共查询到20条相似文献，搜索用时 314 毫秒
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【目的/意义】利用网络分析方法对融入引文内容的引文网络中的知识流动规律与模式展开系统研究,以期
为引文网络中的知识扩散、转化与创新提供理论与实证依据。【方法/过程】选取描述性统计量和网络分析指标,对
知识节点的知识流动能力及角色、知识群落的知识流动类型及结构、整体网络的知识流动分布特征及结构特征进
行深度刻画和剖析。【结果/结论】依据CNKI数据库主题期刊论文为测度数据,分别构建“智库”“数字人文”“数据治
理”三个主题的引文网络,并依据文中方法比较分析其间知识流动特征的异同。文中方法能够深入挖掘学术文献
间的知识关联,弥补过去引文网络知识流动研究中因忽略深层次引用信息而产生的缺陷。【创新/局限】本文采用多
种指标与方法对引文内容视角下引文网络知识流动规律与模式展开系统研究,但是未从整体引文网络中抽取反映
某一或某些知识属性的个体引文网络进行分析。 相似文献
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[研究目的]当前借助引文关系开展知识流动规律分析的研究已经十分常见,但对于知识的融合与扩散过程的研究还不够深入。从复杂网络视角分析中美学者所创造知识的流动规律有助于厘清两地的科学生产力及知识流动的差异。[研究方法]通过引用关系构建知识融合级联网络和知识扩散级联网络,采用复杂网络分析法从网络数量特征、网络结构特征和级联网络国别等特征维度对中美知识融合网络和知识扩散网络进行对比分析。[研究结论]研究发现,纯美国学者组发表文献不论是知识融合级联网络还是知识扩散级联网络规模均更大,形成的知识融合级联网络密度、接近中心性和PageRank平均数更大。物理学相比于社会学,其文献的知识融合级联网络和知识扩散级联网络呈现更加稠密、节点联系更加紧密、中心性更强的结构。本研究有助于深化对知识融合与知识扩散的认识,加深对中美两国科研生产力差异的理解。 相似文献
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基于社会网络分析法的组织知识网络及其优化 总被引：8，自引：2，他引：6
组织内的知识流呈现网状结构,这一结构的形成与知识在组织中转移和扩散的社会属性息息相关.社会网络分析(Social Network Analysis,简称SNA)通过量化描述和度量知识网络以发现组织内知识流动中存在的问题.将SNA引入组织知识网络研究,分别从"自我中心社会网"和"整体社会网"的角度,以某企业研发团队的知识网络为实例,对组织内部知识网络的相关问题进行探讨,包括确认节点的知识交流关系、测度节点间知识交流强度,识别知识团体和关键知识节点等.在此基础上提出组织知识网络优化的原则及方法,并在实践中通过相应措施,实现了对组织知识网络的量化测评和结构优化. 相似文献
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【目的】梳理并分析期刊间知识扩散模式和研究应用,以促进期刊全方位发展,并为期刊定位及规划发展策略制定提供新的角度。【方法】通过文献调研和内容分析,对国内外期刊间知识扩散相关文献进行提炼总结,系统分析期刊间知识扩散路径模式以及相应的测度指标。【结果】在明确知识扩散相关概念的基础上,从扩散路径、测度指标和相关应用等方面对期刊间知识扩散相关研究进行述评,归纳扩散过程中的内在演化路径及规律。【结论】未来可考虑在已有理论基础上借鉴多学科理论方法和构建多层网络的融合分析,进一步考虑多维影响机制来优化知识扩散模型,同时关注引文内容对扩散程度的影响,优化改进现有指标以全面衡量扩散现象。 相似文献
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比较了文献引文和网络链接的特点,从引文数量和引文类型两个方面对文献引文和网络引文进行比较,最后从假设前提、指标和工具三个方面对文献引文分析、网络链接分析和网络引文分析进行比较。 相似文献
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知识链接是知识服务的基础,基于引文网络的知识链接能够把具有引文关系的文献聚合形成知识网络.分析引文与引文网络的概念和分类,阐述了基于引文的知识链接的含义和特征,最后提出基于引文网络的知识链接框架模型. 相似文献
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【目的/意义】从引文内容视角探究引文网络的拓扑结构及其组成要素的知识属性与引文网络中知识流动
效应间的关系。【方法/过程】首先,在阐述引文内容视角下引文网络知识流动主要特征的基础上,从静态特征属性
和动态结构属性2个方面构建了知识流动的演化动力模型;然后,依据影响引文网络中知识流动效应的主要因素,
从知识吸收效应、知识叠加效应和知识成本效应3个方面构建了知识流动效应函数的数学模型;最后,借鉴描述知
识溢出效应的蜂巢模型及其修正模型提出了知识流动效应系数的计算方法。【结果/结论】运用Netlogo设置演化动
力模型的初始参数,并通过仿真实验剖析各因素对知识流动效应系数的影响机理。文中方法可为客观反映引文网
络中的知识流动规律与模式,并揭示引文网络中的知识流动效应提供一套可参考的实证模型。【创新/局限】本文通
过计算实验方法从理论上较为系统地分析了引文内容视角下引文网络的知识流动效应,得出了一系列结论,但并
未结合实际题录数据的计算结果进行对比和优化。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献