Empirical approaches to combining revealed and stated preference data: Some recent developments with reference to urban mode choice

This paper replaces the nested logit ‘trick’ used in estimation of a modal choice model, when stated preference (SP) and revealed preference (RP) data are pooled, with an error component mixed logit model that can (i) relax the IID condition attached to subsets of alternatives in nested logit models, (ii) accommodate correlated observations, and (iii) reveal the relevant scale parameter for subsets of alternatives. Such a model can also incorporate state dependence between data types and preference heterogeneity on observed attributes. An example of choice among bus, train and car modes illustrates the difference in empirical evidence, especially elasticity outputs.     

缸内直喷的丰田卡罗拉1.2T怠速不稳解析

一辆2020款丰田卡罗拉1.2T汽车,行驶里程为1000KM,出现怠速不稳甚至熄火,经过专用诊断仪测试,汽车的高压燃油压力最高为16MPA,小于正常的20PMA,而且高压压力值随着怠速时间延长逐渐下降,甚至达到0.2MPA,启动时不容易着车,反复启动着车正常,高压压力无规律波动,更换高压油泵故障仍出现,高压油泵属于日本两个汽车配件厂生产,此故障曾在同类车型出现,丰田制造厂已经启动调研程序。     

The future of road safety: A worldwide perspective

Estimates by the World Health Organization suggest that, on a yearly basis, road crashes kill 1.25 million people—nearly 3400 road fatalities per day—and injure up to 50 million. Traffic injuries are not equally spread over the world, however; some countries are hit harder than others, and the chance of being killed in a road crash depends on where one lives. Almost 90% of all traffic casualties occur in low- and middle-income countries (LMIC). Globally, the number of fatalities per 100,000 population (mortality rate) ranges from less than 3 to almost 40. The rate is less than 9 in high-income countries (HIC) but averages around 20 in LMIC, with the African region demonstrating the highest rate (26.6). While road safety trends have been positive in HIC over the last few decades, trends in LMIC are not telling a positive story: road fatalities are expected to increase to almost 2 million road fatalities per year by 2020.The United Nations has adopted several resolutions on road safety and proposes actions to tackle the global road safety crisis. Considering the current level of road safety to be unacceptable, the UN has taken several initiatives. One effort, the Decade of Action for Road Safety 2011–2020, has generated substantial activity around the world over the last couple of years. Furthermore, it is very encouraging that the UN included road safety in the Sustainable Development Goals that it laid out in September 2015. Road safety is part of the public health agenda and the urban development agenda. Measured in “real actions,” however, the responses so far from the overall global community and individual countries do not suggest that we are already on the right track to bringing down the death toll on roads.The future of road safety is uncertain and definitely not the same for all regions of the world. Countries with a mature road safety approach and an ambition to make further progress are expected to move in the direction of a pro-active approach: a Safe System approach. It is reported that many LMIC, meanwhile, are on the brink of designing road safety strategies and implementing action plans. The international community is willing to support LMIC, but LMIC cannot simply copy successful HIC strategies because local circumstances differ. The principles of successful HIC strategies are applicable, but the priorities and action plans should take root in and align with local conditions.     

面向对象收费系统的数据安全与解决方案

一种利用计算机仿真技术整合多种库类型格式的创新方案，采用虚拟磁带库保护数据安全，保证了面向对象系统的数据存储更高性能与智能化．并已在面向对象技术的不停车收费系统中得到了成功应用。     

嵌入式船舶数据记录仪监测系统设计与实现

以PC/104嵌入式工控机与PC机所组成的局域网为基础,在VC环境下,有效利用CSocket类和SQL数据库,开发基于TCP/IP协议、客户端/服务器模式的专门记录船舶装置长期运行且无人值守环境下的监测系统,完整、准确地记录船舶航行各装置工况。系统具有实时数据采集、远程数据传输、数据监测、数据查询等功能,并在文件传输过程中采用混沌加密算法保证数据信息安全。经过实际调试与运行,该记录仪运行稳定,实时性好,安全性高。     

DEADBEAT COVARIANCE CONTROLLER DESIGN FOR SAMPLED-DATA SYSTEMS

ＭＰＬＥＤ－ＤＡＴＡ ＳＹＳＴＥＭＳTX＠霍沛军＠王子栋ＩｎｔｒｏｄｕｃｔｉｏｎＳａｍｐｌｅｄ－ｄａｔａｆｅｅｄｂａｃｋｃｏｎｔｒｏｌｈａｓｒｅｃｅｉｖｅｄｍｕｃｈａｔｅｎｔｉｏｎｉｎｔｈｅａｒｅａｏｆｃｏｎｔｒｏｌｓｙｓｔｅｍｄｅ－ｓｉｇｎｂｅｃａｕｓｅｏ...     

螺旋桨噪声的Wigner谱研究

就信号处理中的Ｗｉｇｎｅｒ方法及其螺旋桨噪声试验中的应用问题作了初步探讨。简要地介绍了Ｗｉｇｎｅｒ分布的基本概念及其物理意义，结合模型试验和数值计算给出了螺旋桨噪声的时－频联合分布及其在时域和频域中的能量分布。结果表明：Ｗｉｇｎｅｒ谱对于螺旋桨噪声的时域分布、线谱和非定常噪声的测试分析是十分有效的。     

公安信息系统新型内外网数据交换关键技术研究与应用

随着互联网服务平台的推广应用,越来越多的群众更倾向于在互联网服务平台上办理各类公安交通管理业务,这也让公安网服务平台和互联网服务平台的联系越来越紧密,迫切需要一套成熟的内外网交换框架保障相互之间数据流转的可靠性、稳定性以及高效性,而现有的内外网数据交换系统大多是单节点处理,满足不了日益增长的数据交换需求。本文通过采用Kafka、Redis以及Spring Boot等技术搭建新型内外网数据交换系统,以微服务的架构来研发部署,从而提高系统间的交换效率以及吞吐量。     

虚拟仪器技术在传感器实验台中的应用

虚拟仪器技术是微电子、通信、计算机等现代科学技术高速发展的产物.通过对虚拟仪器技术的深入研究,把该技术应用到传感器实验台的硬件驱动、数据采集、结果分析、数据显示、数据输出等,改变了传统的设计方法,实现用计算机技术结合虚拟仪器来实现传感器试验台的功能,使传感器实验台的结构简单合理、灵活方便、一机多用.     

利用虚拟线圈技术对视频交通数据进行采集

针对于传统的地埋线圈检测器检测技术,本文给出了一种基于视频图像的虚拟线圈检测方法,并在实际应用中取得很好的效果。