上海市道路货运结构的经济适应性评价

分析上海市道路货运结构与国民经济的适应性。采用DEA数据包络分析方法,通过选取国民经济指标及道路货运结构指标,评价上海市道路投入及经济产出的有效性,进而说明上海市现状的道路货运结构与国民经济的适应性。最后,通过模型结果分析上海市道路货运结构中存在的问题,并为道路货运结构的调整提供合理性建议。     

A translog cost function of the integrated air freight business: The case of FedEx and UPS

This paper analyzes the cost structure of the integrated air freight business by means of a translog cost function. This allows to extend knowledge on the supply side and to examine if strategies of integrators are consistent with cost structure. The cost function is based on quarterly time-series data from 1990 to 2010 for FedEx and UPS. A total and a variable model are estimated. In addition, a static as well as a dynamic approach is followed. We find that integrators exhibit strong scale and density economies in the short and the long term. This result is in line with the aggressive expansion and cooperation strategies pursued by integrators. Our results indicate that the concentration in the integrated air freight industry will continue: a concern for industry actors and regulatory agencies.     

Origin–destination missing data estimation for freight transportation planning: a gravity model-based regression approach

This paper develops a log-linear regression approach to estimate missing data in a sparse origin–destination (O–D) matrix assuming the sampled or observed O–D trips follow a good gravity pattern. The approach is tested with randomly selected samples from the known portions of 1997, 2002, and 2007 US Commodity Flow Survey (CFS) O–D value and tonnage matrices and validated with 2007 US O–D tonnage matrix at the state level. The missing data are also estimated for the 2007 CFS tonnage matrix with the best intercept and coefficients obtained using all known entries of the matrix. The concept of the approach can be extended beyond the gravity model to any strong mathematical pattern embedded in the known set of a sparse O–D matrix to estimate its missing cells.     

专线 4245A道岔在运营中的常见病害及整治措施

遂成高铁在大英东、积金南、准口南站,正线通过的岔道,均采用专线4245A型道岔。营运3年以来发生了路基沉降、线位偏移、轨道框架失稳等病害。针对客专道岔（专线4245A）在遂成线运营中的常见病害进行分析,提出了遂成线道岔精调及病害整治的具体措施。     

客运专线综合维修天窗设置研究

在高密度、高速度行车条件下,综合维修天窗开设方式和维修时间的确定对客运专线的通过能力、行车组织方式有很大影响。文中对“单线隔日维修型”这种天窗形式进行分析,通过模拟铺画列车运行图,分析“单线隔H矩型”天窗对客运专线跨线列车行车组织所带来的影响,讨论不同天窗形式相互衔接对跨线列车运行线铺画的影响。     

关于国际货运代理企业扣留提单问题的探讨

最高人民法院新的司法解释《关于审理海上货运代理纠纷案件若干问题的规定》（以下简称“规定”）已于2012年5月1日起正式开始实施.该“规定”主要调整货运代理企业接受委托办理与海上货物运输有关的货运代理事务时与委托人之间形成的权利义务关系.在货运实践中,货运代理企业常常以拒绝交付提单等运输单证作为促使委托人支付相关费用的先决条件,产生了很多纠纷.在新的“规定”中对于货运代理企业扣留提单等单证问题,最高人民法院给予了新的解释,对国际货运代理企业的行为进行了重新的定义和规范.     

在电子商务环境下的整车货运业务的流程研究

随着我国基础设施的进一步完善,多种货物运输方式的出现对中国的铁路货运提出了新的挑战。当前我国铁路货运模式是在计划经济的背景下制定的,以货运计划为核心。这种货运模式与当前的铁路货运需求存在很大的差异,已经不能满足货物运输市场需求。本文应用电子商务的理论和技术,设计了适合电子商务环境下运作的铁路货运业务流程。作者通过对传统整车货运流程的分析,运用流程再造理论,对铁路整车货运的三个关键环节进行了作业流程优化研究,提出了电子商务模式下铁路货运整车业务办理流程。     

考虑定制化列车的运行图与能力协同优化方法

基于调查数据建立旅客在不同时间段的乘车概率函数,分析旅客对定制化列车的开行时间及坐席类型等具体需求。考虑需求、停站、运行时间等约束条件建立定制化列车开行备选集,整合可行的定制化列车开行方案。建立加开定制化列车情况下,同时满足企业收益最大化和剩余可用能力最大化的双层协同优化模型。构建优化算法进行模型求解,得到基于定制化列车,且同时考虑既有列车调整成本和能力使用情况的运行图。最后,以内蒙古自治区呼和浩特-乌海线路为例进行分析,结果表明,既有列车的单位调整成本会影响定制化列车的开行,定制化列车的开行对运行图的整体结构和剩余可用能力也均有影响。     

Design and development of a stated choice experiment for interdependent agents: accounting for interactions between buyers and sellers of urban freight services

Stated choice experiments have proven to be a powerful tool in eliciting preferences across a broad range of choice settings. This paper outlines the elements of a group-based experiment designed for interdependent urban freight stakeholders, along with the procedure to administer the questionnaire sequentially. The focus is on the design of a computer-assisted personal survey instrument and the value in disseminating the details of a new approach to design and collect stated choice data for interacting agents. The paper also discusses how to specify a reference alternative, and then how to recruit appropriate real-market or representative decision-making group members to participate in a subsequent phase of the survey, which incorporates the reference alternative and contextual information from an initial phase. The empirical strategy, set out in some detail, provides a new framework within which to understand more fully the role that specific attributes, such as variable user charges, influencing freight distribution chains might play, and who in the supply chain is affected by specific attributes in terms of willingness to pay for the gains in distribution efficiency.

关于货车闸瓦金属镶嵌物(熔渣)产生原因的探讨

分析了货车闸瓦产生金属镶嵌物的原因,提出了运用中的预防措施。