Delay Restoration of Single-Track Railway Rescheduling

On the basis of analysis of the principle of delay restoration in a disturbed schedule, a heuristic algorithm for rescheduling trains is developed by restoring the total delay of the disturbed schedule. A discrete event topologic model is derived from the original undisturbed train diagram and a back propagation analysis method is used to label the maximum buffer time of each point in the model. In order to analyze the principle of delay restoration, the concept of critical delay is developed from the labeled maximum buffer time. The critical delay is the critical point of successful delay restoration. All the disturbed trains are classified into the strong-delayed trains and the weak-delayed trains by the criterion of the critical delay. Only the latter, in which actual delay is less than its critical delay, can be adjusted to a normal running state during time horizon considered. The heuristic algorithm is used to restore all the disturbed trains according to their critical details. The cores of the algorithm are the iterative repair technique and two repair methods for the two kinds of trains. The algorithm searches iteratively the space of possible conflicts caused by disturbed trains using an earfiest-delay-first heuristics and always attempts to repair the earliest constraint violation. The algorithm adjusts the weak-delayed trains directly back to the normal running state using the buffer time of the original train diagram. For the strong-delayed trains,the algorithm uses an utility function with some weighted attributes to determine the dynamic priority of the trains, and resolves the conflict according to the calculated dynamic priority. In the end, the experimental results show that the algorithm produces ＂good enough＂ schedules effectively and efficiently in disturbed situations.     

你有权选择幽默

新辟一个吧 从前听说一个人快不行了，呜啊呜啊送到急诊室，护士便叫：“快接氧气，快接氧气!” 后来听西藏旅游回来的朋友说，拉萨上等宾馆的房间内，为来客备有氧气袋，因为喜马拉雅山的空气含氧量仅为平原的60％到……     

城市轨道交通线网方案的综合评价

根据城市轨道交通线网规划方案综合评价的特点，建立了综合评价指标体系，并结合以往的实践经验，介绍了FHW综合评价方法以此领域应用的优点及评价过程。     

一见钟情“307”

我头一次买车，目标方向明确。有一天心仪的车“撞”进了我的眼睛，就是它了！[编者按]     

列车优化操纵速度模式曲线生成的智能计算研究

讨论了在起伏坡道线路上运行的列车节能操纵的优化计算问题，给出了一种局部优化与全局优化相配合的计算结构，用以生成列车优化操纵的速度模式曲线。以仿真计算获得局部优化规律，用神经网络实现局部优化规律的数据组织，应用遗传算法进行全局优化计算，获得了令人满意的结果。