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王艳兵 《西安文理学院学报》2019,(3)
探讨了无线网络数据流量的建模和预测框架,利用alpha稳定模型对应用程序数据流量进行建模,结果表明了alpha稳定模型能够很好地拟合无线网络中应用程序数据流量.同时,还发现数据流量具有空间上的稀疏性.利用电信服务提供商的真实流量数据集,验证了本文框架对于预测不同类型应用程序数据流量的有效性和健壮性.结果表明,该框架为应用层流量的建模和预测提供了统一的解决方案. 相似文献
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结合本溪"智慧城市"建设的现状,本文提出了建设本溪市云计算数据中心的核心技术,包括数据获取、数据质量分析、数据特征分析、数据预处理和挖掘建模等技术,并在技术分析的基础上提出了挖掘建模的建设方案,同时也提出了建设云计算数据中心所需的配套政策. 相似文献
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三维模型是3D GIS数据的重要组成部分,文中针对目前3D GIS中的主流建模技术进行了综述,阐明了各建模平台的优缺点。通过综合分析,作者总结了各平台的建模侧重点,并指出跨平台3D建模是当前乃至今后建模的一个主流方向。 相似文献
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本文介绍了数据挖掘的定义以及数据挖掘的三个过程:数据预处理、数据建模和评估、模型应用,重点阐述了数据建模的三种主要技术:关联规则、分类和聚类,最后对数据并不能挖掘在科学研究、金融、电信和Internet上的应用进行了论述. 相似文献
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研究了基于CityGML的多层次细节3D城市模型快速建模方法,并将其结合到3DUGIS中用于数字城市建设。建模过程中考虑空间关系、拓扑关系和语义信息,建模过程自动化程度高,能够在三维空间直接进行空间分析,方便海量数据的交换与数据挖掘。并给出了上海世博园区三维信息系统结合具体应用案例。 相似文献
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研究了基于CityGML的多层次细节3D城市模型快速建模方法,并将其结合到3DUGIS中用于数字城市建设。建模过程中考虑空间关系、拓扑关系和语义信息。建模过程自动化程度高,能够在三维空间直接进行空间分析,方便海量数据的交换与数据挖掘。并给出了上海世博园区三维信息系统结合具体应用案例。 相似文献
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Rollnick Marissa Lubben Fred Lotz Sandra Dlamini Betty 《Research in Science Education》2002,32(1):1-18
This study investigates changes in students' understanding of various aspects of measurement before and after participating in two different introductory laboratory courses at two universities in South Africa. Students' ideas were sought using a probe into their understanding of data collection, data processing and data comparison. The responses were analysed using a model which identified subjects as adhering to either a point or set paradigm. Considerable gains were made during instruction with both groups, though some important differences were identified between them. Neither group could be identified after instruction as full adherents to the set paradigm which was a goal of the instruction. Rather, the majority were found to use ad hoc or rote set action, while using point reasoning. 相似文献
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David L. Farnsworth 《Teaching Statistics》2015,37(1):1-6
This article describes a bivariate data set that is interesting to students. Indeed, this particular data set, which involves twins and IQ, has sparked more student interest than any other set that I have presented. Specific uses of the data set are presented. 相似文献
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The primary purpose was to investigate the efficacy of a full year of single‐sex (SS) teaching of science. The secondary aims were to locate any differentiation by set and gender, and to relate these to more proximal variables. Participants were 13 year olds. Higher set girls gave evidence of clear benefits overall, and higher set boys also, except in biology. Lower set pupils performed at or below expectations. Analyses of additional questionnaire and interview data pointed to further reasons for avoiding the making of unqualified generalizations about SS teaching. Pupil preferences for SS teaching were relevant, as were gender differences in attitudes to biology and physics. Qualitative data suggested higher set girls benefited from more learningrelated classroom interaction and less interference and exploitation of girls by boys in SS classes. Lower set pupils complained that SS teaching deprived them of social interaction with the other sex. The concluding suggestion was that SS teaching offers affordances of benefits when mixed‐sex teaching has specifiable disadvantages. 相似文献
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OBJECTIVE: This report describes a method for linking separate confidential data sets that contain personal identifying information while preserving required anonymity. METHODS: Research data were linked with child abuse and neglect (CAN) report data by an independent "safe" analyst using an identical set of unique identifier codes assigned to each case in both data sets after all personal identifiers had been removed. RESULTS: The research team never learned CAN report status of individuals, the state agency never saw the research data, and the desired analyses were completed using the merged data set. CONCLUSIONS: The method was successfully used to merge data from separate sources without divulging confidential information. 相似文献
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符钰 《泰州职业技术学院学报》2011,11(2):67-69
文章从数据挖掘和粗糙集的基本概念出发,研究粗糙集理论在数据挖掘中的典型运用,为大型数据挖掘提供了一种新的方法。基于粗糙集的数据挖掘,首先通过粗糙集理论对数据进行预处理,然后对属性约简,最后进行决策规则提取,寻找最优解。 相似文献
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To meet higher education's challenge of accountability from a customer-satisfaction perspective, one urban institution has developed an integrated approach to studying the freshman-year experience in order to develop comprehensive outcome measures for assessing freshman success. Multiple sources of data (freshman satisfaction survey data, enrollment data, and academic performance data) are integrated into a database that provides the institution with a comprehensive set of outcome indicators and a model of the freshman experience. This institution used the integrated data set to develop models of freshman retention. In order to focus more clearly on customer satisfaction, models of student satisfaction were developed to determine critical components in freshman satisfaction. 相似文献
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针对目前随机产生候选检测器的方式存在亲和度较低的问题。根据克隆选择的原理,对获取的入侵检测数据包进行预处理,对提取的属性采用归一化实数编码,应用混沌原理和抗原的先验知识产生亲和度高的候选检测器集合。根据检测器亲和度的不同,采用了不同的变异算子与进化策略,使算法不仅在保持高检测率下,降低了漏报率,且有效地提高了检测器进化速度。 相似文献
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面向高维数据的聚类分析是当今数据挖掘研究的重要领域,其中的关键问题在于如何对高维数据的聚类结果进行高效率的可视化分析。针对这一问题首先使用了数据聚合树（DA树）作为代表高维数据集的数据结构,并将一个新的聚集算法（CLUK算法）应用于该数据集,获得聚类分析的结果,然后搭建了一个可视化平台（Hvis）,最后利用平行坐标法在... 相似文献
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林路 《邵阳学院学报(社会科学版)》1997,(2)
统计学研究的出发点是数据集D.本文把D纳入线性回归模型M.当D有复共线性现象时,以最小二乘估计为基础的影响分析往往失效,于是,本文探讨以有编估计为基础的影响分析. 相似文献
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4 different procedures are commonly employed with sample data to reduce a set of predictor variables. In the present study these procedures were repeatedly applied to computer-simulated samples to provide comparative data pertaining to two questions: (a) Which procedure can be expected to produce an equation that yields the most accurate predictions for the population? (b) Which procedure is most likely to identify the optimal set of independent variables? The samples were drawn from 12, mathematically defined, multivariate normal populations. Each population consisted of 1 criterion and 10 predictor variables. Five or fewer independent variables constituted the optimal set in each case. With respect to both questions small differences among the procedures were observed. However, the forward selection and stepwise procedures consistently produced more favorable results than the 2 backward elimination procedures. The question of the number of sampling units to use is discussed. 相似文献