提高云支线运输效率的对策

大同车务段云支线各装车站是大秦线的主要装车基地,通过对云支线运输效率影响因素的分析,针对存在的通过能力不足、机车运用效率不高、装车设备不配套、列车到达不均衡等问题,提出修建云岗—云岗西双线铁路,提高机车运用效率,改变装车作业方式和合理安排机车运用等对策,满足云支线运量增长的需要,确保大秦线完成运输任务。     

关于南京市街巷路整治的反思

本文阐述南京市街巷支路整治中存在的问题及其对策     

Scheduled paratransit transport systems

In this paper we focus on ways to provide individualized services to people with mobility challenges using existing modes of public transport. We study the design of an interesting case, in which a bus operating in a public transport route may diverge from its nominal path to pick-up passengers with limited mobility and drop them off at their destination. We have modeled the design problem by a mixed integer-linear program, and we developed an exact Branch and Price approach to solve it to optimality. The proposed approach includes a labeling algorithm in which we introduced appropriate dominance rules, which do not compromise optimality. We have compared the efficiency of our approach with that of related algorithms from the literature. Furthermore, we have used the proposed approach to study key aspects of the system design problem, such as the effect of various constraints on the service level, and the tuning of the system’s parameters to address different transport environments.     

构建地铁运营企业应急预案体系

在对近年来国内外地铁发生的突发事件因素分析的基础上,以南京地铁运营分公司为例,提出对地铁运营企业构建突发事件应急预案体系的一种设计方案,包括应急预案体系的分类、分级,以及应急演练管理和应急救援队伍建设等内容。     

顺德支流特大桥深埋式承台钢板桩围堰设计与施工

顺德支流特大桥为102m+160m+90m预应力混凝土连续刚构桥。由于通航和水利的要求,顺?支流特大桥主墩承台埋入河床较深,采用钢板桩围堰施工时基坑开挖深度最深达18m。对该钢板桩围堰的设计计算要点及施工过程进行了介绍。     

The split-demand one-commodity pickup-and-delivery travelling salesman problem

This paper introduces a new vehicle routing problem transferring one commodity between customers with a capacitated vehicle that can visit a customer more than once, although a maximum number of visits must be respected. It generalizes the capacitated vehicle routing problem with split demands and some other variants recently addressed in the literature. We model the problem with a single commodity flow formulation and design a branch-and-cut approach to solve it. We make use of Benders Decomposition to project out the flow variables from the formulation. Inequalities to strengthen the linear programming relaxation are also presented and separated within the approach. Extensive computational results illustrate the performance of the approach on benchmark instances from the literature.     

围绕中心发挥好支部书记的保证和助手作用

党政分设是新形势下加强和改进党的建设、坚持两手抓两手都要硬的重要举措。本文从四个方面阐述了党支部书记如何做好政治保证、助手和引导作用,与行政领导一起形成强大的合力,共同促进单位各项事业的发展。     

基于替代图的列车运行调整计划编制及优化方法

借助对列车优先级、节点、替代弧和替代对等参数的定义,以列车追踪运行间隔时间、列车连发间隔时间和列车间越行地点等为约束条件,以替代图中最长路径最短为优化目标,建立基于替代图的列车运行调整计划编制及优化模型.采用本地搜索算法对模型求解,经过原始计划生成和初级优化,得到有瑕疵(冲突)的但资源利用率较高的初始调整计划.当初始调整计划未满足需求或计划在实施过程中受到扰动需要修正时,采用分层多级优化分枝定界算法,对初始调整计划对应的替代图进行进一步的优化,得到优化的列车运行调整计划.由于替代图与列车运行调整计划的对应关系,用这2种算法对替代图分阶段求解和优化,可以得到满足不同需求的调整计划.通过对模拟环境的仿真,验证了模型和优化方法的完整性和可行性.     

基于列生成算法的动车组检修计划优化

基于动车组运用维修规程的特点,研究动车组检修计划的优化问题。构建动车组交路段和动车组检修基地相互关系的接续网络,刻画动车组担当交路段、进行检修、等待检修3种状态。进一步考虑交路段覆盖约束、检修弧能力约束和路径数量约束,以动车组可行运用计划为决策变量,以待检动车组检修前的累计运行里程最大化为目标函数,建立动车组检修计划优化模型。针对优化模型的决策变量数远远大于约束条件数量的特点,设计将列生成算法嵌入分枝定界算法的分枝定价求解算法。以广深线14列动车组的交路计划为例,采用给出的模型和算法进行动车组检修计划优化。结果表明:优化的动车组检修计划提高了动车组运用效率;只有当检修能力和备用车数量匹配时,才会使动车组得到充分的利用。     

瓯江南口封堵方案研究

使用二维波浪潮流泥沙数学模型研究手段,通过工程实施前后的波浪场、二维潮流场、泥沙场、地形冲淤变化场的数值模拟和分析,对复杂的瓯江河口南口封堵工程的各种方案进行了研究,从对周围水沙环境影响角度论证了南口封堵工程方案的可行性。研究结果表明,将现潜堤加高的南口完全封堵方案是基本可行的,南口半堵方案是完全可行的。建议瓯江南口从半堵起步,逐步完成南口的完全封堵。