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1.
王伟明 《中国科技期刊研究》2018,29(4):393-399
【目的】 针对学术期刊多属性综合评价中指标间相关性较强的问题,提出一种新的基于社会网络分析和密度算子的学术期刊综合评价模型。【方法】 将学术期刊评价指标视为网络节点,依据节点间相关性构造关系网络矩阵。设计节点中心度和子群凝聚度,度量节点和子群的重要性。基于密度算子综合集成评价信息,计算并且排序学术期刊综合评价值。【结果】 以图书情报类学术期刊为研究对象,实证结果表明该方法能够充分顾及指标间的相关性,得出较为合理的评价结果,是一种切实可行的学术期刊综合评价方法。【结论】 基于社会网络分析和密度算子的学术期刊综合评价模型为科研机构评价学术期刊提供了一种新思路。 相似文献
2.
[目的/意义]针对学术期刊多属性综合评价中指标权重获取以及评价信息集结的问题,提出一种新的基于差异驱动和GRA-TOPSIS法的学术期刊综合评价模型。[方法/过程]首先,利用基于拉开档次法的差异驱动原理来最大限度地体现各学术期刊之间的整体差异,并据此确定学术期刊的指标权重;然后,分别利用GRA法和TOPSIS法对评价信息进行综合集成,计算两种方法的学术期刊综合评价值;最后,基于组合评价的思想对两种评价结果进行有效结合,以此确定学术期刊的最终评价值并排序。[结果/结论]选取"农业经济"类期刊为研究对象,结果表明,该方法不仅能够充分体现各学术期刊之间的实际差距,还能够同时从数据距离和数据几何形状上反映学术期刊的综合水平,是一种科学合理的学术期刊综合评价方法。 相似文献
3.
【目的/意义】为商务网络信息生态链价值流动问题的研究提供可以借鉴的理论与方法,并为实现商务网 络信息生态链价值流动效率最大化,乃至实现整个商务网络信息生态链价值增值和价值共赢提供一定的实践指导 作用。【方法/过程】首先,挖掘出商务网络信息生态链价值流动的关键影响因素,从而构建商务网络信息生态链价 值流动综合评价指标体系;然后,利用Delphi法-熵权法相集成的组合赋权法以及TOPSIS法与灰色关联度法相结 合,构建商务网络信息生态链价值流动综合评价模型;最后,利用该综合评价模型针对实际问题开展综合评价。【结 果/结论】通过实例分析表明,基于组合赋权灰色关联TOPSIS的商务网络信息生态链价值流动的综合评价模型较 为合理和有效。 相似文献
4.
【目的/意义】针对学术期刊多属性综合评价中指标间存在相互影响、相互关联的问题,提出一种新的基于
DEMATEL和 Choquet积分的学术期刊综合评价方法。【方法/过程】首先,应用 DEMATEL方法对学术期刊指标间
相互影响关系予以分析,由此确定各指标的中心度和原因度;然后,在考虑指标间相互关联的基础上,利用模糊测
度对各指标的权重进行建模;最后,利用 Choquet积分计算学术期刊的综合评价值并排序。【结果/结论】以图书情报
类期刊为研究对象,结果表明,该方法能够充分考虑指标间的相互影响、相互关联关系,是一种科学合理的学术期
刊评价方法。 相似文献
5.
【目的/意义】应用改进的AHP-BP方法构建基于用户感知的科研项目数据库服务质量评价体系。【方法/ 过程】根据传统AHP法得出指标权重,计算出专家群组的净感知相关系数矩阵,确定了专家权重,进而求解得到评 价指标的综合权重,然后以多组数据为先验样本进行BP神经网络的训练、测试和验证,从而得出了可供推广的 AHP-BP神经网络的科研项目数据库综合指标权重模型。【结果/结论】对指标权重的分析表明,对于科研项目数据 库来说,内容是最关键的评价指标,且改进的AHP-BP神经网络评价模型所得结果更加客观合理。 相似文献
6.
【目的/意义】构建科学的生态数据评价模型是生态文明建设的重要内容,需要从针对性、严谨性入手对数
据进行归纳分析,为提高评价体系的准确性提供有力数据支撑。【方法/过程】本文以我国省际生态指数为例,运用
熵值法对评价指标、权重进行优化,通过数据模型的构建,从海量数据中筛选出能够科学、精准地评价我国省际当
前生态文明建设现状的数据指标。【结果/结论】基于熵值法的评价模型,合理地解决了评价体系评价不精准、不符合
实际的问题,展示了省际生态发展情况,提出了我国省际生态发展评价问题的解决途径,实证研究的结果表明该评
价方法是科学的。【创新/局限】本文利用改进的熵值法,得到我国省际生态指数数据评价模型,用于后续的综合评
价。鉴于数据的可获得性,部分研究采取了数值模拟方法,未来要完善计量模型分析,进一步提高结果的精准度。 相似文献
7.
刘莲花 《中国科技期刊研究》2016,27(6):645-649
【目的】采用循环修正的组合评价方法对期刊进行综合评价,以解决多种评价方法结论的非一致性问题。【方法】先采用TOPSIS法、主成分分析法、因子分析法和加权算术平均法对预防医学与卫生学核心期刊进行了综合评价,并通过肯达尔一致性系数对四种方法进行了一致性检验,然后利用平均值法、Borda法、Copeland法对四种单一评价结果进行了循环修正评价。【结果】经过两次循环评价得到了一致的结论。【结论】循环修正的组合评价方法能有效解决多种评价方法结论的非一致性问题,从而提高期刊评价的全面性和科学性。 相似文献
8.
【目的】探讨单一评价模型和组合评价模型在科技期刊学术影响力综合评价中的适用性,以引起科技期刊对组合评价模型的重视。【方法】 运用均方根法、熵值法、主成分分析法和因子分析法对18种科技期刊学术影响力进行评价,对评价结果进行Kendall检验,在此基础上建立模糊Borda组合评价模型对样本进行再评价。【结果】 单一评价模型通过了Kendall检验,但从方法适用性上看,因子分析法最佳,主成分分析法次之,熵值法适用性较差,均方根法不太适合用来评价科技期刊学术影响力。模糊Borda组合评价模型具有较强的适用性,其评价结果与国际通用的复合影响因子评价指标较为接近。【结论】 对科技期刊评价指标进行客观赋权,运用组合评价模型进行评价能够确保评价结果更为科学可信,提高复合影响因子、复合他引影响因子、复合即年指标、被引期刊数和Web即年下载率是扩大科技期刊学术影响力的有效手段。 相似文献
9.
为了提高模糊综合评价的科学性,针对主观或者客观及主客观结合的赋权方法的局限性,提出了一种基于最优组合模型的赋权方法。该方法以改进的层次分析法和灰色关联法分别确定的主客观权重为依据,以组合权重与得到的主客观权重之间偏差最小为目标建立模型,进而确定最优组合权重。在此基础上通过模糊综合评价确定城市配电网的运行状态,提出了基于组合赋权的城市配电网模糊综合评价方法。利用该评价方法对某市配电网整体状况进行分析,结果表明,组合赋权法是合理的,同时还验证了城市配电网模糊综合评价方法的有效性,为配电网规划建设提供理论参考。 相似文献
10.
本文建立了基于层次分析法和熵值法的综合评价模型,该模型利用组合赋权法就是对不同方法求得的权重进行组合,使得到的新权重既不会偏向主观判断,又不会偏重客观判断。本文通过层次分析法和熵值法求图书馆期刊选定中各指标的权重,利用组合赋权法求出各指标的最终有效权重,并结合实例求出图书馆最优期刊种类选定方案。 相似文献
11.
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
12.
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
13.
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
14.
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
15.
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
16.
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
17.
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
18.
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
19.
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
20.
《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献