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多服务器环境下网络具有随机性和异构性,导致传统方法由于算法收敛效率低、易出现局部最优等弊端,大大降低网络调度的效率,无法有效完成网络调度,提出一种基于重复博弈算法的多服务器环境下网络调度方法,塑造多服务器环境下网络调度模型,依据网络调度模型以及博弈论原理,通过最优反应函数对多服务器环境下网络进行调度,将其转换成目标规划问题,采用混沌粒子群优化算法对目标规划问题进行求解,从而有效完成多服务器环境下的网络调度。实验结果说明,所提的网络调度方案可提高网络调度的速度以及效率,能够有效处理多服务器环境下网络任务调度过程中出现的问题。 相似文献
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云计算下虚拟信息资源大数据特征集成调度 总被引：1，自引：0，他引：1
《科技通报》2015,(10)
研究大数据环境下基于云计算的虚拟企业信息系统构建和调度模型,通过对云计算环境下的虚拟企业信息资源特征集成调度,提高数据访问和管理能力。传统的集成调度方法采用层次分析法,通过粒子群(PSO)算法进行虚拟企业信息管理存储系统的任务调度,存在信息管理迟滞等问题。提出一种基于模糊循环堆栈控制的虚拟企业信息管理资源信息特征集成调度算法,把虚拟企业信息管理资源信息调度网络的能量节点进行模糊循环堆栈控制设计,得到虚拟企业信息管理资源信息调度配置的权值,实现对虚拟企业信息管理资源的大数据特征融合和集成。仿真实验表明,该算法能有效提高虚拟资源大数据特征集成调度成功率,执行时间缩短,具有较高的应用价值。 相似文献
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李昳 《科技成果管理与研究》2012,(11):48-50
无线资源管理是一个密不可分的逻辑实体,从算法和功能角度划分为分组调度、切换控制、接入控制和负载控制等,但是不同算法之间互相关联,互相影响,存在过多的制约因素。文章在LTE系统下行链路环境背景下,提出一种基于虚用户的调度方案,即VU-K＆H／MPF方案。通过仿真手段,分析不同参数变化对VU—K＆H／MPF算法所产生的影响,研究该算法的性能优势,着重指出分组调度在未来通信标准发展的重要地位。 相似文献
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提出一种基于自适应控制理论的机电控制系统算法设计,以某型智能水下航行器控制系统为例,设计出并联参考模型自适应控制系统。设计出基于自适应控制理论的机电设备控制系统,设计了控制系统的硬件电路图,对某型智能水下航行器控制系统的俯仰、偏航和横滚三个通道单独进行设计,分别设计出控制算法,得到俯仰、偏航和横滚控制三个通道的控制系统输出信号仿真结果和软件系统。控制系统的设计和仿真结果显示控制性能实时稳定,软件系统具有较高的人机交互性和友好性,能有效应用与某型水下智能航行器的控制系统中。 相似文献
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多媒体服务器的混合协议设计与实现的关键在与设计混合协议激振算法,通过激振算法设计提高多媒体混合服务器在饱和状态下的吞吐量。传统方法采用动态时分多址协议进行混合协议激振设计,当系统中节点众多、网络拓扑易变状态下,服务器的吞吐性能不好,提出一种基于CDMA协同调度的混合协议激振算法,并设计多媒体服务器,将大型多媒体联合服务器网络接收端和发送端数据的信息熵作为信道传递向量函数,在成功完成调度后,从节点开始进行正常收发工作,实现对时分多址(E-TDMA)协议设计。通过CDMA协同调度,在多媒体混合服务器的每一维度进行数据集分割,得到激振冲击响应。进行多媒体服务器总体模型构建与网络模型设计,在MAC层分别采用,三种协议进行系统调度和多媒体服务器的激振设计与仿真实现。仿真结果表明,该模型能有效提高多媒体服务器的吞吐性能,多媒体信道传输时间消耗最短,体现了算法较好的稳定性和鲁棒性能,对多媒体信息传输的保真性较好。 相似文献
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用户端数量及多样性不断增加变化,原有网络资源调度算法已经不能够满足多个链路层及多个专网同时对网络资源进行调试的业务需求。实际应用中重帧丢帧的现象频出,数据传输完整性得不到保障。在WiMAX Mesh模式下,对WAN资源进行调度,提出一种基于层次划分行为状态重组的网络资源调度算法,通过调节层次的网络流量及两个层次间的距离矩阵进行数据传输,根据网络不同层次划分行为特征生成网络资源调度树,合理调度每一数据帧的微时隙数来完成网络资源由上级转发至下级的传输。仿真实验表明,基于层次划分行为特征状态重组的网络资源调度算法能够最优化网络资源,解决传统方法的弊端,完善了网络资源调度算法并提高网络资源利用率。 相似文献
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传统车辆调度模型针对复杂的路况和复杂的车辆流动信息,存在调度时间长、难以提供实时调度时间的缺点,从而造成模型中前后级调度信号失联、调度算法冲突,效率不高的问题.本文提出一种改进遗传算法交通调度平台大规模拥堵优化调度方案.通过对算法编码过程进行合理的优化,加入针对多调度中心的约束条件防止算法陷入早熟,通过不同的分析角度,分别建立的回路形式和时间优化控制形式对车辆进行合理的调度.仿真结果显示,改进后的算法有效地降低了车辆平均延误时间,提高了交通运行效率. 相似文献
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《内蒙古科技与经济》2021,(8)
分别从控制手段及控制策略、控制方式、调压手段、输入输出、通信配置方面介绍了风力发电AVC控制系统的基本原理,利用仿真实验工具RTDS对其进行电压调节动模仿真试验,并对风力发电AVC系统的调控性能进行了评估,试验结果表明:AVC系统满足电网调度所需要求,对保证电网的电压合格率、减少无功损耗、增强系统的安全稳定运行能力发挥了关键的作用。 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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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
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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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Leah A. Lievrouw 《The Information Society》1998,14(2):83-96
The main premise of this article is that in information societies generally, and in virtual social contexts particularly, a distinctive style of interaction to facilitate the communication of difference, heterotopic communication , has emerged. It rests on two cultural foundations: an ideological belief in the positive, socially integrating power of communication, and a prevailing ethic of instrumental rationality, subjective individualism, and strategically practiced self-interest. The former is demonstrated by the use of simulation and spectacle as sources of information; exhibitionism/voyeurism as a communicative style; and the awareness of surveillance. The latter is seen in the competitive use of knowledge as a commodity; a surface globalism masking deep parochialism; lateral as well as vertical information inequity; and the use of public versus private as strategies for engagement rather than as spaces. Those who engage in heterotopic communication resort to their 'own devices' both in the sense of personal agendas, strategies, interests, and interpretations, and in the form of the telecommunication tools that help realize them. These personal and technological devices allow individuals with the right educational and technical resources to avoid exposure to disagreement, difference, or other information that does not serve their direct purposes or reflect their particular views of the world; yet they also help convey the appearance of openness, availability, and cooperation. This style of interaction is used strategically in combination with information and communication technologies to gain social or economic advantages, but it may encourage social separatism and parochialism, inhibit the negotiation of disputes, and emphasize competing interests. 相似文献