中国流通A股市场投资者实现回报率研究

现实中的股票市场不可能完全符合资本市场有效性假设,因而把股票成交价格看作是股票的市场价值,并据此计算股票投资回报率的传统做法存在着明显的弊端。投资者实际实现的回报率对现实股票市场,特别是规范程度很低的我国股票市场的研究具有重要意义。本文提出了无需完全有效市场假设的现金概念及以此为基础的投资者实现回报率概念,并给出了现有条件下的投资者回报率计算公式和沪深两市的计算结果。     

Private Action for Public Good?: The Public Role of Voluntary Sector Organizations

Voluntary sector organizations claim to be private institutions acting for the public good. However, if the concept of public is disengaged from the state and connected instead to citizenship, VSOs can be shown to have both private and public origins, as well as private and public impacts. As citizens, VSOs are public organizations serving the public good through their purported representation of the people and civic leadership. The legitimacy of their assumption of these public roles remains a continuing challenge.     

信任与激励:价值链成本治理机制的实验研究

本文采用试验研究方法,模拟价值链节点企业交易过程,研究了信任与激励两种价值链成本治理机制的治理效果以及它们之间的作用关系。试验结果显示,高度信任与基于价值链利益的激励机制均可以有效缓解或防范合作问题、协调问题和侵占问题,对价值链成本治理具有明显的治理效果。当价值链节点企业之间缺乏信任的时候,激励机制会失去效用;信任机制与激励机制之间具有显著的互补关系。     

A comparison of classification models to identify the Fragile X Syndrome

The main models of machine learning are briefly reviewed and considered for building a classifier to identify the Fragile X Syndrome (FXS). We have analyzed 172 patients potentially affected by FXS in Andalusia (Spain) and, by means of a DNA test, each member of the data set is known to belong to one of two classes: affected, not affected. The whole predictor set, formed by 40 variables, and a reduced set with only nine predictors significantly associated with the response are considered. Four alternative base classification models have been investigated: logistic regression, classification trees, multilayer perceptron and support vector machines. For both predictor sets, the best accuracy, considering both the mean and the standard deviation of the test error rate, is achieved by the support vector machines, confirming the increasing importance of this learning algorithm. Three ensemble methods - bagging, random forests and boosting - were also considered, amongst which the bagged versions of support vector machines stand out, especially when they are constructed with the reduced set of predictor variables. The analysis of the sensitivity, the specificity and the area under the ROC curve agrees with the main conclusions extracted from the accuracy results. All of these models can be fitted by free R programs.     

一种简单的过流过压保护电路

详细介绍了一种实用的过流过压保护电路及工作原理 ,该电路具有可靠性高、反应快等特点     

东海何处吊苍水─—张煌言在舟山遗迹考

本文以张煌言年谱与文集为主轴，结合实地考察，勾画出张煌言（苍水）在舟山遗迹的大概轮廓；从横向与纵向两个层面对张煌言的思想、实践和个人品质进行评价，揭示传统文化的久远影响及其意义。文章还就张煌言与郑成功以及文天祥的对比，对历史“公正”与“不公正”作了深层次的哲学思考。     

苏州地铁某车站深基坑围护结构监测分析

对苏州地铁某车站明挖基坑施工进行跟踪监测，及时掌握围护结构变形、支撑内力的变化动态，以指导施工确保基坑稳定。经过对比分析基坑有、无加固措施的变形和支撑内力的变化特征表明：基坑外水泥土搅拌桩加固措施的设置，可以有效地减小围护结构的水平变形，并且能够阻碍边坡滑移破坏面的发展，减小作用于地下连续墙上面的土压力，使得内支撑上的最大轴力减小。     

REGULATION AND CONTROL OF SUBJECTIVITY AND PRIVATE LIFE IN THE CONTEXT OF ARMED CONFLICT IN COLOMBIA1

A qualitative study was carried out in four municipalities in four different conflict zones in Colombia. Intrafamilial violence and gender violence are studied through the testimonies of the people interviewed. The impact was analysed in terms of the exercise of control over the civilian population by paramilitaries in relation to subjectivity, the family, social networks and the prevailing moral order. In effect, the strengthening of barriers between traditional gender identities has enabled a de-structuring of traditional masculinity through moral co-optation, the reinforcement of traditional feminine identity and the objectification of the sexuality of young women, at the same time as they are manipulated sexually and emotionally. In general, strong legitimation of the model of the armed fighter as a paradigm of masculinity is found in children. In addition, the de-structuring of the family and its manipulation as a means of influence over civil society is one of the strategies employed for the installation of a regime of terror that fractures social networks. It does this through the erosion of confidence and the legitimation and mystification of the power of an actor whose mediation in inter-family and micro-social conflicts has been legitimated, instrumentalizing and scaling up traditional violence, taking advantage of the power vacuum and moral weaknesses in local culture.