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从信息资源的分类看搜索引擎的优化 总被引：1，自引：0，他引：1
The traditional infon-nation resources are classified according to scientificness and practicality. However,the classification of Internet information resources pays more attention to practicality while paying equal attention to scien-tificness. This article, starting from the classification methods of the traditional information resources and Intemet informs-lion resources, discusses how to optimize the search engines in classified catalogue retrieval and multiple keyword retrieval. 相似文献
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Web数据库技术综述 总被引：7，自引：1，他引：6
Web-Database is the base of many network applications such as Web information retrieval system, Web information publishing and Electronic Commerce. This article focuses on several popular Web-Database technologies such as CGI, ISAPI, IDC, ASP and Java Applet, analyzing and comparing their structure, characteristics, advantages and disadvantages. Finally, it discusses the main structure of the Web-Database technology. 相似文献
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网络信息分类检索问题研究 总被引：4，自引：0，他引：4
This paper studies network information classification retrieval from the theory of information management. With a brief introduction to search engines, it focuses on analyzing the characteristics of network documents and their classification system. Problems in network document classification are pointed out. Suggestions such as constructing a catalog classification search engine system are made. 相似文献
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The characteristics and development ofcluster technology are briefly introduced. The requirement for cluster technolgv, the grade of availability, the advantage of cluster technology and the system structure model are discussed. Finally,the article specifies 3 data sharing models,that is,Mirror,Share Nothing and Share All. 相似文献
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中刊库检索效率及其影响因素比较分析 总被引：5，自引：0，他引：5
Based on the retrieval function of the Chinese Journal Database and the China Journal Net Bibliography and Abstract Database, the article analyzes the retrieval results of the two databases and their influence factors for the same retrieval missions. The article also discusses how to construct and evaluate a database. 相似文献
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电子商务中的安全数字签名技术 总被引：2，自引：0，他引：2
The security requirement in electronic commerce and the way to realize digital signature are introduced. A scheme of securing digital signature is discussed. Finally, the article analyzes the security problem of this scheme. 相似文献
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数字图书馆个性化信息推荐系统研究 总被引：25，自引：2，他引：25
In order to provide individual information service in digital library, it's necessary to develop a personal-ized recommender system. Based on information retrieval, information filtering and coUaborative filtering technologies, this article gives some examples of the recommender system and analyzes their key technologies. 相似文献
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《国家科学评论(英文版)》2014,(3)
<正>Measuring science is based on comparing articles to similar others.However,keyword-based groups of thematically similar articles are dominantly small.hese small sizes keep the statistical errors of comparisons high.With the growing availability of bibliographic data,such statistical errors can be reduced by merging methods of thematic grouping,citation networks and keyword 相似文献
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网络信息检索技术的智能化趋势 总被引：19，自引：0，他引：19
Beginning with an analysis of the present situation of network information retrieval techniques, this article points out the main problems existent therein. It also probes into the prospects of applying the theory and technique of artificial intelligence to network information retrieval techniques as well as its intelligence trend. 相似文献
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通过运用科学和哲学的思维,借助归纳法、逻辑推理法和内容分析法,对《数字时代情报学理论与实践——从信息服务走向知识服务》进行分析。通过对主标题关键字进行分类,借助基本的数理统计知识,对著作各章的主标题关键字进行了词频统计分析,确定了著作的核心知识领域。最终将《数字时代情报学理论与实践——从信息服务走向知识服务》一书的评价结果与业界共享。 相似文献
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基于页面链接挖掘的Web教育信息检索 总被引：2，自引：0，他引：2
教育信息检索是教育信息应用于教育科研与教育教学的关键环节，而Web页面链接挖掘是对Web页面之间的链接结构进行挖掘。本文对Web链接结构挖掘在教育信息检索方面上进行了研究，介绍了Web挖掘的概念、分类，以及HITS与Page—rank等算法，并提出了一种基于样本模式特征提取的信息检索方法。 相似文献
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基于数据挖掘的Web文本不良信息监测模型研究 总被引：1，自引：0，他引：1
本文简要介绍了不良信息的概念和分类,有针对性地分析了国内外不良信息监测的研究现状与问题,综合应用文本内容特征分析、文本分类分析等挖掘方法,构建了Web文本不良信息监测模型,提出了文本不良信息监测算法. 相似文献
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摘 要：应用型计量分析分为四类,其中主题型计量分析与评价型计量分析占主流,而预测型计量分析与资源获取型计量分析却很少.本实验以获取可计算资源为目的,从中文科技期刊数据库（重庆维普）选取了1989年到2005年的17种图书情报学核心期刊（2004版）的所有论文,利用VBA对文献的关键词进行统计分析,主要从数量分布、词长规律、增长趋势以及关键词与文章的数量关系进行了分析,并按功能对关键词进行了分类. 相似文献
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【目的】学科分类作为科学研究的框架,在科学的发展中具有重要的作用。以计量学理论为基础,以《中国图书馆分类法》自然科学领域二级类目为分析对象,利用引文数据分析学科之间的相关关系,对二级类目进行修正,希望构建适应期刊分类定位需求的合适的分类体系。【方法】基于中国科学引文数据库,借助期刊之间的耦合强度研究学科之间的相关关系。【结果】通过聚类分析的方法,建立起一个经过整合之后的改进的学科分类体系,在此基础上运用关键词识别、主题挖掘等文本挖掘方法对新构建的学科分类体系的合理性进行解释。【结论】基于期刊耦合强度的学科分类体系具有符合目前期刊发展和学科发展的特点。 相似文献
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阐述网络资源调查的重要性,介绍关键词调查法、分类调查法、链接调查法等3种主要网络调查方法,为网络资源开发利用提供参考。 相似文献
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This research has investigated the feasibility of using a distance measure, called the Bayesian distance, for automatic sequential document classification. It has been shown that by observing the variation of this distance measure as keywords are extracted sequentially from a document, the occurrence of noisy keywords may be detected. This property of the distance measure has been utilized to design a sequential classification algorithm which works in two phases. In the first phase keywords extracted from a document are partitioned into two groups—the good keyword group and the noisy keyword group. In the second phase these two groups of keywords are analyzed separately to assign primary and secondary classes to a document. The algorithm has been applied to several data bases of documents and very encouraging results have been obtained. 相似文献
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一种基于关键词的创新度评价方法 总被引：1，自引：1，他引：1
本文提出基于关键词句频度及其他因素的文献创新度评价。这是一种基于语义的评价方法,可以促进某些学科总结出自己的关键词句词频表,便于用户更好地了解某个领域的发展态势。 相似文献