitment professionals, healthcare information professionals, and patent analysts all undertake work tasks where search forms a core part of their duties. In these instances, the search task is often complex and time-consuming and requires specialist expertise to identify relevant documents and insights within large domain-specific repositories and collections. Several studies have been made investigating the search practices of professionals such as these, but few have attempted to directly compare their professional practices and so it remains unclear to what extent insights and approaches from one domain can be applied to another. In this paper we describe the results of a survey of a purposive sample of 108 legal researchers, 64 recruitment professionals and 107 healthcare information professionals. Their responses are compared with results from a previous survey of 81 patent analysts. The survey investigated their search practices and preferences, the types of functionality they value, and their requirements for future information retrieval systems. The results reveal that these professions share many fundamental needs and face similar challenges. In particular a continuing preference to formulate queries as Boolean expressions, the need to manage, organise and re-use search strategies and results and an ambivalence toward the use of relevance ranking. The results stress the importance of recall and coverage for the healthcare and patent professionals, while precision and recency were more important to the legal and recruitment professionals. The results also highlight the need to ensure that search systems give confidence to the professional searcher and so trust, explainability and accountability remains a significant challenge when developing such systems. The findings suggest that translational research between the different areas could benefit professionals across domains.  相似文献   

A knowledge-based semantic framework for query expansion     

Jamal Abdul Nasir  Iraklis Varlamis  Samreen Ishfaq 《Information processing & management》2019,56(5):1605-1617

Searching for relevant material that satisfies the information need of a user, within a large document collection is a critical activity for web search engines. Query Expansion techniques are widely used by search engines for the disambiguation of user’s information need and for improving the information retrieval (IR) performance. Knowledge-based, corpus-based and relevance feedback, are the main QE techniques, that employ different approaches for expanding the user query with synonyms of the search terms (word synonymy) in order to bring more relevant documents and for filtering documents that contain search terms but with a different meaning (also known as word polysemy problem) than the user intended. This work, surveys existing query expansion techniques, highlights their strengths and limitations and introduces a new method that combines the power of knowledge-based or corpus-based techniques with that of relevance feedback. Experimental evaluation on three information retrieval benchmark datasets shows that the application of knowledge or corpus-based query expansion techniques on the results of the relevance feedback step improves the information retrieval performance, with knowledge-based techniques providing significantly better results than their simple relevance feedback alternatives in all sets.  相似文献   

基于Oracle Spatial的空间查询技术及其优化     

熊雷 《教育技术导刊》2008,7(8):7-9

从Oracle Spatial的空间查询分析出发,结合实例分析了它的查询模型、空间算子以及常用的空间函数,最后给出了Oracle Spatial中空间查询的优化建议。  相似文献   

分布式文献数据库查询系统的构建及分析     

吴志强 《情报科学》2004,22(10):1254-1256,1260

针对目前网上文献查询遇到的问题，本文探讨把多个分散的文献数据库联合起来，构建一个分布式文献数据库查询系统。经分析，该系统能够大大减少用户的通讯代价和数据处理时间，而且，把查询数据存储起来．，建立自身的查询记录数据库，能够进一步减少查询代价。该系统构建简单，具有应用与推广意义。  相似文献   

仪器仪表台班费用查询引擎的设计与实现     

何春筱 《重庆第二师范学院学报》2005,18(3):39-42

研究了目前流行的ADO数据访问机制,同时利用Delphi 7提供的ADO组件连接加密的Access数据库,设计了一个具体模型即安装工程中仪器仪表查询系统的子系统--台班费用查询引擎,并在Windows XP、Delphi 7和Access XP系统中测试通过.在此基础上分析了"Delpjhi ADO Access"组合的优点和不足.  相似文献   

《长恨歌》“讽谕说”质疑     

傅兴林 《河池学院学报》2001,(3)

在对《长恨歌》主题的研判中 ,持“讽谕说”者在认识、理解乃至研究方法等方面 ,存在着较为明显的偏颇。本文着重从陈鸿对《长恨歌》主题的妄猜、历代评论家常犯的美刺原则扩大化错误以及他们对《长恨歌》主题倾向枉解三方面 ,对“讽谕说”提出了质疑 ,从而指出 ,推崇“讽谕说”者 ,是在忽视文本、背离作者本意的情况下 ,以比附、推演的方式不适地为《长恨歌》确定了“讽谕说”的主题。  相似文献   

检索词模糊聚类基础上的上下文相关提问扩展算法     

董丕彦  马巍 《情报科学》2004,22(8):967-970

本文介绍了利用相关词进行提问扩展的算法。该算法建立在检索词模糊聚类的基础上，聚类以检索词在文献中共同出现为标准，与提问中检索词相关的群集形成提问的上下文，群集中属于上下文的检索词可用于提问的扩展。实验表明该算法提高了检准率。  相似文献   

基于Apriori改进算法的局部反馈查询扩展   总被引：1，自引：0，他引：1  

陈燕红  黄名选 《现代图书情报技术》2007,2(9):84-87

提出面向查询扩展的Apriori改进算法，采用三种剪枝策略，极大提高挖掘效率；针对现有查询扩展存在的缺陷，提出基于Apriori改进算法的局部反馈查询扩展算法，该算法用Apriori改进算法对前列初检文档进行词间关联规则挖掘，提取含有原查询词的词间关联规则，构造规则库，从库中提取扩展词，实现查询扩展。实验结果表明该算法能够提高信息检索性能，与现有算法比较，在相同查全率水平级下其平均查准率有了明显提高。  相似文献