高等师范院校推行顶岗实习的实践意义

近年来,高校师范生顶岗实习作为改革教师教育的一项战略性重要举措备受关注。顶岗实习既是高校师范教育的需要,也是培养师范生四种能力的有效途径,同时也使贫困地区的基础教育获得持续的、较高水准的师资补充。顶岗实习是一项"顶岗学生、师范院校、实习学校"三方共赢的系统工程,具有十分重要的现实意义。     

论民办本科高校面向市场增强核心竞争力的途径——以黄河科技学院为例

民办高校的核心竞争力，是以自身拥有的资源和能力为基础，获得持续竞争优势的能力，这种能力决定民办高校的前途命运。民办高校若要增强核心竞争力，应走差异化发展道路。实施特色品牌发展战略，寻找适应市场需求的新发展空间。占据市场竞争的有利位置，走上可持续发展的康庄大道。具体可从选拔与培养优秀校长、增强特色办学理念、建设高素质教师队伍、建立良好的内部管理与运行机制、探索人才最佳培养模式五种途径着手，增强民办高校的核心竞争力。     

A note on a by-claim risk model: Asymptotic results

In this note, we restudy a by-claim risk model with general dependence structures between each main claim and its by-claim. Within the framework of regular variation, we derive some asymptotic expansions for the infinite-time and finite-time ruin probabilities.     

台湾小学融合教育班级之教师教学困扰探究——南投县小学普通班教师教学困扰调查

为了探讨台湾小学教师对实施融合教育的教学困扰情况,我们以南投县小学普通班教师为研究对象进行问卷调查。调查显示:南投县小学普通班教师实施融合教育的教学困扰情形属于中等程度;教学困扰各层面由高而低的顺序为:"课程教学"最高,"专业知能"与"教室管理"居次,"支持系统"最低;教导班上学生障碍程度不同的教师,整体教学困扰有显著差异;在"专业知能"层面,学生障碍程度为中度的教师教学困扰较高。     

Robustness group divisible designs

Robustness of group divisible (GD) designs is investigated, when one block is lost, in terms of efficiency of the residual design. The exact evaluation of the efficiency can be made for singular GD and semi-regular GD designs as ell as regular GD designs with λ₁ = 0. In a regular GD design with λ₁ > 0, the efficiency may depend upon the lost block and sharp upper and lower bounds on the efficiency are presented. The investigation shows that GD designs are fairly robust in terms of efficiency. As a special case, we can also show the robustness of balanced incomplete block design when one block is lost.     

A Class of Pseudolikelihood Ratio Tests for Homogeneity in Exponential Tilt Mixture Models

Mixture models are commonly used in biomedical research to account for possible heterogeneity in population. In this paper, we consider tests for homogeneity between two groups in the exponential tilt mixture models. A novel pairwise pseudolikelihood approach is proposed to eliminate the unknown nuisance function. We show that the corresponding pseudolikelihood ratio test has an asymptotic distribution as a supremum of two squared Gaussian processes under the null hypothesis. To maintain the appeal of simplicity for conventional likelihood ratio tests, we propose two alternative tests, both shown to have a simple asymptotic distribution of under the null. Simulation studies show that the proposed class of pseudolikelihood ratio tests performs well in controlling type I errors and having competitive powers compared with the current tests. The proposed tests are illustrated by an example of partial differential expression detection using microarray data from prostate cancer patients.     

Truncated regular vines in high dimensions with application to financial data

Using only bivariate copulas as building blocks, regular vine copulas constitute a flexible class of high‐dimensional dependency models. However, the flexibility comes along with an exponentially increasing complexity in larger dimensions. In order to counteract this problem, we propose using statistical model selection techniques to either truncate or simplify a regular vine copula. As a special case, we consider the simplification of a canonical vine copula using a multivariate copula as previously treated by Heinen & Valdesogo ( 2009 ) and Valdesogo ( 2009 ). We validate the proposed approaches by extensive simulation studies and use them to investigate a 19‐dimensional financial data set of Norwegian and international market variables. The Canadian Journal of Statistics 40: 68–85; 2012 © 2012 Statistical Society of Canada     

普通院校“机械类”专业毕业设计存在的问题与对策

文章阐述了毕业设计在人才培养方面的重要作用,指出普通院校“机械类”专业毕业设计存在的问题,提出了改善毕业设计题目的合理性、充分调动学生的积极性、提高教师的业务素质与责任心、严格控制毕业设计成绩等对策。通过实践,学生完成毕业设计的积极性明显提高,毕业设计质量也有较大提高。     

Conditional Extremes in Asymmetric Financial Markets

ABSTRACT

The global financial crisis of 2007–2009 revealed the great extent to which systemic risk can jeopardize the stability of the entire financial system. An effective methodology to quantify systemic risk is at the heart of the process of identifying the so-called systemically important financial institutions for regulatory purposes as well as to investigate key drivers of systemic contagion. The article proposes a method for dynamic forecasting of CoVaR, a popular measure of systemic risk. As a first step, we develop a semi-parametric framework using asymptotic results in the spirit of extreme value theory (EVT) to model the conditional probability distribution of a bivariate random vector given that one of the components takes on a large value, taking into account important features of financial data such as asymmetry and heavy tails. In the second step, we embed the proposed EVT method into a dynamic framework via a bivariate GARCH process. An empirical analysis is conducted to demonstrate and compare the performance of the proposed methodology relative to a very flexible fully parametric alternative.     

规则框架的一种实用简化计算方法

近年来，钢筋混凝土框架结构的应用越来越广泛，在一般工业与民用建筑中，规则框架所占的比例很高，因此合理解决规则框架的简化计算有较大的意义．本文所介绍的规则框架的简化计算方法，对工程实际具有一定的指导意义．