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| 1 | Campus Bus Network Design and Evaluation Based on the Route Property显示文摘A campus bus network design and evaluation,taking Tsinghua University as an example,is investigated in this paper.To minimize the total cost for both passengers and operator,the campus bus system planning in a sequential approach is discussed,including the route network design,headway(i.e.,the inverse of service frequency) optimization,and system evaluation.The improved genetic algorithm is proposed to optimize the route network based on the route property,and the impacts of the fluctuation of passenger demand and average traveling time are analyzed.The identity proportion in the headway optimization is then introduced with full consideration of its impacts.Based on the actual variety of passenger demand,a non-fixed schedule demonstrates its efficiency.VISSIM is finally adopted to simulate the campus bus system and a comprehensive evaluation system for the campus bus is developed.Compared with the current bus network and the one without considering the route property,the evaluation of the proposed approach shows an improvement of 18.7% and 10.1%,respectively.Moreover,the sequential approach shows an efficiency improvement over the alternative method.It is of great significance for the development of public transit systems in large industrial parks to decrease the total cost for both passengers and operator. | Jishiyu Ding Shuo Feng Li Li Yi Zhang | 2017 | Tsinghua Science and Technology2017，22，5： | 1 |
| 2 | 基于极大代数的MVB网络过程数据通信建模与分析显示文摘采用离散事件动态系统中常用的极大代数方法考虑多功能车辆总线(MVB)网络过程数据的动态行为.先基于过程数据在MVB上通信的过程构建一个数学模型,再通过数学计算和仿真实验分析和验证在引入周期输入控制的条件下,MVB网络过程数据通信的无阻塞条件,解决了过程数据在通信中可能出现的阻塞问题.实验结果表明,过程数据传输系统是否阻塞由过程数据时间矩阵值及总线管理器在通信存储器上读取主帧的时间间隔决定,后者的值大于等于前者的最大值,且整个网络会进入周期为1的周期稳态,有效提高了多功能车辆总线网络过程数据通信的可靠性. | 胡黄水 常玉琪 王宏志 王博 | 2018 | 吉林大学学报(理学版)2018，56，5： | 1 |
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