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共被引网络中介中心性的Zipf-Pareto分布研究 总被引：4，自引：0，他引：4
针对共被引网络的统计特性的研究,以科学计量学领域的权威期刊《科学计量学》(Scientometrics)为数据来源,建立共被引网络,明确了《科学计量学》(Scientometrics)中高被引文献与高中心性引文的特点;以该共被引网络为例,应用复杂网络分析方法,分析了共被引网络的统计特性,包括度分布、中介中心性的分布等。结果表明共被引网络是一个具有小世界、无标度特性的复杂网络;中介中心性的分布符合Zipf-Pareto分布;而且只有少部分引文节点具有高中介中心性的值,多数引文节点的中介中心性值都很小。 相似文献
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J. Paige Pope Craig R. Hall 《Measurement in physical education and exercise science》2014,18(4):286-298
This study was designed to examine select psychometric properties of the Coach Identity Prominence Scale (CIPS), including the reliability, factorial validity, convergent validity, discriminant validity, and predictive validity. Coaches (N = 338) who averaged 37 (SD = 12.27) years of age, had a mean of 13 (SD = 9.90) years of coaching experience, and were currently coaching 46 different sports, served as the participants in this study. Participants completed a questionnaire that included four sections: Demographics, identity prominence (CIPS; Pope & Hall, 2014), motivation (Coach Motivation Questionnaire [CMQ]; McLean, Mallet, & Newcombe, 2012), and passion (The Passion Scale; Vallerand et al., 2003). The findings provided support for the various types of reliability and validity tested in the present study, with only partial support for discriminant validity. The CIPS may therefore serve as a viable option for researchers interested in further understanding the identity or psychological processes of coach. 相似文献
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北京文化的意义首先就是它长期作为中国文化中心的"首善"之意义,而巴蜀文化的"外围"意义则体现在它往往承栽了诸多与文化中心及主流文化大异其趣的成分。"中心"与"外围"的文化的差异正好提供了不同区域间彼此参照、自我反思的机会。在全球化与现代化的时代,如何突破"文化金字塔"的传统结构,让"中心"与"外围"建立更密切的互动关系,这应该是中国文化发展必须思考的重要问题。 相似文献
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围绕科研团队如何创造更多的知识,本文采用社会网络理论,构建了一个合作网的结构与关系强度的交互模型。通过收集5年间111个科研团队的合作网数据,包括862位学者与591篇论文的完整信息,采用社会网络及负二项回归等分析方法对相关假设进行了检验。结果发现:1)网络中心性对团队知识创造绩效有正向促进作用。2)网络密度负向调节网络中心性与知识创造绩效间的关系。3)关系强度进一步调节网络中心性与网络密度的交互作用。总体而言,当科研团队合作网络中心性高,网络密度小,成员间关系强时,科研团队的知识创造更高。 相似文献
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《Journal of Informetrics》2020,14(1):101005
Despite the increasing use of citation-based metrics for research evaluation purposes, we do not know yet which metrics best deliver on their promise to gauge the significance of a scientific paper or a patent. We assess 17 network-based metrics by their ability to identify milestone papers and patents in three large citation datasets. We find that traditional information-retrieval evaluation metrics are strongly affected by the interplay between the age distribution of the milestone items and age biases of the evaluated metrics. Outcomes of these metrics are therefore not representative of the metrics’ ranking ability. We argue in favor of a modified evaluation procedure that explicitly penalizes biased metrics and allows us to reveal metrics’ performance patterns that are consistent across the datasets. PageRank and LeaderRank turn out to be the best-performing ranking metrics when their age bias is suppressed by a simple transformation of the scores that they produce, whereas other popular metrics, including citation count, HITS and Collective Influence, produce significantly worse ranking results. 相似文献
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We present Biased LexRank, a method for semi-supervised passage retrieval in the context of question answering. We represent a text as a graph of passages linked based on their pairwise lexical similarity. We use traditional passage retrieval techniques to identify passages that are likely to be relevant to a user’s natural language question. We then perform a random walk on the lexical similarity graph in order to recursively retrieve additional passages that are similar to other relevant passages. We present results on several benchmarks that show the applicability of our work to question answering and topic-focused text summarization. 相似文献
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本文将知识特征解构为知识离散特征与知识关系特征，依据社会网络理论和搜索重组理论，研究二模网条件下发明人知识离散特征对其合作网络中心性的影响以及行业技术环境下知识关系特征的调节作用，并运用中国上市医药企业2004—2016年专利数据和负二项回归模型验证相关假设。研究发现：二模网中发明人知识多样性可以显著提升其合作网络中心性，使发明人处于核心位置，行业知识组合潜力负向调节上述关系；二模网中发明人知识独特性会降低其合作网络中心性，使发明人处于边缘位置，行业知识组合潜力正向调节上述关系。研究结论为发明人如何选择合作伙伴及在研发合作中采取更有针对性的整合措施促进知识转移、提升合作网络中心性提供了一定的理论依据。 相似文献
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考虑到农林类高校在农业科研与农业创新技术研发方面所发挥的举足轻重的作用，本文以国内41所农林类高校2005-2016年发明类专利申请数据为样本，在构造其合作网络和知识网络的基础上，深入探讨了这两个网络的结构洞和度中心性属性对高校创新绩效的影响。研究结果表明：在合作网络中，申请人的结构洞和度中心性都与高校创新绩效具有显著的倒U形关系，申请人的度中心性与结构洞平方项的交互作用对农林类高校创新绩效具有显著的负向调节作用，申请人的结构洞与度中心性平方项的交互作用对高校创新绩效具有显著的正向调节作用；在知识网络中，知识元素的结构洞和度中心性都与高校创新绩效具有显著的倒U形关系，知识元素的度中心性与结构洞二次方的交互作用对高校绩效创新具有显著的负向调节作用。 相似文献