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구형도마와 신형도마에서 Yeo2동작의 운동학적 변인의 비교 분석
여홍철,김윤지 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2
The purpose of this study was to examine the difference between Yeo2 with old model vault and Lu Bin with new model vault by three dimensional image analysis method. From this analysis, I arrived at the following conclusions. 1. Lu Bin with new model vault took longer phase time and higher peak-height comparing to Yeo with old model vault. 2. The horizontal and vertical velocity of the old model vault was similar to the new model vault at tine time of touching down and taking off the board. The Lu's hip and shoulder joint angles were bigger than the Yeo's at the time of touching down and taking off the board.
윤희중,여홍철,김태삼 한국운동역학회 2001 한국운동역학회지 Vol.11 No.1
The purpose of this study was to investigate the effect of the kinematic factors about event of the Yeo2 motion on the Horse Vault. The subject in this study was 1 male gymnast to performance Yeo2 motion. Two video cameras were used to attain kinematic variables by phase. As a result, the following conclusion was drawn; 1. As the take-off time on the board was short, it appeared to increase horizontal and vertical velocity. In the motion, the flight apex height increased largely, too. 2. As the contact time on the board was short, it appeared to performance the air motion smoothly by increasing the horizontal distance and apex height. 3. The horizontal and vertical velocity in take-off on the board appeared increase horizontal distance and apex height. 4. To increase the apex height and horizontal distance, the body appeared to must be take the posture of vertical axis in take-off on the board.
비선형 유한요소법을 사용한 고무 마운트의 정특성 해석에 있어서 체적 탄성 계수의 역할
여태인,최윤홍 울산대학교 1999 공학연구논문집 Vol.30 No.2
고무 스프링의 정 스프링 상수를 해석하기 위해 비선형 유한요소법을 사용할 때, 고무의 구성 방정식은 초탄성 재료 모델로 표현한다. 일반적으로 엔진 마운트의 설계를 위한 초탄성 모델의 재료 상수들은 일축 압축 시험과 단순 전단 시험 결과만을 이용하여 구해진다. 그러나 체적 시험을 생략하고 고무를 비압축성으로 가정한 비선형 유한 요소 해석 결과는 매우 부정확한 결과를 가져올 수 있다. 본 연구는 수치 해석 결과에 미치는 체적 탄성 계수의 영향을 조사하여, 엔진 마운트의 형상 계수가 클 때는 체적 변형율의 정확한 측정이 다른 두 물성치의 측정과 마찬가지로 중요하다는 것을 보이고 있다. When a nonlinear finite element analysis is used to find the static spring constants of a rubber spring, the constitutive equations of the rubber are represented by a hyperelastic model, of which material constants are determined from the different types of material tests. Uniaxial compression and simple shear tests are usually chosen due to their experimental conveniences, while volumetric test is often underestimated and omitted. But the hyperelastic model obtained from the two kinds of tests alone can result in rather poor performance for a certain engine mount when the rubber is assumed to be incompressible in teh finite element procedure. This study investigates the influences of bulk modulus, which are found to be as equally important as other two material properties, on the numerical results when the form factor of the mount becomes large.
경화된 열경화성 수지와 고분자재의 혼합성형에 관한 특성
김석호,윤한기,여홍태 東義大學校産業技術開發硏究所 1998 産業技術硏究誌 Vol.12 No.-
For the purpose of recycling the rigid thermosets, this study investigated the film of thermoplastic mixed with some weight fraction of rigid phenol in the hot compression molding at temperature of 200℃. The results abtained are as follows; the tensile stress according to the weight fraction of phenol particle is linearly proportional to the strain upto 2% of strain, the more the grain fraction of phenol is, the smaller the stress and strain is at frature, in case of the same weight fraction of phenol, the stress and strain of large grain is larger than those of small grain.
Synthesis of the Knowledge Model for Fault Diagnosis Using Qualitative Simulation
Yoon, Yeo Hong,Yoon, En Sup,Choe, Yong Jin,Jeong, Chang Wook 한국화학공학회 1993 NICE Vol.11 No.3
Fault diagnosis requires the knowledge models which describe the behavior of the chemical processes. However it is cumbersome and time consuming work to generate these models. Also the knowledge acquisition required for generation is difficult. The objective of this study is to examine whether the knowledge aquisition for fault diagnosis knowledge models, especially bottom-up models, is possible through quatlitative simulation. Qualitative simulation is based on the study of modeling, representation of feedback control and state transition using the QSIM algorithm. Also in this study, qualitative simulation is applied to a buffer tank level control system using the simulatom strategy of this paper. The results of the simulation show several behaviors of the processes and the usability for the generation of a knowledge model. However when several different results of simulation are generated, some are spurious solutions which result from insufficient information.