Quantile regression for robust estimation and variable selection in partially linear varying-coefficient models

In this paper, we develop a new estimation procedure based on quantile regression for semiparametric partially linear varying-coefficient models. The proposed estimation approach is empirically shown to be much more efficient than the popular least squares estimation method for non-normal error distributions, and almost not lose any efficiency for normal errors. Asymptotic normalities of the proposed estimators for both the parametric and nonparametric parts are established. To achieve sparsity when there exist irrelevant variables in the model, two variable selection procedures based on adaptive penalty are developed to select important parametric covariates as well as significant nonparametric functions. Moreover, both these two variable selection procedures are demonstrated to enjoy the oracle property under some regularity conditions. Some Monte Carlo simulations are conducted to assess the finite sample performance of the proposed estimators, and a real-data example is used to illustrate the application of the proposed methods.     

Mini-max-risk and mini-mean-risk inferences for a partially piecewise regression

We consider a partially piecewise regression in which the main regression coefficients are constant in all subdomains, but the extraessential regression function is variable in different pieces and is difficult to be estimated. Under this situation, two new regression methodologies are proposed under the criteria of mini-max-risk and mini-mean-risk. The resulting models can describe the regression relations in maximum-risk and mean-risk environments, respectively. A two-stage estimation procedure, together with a composite method, is introduced. The asymptotic normality of the estimators is established, the standard convergence rate and efficiency are achieved. Some unusual features of the new estimators and predictions, and the related variable selection are discussed for a comprehensive comparison. Simulation studies and a real-financial example are given to illustrate the new methodologies.     

Precise large deviations for φ-mixing and UND random variables with long-tailed distributions

In this paper, we investigate the precise large deviations for sums of φ-mixing and UND random variables with long-tailed distributions. The asymptotic relations for non random sum and random sum of random variables with long-tailed distributions are obtained.     

Stereotype and National Attachment in Hong Kong Chinese Context: A Moderated Mediation Model of Perceived Inter-group Relationship and Age

The present study investigated the relationship between Hong Kong people’s stereotype toward Mainland people and their own national attachment (i.e., national identity, constructive patriotism, and uncritical patriotism). The role of inter-group relationship as mediator and age as moderator of that relationship were also tested. A total of 1753 local Hong Kong people aged 17–80 (mean age = 20.35 years, SD = 5.02) completed anonymous questionnaires regarding their stereotypes toward Mainland people, inter-group relationship with Mainland people, and national attachment. As expected, stereotypes toward Mainland people, inter-group relationship and national attachment showed significant positive associations with each other. More interestingly, it was found that the inter-group relationship mediated the relationship between stereotypes toward Mainland people and three domains of national attachment, with this indirect link being weaker for younger Hong Kong adults than for older Hong Kong adults. Implications of the present findings for future research are discussed, as well as potential interventions for increasing subjective national attachment to China, especially in young Hong Kong people.     

Characteristics of atmospheric PM2.5 in stands and non-forest cover sites across urban-rural areas in Beijing,China

Urban Ecosystems - Monitoring air pollution at a city scale is essential for controlling urban air pollution in cities, especially megacities, in China. In this paper, data for 1 city center site...     

“BOT+TOD”轨道交通投融资模式初探——以佛山市地铁二号线为例

近年来,我国城市轨道交通进入快速发展阶段,城市轨道交通的快速发展需要巨大的资金支撑,传统城市轨道交通投融资方式已经难以为继。本文从城市轨道交通TOD发展模式出发,分析"BOT+TOD"投融资模式的特点及其总体方案,并且以佛山市地铁二号线为例,提出"BOT+TOD"的具体实施路径与操作方法,为市政公用基础设施投融资体制改革、创新轨道交通投融资模式、土地管理制度的改革提供借鉴。通过此创新投融资模式在我国城市轨道交通中的成功运用,改善融资困难局面,促进我国城市轨道交通持续快速发展。     

Ergonomics and design: traffic sign and street name sign

This work proposes a design methodology using ergonomics and anthropometry concepts applied to traffic sign and street name sign projects. Initially, a literature revision on cognitive ergonomics and anthropometry is performed. Several authors and their design methodologies are analyzed and the aspects to be considered in projects of traffic and street name signs are selected and other specific aspects are proposed for the design methodology. A case study of the signs of "Street of Antiques" in Porto Alegre city is presented. To do that, interviews with the population are made to evaluate the current situation of signs. After that, a new sign proposal with virtual prototyping is done using the developed methodology. The results obtained with new interviews about the proposal show the user satisfaction and the importance of cognitive ergonomics to development of this type of urban furniture.     

“新市民”文化建设的问题分析及对策探究

我国正在以前所未有的速度进行着城市化,在这个过程中,越来越多的农民通过城市就业逐步转化为新市民,他们在享受城市化生活的同时也面临了许多困境,在文化方面的问题尤其突出。本文将主要分析这部分新市民的城市归属感、子女教育、现代化市民教育和文化生活孤岛化等四个问题,并提出相应的五个对策以加快推进新市民文化建设。     

壮族复式思维句式英译研究——以壮族创世史诗《布洛陀》为例

本文认为壮族人民行文说话有复式思维的特点,比较分析汉壮民族的复式思维句式与英语民族的直线思维句式之差异,认为壮族创世史诗<布洛陀>的文体结构最大特点是骗偶重述句式,并举例说明壮族文化典籍中骈偶重述句式的三种英译方法.     

“中国梦”语境下青年价值观的整合

中国正处于社会发展与转型的快速时期,青年价值观呈现出前所未有的多元化态势。青年价值观的整合,需要多维的视角,而"中国梦"的提出,则为青年价值观的整合提供了现实的途径。作为主导价值观的表现,"中国梦"可以引导青年自觉地将个人发展与国家富强、民族复兴结合起来,从而达到青年价值观整合的目的。青年应在"中国梦"的引领下,成为身负责任感和使命感的社会发展的中坚力量。