论城市交通网对旅游交通的影响--以重庆为例

旅游交通是旅游业发展的充要条件，交通条件的优劣在很大程度上决定了旅游经济发展的快慢。笔通过分析重庆市旅游交通条件的现状，认为必须依托城市交通网进行旅游线路布局，并提出了改善重庆旅游交通条件的对策措施。     

Collusive Long-Run Investments Under Transmission Price-Caps

In the short run, constraints in the electricity transmission system may give market power to generators. This paper examines whether the constraints themselves are a long-run equilibrium outcome in a competitive environment. We show that independent transmission companies and generators can tacitly collude to raise prices to consumers and divide the resulting profits. We also show that price cap regulation does not prevent this behavior and may in fact contribute to it. The mechanism for collusion is that generators locate their plants so that a capacity-constrained transmission line lies between them and their consumer market. We show that this constraint-based collusion can be sustained in a static game without any punishment strategies.     

The Application of Sensitivity Analysis on Comprehensive Transportation Evaluation

Comprehensive transportation evaluation objects using multi-objective decision method is a process of choosing the best one from a few objects through calculating, analyzing, and comparing the index system. The result may be different because of the difference of the index weight and index value. Therefore, sensitivity analysis should be one of the necessary parts of the decision-making. It is desired to give the index with higher sensitivity and its varying scope to control the index strictly during the execution process. This paper derives transfer index weight, which changes the rank evaluation order of the projects. Meanwhile, a simple, effective and practical method based on sensitivity district and sensitivity matrix is proposed for the sensitivity analysis of decision-making. As an example, the index sensitivity in decision-making of some provinces comprehensive transportation objects, and their influence on the final decision are discussed.     

The hidden value of air transportation infrastructure

Air transportation is a key strategic asset in that it provides access to markets and thereby enables the economic development of nations. Thus, in order to maintain their competitiveness in a global economy, countries must invest in air transportation infrastructure to ensure their ability to meet current and future demand for aviation services. The objective of this paper is to develop and illustrate a methodology for evaluating the strategic value of air transportation infrastructure, in particular the benefits associated with the ability to react quickly to changes in the market. The hypothesis is that by recognizing and taking advantage of this strategic value, it may be possible to design better policies for aviation infrastructure delivery.The methodology developed here uses system dynamics to model different strategies for infrastructure delivery. These strategies are defined by three variables: the amount of capacity increase, the time to deliver the capacity and the congestion threshold that triggers the need for capacity delivery. Monte Carlo simulation is used to take into account multiple sources of uncertainty. The model shows that a strategy of capacity delivery based on small increments and short response times can yield more benefits than strategies that consider large capacity increases and long response times. Furthermore, in the specific airport example considered here, it was found that a congestion threshold of 75% should be the trigger for capacity enlargements if strategies based on small capacity increments and 1 or 5 years to increase capacity are considered. The lesson for decision-makers is that congestion delays must be addressed with foresight.     

加速城市建设应注意的几个问题

目前,我国城市化进程不断加快,城市数量增加,规模扩大,成效显著.但是,也必须清醒地看到,城市建设工作中的短期行为和浮躁之风相当严重,应当引起人们的高度重视.本文认为,城市规模扩张必须以产业支撑为前提,不能搞空壳城市;城市公共设施建设慎向民资伸手,不能滥用市场化手段;居民区搬迁改造应多些人文关怀,不能一拆了之;应遵循城市发展的客观规律,正确处理城市建设中的几个关系问题.     

武陵山片区旅游节点交通畅达性研究

区域旅游节点的交通畅达性对区域经济发展具有强劲的推动作用,区域旅游节点的交通畅达性优劣取决于内部的连通性和外部的可达性。文章基于因子分析法分别就高等级公路、高速公路、普铁、高铁(动车)、民航航线等因素对武陵山片区内各旅游节点的交通畅达性的影响进行了评价分析,对各旅游节点的畅达性进行了排名;并选取2010、2014、2018年等3个时间节点数据导入GIS生成3个片区旅游交通图。研究发现:①重庆、武汉、长沙、贵阳四大中心城市的交通连线支撑起武陵山片区的交通网络,片区旅游节点之间的畅达性逐步提升;②处于武陵山片区外围重庆、武汉、长沙、贵阳四大中心城市交通大廊道上的旅游节点之间畅达性处于片区前列;③同一省市或同一传统旅游线路的旅游节点连通性较好,分属不同省市的旅游节点之间连通性普遍较差;④历史上,山高谷深、交通闭塞,各地市自然旅游资源丰富多样,文化旅游浓郁独特,近年来,武陵山片区旅游发展与交通建设相互推拉,呈现良性发展。     

浅析运输方式的绿色化

在中国环境危机和能源危机日益严重的背景下，物流业面临严峻的挑战．因此物流绿色化已成为物流管理系统的发展趋势。本文将从物流过程中的运输环节入手，通过分析传统运输的弊端，探索新型的运输方式，以提高物流绿色化水平。     

物流运输网络中的网络容量扩张成本效益均衡模型及算法研究

在给定一个单源单汇物流运输网络中，网络中的每条弧都有一个容量和运输时间的限制，研究了当网络的容量提高到指定水平，同时限制从网络中源点到汇点运输时间，应该如何对网络进行适当的扩张，减少网络的运输时间，同时使网络效益与预期效益尽可能的接近。     

铁路运输向现代物流发展的分析与对策

分析我国铁路运输向现代物流发展的必要性及其所具备的优势，并针对目前铁路运输存在的问题．提出其向现代物流发展的对策和建议，     

基于遗传算法的多目标集装箱多式联运运输优化模型

基于集装箱多式联运在进行门到门的运输过程中可以选择多种运输方式和路径的组合进行优化运输这个特点，本文将多式联运的运输优化问题转化成为一个最短路径问题，以成本和时间为优化目标建立了选择最优路径的模型，并选择遗传算法作为求解算法对实例问题进行了求解验证。