Global Solutions and Exponential Stability of Stochastic Functional Differential Equations with Infinite Delay

This paper proves that, under the local Lipschitz condition, the stochastic functional differential equations with infinite delay have global solutions without the linear growth condition. Furthermore, the pth moment exponential stability conditions are given. Finally, one example is presented to illustrate our theory.     

基于视觉及TLC概念的车辆跑偏检测方法研究

利用车载CCD摄像机获取道路图像,采用Sobel边缘检测技术获得含有道路边缘信息的图像,运用Hough直线检测原理检测出左右车道线.根据摄像机在车辆上的安装位置和俯仰角,建立图像坐标到世界坐标的变换关系,提取前轮外沿离最近车道线的距离;再应用国际通用的方法,根据车速估算出从当前时刻到前轮外沿触碰车道线的时间(TLC)并据此发出跑偏告警.以换道模拟跑偏驾驶的试验表明此方法可行、有效.     

重庆摩托车产业遭受技术性贸易措施的调查分析

我国加入世贸组织后。世贸各国依据世贸原则设置的技术性贸易措施给我国产品出口带来了不少困扰,及时掌握摩托车出口企业遭受国外技术性贸易措施情况,反映他们对政府相关政策和研究机构相关工作的诉求,有利于促进技术性贸易措施预警通报工作,完善地方预警机制的设置,更好地为企业服务。     

在南京地铁洞外平面首级控制网复测中的应用

介绍了将GPS静态测量技术应用于地铁首级控制测量中,能够达到高精度、高效益、大大提高作业效率及降低劳动强度等目的,对整条地铁线路的正确贯通提供了强有力的保障。     

Global logistics city concept: a cluster-led strategy under the belt and road initiative

This paper develops a cluster-led strategic policy framework to assess the strategic positioning of key global logistics cities in Asia, most of which are affected by the ‘Belt and Road (B&R) Initiative.’ One of the key challenges that the B&R Initiative is facing is underdeveloped logistics infrastructure in Asia, not to mention road congestion, dilapidated infrastructure, incessant supply chain disruptions, and capacity constraint, which imposes significant economic costs.

Global logistics cities are evaluated on logistics infrastructure capacity and service responsiveness. This involves selecting the key global logistics cities, identifying key indicators, standardising and indexing, mapping dimensions of global logistics cities, and developing the cluster-led strategic policy framework.

The results indicate the prevalence of a multi-tier system wherein Shanghai and Hong Kong have attained the maturity of a global logistics city, whilst Manila, Jakarta, and Bangalore are making slow but steady progress in that direction. In contrast, Dhaka, Phnom Penh, and Ho Chi Minh City are showing potential but require further enhancement through significant investment in infrastructure and service delivery improvement.

The cluster-led strategic policy framework formulates actions and strategies through which emergent logistics networks can be strategically aligned and functionally integrated with B&R-oriented global trading hubs and transport corridors..     

基于 Global Mapper 的中小流域暴雨洪水分析

近年来, 随着城市化的发展,基础设施的建设规模日益扩大。道路设计过程中的桥梁和涵洞布设需要满足防洪要求,构筑物设计前必须经过桥涵水文计算, 其是确定桥梁跨径、 涵洞孔径的基本参数之一。桥涵水文计算前的重要基础工作是进行现场洪水调查, 获得流域的汇水面积。汇水面积一般在实测地形图上根据分水岭勾勒, 但项目推进过程中尤其是前期方案阶段,很难获得大比例的地形图。网上的卫星地图是可以参考的资源之一,利用Global Mapper软件, 结合某市政道路工程,进行流域汇水面积计算, 利用《四川省中小流域暴雨洪水计算手册》中的暴雨推理法,计算暴雨流量, 并以某桥跨布设进行过流断面复核。     

北京地铁超速防护设备的校时系统

北京地铁2号线超速防护设备(ATP)的本地时钟一直依靠人员进行设定,导致各列车之间时间不统一且误差很大,对行车调度、故障诊断等方面有很大影响.为此,开发基于无线通信的地车校时系统,利用全球定位系统(GPS)的标准时间,自动为车载设备提供精确的统一时间,实现地铁列车时钟的协调一致,提高运营的安全性和可靠性.     

空间异质性建成环境对出租车与地铁竞合关系的影响

建成环境对出行方式的影响已有丰富的研究成果，然而对不同出行方式间相互关系影响的研究仍不够细致。本文以网格化的形式细化研究区域，采用土地利用属性和交通属性的六小 类要素作为特征变量刻画城市建成环境的特征。基于出租车行程的OD点与地铁站点的空间关系，将出租车与地铁竞合关系表征为 SCPE(Subway-competing,与地铁竞争)方式、SE(Subwayextending，延伸地铁)方式和SC(Subway-complementing，补充地铁出行)方式，并利用多尺度地理加权回归研究建成环境对竞合关系(SCPE、SE、SC)的影响机理及其空间效应。针对兰州市的案例研究表明：SCPE、SE、SC方式具有显著的空间异质性；多尺度地理加权回归能够刻画SCPE、 SE、SC方式与建成环境间依赖关系的空间异质性及其尺度差异，其估计结果更为可靠；建成环境各要素对SCPE方式的影响较为平稳，SC方式对公交站点密度和道路密度要素非常敏感，存在高度的空间异质性，SE方式亦对公交站点密度要素非常敏感。     

A two-stage approach to modeling vacant taxi movements

In this paper, a two-stage modeling approach is proposed to predict vacant taxi movements in searching for customers. The taxi movement problem is formulated into a two-stage model that consists of two sub-models, namely the first and second stage sub-models. The first stage sub-model estimates the zone choice of vacant taxi drivers for customer-search and the second stage sub-model determines the circulation time and distance of vacant taxi drivers in each zone by capturing their local customer-search decisions in a cell-based network within the zone chosen in the first stage sub-model. These two sub-models are designed to influence each other, and hence an iterative solution procedure is introduced to solve for a convergent solution. The modeling concept, advantages, and applications are illustrated by the global positioning system data of 460 Hong Kong urban taxis. The results demonstrate that the proposed model formulation offers a great improvement in terms of root mean square error as compared with the existing taxi customer-search models, and show the model capabilities of predicting the changes in vacant taxi trip distributions with respect to the variations in the fleet size and fare. Potential taxi policies are investigated and discussed according to the findings to provide insights in managing the Hong Kong taxi market.