引文索引中标引词规范的研究与实践

数据质量控制是数据库建设中的重要环节, 同样地, 在引文索引中标引词的质量也非常重要。本文作者首先分析了引文索引标引词项出现的各种问题, 在此基础上进行了一些研究, 并在《中文社会科学引文索引》(CSSCI) 的研制过程中通过计算机得到了具体实践。     

个性化信息服务中的内容过滤技术研究

本文通过资源的表达、用户兴趣文件的表达和匹配技术来研究矢量空间模型表示法和概．率模型表示法,提出了一个改进的概率模型表示法,它能够更好的满足用户的需求。     

国际图书情报领域“科学数据”研究进展述评——基于SCI/SSCI期刊论文的内容分析

[目的/意义]利用词频分析法和内容分析法定量分析国际图书情报领域"科学数据"相关研究进展。[方法/过程]本文利用Web of Science数据库通过词频分析法和内容分析法揭示了2004-2018年国际图情领域"科学数据"相关研究文献的研究主题领域和研究方法类型,分析了国外相关研究的主题分布特点与研究方法特色,并在此基础上指出了对我国相关研究的借鉴与启示。[结果/结论]国外相关研究更多关注应用研究相关主题领域,广泛采用多种类型的研究方法进行实证研究,并注重借鉴、移植多学科方法进行创新性应用。     

《图书情报工作》论文关键词及分类号的统计分析

运用文献计量学方法,统计2001-2003年《图书情报工作》论文关键词及分类号,并对其数量、内容、标引质量等进行研究分析。结果显示,该刊关键词和分类号的标引质量较高,但还有不足之处。希望广大论文作者和编辑人员共同努力,进一步提高科技论文的标引质量。     

Preliminary findings of Active Classrooms: An intervention to increase physical activity levels of primary school children during class time

This study evaluates the effects of a behaviour change intervention, which encourages the integration of physical activity into the teaching of academic lessons, on physical activity levels of students. The main outcome is mean minutes of moderate-to-vigorous physical activity (MVPA) daily generated during the intervention lessons. Teacher's perceptions and students' enjoyment of the programme were also evaluated. Students accumulated a mean of 8 min MVPA during the intervention lessons daily. The teacher and students were very satisfied with the programme. Therefore, changing teacher behaviour towards using physically active teaching methods is a promising way of increasing children's physical activity levels.     

Compression of double array structures for fixed length keywords

A trie is one of the data structures for keyword matching. It is used in natural language processing, IP address routing, and so on. It is represented by the matrix form, the link form, the double array, and LOUDS. The double array representation combines retrieval speed of the matrix form with compactness of the list form. LOUDS is a succinct data structure using bit-string. Retrieval speed of LOUDS is not faster than that of the double array, but its space usage is smaller. This paper proposes a compressed version of the double array by dividing the trie into multiple levels and removing the BASE array from the double array. Moreover, a retrieval algorithm and a construction algorithm are proposed. According to the presented experimental results for pseudo and real data sets, the retrieval speed of the presented method is almost the same as the double array, and its space usage is compressed to 66% comparing with LOUDS for a large set of keywords with fixed length.     

P2P环境下数字图书馆系统基于语义的节点查询扩展研究

针对传统数字图书馆中基于关键字的P2P查询扩展存在对用户检索词语义信息解释不足的缺陷,本文提出一种P2P环境下基于语义的节点查询扩展方法,通过把关键字关联表和本体相结合,实现了一种个性化查询扩展方法,同时利用这种扩展方法实现P2P中基于兴趣网络的搜索,能够较大幅度提升检索效率。     

搜索引擎应用经验谈

本文就搜索引擎作了简要概述，并着重介绍了在应用过程中易出现的问题及解决方法。     

英语词汇学习策略综述

词汇在二语习得中起着重要作用。本文综述了语言学习过程中的一些词汇学习策略，如语义场策略，关键词法，上下文阅读法，单词表策略，形态理据策略等，并根据词汇学习的二个准则和中国具体的外语学习环境分别对上述策略进行了分析、比较。最后提出：在利用单词表记忆多词素词时，应使用形态理据策略，并结合上下文的学习来补充词汇知识。     

基于技术关键词的学科领域协同演化分析实证研究

[目的/意义]针对处于萌芽期的学科领域文献量不足、技术