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深网的概念、规模及内容 总被引：9，自引：0，他引：9
张芨秋 《中国科技资源导刊 (中国信息导报)》2004,(11):57-60
通常,人们查询网络信息时最先想到的,是在某一搜索引擎中输入待查询内容的一个或几个关键词,然后在命中记录中选取自己需要的信息.如果命中记录数为零,人们通常会使用更多的关键词,或者使用同义词、近义词来深化检索.若仍没有结果,人们可能就会认为所需信息在网上并不存在,继而放弃查询.但事实可能并非如此.人们所需的信息在网上可能是大量存在的,只是传统的搜索引擎无法或者没有索引这些信息而已.记录这些信息的网页就是通常所指的深网,或称隐形网、隐蔽网. 相似文献
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网络时代带来了信息革命,中医药信息的网络共享方式则带来了科学研究手段的巨大变革.本文探讨了中医药网上信息资源的现状,研究了中医药网络信息查询的基本策略和方法,并提出了如何对网络信息加以整理和利用,以此为中医药科学研究提供一些参考. 相似文献
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网络信息半衰期测度的探索性研究 总被引：1，自引：0，他引：1
借鉴文献计量学"半衰期"的概念,提出测度网络信息效用衰减的两个指标HL<,out>和HL<,in>,并以中国和OECD确定的24个发达国家的网络信息为样本进行实证研究.研究数据表明,HLout的测定方法和结果更理想,该指标对网络信息的质量和效用评价具有一定的参考价值.图1.表2.参考文献6. 相似文献
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目的：评价不同级别团队科研人员的信息查询行为特征和差异.方法：采用自行研制的科研人员信息查询行为量表,调查所在学校承担国家级、省级、厅级、局级4个层面科研项目的36个团队218名科研人员的信息查询行为,并比较分析其信息查询行为特征和差异.结果：团队中不同性别、不同学历、不同职称科研人员的信息查询行为均存在显著差异,高职称的科研人员对信息查询行为最强;承担国家级科研项目的团队科研人员的信息查询行为最优.结论：应针对项目团队科研人员的信息查询行为水平,提高、增强科研人员的信息协作能力和信息素养,为其构建良好的信息资源环境. 相似文献
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如何快速查找Internet网上资源 总被引：8，自引：0，他引：8
Internet上的各类信息资源在以惊人的速度增长,如何从其网上快速查找资源,已成为人们在网络环境下急需掌握的一项技能.介绍了有关网络查询的一些工具,还介绍了网上一些主要信息资源的地址、特点及服务方式,并提出了检索时要注意的几个问题. 相似文献
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搜索引擎中信息存储结构的改进 总被引：3，自引：0，他引：3
网络已经成为世界上最大的数字图书馆。目前网上信息数量仍在急剧膨胀 ,无用信息所占比例愈来愈大 ,而且网络传输速度较慢 ,由于数据的存储结构直接影响着查询质量和查询速度 ,因此网络信息的存储方式亟需改进。本文针对网络信息固有的特点提出一种新的文档存储结构 ,改进了搜索引擎的性能。主要内容包括信息的自动分类 ,网页相关度的计算 ,垃圾信息以及重复信息的过滤等技术 相似文献
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所谓网络出版就是指运用Internet网络进行出版工作,包括通过网络进行出版的写作、编辑和最后出版;网上进行出版社的信息宣传;网上销售(订购);网上互动的交流和查询;电子图书的出版等。它能够实现利用Internet先传递后印刷,在每一个网络的终端,只要连接相应的设备就可以检索到想要的出版物,然后根据需要再下载和打印出来。它与传统的出版相比不同的地方在于如下几个方面: 相似文献
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丁一 《现代图书情报技术》2005,21(6):26-29
Web 信息检索（Information Retrieval）技术研究是应用文本检索研究的成果，它结合Web图论的思想，研究Web上的信息检索，是行之有效的Web知识发现的途径。传统HITS方法所获得的信息精确度相当低，而PageRank作为一通用的搜索方法，不能够应用于特定主题的信息获取。在充分分析了PageRank、HITS等现有算法和Web文档的相似度计算方法的基础上，提出了Web上查询特定主题相关信息发现的RG-HITS算法。它结合了Web超链接、网页知识表示的信息相关度以及HITS方法来搜索Web上特定主题的相关知识。 相似文献
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基于关键字匹配的搜索引擎排序网页时仅仅考虑评价网页的重要性,而忽视分类;基于分类目录的搜索引擎很难动态分析Web信息。本文在分析它们不足的前提下,提出利用模糊聚类的方法对搜索引擎的检索结果进行动态分类,依据超链分析算法PageRank和Web文档隶属度相结合进行分类排序,并给出具有调节值的结合公式。实验证明,该算法能够更有效地满足用户的需要,提高检索效率。 相似文献
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Atlas MC 《Medical reference services quarterly》2001,20(1):11-25
Physicians are becoming aware of the World Wide Web as a resource for medical information. In spring 1999, first-year students at the University of Louisville's School of Medicine were given an assignment to review and evaluate Internet search engines and directories, medicine-specific search engines and meta lists, and health-related Web sites. Students found that general search engines were easier to learn and use and produced better results than either meta medical sites or medicine-specific search engines. Students were very severe in judging the quality of health-related Web sites. Our students' impressions are compared to those of physicians in similar studies. Solutions to the problems of searching the Web for health information are reviewed. 相似文献
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郭少友 《现代图书情报技术》2010,26(2):24-30
在现有相关研究的基础上,对基于通用搜索引擎的深层网络表面化方法的基本原理进行分析,对表单域取值范围的确定、查询处理、查询结果的超链接设置等与深层网络表面化相关的若干关键问题进行探讨。 相似文献
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This paper examines the way in which Taiwan is connected to on the World Wide Web in South Korea. The Web may represent a new channel for the communication among a global society's members and a reflection of international relations. Thus, it is necessary to explore the distribution of relations formed and maintained on the Web and the contents of those relations as well. This paper traced South Korean Web pages hyperlinking pages hosted in Taiwan, using a search engine. The context in which Taiwan appears in South Korean pages was also examined. Specifically, the structure of hyperlink connectivity from South Korea and Taiwan was analyzed. It was found that the hyperlink network was very sparsely connected in terms of the number of South Korean Web pages hyperlinking to the pages of the other country. The contents of hyperlink-connected information were categorized and analyzed. The most often occurring content category was ‘Computers & Internet’ in Taiwan. This suggests that South Korean Web users including organizations are more interested in computer-related products in Taiwan than any other things. The implication of this paper is to examine the state and form of international information flow from South Korea to Taiwan based on the patterns of hyperlink relations inscribed on South Korean Web pages and the type and content of information. 相似文献
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应用正则式抽取Google网页内容 总被引：3，自引：0，他引：3
正确、完整地抽取搜索网页的内容，是对检索到的信息进行处理的基本前提。本文分析了Google网页的结构特征，给出了一组匹配Google网页内容的正则式，并用Visual C# 实现了一个内容抽取器。对多个Google网页的实际应用表明，本文提出的正则式匹配方法可以抽取Google网页的全部主要内容。 相似文献
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《Journal of Web Librarianship》2013,7(4):525-547
ABSTRACT Search engine use is one of the most popular online activities. According to a recent OCLC report, nearly all students start their electronic research using a search engine instead of the library Web site. Instead of viewing search engines as competition, however, librarians at Binghamton University Libraries decided to employ search engine optimization strategies to make their Web site more visible on the search engine result pages. Although search engine optimization is used frequently by commercial Web sites, few libraries have attempted to optimize their own sites. This article describes Binghamton University's experiences in developing and implementing an optimization pilot project. The research presented in this article has importance for libraries who may be considering an optimization project for their own sites. 相似文献
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《Library & information science research》2005,27(2):203-221
Transaction logs of NAVER, a major Korean Web search engine, were analyzed to track the information-seeking behavior of Korean Web users. These transaction logs include more than 40 million queries collected over 1 week. This study examines current transaction log analysis methodologies and proposes a method for log cleaning, session definition, and query classification. A term definition method which is necessary for Korean transaction log analysis is also discussed. The results of this study show that users behave in a simple way: they type in short queries with a few query terms, seldom use advanced features, and view few results' pages. Users also behave in a passive way: they seldom change search environments set by the system. It is of interest that users tend to change their queries totally rather than adding or deleting terms to modify the previous queries. The results of this study might contribute to the development of more efficient and effective Web search engines and services. 相似文献
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《College & Undergraduate Libraries》2013,20(1):75-84
Abstract Despite major, ongoing changes in the profession and in library school curricula, the basic principles of librarianship can and should always be applied, regardless of medium or situation. However, patrons have changed the ways they prefer to search for and access information. This means that librarians must both update their understanding of these principles and find ways to apply them more proactively. One effective response is to design and market library Web pages as preferred gateways to electronic information and instruction. Librarians can transform Web pages into “one-stop-shopping information portals” for users, providing not only information, but also instruction in how to find and evaluate information. Applying Ranganathan's Five Laws of Library Science to Web page designis a useful way to determine iflibrarians are providing the kind of Web pages their patrons need. 相似文献