温压战斗部爆炸冲击波毁伤小子样试验鉴定分析

针对温压战斗部爆炸冲击波毁伤的试验鉴定问题,提出冲击波毁伤的试验鉴定即为对毁伤参数所服从分布以及分布参数的统计推断问题,并进一步给出温压战斗部毁伤小子样试验鉴定的基本思路,重点对利用Bayes理论开展统计推断的方法进行了研究,介绍了两种验前分布的求取方法,并对Bayes估计理论进行了深入探讨,介绍了点估计和区间估计求取的具体方法。     

一种基于MCMC稳态模拟的贝叶斯索赔校正模型

Btihlmann模型是贝叶斯方法在经验费率厘定中最为著名的应用，然而该模型在结构参数先验信息不足的情况下，并不能得出参数的无偏后验估计。本文针对传统方法的不足，运用基于MCMC模拟的贝叶斯方法对历史数据进行校正，通过Gibbs抽样构造出一种多层Poisson模型稳态分布的马尔可夫链，动态模拟出索赔频率的后验分布以及缺失参数值的后验估计，改进了传统的索赔校正模型，提高了计算的精度。利用WinBUGS软件包进行建模分析，证明了该模型的直观性与有效性。     

非寿险精算中的贝叶斯信用模型分析

针对传统B櫣hlmann-Straub信用模型不能有效地解决缺失数据信息处理问题,本文利用贝叶斯统计方法,构造了一类新的贝叶斯信用分析模型,引入基于吉布斯抽样的马尔科夫链蒙特卡洛方法进行数值计算,建立了一个索赔后验分层正态模型进行实证分析,证明模型的有效性。研究结果表明,基于MCMC的贝叶斯信用模型能够动态模拟模型参数的后验分布,提高模型估计的精度,对保险公司经验费率厘定方法的改进具有重要的现实意义。     

似无关动态协整模型中的水平扭曲与校正

本文在解析似无关动态协整模型及其动态最小二乘估计的基础上,从理论上揭示了关于协整参数的假设检验存在严重的水平扭曲,即对协整参数约束的Wald检验统计量的渐近卡方分布存在严重的有限样本扭曲。进一步,本文应用自举抽样技术对水平扭曲进行了有效校正。基于本文的发现,我们建议在对似无关动态协整模型中的参数进行假设检验时,为保证结论的准确性,应使用自举抽样推断技术产生统计量值并由此来形成检验结论。     

复杂样本的方差估计——基于逆抽样设计的方法

复杂样本的方差估计，通常采用的是随机组、刀切法等传统方法，本文提出采用逆抽样设计方法。基于一个实际调查数据的模拟分析，通过对抽样方法进行逆设计，构造了对应的方差估计量，并从精度、灵活性等方面将逆抽样设计方法与传统方差估计方法进行多角度对比，探讨了该方法的适用条件。     

抽样决策的经济效益分析

一、贝叶斯(Bayes)抽样决策在风险型决策问题中,由于给出了状态参数的概率分布,故可利用期望值原则决策。但这样的概率分布(称为先验分布)往往是针对一般情况而言的。为了取得关于接受决策的特定对象的具体信息,可对该特定对象总体进行抽样,然后把先验信息与抽样信息结合起来做出决策。这就是著名的贝叶斯抽样决策方法。例如某公司的产品每500件装成一箱批发给商业部门。每箱次品率有10%、20%、30%三种,其概率分别为0.7、0.2、0.1。该公司面临的决策问题是:产品在出     

逐步增加的Ⅱ型截尾下双参数指数分布的可靠性分析

基于逐步增加的Ⅱ型截尾模型,讨论了双参数指数分布的可靠性指标的估计。导出了形状参数、尺度参数及可靠度函数的极大似然估计(MLE)和Bayes估计,最后运用Monte Carlo方法对Bayes估计和极大似然估计的MSE,进行了模拟比较。     

基于后验概率的共谋识别GA-SVM模型

共谋攻击已成为电子商务信任评价机制所面临的严重威胁。本文通过采用遗传算法对支持向量机中的两个参数进行全局寻优,并将标准SVM的决策值转化为后验概率输出,对样本属于共谋的概率进行估计,提出了基于GA-SVM后验概率输出的信誉共谋识别模型。经真实共谋攻击数据验证,所提出的模型可有效识别共谋攻击,ROC曲线下面积能达到0.954。     

企业产品出厂检验的决策——简介贝叶斯计数抽样检验方案

企业在决定自己所生产的产品是否能够出厂时,有三种可供选择的策略:其一,不经质量检验(以下称不检),直接让产品出厂;其二,对产品进行全数检验(以下称全检),剔除其中的不良品,其余良品出厂;其三,抽样检验部分产品(以下称抽检),根据抽检的判别准则和检验结果,当不良品出现较少时,令产品出厂,否则,让产品经过全检后再出厂。很明显,究竞选择何种策略,是一个决策问题,可以根据这三种策略(不检、全检、抽检),何种有最小的费用支出来决定对它们的取舍。下面对这一问题进行讨论,并由此引出贝叶斯(Bayes)计数一次抽样检验方案的数学模型,同时给出求解步骤,此外还将对有关问题做些简要说明。     

逐次定数截尾下Weibull分布参数的逆矩估计

基于逐次定数截尾样本下,讨论了两参数Weibull分布的参数估计,得到了两参数的逆矩估计.并利用模拟方法与极大似然估计作比较,模拟结果表明逆矩估计优于极大似然估计。     

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.