共查询到20条相似文献，搜索用时 78 毫秒
1.
《科技通报》2017,(12)
资源调度是云计算的重要问题之一,调度策略对云系统性能及运营成本产生直接影响。为了更好满足用户需求,在云计算环境下对多样性资源,提出一种考虑性能及信任需求混合遗传和蚁群思想的负载均衡高效调度方法。依据云计算虚拟性和弹性化要求,提出二级调度策略,先从用户应用程序至虚拟机调度,按照用户多样化需求,将任务性能需求及信任需求作为考量情况,分别通过综合性能效益参数值及综合信任效益参数值描述用户性能需求和信任需求。第二级调度为将任务配置给虚拟资源,基于遗传和蚁群思想,将分类后的任务个体根据适度值大小排序,选取全局最优初始值,通过蚁群搜索获得局部最优解,从而完成多样性资源负载均衡调度过程。仿真实验证明,运用文中资源负载均衡调度方法能够提升云计算系统资源利用效率。 相似文献
2.
为了解决云计算环境下,数字图书馆云数据中心虚拟机集群资源负载不平衡的问题,本文提出了一种云计算环境下,基于负载平衡的数字图书馆虚拟机集群资源调度策略。该策略可减少云计算环境下数字图书馆虚拟机的迁移数量,并改善云数字图书馆的用户服务质量。 相似文献
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《内江科技》2021,(4)
随着云平台的推广使用,平台应用已经初见成效,部分业务系统应用开始逐步向国网云平台迁移。当前云化环境针对基于物理资源部署数据库服务的支撑能力不足、兼容性不佳等问题,严重影响业务系统数据库的上云服务工作开展。我们的研究将以实现云环境下异构数据库的高可用、故障自愈、资源动态调度的系统架构为目标,实现在云环境中对异构数据库的统一运维管理,提升数据库的高可用性和适用范围,为基于云平台、大数据等技术的新一代国网信息化系统建设提供保障。我们将进行基于物理资源的数据库云资源自动化、负载均衡和动态资源调度模型、云环境数据高可用关键技术研究及试点应用、基于物理资源的端到端自动化部署和敏捷交付技术及云环境数据高可用关键技术研究及试点应用的分析策略研究。 相似文献
4.
《科技广场》2015,(11)
云计算是信息时代的新型的计算模式,代表着下一代的互联网技术。资源调度和管理是云计算的关键技术之一,资源调度的目标包括满足用户服务质量、提高资源利用率、节点负载均衡等,为此有必要借助各种调度策略与各优化算法对资源调度方案进行优化,以提高任务和资源的匹配效率。聚类是将物理或者抽象的对象集合依据相似程度划分为若干类群,源于数学、统计和经济等领域,并广泛应用于很多领域。在云计算资源调度中,用户任务的资源需求特征异同,本文基于相似分治的思想,对用户任务进行聚类处理后优化调度是云计算资源调度研究的一个有效思路。实验仿真表明,任务聚类策略有效地提高了后续任务资源调度优化的效率。 相似文献
5.
校园网网络负载均衡技术研究 总被引：1，自引：0，他引：1
随着Internet的迅猛发展,互联网用户敷和流量呈几何级数增加,造成服务器超负荷运转,负载平衡高度是解决服务器超负荷运转的有效途径.本文分析了服务器负载特点和负载均衡常见调度算法,提出了自适应调度算法,根据服务器负载状态变化进行资源调度. 相似文献
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为了解决云计算环境下数字图书馆资源管理与应用问题,本文设计了一种云计算环境下优化的数字图书馆资源管理与应用平台。该平台可动态实现虚拟化资源的调度和负载均衡,用户在云计算环境中能够得到较高的虚拟化资源利用效率。 相似文献
8.
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
9.
《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
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
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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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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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《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
17.
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
18.
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
19.
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
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