Deterministic versus stochastic seasonal fractional integration and?structural breaks

This paper considers a general model which allows for both deterministic and stochastic forms of seasonality, including fractional (stationary and nonstationary) seasonal orders of integration, and also incorporating endogenously determined structural breaks. Monte Carlo analysis shows that, in the case of a single break, the suggested procedure performs well even in small samples, accurately capturing the seasonal properties of the series, and correctly detecting the break date. As an illustration, the model is estimated using four US series (output, consumption, imports and exports). The results suggest that the seasonal patterns of these variables have changed over time: specifically, in the second subsample the systematic component of seasonality becomes insignificant, whilst the degree of persistence increases.     

Multilevel Determinants of Colleges/Universities Enrolment in Vietnam: Evidences from the 15% Sample Data of Population Census 2009

In an increasingly knowledge-based globalized world, higher education, advanced training and skill development are critical priorities for Vietnam. This paper aims to estimate the participation in higher education and its regional distribution in Vietnam, and to identify its determinants at the individual and contextual levels. Data used were from Vietnam Population and Housing Census 2009 linked with Vietnam living standard survey 2009. The participation rate overall in the colleges/universities among 19–22 year olds in Vietnam was 16.3%, but this rate varied significantly across the provinces. Household socioeconomic status, gender, ethnic group, migrant status, and urban/rural residence were significant individual level predictors of participation while indicator of fertility stabilization, income distribution, and average education level were significant predictors at the contextual (provincial) level. The results show that individual, social and regional inequalities are important impediments to higher education participation among the Vietnam youth. The government needs to pay more attention to promoting higher education and training in order to position Vietnam in the global economy.     

媒体监督公司治理的实证研究

随着国内改革环境的逐步宽松和市场竞争的加剧,为了赢得社会声誉和获得商业利益,媒体有动力去监督公司中存在的治理问题。在本文所选取的96个研究样本中,60.42%存在公司治理问题的企业都在证监会正式介入调查前受到过媒体的质疑和负面报道,说明媒体并非事前"缄默无语"、事后"言辞铿锵",而是积极地扮演了资本市场监督者的角色;基于成本与收益的权衡考虑,媒体会选择性质严重和涉及金额大的公司治理问题进行负面报道。本文的研究结论一方面为媒体在转型经济国家发挥公司治理监督者的作用提供了证据,另一方面也分析了在法律制度和市场化尚不完善的情况下,影响媒体发挥监督作用的因素,依此提出了若干政策建议。     

A SAEM algorithm for the estimation of template and deformation parameters in medical image sequences

This paper is about object deformations observed throughout a sequence of images. We present a statistical framework in which the observed images are defined as noisy realizations of a randomly deformed template image. In this framework, we focus on the problem of the estimation of parameters related to the template and deformations. Our main motivation is the construction of estimation framework and algorithm which can be applied to short sequences of complex and highly-dimensional images. The originality of our approach lies in the representations of the template and deformations, which are defined on a common triangulated domain, adapted to the geometry of the observed images. In this way, we have joint representations of the template and deformations which are compact and parsimonious. Using such representations, we are able to drastically reduce the number of parameters in the model. Besides, we adapt to our framework the Stochastic Approximation EM algorithm combined with a Markov Chain Monte Carlo procedure which was proposed in 2004 by Kuhn and Lavielle. Our implementation of this algorithm takes advantage of some properties which are specific to our framework. More precisely, we use the Markovian properties of deformations to build an efficient simulation strategy based on a Metropolis-Hasting-Within-Gibbs sampler. Finally, we present some experiments on sequences of medical images and synthetic data.     

论江泽民对邓小平小康思想的继承和发展

党的十六大确立了全面建设小康社会的目标 ,描绘了 2 1世纪头 2 0年我国现代化建设的宏伟蓝图。江泽民总书记关于全面建设小康社会的理论 ,不仅是对建设中国特色社会主义理论和实践的丰富和发展 ,也是对邓小平小康思想的继承和发展 ,同时为全党和全国人民指明了在新世纪新的发展阶段继续前进的方向     

二维Frenkel激子有效质量与温度的关系

本文计及晶格的原子结构讨论了二维Frenkel激子的性质。用二次量子化方法处理晶格振动及其与激子的相互作用,导出了二维Frenkel激子的自陷能以及它的有效质量与温度的关系。     

Does Education Affect Happiness? Evidence for Spain

In this paper we study the impact of education on happiness in Spain using individual-level data from the European Social Survey, by means of estimating Ordinal Logit Models. We find both direct and indirect effects of education on happiness. First, we find an indirect effect of education on happiness through income and labour status. That is, we find that people with a higher education level have higher income levels and a higher probability of being employed, and thus, report higher levels of happiness. Second, and after controlling by income, labour status and other socio-economic variables, we find that education has a positive (and direct) impact on happiness. We interpret this result as evidence of a ??self-confidence?? or ??self-estimation?? effect from acquiring knowledge. Finally, we find that the direct impact of education on happiness does not depend of the level of education (primary, secondary or tertiary).     

Environment and Happiness: New Evidence for Spain

This paper explores the relationship between air pollution, climate and reported subjective well-being (or happiness) in Spanish regions. The results show that, after controlling for most of the socio-economic variables affecting happiness, there are still significant regional differences in subjective well-being. Evidence also suggests that climate and air pollution variables play a significant role in explaining these regional differences in happiness. The analysis also allows us to calculate the monetary value of air quality and climate, deriving the average marginal rate of substitution between income and air quality and climate for the Spanish regions.