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1.
共引分析：研究学科及其文献结构和特点的一种有效方法 总被引：12，自引：2，他引：12
利用聚类分析和多维标度技术对1987年农业科学文献进行了文章共引分析,即按被引次数及共引情况选出28篇文章作为分析对象,用多维标度技术把高维引文空间中的28个文献点以二维散点图的形式表示出来,并把这些点通过聚类分析圈成点群,根据这样的圈所提供的信息,分析讨论了农业科学及其文献的结构和特点。 相似文献
2.
Towards mapping library and information science 总被引：3，自引：1，他引：3
Frizo Janssens Jacqueline Leta Wolfgang Glnzel Bart De Moor 《Information processing & management》2006,42(6):1614
In an earlier study by the authors, full-text analysis and traditional bibliometric methods were combined to map research papers published in the journal Scientometrics. The main objective was to develop appropriate techniques of full-text analysis and to improve the efficiency of the individual methods in the mapping of science. The number of papers was, however, rather limited. In the present study, we extend the quantitative linguistic part of the previous studies to a set of five journals representing the field of Library and Information Science (LIS). Almost 1000 articles and notes published in the period 2002–2004 have been selected for this exercise. The optimum solution for clustering LIS is found for six clusters. The combination of different mapping techniques, applied to the full text of scientific publications, results in a characteristic tripod pattern. Besides two clusters in bibliometrics, one cluster in information retrieval and one containing general issues, webometrics and patent studies are identified as small but emerging clusters within LIS. The study is concluded with the analysis of cluster representations by the selected journals. 相似文献
3.
期刊同被引的实证计量研究 总被引：9，自引：0，他引：9
本文主要对1996-2006年间CNKI数据库中21种编辑出版类期刊进行了统计与分析,采用同被引聚类分析和核心一边缘模型.试图确定这一学科的核心期刊.并与2004年版的<中文核心期刊要目总览>进行比较,其结果说明期刊同被引分析方法应用于确定核心期刊是有效的. 相似文献
4.
[目的/意义]分析期刊主题分布特征有助于揭示学科领域的研究主题,掌握科学研究的整体发展态势,为寻找科研着力点提供参考。为改善已有的期刊主题研究忽略主题分布均衡性的不足,提出一种基于点度中心度及其均衡性的期刊主题分布特征分析方法。[方法/过程]以2013—2019年图书情报与档案管理学领域20种CSSCI来源期刊为例,首先,利用聚类方法对各期刊主题进行类团划分,进而计算不同主题类团的点度中心度;其次,利用Gini系数计算期刊主题类团网络中点度中心度的均衡性Gc;最后,根据期刊主题数量n和期刊主题类团点度中心度的均衡性构建"n-Gc"二维坐标,在二维坐标中展示并探讨期刊主题的分布特征。[结果/结论]实验表明,"点度中心性"与"均衡性"结合得到的期刊主题分布特征与期刊实际收录主题特点基本一致;同时,"n-Gc"二维坐标对期刊主题特征的描述粒度更小,描述结果更加全面、细致。 相似文献
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以《中国引文数据库》为统计源,采用共被引方法对我国图书馆学高频被引论文进行统计分析,透视我国图书馆学研究的主流领域。聚类分析的结果表明,我国图书馆学研究的热点主题包括:(1)数字图书馆;(2)网络信息资源研究;(3)用户服务;(4)知识管理;(5)图书馆2.0;(6)学科馆员;(7)复合图书馆;(8)信息素质教育。 相似文献
6.
基于同被引分析的我国图书馆学情报学期刊关系与结构研究 总被引：1，自引：0，他引：1
本文在选取我国图书馆学情报学领域24种典型期刊的基础上,利用期刊同被引分析方法对从CNKI中检索出的1999—2009年的期刊同被引数据进行了分析,包括聚类分析、多维尺度分析和因子分析,得出了期刊的关系与结构及其在图书馆学情报学领域中的地位。 相似文献
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旨在探究美国社会资助创新的研究计划、发展脉络及创新集群,以美国国家科学基金(NSF)数据库中奖助创新的期刊文献为研究对象,运用知识图谱文献计量方法进行基础文献统计分析。研究发现:(1)NSF奖助的研究计划主要集中于三类:中小企业发展;人工智能;新能源。(2)发展脉络顺序:发展中小企业;环境与人工智能;超算与新能源。(3)四大集群分别是:教育创新集群,系统科学创新集群,工程项目创新集群和创新训练集群。以期为我国的创新战略提供参考和启发。 相似文献
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《Information processing & management》1999,35(1):31-44
In earlier papers the authors focused on differences in the ageing of journal literature in science and the social sciences. It was shown that for several fields and topics bibliometric standard indicators based on journal articles need to be modified in order to provide valid results. In fields where monographs, books or reports are important means of scientific information, standard models of scientific communication are not reflected by journal literature alone. To identify fields where the role of non-serial literature is considerable or critical in terms of bibliometric standard methods, the totality of the bibliographic citations indexed in the 1993 annual cumulation of the SCI and SSCI databases, have been processed. The analysis is based on three indicators, the percentage of references to serials, the mean references age, and the mean reference rate. Applications of these measures at different levels of aggregation (i.e., to journals in selected science and social science fields) lead to the following conclusions. 1. The percentage of references to serials proved to be a sensitive measure to characterise typical differences in the communication behaviour between the sciences and the social sciences. 2. However, there is an overlap zone which includes fields like mathematics, technology oriented science, and some social science areas. 3. In certain social sciences part of the information seems even to be originated in non-scientific sources: references to non-serials do not always represent monographs, pre-prints or reports. Consequently, the model of information transfer from scientific literature to scientific (journal) literature assumed by standard bibliometrics requires substantial revision before valid results can be expected through its application to social science areas. 相似文献
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10.
基于知识图谱的我国期刊评价研究评述 总被引：2，自引：0，他引：2
利用新的文献可视化手段,对1998-2009年主题为期刊评价的CSSCI来源文献分析,分别绘制了作者、关键词、作者共被引、期刊共被引、文献共被引知识图谱。解读和评述了期刊评价领域的特点。h指数、CSSCI、web即年下载率等是热点话题;知识源主要集中在图书馆情报与文献学、新闻与传播学两类学科期刊;核心期刊、人文社会科学期刊、h指数等评价指标研究是期刊评价研究的三个主要知识领域。 相似文献
11.
The classification of journal titles into fields or specialties is a problem of practical importance in library and information science. An algorithm is described which accomplishes such a classification using the single-link clustering technique and a novel application of the method of bibliographic coupling. The novelty consists in the use of two-step bibliographic coupling linkages, rather than the usual one-step linkages. This modification of the similarity measure leads to a marked improvement in the performance of single-link clustering in the formation of field or specialty clusters of journals. Results of an experiment using this algorithm are reported which grouped 890 journals into 168 clusters. This scope is an improvement of nearly an order of magnitude over previous journal clustering experiments. The results are evaluated by comparison with an independently derived manual classification of the same journal set. The generally good agreement indicates that this method of journal clustering will have significant practical utility for journal classification. 相似文献
12.
网络计量学中的共链分析是一种新兴方法,也被认为是文献计量学中共引分析在网络文献的延伸。为了考察两者的实际关系,对专利技术公司和学术机构分别进行共链分析,将得到的多维尺度分析聚类图分别与专利共引和论文共引聚类图比较,得出共链分析与共引分析两种方法的相似性与差异性。同时发现,结合专利、论文、网页内容的共引与共链组合方法能够全方位地反映行业的情况,可以作为行业情报研究的有效方法之一。 相似文献
13.
当代国际科学学主流学术群体及其代表人物 总被引：8，自引：0，他引：8
运用信息可视化技术等新兴科学计量学方法,对1995年至2004年国际科学学领域论文高被引频次前50名作者进行分析,绘制出科学学主流学术群体及其代表人物的知识图谱。该图谱形象地显示出这些高影响力作者在当代国际科学学主流领域,形成了科技管理与政策、情报学与信息检索、科学知识图谱与信息可视化、网络计量学、科学社会学与科学知识社会学、科学计量学理论与科研评价等前沿分支学科的6个学术群体。成为这些前沿学科与主流群体的代表人物。他们为开创或发展当代科学学主流分支学科做出了突出贡献,产生了巨大影响,值得我国科学学界密切关注。 相似文献
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图书馆学情报学期刊的同被引研究 总被引：4，自引：0，他引：4
期刊同被引是同被引分析方法的一种,使用该方法可以对图书馆学情报学相关期刊的同被引情况进行研究.本文首先对1996-2006年CNKI中有关图书馆学情报学期刊的同被引数据进行统计,然后运用聚类分析和核心--边缘模型两种方法来处理和分析数据,最后得出相应的结论.通过对分析结果进行解释,试图说明图书馆学情报学期刊之间的关系,并确定该学科的核心期刊. 相似文献
15.
Masaki Eto 《Information processing & management》2019,56(6):102046
This study proposes a novel extended co-citation search technique, which is graph-based document retrieval on a co-citation network containing citation context information. The proposed search expands the scope of the target documents by repetitively spreading the relationship of co-citation in order to obtain relevant documents that are not identified by traditional co-citation searches. Specifically, this search technique is a combination of (a) applying a graph-based algorithm to compute the similarity score on a complicated network, and (b) incorporating co-citation contexts into the process of calculating similarity scores to reduce the negative effects of an increasing number of irrelevant documents. To evaluate the search performance of the proposed search, 10 proposed methods (five representative graph-based algorithms applied to co-citation networks weighted with/without contexts) are compared with two kinds of baselines (a traditional co-citation search with/without contexts) in information retrieval experiments based on two test collections (biomedicine and computer linguistic articles). The experiment results showed that the scores of the normalized discounted cumulative gain ([email protected]) of the proposed methods using co-citation contexts tended to be higher than those of the baselines. In addition, the combination of the random walk with restart (RWR) algorithm and the network weighted with contexts achieved the best search performance among the 10 proposed methods. Thus, it is clarified that the combination of graph-based algorithms and co-citation contexts are effective in improving the performance of co-citation search techniques, and that sole use of a graph-based algorithm is not enough to enhance search performances from the baselines. 相似文献
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基于ESI数据库的材料科学领域文献计量分析研究 总被引：8，自引：0，他引：8
通过对《基本科学指标数据库》(ESI)收录的近11年来有关材料学领域的文献进行计量研究,得出材料学领域高生产力和高被引的国家、机构、期刊以及作者的分布,并对材料学领域高被引论文和热门论文进行期刊和作者的分析;最后对高被引作者进行共被引分析,并提供了近11年来材料科学领域的主要研究主题和作者的集群分布。 相似文献
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摘要：通过绘制科学计量学研究前沿知识图谱,界定出七大国际科学计量学研究前沿领域：1、引文理论、科学交流、基础科研评价;2、科学知识图谱理论与方法、网络计量学;3、科学技术合作;4、科学计量学经典概率分布、文献计量学定律、信息计量学;5、科学计量学指标与国家科研绩效评价;6、知识的新产品--科技动力学;7、科学与技术的关系。其中前沿领域1、2、4属于理论与方法研究领域,而前沿领域3、5、6、7属于应用研究领域。经过比较发现科学计量学更加侧重于理论与方法研究。 相似文献
18.
Frizo Janssens Lin Zhang Bart De Moor Wolfgang Glnzel 《Information processing & management》2009,45(6):683-702
A hybrid text/citation-based method is used to cluster journals covered by the Web of Science database in the period 2002–2006. The objective is to use this clustering to validate and, if possible, to improve existing journal-based subject-classification schemes. Cross-citation links are determined on an item-by-paper procedure for individual papers assigned to the corresponding journal. Text mining for the textual component is based on the same principle; textual characteristics of individual papers are attributed to the journals in which they have been published. In a first step, the 22-field subject-classification scheme of the Essential Science Indicators (ESI) is evaluated and visualised. In a second step, the hybrid clustering method is applied to classify the about 8300 journals meeting the selection criteria concerning continuity, size and impact. The hybrid method proves superior to its two components when applied separately. The choice of 22 clusters also allows a direct field-to-cluster comparison, and we substantiate that the science areas resulting from cluster analysis form a more coherent structure than the “intellectual” reference scheme, the ESI subject scheme. Moreover, the textual component of the hybrid method allows labelling the clusters using cognitive characteristics, while the citation component allows visualising the cross-citation graph and determining representative journals suggested by the PageRank algorithm. Finally, the analysis of journal ‘migration’ allows the improvement of existing classification schemes on the basis of the concordance between fields and clusters. 相似文献
19.
本文回顾了<情报理论与实践>的历史发展,从间接和直接两个角度分析了该刊在情报学领域的地位和影响力.研究表明,情报学的专家、学者对其评价都很高.作为情报学领域的一本核心期刊,其地位很高、影响力很强,并仍在继续发展和进步. 相似文献
20.
基于期刊共引分析法的学科关系知识图谱的实证研究 总被引：2，自引：0，他引：2
本文基于期刊共引分析法,利用社会网络分析和Pajek软件,构建中国农史学科与相邻学科关系知识图谱,分析农业史学科与相邻学科的关系。为基于期刊共引分析的学科关系知识图谱的进一步研究提供具体的案例。 相似文献