特征AHP在高校教师教学质量评定中的应用

本文针对高校教师教学质量的评定提出了一种特征层次分析法。首先通过分析教学质量的影响因素,建立三层层次分析模型。在其基础上引入特征法,选取特征群并确定特征群中个体的权重,利用反算法根据组合权重及方案层权重,求取准则层评定指标权重,避免了不同质指标间对比的不确定性,摒除了专家直接给出评定指标对比矩阵的主观性,减少了对教师评定过程的不一致性和不完备性。     

Opportunities for woman-initiated HIV prevention methods among female sex workers in southern China

Rapid changes in China over the past two decades have led to significant problems associated with population migration and changing social attitudes, including a growing sex industry and concurrent increases in STIs and HIV. This article reports results of an exploratory study of microbicide acceptability and readiness and current HIV prevention efforts among female sex workers in two rural and one urban town in Hainan and Guangxi Provinces in southern China. The study focused on these women's knowledge and cultural understandings of options for protecting themselves from exposure to STIs and HIV, and the potential viability and acceptability of woman-initiated prevention methods. We report on ethnographic elicitation interviews conducted with women working within informal sex-work establishments (hotels, massage and beauty parlors, roadside restaurants, boarding houses). We discuss implications of these findings for further promotion of woman-initiated prevention methods such as microbicides and female condoms among female sex workers in China.     

歌声传友谊——广州中华文化合唱团海外文化交流的体会

本文回顾了广州中华文化合唱团成立以来从事海外文化交流工作的九年历程,总结了通过合唱艺术广交天下朋友的心得与体会.     

现代性与当代审美文化的结构

当代审美文化的结构性生成是在现代性进程中发生的。我们可以用“生活/艺术”、“大众/精英”、“保守/前卫”这三对范畴来描述当代审美文化的内部结构。值得注意的是,在事实性的领域中这三对范畴之间的斜线(/)不是断然明确而固定不变的,正是这条斜线的颤动、扭曲、变化甚至消失和再生,标志着当代审美文化活生生的生命存在与运动。     

Variance estimation based on blocked 3×2 cross-validation in high-dimensional linear regression

In high-dimensional linear regression, the dimension of variables is always greater than the sample size. In this situation, the traditional variance estimation technique based on ordinary least squares constantly exhibits a high bias even under sparsity assumption. One of the major reasons is the high spurious correlation between unobserved realized noise and several predictors. To alleviate this problem, a refitted cross-validation (RCV) method has been proposed in the literature. However, for a complicated model, the RCV exhibits a lower probability that the selected model includes the true model in case of finite samples. This phenomenon may easily result in a large bias of variance estimation. Thus, a model selection method based on the ranks of the frequency of occurrences in six votes from a blocked 3×2 cross-validation is proposed in this study. The proposed method has a considerably larger probability of including the true model in practice than the RCV method. The variance estimation obtained using the model selected by the proposed method also shows a lower bias and a smaller variance. Furthermore, theoretical analysis proves the asymptotic normality property of the proposed variance estimation.     

An elastic-net penalized expectile regression with applications

To perform variable selection in expectile regression, we introduce the elastic-net penalty into expectile regression and propose an elastic-net penalized expectile regression (ER-EN) model. We then adopt the semismooth Newton coordinate descent (SNCD) algorithm to solve the proposed ER-EN model in high-dimensional settings. The advantages of ER-EN model are illustrated via extensive Monte Carlo simulations. The numerical results show that the ER-EN model outperforms the elastic-net penalized least squares regression (LSR-EN), the elastic-net penalized Huber regression (HR-EN), the elastic-net penalized quantile regression (QR-EN) and conventional expectile regression (ER) in terms of variable selection and predictive ability, especially for asymmetric distributions. We also apply the ER-EN model to two real-world applications: relative location of CT slices on the axial axis and metabolism of tacrolimus (Tac) drug. Empirical results also demonstrate the superiority of the ER-EN model.     

时光·梦想

生活在19世纪的人们,乐于听到工业革命的轰鸣声。他们知道,这是“现代”的召唤。21世纪的我们,现代的我们则渴望着回到自然的怀抱。这是文明的又一道曲线。它从一个欣欣向荣滑到另一个欣欣向荣。而这两个时代都打上了进步的鲜明烙印,都同样是我们光荣的、关于自身、关于梦想的珍贵记忆。如果好奇于日常生活中的周遭事务,并执着于探求它们的来源,我们会惊奇地发现:时常光顾的超市、购物中心、度假村、俱乐部,始于世界博览会;电视机、留声机、电灯,在世博会上首次展出;甚至第一台纺织机、第一架飞机竟也是从世博会步入我们的生活。“一切始于…     

Bayesian nonparametric modelling of the link function in the single-index model using a Bernstein–Dirichlet process prior

This paper proposes the use of the Bernstein–Dirichlet process prior for a new nonparametric approach to estimating the link function in the single-index model (SIM). The Bernstein–Dirichlet process prior has so far mainly been used for nonparametric density estimation. Here we modify this approach to allow for an approximation of the unknown link function. Instead of the usual Gaussian distribution, the error term is assumed to be asymmetric Laplace distributed which increases the flexibility and robustness of the SIM. To automatically identify truly active predictors, spike-and-slab priors are used for Bayesian variable selection. Posterior computations are performed via a Metropolis-Hastings-within-Gibbs sampler using a truncation-based algorithm for stick-breaking priors. We compare the efficiency of the proposed approach with well-established techniques in an extensive simulation study and illustrate its practical performance by an application to nonparametric modelling of the power consumption in a sewage treatment plant.     

Resolving Rabin’s paradox

We present a theoretical model of Rabin’s famous calibration paradox that resolves confusions in the literature and that makes it possible to identify the causes of the paradox. Using suitable experimental stimuli, we show that the paradox truly violates expected utility and that it is caused by reference dependence. Rabin already showed that utility curvature alone cannot explain his paradox. We, more strongly, do not find any contribution of utility curvature to the explanation of the paradox. We find no contribution of probability weighting either. We conclude that Rabin’s paradox underscores the importance of reference dependence.

     

产城融合发展与城镇化效率提升的互动机制及实现途径

产城融合发展与城镇化效率提升作为新型城镇化进程中的重要问题备受关注,而如何实现二者的互动则更为重要,这关系未来我国城镇化整体的运行质量。基于此,笔者通过对产城融合发展与城镇化效率提升的互动机制进行诠释,从有产无城与城镇化高成本并存、有城无产与城镇化低收益并存、产城割裂与城镇化低效率并存三大层面分析了产城融合发展与城镇化效率提升相互影响中的突出问题,并据此提出加大产业结构转型升级,增强城镇化经济力,完善城镇配套功能,鼓励发展新兴产业及强化城镇化中的市场化建设等实现产城融合发展与城镇化效率提升的互动实现途径。