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끓는 마그세니움 클로라이드 수용액에서 304 스테인레스강의 입계 및 입내 응력부식 파괴에 관한 연구
성희준,조동율,박동환,김흥식 한국부식학회 1989 Corrosion Science and Technology Vol.18 No.1
The influence of strain rate (from 4×10^(-5) /sec to 6×10^(-8)/sec) and metallurgical factors on the stress corrosion cracking susceptibilities of AISI304 stainless steel in boiling MgCl₂ solution was investigated using slow strain rate tensile testing technique. TGSCC was predominant when the specimens were tested at low strain rate, high temperature and sensitized condition, while IGSCC was predominant at high strain rate, low temperature and solution annealed condition. The number of propagating cracks at the surface of specimen were increased with the increase of strain rate, resulting the increase of fracture strain with the increase of tensile testing strain rate.
운동역학 : 남자 멀리뛰기 도움닫기 마지막 3보와 발구름 자세의 운동학적 분석
성희준(SeongHuiJun),류재균(LyuJaeGyun),이진택(LeeJinTaeg) 한국체육학회 2003 한국체육학회지 Vol.42 No.6
The purpose of this study is to analyze the kinematic analysis of the last three strides and take-off motion in the actual competition of the men’s long jump.Five long jumpers who has been registered in the Korea Athletic Federation were involved in this study as subjects.The conclusions were as follows:1) For the skilled long jumpers, it took shorter time than the less-skilled long jumper during the take-off motion and from the last three strides to the take-off motion. 2) The better record players began to low CM at the last three step before take-off, showed the lower CM in 1-2 step phases before touch down the board and increased the CM at take-off the board.3) The better record players showed the shorter stride length and horizontal distance at last three step.4) The horizontal velocity in the approach deaccelerated at the take-off phase.5) For effective take-off motion, the player should decrease the last step at touch-down the board and the hip and knee angle as small as possible, and lean the body to backward, decrease. And to increase the impact on touch down board, the player should decrease the touch down angle of foot as small as possible, and touch down the board with whole sole of foot.6) The thigh should quickly increased the angular velocity of hip joint which plays in increasing propellent toward CM at touch down and take off the board. Esp eciaiiy, the large angular velocity caused by the fast flexion and extention should lead the effective airborne motion with having the high CM due to the fast extended propelling leg to forward.
축소기법을 이용한 구조 시스템 식별 기법에 대한 연구 및 검증
성희준(Heejun Sung),장성민(Seongmin Chang),조맹효(Maenghyo Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The objective of system identification method is to match numerical model and real model with experimental data from sensor. In this study, measured modal data from sensor is applied for numerical model based system identification. Dynamic measurements from experiments are carried out from a limited number of accessible nodes, therefore condensation method is applied to construct full model. Method for system identification of real model is introduced and validated with experimental data. Vibration test for system identification will be applied and data from experiment will be used as primary degree of freedom information when constructing full matrices. Experimental validation demonstrates that the proposed method improves the accuracy and efficiency in structural system identification.