车联网-智能手机互联

文中主要阐述车联网之智能手机互联相关功能及架构,结合市场使用情况阐述国内智能手机互联的发展状况。     

基于接收信号信噪比预测的自适应跳频信道质量评估

针对自适应跳频通信的特点,提出基于接收信号信噪比预测算法的信道质量评估方法.在FFH/BFSK系统中采用卡尔曼滤波器、信号子空间法和误码率性能分析法进行仿真.结果表明,在0～25dB的信噪比变化范围内,估计和预测误差较小,能够对信道质量做出实时评估,可用于快速自适应跳频通信系统.     

地铁车辆检修质量的基础管理问题及改进措施

介绍了地铁车辆检修作业基础管理工作,结合车辆检修过程抽查和修竣抽查的结果,对出现的问题提出了改进措施。在地铁车辆检修作业基础管理工作中,加强对车辆质量安全关键点的检查,不仅能提升检修质量,还能提高生产效率,消除安全隐患,保障地铁运营安全。     

增建二线隧道施工控制爆破技术

在武康二线新下坪1号隧道施工中,针对新建隧道与既有隧道近距离毗邻的施工条件,采取了严密的控制爆破施工技术,并及时实施初期支护。通过主要爆破参数、施工技术措施及施工效果的评价,对既有线改造及新建二线工程中毗邻既有隧道的新建隧道施工有一定的借鉴意义。     

造成地铁车辆故障救援事件的原因分析及应对措施

通过对广州地铁线网历年车辆故障救援事件的原因进行分析，指出了需重点关注的车辆系统和部件。为避免囚车辆故障发生救援事件，不仅要根据现场的实际管理情况，还应在车辆采购、设计、制造和验收阶段，以及投入运营后的使用阶段，采取相应的措施。     

上海地铁综合无线分布系统的研究

从技术角度对地铁内综合无线分布系统进行多信号频率研究及干扰分析,通过对系统核心器件综合合路平台、高功率线性功放的研究,实现系统最佳覆盖效果,并通过地铁1、2号线GSM、CDMA覆盖工程实例得以验证。     

翻车机系统PLC584改造可行性方案分析

我港翻车机（简称C／D）系统的核心控制单元是MODICON公司的PLC584。经多年运转,其故障率高,工作稳定性、可靠性差,且技术已过时,需进行改造。MODICON公司生产的MODICON TSX QUANTUM是全系列兼容的工控PLC产品,其性能优越,功能强大,用它来升级改造C／D控制系统是解决现有诸多问题、扩展并优化系统性能的良好途径。     

Semirigid analysis of extended end plate connections based on correlation and sensitivity

Traditionally, semi-rigid analysis of extended end plate connections is assumed to be deterministic parameters. Most of the moment-rotation models of the joint are determined by curve-fitting and statistically regressed with the test data. Parameters of these models have little physical meaning, and the effect of correlations in the parameters is neglected. This paper deals with a semi-rigid joint of extended end plate connections based on correlation and sensitivity analysis. A numerical study was carried out and the finite element analysis was validated compared with the experimental results. The relative moment-rotation model was concluded based on correlations in parameters and probabilistic sentivity analysis. The relationship between height and width of steel beam was partial correlation. The relationship between thickness of steel beam flange and thickness of steel beam web was also partial correlation. Height and width of steel beam, and distance of upper bolts to axle wire of steel beam section were important sensitive parameters for the extended end plate connections.     

Improved scheme of internet congestion control under moving average filter

An important task of Internet congestion control is inhibiting sporadic data flow to maintain a suitable window size or route queue length. Such a requirement is just consistent with the basic idea and function of a moving average filter. In this paper one prior Internet congestion control model, named transmission control protocol (TCP)/random early detection (RED) stroboscopic model, is studied, and then one new scheme is proposed to enlarge its stable domain, where a simple moving average filter is introduced to inhibit sporadic data flow as possible. In the novel scheme the bifurcation phenomenon is postponed without any extra controller. The effectiveness of the new scheme is verified by theoretical analyses and numerical simulations.     

公路投资项目决策物元模型研究

以可拓学的物元模型和可拓集合、关联函数理论为基础,对公路投资决策进行研究.建立了公路投资项目决策物元模型.在现有相关研究的基础上,提出了公路投资项目决策的评价指标体系,并给出了各指标值范同、等级划分和权重确定方法.进行了实例分析,研究结果表明:该模型没计合理,符合实际,能较完整地反映公路投资项目的综合水平.