Lane-following method for high speed autonomous vehicles

This paper presents a steering control method for lane-following in a vehicle using an image sensor. With each image frame acquired from the sensor, the steering control method determines target position and direction, and constructs a travel path from the current position to the target position either as an Arc-path or S-path. The steering angle is calculated from the travel path thus generated, and the vehicle follows the travel path via motor-control. The method was tested using a vehicle dubbed as KAV (Korea Autonomous Vehicle) along an expressway (Seoul Inner Beltway) trajectory with a variety of radii (50 m ∼ 300 m) while traveling at a speed of 60 km/h to 80 km/h. Compared with an experienced human driver, the method showed little much difference in performance in terms of lane-center deviation. The proposed method is currently employed for high speed autonomous driving as well as for stop and go traffic.     

低等级公路特长隧道半横向通风应用与探讨——九寨仙境隧道通风设计

双向行车的隧道通风,除了维持洞内空气的卫生标准和规定的视距外,还必须有利于火灾时的排烟和人车避难,这在特长隧道是很困难的。我国已建成的4 km以上的双向行车隧道,均采用有平行导洞的纵向式通风,但此种方式缺点很多。文章吸取了国外经验,提出采用半横向式通风,并对此种通风方式提出了一些改进意见及推导了应用公式。     

应用流式细胞术检测17β-雌二醇对H2O2诱导的视网膜神经细胞凋亡的保护作用

目的用流式细胞技术(FACS)检测H2O2诱导的视网膜神经细胞凋亡以及17β-雌二醇(βE2)对细胞的保护作用。方法取新生24 h内的SD大鼠进行视网膜神经细胞的原代培养,待细胞培养4-5 d,经不同因素处理后,用MTT法检测细胞存活率,用FACS法检测细胞凋亡率。结果200μmol/L的H2O2能有效诱导视网膜神经细胞凋亡;低浓度的H2O2不能诱导细胞凋亡,但高浓度的H2O2诱导细胞凋亡的同时也导致了正常细胞比率的锐减;10μmol/L的βE2能有效对抗H2O2诱导的视网膜神经细胞凋亡;低浓度的βE2对细胞未表现出保护作用,高浓度的βE2对细胞反而表现出毒性作用。结论一定浓度的βE2在一定范围内能对抗H2O2诱导的视网膜神经细胞凋亡,表现对神经细胞保护的作用。     

Sliding window method for vehicles moving on a long track

The rail is modelled as a simply supported beam in the vehicle–track coupled dynamics. The beam is formulated by a partial differential equation that is transformed into an ordinary differential equation by the method of mode superposition for numerical calculation. However, the size of the matrix that is formed by the mode-superposition method increases significantly with track length, which limits the calculation efficiency. Some methods have been developed to solve this calculation issue, but they diminish the merits of the vehicle–track coupled dynamics, which would systematically investigate the dynamics of a vehicle and a track from the entire vehicle–track system. A new method is developed to resolve this contradiction. First, a theory based on a sliding window is established to improve the computational stability with respect to the length and the window-movement ratio. Then, two methods, namely finite element method analysis and an analytical solution, are used to verify the accuracy of the new method, which is highly efficient when used in a vertical half-vehicle–track coupled model to calculate the vehicle response when the vehicle moves on a long track. The results of the vehicle response calculated with and without the sliding window show good consistency.     

Gasket life criteria at low temperatures adopting proportional compensation for loss of flexibility and conformability

In the automobile industry, the service life of gaskets is defined as the time until which a released gasket recovers 60 % of the original compression. It was observed that the recovery curves of gaskets were highly nonlinear at high temperatures, and relatively nonlinear at temperatures above the room temperature. However, it was also noted that the recovery curves of the gaskets at temperatures below room temperature exhibited linearity with respect to the ln(time). Automotive manufacturers demand gasket life criteria that exceed a specific time or the entire life of a car. In the case of gaskets used at lower temperatures, since materials encounter losses in its flexibility and conformability, the definition of service life specifying a 60 % recovery may not be sufficiently safe to eliminate possible leakages. In this study, new gasket life criteria that could be used at low temperatures were proposed. The new criteria were proposed based on the change in Young’s modulus of the gasket material in order to conserve the sealing capability.     

基于车联网技术的汽车服务系统

为了满足不同汽车用户的需求,解决现代交通所面临的安全、能源和道路堵塞问题,本文提出了一种基于车联网技术的汽车服务系统。系统采用B/S架构;搭配高兼容性终端;在主流操作系统下,基于J2EE规范,针对不同用户需求开发出多款应用软件。具有适应性强,支持跨平台操作的特点。本系统消除了客户端的使用限制,升级维护易于实现。     

地质选线在杭新景高速公路衢州段的应用实践

杭新景高速公路衢州段处于浙江省西部山区,该地区地质地貌复杂,不良地质类型多样,潜在地质灾害严重。在该高速公路路线设计阶段,贯彻地质选线的理念,进行多方案比选,对不良地质采取避让、处治等措施,不仅可有效降低工程造价,而且可以避免地质灾害的发生,为工程的建设和运营安全打下良好基础。     

基于手机信令数据的游客识别与出行轨迹匹配方法

为统计旅游交通的客运量，分析公路交通运输需求，优化运输组织，合理构建“快进慢游”综合交通旅游网络，研究提出基于手机信令数据的游客识别与出行轨迹匹配方法。通过划定景区边界，设置停留时间阈值，识别手机用户的游客身份；同时，借助地图工具批量计算信令发生位置间的出行路线与行程时间，匹配实际公路网。实例分析结果表明，手机信令数据能呈现手机用户的出行轨迹，且信令数据的位置轨迹与公路线位走向结合密切。在人们越来越依赖地图导航软件规划出行路径的背景下，利用该方法能更准确地识别景区游客并估计游客往来景区的出行路径。     

舰船技术保障信息系统功能需求

提升技术保障的信息化水平,能够提高技术保障的时效性、精确性.本文对舰船技术保障的特点、舰船技术保障信息化建设的内涵进行了分析,并从顶层对舰船技术保障信息系统的功能定位、需求进行了探讨.     

IP分布式联络中心与传统呼叫中心的比较

随着计算机及互联网技术的快速发展，基于IP的应用越来越多。IP分布式联络中心融合多种接入方式，便于实现分布式座席，降低网络设备投资，减少通信及人工成本，业务扩展性好，正在逐步替代传统的呼叫中心，并推动简单的电话呼叫中心向多媒体联络中心过渡。