共查询到19条相似文献，搜索用时 171 毫秒
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SCI的引文统计指标及其与研究评价的关系 总被引：16，自引：1，他引：15
从引证类型和检索系统统计源期刊组成分析SCI的引文统计数据及相关指标与期刊和论文学术水平间的不对应关系，并从引文统计时段、论文类型和期刊大小等方面探讨影响因子本身的不确定性；通过分析中国科技期刊的被引情况指出SCI中引文数据的统计错误。认为在我国的科研成果和学术期刊评价中，一定要具体分析SCI的统计数据，适度、合理地使用引证分析方法。 相似文献
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介绍作者引用认同和作者引证形象的概念,提炼作者引用认同和作者引证形象的特征,并与传统的作者被引分析进行比较;从狭义和广义上介绍期刊引用认同和期刊引证形象的概念,构建期刊引用认同和期刊引证形象的指标体系;界定机构引用认同和机构引证形象的概念和特征;提出引用认同和引证形象的分析角度。 相似文献
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1994-2003年我国图书馆学核心期刊被引、自引、互引、影响因子和即年指标测度评价 总被引：14，自引：0，他引：14
通过对我国11种图书馆学核心期刊在1994-2003年间的被引、自引、互引、影响因子和即年指标进行统计与分析,对图书馆学核心期刊的学术质量和学术地位以及核心期刊之间的引证和被引证关系作出测度与评价。 相似文献
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首先通过对期刊以及机构评价中的标准化指标进行较深入的比较,分析在学术期刊评价中不同类型指标对评价结果有效性的理解,探寻学术期刊影响力的主要属性特征及等效测度指标。其后按照普赖斯提出的知识累积金字塔式模式,构建基于非参数统计的评价指标-分布权秩得分(分布得分),该指标按照对数法则对不同引用量区间的文献赋予不同权重,并考虑研究领域引文网络的节点中心度,选择入度中心度(被引量)衡量文献在知识传播中的位置。最后,选择核心版SCI生物学领域的46种期刊作实证分析,并将本文所构建的分布得分指标与常用的期刊评价指标做对比分析。 相似文献
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利用Google的PageRank原理进行期刊引文分析,提出期刊在引文网络中的影响力测度指标--引文网络影响力序位(Journal Impact Rank in Citation Net,Impact Rank或IR).通过对118种生物学领域的期刊进行期刊引文网络影响力测度,并将IR结果与JCR提供的影响因子(Impact Factor, IF)值进行统计学分析以考察二者的相关性和差异性.结果表明,IR值与IF值的相关性较弱,其差异性具有统计学意义.分析其原因,IR考虑了引证期刊的权重和期刊间的相互影响,更适于反映期刊在其相关学科或领域的引文网络中的相对影响力;IF值因其实质上是期刊论文篇均被引频次,其计算不考虑期刊之间的相互联系和引证期刊的权威性,因而更适用于期刊自身的纵向评价;IR与IF从两种不同角度评价期刊影响力,可互为补充. 相似文献
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[目的/意义] 从知识交流效率视角构建期刊影响力评价方法,为探索期刊影响力的多维指标评价及优化提供借鉴。[方法/过程] 运用DEA模型测算图书情报类期刊的知识交流效率,基于期刊效率的差异性与DEA方法的原理识别出期刊间的认可关系,构建认可网络并求解各节点的α中心度以表示期刊的影响力,运用期刊指标的相对强度值及其分类结果揭示期刊影响力的成因,并测算期刊知识交流的知识来源冗余率和传播及引证不足率。[结果/结论] 图书情报类期刊整体知识交流效率较高,但存在着差异性;期刊依据影响力的大小,分别位于期刊认可网络的中央、核心和边缘位置,受其他期刊的认可总数与认可程度依次递减;期刊分为学术热点、知识扩散、网络传播、国内影响、国际影响和改进型6种类型,国际影响力型的期刊较少;改进型期刊需要减少期刊知识来源冗余率和传播及引证不足率以提升期刊效率;提出提升期刊影响力的建议。 相似文献
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孙安 《大学图书情报学刊》2009,27(3):57-60
文章对我国四大引文数据库及其期刊引证报告的发展和现状做了简要总结。对这四大引文数据库极其引证报告的特色进行了比较,指出了四大引文数据库及其引证报告的不足,并提出了改进的建议与措施。 相似文献
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JCR五年期影响因子探析 总被引：6，自引：0，他引：6
使用期刊引证报告(JCR)6015种期刊数据,以统计学方法探索性地分析5年期影响因子IF5的特点.结果显示,IF5作为具有代表性的平均性期刊评价指标,能更好地反映多数期刊被引高峰,总体符合布拉德福分布.IF5与2年期影响因子IF存在排序相关,也有显著统计学差异,两者测评结果在较好和较差期刊上相对一致,但在多数水平居中的期刊上存在区别.最后,给出Ifa指数测度两种影响因子的差别和Ifb指数综合两种影响因子的评价信息. 相似文献
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对专利权人引用网络中的3种类型的媒介角色的概念、算法等进行梳理,根据媒介角色理论和知识交流理论对媒介角色是否影响专利权人技术创新能力做理论推导,并提出3个假设。通过实证分析发现,不同的角色影响程度各不相同:中介中心性对专利权人技术创新能力的影响力最大;5种桥系数小于中介中心性,影响最小的是结构洞约束。 相似文献
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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
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《Journal of Informetrics》2014,8(3):683-692
This paper explores a possible approach to a research evaluation, by calculating the renown of authors of scientific papers. The evaluation is based on the citation analysis and its results should be close to a human viewpoint. The PageRank algorithm and its modifications were used for the evaluation of various types of citation networks. Our main research question was whether better evaluation results were based directly on an author network or on a publication network. Other issues concerned, for example, the determination of weights in the author network and the distribution of publication scores among their authors. The citation networks were extracted from the computer science domain in the ISI Web of Science database. The influence of self-citations was also explored. To find the best network for a research evaluation, the outputs of PageRank were compared with lists of prestigious awards in computer science such as the Turing and Codd award, ISI Highly Cited and ACM Fellows. Our experiments proved that the best ranking of authors was obtained by using a publication citation network from which self-citations were eliminated, and by distributing the same proportional parts of the publications’ values to their authors. The ranking can be used as a criterion for the financial support of research teams, for identifying leaders of such teams, etc. 相似文献
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This study uses bibliographic coupling to identify missing relevant patent links, in order to construct a comprehensive citation network. Missing citation links can be added by taking the missing relevant patent links into account. The Pareto principle is used to determine the threshold of bibliographic coupling strength, in order to identify the missing relevant patent links. Comparisons between the original patent citation network and the comprehensive patent citation network with the missing relevant patent links are illustrated at both the patent and assignee levels. Light emitting diode (LED) illuminating technology is chosen as the case study. The relationships between the patents and the assignees are obviously enhanced after adding the missing relevant patent links. The results show that the growth rates on both the total number and the average number of links have apparently improved at the patent level. At the assignee level, the number of linked assignees and the average number of links between two assignees are increased. The differences between the two citation networks are further examined by means of the Freeman vertex betweenness centrality and Johnson's hierarchical clustering. The patents with more new links to other patents have distinct results in terms of the Freeman vertex betweenness centrality. The enhancement of links among patents also results in different clustering. 相似文献
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《Journal of Informetrics》2014,8(1):197-211
Author co-citation analysis (ACA) has long been used as an effective method for identifying the intellectual structure of a research domain, but it relies on simple co-citation counting, which does not take the citation content into consideration. The present study proposes a new method for measuring the similarity between co-cited authors by considering author's citation content. We collected the full-text journal articles in the information science domain and extracted the citing sentences to calculate their similarity distances. We compared our method with traditional ACA and found out that our approach, while displaying a similar intellectual structure for the information science domain as the other baseline methods, also provides more details about the sub-disciplines in the domain than with traditional ACA. 相似文献
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首先对我国图书馆学方法论研究作了简单的评述,然后分析引文分析法在进入21世纪以后在图书馆学研究中所起到的重要作用以及这种方法对图书馆学研究所具有的独特作用,由此认为引文分析法是图书馆学研究的一种十分重要的、名副其实的专门方法,并提出必须进一步研究引文分析法。 相似文献
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运用引文增强技术对《档案管理》的发文和被引数据进行深层关联分析,从施引学科、施引群体、施引机构、学术宣传效果等角度探讨该刊的学术影响力特征及影响因素。本研究发现该刊的学科影响力主要局限在档案学领域,施引机构多集中在高校,该刊的论文价值发现周期偏长,被错引的比例较高,且高频施引者占比较少,建议该刊扩大选题范围,积极吸纳亲缘学科的相关论文;奖励活跃贡献者,提高作者回报率;重视学术宣传工作,降低被误引的概率,从而进一步提升学术影响力。 相似文献
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In this study we map out the large-scale structure of citation networks of science journals and follow their evolution in time by using stochastic block models (SBMs). The SBM fitting procedures are principled methods that can be used to find hierarchical grouping of journals that show similar incoming and outgoing citations patterns. These methods work directly on the citation network without the need to construct auxiliary networks based on similarity of nodes. We fit the SBMs to the networks of journals we have constructed from the data set of around 630 million citations and find a variety of different types of groups, such as communities, bridges, sources, and sinks. In addition we use a recent generalization of SBMs to determine how much a manually curated classification of journals into subfields of science is related to the group structure of the journal network and how this relationship changes in time. The SBM method tries to find a network of blocks that is the best high-level representation of the network of journals, and we illustrate how these block networks (at various levels of resolution) can be used as maps of science. 相似文献
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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