Cross-Border Migration of Hong Kong Residents Under the 'One Country, Two Systems' Policy

Hong Kong is known as a migrant city because its population was sourced from mainland China, and because there has always been outflows of people to overseas countries, especially from the mid-1980s to mid-1990s. Emigration to mainland China has become a significant recent trend. This article discusses this phenomenon in the theoretical contexts of migration and trans-border residential development. It contends that the trend will intensify more quickly than other cross-border movements because the two systems are separated by a political border within one country, and because there are common cultural ties and rapid economic integration.     

基于STL文件的Laplacian网格优化算法

针对直接重构得到且以STL文件格式存储的网格模型质量不高的问题, 提出了一种基于Laplacian坐标的网格模型全局优化算法。该算法在提高三角面片质量的同时可以很好地保持原网格模型的局部几何特征, 其核心思想是通过在最小二乘意义下求解由权重控制的包含顶点位置和拉普拉斯坐标双重约束的线性系统来对网格顶点进行重新定位。从实验结果可以看出, 该算法较以往的Lapacian优化算法在对网格细节特征的保持上有一定优势。     

一种基于PIM-SM的扩展组播路由EPIM-SM的设计

提出了一种基于PIM-SM的新的扩展协议EPIM-SM(extend to PIM-SM).该协议采用了一种新的算法代替PIM-SM用于RP选举的哈希算法,新协议提供这样一种机制:根据网络拓扑结构及组播源和成员的变化情况,为每个候选RPi估算其组播树整体代价,定期选择一个代价值最小的RP,以使组播树的代价始终保持接近最低.     

分析广东省气象局中心机房搬迁之注意事项

通信机房搬迁是气象信息网络运行维护工作中一项重难点工程,特别是在保证各个气象业务、信息系统运行的连续性下进行整体搬迁。该文对平日气象信息网络管理工作的各个要点进行研究,并阐述该要点在通信机房搬迁中的应用,提出机房搬迁中的注意事项。体现气象信息网络日常管理工作的重要性。     

太赫兹CSAR运动目标距离速度估计与重定位方法

圆周合成孔径雷达(CSAR)中,由于雷达平台绕观测场景圆周飞行,雷达和地面目标之间的距离方程复杂,目标的距离向参数和方位参数之间有复杂的耦合关系,导致单独估计动目标距离向速度参数的难度加大。提出一种基于子孔径分解的太赫兹CSAR运动目标距离向速度估计方法,选择合适的子孔径角度,对CSAR进行子孔径分解,在子孔径条件下,通过小角度近似,可以实现运动目标距离向速度和其他参数间的解耦合,准确估计运动目标的距离向速度,实现运动目标的精确重定位。仿真和实测数据验证了该算法的有效性。     

A modified advancing layers mesh generation for thin three-dimensional objects with variable thickness

A method of generating modified advancing layers mesh is proposed. In this paper the mesh generation process of semi-unstructured prismatic/tetrahedral mesh is presented for relatively thin three-dimensional geometries with variable thickness, as in the case of injection molding analysis. Prismatic meshes are generated by offsetting initial surface triangular meshes. During the mesh generation process, mesh quality is efficiently improved with the use of a new node relocation method. Finally, tetrahedral meshes are automatically generated in the rest of the domain. The mesh generating capability of the proposed algorithm is demonstrated with the several practical test cases.     

堆场集装箱翻箱的PCNN优化控制算法

集装箱的堆存状态与理想发箱顺序很难保持一致, 翻箱操作是不可避免的. 为降低堆场的翻箱率, 提高作业效率, 在获得集装箱的取箱顺序前提下, 将每取一个集装箱所产生的可能状态视为一个状态结点, 所需的翻箱次数加一个基数作为状态结点间的连接权, 把翻箱优化问题转化为最短路径求解问题. 脉冲耦合神经网络(Pulse-coupled neural network, PCNN)具有独特的自动波并行传播的特性, 适用于求解大规模实时问题, 能一次求出源点到其他所有目标点的最短路径, 从而获得最优的翻箱方案. 其所需要的计算量仅正比于最短路径的长度, 与路径图的复杂程度及路径图中的通路总数无关. 这为建立集装箱的智能控制系统奠定了坚实的理论基础.     

基于Transputer网络的进程迁移技术研究

进程迁移是分布式系统研究的重要内容，它对实现系统容错和负载平衡起到很重要的作用．本文描述了Ｔｒａｎｓｐｕｔｅｒ网络系统中进程迁移的设计思想、方法及技术实现．首先对所采用的硬件环境及整个容错并行操作系统的层次结构进行了介绍，然后对进程迁移所涉及的关键技术进行了详细讨论．该平台的建立为动态任务调度及容错处理等技术的进一步研究提供了强有力的支持．     

Neighbourhood Restructuring and Residential Relocation: Towards a Balanced Perspective on Relocation Processes and Outcomes

This introductory paper to this special issue of Housing Studies questions whether various characteristics of the debate and research on gentrification, displacement and restructuring justify a largely negative perspective on the processes and outcomes of ‘forced’ residential relocation. We argue that a proper and fuller consideration of issues around policy, context, process and outcomes enable researchers and commentators to avoid ready characterisations and self-fulfilling investigations of restructuring which serve to present it as a singular (and somewhat suspicious or conspiratorial) phenomenon. For this purpose, we present a broad conceptual framework for restructuring and relocation studies, based on these four themes. Subsequently, we review major issues in restructuring and gentrification discourses, and briefly reflect upon some of the factors underlying the negative loading of the term displacement. We also identify caveats in the evidence base of relocation studies, both in the United States and in Europe. Finally, we introduce the papers in this special issue. The overall aim of this issue is to offer a more open, balanced starting position for analysis of urban restructuring processes and relocation outcomes, particularly in relation to areas of social housing.     

建筑物滑动迁移中托架的优化分析

为探究建筑物滑动迁移方式中合理的托架设计形式,采用ANSYS软件对某框架结构建筑物建模,对比分析了8种不同形式的托架对迁移建筑物变形及受力的影响,同时优化了托架斜撑的截面尺寸,进而给出了一种较为合理的托架结构。结果表明:托架6具有变形小、受力状态良好、结构简单的特点,推荐作为优先采用形式;在合理形变量范围和安全强度内,托架斜撑截面尺寸大小可减小为原来的50%,且变形与受力状态良好。