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。     

基于Power图的高铁建设对城市空间格局研究

Power图的生成元不再是点而是power球,即到给定两power球距离相等的面为超平面。一般图形Power图在地理信息系统及城市规划等方面有着重要应用,如行政区域的划分,边界的管辖区,资源有效利用的划分,交通道路规划、快递服务辐射范围等等。现仅以京沈高铁建设对城市空间格局分区为例,应用离散构造法生成其一般图形Power图,对其控制区域和覆盖状况进行简要分析。     

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。     

物流园区选址模型中的动态Voronoi图问题及评价

本文提出了物流园区选址的点和直线段加权Voronoi图的界定模型,改进了加权Voronoi图的以往局限性,实现了物流系统内空间服务范围的动态划分,构建了连续型直线段加权Voronoi图的选址模型,同时对选址模型进行分析及评价。     

基于点集凸包的Delaunay三角剖分实时算法研究

凸包作为计算几何的一种基本的数据结构,在计算几何设计方面有着十分重要的应用。本文采用坐标及单映射的算法来构建平面散乱点集的凸包。而点集的Delaunay三角化对三维曲面重构有着十分重要的应用,由于Voronoi图和Delaunay三角化的对偶性,一般通过构建点集的Voronoi图来构建Delaunay三角网,本文直接构建Delaunay三角剖分,该算法原理简单,稳定,易实现,尤其适合数据点较少的点集。     

构造法在微积分中的应用研究

构造法是把数学问题进行转化来解决问题,构造的对象数学形式有方程、函数、过程、图形、命题,或是一种模式。本文对构造法在微积分中的应用进行了研究,以深化构造法在数学中的应用。     

实数集分裂问题的NP难度证明

定义了实数集分裂问题,通过构造与二分图的最大权问题相应的图形模型,证明了实数集分裂问题是NP难的.     

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。     

一类特殊的实数集分裂问题的NP难度证明

定义了实数集分裂问题,并给出了一类特殊的实数集分裂问题.通过构造与二分图的最大权问题相应的图形模型,证明了这种特殊的实数集分裂问题是NP难的.     

Auto CAD三维实体向二维轴测图、三视图的转换

阐述了Auto CAD三维实体向二维轴测图、三视图的转换方法,运用Auto CAD绘制的三维实体图比轴测图、三视图更直观、更容易理解。对于一些复杂的相贯图形更是如此,并且三维实体图能够进行任意位置的剖切,更容易了解其内部构造,本文将详细说明如何将三维实体转换为二维轴测图、三视图,提高做图的效率和精确度。     

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.