Dictionary-based text categorization of chemical web pages     

Chun-Yan Liang  Li GuoZhao-Jie Xia  Feng-Guang NieXiao-Xia Li  Liang SuZhang-Yuan Yang 《Information processing & management》2006

A new dictionary-based text categorization approach is proposed to classify the chemical web pages efficiently. Using a chemistry dictionary, the approach can extract chemistry-related information more exactly from web pages. After automatic segmentation on the documents to find dictionary terms for document expansion, the approach adopts latent semantic indexing (LSI) to produce the final document vectors, and the relevant categories are finally assigned to the test document by using the k-NN text categorization algorithm. The effects of the characteristics of chemistry dictionary and test collection on the categorization efficiency are discussed in this paper, and a new voting method is also introduced to improve the categorization performance further based on the collection characteristics. The experimental results show that the proposed approach has the superior performance to the traditional categorization method and is applicable to the classification of chemical web pages.  相似文献   

试论引文在自动标引中的应用     

曾洪京 《情报杂志》1993,12(4):58-61

评介了60年代以来比较著名的几种引文标引理论,并在此基础上提出了“无标引的引文检索”方法。作者利用该方法的基本原理进行了局部试验,结果显示良好。认为如果将引文标引检索与主题标引检索结合起来,可更好地提高情报检索效率。  相似文献   

浅析维普数据库的特色与利用     

陈湘 《现代情报》2007,27(10):119-120

本文分析了维普数据库在标引、检索与利用上的特点，并提出了相应对策。  相似文献   

网络信息资源组织方法综述   总被引：11，自引：1，他引：11  

胡冰 《情报科学》2003,21(4):434-437

网络时代的到来使传统信息资源组织方法面临挑战，本文从网络信息资源组织方法角度出发，对国内学者有关该问题的研究情报作出综述。  相似文献   

Automatic indexing of online health resources for a French quality controlled gateway     

Aurélie Névéol  Alexandrina Rogozan  Stéfan Darmoni 《Information processing & management》2006

The profusion of online resources calls for tools and methods to help Internet users find precisely what they are looking for. Quality controlled gateway CISMeF provides such services for health resources. However, the human cost of maintaining and updating the catalogue are increasingly high. This paper presents the automatic indexing system currently developed in the CISMeF team to be used as such for preliminary indexing, or after human reviewing for the final indexing. The system architecture, using the INTEX platform for MeSH term extraction is detailed. The results of a first evaluation tend to indicate that the automatic indexing strategy is relevant, as it achieves a precision comparable to that of other existing operational systems. Moreover, the system presented in this paper retrieves keyword/qualifier pairs as opposed to single terms, therefore providing a significantly more precise indexing. Further development and tests will be carried out in order to improve the coverage of the dictionaries, and validate the efficiency of the system in the indexers’ everyday work.  相似文献   

自然语言检索的实现及其关键问题   总被引：1，自引：0，他引：1  

耿骞  赖茂生 《情报科学》2007,25(5):733-741

在网络环境下，非专业人员的网络信息检索活动的比重大幅度提高，而这些用户大多没有经过检索培训，没有使用检索词构造提问式、制定检索策略的经验，这样，自然语言检索技术的研究与应用日益受到信息检索界的高度重视。自然语言检索包括自然语言标引和自然语言提问处理两方面的内容，自然语言检索的关键问题基本是围绕这两个方面的，这些问题包括面向自然语言检索的标引技术、自然语言提问分析与处理、自然语言检索的匹配过程及概念控制等问题。本文介绍了自然语言检索的研究情况，讨论了自然语言检索的相关问题。  相似文献   

情报科学中的符号语言学     

王知津  黄欣 《情报理论与实践》2003,26(4):294-299

The paper argues that the theory that opens out the nature of subject indexing process is required, if the process consists of a tremor of steps and elements and it is a range of interpretations, too. The paper points out that Peirce' s semiotics is the theory by which we may study and understand the lmture of interpretation in subject indexing pro-cess. In recent years, there is a great interest in semiofcs in library and information science field. The paper discusses some basic issues of semiotics and its use in information science.  相似文献   

基于本体的文本信息检索研究   总被引：5，自引：0，他引：5  

杨建林 《情报理论与实践》2006,29(5):598-601

本文对如何构建基于本体的文本信息检索系统进行了探讨．并认为，利用反映概念之间关系的领域本体指导主题标引，利用反映实体之间关系的领域本体指导实体关系标引，并以本体的形式表示文档替代物和查询表达式，可以进一步提高文本信息检索系统的性能。  相似文献   

西文文献数据库的局限性与进一步的思考     

曹希平 《情报科学》1991,12(3):50-53,58

本文以检索这一环节为解剖点,通过对大量实例的调研,分析了一个西文文献型数据库的标引等各环节的缺陷及它们造成的总体局限性,并就数据库建设提出了建议。  相似文献   

因特网经济学未登录词计算机辅助挖掘试验   总被引：2，自引：0，他引：2  

罗宇辉  侯汉清 《情报理论与实践》2005,28(5):478-481

近年来随着社会经济科技和因特网的迅速发展,文献中不断涌现出大量未登录词。未登录词的存在严重影响了汉语自动分词与自动标引的准确率和速率。本文对1000篇经济类网页的关键部位———题名、摘要、关键词、首段进行未登录词挖掘试验,侧重对未登录词挖掘步骤设计和处理方法的讨论。  相似文献