提高证券投资价值的方法探讨

本文应用马克维兹(Markowitz)均值一方差模型.分别从提高组合证券投资的收益率和降低组合证券投资的风险两个方间研究了提高组合证券投资价值的方法.     

风险厌恶型的证券投资数学模型

本文讨论了证券分析的过程和证券投资计划的制定。我们视证券价格的波动为动态的模糊系统，利用模糊数的概念分析了证券价格的变化规律和定义了模糊集理论下的证券价格的期望值、证券投资收益率的期望值、预期风险系数。利用这些结果，我们得到了一个风险厌恶型的证券投资数学模型，为证券投资者的决策问蹄提供了一种新的解决途径。该模型的建立依赖于投资者的知识和经验，它的求解过程简单易行。     

关于DEA有效性理论的一点探索

给出经典的基于输入和输出的DEA模型,把基于DEA模型相结合的相对效率模型引入评价证券相对有效性,以风险作为输入,期望收益率作为输出,便可以用DEA模型评价每只证券相对有效性。     

预期收益率的证券组合投资比例计算

本文针对证券价格总是围绕价值上下波动的特征,以较大概率获取预期收益率为目的,用概率统计方法建立了预期收益率下的证券组合投资模型,由极值原理求出了模型中的证券组合投资比例。     

区间规划在证券投资组合问题中的运用

本文基于区间规划的方法研究了摩擦市场的投资组合选择问题。文中把风险证券的收益率、投资风险及证券的流动性用区间数来描述,并结合绝对偏差风险函数的思想建立了一种关于区间数的证券投资组合选择模型。最后利用区间数的两种序关系将所提出的模糊线性规划问题转化为普通的参数线性规划问题进而求其解。     

证券组合投资中的风险价值VaR概述

VaR作为金融风险测度的主流方法,已在证券投资领域中得到了广泛的应用。本文主要说明VaR的定义、参数和计算方法,并介绍了基于VaR风险测度的组合投资模型“均值-VaR模型”,最后概述了VaR在金融界监管和风险控制等方面的应用。     

有效投资组合代理证券相对有效性

根据夏普（Ｓｈａｒｐｅ， Ｗ．Ｆ．）提出的资本资产定价模型──ＣＡＰＭ：市场证券组合是有效证券时，在证券期望收益率Ｒ和因子之间存在精确的线性关系。然而人们对此进行经验检验研究时，却难以证明这种关系以及其有效性。因为市场中包含的证券和资产的种数非常之大，人们在进行经验检验研究时使用的证券组合不可能是真正的市场证券组合，而只能是其代理、由于代理证券或多或少存在非有效性，因此，代理证券期望收益率产与８因子之间的关系、代理证券与有效证券之间的差异性以及代理证券的相对有效性及其度量的研究显得十分重要，本文…     

基于动态E-VaR模型的房地产收益波动性测度研究

基于房地产股票价格数据,针对现有大多数风险测度方法没有考虑到小概率、大损失的极端事件的现状,运用极值理论EVT和在险值VaR构造动态风险计量模型。Back-testing方法检验结果表明,基于动态E-VaR的市场风险测度方法对于指数收益率风险的度量具有较强的适用性。     

泊松过程在证券投资分析中的应用

本文视证券价格的波动为动态的泊松过程,对中国证券投资市场的证券价格的变化规律进行了分析。在此基础上,计算出泊松过程理论下的证券价格的期望值、证券投资收益率的期望值、收益率的方差。通过区间估计选择证券,对其建立证券市场的投资组合模型,从而判断证券市场中长期的总体走势方向,为证券投资者买卖决策提供新的参考依据。     

基于VaR的我国证券投资基金绩效评价方法

证券投资基金绩效的评价,不仅要考察基金的收益率,而且还要看它所承担的风险。投资基金绩效评价传统经典方法主要有特雷诺指数法、夏普指数法、詹森指数法及T-M模型、H-M模型。基于VaR的证券投资基金绩效评价方法——RAROC,这种经风险调整后的绩效评价方法能更客观、准确地反映证券投资基金的绩效。     

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.