网络加权Voronoi图的动态构建

当路段的位置关系很复杂时,加权网络Voronoi图是很难构建的。在传统的算法中,计算对象之间的距离必须选择最小距离为共同边界的权数,当路段交叉或重合,构建过程极其复杂,须单独考虑各部分的对象。本文我们给出网络Voronoi图的离散结构,该算法能克服上述缺点,比传统方法更有效,并给出应用实例,对该实例应用软件解决提供了有效的算法。     

一般图形Voronoi图的离散生成

由于一般图形形状和位置的任意性,一般图形Voronoi图往往比较复杂,难以将传统的构造法直接应用到一般图形Voronoi图的构造中。本文介绍了一般图形Voronoi图的离散构造法,并给出算法步骤及优势分析。     

基于加权Voronoi图的河南省城市影响区研究

通过选取与确定城市影响区有关的社会、经济、人口等指标,利用主成分分析法和断裂点理论,得到河南省38个城市单元的综合规模强度,在此基础上借助于加权 Voronoi 图生成算法,分别计算河南省38个城市单元影响区的变化.     

Voronoi图在足球机器人规划中的应用研究

Voronoi图是计算几何的一个重要分支,它在计算几何理论和应用中发挥着重要作用。在Voronoi图已有的理论基础之上,利用Voronoi图的几何特性分析并解决足球机器人的任务规划问题。     

乘权Voronoi图的构成及其在物流网点选取上的应用

乘权Voronoi图由于权值的设定公式非常复杂,在传统的算法中,当生成元或乘积发生改变时,程序运行会异常复杂。本文给出了乘权Voronoi图的动态构造算法,改进了传统算法的缺点,因而更省时高效,具有较高的理论价值。本文还给出乘权Voronoi图在北京市区选取物流网点时的应用。     

福建省加权网络应急物资储备点选址

文章在对应急物资储备点选址模型进行概述的基础上,对福建省应急物资储备点进行了分析。选择集合覆盖和加权网络作为理论基础实现储备点选址。并给出福建省应急物资储备点选址的最优方案和遍历应急系统所有区域所需要的时间。     

垃圾发电厂选址约束条件分析

从生态环境角度来讲,垃圾是污染物,但从资源方面看,垃圾是一种很有前景的可再生资源。利用垃圾作为燃料来进行发电,不但清理了工业生活垃圾,也满足了电量不足,为社会分担了一定的发电压力。其中,垃圾发电厂的选址直接关系到了整个垃圾发电厂以后的发展,有时会因为垃圾发电厂的选址引起社会问题并影响发电厂的建设。论文首先分析了垃圾发电厂选址存在的问题,提出了垃圾发电厂选址的目标和原则,并阐述了垃圾发电厂选址的步骤。然后,介绍了模糊认知图模型的理论和方法,分析影响垃圾发电厂选址的因素,建立了动态的因素影响模型,并确定了因素之间因果影响程度值的计算方法。最后,介绍了多目标优化模型的基本理论,在一定的假设条件下,从影响垃圾发电厂选址的技术、经济、环境和社会四个方面,分别建立子目标函数,确定了约束条件。     

考虑收益差异的多种生鲜农产品预冷中心双目标选址优化

文章从多种类型农产品从产地采摘后同时预冷角度出发,考虑不同农产品收益差异规划农产品产地预冷中心选址。结合多区域不同产品收益不同以及生鲜农产品易腐败的的特点,构建以覆盖产品总收益最大和保鲜成本、运输成本、时间惩罚成本等相关成本之和最小的双目标优化新模型。在模型求解时,利用线性加权法将双目标转化为单目标,采用混合编码方式,改进设计相应的遗传算法进行求解,最后以官山镇预冷前端布局为例进行实证分析。结果表明,所建立双目标优化模型对解决多种生鲜农产品选址研究具有借鉴意义,有效促进企业进行产地选址优化决策。     

动态需求下的多目标配送中心选址研究

为弥补现有选址模型未考虑需求变化的不足,研究了非确定性需求环境下的配送中心选址问题;运用随机机会约束规划为基本建模工具,建立了配送中心动态选址模型;模型不仅考虑最小化物流成本,而且考虑了最大满意度:运用主要目标法将多目标选址模型转化为单目标选址模型,并构造了相应的贪婪启发式求解算法,算例结果表明了模型和算法的有效性.     

动态需求下的多目标配送中心选址研究

为弥补现有选址模型未考虑需求变化的不足,研究了非确定性需求环境下的配送中心选址问题;运用随机机会约束规划为基本建模工具,建立了配送中心动态选址模型;模型不仅考虑最小化物流成本,而且考虑了最大满意度;运用主要目标法将多目标选址模型转化为单目标选址模型,并构造了相应的贪婪启发式求解算法,算例结果表明了模型和算法的有效性。     

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.