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杨平 《上海交通大学学报(英文版)》2018,23(4):515-526
The present paper presents a historical review associated with the research works on hull girder strength of ship and ship-shaped structures. Then, a new program is developed to determine the ultimate vertical bending moment of hull girder by applying direct method, stress distribution method, and progressive collapse analysis method. Six ships and ship-shaped structures used in the benchmark study of International Ship and Offshore Structures Congress (ISSC) in 2012 are adopted as examples. The calculation results by applying the developed program are analyzed and compared with the existing results. Finally, the roles of the developed program and its further development are discussed. 相似文献
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Phu Yen is a small province located in the central part of Vietnam and is suffering from a tremendous number of traffic casualties, compared with other cities in Vietnam and developed countries. Young riders take a large proportion, accounting for 47.6% in total traffic crashes. To resolve this issue, the present study aims to (i) analyze young riders' behavior and their attitudes towards traffic safety and to (ii) propose a procedure to develop a book of safe riding guidelines to reduce their involvement in dangerous situations. A set of 73 questions in the questionnaire survey have been conducted to determine the risk-taking behavior and attitude towards traffic safety of 300 individuals, who are using bicycles, e-bikes, mopeds, scooters, and motorcycles less than 150 cc. The statistical results indicate that there are significant differences among riding behavior and attitudes of respondents towards traffic safety regarding the regional factor (rural, suburb, and urban), the demographic factor (gender and age), and the travel distance factor. The guidelines designed based on the questionnaire survey are used to alter adolescents' riding behavior and attitudes and so help them recognize, avoid, and handle risks in demanding traffic situations. An analysis of the before and after the traffic safety training workshop to evaluate the effectiveness of the proposed guidelines indicated that there was a significant increment in the perceived risks of young riders after training them by using this book. 相似文献
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针对采用多状态约束卡尔曼滤波(MSCKF)的视觉惯性里程计定位精度易受特征点匹配异常值影响问题, 提出了1种基于描述符辅助光流跟踪匹配的数据关联方法。该方法采用金字塔LK光流对序列图像中特征点进行跟踪匹配, 计算每一对匹配点的rBRIEF描述符, 根据Hamming距离对描述符的相似度进行判断消除异常匹配点。在实验中从特征点匹配主观效果以及定位精度2个方面评估本文方法的有效性, 结果表明: 所提出方法能够有效滤除动态场景下图像特征匹配的异常值, 使用该方法处理后的图像进行MSCKF运动解算, 位置结果漂移率小于0.38%, 相较于未剔除异常匹配值的MSCKF算法结果, 改善了54.7%, 单帧图像处理时间约为39 ms。 相似文献
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Nguyen Thi Minh Hang Nguyen Cao Don Hiroyuki Araki Hiroyuki Yamanishi Kenichi Koga 《Journal of Marine Systems》2009,75(1-2):1-16
In this study, we present the development and application of a new ecosystem model coupled with a hydrodynamic model to describe the important physical, chemical and biological processes of an ecosystem in the marine environment, the Ariake Sea in the west coast of Kyushu, Japan. The model was calibrated and validated using in-situ field measurements from various monitoring stations in the sea. The presented results covered the period from January 1991 to December 2000. The results showed that chlorophyll-a, nutrients and dissolved oxygen levels varied seasonally in response to weather and boundary condition. Through this study, the model was shown to be able to handle the flooding and drying processes that usually exist and play an essential role over the estuarine-tidal flats of the sea. 相似文献
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This paper is a continuation of a previous paper titled ??Modeling and Model Predictive Control for Hybrid Vehicle?? published on IJAT/2011 describing a mathematical model and design for a model predictive controller for tracking speeds and simulations. The present paper further describes a fuzzy logic controller for the smooth and quick engagement of an automatic clutch. The described controller uses both fuzzy logic and slip control algorithms to enable automatic clutch engagement. Clutch engagement and comprehensive simulations for the hybrid vehicle are conducted in MATLAB R2009s. The research described herein offers theoretical solutions for how to better control clutch slip and engagement within realistic parameters used for hybrid vehicles. Algorithms and operations of this fuzzy logic controller can be implemented in electronic control units for automatic clutch engagements and gear-shifting processes. 相似文献
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Transportation - During the era of COVID-19 (COronaVIrus Disease of 2019), telework has been adopted extensively in developing countries for the first time. This study analyzes data of 355... 相似文献
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Tian Ping Li Tuan 《河北交通科技》2007,(4)
结合车辆超载,分析复合式路面的力学特性。计算不同沥青混合料面层厚度、模量、不同超载情况下复合式路面结构的综合应力、总疲劳应力以及层间剪应力。 相似文献
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Reggiani Giulia van Oijen Tim Hamedmoghadam Homayoun Daamen Winnie Vu Hai L. Hoogendoorn Serge 《Transportation》2022,49(3):897-925
Transportation - A fully separated bicycle network from vehicular traffic is not realistic even for the most bicycle-friendly cities. Thus, all around the world urban cycling entails switching... 相似文献
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