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.     

Entrepreneurial Motivations and Capabilities of Migrant Entrepreneurs in Australia

This article presents findings on immigrant entrepreneurship in Australia. The relationship between the entrepreneurial start‐up motivation, co‐ethnic preferences and entrepreneurial capabilities of established immigrant businesses are explored. We analyse data collected with a self‐administered survey questionnaire from 157 immigrant entrepreneurs in Melbourne's suburbs. Our findings show that immigrant entrepreneurs who report a high level of individual achievement as their start‐up motivation also report high levels of entrepreneurial capabilities in terms of opportunity recognition, managerial innovativeness and proactiveness. Immigrant entrepreneurs who are highly influenced by co‐ethnic preferences on staff employment and customer targeting report higher opportunity recognition than those who have a co‐ethnic preference on suppliers. We provide important insights and explanations for these findings and their implications for Australian immigrant entrepreneurs and policymakers.     

A quadratic time exact algorithm for continuous connected 2-facility location problem in trees

This paper studies the continuous connected 2-facility location problem (CC2FLP) in trees. Let \(T = (V, E, c, d, \ell , \mu )\) be an undirected rooted tree, where each node \(v \in V\) has a weight \(d(v) \ge 0\) denoting the demand amount of v as well as a weight \(\ell (v) \ge 0\) denoting the cost of opening a facility at v, and each edge \(e \in E\) has a weight \(c(e) \ge 0\) denoting the cost on e and is associated with a function \(\mu (e,t) \ge 0\) denoting the cost of opening a facility at a point x(e, t) on e where t is a continuous variable on e. Given a subset \(\mathcal {D} \subseteq V\) of clients, and a subset \(\mathcal {F} \subseteq \mathcal {P}(T)\) of continuum points admitting facilities where \(\mathcal {P}(T)\) is the set of all the points on edges of T, when two facilities are installed at a pair of continuum points \(x_1\) and \(x_2\) in \(\mathcal {F}\), the total cost involved in CC2FLP includes three parts: the cost of opening two facilities at \(x_1\) and \(x_2\), K times the cost of connecting \(x_1\) and \(x_2\), and the cost of all the clients in \(\mathcal {D}\) connecting to some facility. The objective is to open two facilities at a pair of continuum points in \(\mathcal {F}\) to minimize the total cost, for a given input parameter \(K \ge 1\). This paper focuses on the case of \(\mathcal {D} = V\) and \(\mathcal {F} = \mathcal {P}(T)\). We first study the discrete version of CC2FLP, named the discrete connected 2-facility location problem (DC2FLP), where two facilities are restricted to the nodes of T, and devise a quadratic time edge-splitting algorithm for DC2FLP. Furthermore, we prove that CC2FLP is almost equivalent to DC2FLP in trees, and develop a quadratic time exact algorithm based on the edge-splitting algorithm. Finally, we adapt our algorithms to the general case of \(\mathcal {D} \subseteq V\) and \(\mathcal {F} \subseteq \mathcal {P}(T)\).     

女娲"人首蛇身"形象的结构分析

本文通过古籍中对女娲记载的分析,确定大约汉代时人们对女娲人首蛇身的形象已经形成相对一致的认识;并从野性的思维角度重新审视半人半兽形象的由来,认为人首蛇身是思维对自然—文化秩序进行调和的产物,并具体结合女娲神话分析了人首蛇身的来源和内涵,以及蛇身在大母神形象中的意义、蛇多样的象征意义对女娲神格的影响。     

守望者的牧歌及其变奏——玛尔罕诗歌简论

间两侧的颂辞>是撒玛尔罕(韩文德)个人出版的第三部诗集,也是撒拉族诗人出版的第七部诗集.撒拉族作家为数实在太少,而在有限的撒拉族作家群中,诗人却占有着多数比例.撒拉族文化人容易形成特殊的诗性心理气质,与其活过两次的民族命运和充满悲壮传奇色彩的民族历史不无关系.因为,"置身于这样一种特殊历史大背景中的民族文化人,他们对自己民族历史和家园的追念情感,一开始便具有着天然的诗歌特质,也使他们拥有了接近诗歌本质的先天性."(燎原语)     

论和谐政治生态系统与政治宽容调节机制的构建

和谐政治生态突破了传统社会仅从人与人、人与社会的关系角度去理解政治的理论局限,而把政治—社会—自然三者视为三位一体的大系统,把社会更把自然纳入政治视野,运用生态学的多元思维,调整人与人、政治与社会、社会与自然的关系。这是政治价值观的一种转变。理性而客观地分析政治生态系统的本质内蕴和系统结构,并努力寻求积极的、良性运行的和谐政治生态系统和政治宽容调节机制的建构,对和谐社会的践行无疑具有重要的现实意义和理论价值。     

基于Citespace Ⅱ的竞争情报文献的可视化分析

文章以CSSCI数据库有关竞争情报研究的1048条文献和其所包含的参考文献为研究对象,运用CiteSpaceⅡ绘制知识图谱,梳理了竞争情报具有影响力的作者、机构以及竞争情报知识基础、研究前沿和研究热点等问题。     

现代政治文化与民族国家治理

现代政治文化具有世俗性、自主性、开放性与融合性。民族国家治理是国家公共权力控制和引导政治、社会活动的运作行为。政治文化现代化与民族国家治理之间存在互动关系。现代政治文化对民族国家治理提供支撑与协调,民族国家的治理活动推动、引导政治文化现代化的发展。     

Additive mixed effect model for recurrent gap time data

Gap times between recurrent events are often of primary interest in medical and observational studies. The additive hazards model, focusing on risk differences rather than risk ratios, has been widely used in practice. However, the marginal additive hazards model does not take the dependence among gap times into account. In this paper, we propose an additive mixed effect model to analyze gap time data, and the proposed model includes a subject-specific random effect to account for the dependence among the gap times. Estimating equation approaches are developed for parameter estimation, and the asymptotic properties of the resulting estimators are established. In addition, some graphical and numerical procedures are presented for model checking. The finite sample behavior of the proposed methods is evaluated through simulation studies, and an application to a data set from a clinic study on chronic granulomatous disease is provided.     

关于增强社会主义意识形态吸引力和凝聚力的若干思考

改革开放以来,当代中国意识形态领域的发展态势使我国的社会主义意识形态建设面临着严峻的挑战,迫切需要增强社会主义意识形态的吸引力和凝聚力.对此,应把建设社会主义核心价值体系与增强社会主义意识形态的吸引力和凝聚力有机地统一起来,正确认识坚持马克思主义在意识形态领域的指导地位和当今文化发展多样性的关系,大力推进马克思主义意识形态理论创新,不断推动当代中国马克思主义大众化,用社会主义核心价值体系引领社会思潮.