Segment-based alteration for container liner shipping network design

Container liner shipping companies only partially alter their shipping networks to cope with the changing demand, rather than entirely redesign and change the network. In view of the practice, this paper proposes an optimal container liner shipping network alteration problem based on an interesting idea of segment, which is a sequence of legs from a head port to a tail port that are visited by the same type of ship more than once in the existing shipping network. In segment-based network alteration, the segments are intact and each port is visited by the same type of ship and from the same previous ports. As a result, the designed network needs minimum modification before implementation. A mixed-integer linear programming model with a polynomial number of variables is developed for the proposed segmented-based liner shipping network alternation problem. The developed model is applied to an Asia–Europe–Oceania liner shipping network with a total of 46 ports and 11 ship routes. Results demonstrate that the problem could be solved efficiently and the optimized network reduces the total cost of the initial network considerably.     

Batteries in offshore support vessels – Pollution,climate impact and economics

This paper assesses the pros and the cons of installing batteries on offshore support vessels. These vessels are specially designed to provide services to oil and gas operations, such as anchor handling, supply and subsea operations. They have multiple engines and advanced dynamic positioning systems to ensure that they can perform their duties with high reliability at nearly any sea state. Combined with high safety requirements, this has resulted in general operational patterns with vessels running multiple combustion engines even at calm water conditions. For emissions, low engine loads yield high emissions of exhaust gases such as nitrogen oxides (NOx) and aerosols such as black carbon (BC), due to less favorable combustion conditions. The high span for these vessels between low loads and high, and their great need for potential power at short notice, motivate our examination of hybrid setups with electric: the vessel segment should be more favorable than many. We find that combining batteries with combustion engines reduces local pollution and climate impact, while the economics with current battery cost and fuel prices is good enough for new vessels, but not good enough for retrofits.     

A tailored branch-and-price approach for a joint tramp ship routing and bunkering problem

This paper deals with a practical tramp ship routing problem while taking into account different bunker prices at different ports, which is called the joint tramp ship routing and bunkering (JSRB) problem. Given a set of cargoes to be transported and a set of ports with different bunker prices, the proposed problem determines how to route ships to carry the cargoes and the amount of bunker to purchase at each port, in order to maximize the total profit. After building an integer linear programming model for the JSRB problem, we propose a tailored branch-and-price (B&P) solution approach. The B&P approach incorporates an efficient method for obtaining the optimal bunkering policy and a novel dominance rule for detecting inefficient routing options. The B&P approach is tested with randomly generated large-scale instances derived from real-world planning problems. All of the instances can be solved efficiently. Moreover, the proposed approach for the JSRB problem outperforms the conventional sequential planning approach and can incorporate the prediction of future cargo demand to avoid making myopic decisions.     

高职高专院校大学英语课程标准设置初探

本文探讨了课程标准和教学大纲的不同,分析了高职高专学校大学英语课程标准涵盖的内容,并对其中的部分细节和操作实践提出了建议.     

基于就业导向下的航海本科英语教学改进建议

为了提高航海专业本科学生就业竞争力,在分析学生就业形势变化的基础上,指出航海英语教学改革是提高学生就业竞争力的有效途径,并提出航海英语本科教学的改进建议。     

浅谈多媒体在数学教学中的辅助作用

随着课堂教材改革的全面推行和逐步深入,教学手段的现代化已成为当前实施素质教育、提高课堂教学效率的一个重要问题。本文就这一课题谈一谈自己对多媒体辅助数学教学以及制作课件方面的一些看法。     

高职学生英语学习策略培养与差异化教学

目前高职院校的英语教学,由于教学班型大,人数多,学生基础参差不齐,学生个性差异明显,多数学生学习比较被动,以往整齐划一的教学形式难以适应新时期英语教学目标的要求。通过实施差异化教学,将语言学习策略引入高职英语教学,对有效提高高职学生英语学习的积极性及英语实际应用能力,不失为解决高职英语教学难题,加强教学的针对性和时效性的新途径。     

传感器与检测技术实验课教学改革构想

为了强化学生实践动手能力培养,全面提升应用型工程人才培养质量,本文分析了传感器与检测技术课程实践教学的现状,揭示了存在的共性问题;调查分析了不同类型高校该课程的内容体系及学时分配情况;提出了"更新实验教学内容、搭建综合实验教学平台"等改革构想。     

应用型人才培养与医学院校英语专业听力教学改革

英语听力较弱,是医学院校英语专业学生学习英语中的普遍现象,成为了学生提高英语实际应用能力的的瓶颈。本文在应用型人才培养背景下,从医学院校英语专业听力教学的现状研究入手,就英语专业听力教学中存在的典型问题进行分析,提出应对策略,旨在提高学生的听力水平和综合运用英语的能力,提高高校外语教学质量。     

高职院校思想政治理论课实践教学的研究与探索

实践教学是高职院校思想政治理论课实践育人的重要形式和载体,探索思想政治理论课实践教学的新途径和新方法,不断创新思想政治理论课的实践教学模式。适应高职院校的人才培养特点,使得思想政治教育理论课实践教学与专业教学的实践相结合,以不断提高思想政治教育理论课实践教学的针对性和实效性。