石家庄客运段网络办公自动化的实现

在对当前石家庄客运段办公特点和现状进行分析的基础上,采用无盘工作站与图形终端技术,建立高质量、高效率的办公自动化信息系统,实现网络自动化办公,大大提高了工作效率,降低了办公成本。     

Impact Loads due to Wheel Flats and Shells

A Finite Element (FE) model of vehicle-track system is employed to duplicate the experiments carried out by British Rail and CP Rail System. The theoretical results of the wheel/rail contact forces, rail-pad forces and strains in the rail showed very good correlation to the experimental data. Extensive results are compared with experimental data in the time domain for through validation of the developed model. The characteristics of the impact loads due to wheel flats and shells are investigated based on the validated FE model. The study shows that the shape and size of flat or shell, axle load, vehicle speed and rail-pad stiffness mainly affect the impact loads. Adding elastomeric shear pads on the wheelset bearing does not reduce the wheel/rail dynamic contact force but it may reduce the dynamic force on the bearing. Reducing rail-pad stiffness to a certain level on a concrete-tie track may significantly reduce the dynamic load and the force transmitted to the concrete tie.     

基于时间序列法的舰船运动预报实验研究

采用线性自回归AR模型、具有首前波观测量的ARMA模型以及非线性自回归NAR模型三种方法分别对舰船运动进行预报,将得到的预报结果与实验测量结果进行验证比较,并对最佳预报模式进行讨论.     

Trip Chain's Activity Type Recognition Based on Support Vector Machine

This paper focuses on support vector machine (SVM) based trip chain's activity type recognition. First, the time-series location information of person trip is processed to obtain the trip chain elements including moving processes and activities, and the activity options are extracted from the geographic information system (GIS) around the activity sites. Second, the activity features are drawn from spatio-temporal factors of trip chain to serve as the input feature vector of classifier. A SVM based one-to-one classifier is established and the method of one-to-one classifier voting is adopted to decide the most likely activity type from the activity options. Finally, the classifiers are trained with simulation data based on the Gaussian radial basis (RBF) kernel function and the multilayer perception (MLP) kernel function respectively, and then examined by cross validation. The result shows that in the one-to-one classifying scheme, the highest and lowest right recognition rate with RBF are 99% and 62%, and the corresponding results with MLP are 97% and 54%, respectively.     

A game-theoretic analysis of competition among container port hubs: the case of Busan and Shanghai 1

Countries throughout the world, and especially within Asia, are investing heavily in container port infrastructure in the hopes of capturing a larger share of global shipping activity for their economies. Many existing ports are emphasizing developing the capacity to serve as a hub port, building deepwater berths with large terminals to facilitate transfer of containers from feeder ships to mother ships for intercontinental transport. We develop a game-theoretic best response framework for understanding how competitor ports will respond to development at a focus port, and whether the focus port will be able to capture or defend market share by building additional capacity. We apply this model to investment and competition currently occurring between the ports of Busan and Shanghai.     

城市轨道交通民营化的发展模式选择

根据城市轨道交通100多年来的发展历程,总结出6种发展模式,并重点研究了其中3种民营化的发展模式.在此基础上,分析了城市轨道交通民营化发展过程中存在的4个主要问题.结合中国的实践,对如何选择城市轨道交通发展模式提出了建议.     

潜艇大气环境多传感器信息融合技术研究

介绍多传感器信息融合技术的概念,分析了多传感器集成与信息融合的问题,介绍了贝叶斯准则、D-S证据理论、模糊理论和神经网络的4种方法与算法,论述了潜艇大气环境多传感器信息融合技术研究的优点及其必要性.     

基于GIS的铁路绿色选线决策支持系统的研究与设计

为了解决铁路建设带来的环境问题，围绕铁路环境保护“十五”计划中提出的“绿色选线”制度，运用系统分析和多目标决策的理论和方法，以地理信息系统（GIS）为主要技术支撑，以决策支持系统（DSS）为核心理论，并引入基于组件的软件开发方法，从铁路线路方案的环境影响问题出发，结合其特点，对基于环保理念的铁路绿色选线决策支持技术进行了研究，完成了基于GIS的铁路绿色选线决策支持系统的总体设计与实现，完善了现有铁路选线过程中环境问题的考虑方式，提高了决策的能力和智能化水平。     

美国GE转向架构架铸造工艺研究

本文叙述了GE构架产品结构特点和技术要求,分析了铸造工艺上的技术难度,以及为控制铸件尺寸,解决铸件变形和解决铸造裂纹等缺陷问题所采取的多项工艺措施和工艺试验.从而保证了新型三轴整体铸钢构架铸造成功。     

铁路建设项目社会评价初探

铁路是我国国民经济的大动脉，项目投资规模大，涉及范围广，对区域经济和社会发展影响显著，涉及环境保护、征地拆迁、移民安置等问题，有明显的外部性和公益性特征，因此，从客观上要求在项目论证中必须重视各种社会因素的分析评价。阐述了社会评价在我国铁路建设项目中的应用情况，重点分析了铁路利用外资项目实施社会评价的主要经验，并对我国铁路项目开展社会评价工作提出建议。