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도마 손 짚고 몸펴 앞 공중 돌아 540도 비틀기의 운동학적 분석
여홍철,윤희중,류지선,정철정,Yeo, Hong-Chul,Yoon, Hee-Joong,Ryu, Ji-Seon,Jung, Chul-Jung 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3
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-skitters. 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 20 body landmarks during each trial were collected using a Direct Linear Transformation method. The digitized body landmarks were smoothed using a Butterworth second order with low pass digital filter and a cutoff frequency of 10Hz. 1. A skitter, got a high score for performance, showed shorter time and faster horizontal velocity than a less-skitter at the board contact. also, a skitter extended quickly his knee and hip joint after contacting board for preflight phase. 2. A skitter revealed faster time and horizontal velocity the vault from taking off board than a less-skiller. A skitter took a long time and high distance to get the vertical peak compared with a less-skiller. 3. For the second phase, a skitter, who executes the most optimal motions among the subjects, displayed a long flight time, a high height, and a far flight distance as well as maintaining consistent horizontal speed even at the peak of post flight. On the other side, a less-scorer displayed a slow vertical velocity, distance and a short time at the point of take-off from vault as well as low height at the peak of post flight.
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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.
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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.
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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.
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여홍철(Yeo, Hong-Chul),김혜영(Kim, Hye-Young),김채은(Kim, Chae-Eun) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.4
The purpose of the study is to give information to gymnasts and coaches for improving athletic performance balance beam in the World Championships 2015. The subjects 8 final gymnasts in balance beam competition of the analyzed elements and complete got the results the following conclusions. Balance beam in the skills analysis of the used score included many gymnast on the balance beam that is a D score from 5 .0 to 5 .4(33.0%) points, t he E score was as 7.5 to 7 .95(18 .9%) points. The final average difficulty is 13.13 ± 2.3, the acrobatic of the element was used for 55%, dance element was used as 45%. The most often acrobatic elements are used difficulty D (23%) and dance elements are found to difficulty A (17%). Complete is generally the higher the rank the higher. From 1 to 4 the final result above showed that more than 87% complete, while the above 5-8 is about 80% complete, So it was low and the complete in spite expectations high scores. Expectations value of the connection points affecting the complete was 0.49 ± 0.17 points, and the competition score was the difference of about 0.31 points as level of 0.18 ± 0.07.
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여홍철(Yeo, Hong-Chul),김혜영(Kim, Hye-Young),김윤지(Kim, Yoon-Ji) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.3
The purpose of the study is to give information to gymnasts and coaches for improving athletic performance and about the possibility of medals on Floor Exercise final in Olympics Game(OG) and World Championship(WC). The professional gymnastics study for the floor exercise difficulty score has compared the difficulty value (DV) and the connection value(CV) and have made changes to the code of trend skills. The OG athletes believe that the acro A element is 22% higher, the E element is 13% higher, and the G element is 2% lower than the standard. On the other hand, the WC athletes believe that the A element is 21% higher, the D and E element is 11% higher, and the H element is 5% lower than the standard. As a result, the OG compared to the WC see that the DV is lower and the difficult score is higher. The OG athletes view that the dance A element is 11% is lower, C element is 12%, and the D element is 13% is higher. The WC athletes see that the C element is 15% higher and the E element is 13% higher. In the overall analysis, the CV for the OG is 0.40 ± 0.19, and the WC is 0.14 ± 0.12. The OG have a result of 60% in the acro element and a 40% in the dance element, whereas the WC have a 61% in the acro element and a 41% in the dance element that shows no difference. However, with the new emergence of the higher I element, the double salto bwd tucked with a 720°(5.702) was in the G element and has been put into the H element. The acro element has increased no matter what.
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