Formulating cargo inventory costs for liner shipping network design

This study examines how to incorporate the inventory costs of containerized cargoes into existing liner service planning models such that the designed networks could be improved while not causing extra modeling/computational burden. Two approaches are compared: (i) not considering the inventory costs at all and (ii) incorporating the inventory costs associated with onboard time and those related to transshipment by assuming a fixed connection time. The two models are compared with the ideal model capturing the exact inventory costs on a route choice problem and a capacity planning problem based on extensive randomly generated and practical numerical experiments. The results show that: first, ignoring the inventory costs in service planning models may lead to network design with much higher costs (poor network design decisions); second, in service planning models assuming weekly frequency, the inventory costs associated with onboard time could be formulated exactly, and those related to the connection time of weekly services could be approximated by assuming fixed connection time of 3.5 days for ports with 1 day’s minimum connection time and 4.5 days for ports with 2 days’ minimum connection time.     

Structural relationships among shipper’s perception,value, and choice intention of Korea–China train ferry service

ABSTRACT

The logistics environment between China and Korea has been changing rapidly in line with the ‘Go West’ policy of international trade and logistics area. The policy includes the BRI, Western Development Strategy, and Korea–China FTA. Against this background, the Korea–China train ferry (KCTF) is being newly illuminated as an alternative mode to cope with the logistics environment between Korea and China. One of the key success factors of the KCTF depends on, among others, shippers’ perception, which will affect the choice and the successful operation of the KCTF. From this perspective, this paper develops seven hypotheses based on the Theory of Reasoned Action (TRA) and Technology Acceptance Model (TAM). We test these hypotheses using Structural Equation Modeling (SEM) to explore the structural relationship between shippers’ behavioral beliefs influencing the perceived usefulness, the attitude toward and intention to choose the KCTF. The test results confirm that among the behavioral beliefs, transport accessibility in association with an efficient network of inland roads and railway networks is an important prerequisite. In addition, we verified a high statistical significance in the structural relationships among perceived usefulness, the attitude toward and the intention to choose the KCTF.     

Revisiting urban hierarchy and specialization from a maritime perspective

ABSTRACT

Port–city relationships have attracted paramount attention from a variety of scientific disciplines for several decades, such as geography, history, planning, regional science, sociology, and economics to name but a few. Yet, the extent to which maritime traffic specialization obeys the same spatial distribution than other economic activities remains underexplored today. This article tackles these lacunae head-on by proposing an empirical analysis of the way vessel tonnage per main categories of flows (e.g. containers, bulks, passengers) coincides with the demographic size of the world’s coastal and inland city-regions, using novel data on global inter-port vessel movements and harmonized population data over the period 1977–2008. Our main results confirm that such traffic is far from being randomly distributed, as its volume, value, and diversity concentrate at the top of the urban hierarchy. This research motivates the need to further integrate physical connectivity into the study of cities and their development mechanisms.     

Short-term prediction of vehicle waiting queue at ferry terminal based on machine learning method

Ferry service plays an important role in several cities with waterfront areas. Transportation authorities often need to forecast volumes of vehicular traffic in queues waiting to board ships at ferry terminals to ensure sufficient capacity and establish schedules that meet demand. Several previous studies have developed models for long-term vehicle queue length prediction at ferry terminals using terminal operation data. Few studies, however, have been undertaken for short-term vehicular queue length prediction. In this study, machine learning methods including the artificial neural network (ANN) and support vector machine (SVM) are applied to predict vehicle waiting queue lengths at ferry terminals. Through time series analysis, the existence of a periodic queue-length pattern is established. Hence, methodologies used in this study take into account periodic features of vehicle queue data at terminals for prediction. To further consider the cyclical characteristics of vehicle queue data at ferry terminals, a prediction approach is proposed to decompose vehicle waiting queue length into two components: a periodic part and a dynamic part. A trigonometric regression function is introduced to capture the periodic component, and the dynamic part is modeled by SVM and ANN models. Moreover, an assembly technique for combining SVM and ANN models is proposed to aggregate multiple prediction models and in turn achieve better results than could be attained from a lone predictive method. The prediction results suggest that for multi-step ahead vehicle queue length prediction at ferry terminals, the ensemble model outperforms the separate prediction models and the hybrid models, especially as prediction step size increases. This research has important practical significance to both traffic service management interests and the travelers in cities along waterfront areas.     

A survey of short sea shipping and its prospects in the USA

Purpose: based on the known in the literature difference between expected and perceived quality, this study examines the factors and the ways that influence the passenger to select a ferry operator.

Methodology/approach: the research attempts to shed some light on the importance of every selection determinant by employing multinomial logistics analysis which identify that the convenience determinant is pivotal when selecting a service.

Findings: the main findings of the study indicate that among six different combinations of factors—models—perceived service quality together with price and convenience (satisfaction determinants) best describe the choice procedure followed by the passenger. The evidence is drawn from a survey performed in the Greek coastal shipping sector.

Originality/value of the paper: to survive in a competitive market, organizations must continuously strive to understand their customers’ wants and needs. Although this is a highly recognized issue in the marketing agenda little or no research has been done on passenger satisfaction and the subsequent selection of a ferry operator.

Practical implications: by using the findings of this work, ferry operators may deeply and timely understand their customers’ purchasing behaviour and adapt their marketing policies especially in a competitive and fast-changing environment.     

基于Isight/Nastran的车渡船跳板结构优化设计

采用Patran/Nastran对车渡船跳板结构进行强度分析,在此基础上,集成Isight/Nastran对车渡船跳板结构进行优化设计。以结构质量为目标,跳板面板相当应力、跳板骨材合成应力及跳板结构位移为约束条件,重点考虑跳板面板厚度、跳板普通横梁以及跳板纵桁和强横梁的截面尺寸。最后,采用Isight中自带的多岛遗传算法(MIGA)对某渡船跳板结构进行优化,使得该跳板在最大等效应力不超过许用值的同时总质量达到最小。优化后跳板结构质量为7 368 kg,比之前的质量9 477 kg减少了22.25%,优化效果明显,且满足强度和刚度要求。     

火车/汽车客滚船结构设计

介绍了由上海船舶研究设计院设计的世界上第一艘电力推进的火车/汽车客滚船结构设计,对该船的一些特殊结构进行了有限元计算分析,解决了某些特殊结构优化设计和工艺制造技术难点,保证了该船取得优良的结构设计水平。     

Who pays the ferryman? An analysis of the ferry passenger's selection dilemma

Purpose: based on the known in the literature difference between expected and perceived quality, this study examines the factors and the ways that influence the passenger to select a ferry operator.

Methodology/approach: the research attempts to shed some light on the importance of every selection determinant by employing multinomial logistics analysis which identify that the convenience determinant is pivotal when selecting a service.

Findings: the main findings of the study indicate that among six different combinations of factors—models—perceived service quality together with price and convenience (satisfaction determinants) best describe the choice procedure followed by the passenger. The evidence is drawn from a survey performed in the Greek coastal shipping sector.

Originality/value of the paper: to survive in a competitive market, organizations must continuously strive to understand their customers' wants and needs. Although this is a highly recognized issue in the marketing agenda little or no research has been done on passenger satisfaction and the subsequent selection of a ferry operator.

Practical implications: by using the findings of this work, ferry operators may deeply and timely understand their customers' purchasing behaviour and adapt their marketing policies especially in a competitive and fast-changing environment.     

PS30水翼客船推进轴系校中若干动态因素的考虑

根据在PS30水翼船上采用理论分析及定量计算方法进行推进轴系校中时首次尝试考虑各动态因素的情况，介绍了其推进轴系的交形特点、校中的原则、变形量的计算与处理、预报的轴系校中预偏置量和实际安装值，以及在实船试航与营运中取得的令人满意的结果。     

烟大铁路轮渡项目港口工程设计创新技术应用

介绍了烟大铁路轮渡码头的特点、设计难点和关键技术,将码头作业风级从普通码头的6级风提高到8级风,运用物理模型试验确定码头波浪作业标准,理论分析和实践检测相结合确定渡船靠泊速度.     

世界高速客渡船发展趋向及其市场前景的评估

介绍并讨论了最新的高速客渡船型及其设计建造，动力装置，材料工艺，适航性和航运管理等方面的问题。     

The competitive environment of a service industry: the examples of the U.K.-Continent passenger sea ferry services

The paper examines an international service sector (passenger sea ferry services between the U.K. and continental Europe) from the perspective of its competitive environment. Porter's five forces model forms the basis of the analysis of the market illustrated by recent develoments. Within this context the barriers to entry into and exit from the market are considered in detail. Recently, there have been many changes in market structure, and with increased competition, including that from the Channel Tunnel, it may be necessary to pool services. This will improve ferry competition with other forms of transport, but will require the brand awareness of ferries to shift from the ferry company to the ferry service offer. The service offer will need to be more clearly defined.     

基于人工神经网络的船舶油耗模型

针对船舶能效管理计划SEEMP的实施需求,寻求建立油耗模型的通用方法,为航行优化提供决策基础。以丹麦籍客滚轮MS Smyril号作为研究案例,对船舶实测运行数据进行了分析和预处理,并采用人工神经网络构建了船舶油耗和航速的黑箱模型。基于实测数据与模型预测数据的对比,验证了上述油耗模型的准确性和实用性,对于提高船舶能效运行指数EEOI具有重要意义。     

SWATH交通艇方案设计及其稳性分析

在简单介绍SWATH交通艇初步设计的基础上,对其稳性进行分析,并根据规范做了校核.     

巴哈马车客渡船设计简介

本船作为车客渡船具有多用途、多任务的特点,适应性强.该文从型线设计、总体布置、稳性计算等方面,概要介绍了本船的一些设计特点.     

烟大铁路轮渡渡船主柴油机选型分析

烟大铁路轮渡项目是我国沿海铁路通道的重要组成部分.渡船为我国首次采用电力推进的滚装船铁路轮,柴油发电机组是渡船动力装置的核心.它的选型关系到船舶的初投资和营运的经济性.本文简述了柴油机选型原则、渡船电站功率的计算、渡船柴油机装配功计算、渡船柴油机选配方案.通过柴油机装机功率选配方案分析比较,渡船柴油机装机功率按12000kW方案选择是合理的.     

基于IGA-BP算法的船舶航向智能自适应控制系统设计

在深入研究基于BP学习算法的前向神经网络以及模糊神经网络控制器的基础上,针对模糊神经网络控制器难以设计以及传统BP学习算法易于陷入局部收敛的不足,结合免疫遗传算法的全局收敛特性以及BP学习算法局部收敛的快速性,提出了一种基于混合计算智能方法的IGA-BP算法的神经网络参数的优化设计方法.将设计的控制器用于建立船舶航向控制系统模型,仿真结果表明,在船舶无干扰和存在随机干扰的情况下,基于IGA-BP算法设计的船舶航向控制系统均能使船舶转向控制无超调,跟踪快,比BP学习算法的控制效果更理想.     

基于航行数据的船舶油耗优化

以一条丹麦籍客滚轮的实测数据为基础,通过人工神经网络建立案例船的油耗黑箱模型。基于该油耗模型,进一步采用动态规划算法获得规定航线上的最佳航行策略,有效提高案例船的EEOI能效指数,达到减排节能的目标。该项研究所建立的油耗优化系统框架完全以实测航行数据为基础,可以直接应用于不同船只,具有较普遍的适用性,对于SEEMP能效管理计划的实施具有重要意义。     

"莱长01"沿海汽车渡船设计

本文介绍一艘单向推进、车辆可首、尾双向上落码头的沿海汽车渡船设计。其阻力性能优于双向推进船型而又保持了双向推进船型车辆快速上落的优点;借助首侧推的操作,船舶离靠码头方便。     

“菜长01”沿海汽车渡船设计

本文介绍一艘单向推进、车辆可首、尾双向上落码头的沿海汽车渡船设计。其阻力性能优于双向推进船型而又保持了双向推进船型车辆快速上落的优点；借助首侧推的操作，船舶离靠码头方便。