昨日的爱好 今朝的事业——帅西和润东动力的故事

润东动力的门口停放着两辆时髦的跑车，流线的造型．硕大的轮彀，碗口粗的排气筒都昭示着这两台车澎湃的动力。而这两台车的主人，就是我们今天采访的主角帅西。[编者按]     

基于竞争循环双Q网络的自适应交通信号控制

为了更加有效且可靠地自适应协调交通流量,以减少车辆的停车等待时间为目标,提出了3DRQN(Dueling Double Deep Recurrent Q Network)算法对交通信号进行控制。算法基于深度Q网络,利用竞争架构、双Q网络和目标网络提高算法的学习性能;引入了LSTM网络编码历史状态信息,减少算法对当前时刻状态信息的依赖,使算法具有更强的鲁棒性。同时,针对实际应用中定位精度不高、车辆等待时间难以获取等问题,设计了低分辨率的状态空间和基于车流压力的奖励函数。基于SUMO建立交叉口的交通流模型,使用湖北省赤壁市交叉口收集的车流数据进行测试,并与韦伯斯特固定配时的策略、全感应式的信号控制策略和基于3DQN(Dueling Double Deep Q Network)的自适应控制策略进行比较。结果表明:所提出的3DRQN算法相较上述3种方法的车辆平均等待时间减少了25%以上。同时,在不同车流量及左转比例的场景中,随着左转比例和车流量的增大,3DRQN算法的车辆平均等待时间会有明显上升,但仍能保持较好效果,在车流量为1 800 pcu·h^-1、左转比例为50%的场景下,3DRQN算法的车辆平均等待时间相比3DQN算法减少约15%,相比感应式方法减少约24%,相比固定时长的方法减少约33%。在车流激增、道路通行受限、传感器失效等特殊场景下,该算法具有良好的适应性,即使在传感器50%失效的极端场景下,也优于固定时长的策略10%以上。表明3DRQN算法具有良好的控制效果,能有效减少车辆的停车等待时间,且具有较好的鲁棒性。     

A review of issues in transit economics

This paper reviews the development of thought on the major issues in transit economics over the last 50 years, in developed and developing countries. Some issues - the analysis of cost and demand parameters - are perennial, with development mostly in the mathematical sophistication of analytical techniques employed, while others - such as issues of ownership and competitive form - reflect wider trends in economic thinking. Some issues - such as the relationship between transit and development - are universal, while others - such as the role of small vehicles and the informal sector - impact mostly on developing countries. One conclusion stands out. Transit is critical to the achievement of a wide range of social, economic and environmental objectives and, therefore, needs appropriate institutions to ensure its integration with the strategic management of the rest of urban development policy.     

了解ASE

在过去的30年里,美国汽车维修资格认证协会(ASE)的认证书从众多有关汽车保养维修资格的认证书中脱颖而出,成为最具有影响力的资格认证书。今天,有超过42万名从业人员被ASE认定为专业技术人员。通过本文,我们可以详细了解到美国汽车维修优秀资格认证考试的历史背景、试题的编写原则及效果评估。     

就地热再生技术在重载高速公路养护工程中的应用研究

以沪杭甬高速杭州段为依托对就地热再生技术在重载高速公路养护工程中的应用进行了研究,工程应用表明热再生技术在重载高速公路养护工程中的应用效果比较理想,可在重载高速公路中推广运用。     

Improvement in capacity factor and fatigue assessment of VLMOS for wind power generation based on navigation simulation

The very large mobile offshore structure (VLMOS) for wind power generation is one example of challenging future technologies to create a new backbone of energy resource of our country. The National Institute for Environmental Studies Japan has been studying this concept and found that increasing the capacity factor and reducing the weight of the structure are keys to make this concept successful. We investigated the navigation logic to improve the capacity factor and performed a fatigue assessment to ensure the structural safety of light weight design. Taking the knowledge on the seasonal weather condition in the Pacific Ocean into consideration, improved strategy of the VLMOS navigation for maximizing the generating power is proposed. Navigation simulations show that it is easy to achieve more than 40% capacity factor and to escape from high seas. Using wind and wave data obtained from the navigation simulations, an assessment of the fatigue damage has been performed. It is stated that the structure has enough fatigue strength for a 100 years of operation even if wind turbines get more than 40% of the capacity factor.     

刺桐基督教石刻图像研究

福建泉州拥有众多蒙元时期的带有题铭与丰富图像的基督教石刻,这些石刻是洞察蒙元时期南中国所发生的文化适应过程的独特资料。通过对泉州石刻上的的图像如十字架与飞天进行考察,以及与中亚、南印度等地出土的相似物的比较研究,可知泉州基督教团体不是简单地适应当地文化,而是选择周边文化的某些元素,并使它们与基督教的教旨与释义相适应,从而创造出一种糅合基督教、佛教和蒙古元素的特殊图像,这种融多元文化而成的宗教石刻艺术在当时是前所未有的。     

新型消防用水下搜救机器人研发设计

介绍了一种消防用水下搜救机器人的设计,该水下机器人具有价格低廉、功能齐全、实用可靠和操作简便的特点,可完成水下多自由度方向运动、水下定位,不同目标的可视化探测和成像识别等作业。本文完成了消防用水下机器人的总布置设计,设计了电子舱的结构并对其进行了强度校核,评估了机器人水下稳定性,设计和论证了机器人的推进系统。     

Development of a computer-aided process planning system based on a knowledge base

 Process planning for a hull structure defines the assembly sequence of the hull block. Although this activity is very important because the working strategy defines the production costs, to date it has been done manually. To raise the efficiency of this process, we developed a practical computer-aided process planning system. It has been developed using deliverables obtained from advanced computer integrated manufacturing system (CIM; ACIM) for shipbuilding projects sponsored by the Ship and Ocean Foundation (SOF). The system has a knowledge base which contains the know-how of skilled designers as well as design practices, and allows the assembly sequence of hull parts and intermediate products to be defined automatically. The system has been integrated with the shipyard CAD system MATES, and put to practical use. Received: August 19, 2002 / Accepted: November 25, 2002 Address correspondence to: Y. Sasaki (yuuichi_sasaki@mhi.co.jp) Updated from the Japanese original, which won the 2002 SNAJ prize (J Soc Nav Archit Jpn 2001;189:309–315)     

柳州红光大桥钢桥面SMA混合料铺装质量控制要点

该文介绍了柳州红光大桥钢桥面的铺装方案以及施工中的质量控制措施,并对钢桥面铺装的方法进行了探讨。