Experimental validation of connected automated vehicle design among human-driven vehicles

In this paper, we present results regarding the experimental validation of connected automated vehicle design. In order for a connected automated vehicle to integrate well with human-dominated traffic, we propose a class of connected cruise control algorithms with feedback structure originated from human driving behavior. We test the connected cruise controllers using real vehicles under several driving scenarios while utilizing beyond-line-of-sight motion information obtained from neighboring human-driven vehicles via vehicle-to-everything (V2X) communication. We experimentally show that the design is robust against variations in human behavior as well as changes in the topology of the communication network. We demonstrate that both safety and energy efficiency can be significantly improved for the connected automated vehicle as well as for the neighboring human-driven vehicles and that the connected automated vehicle may bring additional societal benefits by mitigating traffic waves.     

Stability analysis on a dynamical model of route choice in a connected vehicle environment

Research on connected vehicle environment has been growing rapidly to investigate the effects of real-time exchange of kinetic information between vehicles and road condition information from the infrastructure through radio communication technologies. A fully connected vehicle environment can substantially reduce the latency in response caused by human perception-reaction time with the prospect of improving both safety and comfort. This study presents a dynamical model of route choice under a connected vehicle environment. We analyze the stability of headways by perturbing various factors in the microscopic traffic flow model and traffic flow dynamics in the car-following model and dynamical model of route choice. The advantage of this approach is that it complements the macroscopic traffic assignment model of route choice with microscopic elements that represent the important features of connected vehicles. The gaps between cars can be decreased and stabilized even in the presence of perturbations caused by incidents. The reduction in gaps will be helpful to optimize the traffic flow dynamics more easily with safe and stable conditions. The results show that the dynamics under the connected vehicle environment have equilibria. The approach presented in this study will be helpful to identify the important properties of a connected vehicle environment and to evaluate its benefits.     

皮层下缺血性脑血管病CT表现与血管性痴呆的相关研究

目的　探讨皮层下缺血性脑血管病CT表现与血管性痴呆之间的关系。方法　对比分析 6 0例皮层下多发脑梗死痴呆者和 6 8例皮层下多发梗死无痴呆者CT表现。结果　痴呆组中额叶皮层下、内囊前肢、尾状核、半卵圆中心前部、侧脑室体旁前部白质及丘脑梗死发生率、平均梗死灶数目及平均梗死体积均大于对照组 (P <0 .0 5 ) ;3级、4级脑白质疏松出现率显著高于对照组 (P <0 .0 5 ) ;脑萎缩指数测量值明显大于对照组 (P <0 .0 5 )。非条件Logistic回归分析额叶皮层下及丘脑梗死灶数目、侧脑室体旁前部白质梗死灶体积、脑白质疏松以及脑皮层萎缩的程度与血管性痴呆的发生显著相关。结论　皮层下多发脑梗死性痴呆与梗死灶的部位、数目、体积和脑白质疏松及脑皮质萎缩的程度密切相关     

基于DS18B20的温度实时采集与显示系统的设计与实现

本文介绍了基于DS18820的温度实时采集与显示系统的设计与实现。设计中选取单片机AT89S52作为系统控制中心,数字温度传感器DS18820作为单片机外部信号源,精度较好的液晶显示模块1602显示温度。在软件方面利用C语言编程控制单片机,完成对DS18B20与AT89S52的控制,最终实现温度的实时采集与显示。     

基于Intel PXA26X处理器的BootLoader的设计与实现

介绍了基于PXA26X处理器构造的高端手持嵌入式产品的BootLoader的设计与实现．简要介绍了PXA26X处理器的芯片结构,给出了一种基本手持设备的硬件结构框．说明了BootLoader的整体框架结构,给出流程图,并详细讲解了调试硬件遇到的关键问题和与操作系统配合的方法．     

基于ARM的嵌入式虚拟示波器系统的设计

基于ARM技术，以S3C44BOX为CPU，在uClinux基础上，通过USB设备来连接装有Labview的PC机，设计了一种嵌入式虚拟示波器系统．uClinux是一种运行于没有MMU的嵌入式微处理器的Linux衍生操作系统，实现了多任务运行．介绍了虚拟示波器的概念及Labview的特点和工作过程．     

谈基于CDMA1X的海事虚拟拨号专网(VPDN)的实现

现代信息技术正在以前所未有的速度蓬勃发展，它正在从根本上改变人们的传统理念和思维方式。现代信息技术的发展给海事事业在管理方面带来了机遇和挑战，如何利用好信息化技术实现海事工作的跨越式发展，是每个海事员工应积极思考的问题。交通部海事局提出：“对辖区海事各项业务进行数字化综合管理”，实现海事业务管理向信息化、数字化和现代化的转变。因此，利用计算机网络技术、无线通讯技术、流媒体技术实现数字移动办公在海事工作中是极其重要的。通过联通无限CDMA1X高速无线上网与海事内部专用网络建立虚拟拨号专网（VPDN）连接是实现数字移动办公的一个比较理想的选择。     

高速机车司机室的设计分析与计算

应用人机工程学理论及有关标准，总结以往的设计经验，提出一套较完整的司机室设计思路和计算方法，使司机室设备布置简统化，功能、造型完善和谐，富有美学效果。     

盾构机在不同地层中的掘进

针对泥水盾构在软岩和硬岩中掘进的实际情况,分析岩层对掘进的影响,给出软岩和硬岩中的掘进参数,并进行比较;分析泥水盾构在不同地层中掘进时遇到的特殊情况,根据有利于施工和延长设备使用寿命的原则,提出解决办法.     

机车抱轴箱的全参数化设计研究

如何使设计的零部件满足实际的需要是产品设计的关键。运用SolidWorks软件实现某机车抱轴箱的全参数化造型设计。详细地介绍了抱轴箱的三维造型全过程 ,并介绍了运用三维软件建模的一些体会