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资源负载均衡是提高云计算资源调度效率的重要因素,为提高云计算中任务调度的效率,减少执行时间,针对传统的资源均衡算法在没有考虑到云计算环境下的资源节点安全性因素,复杂度高,效果不好的问题,提出一种引入安全性函数分形维特征重组的资源均衡算法。建立任务调度策略及资源均衡模型,构造任务调度所需要时间、费用、可靠性等方面的因素进行特征描述,对负载资源信息流的分形维信息特征提取,通过分层化状态重组,实现对资源负载的均衡处理,得到负载目标函数,提高任务处理效率。实验结果表明,该算法进行Cloud Sim平台下的负载云计算任务调度和负载资源均衡,能有效节省任务执行时间,降低计算开销,执行效率优越于其它算法。 相似文献
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《科技通报》2015,(8)
传统方法使用量子群遗传进化方法进行云存储系统任务调度的执行开销建模,在数据汇聚和协议传输中没有考虑量子态的相干性和感知节点的方向性,不能全局搜索最优量子位,执行开销不能实现最小化。提出一种基于量子群聚类的云存储调度最小执行开销建模算法,首先进行量子群聚类进化策略和云存储系统任务调度模型总体设计,设计基于量子群聚类的云存储系统任务调度分配协议,进行有效的资源调度设计,整合云计算中心资源,提高资源利用率,减少任务执行时间。仿真结果得出,该算法能使云存储系统任务调度执行开销与任务规模的匹配性能最佳,性能优于传统算法,在云存储信息管理系统等领域具有较好的应用价值。 相似文献
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突发浪涌数据下差异云平台数据间的关联性破坏概率逐渐增加,降低了数据在冗余环境下查询效率。按照突发浪涌数据下云平台的弱关联数据调度特征,通过基于Apriori的弱关联数据挖掘方法,采集突发浪涌数据下差异云平台的弱关联数据,通过改进离散粒子群算法优化任务节点数字串的编码形式,实现数据调度任务,对粒子位置更新公式进行优化,采用优化离散粒子群算法进行节点寻优,获取最佳调度节点集,实现突发浪涌数据下差异云平台的弱关联数据调度。实验结果表明,该调度方案能够优化云平台资源的使用效率和服务响应时间,提高了总执行效率,节省了云资源,具有较高的节能开销比和用户满意度。 相似文献
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《科技通报》2015,(10)
在模糊云计算环境下,需要对特定数据进行识别定位,实现目标数据信号的准确检测和访问。传统方法采用先分层后分支的数据目标资源识别定位算法,定位识别性能计算复杂度较大,准确度不高,提出一种基于通信开销缩减和冗余任务删除的特定数据目标资源识别定位技术。首先对DAG图中的任务进行任务归并,然后将DAG图分层,从整个任务图的全局出发考虑任务的优先级,构建模糊云计算模型,设计模糊云计算核函数,创建多个线程的信息流特征编码,考虑对整个任务图调度时间起决定作用的关键任务,设计通信开销缩减算子,将调度列表头结点分配到使其具有最小最早完成时间的处理器内核上,提高对特定数据的目标资源定位识别性能。仿真实验得出,该算法定位精度较高,对目标资源的冗余任务进行有效删除,明显提高了任务调度效率,收敛性能较好。 相似文献
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对嵌入式Linux系统进程中的任务调度算法设计是保证操作系统稳定和高效运行的核心要素。传统的嵌入式Linux系统任务调度算法采用分簇能耗调度的PSO遗传进化算法,当任务复制和区间插入失衡时,调度效果不好。提出一种基于可变精度衰减调制的Linux嵌入式任务调度算法,首先进行Linux嵌入式任务调度平台总体设计,进行任务信息流模型构建,将嵌入式系统客户端将创建好的任务流提交给服务器,结合任务流集合中各任务流的优先级属性和提交时间,进行变精度衰减调制,得到Linux嵌入式分簇任务调度模型。实验结果表明,该算法无论是单个任务流还是在多任务流调度运行环境下,改进算法的任务调度耗时较少,通过可变精度衰减调制,保证了多任务流中的任务能够按照流程优先级属性以及提交的先后次序进行合理的分配,有效提高了Linux嵌入式系统的运行效率。 相似文献
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提出一种引入QoS开销适应度运算的云计算任务权衡调度算法,首先进行了支持多QoS因素任务调度问题描述与网格拓扑结构构建,进行云计算任务权衡调度对多用户QoS偏好的影响力数学度量,通过多QoS开销适应度运算的引入,根据计算资源的成本和数据传输时间,来确定分配任务的位置。为了适应云存储中的多QoS偏好,重新定义PSO的适应度函数,实现任务权衡调度算法的改进。通过仿真实验研究得出,采用该算法对云计算任务节点的聚类准确性较高,进行任务调度中的实时性好。通过多QoS偏好分析,引入QoS开销适应度运算,用户满意率有明显上升,适应度函数随不同类别任务变化,有效地反映不同类型任务的QoS偏好。展示了较好的云计算任务权衡调度性能。 相似文献
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《科技通报》2015,(10)
在路由冲突协议下难以实现对语义检索任务的嵌入式调度,在路由冲突协议设计和网络协议识别中,由于语义检索码在链路负载导致网络通信效率低下,为了提高语义检索任务的调度能力,避免路由冲突,提出一种基于语义相似度融合的Linux嵌入式任务调度算法。通过语义相似度特征模型构建,易于实现语义检索的嵌入式任务调度和路由信息分流。对每组语义相似度特征进行特征融合,得到Linux嵌入式分流矩阵向量长度,进行特征分解,得到样本协方差,实现算法改进。仿真结果得出,算法具有较高的吞吐率和召回率,执行效率较高,检索精度优越,有效提高了语义检索嵌入式任务调度的运行效率。在语义系统构建和检索优化设计中具有较好的应用前景。 相似文献
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《科技通报》2015,(12)
通过对云资源平台的自适应调度设计,优化整合云存储空间资源,提高系统的运行效率和资源利用率。在云资源平台任务执行中收到用户行为特征干扰因素较多,调度响应出现时滞,传统方法采用基于时间尺度分析的云资源调度方法,当资源出现随机性干扰时受到网络延迟的影响较大,性能不好。提出一种基于量化特征提取的云资源平台自适应调度方法。构建资源调度平台的总体框架结构,进行资源信息特征提取,采用云资源量化特征提取结果作为调度系统的输入函数,对多源资源信息系统访问特征进行最小方差估计,整个调度过程是一个严平稳的随机过程,通过量化特征提取,能保证对云资源各个调度节点的遍历历经性,提高调度准确性。仿真结果表明,采用个算法能有效实现对云资源平台的自适应调度,抗干扰能力强,资源利用率较高。 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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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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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
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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
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《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
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Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
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WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献