Real time detection of driver attention: Emerging solutions based on robust iconic classifiers and dictionary of poses

Real time monitoring of driver attention by computer vision techniques is a key issue in the development of advanced driver assistance systems. While past work mostly focused on structured feature-based approaches, characterized by high computational requirements, emerging technologies based on iconic classifiers recently proved to be good candidates for the implementation of accurate and real-time solutions, characterized by simplicity and automatic fast training stages.In this work the combined use of binary classifiers and iconic data reduction, based on Sanger neural networks, is proposed, detailing critical aspects related to the application of this approach to the specific problem of driving assistance. In particular it is investigated the possibility of a simplified learning stage, based on a small dictionary of poses, that makes the system almost independent from the actual user.On-board experiments demonstrate the effectiveness of the approach, even in case of noise and adverse light conditions. Moreover the system proved unexpected robustness to various categories of users, including people with beard and eyeglasses. Temporal integration of classification results, together with a partial distinction among visual distraction and fatigue effects, make the proposed technology an excellent candidate for the exploration of adaptive and user-centered applications in the automotive field.     

基于驾驶人特性的双车道跟驰模型稳定性分析

为了研究交通拥堵问题，了解交通拥挤形成的过程及驾驶员自身特性对双车道交通流稳定性的影响.本文基于复杂网络聚类同步理论，对一类基于驾驶员特性的双车道跟驰模型的稳定性进行研究. 通过设计适当的控制器使得基于驾驶人特性的双车道车辆跟驰模型趋于稳定，并得到了模型稳定性的条件.此外，在双车道上的车辆受到随机外部扰动的情形下，利用具有外部扰动的复杂网络自适应H∞ 聚类同步理论，研究了外部扰动情形下基于驾驶人特性的双车道车辆跟驰模型的稳定性.最后，采用MATLAB仿真技术进行数值模拟，验证所设计控制器对双车道交通流稳定性的影响及不同的驾驶员性格特性对交通流运行的影响.     

城市道路交叉口借道右转车道设置方法

为了弥补交叉口空间布局中对借道右转车道研究的不足,分析了借道右转车辆在两相邻交叉口间的运行过程,将两交叉口间距分为四部分。采用波动理论、考虑驾驶员的操作顺适性以及采用概率论方法,建立了借道右转的右转车道适宜开口位置模型、借道右转的绿化带开口长度模型和路段右转车辆的合流段长度模型,在此基础上得到了实施借道右转的两交叉口最小间距模型。实例分析表明,所得模型符合两相邻交叉口间的交通流运行实际,对于判断两相邻交叉口是否适合于设置借道右转,以及设置借道右转时如何对各构成部分进行分析具有指导意义。     

受电弓主动倾摆系统的研究

通过对摆式电动车组受电弓主动倾摆系统的分析,建立ADAMS-Matlab控制模型,并对其控制特性进行仿真。结果表明该受电弓主动倾摆系统有良好的频率响应特性;在车体倾摆过程中,受电弓主动倾摆系统能有效减小受电弓滑板中点的横向位移,从而保证列车受流的连续性。     

Phase change analysis of an underwater glider propelled by the ocean＇s thermal energy

The phase change characteristic of the power source of an underwater glider propelled by the ocean＇s thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process, but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees, the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change, and the slope of the temperature time history curve remains the same. However, the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size, boundary conditions, and the power source＇s cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38ram needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.     

东平水道水文动力条件的变化

本文根据东平水道沿程水文(位)站多年水文资料的分析,研究了东平水道上世纪60年代以来水文动力条件的变化。研究表明,东平水道在上世纪90年代以前,水文动力条件变化不大,但在这之后,发生了较大的变化,主要表现在:流量加大、水位降低、含沙量略有减小,悬移质输沙量增大、潮汐作用增强。     

船舶电力推进变频输出电压谐波抑制研究

根据船舶电力推进变频驱动的特点,提出了一种新型变频器输出混合有源正弦波滤波器,在变频器的输出侧接上一个LC基波串联谐振电路,使变频器的输出电压对基波呈现低电抗、对谐波呈现高阻抗;同时实时检测负载端电压,根据瞬时无功功率理论可直接检测出谐波电压波形,并通过变流器和串联变压器反馈一个与谐波电压幅值相等、相位相反的电压去抵消系统中剩余的谐波电压。阐述了新型变频器输出混合有源正弦波滤波器的结构和工作原理,分析了滤波器的谐波抑制原理,给出了滤波器的仿真结果及分析。仿真结果表明:此滤波器设计新颖、结构简单、可靠性高,在各种工况条件下都能得到优化的滤波效果,很好地改善变频器的输出电压波形。     

电气化铁道用有源电力滤波器方案研究

概述了电气化铁道谐波问题现状，介绍了采用有源滤波器解决牵引网谐波干扰的几种方案。针对各个方案的特点，优选出了一种较适合电气化铁道用的有源滤波器方案。     

细看2004年水上危险货物运输管理要求的变化及对策

2004年1月1日,《港口法》、《港口危险货物管理规定》和《船舶载运危险货物安全监督管理规定》同时生效,调整了水上危险货物运输的管理,本文试就这些变化和对策做了一些探讨,供同行们参考。     

西藏墨脱高等级公路工程地质遥感勘察及GIS应用

运用遥感及地理信息技术能有效地从图像光谱特征、空间特征、影像纹理、微地貌、景观等诸多方面,对岩石、构造、地形地貌、地质灾害等进行识别与划分,从遥感影像中提取公路工程地质信息.结合ENVI和ARC/INFO软件进行数据采集和专题制图,利用GIS的空间分析功能,能快速、准确地对公路工程地质条件进行定量分析和综合评价.