Z39.50协议在俄罗斯的应用   总被引：2，自引：0，他引：2  

陈敏 《大学图书馆学报》2002,20(2):82-84

介绍Z39.50协议在俄罗斯的发展现状,讨论了其特色、优势以及障碍,以期对我国图书馆事业在网络环境下的发展有所启示。  相似文献   

WWW中文信息自动分类方法研究   总被引：6，自引：0，他引：6  

郑家恒  宋文中 《情报学报》2002,21(5):532-536

本文采用一种基于词的归类技术。在类别词专指度的计算中 ,考虑了类别词在语料中的频度、集中度和分布性等因素。根据HTML语言的标记特性 ,应用三维加权分类算法计算类别权值。采用Bayes公式变型 ,计算WWW中文信息文件归类可信度 ,并按可信度最大归类。对 10 8篇试语料进行测试 ,封闭测试的归类正确率为98 1% ,开放测试的正确率为 83 3%。  相似文献   

如何在局域网上实现虚拟Internet     

徐德 《宜春学院学报》2003,25(2):53-54

为了充分利用局域网，提高单位内部的工作效率，可以实现在局域网上模拟Internet功能，首先在WindowsNT服务器上安装DNS、IIS组件，然后配置WWW服务器、FTP服务器，建立邮件系统，就可以实现虚拟的Internet．  相似文献   

基于WWW技术的教学系统     

李宁  陈涛  邓海宇 《中山大学学报论丛》1997,(3)

随着信息高速公路的迅速发展，ＣＡＩ（计算机辅助教学系统）的开发研制也转向了网络化、智能化和多媒体化。本系统采用Ｉｎｔｅｒｎｅｔ的ＷＷＷ技术，如ＨＴＭＬ制作、ＣＧＩ编程、Ｊａｖａ和ＪａｖａＳｃｒｉｐｔ编程、ＧＩＦ８９ａ动画制作、ＶＲＭＬ（虚拟现实）制作等技术，实现了既可用于课堂教学，又可以用于学习者通过网络和通用的浏览器自学、复习、自测、质疑以及在网上与老师、同学对话或讨论的“模拟电子技术”课程教学系统  相似文献   

WWW检索工具比较研究   总被引：35，自引：1，他引：34  

章琳  张保明 《情报学报》1998,(4)

近年来,随着ＷＷＷ技术的广泛应用,使得Ｉｎｔｅｒｎｅｔ迅速发展。作为Ｉｎｔｅｒｎｅｔ网上的信息查找途径,ＷＷＷ检索站点已成为Ｉｎｔｅｒｎｅｔ网上最繁忙的站点之一。本文选取了Ｙａｈｏｏ、ＡｌｔａＶｉｓｔａ、Ｅｘｃｉｔｅ、ＨｏｔＢｏｔ、Ｉｎｆｏｓｅｋ、Ｌｙｃｏｓ、ＯｐｅｎＴｅｘｔ、ＷｅｂＣｒａｗｌｅｒ及ＭｅｔａＣｒａｗｌｅｒ等九个著名的ＷＷＷ检索工具,通过上网实验,分析比较各工具检索引擎的特点,并从用户角度指出检索引擎现阶段存在的问题。最后对开发我国的ＷＷＷ检索工具提出了建议  相似文献   

网络数据挖掘及其在面向Web的知识检索中的应用   总被引：6，自引：1，他引：5  

金燕  张玉峰 《现代图书情报技术》2003,(6):55-57

介绍了网络数据挖掘的含义和相关技术，并着重介绍了网络数据挖掘方法在面向Web的知识检索中的应用：通过对信息源内容与结构的挖掘，对用户访问记录的挖掘，对专家访问的挖掘，发现隐藏在网络数据流背后的知识关联和知识，形成特定知识库，支持知识检索。  相似文献   

Improvement of building field association term dictionary using passage retrieval     

Uddin Md.  Elmarhomy  Elsayed  Masao  Kazuhiro  Jun-ichi 《Information processing & management》2007,43(6):1793

Field Association (FA) terms are a limited set of discriminating terms that can specify document fields. Document fields can be decided efficiently if there are many relevant FA terms in that documents. An earlier approach built FA terms dictionary using a WWW search engine, but there were irrelevant selected FA terms in that dictionary because that approach extracted FA terms from the whole documents. This paper proposes a new approach for extracting FA terms using passage (portions of a document text) technique rather than extracting them from the whole documents. This approach extracts FA terms more accurately than the earlier approach. The proposed approach is evaluated for 38,372 articles from the large tagged corpus. According to experimental results, it turns out that by using the new approach about 24% more relevant FA terms are appending to the earlier FA term dictionary and around 32% irrelevant FA terms are deleted. Moreover, precision and recall are achieved 98% and 94% respectively using the new approach.  相似文献   

A framework for scaffolding students' assessment of the credibility of evidence     

Iolie Nicolaidou  Eleni A. Kyza  Frederiki Terzian  Andreas Hadjichambis  Dimitris Kafouris 《科学教学研究杂志》2011,48(7):711-744

Assessing the credibility of evidence in complex, socio‐scientific problems is of paramount importance. However, there is little discussion in the science education literature on this topic and on how students can be supported in developing such skills. In this article, we describe an instructional design framework, which we call the Credibility Assessment Framework, to scaffold high school students' collaborative construction of evidence‐based decisions and their assessment of the credibility of evidence. The framework was employed for the design of a web‐based reflective inquiry environment on a socio‐scientific issue, and was enacted with 11th grade students. The article describes the components of the Credibility Assessment Framework and provides the details and results of an empirical study illustrating this framework in practice. The results are presented in the form of a case study of how 11th grade students investigated and evaluated scientific data relating to the cultivation of genetically modified plants. Multiple kinds of data were collected, including pre‐ and post‐tests of students' conceptual understanding and their skills in assessing the credibility of evidence, and videotapes of students' collaborative inquiry sessions. The analysis of the pre‐ and post‐tests on students' conceptual understanding of Biotechnology and their skills in assessing the credibility of evidence revealed statistically significant learning gains. Students' work in task‐related artifacts and the analysis of two groups' videotaped discussions showed that students became sensitive to credibility criteria, questioned the sources of data and correctly identified sources of low, moderate, and high credibility. Implications for designers and educators regarding the application of this framework are discussed. © 2011 Wiley Periodicals, Inc. J Res Sci Teach 48: 711–744, 2011  相似文献   

网上中文百科全书的现状分析     

王国红  孙平 《现代图书情报技术》2003,(Z1)

考察了当前主要网上中文百科全书 ,对其内容和页面设计以及检索现状等进行了调查研究 ,并就编排方式和索引结构等与印刷形式百科全书做了对比  相似文献   

基于ASP的Web数据库组合检索功能的实现和技巧     

杨敦华  陈昕  许书扬 《现代图书情报技术》2001,17(4):46-49

介绍了用ASP 实现Web 数据库组合检索功能及图形字段的输出技巧和提高反应速度的技巧, 并给出了部分源程序。  相似文献