Impacts of accident severity factors and loss values of crashes on expressways in Thailand

The number of road accidents and the level of accident severity have been extensively applied as the indicators for measuring the efficiency of service provision in road network systems of each country. This research utilized accident data on expressway networks during B.E.2550 (2007) to B.E.2553 (2010) (updated data was collected), in which Expressway Authority of Thailand (EXAT) as legislatively mandated unit has taken responsibility for the execution of nine expressway routes covering distances totaling over 207 km with a record of 2194 crashes. The chief objective of the study aims to forecast the accident severity through formulating Multiple Logistic Regression Model to analyze the probability of injury accident and fatal accident in comparison with property damage only accident. Its measurement comprehensively considers statistical relationship among variables such as average speed on road section, average traffic volume per day, period of time, weather conditions, physical characteristics of accident area, and causes of accident. Together, the research question is to verify whether these variables affect the opportunity or probability of three levels of accidents and investigate impacts of accident loss values due to the reduction in crash severity measures.     

列车分级控制方式对地铁列车最小间隔之影响分析

本文将结合北京地铁2号线的设计，重点分析采用一次模式制动曲线控制方式和速度分级控制方式对列车最小间隔时分的影响。     

CTCS-2列车运行控制系统问题

简要介绍CTCS-2级列车运行控制系统的若干问题,分析一些常见的故障,针对这些问题提出相应的解决方案和改善措施。主要阐述临时限速问题、ATP车载设备问题以及常见的列控系统地面设备故障,概述常见接口故障。     

船用柴油发电机组及其调速系统的动、静态仿真

根据船用柴油机及其调遣系统运行特性，设计了一套数字—物理混合仿真装置，该装置能较好地模拟船用柴油机及其调速系统动、静态特性，为船舶电站的设计、研制和运行提供了有效的试验手段。     

Empirical Estimation of Term Structure of Interbank Rates in China

Nelson-Siegel model （ NS model） and 2 extended NS models were compared by using daily interbank government bond data Based on the grouping of bonds according to the residual term to maturity, the empirical research proceeded with in-sample and outof-sample tests. The results show that the 3 models are almost equivalent in estimating interbank term structure of interest rates. Within the term to maturities between 0 and 7 years, the gap of the absolute errors of the 3 models between in-sample and out-of-sample is smRller than 0.2 Yuan, and the absolute values of the in-sample and out-of-sample errors are smaller than 0. 1 Yuan, so the estimation is credible. Within the term to maturities between 7 and 20 years, the gap of the absolute errors of the 3 models between in-sample and out-of-sample is larger than 0.4 Yuan, and the absolute values of the in-sample and out-of-sample errors are larger than 1.0 Yuan, so the estimation is incredible.     

槽道水翼滑行艇快速性能研究

本文论述槽道水翼滑行艇的基本原理、快速性能及其及化规律。通过模型试验、中间艇试验和实部的航行试验，证实了槽道水翼以及与尾压板的联合作用，使槽道型滑行般的阻力减小，航行姿态得到调整和改善，艇的超载能力等综合航海性能有明显的提高。模型试验结果表明槽道水翼使艇体总阻力平均减小25％左右；中间试验艇的航速提高了8％；实船试航航速提高了18％；负荷超载能力增加15％。通过对试验结果的分析，给出对设计有参考意义的结论。     

基于中心差分卡尔曼滤波的车速估计研究

针对车辆行驶过程中车速估计问题,论文基于中心差分卡尔曼滤波理论设计了车速的估计算法。建立了非线性三自由度车辆估算模型,根据纵向加速度、侧向加速度和方向盘转角低成本传感器信号的信息融合,实现对车速的准确估计,应用CarSim与Matl ab/Simulink联合仿真实验对算法进行验证。结果表明:估计算法能够准确估计车辆行驶过程中的纵向车速、侧向车速和质心侧偏角。     

基于条件匹配的ATP区段速度码计算方法

本文提出了基于条件匹配的ATP区段速度码计算方法。该算法以大连金开线“开发区站”、“东山路站”和“九里站”为区域控制中心的控制范围进行了模拟试验，其结果与设计单位提供的码序表相吻合。该算法基本消除了因各站场的特殊性造成的影响，有成为各站场ATP速度码计算通用算法的可能。     

驼峰可控顶自动调速系统控制技术研究与应用

根据可控减速顶的调速原理，介绍驼峰可控顶自动调速控制系统的控制技术。通过设计相关的软件和硬件，对溜放车组进行精细位置跟踪，实现变速控制。应用效果表明，此系统具有控制精确、可靠性和安全性高等特点，满足运输生产要求，适用于我国中小驼峰现代化改造。     

快速发展的中国高速铁路

中国高速铁路网将由时速≮250 km 铁路客运专线网和时速≮200 km 铁路提速线路组成。借鉴国外高速铁路代表作的技术格局,结合中国国情、路情,中国高速铁路的自主技术体系初步形成,站前技术已经取得全面突破,站后技术创新工作已经进入重点突破阶段。透视时速300～350 km 客运专线,中国高速铁路关键技术主要包括运输组织、工务基础设施、牵引供电系统、通信、信号、信息化及动车组等方面内容,要着力解决好无碴轨道、轮轨关系、列车运行控制系统、轨下基础工后沉降控制等重大技术,有效利用资源,创新技术管理手段,采取强有力的技术保障措施,取得中国高速铁路关键技术的全面突破。