Some results on optimality in models with heteroscedastic errors from partial optimum designs

This paper studies optimum designs for linear models when the errors are heteroscedastic. Sufficient conditions are given in order to obtainD-, A- andE-optimum designs for a complete regression model from partial optimum designs for some sub-parameters. A result about optimality for a complete model from the optimality for the submodels is included. Supported by Junta de Andalucía, research group FQM244.     

轻声的作用与语音修饰

作为一种重要的语音现象，仅从可区别词义及词性来解释轻声的存在因由是不能令人信服的。轻声在语流中的语音修饰作用所带给我们的审美感受使得它的存在有理有据。     

大学英语语调交际功能的课堂教学研究与实践

大学英语课堂教学不能只注意学生英语语音，更重要的是在语音的基础上掌握语调及其功能。从学生语言运用能力的角度来说语调的教学比纯语音教学应该更重要，因为同一个单词或句子用不同的语调在同等交际背景下传递出的含义就会不同，有时还会是相反的含义。以语调的交际功能为出发点，运用语用学的相关理论，设计并分析了基于语调交际功能的英语课堂教学模式的实践，探讨了这种模式的可行性和有效性，以引起大家对语调教学的重新思考。     

Domains of convergence for the EM algorithm: a cautionary tale in a location estimation problem

The EM algorithm is a popular method for maximizing a likelihood in the presence of incomplete data. When the likelihood has multiple local maxima, the parameter space can be partitioned into domains of convergence, one for each local maximum. In this paper we investigate these domains for the location family generated by the t-distribution. We show that, perhaps somewhat surprisingly, these domains need not be connected sets. As an extreme case we give an example of a domain which consists of an infinite union of disjoint open intervals. Thus the convergence behaviour of the EM algorithm can be quite sensitive to the starting point.     

情商在体育教学中的作用

学校体育教学的现状与时代的要求尚有一定距离,体育教学的改革势在必行。阐述情商EQ在体育教学中所起的作用。     

论《周易》中圣人崇拜思想及影响

《周易》的圣人崇拜思想 ,既有积极作用 ,更多的是消极作用 ,必须在新时代加以转换     

科学执政、民主执政中的依法执政基本途径

依法执政或依法行政,作为执政方式最为直接、最为具体的基本实践环节或途径,在相当范围内反映着科学执政、民主执政的实现程度。这取决于《行政许可法》不打折扣地坚决实施,政府的依法执政职能方式从重管制向重服务转变;职能范围从“全能”向“有限”回归;职能性质由“专断”走向真正“民主”;职能习惯从主观随意转向严格的法治。     

信息不对称与人的经济行为

信息不对称及其经济效应是信息经济学研究的中心问题,本文依据信息经济学和行为科学理论,从现实经济生活出发,系统地阐述了信息不对称的内涵,论证了信息不对称的必然性,探讨了信息不对称条件下交易双方的经济行为,提出了信息不对称条件下卖方(或代理方)违规败德行为的函数式,最后讨论了信息不对称造成的经济后果,提出了解决这一问题的思路。     

二项式函数在组合恒等式证明中的应用

一些恒等式在函数论、组合数学、解析数论等学科的研究领域中极为重要。以二项式作为生成函数,给出了几个组合恒等式证明。     

Semiparametric linear transformation models for current status data

Current status data arise when the death of every subject in a study cannot be determined precisely, but is known only to have occurred before or after a random monitoring time. The authors discuss the analysis of such data under semiparametric linear transformation models for which they propose a general inference procedure based on estimating functions. They determine the properties of the estimates they propose for the regression parameters of the model and illustrate their technique using tumorigenicity data.