考虑储存成本的集装箱公铁联运路径优化

联运企业的效益受运输路径和运输方式的影响。如何降低联运成本、提高联运企业的效益,已成为学术研究的重中之重。针对集装箱公铁联运路径优化问题,以运输成本、换装成本、储存成本、时间惩罚成本构成的运输总成本为目标函数,建立集装箱公铁联运路径优化模型,考虑运输时间限制、班期限制、节点储存成本,得出使运输总成本最低的运输路径及运输方式,并利用算例验证模型的有效性。     

Minimization of passenger takeoff and landing risk in offshore helicopter transportation: Models,approaches and analysis

Offshore petroleum industry uses helicopters to transport the employees to and from installations. Takeoff and landing represent a substantial part of the flight risks for passengers. In this paper, we propose and analyze approaches to create a safe flight schedule to perform pickup of employees by several independent flights. Two scenarios are considered. Under the non-split scenario, exactly one visit is allowed to each installation. Under the split scenario, the pickup demand of an installation can be split between several flights. Interesting links between our problem and other problems of combinatorial optimization, e.g., parallel machine scheduling and bin-packing are established. We provide worst-case analysis of the performance of some of our algorithms and report the results of computational experiments conducted on randomly generated instances based on the real sets of installations in the oil fields on the Norwegian continental shelf. This paper is the first attempt to handle takeoff and landing risk in a flight schedule that consists of several flights and lays ground for the study on more advanced and practically relevant models.     

国家铁路货物整车运输比价关系探讨

铁路整车货运运价率结构对于货运整体收入及市场竞争力具有重要影响。通过对国家铁路货运总体运营价格水平与整车运价率、整车运价率基价1与基价2之间比价关系的分析发现,整车货运比价关系存在的主要问题体现在运价号设置的结构性、对运输成本的抵补、价率水平的均衡性以及与货物品类的对应关系等方面。因此,提出在"一口价"模式下充分考虑运输市场竞争因素、适当调整各运价号基价1与基价2增幅及比值关系、增设新运价号以及与运价浮动管理相结合充分利用3号运价等调整建议。     

中美铁路行业治理制度及其效率的比较分析

本文从铁路行业治理的视角,以铁路企业间的相互依赖性及其行业内协调制度为分析对象,分析中美铁路行业治理制度环境的相似性与差异性,探讨中美铁路行业内协调的制度安排的细节及其差异性,并运用比较制度分析的理论研究中美铁路行业内运营协调的信息体制及其效率差异,分析其清算制度的不同激励效果与适应性差异,阐述其对中国铁路重组的启示。     

中国国有控股航空运输企业治理结构研究

中国国有航空运输企业进行重组后,形成了以中航、南航、东航集团为首的国有航空运输集团公司,初步建立了国有控股的航空运输企业的现代企业制度。但当前有的国有控股航空运输企业法人治理结构尚不完善,尚未形成清晰的、有约束力的决策机构和执行机构,内部治理制约机制失衡,缺乏严格的风险控制,一些制度流于形式,因管理不善给企业造成了巨额损失。要解决这些问题,必须以深化产权改革为基础,以建立董事委员会为突破口,以健全经营者的激励和约束机制为根本,以创造良好的法人治理的外部环境为保障,以此加快完善国有控股航空运输企业的治理结构。     

构建和谐铁路路风系统的理性选择

铁路路风是指铁路的行业风气,是铁路企业和铁路职工经营管理素质、理想纪律素养、职业道德风貌的外在表现,反映铁路企业管理水平和职工精神面貌的综合指标。铁路路风质量的优劣,集中反映在铁路运输产品——旅客和货物的位移质量上。运输产品的全部质量特征包括安全、准确、舒适、迅速、经济、便利和文明服务等诸多方面。旅客和货主就是根据这些来全面判断路风质量优劣的。必须从整体上对路风质量实行全面控制,不能顾此失彼。     

Influential factors in the choice of public transportation or cars as the mode of transportation in habitual commutes / Factores que influyen en la elección del transporte público o el automóvil como modo de transporte en los desplazamientos habituales

The goal of this study is to analyse the differences in attitudes towards habitual modes of transportation among users of public and private transportation. The explanatory capacity of attitudes when determining the mode choice, along with the structural and sociodemographic factors, are also verified. The study was performed in three Spanish cities with 742 participants. The results revealed that cars are better rated than public modes of transportation in the attributes associated with immediate advantages (i.e., speed and availability) and convenience. Subways are highly rated in both immediate and deferred advantages (environment, safety, cost and health). Buses are the mode rated the lowest of the three. Using logistic regression, it was verified that the variance explained by a model that includes attitudes (R² = .639) is higher than the variance explained by a model based solely on variables related to infrastructures (R² = .489). The discussion of these results includes proposals aimed at decreasing car use.     

航空客运收益管理的结构模型

本文分析了收益管理决策目标的组成要素以及内外主要因素;讨论了容量、价格和销售数量三个决策变量与市场需求要素之间的关系;具体地提出了达到收益管理目标可以采用的两条降低成本的途径和五种提高收入的基本方式;从系统的角度提出了集成性收益管理决策的结构模型。     

关于促进河北交通运输业科学发展的思考

交通运输业是国民经济的重要基础性产业,又是引领发展的先导性产业.在现代经济产业布局和经济结构调整中,交通运输业发挥着极其重要的支撑、服务和先导作用.河北省交通运输业只有以科学发展观为统领,在"全面、协调、可持续发展"原则基础上统一规划,多元并进,才能真正实现又好又快发展.     

论城市交通的伦理维度

在分析城市交通中交通公平与交通生态性的内涵特征的基础上,从城市交通政策、交通规划、工程设计与交通组织管理四个层面,探讨了城市交通的伦理内涵。指出城市交通系统运营除了要遵守社会公认的伦理道德规范,更应兼顾出行效率、交通公平与生态性,从而使城市交通符合伦理诉求。