社会化企业物流信息系统结构研究

物流信息系统及其平台的建设是现代物流理论研究的重点,对于提升现代物流活动的服务水平及效益、效率具有积极的促进作用.文章分析了我国企业的物流信息化基本特征与存在的主要问题,对现有信息平台建设模式进行了总结,提出了建立社会化企业物流信息系统的解决对策.通过对社会化企业物流信息系统的基本概念及内涵的分析,结合政府管理部门及企业对社会化物流信息系统的功能需求分析,对其功能结构以及总体结构等进行了设计.     

城乡一体化中发展轨道交通的几点思考

在城乡一体化发展进程中,轨道交通必将以其大容量、快速交通的优势,成为城乡一体化交通体系的骨干,满足新的交通需求.结合30多年来香港新市镇发展中城乡轨道交通发展的实例,从轨道交通在城乡一体化发展中的功能角色、既有铁路在城乡一体化轨道交通中的利用、如何建设节约型的城乡轨道交通以及城乡轨道交通与沿线协调发展四方面,对城乡一体化中轨道交通的发展提出一些建议和思考.     

Mixed RP/SP models incorporating interaction effects

In order to analyse the impact of a new train service in Cagliari (Italy) a databank including information from a revealed preference (RP) and a stated preference (SP) survey was set up. The RP data concern choice between car, bus and train; the SP data consider the binary choice between a new train service (quicker, more frequent, with a lower fare and more stations than the current one) and the alternative currently chosen by car and bus users. Logit models allowing for correlation among RP alternatives were estimated for this mixed RP/SP data set using the artificial tree structure method. The analysis included level-of-service variables measured with an unusually high level of precision, latent or second order variables (such as comfort), inertia and interaction variables. Different specifications of the utility function were tested, including the expenditure rate model, and the effects of these specifications on modelling results are highlighted. Our results show that for a population mainly composed of fixed income workers, the expenditure rate model is superior to the traditional wage rate model, yielding lower and more significant subjective values of time. Moreover, we found that the non-linear specifications appear to be more suitable as not only better model results were obtained, but also the real distribution of the error terms was revealed (i.e. highlighting correlation among public transport options).     

城市轨道交通AFC系统总体业务规划

指出自动售检票( AFC)系统是现代城市轨道交通运营的基础和必要条件,其运作好坏直接影响到整个轨道交通系统的社会效益和经济效益.分析网络化运营条件下轨道交通AFC系统的功能,并对其业务进行分类,进而规划其职能部署,为城市轨道交通AFC系统运营提供指导和参考.     

基于通信的列车控制系统应用解析

以首条国产信号系统示范线北京亦庄线为载体,介绍了国产基于通信的列车控制系统的整个结构,详细分析了列车自动防护ATP、列车自动运行ATO的主要功能及相关信号专业接口,重点探讨了各个系统的详细工作过程以及整个系统特殊功能。     

自由曲面构造及其在CAM中的应用

本文讨论用有理函数参数方程理论实现三维空间自由曲面构造的方法，并粗略描述了运用该方法实现计算机辅助制造的算法。     

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为缓解日益严重的交通拥堵及其带来的环境问题,中国很多城市开始发展轨道交通系统.但是轨道交通能否达到预期的分担率还取决于其相对于路面交通方式是否具有明显的优势.有效的运行管理系统不仅有利于轨道交通的建设与发展,也有利于提升整个城市交通系统的运行效率.针对拥挤线路,在一定的管理目标约束下,本文建立了票价、发车频率和车厢数的优化模型.模型还考虑了负外部性的噪声污染因素、车内拥挤度的反作用以及正外部性的缓解道路拥挤因素.选取苏州市为例,详细说明了某运输通道下轨道交通线路定价的有效性和服务供应的合理性的评价方法.理论与实例综合分析表明,与经济效益最大化相比,社会效益最大化的需求为低票价、多车厢数和高载客率.从现行的运行管理模式向社会效益最优转化需要降低票价、增大发车频次并增加车厢数.     

起亚OPTIMA自动灯光控制系统技术剖析

本文针对东风悦达·起亚新远舰轿车的自动灯光控制系统进行剖析,依此叙述了该系统的参数、输入输出图、各端子功能、自动灯光工作及工作条件、自动灯光电路图、工作电路说明。     

Wave spectrum estimation conditioned on machine learning-based output using the wave buoy analogy

In this work, a hybrid approach for wave spectrum estimation is proposed. Fundamentally, the approach is based on the wave buoy analogy, processing ship response measurements, via a framework combining machine learning and a physics-based method dependent on available transfer functions. Specifically, a non-parametric (Bayesian) estimate is obtained of the directional wave spectrum conditioned on integral wave parameters established by a convolutional neural network. The developed method is assessed in a case study considering about two years of data obtained from an in-service container ship. The method produces good results, significantly improved when compared to the initial estimate made without constraints.