共查询到20条相似文献，搜索用时 31 毫秒
1.
基于元搜索引擎的中文数据库引文分析系统 总被引：2，自引：0，他引：2
分析现有中文引文数据库的优缺点，针对其存在的问题，利用元搜索引擎的原理，提出一种改进的中文数据库引文分析系统模型，并详细论述该系统的各项功能。 相似文献
2.
3.
4.
Yunrong Li Filippo Radicchi Claudio Castellano Javier Ruiz-Castillo 《Journal of Informetrics》2013,7(3):746-755
Wide differences in publication and citation practices make impossible the direct comparison of raw citation counts across scientific disciplines. Recent research has studied new and traditional normalization procedures aimed at suppressing as much as possible these disproportions in citation numbers among scientific domains. Using the recently introduced IDCP (Inequality due to Differences in Citation Practices) method, this paper rigorously tests the performance of six cited-side normalization procedures based on the Thomson Reuters classification system consisting of 172 sub-fields. We use six yearly datasets from 1980 to 2004, with widely varying citation windows from the publication year to May 2011. The main findings are the following three. Firstly, as observed in previous research, within each year the shapes of sub-field citation distributions are strikingly similar. This paves the way for several normalization procedures to perform reasonably well in reducing the effect on citation inequality of differences in citation practices. Secondly, independently of the year of publication and the length of the citation window, the effect of such differences represents about 13% of total citation inequality. Thirdly, a recently introduced two-parameter normalization scheme outperforms the other normalization procedures over the entire period, reducing citation disproportions to a level very close to the minimum achievable given the data and the classification system. However, the traditional procedure of using sub-field mean citations as normalization factors yields also good results. 相似文献
5.
引文分析存在的问题及其原因探究 总被引：5，自引：2，他引：3
目前引文分析已成为文献计量学的主要研究内容之一,但少有对其存在的问题进行分析.本文从引文分析理论(基础理论和引用动机)的不完善,引用过程中存在的不足,引文分析方法、工具和数据库的缺陷,引文分析应用与实践(科学评价和科学交流)的局限四个方面较系统地总结引文分析存在的问题及原因.目前应该以谨慎的态度看待引文分析,对其方法和结果作客观评价,在充分了解其优缺点的基础上进行完善与发展. 相似文献
6.
7.
引文支持分析研究论纲 总被引：7，自引：0，他引：7
引文支持分析研究论纲王正兴ＡＢＳＴＲＡＣＴＴｈｅａｕｔｈｏｒｄｉｓｃｕｓｓｅｓｃｉｔａｔｉｏｎｓｕｐｐｏｒｔａｎａｌｙｓｉｓ,ｃｉｔａｔｉｏｎｓｕｐｐｏｒｔｍｏｄｅｌ,ｃｉｔａｔｉｏｎｓｕｐｐｏｒｔｒｏｌｅ,ｔｈｅｒｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｅ... 相似文献
8.
《Journal of Informetrics》2014,8(4):972-984
The distribution of cumulative citations L and contributed citations Lf to individual multiauthored papers published by selected authors working in different scientific disciplines is analyzed and discussed using Langmuir-type function: yn = y0[1 − αKn/(1 + Kn)], where yn denotes the total number of normalized cumulative citations ln* and normalized contributed citations lnf* received by individual papers of rank n, y0 is the maximum value of yn when n = 0, α ≥ 1 is an effectiveness parameter, and K is the Langmuir constant related to the dimensionless differential energy Q = ln(KNc), with Nc as the number of papers receiving citations. Relationships between the values of the Langmuir constant K of the distribution function, the number Nc of papers of an individual author receiving citations and the effectiveness parameter α of this function, obtained from analysis of the data of rank-size distributions of the authors, are investigated. It was found that: (1) the quantity KNc obtained from the real citation distribution of papers of various authors working in different disciplines is inversely proportional to (α − 1) with a proportional constant (KNc)0 < 1, (2) the relation KNc = (KNc)0/(α − 1) also holds for the citation distribution of journals published in countries of two different groups, investigated earlier (Sangwal, K. (2013). Journal of Informetrics, 7, 487–504), and (3) deviations of the real citation distribution from curves predicted by the Langmuir-type function are associated with changing activity of sources of generation of items (citations). 相似文献
9.
链接分析与引文分析的比较 总被引：13，自引：1，他引：12
网络影响因子沿用了期刊影响因子对引文分析的基本思路,但作为链接分析的指标,用于网络环境中的质量评价是不可靠的。可以根据Pagerank算法提出用于论文质量评价的Pagerank算法;可以根据引文衰减系数提出"链接衰减系数"和"平均链接时距"用于研究网页的老化规律。理想的链接分析工具应当是一种专用搜索引擎。 相似文献
10.
基于科学引文索引的中国生物学期刊竞争力评价研究 总被引：1，自引：0，他引：1
本文利用文献计量学的一些国际通行指标,分析了中国生物学期刊在国际上所处的地位及影响,提出了提升中国生物学期刊国际竞争力的对策. 相似文献
11.
In citation network analysis, complex behavior is reduced to a simple edge, namely, node A cites node B. The implicit assumption is that A is giving credit to, or acknowledging, B. It is also the case that the contributions of all citations are treated equally, even though some citations appear multiply in a text and others appear only once. In this study, we apply text-mining algorithms to a relatively large dataset (866 information science articles containing 32,496 bibliographic references) to demonstrate the differential contributions made by references. We (1) look at the placement of citations across the different sections of a journal article, and (2) identify highly cited works using two different counting methods (CountOne and CountX). We find that (1) the most highly cited works appear in the Introduction and Literature Review sections of citing papers, and (2) the citation rankings produced by CountOne and CountX differ. That is to say, counting the number of times a bibliographic reference is cited in a paper rather than treating all references the same no matter how many times they are invoked in the citing article reveals the differential contributions made by the cited works to the citing paper. 相似文献
12.
13.
14.
为解决各引文数据库的检索方法、检索结果展示方式不一、引文著录不规范等问题,解放军医学图书馆采用 NET 框架作为系统的开发平台,采用 C/S 结构模式,在生物医学引文数据库的基础上构建生物医学文献引文集成检索整合平台,实现了统一平台一站式检索、自动去重、自动分组和便捷输出规范的引文报告等个性化功能,提高了生物医学文献查引效率。 相似文献
15.
目前,越来越多的科学评价系统采用引文分析指标,但文献计量方法之于人文社会科学评价的适用性是一个需要认真研究的命题。该文通过分析人文社会科学的学科特殊性,提出了基于文献引证关系的人文社会科学论文评价新思路,尝试通过引用认同评价、引证图像评价与复合层次评价进行综合评价。 相似文献
16.
17.
以国内引用认同研究者为研究对象,借助CnkiRef、Gephi等工具,从引荐分析视角分析了国内引用认同领域的研究景象,揭示出领域经典文献、权威期刊、经典图书和研究主题分布等信息,为相关学者了解该领域的研究现状提供参考,也为丰富引文分析方法提供借鉴。 相似文献
18.
以Web of Science的艾滋病疫苗研究文献作为数据来源,利用引文分析可视化软件HistCite,找出代表艾滋病疫苗研究领域发展的重要文献,并分析文献之间引用与被引用关系和引用序列,获得引文编年图谱,梳理出艾滋病疫苗研究领域的发展规律和历史发展轨迹,为国内外相关领域的研究人员提供一定的参考。 相似文献
19.
基于期刊引用形象和期刊引用认同的期刊评价 总被引：2，自引：0，他引：2
介绍了期刊引用形象和期刊引用认同的概念;修正了Bonnevie-Nebelong选择的期刊评价指标;对现有期刊评价指标从期刊引用形象和期刊引用认同的角度进行划分;提出了新的期刊引用认同评价指标:新学科扩散指标、新学科影响指标、新即年指标、新引用刊数、新他引率;分析新指标的期刊评价意义;最后以图情领域的三种期刊进行实证分析。 相似文献
20.
In this paper, we develop a novel methodology within the IDCP measuring framework for comparing normalization procedures based on different classification systems of articles into scientific disciplines. Firstly, we discuss the properties of two rankings, based on a graphical and a numerical approach, for the comparison of any pair of normalization procedures using a single classification system for evaluation purposes. Secondly, when the normalization procedures are based on two different classification systems, we introduce two new rankings following the graphical and the numerical approaches. Each ranking is based on a double test that assesses the two normalization procedures in terms of the two classification systems on which they depend. Thirdly, we also compare the two normalization procedures using a third, independent classification system for evaluation purposes. In the empirical part of the paper we use: (i) a classification system consisting of 219 sub-fields identified with the Web of Science subject-categories; an aggregate classification system consisting of 19 broad fields, as well as a systematic and a random assignment of articles to sub-fields with the aim of maximizing or minimizing differences across sub-fields; (ii) four normalization procedures that use the field or sub-field mean citations of the above four classification systems as normalization factors; and (iii) a large dataset, indexed by Thomson Reuters, in which 4.4 million articles published in 1998–2003 with a five-year citation window are assigned to sub-fields using a fractional approach. The substantive results concerning the comparison of the four normalization procedures indicate that the methodology can be useful in practice. 相似文献