A GENERALIZED EMERSON RECURRENCE RELATION

The Emerson (1968, Biometrics 24 , 695–701) recurrence relation has many important applications in statistics. However, the original derivation applied only to discrete distributions. In the following, a simple derivation is given that generalizes the Emerson recurrence relation to any distribution for which the necessary expectations exist. A modern application is outlined.     

Estimation of scale parameters in mixture distributions

Simultaneous estimation of scale parameters is considered in mixture distributions under squared-error loss. A general class of estimators is obtained which dominates the componentwise best multiple estimators and the moment estimators. As special cases, improved estimators are obtained for the multivariate t-distribution and the p-variate Lomax distribution.     

De-aliasing effects using semifoldover techniques

Semifoldover designs, obtained by semifolding a regular two-level factorial design, have been discussed recently in the literature. In this article, with the use of indicator functions, we investigate various semifoldover designs that are obtained from a general two-level factorial design. We discuss when a main factor or a two-factor interaction can be de-aliased from their aliased two-factor interactions, and extend some of the existing results from regular designs to non-regular designs. Finally, we present some examples to illustrate the results developed here.     

科学发展观与建构和谐教育

由于科学发展观的价值取向是以人为本,和谐教育的根本目标是人的全面发展,二者必然统一于人的全面而自由的发展,从而提出从法治教育、素质教育两个方面实现人的全面而自由发展的观点。     

Proof of Toft's Conjecture: Every Graph Containing No Fully Odd K4 is 3-Colorable

A fully odd K₄ is a subdivision of K₄ such that each of the six edges of the K₄ is subdivided into a path of odd length. In 1974, Toft conjectured that every graph containing no fully odd K₄ can be vertex-colored with three colors. The purpose of this paper is to prove Toft's conjecture.     

“效率优先,兼顾公平”究竟错在哪里

在特定的历史时期,“效率优先,兼顾公平”的提法对于破除计划经济体制和平均主义观念起了积极的作用。随着中国发展进程的推进,这一提法逐渐显露出其明显的局限性,主要表现在:同以人为本的基本理念相抵触;没有区分基本制度和具体政策2个层面的公正问题;与和谐社会建设格格不入;将这一提法泛化并覆盖非经济领域;意味着现代政府主要职能的错位;对初次分配重效率、再次分配重公平的定位有误。从长远看,这一提法对中国社会经济的发展会产生广泛的负面影响:对现代社会的制度建设不利;对改革和发展的有机统一不利;对公正合理的社会结构的形成不利;延缓了合理、健全的社会政策的制定。正确的提法应当是:以社会公正为基本理念和基本准则,促进社会经济的协调发展,促进改革开放和现代化建设的整体化推进,促进和谐社会的建设。     

NONPARAMETRIC AUTOCOVARIANCE FUNCTION ESTIMATION

Nonparametric estimators of autocovariance functions for non-stationary time series are developed. The estimators are based on straightforward nonparametric mean function estimation ideas and allow use of any linear smoother (e.g. smoothing spline, local polynomial). The paper studies the properties of the estimators, and illustrates their usefulness through application to some meteorological and seismic time series.     

晶闸管改进型桥式变流器的双重化研究

提出具有功率因数改善的改进型桥式变流器的一种双重化方案，对其换流过程和工作情况进行了分析，导出了数学模型及保证安全换流的最小逆变角，并与通常的12脉波桥式变流器进行了比较．     

基于谐波消除PWM的RMOS逆变器的研制

根据规则采样ＰＷＭ的谐波消除原理，提出了一种适于单片机实现的三相ＰＷＭ算法，并用新型功率器件ＲＭＯＳ研制出谐波消除ＰＷＭ逆变器，通过仿真分析和实际运行验证了ＰＷＭ中的谐波消除效果。     

弱位相光栅的自成像研究

本文从理论上对球面波照明弱位相光栅时的自成像现象进行了研究，发现当相对位相分布（x）＜＜1弧度时，位相光栅也存在自成像现象。