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网络信息资源被链接次数的频数分布模型 被引量:3
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作者 段宇锋 《情报科学》 CSSCI 北大核心 2005年第10期1495-1498,共4页
本研究从美国研究型商学院网站出发,按照样本抽取、获取原始数据、链接分析、频数统计和模型建立的步骤,建立起完整的网络信息资源被链接次数的频数分布方法,并发现其分布符合模型^Y=10238X-1.896。该模型为国家网络信息资源的合理配置... 本研究从美国研究型商学院网站出发,按照样本抽取、获取原始数据、链接分析、频数统计和模型建立的步骤,建立起完整的网络信息资源被链接次数的频数分布方法,并发现其分布符合模型^Y=10238X-1.896。该模型为国家网络信息资源的合理配置与调控提供了理论指导和实践依据。 展开更多
关键词 频数分布模型 网络链接 网络信息资源
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Conformists and Contrarians in a Kuramoto Model with Uniformly Distributed Natural Frequencies
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作者 YUAN Di YANG Jun-Zhong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第6期684-688,共5页
A generalization of the Kuramoto model in which oscillators are coupled to the mean field with random signs is investigated in this work. We focus on a situation in which the natural frequencies of oscillators follow ... A generalization of the Kuramoto model in which oscillators are coupled to the mean field with random signs is investigated in this work. We focus on a situation in which the natural frequencies of oscillators follow a uniform probability density. By numerically simulating the model, we find that the model supports a modulated travelling wave state except for already reported 7r state and travelling wave state in the one with natural frequencies following Lorenztian probability density or a delta function. The dependence of the observed dynamics on the parameters of the model is explored and we find that the onset of synchronization in the model displays a non-monotonic dependence on both positive and negative coupling strength. 展开更多
关键词 Kuramoto model modulated travelling wave state conformist contrarian
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