桥梁预警系统异构数据库分布式引擎模块设计

针对桥梁预警系统群体间协同工作对信息共享的需求,从群体协同工作与面向应用的集成角度对桥梁预警系统异构数据库的集成方式进行了研究。提出了包含用户界面、异构集成模块和存储层三部分的桥梁预警系统异构数据库集成模式。该异构数据库集成模型由桥梁结构表征方法,命令解析模块和数据综合模块组成。在异构数据集成的基础上,实现了预警系统群体间的信息共享,为群体协同工作提供了技术支撑。最后通过模拟管理群体向预警系统提出获取桥梁抗震评估请求对异构集成模块的可实现性进行了验证。     

车流表数据库系统的设计与实现

对车流表数据库系统进行总体方案设计,根据实际需要开发系统功能软件,有利于实现铁路车流分析的现代化.应用该软件预测并生成六盘水南站与宣威站近期2020年的结点车流表.     

光缆在线监测系统中数据库备份与恢复的设计

针对采用Oracle数据库的光缆在线监测系统数据备份与恢复,提出一整套完整策略,用于保证光缆在线监测系统的数据安全,当系统崩溃时能够进行快速有效的恢复,将损失降低到最小.     

上海地铁车辆安全检测系统

简述了上海地铁车辆安全检测系统的功能特点及性能指标，并分别对地面检测系统和中央数据库管理系统两部分的原理进行了阐述。该系统已在上海地铁1号线完成了技术验收，各项技术指标均达到要求。     

浸胶机微机集中监测系统研究

介绍了帘子布浸胶机微机集中监测系统的硬件配置及其功能,着重介绍了系统所采用的关系数据库,最后详述如何解决CRT动态显示时的画面干扰问题以及系统中所采用的抗干扰措施。     

Breaking wave at the bow of a fast displacement ship model

We investigated the flow structures under the bow wave generated by a fast displacement ship model (INSEAN model 2340) in the presence of wave breaking. The data acquired were also used for a detailed database for CFD validation. The mean and r.m.s. point-wise values of the wave height were measured by means of a finger probe. The intensity of the breaking wave was taken as the r.m.s value of the wave height. The mean velocity field under the free surface was measured at 0.15 L _PP and 0.2 L _PP downstream of the fore perpendicular by means of a 5-hole Pitot probe. Uncertainty assessment of the wave height and velocity field results was performed following the AIAA Standards S-071-1995. Preliminary CFD results from a RANSE code with a breaking model are shown in comparison with the measured data.     

在VB中利用OO40实现Oracle空间数据库访问

介绍Oracle spatial的基本概念，阐明在VB中使用OO40访问Oracle空间数据库的方法和过程，给出设计实例。     

数据网微机管理数据库的建立与统计处理

本文简要介绍了数据网管理数据库的建立、数据统计方法及实现的具体功能。文中将数据网的描绘分解为多个链结，建立关系型数据库记录每个链结，由此实现对网络描述，并进一步生成网络图和资源分配图。     

基于Web的道路交通规划项目信息管理系统

结合科研和教学实际,根据现有项目分散管理的特点、项目数据的格式以及办公系统的现状和管理的要求,基于动态服务器页面ASP(active server pages)和结构化查询语言SQL(structured query language)网络技术,采用三层网络结构模型,开发、实现了支持多用户、多进程的道路交通规划项目信息管理平台.     

Validating the Passenger Traffic Model for Copenhagen

The paper presents a comprehensive validation procedure for the passenger traffic model for Copenhagen based on external data from the Danish national travel survey and traffic counts. The model was validated for the years 2000–2004, with 2004 being of particular interest because the Copenhagen Metro became operational in autumn 2002. We observed that forecasts from the demand sub-models agree well with the data from the 2000 national travel survey, with the mode choice forecasts in particular being a good match with the observed modal split. The results of the 2000 car assignment model matched the observed traffic better than those of the transit assignment model. With respect to the metro forecasts, the model over-predicts metro passenger flows by 10–50%. The wide range of findings from the project resulted in two actions. First, a project was started in January 2005 to upgrade the model’s base trip matrices. Second, a dialog between researchers and the Ministry of Transport has been initiated to discuss the need to upgrade the Copenhagen model, e.g. a switching to an activity-based paradigm and improving assignment procedures.