共查询到20条相似文献，搜索用时 164 毫秒
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采用文献分析和调研访谈相结合的方法,构建了航空复杂产品研发团队知识集成能力评价指标体系,提出了基于熵权和区间数TOPSIS的评价模型,借助于熵权法确定了评价指标的权重,考虑到指标取值的不确定性,运用区间数来描述各评价指标的语义值,建立评价区间矩阵,再根据各方案与正理想解和负理想解的距离分析相对接近度,进行综合评价,最后结合具体实例分析了该方法应用于知识集成能力评价的基本过程,验证了该方法的实用性和有效性. 相似文献
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预研项目的中止决策是我国军队预研管理工作中的薄弱环节。提出了一种遗传算法和BP算法相结合的改进神经网络模型,利用这种方法进行预研项目的中止决策,可以使网络收敛速度加快和避免局部极小。以收集到的样本为例,对该方法进行实证研究,证明了该方法的有效性。 相似文献
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基于区间直觉模糊信息的数字图书馆馆藏的评价方法 总被引：2，自引：0，他引：2
数字图书馆馆藏的评价是数字图书馆评价的重要内容.在模糊信息环境下,评价专家对馆藏的评价指标往往给出的是区间直觉模糊信息.目前基于区间直觉模糊信息的数字图书馆馆藏的评价方法的研究在数字图书馆馆藏的定量评价中还是一个空白,因此有必要加强研究.本文引入了区间直觉模糊数的一些运算法则、得分函数和精确函数,在数字图书馆馆藏的评价指标权重给定的条件下,建立了基于区间直觉模糊信息加权平均算子进行集结的馆藏评价模型,实例分析表明该方法是有效的. 相似文献
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对教育信息化特征进行分析研究,基于教育信息化各要素的动态性、灰性和不确定性,提出了用灰色区间数表示教育信息化指标的概念,应用灰色关联聚类分析方法建立了教育信息化水平的评价模型。 相似文献
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基于信息系统身份认证安全性评价中指标值的不确定性和模糊性,使用区间数模糊评价原理,建立基于区间数的信息系统身份认证安全性模糊评价模型。该模型使用改进的德尔菲和AHP法,根据区间数判断矩阵的有关定理,确定主因素层和子因素层各指标权重和综合平均值。最后将该模型应用到一个实际信息系统进行身份认证安全性的评价,验证了该模型的有效性。 相似文献
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科学技术突飞猛进的发展促使军工企业必须通过预先研制部分项目,以确保产品更新换代的连续性,推进企业稳定、持续发展.本文结合军工企业预研项目研究的特点,着重分析预研项目风险特点,制定一套合理、切实可行的评价指标体系,以帮助企业做好预研项目风险评估工作,为企业避免不必要的损失. 相似文献
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针对电子政务系统评价存在的不确定性和模糊性,提出了基于区间直觉模糊数的多属性评价方法.首先建立了区间直觉模糊判断矩阵,提出了一种新的排序方法来获取指标的主观权重.其次定义了区间直觉模糊数的平均差概念,并提出了基于平均差最大化的指标客观赋权方法.然后把主观权重与客观权重线性集成,使得到的综合权重同时反映主观和客观程度,利用改进TOPSIS方法进行排序.最后通过算例说明该方法的可行性和有效性. 相似文献
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对教育信息化特征进行分析研究，基于教育信息化各要素的动态性、灰性和不确定性，提出了用灰色区间数表示教育信息化指标的概念，应用灰色关联聚类分析方法建立了教育信息化水平的评价模型。 相似文献
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本文探讨了决策者有偏好、方案的属性值为区间灰数及属性权重完全未知的灰色多属性决策问题,提出了解决这种灰色决策问题的方法与算法.对于属性权重完全未知,提出了确定属性权重的基于主观与客观偏差的最小化优化模型.该决策方法既利用了客观信息,又尽可能地满足决策者的主观愿望.文中实例分析说明了所提出的灰色关联决策方法的合理性及其算法的有效性. 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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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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《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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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