共查询到20条相似文献，搜索用时 46 毫秒
1.
主要基于Web of Science科技论文和Derwent专利文献,利用SATI、SPSS等分析工具,提取文本关键词并构建相异共现矩阵,采用多维聚类方法识别研究热点主题。在继承和发展Naoki Shibata技术机会理论的基础上,通过对比科技论文和专利文献研究热点主题的差异来识别金属3D打印的技术机会。研究得出,科技论文和专利文献分别有4个研究热点主题,识别了两大类共4个技术机会。首次基于专利和科技论文研究金属3D打印的技术机会,开拓了金属3D打印的研究视野,对金属3D打印行业的企业战略决策具有指导作用。 相似文献
2.
3.
针对1995-2016年间SCI核心数据库中有关“3D打印”主题的2769条文献记录,借助CitespaceIII科学知识图谱软件,选用“聚类”、“标志性文献”、“突发文献”和“突现关键词”四大指标,综合性探索3D打印的研究热点及其演化过程,并展望未来的3D打印研究热点。研究发现：(1)3D打印的研究热点最早出现在1993年,从2005年开始迅猛增长,在2013年出现高峰；(2)热点主要集中在“医疗支架、器官与药品”、“快速成型”、“增材制造”和“化学合成反应”等领域,也出现在“超声波固化”、“激光烧结”和“金属基复合材料”等技术层面；(3)“医疗领域”的相关研究出现最早,并且至今保持异常活跃；(4)“增材制造”、“3D生物打印”、“钛合金”与“化学合成反应”等是近年来最新兴的研究热点；(5)“商业化运营”和“与大数据等新兴技术的融合”等有可能成为未来的研究热点。研究成果可以促进3D打印相关理论的发展,为科研人员确定3D打印领域的研究重点和方向提供参考,为企业掌握市场竞争主动权和政府规划3D打印产业发展提供借鉴。 相似文献
4.
5.
为了解当前国际钛合金3D打印颠覆性创新研究的现状及趋势,以Web of Science中钛合金3D打印颠覆性创新的350篇文献为数据池,借助于CiteSpace软件进行文献科学计量分析。对三维分布、国家合作网络、机构分布、主要期刊、关键人物进行分析,以了解钛合金3D打印颠覆性创新研究领域的基本情况;对关键词、突显词共现分析进行研究,以了解钛合金3D打印颠覆性创新研究领域的热点;对高被引文献进行分析,以了解钛合金3D打印颠覆性创新研究领域的重要基础知识。研究表明:近几年来钛合金3D打印颠覆性创新研究处于快速发展阶段;核心机构是北京航空航天大学、西北工业大学等;核心期刊是MAT SCI ENG A-STRUCT、ACTA MATER等;核心作者是Murr、THIJSL等;热点主题是微观结构、增材制造等;一些作者的高被引文献构成学术研究的重要基础。分析结果有助于学者把握该研究领域的现状和发展趋势,还可为钛合金3D打印颠覆性创新的后续研究提供参考。 相似文献
6.
基于高被引论文的情报学研究现状分析 总被引：5，自引：1，他引：4
应用<中国引文数据库>网络版作为统计源,采用引文分析法对2004-2006年我国情报学核心刊高被引论文期刊分布、多产作者、基金论文等进行统计分析,并利用关键词词频分析和聚类方法,揭示近年来我国情报学研究的热点主题. 相似文献
7.
基于文献计量学的知识管理学科发展态势分析 总被引：2，自引：0，他引：2
利用ISlwebofKnowledge信息平台和德温特分析软件对1997-2006年期间SCI和SSCI收录的知识管理文献进行分析与比较。应用共词聚类分析法对知识管理的关键词进行聚类．得到当前国内外研究的热点主题,并利用战略坐标进一步定量分析了各热点主题的发展阶段。 相似文献
8.
基于Citespace的商务智能研究热点与前沿可视化分析 总被引：2，自引：0，他引：2
分析Web of Science中以商务智能为主题的文献的时间和地域分布,借助Citespace软件绘制商务智能领域关键节点知识图谱,对关键节点文献进行共被引分析,通过Citespace关键词聚类和膨胀词探测技术,绘制出商务智能研究热点和前沿知识图谱,确定商务智能的热点研究领域和前沿发展趋势。 相似文献
9.
【目的/意义】以主题聚类的方法揭示国内图情领域区块链研究热点,为区块链在图情领域的研究工作提供
参考。【方法/过程】利用中国知网数据库检索区块链在图情领域应用的全部期刊论文、会议论文与学位论文,提取
了470个关键词,并利用杰卡德系数计算文献的相似程度,形成10个主题聚类,之后利用IG（信息增益法）计算所有
关键词在主题聚类中的重要程度,通过前10位核心关键词阐述各主题聚类中研究论文的主要研究内容,并通过主
题聚类下的年度发文趋势分析区块链在图情领域未来的发展趋势。【结果/结论】文章共提取出区块链技术、智慧图
书馆、资源建设、信息服务、阅读推广、隐私保护、借阅服务、科学数据、版权保护、情报分析十大主题聚类,并将其归
纳出包含基础层、技术层、应用层、拓展层的研究框架,分析了未来研究趋势将更加集中于情报分析、智慧图书馆、
阅读推广、科学数据、版权保护、隐私保护六大主题中。【创新/局限】对研究主题的分析还可以采用更多的视角进行
分析,如知识图谱等。 相似文献
10.
本文以信息资源管理为主题收集了CNKI数据库近五年所刊载的研究论文,以论文的关键词为研究对象,对关键词进行词频统计,获得高频关键词,建立高频关键词矩阵,运用SPSS、Ucient软件,结合聚类分析和多维尺度分析两种多元统计方法,绘制出我国2007-2011年信息资源管理研究领域的研究热点与前沿的知识图谱,研究发现信息资源、图书馆、信息服务、知识管理仍是信息资源研究核心,而以信息技术为主的虚拟环境下的数字图书馆、电子政务、电子商务的信息资源管理将成为研究趋势。 相似文献
11.
《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
12.
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
13.
《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
14.
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
15.
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
16.
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
17.
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
18.
Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
19.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
20.
Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献