基于非合作博弈的珠三角集装箱港口发展研究

对于珠江三角洲集装箱港口的建设与竞争问题进行分析,认为竞争是在提供同质服务的寡头之间进行的,建立古诺双寡头垄断模型,得到非合作博弈的纳什均衡,认为博弈参与者数量增加,合谋与合作的收益能够进一步显现.基于非合作博弈理论的分析得到合作机制的形成.针对珠江三角洲港口群体合作的可能与方式进行研究.     

企业经济发展的动力在于不断创新

该文认为企业在市场中立于不败之地的必然之路是创新,并从思想创新、机制创新和技术创新三个方面分别阐述了创新的内容及措施。     

Estimating Missing Traffic Volume Using Low Multilinear Rank Tensor Completion

Traffic volume data have been collected and used for various purposes in some aspects of intelligent transportation systems (ITS) applications. However, the unavoidable detector malfunction can cause data to be missing. It is often necessary to develop an effective approach to recover the missing data. In most previous methods, temporal correlation is explored to reconstruct missing traffic volume. In this article, a new missing traffic volume estimation approach based on tensor completion is proposed by exploring traffic spatial–temporal information. The tensor model is utilized to represent traffic volume, which allows for exploring the multicorrelation of traffic volume in spatial and temporal information simultaneously. In order to estimate the missing traffic volume represented by the tensor model, a novel tensor completion algorithm, called low multilinear rank tensor completion, is proposed to reconstruct the missing entries. The proposed approach is evaluated on the PeMS database. Experimental results demonstrate that the proposed method is more effective than the state-of-art methods, especially when the ratio of missing data is high.     

高职汽车类技能大赛资源转化校本化的研究

职业院校开展技能大赛是为了响应现代化素质教育的号召,为学生提供更多展示自我价值的平台,助力我国职业教育工作的顺利开展,汽车类专业是职业院校体系中的重要构成,技能大赛资源的有效转化基于校本化发展理念.通过教学方式的改变,全面提高职业院校汽车类专业人才得培养质量,满足现代化市场经济环境下企业持续发展提出的人才需求.本文主要...     

Exchange rate changes and the cost competitiveness of international airlines: The Aviation Trade Weighted Index

Discussions of how changes in exchange rates impact on international airlines tend to be ambivalent. In this paper, it is shown that the relative cost competitiveness of an international airline will decline when there is an exchange rate appreciation in its home country - as will be the case for other tradable goods and services. The extent to which this happens depends on which countries the prices of the inputs are set in and also on which countries' airlines it is closely competing with. The impact is greater if there is an appreciation relative to those countries whose airlines the home airlines are closely competing with. In the trade literature, this is recognised in the Trade Weighted Index of exchange rates, which weights exchanges rates according to their importance in a country's trade flows. In this paper, an Airline Trade Weighted Index is developed - the weights for this index depend on airline traffic and revenues on routes to and from a country. The ATWI is calculated for Australian international airlines, and it indicates that there has been a significant loss of competitiveness in recent years, due to the appreciation of the Australian dollar relative to currencies of key airline competitor countries.     

空间数据挖掘技术

随着数据挖掘技术的不断发展与成熟,空间数据挖掘已成为人们研究的热点之一。虽然现在还没有一个空间数据挖掘的实用系统,但展望前景空间数据挖掘可广泛用于遥感图象处理、地理信息系统、计算机地图制作等领域。 本文基于知识种类的划分,展现了一些具有代表性的新的空间数据挖掘技术。     

A constraint programming model with time uncertainty for cooperative flight departures

The lack of a proper integration of strategic Air Traffic Management decision support tools with tactical Air Traffic Control interventions usually generates a negative impact on the Reference Business Trajectory adherence, and in consequence affects the potential of the Trajectory-Based Operations framework. In this paper, a new mechanism relaying on Reference Business Trajectories as a source of data to reduce the amount of Air Traffic Controller interventions at the tactical level while preserving Air Traffic Flow Management planned operations is presented. Artificial Intelligence can enable Constraint Programming as it is a powerful paradigm for solving complex, combinatorial search problems. The proposed methodology takes advantage of Constraint Programming and fosters adherence of Airspace User’s trajectory preferences by identifying tight interdependencies between trajectories and introducing a new mechanism to improve the aircraft separation at concurrence events considering time uncertainty. The underlying philosophy is to capitalize present degrees of freedom between layered Air Traffic Management planning tools, when sequencing departures at the airports by considering the benefits of small time stamp changes in the assigned Calculated Take-Off Time departures and to enhance Trajectory-Based Operations concepts.     

Port competition with accessibility and congestion: a theoretical framework and literature review on empirical studies

This review interprets recent studies of the interactions between the competition of gateway seaports and the accessibility of landside transportation links to inland regions. Port competition is treated as part of a rivalry between two transportation chains. This article identifies the main modeling approaches and defines the different types of hinterland access systems described in the literature. A general theoretical framework is then proposed to incorporate those key components. The importance of the proposed framework is revealed by comparing and extending results from the literature. Major assumptions that need further empirical verification are identified and discussed, and related empirical studies are reviewed. Finally, avenues for further research are discussed.     

考虑腹地关系的内河港口竞争策略分析

针对上下游两个内河港口之间的竞争问题,考虑相邻港口同时选择单一定价、单一定价—差别定价、差别定价—单一定价和差别定价4 种竞争策略情形下,运用Hotelling 博弈方法,在考虑港口之间水运成本的情况下,对不同竞争阶段港口的均衡价格、市场份额和利润进行了比较. 研究表明：港口的均衡结果与两港的位置和水上、陆路单位运费率之比有关;只有单一港口选择差别定价时,其可以获取更高的市场份额和利润;分别以不同阶段的市场份额、利润作为支付函数,上下游港口的纳什均衡均为差别定价策略.     

A three-stage computational approach to network matching

Network matching is frequently needed for integrating data that come from different sources. Traditional ways of finding correspondences between networks are time-consuming and require considerable manual manipulation. This paper describes a three-stage matching algorithm (node matching, segment matching, and edge matching) that combines bottom-up and top-down procedures to carry out the matching computation. As it uses sensitive matching measures, the proposed algorithm promises good improvement to existing algorithms. An experiment of matching two waterway networks is reported in the paper. The results of this experiment demonstrate that a reasonable matching rate and good computational efficiency can be achieved with this algorithm. The paper also briefly discusses necessary improvements in areas of linear alignment, aspatial matching and higher-level matching.