智能公交乘客信息服务数据库设计

本文从车载、站台以及控制中心三方面分析了智能公交乘客信息服务系统,重点介绍了站台触摸屏公交查询系统中数据库的设计.查询系统数据库以ACCESS进行描述,创建了公交信息的存储结构,以ADO.NET与数据库进行连接访问,实现了对公交站点线路的查询.以VB.NET编程实现了起始站点名称选择和点击地图两种方式的公交站点查询、线路查询以及具有最少换乘次数的出行路径查询.     

QC方法在怀通高速路线方案优化中的应用

质量改进小组活动被越来越多的企业的实践证明是一种成熟的质量改进方式,成为企业质量管理活动中不可缺少的重要组成部分。目前．在土木工程领域．QC小组活动的应用有益于规避隐患．降低造价．提高质量。将QC方法应用于怀通高速公路江市段路线方案的优选,取得了较好的效果。     

上海市新西干线蕰藻浜调蓄处理池试运行效益初探

该文以国内第一座调蓄处理池——上海新西干线蕰藻浜调蓄处理池为研究对象,初步探讨了试运行期间调蓄处理池对暴雨放江的污染减排功效。研究显示:2012年蕰藻浜调蓄处理池经过试运行后,达到设计和规范要求,具备正式运行条件;蕰藻浜调蓄处理池在2012年"海葵"台风期间发挥了良好的环境效益,单次运行的暴雨放江量削减率达到52.0%;单次运行对暴雨放江COD、SS、NH4+-N和TP的削减量可达3 891 kg、1 767 kg、303 kg和44.0 kg;建议采用重力与泵送相结合的进水与放空模式,以降低调蓄处理池的运行成本。     

北极东北航道沿途关键海区及冰情变化研究

文中分析了东北航道沿途各海域的特点,并通过收集、整理国内外专家对北极东北航道海冰变化规律的研究成果,给出了北极东北航道关键海区及冰情变化趋势。     

日本ITS开发和运用的实例--名古屋基于浮动车信息的P-DRGS简介

简要介绍了日本最近开发的一个先进的车辆导航系统——名古屋基于浮动车信息的动态路径引导系统(P-DRGS)。分别从系统的开发历程和计划,系统的构成、特点以及实用化四个方面介绍了P-DRGS的概况,从而在一定程度上折射出日本ITS发展的历程和值得我国借鉴的经验。     

山钢莱芜分公司专用铁路编组站改造方案研究

专用铁路编组站改造是山东钢铁股份有限公司莱芜分公司新旧动能转换项目的控制工程之一,对于铁路运输组织、站场设施管理工作的提升具有重要意义.在阐述既有莱钢编组站站场设施和运输组织现状的基础上,结合钢铁新旧动能转换工程规划,分析莱钢编组站目前存在的无贯通正线、到发线有效长不足、卸车线有效长不足、站坪坡度超限等问题,提出莱钢编...     

Auction-based tolling systems in a connected and automated vehicles environment: Public opinion and implications for toll revenue and capacity utilization

Autonomous and connected vehicles are expected to enable new tolling mechanisms, such as auction-based tolls, for allocating the limited roadway capacity. This research examines the public perception of futuristic auction-based tolling systems, with a focus on the public acceptance of such systems over current tolling practices on highways (e.g., dynamic and fixed tolling methodologies). Through a stated-preference survey, responses from 159 road-users residing in Virginia are elicited to understand route choice behavior under a descending price auction implemented on a hypothetical two-route network. Analysis of the survey data shows that there is no outright rejection of the presented auction-based tolling among those who are familiar with the current tolling methods. While males strongly support the new method, no clear pattern emerges among other demographic variables such as income and education level, and age. While high income respondents and regular commuters are more likely to pay higher tolls, no statistical significance between different genders, age groups, household sizes, and education levels is found. Based on the modeling results and the hypothetical road network, it is found that descending price tolling method yields higher average toll rates, and generates at least 70% more revenue when travel time saving is 30 min, and improves capacity utilization of the toll road significantly compared to fixed tolls.     

Robust optimization of distance-based tolls in a network considering stochastic day to day dynamics

This paper investigates the nonlinear distance-based congestion pricing in a network considering stochastic day-to-day dynamics. After an implementation/adjustment of a congestion pricing scheme, the network flows in a certain period of days are not on an equilibrium state, thus it is problematic to take the equilibrium-based indexes as the pricing objective. Therefore, the concept of robust optimization is taken for the congestion toll determination problem, which takes into account the network performance of each day. First, a minimax model which minimizes the maximum regret on each day is proposed. Taking as a constraint of the minimax model, a path-based day to day dynamics model under stochastic user equilibrium (SUE) constraints is discussed in this paper. It is difficult to solve this minimax model by exact algorithms because of the implicity of the flow map function. Hence, a two-phase artificial bee colony algorithm is developed to solve the proposed minimax regret model, of which the first phase solves the minimal expected total travel cost for each day and the second phase handles the minimax robust optimization problem. Finally, a numerical example is conducted to validate the proposed models and methods.     

一种基于CBTC的动态接近锁闭区段计算方法

接近锁闭区段是判断进路是否需要延时解锁的重要依据.提出一种通过中心控制单元控制人工紧急进路解锁的方式,并着重介绍了动态接近锁闭区段计算模型,能有效缩短接近锁闭区段的长度,避免不必要的进路解锁延时,从而提高效率,具有一定应用价值.     

Anycast架构下的铁路DNS系统解决方案

近几年铁路信息化的飞速发展,已经成为铁路现代化的一个标志,作为信息化重要组成部分的DNS系统,为所有对内对外的信息系统提供地址解析服务,因此其可靠性、安全性至关重要,利用Anycast架构建设的DNS系统可以有效解决铁路DNS系统存在的性能瓶颈,以及难以抵御网络攻击等问题,可以极大提升铁路信息系统的可靠性、安全性。