搜索引擎查询日志的词性标注和挖掘研究   总被引：1，自引：0，他引：1  

赖茂生  屈鹏 《现代图书情报技术》2009,25(4):50-56

利用搜狗（Sogou）2007年3月的查询日志,使用词性标注方法,得出高频词性标注结果的分布特征。发现用户在查询中以使用名词为主,动词为辅,鲜有其它词类出现在高频词性标注结果中。以“的”为代表的虚词较少地出现在高频词性标注结果中。网络搜索的查询式与自然语言在句法上存在一定差异,但也有相通之处。用户主要使用名词进行概念性检索,关键词仍为用户进行检索的主要手段。高频词性标注结果部分符合Zipf定律。  相似文献   

Modeling actions of PubMed users with n-gram language models     

Jimmy Lin  W. John Wilbur 《Information Retrieval》2009,12(4):487-503

Transaction logs from online search engines are valuable for two reasons: First, they provide insight into human information-seeking behavior. Second, log data can be used to train user models, which can then be applied to improve retrieval systems. This article presents a study of logs from PubMed^®, the public gateway to the MEDLINE^® database of bibliographic records from the medical and biomedical primary literature. Unlike most previous studies on general Web search, our work examines user activities with a highly-specialized search engine. We encode user actions as string sequences and model these sequences using n-gram language models. The models are evaluated in terms of perplexity and in a sequence prediction task. They help us better understand how PubMed users search for information and provide an enabler for improving users’ search experience.  相似文献   

Evaluation of query expansion using MeSH in PubMed     

Zhiyong Lu  Won Kim  W. John Wilbur 《Information Retrieval》2009,12(1):69-80

This paper investigates the effectiveness of using MeSH^® in PubMed through its automatic query expansion process: Automatic Term Mapping (ATM). We run Boolean searches based on a collection of 55 topics and about 160,000 MEDLINE^® citations used in the 2006 and 2007 TREC Genomics Tracks. For each topic, we first automatically construct a query by selecting keywords from the question. Next, each query is expanded by ATM, which assigns different search tags to terms in the query. Three search tags: [MeSH Terms], [Text Words], and [All Fields] are chosen to be studied after expansion because they all make use of the MeSH field of indexed MEDLINE citations. Furthermore, we characterize the two different mechanisms by which the MeSH field is used. Retrieval results using MeSH after expansion are compared to those solely based on the words in MEDLINE title and abstracts. The aggregate retrieval performance is assessed using both F-measure and mean rank precision. Experimental results suggest that query expansion using MeSH in PubMed can generally improve retrieval performance, but the improvement may not affect end PubMed users in realistic situations.  相似文献   

Current research issues and trends in non-English Web searching     

Fotis Lazarinis  Jesús Vilares  John Tait  Efthimis N. Efthimiadis 《Information Retrieval》2009,12(3):230-250

With increasingly higher numbers of non-English language web searchers the problems of efficient handling of non-English Web documents and user queries are becoming major issues for search engines. The main aim of this review paper is to make researchers aware of the existing problems in monolingual non-English Web retrieval by providing an overview of open issues. A significant number of papers are reviewed and the research issues investigated in these studies are categorized in order to identify the research questions and solutions proposed in these papers. Further research is proposed at the end of each section.

Efthimis N. EfthimiadisEmail:

  相似文献   

基于内容的音频数据检索研究     

刘文辉  蚩志锋 《喀什师范学院学报》2009,30(6):57-59

如何自动对音频的内容进行快速有效的检索已经成为目前一个受到重视的问题．为此,给出了基于内容的音频检索的一般方法,并研究了一种基于模糊聚类音频例子检索算法．  相似文献   

The influence of mental models on undergraduate students’ searching behavior on the Web     

Yan Zhang 《Information processing & management》2008

  相似文献   

Adapting information retrieval systems to user queries     

Giridhar Kumaran  James Allan   《Information processing & management》2008,44(6):1838

Users enter queries that are short as well as long. The aim of this work is to evaluate techniques that can enable information retrieval (IR) systems to automatically adapt to perform better on such queries. By adaptation we refer to (1) modifications to the queries via user interaction, and (2) detecting that the original query is not a good candidate for modification. We show that the former has the potential to improve mean average precision (MAP) of long and short queries by 40% and 30% respectively, and that simple user interaction can help towards this goal. We observed that after inspecting the options presented to them, users frequently did not select any. We present techniques in this paper to determine beforehand the utility of user interaction to avoid this waste of time and effort. We show that our techniques can provide IR systems with the ability to detect and avoid interaction for unpromising queries without a significant drop in overall performance.  相似文献   

数据库查询优化提高网站访问速度     

邱小玲 《科技广场》2008,(3):79-80

数据库是网站非常重要的一部分,数据库因素的好坏直接影响网站的性能。本文主要论述了网站应用中数据库查询优化的必要性,并提出一些查询优化的策略,作为提高网站访问速度数据库技术方面的参考。  相似文献   

物化视图在查询分析中的应用     

王时绘  陈俊 《科技广场》2010,(3):169-171

本文对物化视图的基本概念、使用方法及优缺点做了概要介绍,结合本人在贵州地税综合应用平台系统开发过程中物化视图的实际应用做了详细说明。  相似文献   

The influence of personalization on tag query length in social media search     

M. Clements  A.P. de Vries  M.J.T. Reinders 《Information processing & management》2010

Social content systems contain enormous collections of unstructured user-generated content, annotated by the collaborative effort of regular Internet users. Tag-clouds have become popular interfaces that allow users to query the database of these systems by clicking relevant terms. However, these single click queries are often not expressive enough to effectively retrieve the desired content. Users have to use multiple clicks or type longer queries to satisfy their information need.  相似文献