共查询到20条相似文献，搜索用时 296 毫秒
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提出了一种改进的基因表达式编程算法,将这种算法和传统的基因表达式编程算法进行了对比。算法中设计了种群约简和种群更新两个算子,来提高种群多样性进而改进传统GEP算法的性能。实验显示改进的算法优于传统算法。 相似文献
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为了提高无功耗起动器外观缺陷检测的效率,需要机器视觉精确地检测出其边缘信息,针对传统Canny算法应用于起动器边缘检测时,存在边缘错检率高和伪边缘明显的问题,提出了一种改进Canny算法。算法对传统Canny算法的高斯滤波器、梯度计算和阈值分割等多个要素进行了改进。改进Canny算法应用于起动器边缘检测,有效地降低了边缘错检率和消除了伪边缘。实验结果表明,应用改进算法的起动器边缘检测方法,获得了更清晰的边缘轮廓,峰值信噪更高,处理速度更快。 相似文献
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提出了一种区间可变的改进直方图均衡化算法,给出了相应的理论公式与计算处理步骤.实验结果表明,改进算法消除了传统算法处理图像带来的高亮、不自然、高亮细节丢失等现象,同时还表明了改进算法比传统算法具有很大的灵活性. 相似文献
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三次Bezier曲线是常用的一种曲线,本文在讨论其传统生成算法的基础上,又进行了进一步的改进,使其生成速度大大提高。 相似文献
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针对目前物联网系统中无线传感器网络在传播信息时能耗损失严重的问题,本文提出了一种应用于物联网无线传感器的改进SIFT算法。该算法基于传统SIFT算法,并在其基础上,进行了节点端自适应优化和全局性动态调整的优化方案。通过参考路由层和应用层信息确定节点的优先级,修正节点的退让长度,实现重要数据先行;通过对接人节点数目和数据流的统计,实现对参数组和信道竞争窗口长度的全局性动态调整。实验表明,本文提出的改进算法在能耗上比传统算法优秀,值得推广使用。 相似文献
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以简单TSP问题为例描述了传统蚁群算法过程,提出了其存在的问题及解决该问题的方法.提出了复杂TSP问题的定义,结合改进后的蚁群算法提出了解决复杂TSP问题的方法.通过实验表明,改进后的蚁群算法能够用于解决复杂TSP问题. 相似文献
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《科技创业月刊》2017,(5)
随着计算机技术和互联网的飞速发展,Web2.0的成熟与广泛应用,数据呈现爆炸式增长,传统的数据挖掘算法在处理海量数据时效率低下,云计算的出现为其改进带来了新的方式。云计算通过集群威力,实现了对海量数据的可靠存储和高速计算。Hadoop作为一款比较成熟的开源云计算框架,以其高效、可扩展、低成本等优点在数据挖掘的相关领域得到了广泛应用。通过对改进算法的详细阐述和设计,结合实例论证了改进算法的可行性,并对改进算法进行了分析。通过实例分析,得到改进算法具有更高的效率,降低了时间复杂度和空间复杂度。云计算给数据挖掘算法的改进带来了新的方式,数据挖掘将成为未来的研究趋势。 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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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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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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《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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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
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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