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양승용(Seung-Yong Yang),권태수(Taesoo Kwon) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Finite element analysis was conducted for the front head structure of Korean tilting train express (TTX). Crush force vs. crush length diagrams and crushed shapes due to a collision were obtained. Numerical results were investigated with respect to shear failure conditions and material rate dependencies. It was examined how results depend on the material models assumed for the simulation. It is shown that the rate dependency is related to the initial barrier of the crush force and the failure condition affects the average height of the crush force.
양승용(Seungyong Yang),차성종(Sungjong Cha) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The goal in the design of any transmission pump is to get a required flow for a minimum of input power. A simulation can be very helpful in optimizing performance. Presented here are simulations of cavitating flow in a gerotor oil pump. They were conducted using a CFD code, CFD-ACE+ with "full cavitaition model". The cavitation model accounts for important effects such as bubble dynamics, turbulent pressure fluctuations and the presence and expansion of non-condensable gases in liquid. Results in the form of plot of flow versus speed, time history of instantaneous pressure, and contours of pressure and void fraction(i.e., volume fraction of varopr and non-condensable gas) are presented. The flow results are compared with experimental data and the agreement is found to be good.
양승용 ( Seung-yong Yang ),이유진 ( Yu-jin Lee ),김영임 ( Young-im Kim ),유지경 ( Ji-keong Yu ),정노희 ( Noh-hee Jeong ) 충북대학교 산업과학기술연구소 2016 산업과학기술연구 논문집 Vol.30 No.2
Niosomes are lamellar structures, which are formed on the admixture of non-ionic surfactant of the alkyl or dialkyl polyglycerol ether group and cholesterol by thin film hydration method. We prepared collagen-encapsulated niosomes to increase the absorption rate of the collagen to the skin. In this experiment, we used polyoxyethylene sorbitan and cholesterol to prepare niosomes, and we chose fish scale collagen as encapsulating drug. To characterize of niosomes, we used particle size analyzer, UV-Vis spectrometer, scanning electron microscope. As a result, niosome size was increased with the concentration of cholesterol. Encapsulation efficiency of niosomes was different according to the content ratio of cholesterol and the kind of non-ionic surfactant. Niosome stability was excellent at 4℃.
양승용(Seung-Yong Yang),구병춘(Byeong-Choon Goo),김형진(Hyung-Jin Kim),남태현(Tae-Hyun Nam) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
To obtain material properties of NiTi shape memory alloy showing pseudoelastic or shape memory effect, tensile test was conducted for various temperatures. Transformation temperature also was measured by using DSC(Differential Scanning Calorimeter), and crystallographic feature of transformation was observed by XRD(X-ray Diffraction).
실천공학 교수법 : 프로그램의 결과 비교를 통한 푸리에 변환의 이해
양승용 ( Seung Yong Yang ),김노유 ( Noh Yu Kim ),이정훈 ( Jeong Hoon Lee ) 한국실천공학교육학회 2010 실천공학교육논문지 Vol.2 No.2
푸리에 변환과 관련하여 많은 참고할 수 있는 문헌이 존재하지만, 수식의 복잡성과 차이로 인해, 초보자가 푸리에 변환을 이해하고 활용하는 데에는 어려움이 따른다. 본 논문에서는 관련된 수식을 정리하고 수치 결과의 비교를 통하여 푸리에 변화을 이해하고자 하였다. 대표적인 입력신호에 대하여 푸리에 변환 결과를 도시하였고 푸리에 변환의 특성을 정리하였다. Many references are available in the area of Fourier transformation. But some differences are found in the mathematical expressions provided in the references. These circumstances prohibit beginners from understanding and using Fourier transformation method. In this paper, relating mathematical expressions are epitomized and some numerical results are compared and interpreted to understand Fourier transformation. Fourier transformation results are displayed for representative input signals and some characteristics are summarized.
양승용(Seung-Yong Yang),구병춘(Byeong-Choon Goo),정흥채(Heungchai Chung) 한국철도학회 2004 철도저널 Vol.7 No.2
This paper consists of two parts. One is finite element analysis of the redistribution of residual stresses of weld specimen by cutting. This work is necessary to predict the actual residual stress distribution of weld specimens used in fatigue test. The other subject is to calculate the relaxation of residual stress and the strain field induced by cyclic loading. To obtain fatigue life of weldment, the value of strain amplitude at each position is necessary, for example in the strain-life approach, and the numerical results can be used to verify experimental strain measurements. Thermo mechanical finite element analyses were conducted on the commercial package ABAQUS.
Cetyltrimethylammonium Chloride를 이용한 자성유체의 합성
양승용 ( Seung Yong Yang ),정노희 ( Noh Hee Jeong ) 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.1
In this study, magnetite were synthesized through the co-precipitation method which prepared using ferrous chloride and ferric chloride. And ammonium hydroxide solution is used as precipitator. Ferrofluid was dispersed by cetyltrimethylammonium chloride(CTAC). The dispersion stability test using CTAC was stable in ferrofluid by the test of scanning electron microscopy(SEM). Particle size of magnetite was measured by Particle size analyzer(PSA). The smallest particle size was formed at reaction temperature 50℃, stirring speed 500rpm, 0.7mole NH4OH concentration and 20 wt% CTAC and smallest particle size as 68.8nm. Particle size was increased as the temperature and CTAC concentration as increased.