水下机器人动力定位模糊逻辑控制的虚拟现实仿真（英文）

In this paper, graphical-user-interface(GUI) software for simulation and fuzzy-logic control of a remotely operated vehicle(ROV) using MATLAB TM GUI Designing Environment is proposed. The proposed ROV’s GUI platform allows the controller such as fuzzy-logic control systems design to be compared with other controllers such as proportional-integral-derivative(PID) and sliding-mode controller(SMC) systematically and interactively. External disturbance such as sea current can be added to improve the modelling in actual underwater environment. The simulated results showed the position responses of the fuzzy-logic control exhibit reasonable performance under the sea current disturbance.     

120阀试验过程的计算机仿真——紧急阀模型及仿真结果

建立了１２０紧急阀和试验台计算仿真模型，仿真了１２０紧急阀在试验台上的试验过程，结果表明：该模型能很好的仿真１２０阀在试验台上紧急阀试验，利用模型预测了试验台管径变化对紧急阀试验性能的影响，计算发现：管径主要影响紧急灵敏度和列车管排气时间。压力表安装位置分析表明：对于气体流速较快工况，测量结果与压力表的位置相关性较大，需要慎性确定压力表位置。该工作为试验台设计、试验规范制定和１２０紧急阀性能改进提     

Smarter and more connected: Future intelligent transportation system

Emerging technologies toward a connected vehicle-infrastructure-pedestrian environment and big data have made it easier and cheaper to collect, store, analyze, use, and disseminate multi-source data. The connected environment also introduces new approaches to flexible control and management of transportation systems in real time to improve overall system performance. Given the benefits of a connected environment, it is crucial that we understand how the current intelligent transportation system could be adapted to the connected environment.     

Comparative investigation on the aerodynamic effects of combined use of underbody drag reduction devices applied to real sedan

To reduce the aerodynamic drag, the performance of the underbody aerodynamic drag reduction devices was evaluated based on the actual shape of a sedan-type vehicle. An undercover, under-fin, and side air dam were used as the underbody aerodynamic drag reduction devices. In addition, the effects of the interactions based on the combination of the aerodynamic drag reduction devices were investigated. A commercial sedan-type vehicle was selected as a reference model and its shape was modeled in detail. Aerodynamic drag was analyzed by computational fluid dynamics at a general driving speed on highway of 120 km/h. The undercover reduced the slipstream area through the attenuation of the longitudinal vortex pair by enhancing the up-wash of underflow, thereby reducing the aerodynamic drag by 8.4 %. The under-fin and side air dam showed no reduction in aerodynamic drag when they were solely attached to the actual complex shape of the underbody. Simple aggregation of the effects of aerodynamic drag reduction by the individual device did not provide the accurate performance of the combined aerodynamic drag reduction devices. An additional aerodynamic drag reduction of 2.1 % on average was obtained compared to the expected drag reduction, which was due to the synergy effect of the combination.     

迅速发展的快递业

在亚太地区的航空快递行业，联邦快递（Fedex）保持著良好的发展态势，并持续在该地区扩展设施及服务。其最新举措是在东京投资2，000万美元建设了一座货运站。[编者按]     

Multicommodity network flow model for Asia's container ports

This paper seeks to develop a multi-commodity network model to analyse the flow of containers within the Asia Pacific context. The model is used to evaluate the impact of container throughput in Asia's port by varying terminal handling charges and turnaround time. The three main regions analysed are north-east Asia, east Asia (Chinese port region) and south east Asia. Using the model, it could be shown that Busan port, which is an important transhipment hub in north-east Asia, could boost the container activities in the north-eastern part of China by improving its service quality. It is also found that the efficiency of the land link between Hong Kong and mainland China plays a crucial role for the future of Hong Kong port. While Singapore port maintains its position as a transhipment hub in south-east Asia, there would be expected competition from neighbouring low costs ports.     

Conflict Resolution through Negotiation in a Railway Open Access Market: a Multi-agent System Approach

Abstract

Open access reforms to railway regulations allow multiple train operators to provide rail services on a common infrastructure. As railway operations are now independently managed by different stakeholders, conflicts in operations may arise, and there have been attempts to derive an effective access charge regime so that these conflicts may be resolved. One approach is by direct negotiation between the infrastructure manager and the train service providers. Despite the substantial literature on the topic, few consider the benefits of employing computer simulation as an evaluation tool for railway operational activities such as access pricing. This article proposes a multi-agent system (MAS) framework for the railway open market and demonstrates its feasibility by modelling the negotiation between an infrastructure provider and a train service operator. Empirical results show that the model is capable of resolving operational conflicts according to market demand.     

The funding of hierarchical railway development in China

Transport networks are hierarchal in essence. In this paper, we explore the relationship between the financing structure and the hierarchal evolution of railway network development, using the case of China. Although privatization and corporatization in transport provision have been trends in some parts of the world, the national government is still the main body responsible for railway development in many countries. Among these countries, China and India are the only two that include the Ministry of Railways (MOR). In India, the entire country's railways are clearly defined as public services provided and managed by the MOR. In China, railways have been corporatized; yet, the MOR and the National Railway Corporation are still widely regarded as a single body that has monopolistic power over almost all railway systems at the national and regional levels in both infrastructure development and operation.     

轻轨车辆的关键技术和发展方向

本结合国内外城市轨道车辆及走行部的结构特点,着重比较了动力转向架牵引电机的布置及悬挂方式的各种特征和性能差异;介绍了轻轨车辆的走行、牵引、制动装置和电气系统,提出了新型城市轻轨车辆的主要发展方向。     

粤海铁路轮渡运营管理建议

我国第一条跨海铁路于去年12月5日开通旅客列车，至此，到海南岛的旅客除了乘飞机、汽车外，又多了一种出行选择，可以乘坐火车观赏海上风光；这趟“夕发朝至”快速旅客列车的开行结束了海南岛与大陆不通旅客列车的历史，并将进一步促进海南旅游市场迅速发展和壮大．形成了以火车带动旅游产业的经济增长新这点。[编者按]