公路货运量预测的系统动力学模型构建

用系统工程的观点对公路货运系统进行了综合、动态的分析,在具体分析公路货物运输系统主要影响因素的基础上,分别构建了道路运输需求及供给的子系统动力学模型,该模型可以通过计算机进行模拟,进行公路货运量的预测。     

城市圈交通一体化研究

世界城市圈大多是经济文化较发达的地区,城市圈的发展状况与圈内交通问题密切相关。从城市圈和区域交通一体的概念入手,深入分析区域经济一体化与区域交通一体化的关系,在此基础上,结合我国城市圈交通一体化发展现状及存在的主要问题进行探讨,提出适应我国城市圈交通一体化发展的对策。     

运输市场企业定制营销模式浅析

对于运输市场而言,消费者的逐渐成熟和多元化发展势必对其提出更高的要求,采用定制营销策略无疑是运输企业适应社会发展需要,顺应时代潮流的一项明智之举.     

道路运输业规制改革探讨

应用规制理论,对我国道路运输业从市场准入、运价及税收等方面提出规制改革设想,有益于我国道路运输业改革的深入.     

加速公路运输业向物流的发展和融合

面对物流的新课题,一方面,运输企业要抓住机遇努力向现代物流融合,另一方面,也要从实际出发,循序渐进,充分利用现有设备,包括利用客户和其他行业现有的设施和设备,注重在调整、重组中发展物流.只有这样,我国公路运输业的现代化进程才能跃上一个新台阶.     

Efficient missing data imputing for traffic flow by considering temporal and spatial dependence

The missing data problem remains as a difficulty in a diverse variety of transportation applications, e.g. traffic flow prediction and traffic pattern recognition. To solve this problem, numerous algorithms had been proposed in the last decade to impute the missed data. However, few existing studies had fully used the traffic flow information of neighboring detecting points to improve imputing performance. In this paper, probabilistic principle component analysis (PPCA) based imputing method, which had been proven to be one of the most effective imputing methods without using temporal or spatial dependence, is extended to utilize the information of multiple points. We systematically examine the potential benefits of multi-point data fusion and study the possible influence of measurement time lags. Tests indicate that the hidden temporal–spatial dependence is nonlinear and could be better retrieved by kernel probabilistic principle component analysis (KPPCA) based method rather than PPCA method. Comparison proves that imputing errors can be notably reduced, if temporal–spatial dependence has been appropriately considered.     

Port authorities view state coastal management programs

Abstract

An estuarine sanctuary is a store of public values due to the ecological, cultural, recreational, aesthetic, historic, and economic services provided by the preserve. These values may be expected to increase over time because of (1) growth in the population demanding estuarine services, (2) growth in the willingness to pay for such services, and (3) growth in the actual quality and quantity of services which are provided by a protected natural system. Thus an estuarine sanctuary will be more valuable to future generations than to current generations. When weighing the cost and benefits of a preservation or development decision, a preservation decision which seems currently undesirable may in fact be socially beneficial when growth in the value of estuarine services is included.     

Breakthrough innovations in intermodal freight transport

Breakthrough innovations, whether technological, organizational or both, are a necessity if the market share of intermodal freight transport is to expand. The main growth potential lies in the markets for flows over short distances, for perishable and high-value commodities, for small consignments, and for flows that demand speed, reliability and flexibility. It will take radical innovations to produce a breakthrough in the modal split and allow these new markets to be conquered. This special issue is based on papers presented at an international conference on freight transport automation and multimodality, held in Delft in May 2002, that are illustrative of the direction of breakthrough research and development (R&D) aimed at increasing the market share for intermodal transport.     

Discussions on rail in urban areas and rail history

This paper includes discussions on rail in urban areas and railway history. More specifically commonly used terms and definitions for rail services, policy and practice in urban areas are discussed followed by an overview of railway developments around the world.     

综合运输通道耗散结构分析

基于各种运输方式的技术经济特征和交通运输业可持续发展理念,借助于耗散结构理论,研究综合运输通道是一个具有耗散结构特性的开放系统。通过对综合运输通道结构的分析,实现综合运输通道内各种运输方式的协调发展,合理竞争;满足人们出行与货运需求;不断完善和提高各种运输方式适应环境的能力,实现通道内外的和谐可持续发展。