Ruin Probabilities of a Dual Markov-Modulated Risk Model

This article is devoted to studying a dual Markov-modulated risk model, which can properly represent, to some extent, surplus processes of companies that pay costs continuously and have occasional gains. We consider both the finite and infnite horizon ruin probabilities under this dual model. Upper and lower bounds of Lundberg type are derived for these ruin probabilities. We also obtain a time-dependent version of Lundberg type inequalities.     

A PTAS for the minimum weighted dominating set problem with smooth weights on unit disk graphs

In the minimum weighted dominating set problem (MWDS), we are given a unit disk graph with non-negative weight on each vertex. The MWDS seeks a subset of the vertices of the graph with minimum total weight such that each vertex of the graph is either in the subset or adjacent to some nodes in the subset. A?weight function is called smooth, if the ratio of the weights of any two adjacent nodes is upper bounded by a constant. MWDS is known to be NP-hard. In this paper, we give the first polynomial time approximation scheme (PTAS) for MWDS with smooth weights on unit disk graphs, which achieves a (1+ε)-approximation for MWDS, for any ε>0.     

善言感伤——浅谈《淮海词》赢得盛誉的重要原因

秦观词赢得历代词评家们的盛誉，其中一个很重要的原因，就在于他的善于塑造和表现凄怨、感伤之美的特色。这种特色使秦词更吻合于词体独具的善言凄怨、感伤的美学特征，亦使秦词在总体风貌上，比其他词家显得更加“本色”和“当行”。秦词在注重词体自身独特个性的前提下，对词境作了进一步的深化，使之更加意味深长和含蓄隽永，其成功是不应该被轻视的     

关于同调代数的几点注记

将蛇引理推广到双蛇引理，将3×3引理推广到3×n引理、3×3×3引理，并研究了与正合平面、正合立体有关的几个问题及立体交换图问题．     

《文心雕龙》的意象创构论

刘勰在《文心雕龙》中把意象创构看成创作和审美活动的关键,论述了艺术语言与意象传达之间的辩证关系,强调意象创构过程中主客体之间和谐一致的互动关系,并在此基础上讨论了言、象、意三者之间的辩证关系,充分肯定了道在意象创构过程中的本体意义。同时,刘勰还从想象和比兴的角度论述了意象创构过程中的主客观因素,尤其突出了主体情感在意象创构过程中的能动性、创造性以及主导作用,解决了意象创构过程中主客观辩证统一的问题。这是中国文论史上第一个系统的审美意象观,由此形成了中国文艺美学思想中重视意象的传统。     

形势政策教育与视野拓展

宏观视野是大学生在全球化和中国崛起的双重背景下所应具有的思维、能力、素质的综合体现。通过加强完善思想政治教育体系,改革现有大学教育模式,充分利用形势与政策教育平台,加强大学生思维向度的国际视野教育、责任意识的社会视野教育和知识能力的学科视野教育,具有十分重要的意义。     

Nonparametric Covariate-Adjusted Association Tests Based on the Generalized Kendall's Tau()

Identifying the risk factors for comorbidity is important in psychiatric research. Empirically, studies have shown that testing multiple, correlated traits simultaneously is more powerful than testing a single trait at a time in association analysis. Furthermore, for complex diseases, especially mental illnesses and behavioral disorders, the traits are often recorded in different scales such as dichotomous, ordinal and quantitative. In the absence of covariates, nonparametric association tests have been developed for multiple complex traits to study comorbidity. However, genetic studies generally contain measurements of some covariates that may affect the relationship between the risk factors of major interest (such as genes) and the outcomes. While it is relatively easy to adjust these covariates in a parametric model for quantitative traits, it is challenging for multiple complex traits with possibly different scales. In this article, we propose a nonparametric test for multiple complex traits that can adjust for covariate effects. The test aims to achieve an optimal scheme of adjustment by using a maximum statistic calculated from multiple adjusted test statistics. We derive the asymptotic null distribution of the maximum test statistic, and also propose a resampling approach, both of which can be used to assess the significance of our test. Simulations are conducted to compare the type I error and power of the nonparametric adjusted test to the unadjusted test and other existing adjusted tests. The empirical results suggest that our proposed test increases the power through adjustment for covariates when there exist environmental effects, and is more robust to model misspecifications than some existing parametric adjusted tests. We further demonstrate the advantage of our test by analyzing a data set on genetics of alcoholism.     

Identification of quantitative trait loci for canine hip dysplasia by two sequential multipoint linkage analyses

Canine hip dysplasia (CHD) is characterized by hip laxity and subluxation that can lead to hip osteoarthritis. Studies have shown the involvement of multiple genetic regions in the expression of CHD. Although we have associated some variants in the region of fibrillin 2 with CHD in a subset of dogs, no major disease-associated gene has been identified. The focus of this study is to identify quantitative trait loci (QTL) associated with CHD. Two sequential multipoint linkage analyses based on a reversible jump Markov chain Monte Carlo approach were applied on a cross-breed pedigree of 366 dogs. Hip radiographic trait (Norberg Angle, NA) on both hips of each dog was tested for linkage to 21,455 single nucleotide polymorphisms across 39 chromosomes. Putative QTL for the NA was found on 11 chromosomes (1, 2, 3, 4, 7, 14, 19, 21, 32, 36, and 39). Identification of genes in the QTL region(s) can assist in identification of the aberrant genes and biochemical pathways involving hip dysplasia in both dogs and humans.     

新形势下培育和弘扬社会主义核心价值观的意义及路径

有了核心价值观,人们就有了主心骨,就能够更有效地凝聚人心,引领社会前进的方向。积极培育和弘扬社会主义核心价值观,才能使我们的国家、民族、人民在思想和精神上更加强大！在新形势下,社会舆论,特别是网络舆论不断发威。把网络作为培育和弘扬社会主义核心价值观的有力抓手,把握好网上“网下”舆论引导的时、度、效,同时注重内化社会主义核心价值观达到“知行”合一,是培育和弘扬社会主义核心价值观的重要路径。     

21世纪海上丝绸之路建设:广州的战略选择与关键问题

建设21世纪海上丝绸之路,是党中央和国务院在新的历史时期根据内外环境变化做出的重大战略决策部署,对广州加快转型升级、拓展经济发展空间具有极其重要的意义.广州具有参与建设21世纪海上丝绸之路的独特优势和良好条件,必须抓住用好这一重要战略机遇,明确战略定位,加快布局推进,率先在21世纪海上丝绸之路建设中取得突破.