铁路工程施工招标综合评估法投标报价分析

铁路工程施工招投标主要采用综合评估法,对投标文件进行综合评审答分,并将得分由高到低排列推荐中标候选人。此文在介绍综合评估法和投标报价评分规则的基础上,为便于对投标报价进行分析,假设各投标人均为"理性经济人",且目标一致,采用以各投标人的报价平均值作为各投标人的报价,求解满分区间不等式,得出报价范围,再计算各投标人综合得分。该方法经实例计算验证,较其他评标方法简便、精确,且通用性强,可为以后施工招标进行投标报价分析提供借鉴。     

工程建设实施阶段材料价差调整计算方法探讨

铁路工程建设项目投资受国家政策和建筑市场物价变化等因素的影响,为有效控制工程项目投资,工程施工阶段需对材料价差进行动态调整。材料价差调整政策性强、工作量大、要求精细。此文在阐述材料价差调整依据及程序的基础上,对甲供材料和施工企业自购材料价差调整的原则及计算方法进行分析与探讨,提出可采用的计算方法。并结合工程实例进行材料价差调整的计算,验证其计算方法的可行性与可用性。     

采用初步设计文件施工招投标的工程概算清理有关问题的思考

采用初步设计文件进行施工招投标的铁路建设项目,目前大部分正处于概算清理阶段。概算清理是针对采用初步设计文件进行施工招投标特别增加的一项投资管理措施,他涉及到施工图投资检算、变更设计、征地拆迁及价差调整、其他政策性费用调整等,政策性强、工作量大。此文针对施工总价承包招标文件范本的有关条款,就概算清理原则、施工图投资检算的编制、价差调整等进行论述与分析,并提出建议与计算方法,为实际工程概算清理提供借鉴。     

高速列车宽带无线上网方案比较及电气安装要求

针对高速列车无法宽带无线上网的问题,分析比较了3种不同的解决方案和各自对电气安装的要求。车外语音加车内无线局域网,直放站配合无线局域网和微蜂窝RRU拉远这3种方案都能提供高速列车宽带无线上网。但是它们技术方案不同,导致成本、性能、布线难度不一样。可以根据工程要求选择不同的改造方案。     

混合动力--未来城市公交的明星动力

本文阐述了目前国内外混合动力总成常用的几种方案,介绍了一种适合康明斯发动机的混合动力方案,展望了该动力总成的开发前景。     

城市公交客车发展趋势

本文从未来十年城市社会经济和文化发展的角度分析了公交客车发展的趋势:即动力设计环保化、形体设计大型化、技术配置多样化、性能选择人本化、信息沟通智能化、外观设计艺术化、操作系统自动化、应急设置可靠化、总成寿命同步缩短化、车身结构轻型化。     

人工智能在车辆自动驾驶中的应用

提出一种新的基于人工智能的感知 计划 动作agent结构实现智能车辆自动驾驶的方案。首先通过描述该结构的原理说明该结构可以解决自动驾驶中存在的一些问题,接着通过建立自动驾驶知识库阐述如何具体实现自动驾驶,最后通过仿真实验验证该方法能够为智能车辆实现自动或辅助驾驶提供一种非常有效的机制。     

浅谈FAS双中心建设及设备维护

重点分析了西安局集团公司由2K数调主系统组网更新改造为FAS双中心网络的建设方法,并根据日常维护经验,列举了调度台通道故障处理、FASB简易故障判断及计表倒换试验、FASA和FASB系统与MSC之间的业务故障处理等.     

Ontologies for transportation research: A survey

Transportation research relies heavily on a variety of data. From sensors to surveys, data supports day-to-day operations as well as long-term planning and decision-making. The challenges that arise due to the volume and variety of data that are found in transportation research can be effectively addressed by ontologies. This opportunity has already been recognized – there are a number of existing transportation ontologies, however the relationship between them is unclear. The goal of this work is to provide an overview of the opportunities for ontologies in transportation research and operation, and to present a survey of existing transportation ontologies to serve two purposes: (1) to provide a resource for the transportation research community to aid in understanding (and potentially selecting between) existing transportation ontologies; and (2) to identify future work for the development of transportation ontologies, by identifying areas that may be lacking.     

An optimization model for integrated planning of railway traffic and network maintenance

Railway transportation systems are important for society and have many challenging and important planning problems. Train services as well as maintenance of a railway network need to be scheduled efficiently, but have mostly been treated as two separate planning problems. Since these activities are mutually exclusive they must be coordinated and should ideally be planned together. In this paper we present a mixed integer programming model for solving an integrated railway traffic and network maintenance problem. The aim is to find a long term tactical plan that optimally schedules train free windows sufficient for a given volume of regular maintenance together with the wanted train traffic. A spatial and temporal aggregation is used for controlling the available network capacity. The properties of the proposed model are analyzed and computational experiments on various synthetic problem instances are reported. Model extensions and possible modifications are discussed as well as future research directions.