An integrated Bayesian approach for passenger flow assignment in metro networks

This paper proposes an integrated Bayesian statistical inference framework to characterize passenger flow assignment model in a complex metro network. In doing so, we combine network cost attribute estimation and passenger route choice modeling using Bayesian inference. We build the posterior density by taking the likelihood of observing passenger travel times provided by smart card data and our prior knowledge about the studied metro network. Given the high-dimensional nature of parameters in this framework, we apply the variable-at-a-time Metropolis sampling algorithm to estimate the mean and Bayesian confidence interval for each parameter in turn. As a numerical example, this integrated approach is applied on the metro network in Singapore. Our result shows that link travel time exhibits a considerable coefficient of variation about 0.17, suggesting that travel time reliability is of high importance to metro operation. The estimation of route choice parameters conforms with previous survey-based studies, showing that the disutility of transfer time is about twice of that of in-vehicle travel time in Singapore metro system.     

路用改性沥青制作中加热方式和工序过程的优化

改性沥青制作的整个过程伴随着材料的加热，对加热方式和工艺过程进行必要的分析优化，不仅可为设备的设计和选型提供理论数据，而且对提高改性沥青的制作质量具有重要意义。     

智慧公交为疫情防控时期的公共出行保驾护航

本文以新冠肺炎疫情防控为例,将国内疫情及其防控分为疫情突发时期,遏制疫情流行时期,防疫精准化、动态化、常态化时期三个阶段,并通过回顾性研究方法评述重大突发公共卫生事件影响下城市地面公共交通的信息化防控策略,分析公交防疫措施在智慧感知层、交换共享层、应用服务层存在的不足,提出了基于多元融合感知技术、加速自动驾驶场景应用、创新数据共享融通机制,持续深入推广大数据示范应用以及优化定制公交线路,丰富突发公共事件下交通行业应急策略体系的建议。     

Basic studies on accuracy management systems based on estimating welding deformations

Accuracy management concerns various aspects of all assembly industries, e.g., final product quality, manufacturing efficiency, and manufacturing costs. In the near future, accuracy management will be even more important in manufacturing systems because of mechanization and automation. This paper considers the concept of computer-aided accuracy management systems, which are based on the concept of integrated manufacturing systems. We propose two management systems, accuracy planning and accuracy estimation, and concentrate on accuracy planning. A model of welding deformations and an easy estimation method for such deformations by computer analysis using the finite element method (FEM) are described. A prototype system based on the accuracy management concept was implemented in the authors' integrated manufacturing systems, and some examples of estimating welding deformations are given here. Translation of an article that appeared in the Journal of The Society of Naval Architects of Japan, vol. 181 (1997): The original article won the SNAJ prize, which is awarded annually to the best papers selected from the SNAJ Journal, JMST, or other quality journals in the field of naval architecture and ocean engineering.     

"互联网+"背景下我院"汽车制造工艺技术"课程教学模式改革与实践

文章结合我院课程改革实际,就"汽车制造工艺技术"课程过去存在的"灌输式"教学模式,研究"互联网+"背景下利用网络学习与教学平台,建立"课内与课外、线下与线上、现实与虚拟"的混合式教学新模式。与采用传统教学模式相比,采用"互联网+"混合式教学模式,学生的课堂活跃程度,学习主动性、成绩提高有明显优势。     

铁路通信信号制造企业供应链管理

从供应链管理基本思想出发,对铁路通信信号设备制造企业面临的问题进行简要阐述,提出企业供应链管理的策略,认为企业逐步实施供应链管理既能满足IRIS标准要求,又能提升企业管理水平和核心竞争力。     

建设资源节约型、环境友好型绿色船舶工业

国家"十一五"规划明确提出了全面贯彻落实科学发展观,建设资源节约型、环境友好型社会的战略目标。据此提出了建设资源节约型、环境友好型绿色船舶工业的设想,并就如何建设绿色船舶工业从设计、工艺、管理模式等方面提出了相应的建议,供业内人士共同探讨。     

基于关键链方法的船舶分段制造计划系统研究

船舶分段制造计划系统是一个多任务的管理系统，周期相当长而且有着相当大的不确定性。该文建立了船舶分段制造计划系统管理框架，运用关键链技术分析和优化了船体分段计划系统。介绍了运用关键链方法后，对船舶分段制造采用工艺改进和管理措施改进所取得的效果，并对关键链方法未来的发展前景进行了展望。     

基于闭环控制原理的地铁车辆监造过程中质量控制研究

闭环控制系统通过反馈环节将输出与输入比较,从而获得最优输出结果。将这一方法应用于地铁车辆监造过程质量控制中,并通过实际项目的应用,验证了该方法的可行性、实用性和可推广性。     

制造网格门户的设计

网格门户是网格环境的用户接入点，是允许用户通过传统的Web浏览器或其他桌面工具编写、访问和执行分布式的网格应用程序的一个问题解决环境。介绍了制造网格，分析了制造网格的特点，以及由此产生的制造网格的特殊需求，并设计出制造网格门户的基本框架。