Veterans' Gathering for Choosing Milestone-makers in the 60 Years' DEVELOPMENT OF SHIPPING INDUSTRY

The two-day Symposium on the Milestone-Makers in China's 60 Years of Shipping Industry was convened as planned in the beautiful ancient town of ZhuJiajiao in Shanghai.Over 30 authorities attended the symposium including the former Minister of Communications and current Chairman of China Communications and Transportation Association(CCTA)Mr.     

构建高效的军事运输系统

从军事物流角度出发,对构建高效的军事运输系统进行研究.分析了现有运输系统存在的问题,针对运输管理体制、运输筹划方法、交通运输网、运输管理信息系统、运输人才培养、运输法规建设等方面提出了一些新的见解和解决问题的思路.     

Modelling the transportation of primary aggregates in England and Wales: Exploring initiatives to reduce CO2 emissions

Millions of tonnes of aggregates are transported across England and Wales each year, which causes constant concerns in regard to CO₂ emissions. Much of that concern arises out of the long journeys from quarries to construction sites, and the fact that the main mode of transfer is by road. The aim of this paper is to describe the construction of a spatial decision support system (SDSS) to examine the impacts of scenarios to reduce the level of CO₂ emissions. The SDSS is made up of a GIS containing a set of spatial models (including a spatial interaction model and a microsimulation model) underpinned by a detailed transport network of road and rail routes across England and Wales. The spatial interaction models are first calibrated to reproduce the existing set of flows of aggregates between quarries and local authority districts. The distance decay component is the travel distance equivalent across the road and rail networks. Based on these flows, linear models can be set up to estimate the amount of CO₂ emissions associated with the existing set of flows. Then a series of what-if scenarios are set up which look at how changes in any part of the geography of production, the level of demand in certain areas or the transport process will impact the CO₂ emissions. The paper demonstrates the capability of the SDSS in responding to the various spatial policies applied in different stages of the supply chain of the aggregates markets.     

Regional transportation planning in the US: An examination of changes in technical aspects of the planning process in response to changing goals

This paper presents a framework for examining the ways in which technical aspects of the regional transportation planning process are changing in response to a broadening of goals and strategies, driven in part by an increased emphasis on public involvement. As an illustration of this framework, the long-range plans of four Metropolitan Planning Organizations (MPOs) in the US are analyzed with respect to goals, performance measures, and use of forecasts. These examples suggest that changes in the technical aspects of the process are lagging changes in planning goals. As a result, plans may implicitly emphasize congestion relief even if they put forth a much broader range of goals. This paper provides a basis for further analysis of the current evolution of transportation planning in the US.     

中国交通基础设施与农村经济增长的实证研究

基础设施作为社会先行资本对经济发展有着重要作用,而交通基础设施是基础设施中很重要的部分,其发展和完善对农村经济增长有着积极的促进作用。使用C-D生产函数对农村农业部门1991～2009年29省市的面板数据进行回归,结果显示交通基础设施产出弹性为0.0327,分东、中、西部三个区域来看中部地区交通设施对经济增长影响最大,加大交通设施的投入不但可以促进中部地区经济增长,而且有利于全国范围的经济增长;对非农部门1998～2007年30省市的面板数据回归结果显示交通设施对非农部门的影响不显著。     

Optimizing the block size in container yards

A block is the basic unit of storage space in container terminals. This study proposes two methods for optimizing the block size, by considering the throughput requirements of yard cranes (YCs) and the block storage requirements. To estimate the YC performance, cycle-time models of various handling operations of YCs are analytically derived. Two types of container yards are examined: those with blocks that are laid out parallel to the quay and those laid out vertical to the quay.     

A bi-objective model for planning and managing rail-truck intermodal transportation of hazardous materials

We propose a bi-objective optimization framework for routing rail-truck intermodal shipments with hazardous materials, when shippers and receivers have access to alternate intermodal terminals. A tabu-search based solution methodology is developed, which together with the optimization framework is applied to realistic size problem instances to gain managerial insights. Our analysis indicates that drayage accounts for a significant portion of transport risk and that it can be reduced by scheduling direct and faster trains; and, that the mix of intermodal trains depends on the interest of the decision-makers, where the resulting traffic can facilitate planning emergency response systems.     

可能速度在交通安全评价中的应用

借助可能速度这一能够直观反映道路线形状况的指标,建立基于可能速度突变量的路段交通事故预测模型,预测得到的事故率可以作为安全系数,依照文中初定的评价标准,可评价突变处对应桩号位置的交通安全状况。     

Alternative congestion pricing schedules

It is important that alternative congestion pricing schedules are compared with respect to a broad spectrum of their effects. This paper uses an equilibrium simulation model of peak-period commuting along an urban highway to compare quantitatively both positive and normative effects of six congestion pricing schedules. Three of these schedules have been investigated qualitatively in the literature; the others are new. The results indicate that flat tolls are favored over smoothly varying tolls for revenue generation or increase in vehicle occupancy, but are disfavored for efficiency maximization, increase in consumer surplus, or reduction in congestion delays.     

Congestion analysis of waterborne, containerized imports from Asia to the United States

A queuing model is introduced for estimating container flow times through port terminals as a function of infrastructure, staffing, and import volume. The model is statistically calibrated on industry data. Flow-time estimates of the model are aggregated with estimates from models previously developed for rail networks to develop estimates of the total container flow times from West Coast ports to inland distribution centers. Integrated with a supply-chain optimization model, the queuing formulas are used to predict import flows by port and landside channel in scenarios of total import growth, varying all-water rates, and a higher import share for nation-wide importers.