浅谈我国古代文艺作品中的影射技法

影射 ,作为一种文学技巧 ,最先出现在《诗经》 ,日后由于意识形态变化的原因 ,并在儒家文学观的指引下 ,逐渐推广到辞赋、散文、小说、词曲和戏剧所有文学领域 ,表现形式也由单一的比喻象征发展到多种类型 ,形成姿态横生、形式大备、羽翼丰满的艺术手段     

Assessing goodness-of-fit of categorical regression models based on case-control data

Demonstrated equivalence between a categorical regression model based on case‐control data and an I‐sample semiparametric selection bias model leads to a new goodness‐of‐fit test. The proposed test statistic is an extension of an existing Kolmogorov–Smirnov‐type statistic and is the weighted average of the absolute differences between two estimated distribution functions in each response category. The paper establishes an optimal property for the maximum semiparametric likelihood estimator of the parameters in the I‐sample semiparametric selection bias model. It also presents a bootstrap procedure, some simulation results and an analysis of two real datasets.     

Weakly implementable social choice rules

Previous investigations have shown that a social choice function which is partially implementable must be characterized by pervasive veto power. This paper investigates how much additional latitude in the design of social choice functions, and how much relief from this vetoers result, can be achieved by examining multi-valued social choice rules and relaxing the requirement of partial implementability to a requirement that we call weak partial implementability. We find that the power structures which characterize partially implementable social choice functions, including the veto properties, also characterize weakly partially implementable social choice rules. The conclusion is that invoking multi-valuedness and implementation of appealing social choice rules in strong Nash equilibria. Our results apparently exhaust the possibilities for implementation in strong Nash equilibrium. If any implementation possibility results are to be achieved, they can apparently come only by weakening the equilibrium requirement.     

衔接 连贯与阅读理解

衔接是语篇特征的重要内容.尽管语义上连贯的语篇可以没有形式上的衔接纽带,但在大多数自然出现的语篇中是存在衔接纽带的,这些纽带不仅会增强语篇的连贯性,而且对阅读理解有着很大的帮助作用.分析衔接与阅读的关系以及如何应用照应、替代、省略、连接和词汇衔接纽带促进并加深对语篇的理解.     

基于利润的股票定价模型研究

股息现值模型 (Gordon model)、税后利润再投资有限增长模型 (Gordon and Gordon m odel)以及简化后的税后利润再投资有限增长模型 (Morris m odel)都无法为亏损公司的股票定价。根据弱有效市场假设 ,提出基于净利润的股票定价模型。该模型允许公司未来几年把全部或部分利润投资于盈利项目。利用该模型投资者可以计算不同类型上市公司股票的投资价值     

大学生课外科技活动的实践探索

大学生课外科技活动是科技素质教育的重要环节。其重要性和现实针对性在于,科技知识不等于科学素质,知识与创新能力是不同概念,科学素质(思维、方法、精神、创新能力)均靠后天养成,而第二课堂是重要形式和途径。活动主要内容包括科技报告、科技阅读和科技实践。应成立领导小组或指导中心,学分制管理规定增加“科技活动”项目,建立激励机制并保证运作经费,以建章立制;并努力形成团组织牵头,院(系)据专业特点独立运作,大学生科协自发组织的工作格局;推进大学生课外科技活动的制度化与实践的丰富多样性。     

Optimal scaling of Metropolis algorithms: Heading toward general target distributions

The authors provide an overview of optimal scaling results for the Metropolis algorithm with Gaussian proposal distribution. They address in more depth the case of high‐dimensional target distributions formed of independent, but not identically distributed components. They attempt to give an intuitive explanation as to why the well‐known optimal acceptance rate of 0.234 is not always suitable. They show how to find the asymptotically optimal acceptance rate when needed, and they explain why it is sometimes necessary to turn to inhomogeneous proposal distributions. Their results are illustrated with a simple example.     

江泽民同志关于“文化纽带”的重要论述

江泽民同志对文化纽带的两次深刻论述 ,主要是针对祖国统一和维护世界和平、促进共同发展的历史任务 ,强调了中华文化团结人民、凝聚人心的巨大作用。因此 ,文化纽带的内涵 ,实质就是中华文化的凝聚力问题。这是我们必须继承的宝贵精神财富 ,也是推进民族复兴大业的极为重要的力量     

Robust block bootstrap panel predictability tests*

This article develops two block bootstrap-based panel predictability test procedures that are valid under very general conditions. Some of the allowable features include cross-sectional dependence, heterogeneous predictive slopes, persistent predictors, and complex error dynamics, including cross-unit endogeneity. While the first test procedure tests if there is any predictability at all, the second procedure determines the units for which predictability holds in case of a rejection by the first. A weak unit root framework is adopted to allow persistent predictors, and a novel theory is developed to establish asymptotic validity of the proposed bootstrap. Simulations are used to evaluate the performance of our tests in small samples, and their implementation is illustrated through an empirical application to stock returns.     

高铁网络下的中国十大城市群旅游交通格局及其经济联系的比较研究

旅游交通是旅游经济发展中重要的内容之一,通过对中国十大城市群城市旅游交通可达性、铁路交通流分布情况与旅游经济联系、总量和隶属度进行计算,借助Arcgis10.2对中国十大城市群交通空间流分布情况和旅游经济联系进行空间可视化处理,并对计算结果进行综合比较分析。研究发现:高铁使得中国十大城市群城市旅游交通可达性水平得到大幅提升,且交通流分布均衡。中国十大城市群城市可达性的提升给城市旅游经济带来了一定的积极影响。高铁网络下中国十大城市群旅游经济联系分布不均衡。