NONMONOTONIC TRUTH MAINTENANCE SYSTEMS

ＮＯＮＭＯＮＯＴＯＮＩＣＴＲＵＴＨＭＡＩＮＴＥＮＡＮＣＥＳＹＳＴＥＭＳ＊ＹａｎｇＪｉｅＳｈｉＰｅｎｇｆｅｉ（ＩｎｓｔｉｔｕｔｅｏｆＩｍａｇｅＰｒｏｃｅｓｓｉｎｇａｎｄＰａｔｅｒｎＲｅｃｏｇｎｉｔｉｏｎ）ＡｂｓｔｒａｃｔＴｒｕｔｈｍａｉｎｔｅｎａｎｃｅ...     

一种船舶作业中原始数据质量的实用评估方法（英文）

With the current revolution in Shipping 4.0, a tremendous amount of data is accumulated during vessel operations. Data quality(DQ) is becoming more and more important for the further digitalization and effective decision-making in shipping industry. In this study, a practical DQ assessment method for raw data in vessel operations is proposed. In this method, specific data categories and data dimensions are developed based on engineering practice and existing literature. Concrete validation rules...     

Classification of underwater still objects based on multi-field features and SVM

A Support Vector Machine is used as a classifier to the automatic detection and recognition of underwater still objects. Discrimination between the objects can be transferred into different projection spaces by the process of multi-field feature extraction. The multi-field feature vector includes time-domain, spectral, time-frequency distribution and bi-spectral features. Underwater target recognition can be considered as a problem of small sample recognition. SVM algorithm is appropriate to this kind of problems because of its outstanding generalizability. The SVM is contrasted with a Gaussian classifier and a k-nearest classifier in some experiments using real data of lake or sea trial. The experimental results indicate that SVM is better than the others two.     

城市轨道交通战略研究有关问题探讨

从轨道交通线网规划战略研究主要内容出发,采取问题导向性研究思路,重点对目前战略研究中较为薄弱的宏观需求分析、边界条件、发展模式选择三方面进行分析,认为目前在线网规划阶段,用于判断轨道交通战略的宏观需求分析较为薄弱,缺乏对宏观需求特性尤其是主要走廊交通瓶颈的分析;另外,容易在战略研究时忽略重要的边界条件,导致制定出来的战略乃至线网方案不具有可实施性和可操作性;同时在战略研究过程中对于轨道交通发展模式的把握较为死板,不能做到因地制宜地选择模式和构建网络层次。针对战略研究阶段这些问题的分析并结合相关案例提出其研究重点和内容,如宏观需求特征把握需要关注的内容,边界条件需要关注的地质、文物等内容,发展模式选择所需要结合的城市规模和形态等内容。     

城轨交通建设规划相关问题研究及对策建议

结合多年来城轨交通建设规划编制与评估的经验,分析目前建设规划中存在的问题,如线网规划不稳定,编制内容、深度、研究重点有待进一步提高,配套专题研究不足等。提出具体的优化和改进建议,从建设规划角度对线网规划提出明确要求,界定研究深度,并对技术难点提出相应的措施建议。同时,明确建设规划的目标要求和关注重点,重视轨道交通配套专题研究的重要性,提出同步开展的强制性和深度要求,是稳定方案、控制投资、提高功能效果的重要保障。     

黄土隧道掘进时地面隆起原因探讨

对四座黄土铁路隧道的浅埋地段，在掘进时洞顶地面有隆起、回落，最后下沉的现象，通过围岩压力计算分析，并结合黄土与黄土窑洞特性进行探讨，提出地面隆起原因。     

A NEW METHOD FOR DIAGRAMMING PACEMAKER/HEART INTERACTION

ＰａｃｅｄｅｌｅｃｔｒｏｃａｒｄｉｏｇｒａｍｉｓａｎｅｗｂｒａｎｃｈｏｆＥＣＧ,ｗｈｉｃｈｉｓａｎｅｆｅｃｔｉｖｅｔｏｏｌｉｎｅｖａｌｕａｔｉｎｇｔｈｅｐａｃｅｍａｋｅｒｓｂｅｈａｖｉｏｒ．Ａｄｖａｎｃｅｍｅｎｔｓｉｎｔｅｃｈｎｏｌｏｇｙｈａｖｅｍａ...     

AN EFFICIENT RF COIL FOR GENERATING A CIRCULAR POLARIZED MAGNETIC FIELD

1IntroductionThecreationoftheprincipleofmagneticresonanceimage(MRI)iscreditedtoP.C.Lauterburwhoachivedthefirstimageinl973-It'hasbeendemonstratedthatMRIisabletopro-videthehumanbody'simagewithhighspatialresolutionandhighsensitivitytopathologicalchanges.TheRFcoilisusedtoproduceanddetectradiofrequency(RF)magneticfieldB,.IntheMRIsystemnuclearmagneticresonanceisexcit-edinabodytobeimagedbyapplyingtothebodyanRFmagneticfieldB,perpendiculartoarelativelystrongstaticmagneticfieldB,'IftheRFstreng…     

“漫海”号散货船槽型舱壁有限元力学分析

本文应用ＡＬＧＯＲ ＦＥＡＳ（Ｓｕｐｅｒ ＳＡＰ）程序分析了“漫海”散货船槽型舱壁的承载能力。通过变化板厚、载荷状况,对舱壁模型进行了强度计算,得到补板板厚、板高与壁最大应力、最大线位移及其位置的变化关系曲线,从而为现有散货船舱壁结构方案中的补板的选择提供了参考依据。