均值方差偏好和下方风险控制下的动态投资组合决策模型

本文在均值方差框架下，研究了下方风险控制下的动态投资组合问题。在目标函数中考虑了投资组合的最坏结果，利用标准的期权定价理论，给出了最优投资策略的解析式。该投资策略等价于一个关于“资产”最小二阶矩组合的欧式看跌期权和无风险资产的组合，而且两基金分离定理仍然成立。     

β值证券组合投资决策模型研究

本文利用证券收益的市场模型和资本资产定价模型(CAPM)对均值—方差模型进行简化,导出了β值证券组合投资决策模型,并研究该模型的解及其性质。 一、β值和市场模型 证券收益可以分为两个部分之和:一部分为与市场收益相关的系统性收益,另一部分为与市场无关的非系统性收益。用公式表达为:     

20世纪金融数学的若干进展及前瞻

本文仅对20世纪金融数学的历史作一探讨,对金融数学的发展趋势作一瞻望。 一、金融数学的定义 金融数学作为学科名词出现在20世纪80年代末。金融数学这一学科名称的出现,是Markowitz的证券组合选择理论和Black-Scholes期权定价理论这两次“华尔街革命”的直接产物。无论是Markowitz的均值-方差理论,还是Black-Scholes的随机微分方程,都是用     

两种证券投资组合权数的优化选择

本文以最值、均值和方差作为工具,建立了两种证券投资组合收益与方差的模型,比较严谨地论证了随着相关系数的变化,两种证券投资组合权数的优化选择方法。     

基于心理会计的投资选择

本文讨论了现实投资活动中存在的与传统均值—方差理论相悖的现象，通过引入心理会计的因素，讨论了基于心理会计下的有效投资组合的一些特征，并对传统的均值--方差理论进行了修正。     

均值—方差模型在个人理财中的应用及优化

本文简要论述了均值—方差模型及最优投资组合,并在此基础上引入交易成本及无风险资产因素对Markowitz均值—方差模型进行优化,使得经典的均值—方差模型更具适用性。     

不可卖空条件下证券组合的逐次优化法

1 引言 马克维资(Markowite)的均值--方差模型是现代证券组合理论的基础.应用这个模型可以准确地确定n个证券组合的有效前缘.但是应用这个模型,需要估计的参数多,计算量大,这就大大地限制了它的应用范围(参考文献Ⅰ).     

原始及加入人民币的特别提款权作为外汇储备资产的特性分析

本文使用均值-半方差的方法,在不同条件下构建了中国、日本、英国及欧盟的外汇储备资产的有效性边界。研究表明:将特别提款权(SDR)作为外汇储备资产可以提高资产组合的表现;人民币成为特别提款权组成货币可以增强特别提款权作为外汇储备资产的功能。     

期货套期保值决策模型研究

期货套期保值模型的研究经历了传统全额套保、线性回归、线性均值一方差三个阶段，目前正在动态和非线性等方向上进行探索。为了解决以往模型无法描述套期保值者效用的非线性特征、无法利用套期保值者的现货价格知识以及不能更充分地给出套期保值决策分散性来源等缺陷，本文发展了套期保值决策的非线性均值一方差模型，将线性模型的结果作为特例并推广了线性模型，不仅对套期保值者的效用描述得更为真实合理，而且使套期保值者利用现货价格知识改善套期保值操作成为可能，拓展了套期保值模型在期货定价理论和企业套期保值实践中的应用空间。     

EaR风险度量与动态投资决策

本文引入在险收益（Earnings-at-Risk,EaR)的风险概念，并考虑连续时间Markowitz均值－方差型证券投资组合选择问题，其中度量风险的方差被替代为终端财富的在险收益。在Black-Scholes设置下，我们给出了均值－在险收益意义下的最优常数再调整（Best constant-rebalanced)证券组合投资策略以及有效边界的显式表达式。这一结果可方便地应用于动态投资决策与管理的实践中。我们还给出概念与结论的一些经济学解释。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.