基于供需平衡的城市路内停车合理规模分析模型

分析了影响路内停车需求和限制路内停车泊位供应的主要因素，提出了一种确定城市中心区路内停车泊位总体规模的方法：利用城市规模、经济水平等城市宏观指标对路内停车需求进行预测；同时，考虑路网容量，在路网饱和度允许的约束条件下以出行者的广义综合成本最小为目标，从而来确定与路外停车相匹配的路内停车泊位供应规模；然后，比较路内停车需求与路内泊位的供应能力，在尽量满足供需平衡的前提下再考虑管理、周转率等因素。给出建议的路内停车总体规模，为城市中心区的路内停车规划提供依据。文章最后给出实例估算，验证模型的有效性和实用性。     

基于B/S结构的高速公路机电设备维护费用预算系统设计与实现

介绍一种基于B/S结构的高速公路机电设备维护费用预算系统设计方法与具体实现,该系统的理论基础为国家公路工程概预算理论体系,采用ASP.NET技术实现,数据库接口采用ADO.NET,编程语言采用C#.实践证明,该系统具有界面友好、交互能力强、操作方便、易上手、实用性强等特点.     

Is telecommuting cheaper than travel? An examination of interaction costs in a business setting

This paper presents an analysis of telecommunications and travel costs for typical business meetings. It is contribution to the debate on the substitutability of telecommunications for travel. An underlying assumption which supports the substitution hypothesis is that the cost of traversing distance through the use of telecommunication is lower than the cost of travelling.This paper addresses the relative cost of telecommunications and travel in conducting interactions. Three factors are assumed to determine these costs: distance, duration of interaction and number of participants. The analysis assumes that cost alone affects choice, and ignores other communication qualities.The relationship between telecommunication and travel costs was tested quantitatively through a case study of typical business meetings in the U.S., based on data from 1988. The results show that travel costs are lower than telecommunication costs for shorter distances, and that the relationship between telecommunications and travel costs differs substantially as a function of number of participants and meeting duration. Because of ongoing rapid changes in the costs of both of these interaction modes, the complex competition between them will continue. The implications of the findings for location decisions and policy-making are discussed.     

Nonlinear pricing on private roads with congestion and toll collection costs

Nonlinear pricing (a form of second-degree price discrimination) is widely used in transportation and other industries but it has been largely overlooked in the road-pricing literature. This paper explores the incentives for a profit-maximizing toll-road operator to adopt some simple nonlinear pricing schemes when there is congestion and collecting tolls is costly. Users are assumed to differ in their demands to use the road. Regardless of the severity of congestion, an access fee is always profitable to implement either as part of a two-part tariff or as an alternative to paying a toll. Use of access fees for profit maximization can increase or decrease welfare relative to usage-only pricing for profit maximization. Hence a ban on access fees could reduce welfare.     

A Bayesian model to assess rail track geometry degradation through its life-cycle

One of the major drawbacks in rail track investments is the high level of uncertainty in maintenance, renewal and unavailability costs for the Infrastructure Managers (IM) during the life-cycle of the infrastructure. Above all, rail track geometry degradation is responsible for the greatest part of railway infrastructure maintenance costs. Some approaches have been tried to control the uncertainty associated with rail track geometry degradation at the design stage, though little progress has improved the investors' confidence. Moreover, many studies on rail track life-cycle cost modelling tend to forget the dynamic perspective in uncertainty assessments and do not quantify the expected reduction of the uncertainty associated with degradation parameters as more inspection data is collected after operation starts.     

论BT模式下融资费用的确定方式

介绍BT模式和融资费用的概念,对影响融资费用的主要因素进行分析,阐述固定总价包干形式下融资费用的确定方式和过程,以及管理工作面临的工期、算法、风险3类突出问题,并针对这些问题给出科学合理确定融资费用的办法.     

Longer and heavier vehicles in Belgium: A threat for the intermodal sector?

To achieve transport cost reductions and to reduce the environmental impact of road transport, different European countries are allowing or testing longer and heavier vehicles on their road network. In Belgium, the Flanders region started a trial in 2015 allowing a limited number of longer and heavier vehicles on a selection of approved routes. A concern among intermodal operators is however that an allowance of longer and heavier vehicles could trigger a reverse modal shift away from rail and inland waterways container transport. Starting from experiences in other European countries, this paper discusses the potential spatial impact of allowing longer and heavier vehicles on the market areas of intermodal transhipment terminals using a geographic information systems-based location analysis model. In a second step, external transport costs are incorporated in this model, to quantify the spatially diversified societal costs of a potential reverse modal shift.