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1.
本文提出了3G智能家居系统网络负载均衡方案,通过负载均衡器将3G智能家居系统中并发任务分流到进行计算处理的服务器集群中的某一台节点设备上,得到客户请求的服务器节点将同时进行并行处理,当处理完成时将结果返回,这样就大大的增加了吞吐量,提高了服务器以及网络的容错性和灵活性。 相似文献
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在已实现的基于开源的LVS集群与GFS网络存储共享相结合的三层式体系结构的视频点播系统中,根据服务器实时负载信息动态调整权值,对已有的WLC调度算法进行优化,解决系统负载不均衡的问题,提高了系统的整体工作性能。 相似文献
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服务器集群系统的负载均衡和安全性的设计 总被引：1，自引：0，他引：1
随着互联网访问量和数据流量的快速增长,新的应用层出不穷,为提高服务系统的整体性能,采用了负载均衡集群技术。本文对服务器集群复杂均衡调度的设计与实现方法作了一些研究和探讨。通过对负载均衡集群系统的分析,提出从容错性、透明IP、建立VPN隧道、带外数据传输四个方面来加强集群系统的安全,从而提高整个集群系统安全性的理论。 相似文献
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Hadoop特有的集群任务,在真正运行之中,常会凸显不均衡态势下的负载情况。本文辨识了集群节点表现出来的执行特性、节点执行能力。建构在节点能力根基之上的多重任务,含有自适应调度这一配置方式。这类调度路径,按照节点特有的历程、现存负载状态、节点特性及关联的失效率,调整着各时段的运行总量。测验出来的数值表明,集群任务耗费的完成时段被显著缩减,节点荷载的总负荷均衡,资源调配适当。 相似文献
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Internet的快速增长使网络服务器随着业务量的提高、访问量和数据流量的快速增长,服务器的负载均衡技术就成为建立一个高负载Web站点的关键性技术。使用开源服务器软件Nginx实现负载均衡对中小心网站是不错的选择,对于大型网站也是硬件负载均衡器的有力补充。文章就Nginx负载均衡的优点和适用环境进行了阐述,并对实现负载均衡的关键性配置进行了简单的说明。 相似文献
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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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随着在线玩家人数迅速增长,MMORPG的负载问题也凸显出来.当前的主要解决方法是以地图划分游戏世界,利用服务器集群让每一台服务器管理一小块地图.本文提出了以场景划分游戏世界,并把MMORPG构件化,抽象出场景构件和角色构件,每一台服务器部署若干个场景构件,通过特定负载均衡算法驱使超负载服务器上的场景构件动态迁移,从而实现整个服务器集群负载均衡.通过实现构件原型并进行负载均衡实验,证实该解决方法切实可行. 相似文献
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对于高负荷条件下的WEB服务器集群的负载均衡,主要问题之一是如何获取实时负载及负载能否有效衡量整个网络的利用率和性能,即须找出合适的参数作为负载并动态获取到。本文就这一问题提出了对交换设备使用SNMP动态采集负载信息,用于负载模型中。主要思路是利用NET-SNMPAPI对管理设备发送get-request请求包,再处理响应包中的变量值为所需格式,接着运用到综合负载模型中,最后采用最小加权轮询调度处理用户请求。 相似文献
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目前,各电力系统应用开始采用电能质量基础数据服务获取所需的电能质量数据,以用来解决由于电能质量数据格式不同或者平台不同而造成的数据共享问题。但用户在访问电能质量基础数据服务的过程中,服务的可用性不能得到保证,服务的低可用性会使得用户不能及时获得电能质量数据。本文提出并实现了一种基于负载均衡技术的高可用性集群方案,旨在提高电能质量基础数据服务的可用性。方案的网络架构分为数据层、应用层和负载均衡功能层。负载均衡功能层通过IP虚拟服务器和心跳检测等技术来管理部署有电能质量基础数据服务的应用层。 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
14.
《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
15.
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
16.
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
17.
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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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
20.
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