A Study on Integrated Construction of Luzhou Comprehensive Transportation Hub

The target of integrated construction of comprehensive transportation hub is to integrate the traffic resources,achieve butt joint of pan-regional transportation mode,and finally realize the"seamless connection"of the goods and"zero transfer"of the passenger traffic.Relying on the particularity of the geographical location and the convenience of the Yangtze River channel,Luzhou puts forth effort to build a comprehensive transport hub in Southern Sichuan and has made great efforts in traffic infrastructure construction.However,there are still some problems.Combining practice of Luzhou,using the advanced experience of foreign and domestic cities for reference,the paper pointed out that for the sake of constructing a comprehensive transportation hub,we need to build the traffic integration on the basis of the efficiency.Besides,the paper proposed the strategies for construction.

Optimal Allocation of Public Transport Hub Based on Load Loss Value and the Economy of Distribution Network

The rapid development of electric buses has brought a surge in the number of bus hubs and their charging and discharging capacities.Therefore,the location and construction scale of bus hubs will greatly affect the operation costs and benefits of an urban distribution network in the future.Through the scientific and reasonable planning of public transport hubs on the premise of meeting the needs of basic public transport services,it can reduce the negative impact of electric bus charging loads upon the power grids.Furthermore,it can use its flexible operation characteristics to provide flexible support for the distribution network.In this paper,taking the impact of public transport hub on the reliability of distribution network as the starting point,a three-level programming optimization model based on the value and economy of distribution network load loss is proposed.Through the upper model,several planning schemes can be generated,which provides boundary conditions for the expansion of middle-level optimization.The normal operation dispatching scheme of public transport hub obtained from the middle-level optimization results provides boundary conditions for the development of lower level optimization.Through the lower level optimization,the expected load loss of the whole distribution system including bus hub under the planning scheme given by the upper level can be obtained.The effectiveness of the model is verified by an IEEE-33 bus example.

The Hub Status and Transportation Network of Kribi Port

In this paper, a study on four African ports was taken out that all have the ca-pability to become a hub port that can serve the central African region. The paper sort to determine which port was most suitable and port indexing was the method that was used to evaluate these ports. The ports evaluated were the port of Kribi, the port of Bata, the port of Libreville and the port of Pointe-Noire. There were other models that were also used which included linear regression and linear programming which all contributed to providing the final results of the port with the most suitable potential to serve as a hub port and meaningful results were obtained. The final results showed that the port of Pointe-Noire was the most suitable port to serve the central African region as a hub port.

A Study on Integrated Construction of Luzhou Comprehensive Transportation Hub

The target of integrated construction of comprehensive transportation hub is to integrate the traffi c resources, achieve butt jointof pan-regional transportation mode, and fi nally realize the “seamless connection”of the goods and “zero transfer” of the passenger traffi c.Relying on the particularity of the geographical location and the convenience of the Yangtze River channel, Luzhou puts forth effort to build acomprehensive transport hub in Southern Sichuan and has made great efforts in traffi c infrastructure construction. However, there are still someproblems. Combining practice of Luzhou, using the advanced experience of foreign and domestic cities for reference, the paper pointed out thatfor the sake of constructing a comprehensive transportation hub, we need to build the traffi c integration on the basis of the effi ciency. Besides, thepaper proposed the strategies for construction.

考虑Hub网络拥堵的轴辐式网络优化

在轴辐式网络背景下,枢纽节点通过集散货物,产生规模经济效应来降低成本。但同时也会增加Hub网络拥堵的可能性和成本的增加。首先,为缓解Hub网络拥堵并降低其造成的经济损失成本,提出与轴辐式网络节点流量相关的拥堵成本函数。其次,在保证轴辐式网络节点正常货物运输的前提下,最大限度的平衡货物运输规模经济效应和产生的Hub网络拥堵成本,建立混合整数非线性规划模型,以最小化运输成本、建设成本和拥堵成本为目标。最后,引用实际算例验证Hub网络拥堵对网络优化的影响与模型的合理性。对于未来如何平衡规模经济效应和Hub网络拥堵的轴辐式网络优化有重要的参考价值。

Hub-and-Spoke型运输网络改善方法及其应用

Hub-and-Spoke(本文简称为HS)网络形式被广泛采用于多个领域,其在实践中显现的缺陷也为学术界所重视。本文采用运输车辆空驶吨公里作为评判标准,以"中途点停靠"(pickup stopover)的形式改善HS型运输网络。通过解析法获得HS运输网络结合中途点停靠运输模式的适用条件,并以我国公路快速货运业干线运输组织为对象加以实证分析。相比于运筹学领域优化计算方法而言,这种针对HS运输网络改善方法的可行性论证过程简单而实用。

美国一级铁路公司UP与快递物流公司Hub的合作研究

美国一级铁路公司UP与快递物流公司Hub的合作是美国发展多式联运的成功案例之一。从UP与Hub的合作背景、合作措施和合作效果等3个方面对二者的合作案例展开分析。从合作的行业背景来看:美国对铁路运输管制政策的放松推动了市场竞争;铁路运输虽然具有运量大、能耗低、安全性高等优势,但无法提供“门到门”的运输服务;公路运输虽然灵活性高,但也面临着尾气排放带来的环境污染、卡车司机的高离职率等问题的困扰;公铁优势互补成为UP和Hub开展多式联运合作的基础。从合作的微观背景来看:UP和Hub经历了从一般商业往来到正式合作的演变历程,在这一过程中双方公司经营环境的变化是促使合作达成的重要原因。从具体的合作措施来看:UP长期坚持以Hub为大客户导向的经营战略,通过合理规划布局多式联运货场、在货场内提供高效的安检和装卸设备、安排灵活的货运列车时刻表、建立互联互通的EDI系统等措施满足Hub的运输需求,并在合作中不断提高运输时效性和安全性;Hub在合作中逐渐减少对UP提供的集装箱的依赖,向重资产战略调整和转移,以适应市场竞争和需求的变化。从合作效果来看:UP与Hub的合作使双方的多式联运业务收入都显著增加;多式联运分工专业化程度加深;Hub的社会形象也得到改善。通过研究UP与Hub的合作案例,总结了3点发展多式联运的成功经验:(1)政府要逐步放松铁路管制政策、降低行业准入门槛并引入市场竞争;(2)铁路运输公司要长期坚持以快递物流公司为大客户导向的经营战略;(3)多式联运参与主体要根据市场需求和竞争的变化适时调整经营战略。

宝中增建二线引入中卫铁路枢纽方案研究

在中卫铁路枢纽现状分析和规划线路研究的基础上,为实现宁夏自治区“五市同城化”动力集中型列车直通的功能需求,结合近、远期运量及相关线路建设时机,统筹考虑中卫枢纽点线能力协调,研究宝中二线引入中卫铁路枢纽方案。将宝中线、太中银线以及包兰线作为整体进行综合研究,分析宝中增建二线利用既有通道和新建通道两类四个方案,推荐运输组织顺畅、投资较省的利用太中银铁路黄河桥方案;围绕宝中增建二线的运输组织,研究了双线运输及双单线运输方式,推荐运输能力适应性强、运输组织顺畅的新建线路按下行方向运行方案,最后对潘营至余丁联络线于既有太中银黄河桥出岔及施工方案进行研究,提出可实施性强、投资节省的建设方案。结合工程建设条件,对新建线路从通道选择、运输组织、工程技术等方面进行多方案研究比选,为整合枢纽内线路设备资源、优化枢纽布局及运输组织提供参考。

城郊公交线网hub站点和milk-run线路设计

为解决现有的常规公交线网设计方法没有考虑实际城郊客流需求的特殊性,造成乘客出行时间过长的问题.构建基于milk-run和hub-spoke的设计理念,且同时考虑载客能力的城郊公交线网优化模型,并提出相应的遗传算法实现模型的求解.在所提出的方法中,能够得到hub站点的数量及具体位置、milk-run线路的结构、和车辆分配方案.不同于常规公交线路运营方式,所提出的城郊公交线网通过milk-run线路将分散的客流聚集到各线路的hub站点,从而形成大客流的规模效应,到达hub站点的大客流可以通过直达线路从hub站点到达相应的目的地,以此减少乘客总的出行时间.最后,为验证所提出的方法的有效性,将其应用到位于香港天水围的实际城郊公交线网中,并对比了优化后的公交服务和现有的公交服务水平.对比结果表明:在现有的公交车辆配置数量不变的条件下,所提出的方法,可以减少16.26%总的乘客出行时间,说明所提出的方法能够有效提高现有公交服务水平,增加乘客出行满意度,吸引更多乘客采用公交出行,减少交通拥堵.

Regional container transportation system for Northeast Asia economic cooperation in the 21^(st) century

In this paper, the roles of infrastructure development and transportation coordination for Northeast Asian economic cooperation are discussed. It would be necessary to establish an efficient transportation network as soon as possible. 'Hub-and-Spoke'transportation system and China-Korean peninsula railway container transportation system might be more significant for regional economic cooperation.

Optimization Model of Regional Comprehensive Freight Hub Location

An optimization model for the regional comprehensive freight hub location problem was built up from the viewpoint of the minimum cost of freight system. The construction method for regional comprehensive intermodal freight network was put forward, and three constraints of the reasonable and feasible path of the intermodal transport, i. e. , reasonable sequence, reasonable freight distance, and reasonable conversion times, were proposed according to the general concepts of the intermodal freight. Then the method for solving the model was given based on the super network and genetic algorithm. Finally, the model and the solution were verified by case study.

Bus coordination holding control for transit hubs under APTS

To increase the passenger transferring efficiency, the bus coordination holding control for transit hubs, which is as an important dynamic dispatching method for improving the service level of transit hubs, was studied in the framework of bus coordination dispatching mode. Firstly, the bus coordination holding control flow was studied based on Advanced Public Transportation Systems (APTS) environment. Then a control model was presented to optimize the bus vehicle holding time, and a genetic algorithm was designed as the solving method. In the end, an example was given to illustrate the effectiveness of the control strategy and the algorithm.

西安市幸福路跨陇海铁路总体方案研究

随着城市发展以及对中心区域的提质优化,那些在中心城区中存在的特别难以优化提升且制约因素较多的断头路,近些年来越来越引起相关职能部门及领导的重视。本文通过对交通瓶颈区域的建设空间进行调查,分析总结了通道限制因素,以提高区域交通效率、均衡路网流量、增强交通服务功能等为目标,通过系统性地对交通状况进行分析,优化立交节点方案,强化通道的可实施性,以期为今后类似通道项目设计提供技术参考。

低碳驱动下粮食转运枢纽选址及路径优化研究

为降低粮食运输的碳排放量,提高粮食运输效率,保障粮食运输安全,从定量分析的角度,构建低碳驱动下粮食转运枢纽选址-路径优化模型,并设计改进遗传算法对该模型求解,对中国现有粮食运输网络布局进行改进和优化,并选取粮食物流重点线路上的部分省会城市进行分析验证。结果表明:研究构建的轴辐式多式联运网络枢纽节点选址-路径优化模型及算法,可使粮食运输总成本降低13.87%,碳排放量降低11.70%,枢纽的平均转运饱和度提升9.66%。该方法适用于实际粮食运输过程,可实现粮食低碳高效运输,为低碳驱动下中国粮食转运枢纽选址及路径规划提供参考。

“一带一路”视角下甘肃交通枢纽的发展思路和策略

从全球贸易新格局和国内国际双循环角度分析“一带一路”给甘肃带来新要求的基础上,剖析甘肃交通枢纽发展的基础条件,明确甘肃枢纽定位,提出强化枢纽聚能、发挥枢纽辐射带动效应,构筑对外通道、实现对外快速通达,提升对外运输服务水平、打造对外开放平台,拓展枢纽服务功能、打造枢纽经济的甘肃交通枢纽发展策略,助力甘肃打造“一带一路”枢纽高地。

基于网络点评的铁路综合交通枢纽服务评价研究

为探讨铁路综合交通枢纽使用现状,提出以网络点评作为数据来源,并基于乘客满意度展开其服务评价研究。将北京西站作为研究对象,对其网络点评数据进行编码处理和语义分析,从3方面剖析北京西站使用现状:①乘客对北京西站的关注度与满意度;②乘客行为与各个空间的关联度程度;③接驳交通、功能空间、商业、设施方面存在的问题。结果表明:北京西站整体乘车体验较好,但存在商业类型单一、慢行系统建设不充分、城市功能较弱等问题。研究展示了利用网络点评数据进行铁路综合交通枢纽使用评价研究的优势,从而为枢纽的建设或更新提供实证基础以及研究思路。

中部地区综合交通枢纽建设成效及高质量发展对策研究

促进中部地区崛起提出20年来,中部地区综合交通枢纽建设取得重要成就,综合交通枢纽战略定位持续巩固,交通基础设施绿色化、智能化水平不断提升,交通基础设施综合效益不断释放。与此同时,中部地区综合交通枢纽发展的区域不平衡性、枢纽能级辐射力弱、枢纽经济发展滞后等问题愈发凸显。在更高起点上扎实推进中部地区崛起需要持续完善“三基地一枢纽”功能定位,积极构建中部地区大通道格局,打造全国枢纽经济发展先行区,提升内陆口岸开放能级,以交通运输新质生产力支撑中部地区综合交通枢纽高质量发展。

高铁枢纽与城市轨道交通换乘流线仿真与优化

针对高铁枢纽与城市轨道交通换乘流线优化问题,以南京南站作为研究对象,建立全过程仿真模型,识别换乘瓶颈,采用梯度提升决策树法(Gradient Boosting Decision Tree,GBDT)确定参数重要度,提出改善方案.首先,分解换乘过程的行人与设施流线,分析高速铁路到达客流与城市轨道交通客流的分布特征.其次,使用AnyLogic软件建立高铁枢纽换乘城市轨道交通的全过程仿真模型,分析现状仿真结果,识别空间瓶颈.然后,设计不同优化类型下的措施参数及调整范围,形成不同参数组合方案.采取梯度提升决策树算法,识别不同措施参数的相对重要度,并据此确定改善措施的优先级.最后,依据措施的优先级,确定不同类型下的优化组合方案,选择机器学习全局可解释性方法对其进行优化效果分析,为不同场景下的服务改善提出建议.研究结果表明:换乘瓶颈主要集中于楼/扶梯通道设施以及闸机、售检票机等服务设施处;乘客换乘城轨的购票比例对平均换乘时间和单位时间最大换乘人数均起到重要影响,对于平均换乘时间,城轨自动售票机数量、购票时间、城轨进站服务时间、城轨进站闸机数量的影响相对较大,对于单位时间最大换乘人数,购票时间与城轨进站闸机服务时间的影响相对较大.为提高高铁枢纽换乘效率,建议推广电子客票和多种支付方式,优化购票及检票设施.

关于打通铁路网运输能力堵点对策探究

国铁企业落实党中央部署要求并加快推进铁路货运市场化改革,采取有效措施尽快打通铁路网运输能力堵点,有效降低物流成本。通过分析路网总体规模、旅客运输供给能力、货物运输保障能力等铁路网运输能力现状,剖析铁路网运输能力堵点及成因。在此基础上,提出加强铁路网运输能力经验借鉴,探析打通铁路网运输能力堵点对策,即:畅通普速干线通道,加强煤运通道能力保障,强化中欧班列通道能力,完善港口铁路通过能力,增强西部陆海新通道线路能力,完善枢纽点线配套能力,强化铁路货运设施设备卸车能力等方面,在助力降低全社会物流成本中发挥“火车头”的重要作用。

基于不同动力集装箱船的支线运输综合调度优化

在“双碳减排”战略和绿色航运背景下,为了对使用不同动力集装箱船的支线运输进行调度优化,以LNG动力船和燃油动力船为例,引入模糊时间窗刻画货主满意度,同时考虑支线船舶运输容量、港口限制时间等实际约束条件,综合考虑运输成本、货主满意度和碳排放量,构建了一种基于不同动力船型的混合整数规划模型。结合问题特征设计混合遗传算法进行求解,通过引入局部搜索策略提高求解质量,测试算例表明设计的混合遗传算法与最优解的平均误差为1.4%,案例计算结果表明:与遗传算法相比,混合遗传算法的收敛速度和寻优能力更强,可降低运输成本29 520元,减少碳排放38.474 t。可见,基于局部搜索的混合遗传算法的求解精度明显优于传统遗传算法,说明在实际应用中该方法可以实现船舶调度优化;同时与燃油动力船相比,使用LNG动力船可以实现降低运输成本和减少碳排放的目标。