我国二手车市场经营管理模式的探讨

针对二手车市场的特点,结合目前我国二手车流通领域中存在的主要问题,提出了规范我国二手车市场经营管理的具体建议。     

Mitigating supply and price volatilities in Singapore’s vehicle quota system

Traffic congestion in city-state Singapore is managed by vehicle ownership restraint complemented with usage charges in bottleneck zones. A certificate of entitlement (COE) obtained from auctions held twice a month is required to register any new vehicle. As Singapore sticks to a target vehicle population, the quota of COEs availed in the auctions hinges critically on the number of vehicles deregistered before the 10 years expiry of the COE. The paper demonstrates that vehicle deregistrations are negatively influenced by the prevailing COE prices. This engenders boom and bust cycles in the COE quotas and thereby spurs price volatility. It is also shown that below an empirically-derived breakpoint quota, COE prices surge and they may also correlate negatively with bidding competition. To avoid such undesirable situations, a proposal is made to allocate the breakpoint quota as a minimum by borrowing from future quotas. This will help smooth quota and price volatilities while adhering to medium-term vehicle population targets. The practicality of the proposal is discussed against various alternatives.     

应急交通运输装备的现状与发展趋势

世界范围内突发事件频频,作为国家战略力量重要组成部分的应急交通运输,其作用日益突显。围绕国内外应急交通运输装备研究与开发现状,从铁路、公路、水路和航空四个方面进行了介绍,提出了国内相关技术与装备的发展趋势,为应急交通运输装备的发展提供借鉴。     

An empirical study to determine freight travel time at a major port

Abstract

This paper examines the reliability measures of freight travel time on urban arterials that provide access to an international seaport. The findings indicate that the reliability index calculated by the median of travel time, which is less sensitive to extreme values in a highly skewed distribution, is more appropriate. This paper also examines several statistical distributions of travel time to determine the best fit to the data of freight trips. The results of goodness-of-fit tests indicate that the log-logistic is the best statistical function for freight travel time during the midday off-peak period. However, the lognormal distribution represents a better fit to arterials with heavily congested traffic during peak periods. Additionally, travel time prediction models identify the relationships between travel time, speeds and other factors that affect travel time reliability. The analysis suggests that incident-induced delays and speed fluctuations primarily contributed to the unreliability of freight movement on the urban arterials.     

努力做好"三个服务"推进交通事业又好又快发展

2007年全国交通工作会议是在深入贯彻落实科学发展观、积极推进社会主义和谐社会建设的新形势下召开的。这次会议的主要任务是:贯彻落实党的十六届六中全会和中央经济工作会议精神,总结2006年交通工作,分析交通发展面临的形势,部署安排2007年工作,做好“三个服务”,推进交通事业又好又快发展,以优异的成绩迎接党的十七大胜利召开。     

新型公交车发动机温度过高问题浅析

近几年来北京公交车辆技术发生了很大的变化:低底盘后置发动机车型;发动机普遍采用了进气增压中冷技术;自动变速箱和缓速器广泛采用;装备了空调系统等等.……     

一种用于船舶监控的卫星通信网络协议

介绍一种基于GPS和北斗／世广卫星的网络通信协议，并用此进行内河船舶实时动态监控。此方法通信能力强、覆盖区域广泛，数据接收迅速、精确度高。最后给出了应用实例，在应用中取得了良好的经济效益和社会效益。     

会计电算化环境下企业内控的分析与研究

随着财务电算化工作的普及深入,会计信息系统的内部控制问题越来越受到人们的重视,本文针对会计信息系统存在的风险,研究了进行内部控制的必要性,重点对电算化会计信息系统实施内部控制提出相应的方法与对策。     

从ProCD公司诉博登泽格一案探讨拆封授权合同的效力及规制

计算机软件业的迅猛发展导致拆封授权合同在全球范围内普遍使用,各国法院对于拆封授权合同的效力问题经历了一个从不认可到认可的态度转变。ProCD公司诉博登泽格一案正是法院承认拆封授权合同效力的重大转折点。本文即以这一典型案例为切入点,分析拆封授权合同的效力及其规制问题。     

用OpenFlight API开发分形地形

分形是近年来流行的地形生成方法。用分形方法生成的地形具有速度快，逼真度高等特点。OpenFlight是视景仿真的标准三维模型格式，已经被大多数视景仿真软件接受。论述了如何用OpenFlight API和分形算法生成三维地形模型。