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专业虚拟社区是知识传播、分享和创造的有效载体,也是成员构建网络人际互动关系的平台。国内外学者已经开始展开虚拟社区成员的社会网络关系研究,但是成员线下互动关系对线上知识分享行为是否存在或存在何种影响作用目前还没有得到充分的关注。构建了成员线下互动关系和成员个人参与、社区管理水平与成员知识贡献水平的影响模型,通过在线问卷调查获得224份有效问卷,采用层次回归分析证实了成员线下互动关系对线上知识贡献水平具有显著直接影响和调节作用。丰富了社会关系理论在互联网领域的研究成果,对专业虚拟社区的知识传播和创造具有重要的指导意义。 相似文献
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【目的/意义】随着网络和多媒体技术的迅速发展,知识虚拟社区作为一种以实现教育和学习为目的的网络
学习共同体,亦成为学习者进行知识共享和经验交流的重要平台。对教育虚拟社区中知识传播的网络结构研究能
够帮助认识知识扩散模式,有利于虚拟社区中的知识组织和知识管理。【方法/过程】本文基于知识图谱理论以
MOOC（慕课）为例构建知识传播社区图谱并分析其网络结构,使用社会网络分析方法分别从宏观和微观剖析知识
传播社区中以学生学习课程构成的网络的互动结构特征和互动关系特征,挖掘知识传播模式。【结果/结论】研究结
果揭示虚拟教育学习社区各节点的关联关系以及路径距离。学生学习课程网络中的节点连接紧密,形成的社区较
明显;具有较高中心度和PageRank值的课程更受学生欢迎;具有较高中心度和PageRank值的学生更积极参与课程
互动。研究结果为在线教育知识传播社区用户管理和知识管理提供依据和方法支撑。【创新/局限】论文从理论层
面论述了知识图谱理论构建教育虚拟社区知识转移及知识传播网络,通过可视化图谱呈现知识社区网络结构;
MOOC作为数据源分析教育虚拟社区网络结构,且采集的样本数据量还有待增加,具有一定局限性。 相似文献
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基于共同的兴趣和需求,对等网(P2P)中的节点用户很容易形成虚拟社区.文章利用P2P网络的社区特性,通过挖掘各个层次用户的本地资源及搜索历史记录,形成跨社区路由模块和跨社区历史查询记录管理模块,使得查询首先发送到这些节点而不是相关社区的所有节点上,在此基础上提出了跨社区的P2P语义检索框架,并分析了各个功能模块的实现方法和技术,最后对未来研究进行展望. 相似文献
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在消费者共创价值这一新兴模式下,探讨社区主办企业管理行为、社区认同和消费者知识贡献行为之间的关系。基于来自我国企业虚拟社区成员的403份调查问卷,通过结构方程模型方法对概念模型进行实证检验。结果发现,社区认同对知识贡献行为存在显著的正向影响;主办企业的促进认可、增加成员嵌入和物质奖赏三种社区管理行为对社区认同的形成有显著的促进作用;其中促进认可还对消费者知识贡献行为有直接的正向影响。 相似文献
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在虚拟社区快速发展的背景下,企业如何通过以分享知识和经验为主的虚拟社区平台获取有效需求信息便成为一个亟待解决的问题。本文基于以分享知识和经验为主的虚拟社区,对隐含于虚拟社区中的需求信息的特点以及参与虚拟社区的成员特征进行了分析。鉴于虚拟社区中需求信息以及社区成员的特征,针对隐含于虚拟社区中的需求信息难以有效获取,引入共词分析法,提出基于共词分析的有效需求信息获取框架,得到在虚拟社区下获取有效需求信息的步骤。 相似文献
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本研究从虚拟社区知识共享和社区参与的动因出发,来探索虚拟社区成员人际信任和自我效能的影响,构建虚拟社区人际信任和自我效能对知识共享和社区参与水平影响的理论模型,提出相关假设。对虚拟社区的注册会员进行问卷调查,对问卷调查所得的292份有效问卷的样本数据,运用结构方程模型分析软件AMOS17．0进行探索性和验证性分析,检验了所提理论模型和研究假设。实证研究表明,社区成员情感信任和自我效能有利于虚拟社区知识共享和社区参与水平的提高。 相似文献
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网络虚拟社区的发展依赖于社区知识共享的程度,通过博弈模型的构建与分析发现,不完全信息、有限重复、初始策略选择不共享都会导致虚拟社区知识共享陷入困局。但是,在时期界限变为无限大,即社区成员对通过社区获取知识产生依赖时,可能会出现新的均衡,形成虚拟社区知识共享无限重复博弈,导入激励机制及提高社区知识总量可以使这种可能性成为现实。 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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《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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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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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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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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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