汽车离合器起步阶段局部模糊控制研究

针对机械式自动变速器(AMT)的关键问题--离合器起步控制,在模糊控制的基础上提出局部模糊控制策略,并建立了局部模糊控制规则.通过计算机仿真、试验分析表明,该控制策略能够反映驾驶员起步意图,使车辆迅速平稳起步,可进一步减少滑磨功;同时可提高模糊控制性能,增强离合器起步控制的实时性.     

Identity-based verifiably committed signature scheme without random oracles

An identity-based verifiably committed signature scheme （IB-VCS） was proposed, which is proved secure in the standard model （i.e., without random oracles）. It enjoys the setup-free property and stand-alone property, both of which make an exchange protocol more practical. The scheme is unconditionally secure against the cheating signer, its security against the cheating verifier is reduced to the computational Diffie-Hellman （CDH） problem in the underlying group, it is secure against the cheating trusted third party if the underlying Paterson Schuldt＇s identity based signature （IBS） scheme is secure, which is proven true based on the CDH assumption in the standard model.     

Entropy-based estimation of transfers in a terminal

An intermodal transportation terminal is a facility that provides commuters with easy transfer between transit modes and providers such as buses, light rail, subway, taxis, airport shuttles, and commuter rail. The probability of a passenger transferring from one mode to another and the estimation of total transfer demand are of great importance to both practitioners and researchers when determining optimal design alternatives as well as the best control and management policies for daily operation of the terminal. This article presents a study that uses an entropy-based optimization approach to estimate the transfer demands between the available transportation modes in an intermodal transportation terminal. The development and calibration of the entropy model is presented in the first part of the article, which is followed by a case study of the SiHui Intermodal Terminal in Beijing, China.     

装配式地铁车站预制构件加工质量检验与安装精度预测

为解决装配式地铁车站工程预制构件常因质量检验工作任务繁重且误差较大而造成质量不合格及无法精准安装的问题，将BIM+三维激光扫描技术应用于装配式地铁车站工程预制构件生产质量检验中，通过建立预制构件BIM模型与三维点云模型进行虚拟预拼装，检验加工精度，避免现场安装过程中因构件质量问题而造成浪费。运用灰色预测方法构建GM（1，1）灰色预测模型，预测装配式地铁车站多个预制构件拼装后的累计误差，并以此对虚拟预拼装检验结果进行对比验证。结果表明： 1）本次质量检验的7块构件加工误差均在规范允许范围内； 2）整环累计拼装误差为13.920 mm，其中，C1块与D块间拼装误差达4.150 mm，其他相邻块纵缝间隙均小于3 mm； 3）虚拟预拼装误差检验结果与GM（1，1）模型灰色预测结果拟合较好，最大偏差仅为0.407 mm。     

Activity-based trip chaining behavior analysis in the network under the parking fee scheme

Transportation - In this paper, we incorporate activity-based trip chaining behavior into the network equilibrium analysis. An integrated model which combines Beckman-type congestion link terms and...     

浅谈鲁南高铁CSD瞬时干扰率优化工作

在鲁南高铁曲阜东至日照段联调联试中.日照西站附近总是出现CSD瞬时干扰问题.为此对网络、设备进行研究,分析A和Abis接口监测数据码流,查看有关参数设置是否匹配.找出问题所在,修改设备参数后解决了问题。     

游艇监管研究

游艇产业在我国属于新兴产业,是我国旅游产业和休闲娱乐运动的重要组成部分,对我国调整产业结构、拉动内需、可持续发展具有重要作用。但现有的法律法规在一定程度上制约了游艇产业的发展。     

15．9万吨原油船3309ps模型制作难点及应对措施

船体分段是由零、部件组装而成的局部结构，其质量将直接影响船舶的建造质量。文章以15．9万吨原油船3309ps制作为例，介绍分段制作的难点及应对措施。     

地铁系统能力和服务水平的若干设计标准探讨

针对我国各城市在地铁运营中出现的实际情况,尤其是北京、上海、广州等地的地铁进入网络化运营后客流急剧增长的现象,结合广州地铁运营的实测数据,以及世界主要城市地铁的设计标准,分析了我国现行的城市轨道交通设计规范和标准中有关系统能力的确定、车站规模的控制、服务水平的划分等内容,并提出了具体的建议。     

不同供电制式对轨道交通线路隧道断面的影响

最高速度在140 km/h左右的快速轨道交通系统,对于牵引供电制式的选择,可采用AC 25 kV交流制式或者DC 1 500 V直流制式.在隧道内,两种供电制式因绝缘距离的不同导致隧道断面大小的不同.通过对隧道采用圆形断面形式、架空刚性接触网悬挂方式时的隧道断面开挖量等进行分析比较,对两种供电制式的隧道土建工程投资差别作出了判断.