共查询到20条相似文献，搜索用时 62 毫秒
1.
《科技通报》2015,(10)
通过挖掘生物信息大数据,从生物信息大数据库中提取感兴趣的数据特征,分析生物信息大数据集的细节结构,提高对生物信息的采集、处理、存储、传播,分析能力。传统的生物信息大数据挖掘模型采用基于小波多窗谱提取的生物信息挖掘算法,由于生物特征的属性权重需求各异,数据挖掘精度不高,提出一种基于梯度采样局部收敛的生物信息大数据挖掘模型。首先构建生物信息大数据库模型和生物信息特征挖掘实体模型,采用提取采样局部收敛方法实现对数据挖掘模型的改进,通过求解最优输入控制序列以及索引系统最优目标函数,实现系统的控制输入和预测,使用梯度采样局部收敛的方法进行生物信息大数据挖掘检测,得到生物信息大数据的梯度采样局部收敛属性集合。仿真结果表明,能实时准确地实现对生物信息的储存、检索和分析,提高数据挖掘能力,收敛精度较高。 相似文献
2.
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
3.
研究高效进行数据聚类,提高数据聚类能力的问题。传统的模糊C均值算法具有对初始值和噪声极为敏感和遗传算法在局部极值点收敛的缺陷。基于模糊c均值聚类算法,提出一种改进的优化聚类算法。利用混沌序列的均匀遍历特性和差分进化算法的高效全局搜索能力,对模糊c均值算法进行改进,利用Logistics混沌映射对聚类算法进行优化搜索,把混沌扰动量引入到进化种群当中,弥补了模糊C均值算法的缺陷。采用改进的Logistics映射扰动搜索聚类算法,以目标识别为案例,综合4类目标特征参数为研究对象,开发了一套有价值的目标识别专家系统软件。仿真实验表明,改进的数据聚类算法,具有优越的数据聚类性能,聚类判断准确率提高明显,设计的专家系统软件对目标识别特征分类具有较好的准确性和可靠性,具有一定的应用价值。 相似文献
4.
为了提高农网物资储备点的优化管理和调度能力,需要对农网物资储备点的需求趋势进行优化预测,提出基于关联规则调度和模糊自适应聚类的农网物资储备点需求趋势优化预测方法,构建农网物资储备点需求趋势的统计序列分布模型,采用大数据挖掘方法进行农网物资储备点需求趋势的大数据统计信息建模,提取农网物资储备点需求趋势的关联规则特征量,采用模糊聚类方法对需求趋势大数据进行自动聚类处理,建立农网物资储备点需求趋势预测的优化迭代模型,结合自适应寻优算法实现农网物资储备点需求趋势优化预测。仿真结果表明,采用该方法进行农网物资储备点需求趋势预测的自适应性较好,预测精度较高,提高了农网物资储备点的自适应调度和管理能力。 相似文献
5.
为有效精确地挖掘海量数据流特征,提出采用数据集中位分割和冗余数据碎片合并的方法设计决策树并构建云平台数据特征挖掘模型。传统的云平台下数据挖掘中对碎片信息不做处理,使文本碎片成几何级增长,导致有用信息的丢失。通过挖掘冗余信息中符合挖掘条件的碎片特征,使用KD树进行数据挖掘索引,在迭代过程中,对数据进行层进中位分割,并结合碎片合并技术,构建数据挖掘云平台模型,对中位数进行维度匹配分箱,使数据的挖掘和传输率最大限度地得到利用。仿真实验证明了采用碎片合并的方法能有效提取冗余碎片中的有用特征信息,数据挖掘性能得到大幅度提升,在数据信息提取和管理中具有很好的推广意义。 相似文献
6.
研究了VNNTF神经网络交通流量混沌时间序列预测的问题。首先,通过混沌理论提取了交通流量时间序列的混沌特征,并在此基础上建立了VNNTF神经网络交通流量时间序列模型;接着,阐述了VNNTF神经网络学习算法原理．设计了交通流量Voltem神经网络的学习算法快速学习算法：最后利用交通流量混沌时间序列对VNNTF网络模型、Voherra预测滤波器和BP神经网络进行了单步预测,并对预测结果的仿真图和真实值与预测值的方均根进行了比较,结果表明基于混沌学习算法的VNNTF神经网络的预测性能明显优于Volterra预测滤波器和BP神经网络。 相似文献
7.
提出采用残差数据合并技术的冗余数据优化挖掘算法,利用训练集建立决策树模型,引入C4.5决策树模型进行冗余数据主特征建模,在主分量特征决策树下,引入残差数据合并技术,设定数据残差特征伴随追踪模式,把传统方法中用于滤除的数据信息进行拼接伴随追踪定位,实现了冗余数据特征的优化挖掘。把方法应用到网络流量时间序列数据处理中实现网络异常监测,仿真实验表明,新的数据挖掘算法能有效提取到冗余数据特征作为有用检测特征,数据挖掘效率大幅提高,有效促进了海量数据隐藏特征的挖掘和应用,设计的网络流量监测软件能提高网络管理和监测实效性。 相似文献
8.
为克服传统时间序列分析方法对小数据信息数据和非平稳序列检测不稳定的限制,引入滑动窗口模型思想,提出了滑动时间窗口模型的网络流量序列重组空间异构的检测方法。通过计算仿真得到不同时间窗阈值下的网络流量序列递归图,检验出网络总出口流量的确定性。通过提取递归图中异常特征点的定量递归特征的方法实现对流量异常的检测和评估。仿真实验表明,提取的流量序列定量递归特征具有较强的稳定性和自相似性,算法能有效检测出网络流量序列的隐藏异常波,尤其适合于小数据量时间序列和非平稳数据的检测和分析。 相似文献
9.
提出一种基于最大熵功率谱估计的Hadoop云平台下网络音视频数据特征挖掘方法,实现对数据信息的高速访问。构建数据挖掘Hadoop云平台和数据挖掘访问模型,设计最大熵功率谱特征提取算法,采用分段思想将同一时间段的视音频数据进行群体分割,分段提取最大熵功率谱特征。将提取的特征信息进行维度匹配分箱和溯源处理,实现信息恢复,最终完成高速数据访问。仿真测试表明,该算法能有效地实现对网络音视频数据的特征挖掘,提高访问效率,访问响应时间较当前方法缩短明显。 相似文献
10.
《科技通报》2016,(3)
研究多源语义特征分层数据库中的大数据聚类方法,实现数据的分类识别。多源语义特征分层数据库中由于路由冲突,在链路负载较大的情况下,不能有效实现对大数据语义特征的并行搜索。提出一种基于增广链同态解析的链路分流方法避免路由冲突,实现增广链修复下大数据并行搜索聚类。构建大数据聚类的语义相似度融合模型,基于跨层链路分流算法实现增广链路分流,进行语义本体模型构建,选择采用高阶贝塞尔函数累积量作为增广链修复检验统计量,确定节点数据包的置信度,确立置信区间,在进行缓冲区溢出修复时,进行功率谱幅度特征提取,实现大数据的并行搜索聚类,进行语义本体模型构建,为离群点新建一个簇,依次对每个文档的主题词集进行处理,将每个主题词自动添加入形式背景的属性集中,采用并行搜索算法实现对语义大数据的优化聚类算法改进。仿真结果表明,采用该算法进行大数据聚类,契合度较高,误分率较低,性能优越。 相似文献
11.
《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
12.
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
13.
《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
14.
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
15.
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
16.
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
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.
Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献