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1.
首先介绍了BDSIRS全文信息检索系统所使用的两种联机检索方式外,又尝试了一种新的联机检索方式。即通过因特网的链路,结合BDSIRS专用检索软件联机检索的方式。结果证明是切实可行的,而且是一条降低费用的有效途径。接着对其全文检索方法、技术进行了探讨,从中得到的检索技巧亦有一定的实用价值。  相似文献   

2.
<正> 本文分析了影响国际联机检索费用的主要因素,提出了适合国际联机检索课题的类型,指出了选择终端和培养代查人员的重要性,探讨了费用约束下的联机策略结构.一影响费用的主要因素国际联机检索费用通常由占机时费、打印费、通讯费、终端管理费四部分组成.1.占机时费.①系统接通费.25美元/小时.高速终端约0.002-0.009小时,费用约0.05-  相似文献   

3.
因特网对光盘和联机检索的挑战   总被引:8,自引:0,他引:8  
因特网近年来的飞速发展,直接或间接地影响了光盘检索和联机检索.本文从因特网的普及性、多样性和低费用等几个方面,论述了其对光盘检索和联机检索的挑战.  相似文献   

4.
文章介绍了在DIALOG联机检索系统中检索专利文献时如何降低检索费用的技巧,以节约用户的费用.  相似文献   

5.
论文分析了联机检索系统中的知识产权信息检索方式,并对比研究了互联网信息检索与联机检索的联系与区别,免费检索和收费检索的相互关系,提出了联机检索与互联网检索、免费检索与收费检索的相互融合、相互促进的发展趋势。  相似文献   

6.
由于检索费用较高,尤其是化学结构式的检索比较复杂,因此国际联机检索在化学文献检索方面的应用受到极大的限制.本文在对STN国际联机检索系统中几个主要的化学数据库进行比较与分析的基础上,结合实际问题对化学文献的检索方法进行了比较与研究.  相似文献   

7.
数据库光盘与地方情报所万方数据公司总工程师包锦章CD—ROM数据库光盘是继联机检索系统之后出现的又一种快速而便捷的检索工具,它和联机检索的主要区别是,用户在开展检索、查找所需信息时,不受通信费和机时费的限制,从而大大降低了检索费用,受到用户欢迎。像世...  相似文献   

8.
陆建平 《情报学报》1999,18(4):296-302
本文主要探讨世界上最大的联机情报检索系统 D I A L O G 的 Dial Unit 收费新政策及其检索新策略。首先介绍了 Dial Unit 收费政策,包括 Dial Unit 是什么、如何计算其数量及费用。然后,针对这一收费新政策,提出了一系列检索新策略,包括注意事项、与系统的连接、数据库的选用、检索式的编制及输出选项等,旨在降低联机检索的费用,提高检索的效益。  相似文献   

9.
由于检索费用较高,尤其是化学结构式的检索比较复杂,因此国际联机检索在化学文献检索方面的应用受到极大的限制。本文在对STN国际联机检索系统中几个主要的化学数据库进行比较与分析的基础上,结合实际问题对化学文献的检索方法进行了比较与研究。  相似文献   

10.
OCLC 电子期刊馆藏联机与OCLC 第一检索的整合使OCLC 电子期刊服务功能增强。文中介绍了OCLC 电子期刊馆藏联机的特色, 访问, 检索与浏览, 管理, 费用控制, 订购, 用户支持等方面的运作。  相似文献   

11.
This article critically examines four Google search products (Google Advanced Search, Google News Advanced Search, Google Books Advanced Search, and Google Advanced Scholar Search) and shows how each uses metadata to enhance or improve search results. In addition, the article shows how metadata can increase search precision and recall in information discovery systems. From a library perspective, this article analyzes some of the metadata-enabled features of Google's advanced search pages and compares these features to those found in a typical online library catalog. From a serials perspective, Google News Advanced Search demonstrates how Google indexes news websites, sites that are essentially continuing resources. As Google incorporates more and more metadata functionality into its advanced search pages, they increasingly begin to function more like online library catalogs and less like search pages found in a traditional Internet search engine. The simple search box has many limitations, and like libraries, Google is increasingly creating and offering metadata-enabled search features that improve search precision and recall in its products.  相似文献   

12.
搜索引擎关键词和目录检索系统合并提高检索效率   总被引:3,自引:1,他引:2  
基于关键词搜索引擎和目录搜索引擎存在的不足,提出使两个搜索系统合并,开发网络书目控制搜索引擎的方案,提出构建纵横交错的网络信息知识链接地图的新观点,并例证说明关键词和目录检索系统合并如何提高检索效率。  相似文献   

13.
一体化医学语言系统在搜索引擎中的应用研究   总被引:2,自引:0,他引:2  
目的 :通过比较一体化医学语言系统 (下文简称UMLS)对搜索引擎检索结果的影响 ,探讨UMLS能否提高搜索引擎检索效率。方法 :选取 3组不同类型的医学提问词 ,设计 3个测试 ,比较UMLS对医学和通用搜索引擎及文献检索软件检出记录数的影响。结果 :经UMLS转换提问词后 ,3个测试中 3组不同类型提问词检出记录数均有增加 ,经统计学处理有显著差异。结论 :UMLS能提高医学和通用搜索引擎及文献检索软件的检索效率。但UMLS在搜索引擎中的应用尚处于起步阶段 ,有待进一步的研究与开发  相似文献   

14.
Evaluation of a program to teach health professionals to search MEDLINE   总被引:1,自引:0,他引:1  
This study analyzes the search behavior of end users who had taken a class in searching MEDLINE on the National Library of Medicine's MEDLARS system. Of the class alumni, 58% obtained passwords. Most of these were still conducting their own searches twelve to eighteen months later. Telephone interviews and search observations indicated that these end users were satisfied with their results and felt they had mastered the basic mechanics of searching. However, appropriate use of explodes and subheadings, as well as locating appropriate search terms, still presented difficulties for them. Further training in these areas may be required.  相似文献   

15.
Abstract

This study aims to investigate the perception of faculty members at King Abdulaziz University (KAAU) towards online search service in the Jeddah main campus. Survey methods were used to determine the demands of the faculty members from different faculties and to find out the subject areas for which more search requests are made. The data for this study were collected by administering a specially designed questionnaire to all the chairmen of departments within each faculty. Personal interviews were conducted with the library staff responsible for the online search service at the KAAU Central Library. Analysis of relevant data indicates that out of 73 questionnaires delivered to chairmen, 51 completed questionnaires were received, a 70% response rate. Further analysis revealed that 139 requests were made by 11 faculties and institutions during 1989 and 1990. Forty-five percent of respondents used online search service to conduct personal research.  相似文献   

16.
通过对现有少儿搜索引擎和广州少年儿童图书馆读者群的调查,显示当前国内少儿搜索引擎存在数量上和质量上的问题,提出投入一定的人力、物力和财力来专门分析、研究并开发适合少儿的搜索引擎,过滤不良信息,优化网络环境,已经是亟需引起家庭、学校和社会共同关注的事情的结论。  相似文献   

17.
谈搜索引擎中Web页面标引关键词的确定   总被引:2,自引:0,他引:2  
论述搜索引擎在对网络信息进行关键词标引时,传统加权词频统计算法的应用和影响关键词权重的几种因素,指出使用后控制词表是改善关键词语言性能的有效措施,最后提出一种新型的、基于逻辑“非”运算的后控制词表,用以提高搜索引擎的检准率。  相似文献   

18.
充分发挥高校科技查新咨询的情报评价作用   总被引:7,自引:0,他引:7  
科技查新是为辅助科技评估和同行专家评议提供客观文献信息依据的一项新型的科技信息咨询服务业务.本文在分析科技查新咨询中以科技查新报告进行定性情报评价、以查新课题相关论文进行定量情报评价的基础上,建议高校拓展定题情报服务、专题情报服务、竞争情报服务等多层次系列化情报增值服务,以充分发挥高校科技查新咨询的情报评价作用.参考文献8.  相似文献   

19.
Background:Systematic reviews are comprehensive, robust, inclusive, transparent, and reproducible when bringing together the evidence to answer a research question. Various guidelines provide recommendations on the expertise required to conduct a systematic review, where and how to search for literature, and what should be reported in the published review. However, the finer details of the search results are not typically reported to allow the search methods or search efficiency to be evaluated.Case Presentation:This case study presents a search summary table, containing the details of which databases were searched, which supplementary search methods were used, and where the included articles were found. It was developed and published alongside a recent systematic review. This simple format can be used in future systematic reviews to improve search results reporting.Conclusions:Publishing a search summary table in all systematic reviews would add to the growing evidence base about information retrieval, which would help in determining which databases to search for which type of review (in terms of either topic or scope), what supplementary search methods are most effective, what type of literature is being included, and where it is found. It would also provide evidence for future searching and search methods research.  相似文献   

20.
WWW访问Foxpro数据库的几种途径   总被引:1,自引:0,他引:1  
Foxpro 数据库是国内较流行的数据库平台, 它们上网的关健在于与WWW 的接口程序的设计, 本文以东南大学学位论文数据库为例, 介绍了基于WindowsNT4. 0 平台下几种有效的实现WWW 访问Foxpro 数据库的途径, 并比较了几种方式的优劣。  相似文献   

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