共查询到20条相似文献，搜索用时 437 毫秒
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云计算数据预取算法设计是实现云平台环境下通信链路优化和任务调度均衡分配的基础技术。在传统的云计算据查询模式下,当由于缓存空间不足而导致新的缓存数据无法进入缓存时,导致数据预取拥堵,性能不好。提出一种基于Monte Carlo熵权决策的云计算数据预取算法,构建云计算数据查询模板模型,进行Hybrid缓存置换数据预取前置处理,采用Monte Carlo熵权决策方法,把云计算预取信号从缓存域变换到波束域,构建置换函数,实现了对算法的改进。仿真实验研究得出,该算法通过熵权特征提取,进行云计算数据预取决策,提高了云计算数据预取性能,大数据访问延迟率降低,云计算数据存取和调度效率提高,保真率较好。 相似文献
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随着数字化信息服务平台(DISP)广泛使用,如何提高数字化信息服务平台上的通信业务质量是难点。提出一种基于相关QoS约束信息求解的802.11e MAC层数字化信息服务平台跨层信道抢占算法。推导相关的QoS参数与DISP网络传输性能的关系,平衡不同类型业务流占用信道机会,进行相关QoS约束信息计算和信息特征信息维度匹配,实现改进的跨层信道抢占算法设计。仿真结果表明,改用该算法进行DISP跨层信道抢占,误码率最低,关键信息正确定位准确率为100%,迭代步数小,对提高数字化信息服务平台的服务质量具有重要意义。 相似文献
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提出一种基于最大熵功率谱估计的Hadoop云平台下网络音视频数据特征挖掘方法,实现对数据信息的高速访问。构建数据挖掘Hadoop云平台和数据挖掘访问模型,设计最大熵功率谱特征提取算法,采用分段思想将同一时间段的视音频数据进行群体分割,分段提取最大熵功率谱特征。将提取的特征信息进行维度匹配分箱和溯源处理,实现信息恢复,最终完成高速数据访问。仿真测试表明,该算法能有效地实现对网络音视频数据的特征挖掘,提高访问效率,访问响应时间较当前方法缩短明显。 相似文献
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传统云安全实现方法采用基于特征阀值验证的网络防护手段,云计算平台数据呈现海量状态,各种攻击特征很难选取固定的阀值,出现攻击特征偏离阀值的问题,对于包含重要数据的云计算平台来说,防护功效远远不够。提出了一种基于偏离信息融合匹配的安全云实现方法,采用偏离信息度作为衡量访问的标识,对不同偏离度下的信息进行补偿,最终采用归一化方式实现信息融合匹配。采用一组随机的访问数据进行安全测试实验,结果显示,采用基于偏离信息融合的方法,云安全的防护性能提高,具有很好的安全应用价值。 相似文献
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《科技通报》2015,(10)
对私有云计算平台上资源最优路径匹配,实现对资源的有效调度和检测,提高资源共享能力。传统算法采用云平台的资源置换算法实现云资源目标匹配,受限于机器学习技术自身的复杂性,性能不好。提出一种基于委托管理节点角色量化合成的私有云计算平台上资源最优搜索路径匹配算法。构建私有云计算平台终端数据访问和资源调度模型,根据贪心算法的收缩原则,在资源访问管理中引入互斥锁机制以保证资源共享操作的完整性,路径匹配有向图模型,提高资源路径匹配搜索能力。以全局度量为中心节点,计算逆向追踪搜索频度,实现算法优化。仿真实验结果表明,采用该算法进行私有云计算平台上资源最优路径匹配优化,能有效提高私有云平台上的资源路径匹配准确度,从而提高资源搜索成功率,实现资源优化共享,展示优越的适用价值。 相似文献
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研究GPS全球定位系统大数据库的分区方位特征分割问题,提高GPS大数据访问的抗干扰能力。传统方法采用基于块匹配的GPS大数据定位信号调度方法实现数据访问,在弱信号强干扰环境下干扰抑制能力差,算法稳健性不好。为解决这一问题,提出一种基于模式匹配的GPS大数据库分区访问特征分割算法,构建GPS大数据库数据访问模型,数据块按可靠性需求划分为若干个等级,得到储节点模块匹配模型,设计GPS大数据信息流集合划分机制,对流量信息占用概率进行特征匹配,实现GPS大数据库分区访问特征分割,通过计算数据访问的精确度和抗干扰能力等指标进行性能测试分析,仿真结果表明,采用该算法能较好地反映GPS大数据信息流的分区特征,特征分割效果较好,数据访问中抗干扰能力强,实时性好,GPS大数据定位信息访问精度较高,具有优越性。 相似文献
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提出一种基于自相关匹配滤波和云间相似程度特征提取的云资源调度数据融合算法。设计了基于云资源调度的云计算海量数据处理平台,构建数据融合预处理模型,在云资源调度系统中,设计自相关匹配滤波器,得到融合特征分簇重构空间,对特征进行模式匹配,得到后置处理滤波器的系统函数,实现了对云资源调度自相关匹配数据融合算法的改进。仿真实验表明,该算法能高精度、高平稳地实现云资源调度数据的融合,对云滴数的要求极低,数据处理效果较好,云资源调度执行任务数、云资源调度总任务完成时间、用户满意度等指标优于传统方法,展示了较好的应用价值。 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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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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《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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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