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。     

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Voronoi图的家电回收逆向物流系统的研究

以TCL集团公司的销售物流网络为研究对象,建市了基于专业化回收中心的家电回收逆向物流的网络体系及其逻辑和功能结构;提出了Voronoi分割模式下回收中心选址及服务域划分的几何方法,并且研究了运输路线的选择算法,并将二者集成到家电回收逆向物流系统中;最后给出应用实例.提出解决方案,完成逆向物流管理信息系统的实用软件没计.     

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。     

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。     

空间权重矩阵的设定方法研究

空间权重矩阵作为实际观测数据到空间计量模型的映射,使得空间溢出效应的量化成为可能,是当前计量经济学的研究热点。空间权重矩阵设定方法的研究逻辑是首先对外生构建的空间权重矩阵基于邻接关系和距离函数进行分类研究,针对不同结构的空间单元进行多种设定方法的适用性分析,进而讨论利用Voronoi图构建离散点空间权重矩阵的应用方法。研究发现,实证分析中应针对具体问题和不同的空间单元,设定多个空间权重矩阵,并进一步检测不同设定方法对模型估计结果的影响以及不同形式矩阵的敏感性。     

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。     

基于改进二部图与专家信任的混合推荐算法

针对传统协同过滤算法出现的稀疏数据、用户冷启动等问题以及复杂网络结构的广泛应用,本文提出结合改进的二部图与改进的专家信任算法来提高推荐准确度。基于普通二部图算法,将用户对项目的评分作为节点之间的分配资源权重,不仅关注用户与项目之间的联系,同时体现用户对项目的喜好程度;其次,本文根据用户的评论数和与该用户对项目评分相同的数目来判断该用户的专家信任度,改进传统系统过滤算法。为了提高推荐准确度,改进缺点,我们将两者算法进行加权混合,加权因子根据实验中最小MAE值对应的权值来确定,形成混合推荐算法。最后针对基于用户的协同过滤、传统二部图以及本文提出的混合算法计算MAE值和平均Hamming距离,对比分析本文算法的推荐准确度与多样性,实验表明本文方法推荐效果较好,准确率高,个性化强,有研究和应用价值。     

基于对象秩的概念格生成算法

在引用概念格基本概念的基础上,提出了对象秩的概念,得到了概念格中的任一概念或者由对象集中的单个对象生成,或者由两个概念的并生成的结论,并给出一个求形式背景的所有概念的算法。实例表明该算法是有效的。     

浅析Dijkstra最短路径算法在消防力量调集中的应用

文章从我国的火灾形势出发,以优化城市道路交通网中路段的权值为出发点,结合消防工作实际情况的特点,介绍了消防力量调集路径最优指标的选取方案,着重分析了Dijkstra最短路径算法的基本原理,并给出了算法优化方案。优化后的算法能够有效降低Dijkstra算法的时间复杂性,提高运行效率。实例应用表明,该方法兼具灵活性和实用性,能够满足消防灭火救援工作中实现消防力量优化调集的要求。     

Random Sets: Models and Statistics

This paper surveys aspects of the theory of random closed sets, focussing on issues of practical and current interest. First, some historical remarks on this part of probability theory are made, where the important role of Georges Matheron is emphasized. Then, fundamental characteristics of the distribution of random closed sets are introduced. The very important Boolean model serves as an example for discussing mathematical and statistical problems. A number of further models is then considered, namely excursion sets of random fields, the system of edges of the Poisson Voronoi tessellation and various random systems of non-overlapping spheres. Finally, some ideas of particle statistics are presented, including some models of random compact sets.     

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.     

Ansätze und Ergebnisse anglo-amerikanischer M&A-Forschung

Based on a review of established U.S. management journals (1995–2003), six schools of thought are identified within the Anglo-American M&;A research: “Capital Market”, “Principal/Agent”, “Industrial Organization”, “Organizational Behavior”, “Human Resources” and “Strategic Management”. The literature review shows that the definition of M&;A success, the methods applied, and insights from empirical research differ according to the respective school of thought. Empirical studies focus on the resource combinations of merger partners, the specific circumstances of merger negotiations, and on integration management as antecedents of merger performance. Unfortunately, empirical findings have not yet provided reliable explanations for M&;A success. Based on the current state of Anglo-American M&;A research, the authors discuss implications for business practice, identify research gaps, and propose areas for future research.