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.     

晚清留日回族学生与辛亥革命——基于“留东清真教育会”会员史迹的考察

在中国伊斯兰教和回族历史中,留东清真教育会的组建及其刊物《醒回篇》的发行,以及其爱国爱教的思想颇受后世关注,但其成员与辛亥革命的关系一直没有得到深入的研究和讨论。本文考订留东清真教育会主要成员事迹,探析其与同盟会的关系,发掘其成员归国后在各省光复运动中的表现,揭示晚清回族留日学生与辛亥革命的关联,认为该会是受孙中山民主革命思想的影响创立的一个革命团体。留东清真教育会成员的行动,体现了近代回族的文化自觉和国家认同,从一个侧面反映出民主共和观念对多民族国家少数民族发展的影响。     

Co-Occurring Psychosocial Problems and Multiple Sexual Partners among Men Who Have Sex with Men in Shanghai,China: A Syndemic Approach

We aimed to apply syndemic theory to verify the association and reinforcing effects between psychosocial problems and multiple sexual partners (MSP) of men who have sex with men (MSM) in Shanghai, China. A cross-sectional study was conducted among 547 MSM in Shanghai, China using a face-to-face survey. Sociodemographic and psychosocial data were collected, as well as information on MSP and condomless anal sex. In the 6 months prior to the survey, 54.3% of the MSM sample had had MSP. Univariate analysis showed that self-esteem, depression, loneliness, sexual compulsivity, and involuntary subordination (IS) were associated with MSP. Sexual compulsivity (multivariate odds ratio [ORm] = 2.94, 95% CI = 1.76–4.91) and IS (ORm = 1.79, 95% CI = 1.14–2.81) remained significant in multivariate analysis. MSM with five or more psychosocial problems had greater odds of (adjusted odds ratios = 3.06, 95% CI = 1.49–6.25) having MSP in the previous 6 months than the non-syndemic group. Our findings provide preliminary confirmation of the additive relationship of syndemic psychosocial health conditions and MSP among MSM in Shanghai, China. An integrated intervention with special focus on sexual compulsivity and IS is needed.     

Tweeting about emergency: A semantic network analysis of government organizations’ social media messaging during Hurricane Harvey

While social media like Twitter have been increasingly adopted by public-sector organizations, it remains less explored as to how government and emergency management (EM) organizations use these platforms to communicate with the public in response to emerging natural disasters. Extending the Situational Crisis Communication Theory (SCCT) to the realm of social media, this study examines the emerging semantic networks from 67 government and EM organizations’ official tweets during Hurricane Harvey over a three-week period. It identifies how multiple crisis response strategies—including instructing information, adjusting information, and bolstering—are constituted of different issues, actions, and organizational actors before, during, and immediately after the disaster event. Results suggest that government agencies use the strategy of instructing information predominantly before and during the disaster, whereas adjusting information and bolstering strategies are utilized more during post-disaster recovery. The study offers theoretical and practical implications of using a semantic network approach to studying organizational crisis responses.     

Neighbor sum distinguishing list total coloring of subcubic graphs

Let \(G=(V, E)\) be a simple graph and denote the set of edges incident to a vertex v by E(v). The neighbor sum distinguishing (NSD) total choice number of G, denoted by \(\mathrm{ch}_{\Sigma }^{t}(G)\), is the smallest integer k such that, after assigning each \(z\in V\cup E\) a set L(z) of k real numbers, G has a total coloring \(\phi \) satisfying \(\phi (z)\in L(z)\) for each \(z\in V\cup E\) and \(\sum _{z\in E(u)\cup \{u\}}\phi (z)\ne \sum _{z\in E(v)\cup \{v\}}\phi (z)\) for each \(uv\in E\). In this paper, we propose some reducible configurations of NSD list total coloring for general graphs by applying the Combinatorial Nullstellensatz. As an application, we present that \(\mathrm{ch}^{t}_{\Sigma }(G)\le \Delta (G)+3\) for every subcubic graph G.     

社会转型期助人被讹现象的人类学分析

历史经验表明,现代化过程往往会导致传统与现代在价值观、道德判断和行为规范方面的冲突;当代中国也不可避免要经历这些变化。通过分析助人被讹现象的特点、社会原因和道德后果,试图揭示社会转型期间两种伦理体系的冲突及其对个体行动者的影响。文章将首先考察"做好事被讹"现象的主要特征。大多数讹人者都是那些本该获得同情和帮助的年长者。再将探讨"做好事被讹"现象对社会的多方面影响,认为"做好事被讹"事件尽管少有发生,但它对社会信任、同情和道德互惠原则造成了重创。最后探究导致这种令人恼火的行为产生的多种社会原因,也广泛讨论了当代中国社会的道德风貌。     

地震致残者生存状态与需求分析——来自四川省汶川地震灾区的调查

文章通过对汶川地震灾区调查所获数据,介绍震区致残者的基本情况,对其生存状态和需求进行分析。调查显示,地震致残者的生存状态不容乐观,其住房状况较差,婚姻问题多样,就业率和就业层次较低,社会保障力度相对薄弱,其中农村地震致残者的问题尤为突出。整体而言,由于特惠政策不到位等原因导致其核心需求满足低,长远需求与供给存在一定程度错位。另外,心理康复工作不完善使其全面康复得不到保障。针对地震致残者面临的现实问题,作者提出了一些相应的对策建议。     

Government Capital,Intimate and Community Social Capital,and Food Security Status in Older Adults with Different Income Levels

Whether government‐based forms of food assistance such as the Supplemental Nutrition Assistance Program (SNAP), communal efforts including food pantries, aid from friends and family, or alternative means such as gardening are the appropriate means to reduce the prevalence of household food insecurity is a continuous source of policy contention. To inform this debate, we examine the relative importance of these forms of food assistance and acquisition to a sample of U.S. older adults from the 2010 Brazos Valley Health Assessment of central Texas households that have been stratified by income eligibility for SNAP, low‐income SNAP ineligibility, and above low income status. To identify how membership in these socioeconomic groups constrains household capacity to acquire sufficient food to maintain an adequate and healthy diet, we explore the varied associations of assets received from government; communal and intimate social networks; and alternative food sources such as gardening, hunting, and fishing with household food security across socioeconomic status, while examining the importance of place of residence on the use of capital assets. SNAP participation was the only specific capital asset associated with all levels of food insecurity for both SNAP‐eligible and ineligible low‐income groups, thus emphasizing the continued importance of food assistance among poverty‐level older adults.     

浙江非公企业劳资矛盾与工会调节作用研究——基于农民工租住地工会的实证研究

随着社会经济的发展,非公有制经济对我国经济的贡献越来越大,非公有制企业的劳资关系问题也日益突出.今天的中国,尽管工会面临着种种困境,但工会的作用仍然很重要.当前迫切需要解决的是工会代表工人利益的有效性问题.农民工租住地工会通过组建工会的方式吸纳农民工精英进入工会管理层,并动员农民工参与社区的公共生活,逐渐使他们产生了“社区认同”,农民工管理发生了由社会被动防控与管理型向主动引导、服务、建设型的转变,由分割向融合的转变,破解工会在农民工集聚的地方如何组织管理与协调劳资矛盾,促成了社区的和谐与稳定.探讨市场经济条件下企业外工会力量的成长或许能为中国工会转型提供一些借鉴和帮助,为转型期创新社会管理提供有益探索.     

中国农产品价格波动的非线性瞬间机制转换研究

农产品价格持续上涨中的波动问题受农产品价格波动自身惯性和不确定性影响较大,直接制约着中国经济的稳定增长,研究其转换机制和状态空间有重要意义。在条件异方差的非线性机制转换模型的基础上,选用1998年1月11日到2011年10月30日中国粮油批发价格周收益率为农产品价格波动和通胀率的研究对象,实证研究结果显示同L-STAR和E-STAR模型相比,C-STAR-GARCH模型有更好的估计结果和预测效果,并且能更好地刻画转换区制,在此基础上继续探究了多机制的C-STAR模型的估计能力。研究方法为进一步研究农产品价格市场提供了范式,研究结论有现实意义。