改进的云资源调度自相关匹配数据融合算法

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。     

多信息融合迭代恢复匹配的访问路径偏移修正

在CStor云数据库访问中,细粒度云存储数据的信息特征存在个体较大差异,访问路径产生多频偏移,数据访问调度性能受限。传统方法中采用PSO局部搜索方法进行访问路径修正,搜索效率低,个体更新较慢。提出一种基于细粒度云存储数据迭代恢复匹配的云数据库访问路径偏移修正算法,以PSO多信息融合Pareto支配集为指导,构建多信息融合细粒度数据的主特征模型,采用迭代恢复匹配方法增加了局部搜索提高搜索到全局最优解的几率,实现路径偏移修正。仿真实验采用3组测试集对CStor云数据库进行访问调度和路径偏移修正,结果表明采用该算法,实现对访问路径的动态实时修正,收敛距离较小,提高了CStor云数据库访问和数据挖掘性能。     

基于边缘逆理论的辨识系统并行查询扩展算法

多源数据辨识系统广泛应用在机载数据辨识控制、大型机械设备故障诊断和云存储系统数据库集成等领域。对多源数据的辨识系统并行查询和数据调度中,因数据的静态非线性测量过程影响了查询效益,需要对辨识系统并行查询链路进行扩展。提出一种基于振幅调节Fourier变换边缘逆理论的辨识系统并行查询扩展算法。进行多源数据辨识系统基本构造和模型设计,提取查询特征信息,采用RBF神经网络系统进行多源数据输入自适应学习,构建神经网络辨识系统的边缘逆向量,采用边缘逆理论进行振幅调节Fourier变换实现多源查询数据的状态重组,实现查询链路扩展设计改进。仿真结果表明,该算法提高了辨识系统的查询通道的链路相位,多源数据调度的时间成本及空间成本大幅降低,加速比提高,算法将在系统状态识别、机械故障智能诊断等领域具有较高的应用价值。     

基于信息融合的虚拟数据分离动态云存储设计

提出一种基于信息融合的虚拟数据分离动态云存储设计方法。构建了虚拟数据的分离动态云存储调度模型,进行信息特征提取,对提取的云存储信息特征进行信息融合处理,实现虚拟数据分离动态云存储改进设计。仿真结果表明,采用该算法进行云存储设计,能较为准确地反映虚拟数据的细节信息特征,提高数据融合精度,为实现动态分离存储提供优化索引通道,进而提高云存储中数据调度性能。     

安全性云资源数据库技术的分析研究

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。     

Petri网下基于结构进化的电商虚拟机数据访问

在Petri网下构建电商虚拟机离散并行系统,海量的电子商务信息数据以云存储方式寄存在虚拟机离散并行系统中,需要对数据进行准确访问,提高电商数据调度能力。提出一种基于结构进化的Petri网下电商虚拟机数据访问方法,构建Petri网下电商虚拟机数据库模型,进行电商虚拟机数据的信号模型构建的特征信息分析,设计基于结构进化的改进的遗传算法,采用多窗谱特征提取分析电商虚拟机数据访问过程中的数据偏移,通过结构进化控制数据访问过程中的指向性分布差异,实现对电商虚拟机数据访问算法改进。仿真结果表明,采用该算法能有效实现电商虚拟机数据访问幅度特征提取,在不同虚警干扰下对Petri网下的电商虚拟机数据进行访问的数据准确检测概率较高,数据访问抗干扰能力强。     

基于自适应特征映射的云数据管理索引算法

随着Web数据库技术的发展,需要对云数据进行索引管理,提高Web数据库访问能力。传统方法采用高斯边缘化路径控制方法进行索引,在无法及时获知Web云数据的先验语义特征信息时,索引精度不高。提出一种基于自适应特征映射的云数据管理索引算法。构建云数据管理模型,提取云数据自适应特征,采用语义相似度特征分析方法实现特征映射,采用一维搜索方法进行峰值搜索,初始化数据库索引起始时间点,设置语义高斯边缘化索引复激活函数,对本层链路和跨层链路进行均衡处理,达到云数据管理和优化索引的目的。仿真结果表明,采用该算法能有效提高云数据管理索引精度,提高云数据的准确调度和访问能力。     

基于WSN监控的电动汽车并行数据采集系统设计

电动汽车的并行数据采集系统设计提高电动汽车的运行状态和故障监测性能,传统的电动汽车并行数据采集采用VIX总线采集方法,随着电动汽车分布空间的增大和节点增多,并行总线上出现数据拥堵,导致监测性能不好。基于无线传感器网络(WSN)节点监控技术,提出一种基于WSN监控的电动汽车并行数据采集系统设计方法,首先结合电动汽车充电桩的传感器节点分布,进行了电动汽车路面节点分布定位融合,采用WSN监控方法进行电动汽车的传感器网络并行数据信息传输信道模型调制,采用DSP数字处理芯片进行电动汽车并行数据采集系统硬件电路设计。仿真实验结果表明,采用该系统进行电动汽车并行数据采集,具有较好的电动汽车运行状态实时数据的采集和融合处理能力,提高了对路面电动汽车运行状态的实时监控和管理能力。     

基于融合特征空间的云数据离散调度逼近算法

基于融合基础架构的新一代数据中心,提出一种基于融合特征空间构架的云数据离散调度逼近算法,在对系统节点进行数据采集任务分配的基础上,研究基于云计算的IAAS层基础设施自动化快速供应的技术方案,对云数据离散分配任务进行评价和估计,描述了云数据采集和特征空间融合架构方法,构建云数据采集和特征空间融合机制,进行融合特征空间构架下的数据离散调度逼近算法改进设计。研究结果表明,该方法实现云数据离散调度的压缩性能很稳定,有效节约了任务执行时间,云数据离散调度逼近的收敛步数较少,收敛性好,展示了较强的实用性和优越性,为云计算的顶层设计PAAS与SAAS提供技术平台支持。     

贝叶斯粗糙集云数据深度融合算法

云计算环境下,需要对云数据特征进行深度融合,提高对云数据的调度和决策能力。传统的云数据融合算法采用置信增益概率分配算法,当云数据出现多重特征时,融合深度不够,信息提取效果不好。提出一种基于贝叶斯粗糙集的云数据深度融合算法。引入了置信增益函数贝叶斯粗糙集,得到贝叶斯粗糙集云数据模型构建,在特征空间关系中进行特征合并,进行决策表决策属性分区处理,提高融合精度,依据信任函数最大化原则确定新对象的决策属性取值,实现云数据深度融合算法改进。仿真实验表明,采用该算法,能有效提高数据融合深度和精度,稳健性较好,可以明显的抑制噪声的影响,并提高20 d B左右的特征空间增益,算法在高维空间中仍体现出了较为明显的数据融合优势,该算法在云计算和云数据信息处理等领域具有较好应用前景。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

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.     

Cooler temperatures inductive to locust outbreaks

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.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

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.     

Low doses of a red wine ingredient figh diabetes in mice

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.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

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.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

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.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

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.     

Prevalence of soft neurological signs in Chinese people

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.     

Molecular motor assembly of a biomimetic system

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.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<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