广州地铁列车国产化牵引逆变器

介绍了广州地铁1号线车辆国产化牵引逆变器的主要技术参数、牵引／电制动特性、防空转／滑行特性,以及与车辆气制动系统的匹配。     

New Iris Localization Method Based on Chaos Genetic Algorithm

This paper present a new method based on Chaos Genetic Algorithm (CGA) to localize the human iris in a given image. First, the iris image is preprocessed to estimate the range of the iris localization, and then CGA is used to extract the boundary of the iris. Simulation results show that the proposed algorithms is efficient and robust, and can achieve sub pixel precision. Because Genetic Algorithms (GAs) can search in a large space, the algorithm does not need accurate estimation of iris center for subsequent localization, and hence can lower the requirement for original iris image processing. On this point, the present localization algirithm is superior to Daugman‘s algorithm.     

用户主导创新成就深圳地铁装备和运营服务国际领先

20世纪90年代,我国部分大城市的地铁发展初期利用国外贷款,导致建设成本居高不下。1995年国家出台加强地铁设备国产化工作的政策,深圳地铁开始了设备自主创新的发展历程,提出顶级需求,立足工程应用,主导自主创新,采用信息技术,利用后发优势,实现超越价值的装备创新路径。经过20年的发展,深圳地铁已经在地铁装备和运营服务方面实现国际领先,在信息化技术、安全自动控制水平、运营的安全可靠性、节能等方面取得了领先,并实现了维护费用降低、出口实现突破、运营服务优秀、运营成本低等成绩。其核心优势是创造了"用户主导创新"的理论和模式。     

不负众望 不辱使命——改革开放30周年对斯太尔技术引进项目的思考

通过回顾斯太尔项目的前期论证、技术文件的中国化、学习和运用引进技术中蕴含的先进理念和工作方法、在消化吸收引进技术的基础上的自主开发、建立社会化的供应链等关键环节的操作,系统地总结了实施斯太尔项目的成功经验.     

第一套全国产化信号系统在大连快轨3号线中的应用

目前国内各城市地铁和轻轨的信号系统主要采用国外设备.大连快轨3号线率先在国内信号领域采用了一套全国产化的信号系统.介绍了该信号系统的组成、特点、功能及在大连快轨3号线中的应用.系统开通至今4年,运行稳定可靠,为国内城市轨道交通信号系统实现国产化,提供了一条新思路.     

城市轨道交通列车绝对定位系统比较

为选用更适合城市轨道交通应用环境的列车绝对定位系统,对两种常用的制式——欧式应答器系统和美式信标系统进行研究。从系统组成和工作原理入手,对比分析其车载定位设备的性能参数,轨旁定位设备的物理特性、烧录信息、点式ATP运营模式的构建,以及车地射频接口的物理层和逻辑层的实现方式。研究表明:与美式信标系统相比,欧式应答器系统技术更成熟,功能更强大,在城市轨道交通领域应用时可提供更高的灵活性。     

基于多传感信息融合的智能车辆定位方法

针对高精度定位系统中地图的重要性问题,将定位问题分为无地图定位与基于地图定位,分别对智能车辆的定位问题进行探索.对研究的智能车辆、传感器及其定位问题进行建模分析,再对该平台实施传感器校准以减小系统误差.对于无地图定位问题,利用扩展卡尔曼滤波算法将里程计与惯性测量单元(IMU)数据相融合,通过试验证明航迹推测法存在累计误...     

Towards lane-level traffic monitoring in urban environment using precise probe vehicle data derived from three-dimensional map aided differential GNSS

Today's urban road transport systems experience increasing congestion that threatens the environment and transport efficiency. Global Navigation Satellite System (GNSS)-based vehicle probe technology has been proposed as an effective means for monitoring the traffic situation and can be used for future city development. More specifically, lane-level traffic analysis is expected to provide an effective solution for traffic control. However, GNSS positioning technologies suffer from multipath and Non-Line-Of-Sight (NLOS) propagations in urban environments. The multipath and NLOS propagations severely degrade the accuracy of probe vehicle data. Recently, a three-dimensional (3D) city map became available on the market. We propose to use the 3D building map and differential correction information to simulate the reflecting path of satellite signal transmission and improve the results of the commercial GNSS single-frequency receiver, technically named 3D map-aided Differential GNSS (3D-DGNSS). In this paper, the innovative 3D-DGNSS is employed for the acquisition of precise probe vehicle data. In addition, this paper also utilizes accelerometer-based lane change detection to improve the positioning accuracy of probe vehicle data. By benefitting from the proposed method, the lane-level position, vehicle speed, and stop state of vehicles were estimated. Finally, a series of experiments and evaluations were conducted on probe data collected in one of the most challenging urban cities, Tokyo. The experimental results show that the proposed method has a correct lane localization rate of 87% and achieves sub-meter accuracy with respect to the position and speed error means. The accurate positioning data provided by the 3D-DGNSS result in a correct detection rate of the stop state of vehicles of 92%.     

准确定位是基础办出特色是关键——交通高等职业教育办学定位的思考

明确其定位,才能进一步规范和促进交通高等职业教育健康、持续发展;办出特色,才能适应就业市场的实际需要。文中结合二级学院的实际情况提出正确定位要考虑的3个原则,必须把握的8个定位,办出特色的6个努力方向。     

人乳头瘤病毒16型(湖北株)E7蛋白在NIH/3T3细胞中的表达和定位

目的　将带有人乳头瘤病毒 1 6型 (湖北株 )E7基因的真核表达载体 pL(E7 HB)SN导入NIH/3T3细胞进行瞬时表达。方法　重组质粒转染 3T3细胞通过DNA 磷酸钙共沉淀法 ;E7基因表达的检测采用RT PCR和间接免疫荧光实验。结果　E7基因导入真核细胞后能有效转录并表达E7蛋白 ,通过免疫荧光染色可看到E7蛋白主要定位在胞浆中 ,细胞核中也有 ,但量较少。结论　这可能和湖北株HPV1 6E7基因发生突变有关。