江津四面山风景旅游区红岩山危岩初步研究

对江津四面山红岩山危岩进行稳定性验算,计算结果表明红岩山危岩存在进一步发生崩塌的可能性.危岩治理十分必要.对此,提出了该地区危岩灾害防治措施,建议综合采用主被动联合方法进行危岩防治工作.用运动学方法进行落石冲击力检算、腾越计算及弹跳计算,以此结果再结合观测落石的运动轨迹和弹跳高度,以确定拦截防治工程结构物的设计尺寸和材料强度参数.     

城市轨道交通事故故障应急处置相关问题研究

研究了城市轨道交通事故故障应急处置的机制及基本原则。应急反应机制和应急处理机制是应急处置机制的重要组成部分。在应急反应机制中,提出建立由高技术支持的轨道交通应急处置信息管理和发布系统,做好信息的采集、处理和发布,实现事故故障预警;在应急处理机制中,构建完整规范的事故故障预案体系,实现预案的及时更新、有效管理、方便学习和考核以及预案效果的评价和仿真。     

多资源约束下船闸施工网络计划的仿真与优化

船闸施工量庞大、涉及资源多、各工序交错复杂,仅凭人脑经验很难站在全局的角度制定科学、精确的施工计划。在多资源约束下,对船闸施工网络计划仿真建模和资源均衡优化方法进行研究。在分析典型船闸施工流程设计和施工空间划分的基础上,建立典型船闸工程施工网络计划仿真模型和多资源约束下船闸施工网络计划"工期固定-资源均衡优化"的数学模型,设计相应的遗传算法,并通过实际工程进行验证。结果表明,此模型和算法可行、有效,解决了多资源限制下的船闸施工网络计划资源均衡优化问题,为船闸施工进度、资源以及成本管理提供科学有力的依据。     

泸州市长江六桥连接线路线方案比选及相交节点研究

泸州市地处长江和沱江交汇处,各跨江组团间必须依靠跨江大桥进行交通联系,跨江桥梁连接线在泸州城市交通体系中起着举足轻重的作用。结合路网规划、现状控制因素、交通组织对长江六桥连接线路线方案进行了比选;并重点对相关重要交通节点进行了研究,提出了符合泸州城市发展宏观战略要求的交通节点方案。     

A fuzzy logic-genetic algorithm approach to modelling public transport users’ risk-taking behaviour

This paper seeks to determine the effects of uncertainty in out-of-vehicle times on route choice. Data were collected at two key interchanges in Auckland, New Zealand. Previous work modelled the data using a manual approach to fuzzy logic. This study extends that work by automating the process through defining a black-box function to match the survey data, then employing a genetic algorithm to fine-tune the fuzzy logic model. Results show that automation and the genetic algorithm improve the model’s capability to more accurately predict ridership. The tuning of the membership functions is conducted twice, first using initial fuzzy rules and again after the fuzzy rules have been adjusted to reduce disparity between the output and survey data. The calibrated membership functions provided for operational (transfer waiting and walking time and delay) and physical attributes (safety and seat availability) can be used by practitioners to determine an estimated ridership.     

无人帆船长途路径规划研究

将多维动态规划法应用于1条无人帆船从上海到青岛的长途路径规划,在当前位置以外引入已航行路径长度作为第三维状态变量,以相邻路径点之间的短途路径规划方案作为决策变量,可以规划出一组随路径总长度变化的航行时间最短路径。结果显示,增加状态变量维度后,规划结果保留了更多备选方案,起到了很好的决策辅助作用。     

Modeling the interaction between buses,passengers and cars on a bus route using a multi-agent system

This paper models part of a public transport network (PTN), specifically, a bus route, as a small-size multi-agent system (MAS). The proposed approach is applied to a case study considering a ‘real world’ bus line within the PTN in Auckland, New Zealand. The MAS-based analysis uses modeling and simulation to examine the characteristics of the observed system – autonomous agents interacting with one another – under different scenarios, considering bus capacity and frequency of service for existing and projected public transport (PT) demand. A simulation model of a bus route is developed, calibrated and validated. Several results are attained, such as when the PT passenger load is not close to bus capacity, this load has no effect on average passenger waiting time at bus stops. The model proposed can be useful to practitioners as a tool to model the interaction between buses and other agents.     

宜昌东城大道线位及叶家冲立交方案研究

结合地形条件及交通分析,对宜昌市东城大道南延线进行了路线方案比选。根据东城大道南延线和港窑路节点的交通量预测、地形地貌,提出了不同的立交节点方案,从功能、安全和造价等方面进行比选,最终确定节点方案。最后,总结了山区城市道路选线和立交选型的要点。     

考虑溢流费用的路径选择模型的条件研究

通过考虑路段的溢流费用,即路段交通负荷超过该路段交通负荷标准时所分配给用户的费用。路段交通负荷低于路段负荷标准时补贴给用户。建立一些约束条件,动态用户最优的路径选择条件和动态用户最优的溢流费用条件等。为进一步建立具有溢流费用的动态交通网络流的路径选择变分不等式模型及其算法研究打下基础。     

进站信号机显示及区间三接近编码电路的分析与改进

根据现行铁路规范及技术标准分析京沪线党家庄站既有进站信号机显示及区间三接近编码存在的问题,提出相应的电路修改方案,并通过具体实施取得良好效果,达到列车安全运行的目的.