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여홍철 한국운동역학회 2003 한국운동역학회지 Vol.13 No.1
Yeo, H-C. Kinematic Analysis of Yeo Motion at Horse vaulting. Korean Journal of Sport Biomechanics, Vol. 13, No. 1, pp. 39-50. The purpose of this experiment was to find out the stages of result of specific character for Horse Vaulting Yeo motion To put the Yeo movement in process, we needed a gymnastics athlete C height of 165cm, weight of 62kg, age of 32, personal history of 21 years, and tested the athlete 5 times of motion training, and picked out the 2 best motion and analyzed it. Athletic reason is vertical motion, time uses, horizontal motion, distance, speed, and analyzed many other reasons as a result, and finally ended up with this conclusion. 1. After the take off on the board horizontal speed gradually decreased However, reverse of that, it showed that vertical speed increased. 2. While contacting the Horse Vaulting horizontal speed decreased and vertical speed kept on increasing. Taking off from the Horse Vaulting horizontal, showing short time of training, 3m vertical height is shown after using Yeo motion at the peak of second fly jump. 3. While contacting Horse Vaulting, both arms were showing the flection shape Especially this is also while contacting Horse Vaulting, left arm was showing 90˚angle, and this has happened between the process of transition period of fast horizontal speed to vertical speed. 4. While contacting Horse Vaulting, perfect blocking of the left arm must be complete for the right arm to have the perfect blocking as well.
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.
도마 손 짚고 몸펴 앞 공중 돌아 540도 비틀기의 운동역학적 분석
여홍철,류재균 한국운동역학회 2004 한국운동역학회지 Vol.14 No.1
H. C. YEO, J. K. RYU. The Mechanical Analysis of the Hand spring forward and Salto forward straight with 3/2 Turn on the Vault. Korean Journal of Sport Biomechanics, Vol. 14, No. 1, pp. 13-26, 2004. The purpose of this study was to investigate the differences of the kinematical and the kinetical factors that calculated from preflight to postflight of salto forward straight 3/2 turn motion between skitters and less-skillers. Four S-VHS video cameras operating at 60Hz were used to record the performances. Five elite male gymnasts were participated in this study as subjects. Three-dimensional coordinates of 21 body landmarks during each trial were collected using a Direct Linear Transformation method. The raw 3-D coordinates of the 21 body landmarks were smoothed using a second order lowpass, recursive Butterworth digital filter and a cutoff frequency of 10Hz. Load cells attached on the beneath of a board were used to attain the kinetic variables. It was found that the more angular momentum in the longitudinal axis, the less vertical velocity and these angular momentum effected the height of peak in the preflight. Also, it was revealed that the larger angular momentum in the medio-lateral axis was rather than it in the longitudinal axis to increase vertical height and rotation force of the body. For the reaction force of springboard, the vertical and the horizontal reaction force were 16.52BW and 3.45BW, respectively. It was found that the higher value of the vertical reaction force induced the faster vertical velocity and the higher angular momentum. of the whole body center of gravity.
세단뛰기 지지국면 시 사지의 각운동량과 운동수행과의 관계
류재균,여홍철 한국운동역학회 2004 한국운동역학회지 Vol.14 No.1
J. K. RYU, H. C. YEO. The Relationship between the Angular Momentum of the Limbs and the Performance during Support Phase of the Triple Jump. Korean Journal of Sport Biomechanics, Vol. 14, No. 1, pp. 65-81, 2004. The purposes of this study were to determine the functions of actions of the limbs during each of the three support phases of the triple jump and their relationships with the performance of the triple jump. Four elite male triple jumpers were participated as subjects. The Pearson product moment correlation coefficient were used to determine and compare the relationships between the change in each component of the normalized angular momentum of the whole body about center of gravity and the actions of the extremities during different support phases. A level of significance at a=.05 was set. After analyzing the angular momentum and correlation during support phase of the hop, step, and jump, the following findings are obtained: The actions of the arms created a side-somersaulting angular momentum about the whole body center of gravity toward the side of the free leg during the support phase of the step, and a somersaulting angular momentum about the whole body center of gravity during each support phase. The action of the free leg created a somersaulting angular momentum about the whole body center of gravity during the support phases of the hop and step.
남자 도마에서 손 짚고 앞공중돌아 540도 비틀기의 운동학적 분석
김진수,여홍철 경희대학교 체육과학연구소 1999 體育學論文集 Vol.27 No.-
The purpose of this study was to examine the biomechanical factors performing Lou Yun vaults in men's gymnastics. Three elite gymnasts were participated in this study who could perform Lou Yun vault. The vault motions were analyzed using the DLT method of the dimensional videography. The shutter speed was set 1/250 and subjects motion was videotaped with normal speed. Four range poles were used as a reference system. The vaulting motion was divided into five phases, board contact, preflight, horse touch, postflight, landing. The variables analyzed were duration, horizontal/vertical displacement, velocity, the body segment angle. The results obtained from this study were as follows; 1. The board contact time was 0.063 ± 0.015 second, preflight time was 0.267 ± 0.015 second, horse contact time was 0.417 ± 0.012 second, and posflight time was 1.407 ± 0.021 second. 2. The horizontal displacement of COM from board contact to horse touch was 122.20 ± 6.80(cm). CSM showed 129.0(cm), which is the longest displacement, YHC recorded 122.2(cm), and KDH was 115.4(cm). 3. The horizontal displacement of COM from horse take-off to landing was 458.90±11.01(cm). YHC was 471.6(cm), KDH was 452.0(cm), CSM was 453.1(cm). 4. The take-off velocity from the board displayed 6.437 ± 0.198(m/s) and the take-off velocity from the horse was 4.243 ± 0.058(m/s). 5. The take-off angle from the board was 30.57 ± 0.81° and there was not a great difference among the subjects. The blocking angle during the horse contact was 45.33 ± 4.95° and YHC displayed 49.6°, which is the largest of them.