Stochastic resource allocation for containerized cargo transportation networks when capacities are uncertain

We consider the stochastic resource allocation problem for containerized cargo transportation with uncertain capacities and network effects, in which a freight operator needs to allocate a certain amount of capacity to each product to maximize the expected profit. We formulate the problem as a constrained stochastic programming model and provide theoretical results that completely characterize the optimal solution to the model under a special case. Under a general case, we build an approximation model of the problem and propose a sampling based algorithm to solve the approximation model. A number of numerical experiments are offered to test the algorithm.     

提高东黄复线输量的可行性方案

增加昌邑站、寿光站输油设备及自动化改造,添加减阻剂和发清管球清管作业等几个方面,对东黄复线有针对性的提出改造方案,达到其增输目的,实际已经进行了更换过滤网、流程改造和添加减阻剂提压试验,增大了输量。     

浅析大陆桥过境物流业务的风险与规避

1992年12月1日，首列连云港-阿拉山口的大陆桥过境集装箱运输直达专列营运，开启了新亚欧大陆桥运输事业的新纪元，自此，大陆桥运输业务成为口岸与企业提高竞争力的有效手段，为丰富物流业务种类和口岸经济发展做出了巨大的贡献。20余年来，大陆桥过境运输业务不断发展壮大，在为大陆桥过境运输承运人带来巨大利润的同时，也隐含着较大的业务风险。文中拟对大陆桥过境物流业务中存在的风险进行梳理，并提出几点风险规避措施，以供商榷。     

广西融入泛珠三角的交通发展战略思考

广西作为我国唯一与东盟既有陆地接壤又有海上通道的省区，也是我国进入东盟最便捷的通道，其具有三沿优势。文中首先分析了广西的地理优势，接着分析了广西综合交通现状，最后分析了广西交通融入泛珠三角的相关建议。     

Shortest path or anchor-based route choice: a large-scale empirical analysis of minicab routing in London

Understanding and modelling route choice behaviour is central to predicting the formation and propagation of urban road congestion. Yet within conventional literature disagreements persist around the nature of route choice behaviour, and how it should be modelled. In this paper, both the shortest path and anchor-based perspectives on route choice behaviour are explored through an empirical analysis of nearly 700,000 minicab routes across London, United Kingdom. In the first set of analyses, the degree of similarity between observed routes and possible shortest paths is established. Shortest paths demonstrate poor performance in predicting both observed route choice and characteristics. The second stage of analysis explores the influence of specific urban features, named anchors, in route choice. These analyses show that certain features attract more route choices than would be expected were individuals choosing route based on cost minimisation alone. Instead, the results indicate that major urban features form the basis of route choice planning – being selected disproportionately more often, and causing asymmetry in route choice volumes by direction of travel. At a finer scale, decisions made at minor road features are furthermore demonstrated to influence routing patterns. The results indicate a need to revisit the basis of how routes are modelled, shifting from the shortest path perspective to a mechanism structured around urban features. In concluding, the main trends are synthesised within an initial framework for route choice modelling, and presents potential extensions of this research.     

重庆市航空运输产业关联与波及效应分析

重庆航空运输业发展相对滞后,研究重庆与上海航空运输业的关联差异,为重庆航空运输业的发展提供理论依据。以重庆和上海两市的投入产出表为基础,构建投入产出模型,分析两市航空运输产业关联和波及效应。对比计算结果发现:重庆航空运输业后向关联度较低,内部关联效应较弱;与第三产业的关联效应有待加强;对经济发展的推动力较弱,拉动效应明显。为了更好地发展航空运输业,重庆应特别注重加强航空运输业与第三产业的关联效应。     

开放合作下传统运输企业向现代物流企业的转型模式研究

文中研究以在开放合作的环境下传统运输业如何向现代物流的转型作为研究对象，探讨了传统运输业与现代物流的关系，传统运输企业的转型所面临的主要问题，总结出传统运输企业向现代物流转型的四种模式，并应用SWOT方法分析了四种模式各自适用的情形。     

Tourism's external account and the balance of payments

This paper argues that the balance of payments on tourism account is not the best measure of economic tourism activity needed for good policy formulation at the government level. The balance on tourism should be replaced with a broader concept, tourism's external account, which includes expenditures and receipts from tourists together with those other international transactions which follow indirectly from tourism. This concept will provide a broader understanding of the tourism industry so that better policy decisions can be made.