基于数据驱动原理的新型计算机系统结构的可行性分析

本文通过对传统的基于存储程序原理的冯·诺依曼计算机和基于数据驱动原理的新型计算机系统结构的数据流计算机的比较以及对数据流计算机的性能的分析,得出这种还处在萌芽阶段的数据流计算机是可行的,也是具有发展潜的.     

基于LabVIEW的振动实验控制与数据采集系统

开发了一种基于虚拟仪器的振动实验控制与数据采集系统，对机械振动信号进行实时的数据采集处理、波形显示、信号存储、信号分析以及再现。利用LabVIEW的CLF节点词用动态链接库驱动并控制运动控制卡，通过虚拟面板对振动实验台的数字伺服电机进行自动控制进而达到控制实验台的运转目的。系统具有简洁友好的人机界面，直接在软面板上完成各种操作。     

基于MDF-Nearest算法的轨迹隐私保护方法

传统轨迹匿名方法在匿名集生成时没有考虑用户多种特征属性,在信息攻击下无法有效保护真实位置;在轨迹形成方面因没有将余弦角度和轨迹间距离作为形成的依据,导致某些虚假轨迹无法有效保护真实轨迹。为改善以上问题,构建一种依据用户多重特征信息构建的匿名集以保证匿名有效性;采用协作用户的真实轨迹并计算相似性,从而生成虚假轨迹相似性高的MDF-Nearest算法。实验结果表明,该方法随着k值的变大与生成轨迹数量的增多,隐私保护效果逐渐改进;与传统k匿名方法相比,该算法时间开销降低41.7%,而隐私保护程度可提高至97.1%。因此该方法能以较低的时间开销,提供质量可靠的位置服务,保护用户信息。     

灰色马尔科夫模型在高校招生中的应用研究

本研究深入剖析了灰色马尔科夫模型在高校招生中的应用,由于高校生源变动的随机性、波动性以及复杂性,给招生预测工作带来了很多瓶颈。为了更准确地预测招生人数,我们将试图把灰色动态预测与马尔科夫预测模型融为一体,对高校招生人数进行预测。选取河南师范大学部分新生历年录取入学情况为研究对象,采用数据收集法、实验分析法、灰色马尔科夫模型等技术发掘数据中隐藏的规律和模式,从而为高校招生工作提供科学的依据。     

Examining Intermediate Omitted Levels in Hierarchical Designs via Latent Variable Modeling

This article outlines an interval estimation procedure that can be used in a 3-level setting to evaluate the proportion of outcome variance attributable to the second level of clustering. The method is useful for examining the necessity of including a possibly omitted intermediate level of nesting in analyses of data from a multilevel study, and represents an informative addendum to current statistical tests of second-level variance. The approach is developed within the framework of latent variable modeling and can be used as an aid in the process of choosing between 2-level and 3-level models in a hierarchical design. The discussed procedure is illustrated with an empirical example.     

Making sense of learner and learning Big Data: reviewing five years of Data Wrangling at the Open University UK

Most distance learning institutions collect vast amounts of learning data. Making sense of this ‘Big Data’ can be a challenge, in particular when data are stored at different data warehouses and require advanced statistical skills to interpret complex patterns of data. As a leading institute on learning analytics, the Open University UK instigated in 2012 a Data Wrangling initiative. This provided every Faculty with a dedicated academic with expertise data analysis and whose task is to provide strategic, pedagogical and sense-making advice to staff and senior management. Given substantial changes within the OU (e.g. new Faculty structure, real-time dashboards, two large-scale adoptions of predictive analytics approaches, increased reliance on analytics), this embedded case study provides an in-depth review of lessons learned of five years of data wrangling. We will elaborate on the design of the new structure, its strengths and potential weaknesses, and affordances to be adopted by other institutions.     

谈多重复句分析

多重复句分析主要包括两个方面内容 :一是结构层次的确定 ,二是逻辑关系的把握。无论哪一方面的分析 ,都应有规律可寻。抓住关联词语是解决问题的有效途径 ,看划开之后各部分是否具有相对完整性和换位后能否成立是检查层次划分正确与否的有效手段。     

How to measure research efficiency in higher education? Research grants vs. publication output

An ongoing debate in the literature on the efficiency of higher education institutions concerns the indicator for research output for use in empirical analysis. While several studies have chosen to use the number of publications as this indicator, others rely on the amount of research grants. The present study investigates whether both measures lead to a similar assessment of universities. In addition, the number of publications belonging to the 10% and 1% most frequently cited papers in the corresponding subject category and publication year are evaluated. We show that there is a high correlation of efficiency values between the estimations using these indicators. This correlation is slightly higher when the efficiency values result from a data envelopment analysis than when they are determined with a stochastic frontier analysis. The results of this study provide helpful guidelines for researchers evaluating the efficiency of universities and are valueable for decision-makers in science policy.     

科学计算中辅助技术探讨

科学计算中辅助技术是计算机科学发展到一定阶段而提出的一个很有实际意义的课题．本文针对科学计算过程探讨了工程数据库技术和可视计算技术     

线性网络幅频特性的自动测量

介绍了利用精密二极管检波测量线性阻抗网络幅频特性的方法以及由计算机数据采集系统组成的自动测量装置，数据测量结果分析表明，该方法的测量误差在3％以内。完全可代替常规的交流测量法，该方法配合高稳定性、快速跟踪的压控振荡器VCO可实现宽频范围内的快速扫频自动测量。