沪昆线自动闭塞方向电路的改进建议

沪昆线使用复线自动闭塞方向电路，在安全防护上尚有缺陷。例如：当区间空闲时，接车站可以随意改变区间方向变成发车站，使得原发车站茫然不知。2005年，沪昆线娄底车务段普安堂站曾发生一起事故因为错误办理进路，改上行的接车方向为发车方向，影响了邻站上行出站信号机不能正常开放，而其上行邻站处理不当，仍按照出发信号机故障发出列车，采用绿色许可证进行行车。由于上行改成了反方向，棋梓桥至普安堂上行区间信号机灭灯，构成行车事故。     

集装箱装卸货物搭板机构分析与设计

集装箱装卸货物搭板机构是大型集装箱与月台之间的连接装置.对大型集装箱装卸货物时,对200kg以下的较轻货物,可以人工搬运,而对较重的货物,如500kg甚至1t以上的,则必须借助叉车或其他辅助工具使之进入箱体内,进行装卸.     

浅析武汉轻轨供电线路测试与自动重合闸原理

阐述武汉轻轨直流牵引供电馈线开关柜的线路测试与自动重合闸工作原理。     

关注铁路产品过程能力风险 提高质量管理体系有效性和效率

论述了关注铁路产品过程能力风险的必要性,主张在过程能力管理中积极应用过程能力指数方法,准确理解确认过程中为过程的评审和批准所规定的准则,扩展确认过程的范围,通过强化过程能力管理,提高质量管理体系的有效性和效率。     

Equity based land‐use and transportation problem

Due to additional trip production by land use development, the O‐D travel costs between some O‐D pairs may also change intuitively. This leads to positive and negative impacts on network users traveling between different O‐D pairs. Therefore the equity issue about the benefit distribution gained from the land‐use development problem is raised. This paper proposes an Equity based Land‐Use Transportation Problem (ELUTP) which is intended to examine the benefit distribution among the network users and the resulting equity associated with land‐use development problem in terms of the change of equilibrium O‐D travel cost. In the resulting bi‐level programming model, the upper level sub‐problem maximizes traffic production incorporating equity constraints, while the lower level sub‐problem is a combined trip distribution/assignment user equilibrium problem. Genetic algorithm based method is applied to test the models using an example network.     

An extended generalized filter algorithm for urban expressway traffic time estimation based on heterogeneous data

Travel time estimation and its variation for urban expressways are vital to both the information provision to road users, and the system evaluation and management for traffic administrators. Fruitful research efforts have been made to develop methodologies of reconstructing spatiotemporal traffic states mainly for freeways based on one or multiple data sources. However, few studies specifically focused on urban expressways. There are more intensive merging and diverging traffic due to short distances between ramps, for example, 300–500 m. Based on the empirical analysis of traffic data collected on a typical segment of a congested urban expressway, this study proposes an extended generalized filter algorithm for the urban expressway traffic state estimation based on heterogeneous data. More specifically, the multiple sources of data include both fixed sensor data (e.g., inductive loops or radar data) and global positioning system (GPS) probe vehicle data. This study compares the proposed algorithm and the traditional algorithm for freeways using data collected on the segment of expressway in Beijing, China. Results demonstrate the advantage of the proposed method, as well as its feasibility and effectiveness.     

混凝土保护层厚度施工允许偏差

钢筋腐蚀是造成水运工程钢筋混凝土破损的主要原因之一,混凝土保护层是保证钢筋延迟开始腐蚀时间的重要屏障。文中对混凝土保护层厚度施工允许偏差的确定进行了研究和讨论,以合理有效地控制混凝土保护层厚度施工允许偏差,提高水运工程混凝土结构使用寿命。     

基于Top-Hat-Canny的汽车前视摄像头图像边缘检测方法研究

针对汽车前视摄像头(Forward View Camera)拍摄存在噪声及光照不均匀的问题,提出一种基于顶帽算法TopHat Canny的多重边缘检测图像预处理方法。通过对前视摄像头拍摄的道路行人、车辆及障碍物的图片进行分析,采用小波阈值算法分别对彩色图像(Red-Green-Blue,RGB)3个空间分量进行滤波去噪,并经加权平均法对重组的3个分量灰度化处理后,采用Top-Hat-Canny多重边缘检测方法对图像进行处理。实验仿真结果表明:该方法可以有效地解决噪声及光照不均对图像边缘检测带来的影响,为后续目标识别工作提供基础。