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SECOND ORDER APPROXIMATION SOLUTION OF NONLINEAR LARGE DEFLECTION PROBLEMS OF YONGJIANG RAILWAY BRIDGE IN NINGBO

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Applied Mathematics and Mechanics(English Edition) 2002年第5期23卷 493-506页

作者： chien wei-zang(钱伟长) Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 P R China

The solution and computational aspects on nonlinear deflection of Yongjiang Railway Bridge in Ningbo were investigated. An approximate iteration algorithm on nonlinear governing equation was presented, and the obtained results show that, if altitude difference and span of the riverbanks are taken as 5 meters and 100 meters, respectively, the maximum gradient in the middle of the bridge exceeds 5%, much larger than maximum allowance gradient in railway design code. Therefore, a new solution scheme for decreasing gradient of the bridge is put forward, that is, the altitude difference between two riverbanks can be decreased to about 1/10 of the initial magnitude by building roadbeds with 0.5% gradient and 1 kilometer length at two riverbanks. As a direct result, the deflection gradient of the railway bridge is much reduced and the value is between 0.5% similar to 0.6%.

关键词： large deflection elastic modulus cantilever beam

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汉字宏观字形编码(钱码)

计算机工程 1986年第5期 1-8页

作者：钱伟长曹家麟邹皓冯麒孙上海工业大学

钱码是一种简单易学、通俗易懂的新颖计算机汉字输入法。本方案根据人们长期使用汉字的习惯及普遍接受的识字规律,并结合汉字结构的特点,提出将一个汉字以其宏观的字形结构进行编码,使编码方法尽可能与人们的识字规律相吻合。这在编码... 详细信息

钱码是一种简单易学、通俗易懂的新颖计算机汉字输入法。本方案根据人们长期使用汉字的习惯及普遍接受的识字规律,并结合汉字结构的特点,提出将一个汉字以其宏观的字形结构进行编码,使编码方法尽可能与人们的识字规律相吻合。这在编码方法上是全新的,并且有编码规则简洁,逻辑性强,易学好记,便于使用和推广等特点。在钱码方案中,任何一个复杂汉字(简体、繁体)均只需输入三码,因而输入速度快,使用效率高。 1.在大量实践及统计的基础上,精取了若干基本部件。 2.切合识字心理规律,变革基本部件归类方法——采用宏观归类新法。 3.编码规则注重逻辑性,严密性,简易性。 4.发挥计算机软件特长,使用开发工具进行编码优化,并在操作系统中增加了编码辅助输入,拼音,钱码交叉检索,重码记忆,词汇输入及增删,造字,编辑和排版等功能。 5.适用于 IBM——PC/XT/AT,IBM-5550,长城-0520及其兼容的微型计算机,以及WANG(王安)-PC微机。

关键词：编码方案 DOS 基本部件归类方法编码规则逻辑性计算机软件软件基本笔画 IBM 字形编码识字规律编码方法 MPC

Finite Element Analysis of Axisymmetric Elastic Body Problems

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Applied Mathematics and Mechanics(English Edition) 1980年第1期1卷 23-34页

作者： chien, wei-zang(Tsing Hua University, Peking) Tsing Hua University Peking

Linear form functions are commonly used in a long time for a toroidal volume element swept bya triangle revolved about the symmetrical axis for general axisymmetrical stress *** is diffi-cult to obtain the rigidity matrix by exact integration,and instead,the method of approximate in-tegration is *** the locations of element close to the symmetrical axis,the accuracy of this ap-proximation deteriorates very *** exact integration have been suggested by various authorsfor the calculation of rigidity ***,it is shown in this paper that these exact integrationscan only be used for those axisymmetric bodies With central *** solid axisymmetric body,itcan be proved that the calculation fails due to the divergent property of rigidity matrix *** this paper a new form function is *** this new form function,the radial displacementu vanishes as radial coordinates r approach to *** calculated rigidity matrix is convergenteverywhere,including these triangular

关键词： Finite Element Analysis of Axisymmetric Elastic Body Problems

ASSUMPTIONS IN SAINT-VENANTS SOLUTION FOR THE TORSION OF AN ELASTIC CYLINDER

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Science in China,Ser.A 1954年第2期 165-170页

作者： chien wei-zang Tsing Hua University

Saint-Venant used a set of physical assumptions in his semi-inversemethod for the torsion of an elastic cyclinder. These assumptions areequivalent to the following four conditions: σx =σy=τxy=σz=0. （1） Later researches by A. Clebsch and W. Voigt have resulted insimplifications of Saint-Venant’s analysis. Clebsch showed that the assumptionthat σz=0 is really not necessary. Instead of （1）, the following three assump-tions are sufficient for Saint-Venant’s solution:

关键词： ASSUMPTIONS IN SAINT-VENANTS SOLUTION FOR THE TORSION OF AN ELASTIC CYLINDER

Modeling of turbulent,isothermal and cryogenic cavitation under attached conditions

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Acta Mechanica Sinica 2010年第3期26卷 325-353页

作者： chien-Chou Tseng Yingjie wei GuoyuWang wei Shyy Department of Mechanical Engineering University of Michigan2350 Hayward Ann Arbor MI 48109 USA School of Astronautics Harbin Institute of Technology 92 West Da-Zhi Street Harbin 150001 China School of Vehicle and Transportation Engineering Beijing Institute of Technology 5 South Zhongguancun Street Beijing 100081 China Department of Aerospace Engineering University of Michigan 1320 Beal Ann Arbor MI 48109 USA

Cavitation is often triggered when the fluid pres- sure is lower than the vapor pressure at a local thermo- dynamic state. The present article reviews recent progress made toward developing modeling and computational strat- egies for cavitation predictions under both isothermal and cryogenic conditions, with an emphasis on the attached cav- ity. The review considers alternative cavitation models along Reynolds-averaged Navier-Stokes and very lager eddy simu- lation turbulence approaches to ensure that the computational tools can handle flows of engineering interests. Observing the substantial uncertainties associated with both modeling and experimental information, surrogate modeling strategies are reviewed to assess the implications and relative impor- tance of the various modeling and materials parameters. The exchange between static and dynamic pressures under the influence of the viscous effects can have a noticeable impact on the effective shape of a solid object, which can impact the cavitation structure. The thermal effect with respect to evaporation and condensation dynamics is examined to shed light on the fluid physics associated with cryogenic cav- itation. The surrogate modeling techniques are highlighted in the context of modeling sensitivity assessment. Keywords

关键词： Cavitation Cryogenic liquidThermal effects Turbulence model - Surrogate model

CONTINUOUS BEAMS WITH NON-UNIFORM STIFFNESS~*

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Science in China,Ser.A 1953年第2期 116-126页

作者： chien wei-zang (Tsing HUniversity)

In this paper, the method of continued fraction is used for the determination of bending moments of a continuous beam with non-uniform stiffness. Let us first consider a continuous beam supported on n+1 supports and

关键词： CONTINUOUS BEAMS WITH NON-UNIFORM STIFFNESS

FIXED POINTS ON TWO COMPLETE AND COMPACT METRIC SPACES

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Applied Mathematics and Mechanics(English Edition) 2001年第5期22卷 564-568页

作者： M. Telci (Department of Mathematics, Faculty of Arts and Science, Trakya University, 22030 Ediren, Turkey) (Communicated by chien wei_zang) Department of Mathematics Faculty of Arts and Science Trakya University Ediren Turkey

By using functions, some related fixed point theorems on two metric spaces are established. These results generalize some theorems of Fisher.

关键词： fixed point complete metric space compact metric space

A Review of Predictive and Contrastive Self-supervised Learning for Medical Images

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Machine Intelligence Research 2023年第4期20卷 483-513页

作者： wei-chien Wang Euijoon Ahn Dagan Feng Jinman Kim Biomedical and Multimedia Information Technology(BMIT)Research Group School of Computer ScienceThe University of SydneySydneyNSW2006Australia College of Science and Engineering James Cook UniversityCairnsQLD4811Australia

Over the last decade, supervised deep learning on manually annotated big data has been progressing significantly on computer vision tasks. But, the application of deep learning in medical image analysis is limited by the scarcity of high-quality annotated medical imaging data. An emerging solution is self-supervised learning (SSL), among which contrastive SSL is the most successful approach to rivalling or outperforming supervised learning. This review investigates several state-of-the-art contrastive SSL algorithms originally on natural images as well as their adaptations for medical images, and concludes by discussing recent advances, current limitations, and future directions in applying contrastive SSL in the medical domain.

关键词： Self-supervised learning(SSL) contrastive learning deep learning medical image analysis computer vision

Real-Time Human Body Motion Capturing System

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Journal of Electronic Science and Technology 2017年第2期15卷 115-122页

作者： Chung-Lin Huang chien-wei Hsu Zhi-Ren Tsai Department of M-Commerce and Multimedia Applications Asia UniversityTaichung 41354 MediaTek Inc.Hsinchu department of computer science and information engineering Asia UniversityTaichung 41354

This paper proposes a human body motion capturing system using the depth images. It consists of three processes to estimate the human pose parameters. First, we develop a pixel-based body part classifier to segment the human silhouette into different body part sub-regions and extract the primary joints. Second, we convert the distribution of the joints to the feature vector and apply the regression forest to estimate human pose parameters. Third, we apply the temporal constraints mechanism to find the best human pose parameter with the minimum estimation error. In experiments, we show that our system can operate in real-time with sufficient accuracy.

关键词： Index Terms-Motion capturing random forest classifier regression forest.