Multivariate attribute control chart using Mahalanobis D2 statistic

Process control involves repeated hypothesis testing based on several samples. However, process control is not exactly hypothesis testing as such since it deals with detection of non-random patterns of variation as well in a fleeting kind of population. Compare this with hypothesis testing which is principally meant for a stagnant population. Dr Walter A. Shewhart introduced a graphic method for doing this testing in a fleeting population in 1924. This graphic method came to be known as control chart and is widely used throughout the world today for process management purposes. Subsequently there was much advancement in process control techniques. In particular, when more than one variable was involved, process control techniques were developed mainly by Hicks (1955), Jackson (1956 and 1959) and Montgomery and Wadsworth (1972) based on the pioneering work of Hotelling in 1931. Most of them have worked in the area of multivariate variable control chart with the underlying distribution as multivariate normal. When more than one attribute variables are involved some works relating to test of hypothesis was done by Mahalanobis (1946). These works were also based on the Hotelling T² test. This paper expands the concept of 'Mahalanobis Distance' in case of a multinomial distribution and thereby proposes a multivariate attribute control chart.     

远程教育中网络课程的设计策略

本文在阐述网络教育基本特点的基础上,根据在网上远程教育研究方面的实践体会,提出了网上课程设计的若干原则,并给出了网络课程设计案例。     

浅析放松能力对短距离跑的作用

通过从生理、技术角度分析肌肉放松对短距离跑的作用以及影响短距离跑中放松能力的主要因素,得出加强放松能力的训练对提高短跑运动员的成绩有显著性作用,并提出了一系列与短跑相结合的提高放松能力的训练方法及心理训练方法。     

Minimum Hellinger distance estimators for multivariate distributions from the Johnson system

In this paper, we study minimum Hellinger distance estimators (MHDEs) for multivariate distributions from the Johnson system. We prove some properties of these estimators, such as consistency and asymptotic normality, and show that they represent a robust alternative for other existing estimators.     

考虑环境因素的陕西省制造业绩效研究

在评价制造业绩效时,环境因素是一个要考虑的影响因子。基于方向性环境距离函数,选取陕西省不同要素密集行业2005—2011年数据,比较了考虑环境因素和不考虑环境因素两种情形下的陕西省制造业绩效。研究发现,考虑CO2排放后制造业在生产前沿上的行业数目减少,陕西省制造业的整体绩效不高且规模收益总体上呈递减趋势;技术密集型制造业的平均绩效最高,主要是技术进步较快所致,劳动密集型行业绩效主要依赖规模效率变化的推动,而资本密集型行业绩效的"追赶效应"最为明显;大多数劳动、资本密集型行业表现出技术退步趋势,"前沿面移动效应"不明显,企业管理水平不高,投入结构有待优化,技术进步缓慢。针对研究结果最后提出了相应的对策建议。     

Testing Semiparametric Hypotheses in Locally Stationary Processes

In this paper, we investigate the problem of testing semiparametric hypotheses in locally stationary processes. The proposed method is based on an empirical version of the L₂‐distance between the true time varying spectral density and its best approximation under the null hypothesis. As this approach only requires estimation of integrals of the time varying spectral density and its square, we do not have to choose a smoothing bandwidth for the local estimation of the spectral density – in contrast to most other procedures discussed in the literature. Asymptotic normality of the test statistic is derived both under the null hypothesis and the alternative. We also propose a bootstrap procedure to obtain critical values in the case of small sample sizes. Additionally, we investigate the finite sample properties of the new method and compare it with the currently available procedures by means of a simulation study. Finally, we illustrate the performance of the new test in two data examples, one regarding log returns of the S&P 500 and the other a well‐known series of weekly egg prices.     

敞开的痴迷与纠缠--博尔赫斯小说结构在格非短篇创作中的延伸

博尔赫斯小说结构在格非短篇创作中有3个方面的延伸一是时间,小说所呈现的"循环型(圆型)结构"把我们带入了对于时间与幻象的痴迷;二是镜子与迷宫,它们生成了无限繁殖与无限增生的文学意象,虚构了想象世界与现实利益之间的模糊,由此也成为结构小说的内在核心,并为文本的多重意蕴提供了潜在的无限阐释的多重可能;三是空间距离,对原先文本或知识的改写,成为这种距离叙述的主要表现方式,它在一定程度上又拉近了与读者期待视野之间的距离,形成所谓"文本的文本"、"叙述的叙述"式的"幻想小说"叙述结构.     

远程开放教育管理类课程教学模式改革与实践

探讨了"以学生为主体、以教师为主导、以学生自主探究为主线"的网络环境下的远程开放教育管理类课程"双主体--探究式"教学模式,就是将现代信息技术与课程加以整合,培养学习者的创新意识、创新精神、创新能力和解决实际问题的能力。     

基于灰色关联度和理想解法的决策方法研究

引入灰色系统理论对传统理想解法(TOPSIS)进行了拓展,提出了一种基于灰色关联度和理想解法(TOP-SIS)的决策方法。该方法将欧氏距离和灰色关联度有机结合,构造了一种新的相对贴近度以实现对方案的评价。新贴近度同时反映了方案与理想方案和负理想方案之间的位置关系和数据曲线的相似性差异,物理含义更加明确。最后通过一个供应商选择的示例进一步说明了方法的应用步骤。     

我院通信改造及设备选用

本文针对我院通信改造中存在的问题,提出了解决传输的办法及新设备的选用。