Dynamic optimal capital growth of diversified investment

We investigate the problem of dynamic optimal capital growth of diversified investment. A general framework that the trader maximize the expected log utility of long-term growth rate of initial wealth was developed. We show that the trader's fortune will exceed any fixed bound when the fraction is chosen less than critical value. But, if the fraction is larger than that value, ruin is almost sure. In order to maximize wealth, we should choose the optimal fraction at each trade. Empirical results with real financial data show the feasible allocation. The larger the fraction and hence the larger the chance of falling below the desired wealth growth path.     

论“立言”

两千多年前的春秋时代,中国知识分子就非常重视"立言",把它视作传名、追求不朽甚至永恒的重要手段。在建设文化强国的今天,继承"立言"的传统,把有价值的见解或史料、经验、发现等通过著书立说的方式贡献出来,是很有必要的。如何"立言",如何使自己所立之言得到社会的认可,并有较长的生命力,是目前知识界面临的难题。"立言"之人要有追求真理的精神、实事求是的态度;"立言"者须有创新意识,努力使自己的著作具有独创性;"立言"者还必须有精品意识,对自己的著作不断修改、加工,使之趋于完美;"立言"者须先修身,提高自身精神境界,更好地了解社会的需要和自己的责任。如此,方能"立言"成功。     

身份、 知识与文学创作——基于汉代文学主体的思考

汉代作家是具有不同社会身份、 知识结构及审美取向的个体, 身份、 知识背景对作家创作有直接的影响和规约. 不同阶层、 不同社会身份的文学主体, 日常所关注的事务不同, 所思所想有异, 因此, 诉诸文学创作即形成了言说内容及主题话语的明显差异. 与身份相应, 不同的学术背景及知识结构,也会直接带来文学主体审美取向及话语方式的差别. 身份、 知识结构、 审美取向之异是汉代文学生成及发展的重要内驱力.     

《孙子兵法》中的理想主义成分及其对中国梦的启示

《孙子兵法》是杰出的现实主义军事著作，其中也饱含着诸多理想主义的成分。其具体内容包括：“保国安民”的远大政治理想、“全胜易胜”的战略理想境界、“上下同欲”的理想治军模式、“五德兼备”的完美将帅素养等。同时，孙子将他的理想主义建立在客观现实的基础之上，强调“仁义与诡诈的结合”“全胜与破胜的结合”“教化与法制的结合”“完美与理性的结合”等。此种理想与现实有机结合的思维方法和思想方法，不仅在中国历史上产生了深远的影响，而且对当今“中国梦”的实现也有着深刻的借鉴价值。     

小说学与“长时段”:论胡怀琛的中国小说史学

民国学者胡怀琛著有《中国小说研究》、《中国小说概论》、《中国小说的起源与演变》等普及型文学史著作,其研究理念与著述体例有别于鲁迅的《中国小说史略》。胡怀琛的中国小说史学以小说类型为经,以时代为纬,讲求小说学与小说史学的融合互渗,注重把握小说文体演变的内在逻辑与宏大结构。胡怀琛以现代意义的小说观为参照,重新整合经史子集中具有"小说"意味的文本,藉此重新发现中国的"小说",并重建各种历史文本与文类的关联性和有序性。胡怀琛将"长时段"的历史思维与解释方法运用于中国小说史研究,从"形"与"质"两方面勾勒出中国小说历史演化的基本轮廓。     

从“以人为本”到政府“公信”--新世纪初政府公信力构建的进路评析

政府公信力是政府凭籍自身信用赢得公众信任的能力，十六大以来，党在施政理念上强调"以人为本"，在执政行为上关注"民生"；在绩效上彰显公平正义，施政方略渗透着人文关怀因素，政府公信力得到了有效提升。但由于腐败现象没有得到有效控制，党风廉政与制度化建设相对滞后，政府公信力也受到了冲击。在新一代领导集体治国理政中，"改革"成为新的常态，防腐败斗争与党风廉政建设取得了伟大成就，政府公信力的重振业已开启。     

The ‘right time’ – negotiating the timing of interviews with vulnerable young people

Participant retention is a key factor in determining the success of longitudinal research. Challenges in re-locating and retaining participants over the long term are major issues for researchers working with young people who face adversity and experience frequent changes in circumstances. This article reports on a study of vulnerable young people and their transition into adulthood. Rather than the more conventional schedule-based approach to locating and re-interviewing young people, a relational process, the ‘right time’ framework, was used to facilitate young people's involvement in the study. Embedded in the ‘right time’ framework is recognition of the diverse and fluctuating circumstances that shape young people's availability for interviews. Several case examples are considered which amplify the way that the ‘right time’ framework allowed the research to navigate around these circumstances. The case examples highlight the value young people attached to being involved in the research, the influence on the ‘right time’ of wider relational tensions for young people and the need to negotiate researcher status as a different sort of adult. The ‘right time’ framework contributed to a high retention rate in the study generating a more representative sample and enhancing the subsequent data analysis by providing valuable insights into the lives of these vulnerable young people.     

Optimization of Cascade‐Resilient Electrical Infrastructures and its Validation by Power Flow Modeling

Large‐scale outages on real‐world critical infrastructures, although infrequent, are increasingly disastrous to our society. In this article, we are primarily concerned with power transmission networks and we consider the problem of allocation of generation to distributors by rewiring links under the objectives of maximizing network resilience to cascading failure and minimizing investment costs. The combinatorial multiobjective optimization is carried out by a nondominated sorting binary differential evolution (NSBDE) algorithm. For each generators–distributors connection pattern considered in the NSBDE search, a computationally cheap, topological model of failure cascading in a complex network (named the Motter‐Lai [ML] model) is used to simulate and quantify network resilience to cascading failures initiated by targeted attacks. The results on the 400 kV French power transmission network case study show that the proposed method allows us to identify optimal patterns of generators–distributors connection that improve cascading resilience at an acceptable cost. To verify the realistic character of the results obtained by the NSBDE with the embedded ML topological model, a more realistic but also more computationally expensive model of cascading failures is adopted, based on optimal power flow (namely, the ORNL‐Pserc‐Alaska) model). The consistent results between the two models provide impetus for the use of topological, complex network theory models for analysis and optimization of large infrastructures against cascading failure with the advantages of simplicity, scalability, and low computational cost.     

Longitudinal Mediators of Relations Between Family Violence and Adolescent Dating Aggression Perpetration

Few longitudinal studies have examined the pathways through which family violence leads to dating aggression. In the current study the authors used 3 waves of data obtained from 8th‐ and 9th‐grade adolescents (N = 1,965) to examine the hypotheses that the prospective relationship between witnessing family violence and directly experiencing violence and physical dating aggression perpetration is mediated by 3 constructs: (a) normative beliefs about dating aggression (norms), (b) anger dysregulation, and (c) depression. Results from cross‐lagged regression models suggest that the relationship between having been hit by an adult and dating aggression is mediated by changes in norms and anger dysregulation, but not depression. No evidence of indirect effects from witnessing family violence to dating aggression was found through any of the proposed mediators. Taken together, the findings suggest that anger dysregulation and normative beliefs are potential targets for dating abuse prevention efforts aimed at youth who have directly experienced violence.     

关于光复会创建的几个问题--兼与项义华先生商榷

东京的“励志会”“亡国纪念会”“青年会”“军国民教育会”，杭州的“兴浙会”“浙会”“浙学会”和上海的“中国教育会”“爱国学社”等进步团体均是光复会的来源。陶成章与龚宝铨受东京浙学会和军国民教育会的派遣，前往上海创建了光复会。光复会初建时，考虑到应由一个德高望重的人出任会长，于是有着清朝翰林头衔又倡导反清革命的蔡元培被推为首任光复会会长。光复会创建伊始，即将反清作为革命目标。