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RISS 인기검색어
- 검색키워드
- 저자 : 여홍철 ( Hong Chul Yeo ) (검색결과 26 건)
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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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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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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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남자 도마에서 손짚고 앞공중돌아 540 도 비틀기의 운동학적 분석
여홍철(Hong Chul Yeo),이동우(Dong Woo Lee),김재필(Jae Pil Kim) 한국사회체육학회 1999 한국사회체육학회지 Vol.12 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 vaultin 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 postflight 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 take0off 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.
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방과 후 체육교사 지도행동이 초등학생들의 내적동기 및 참여의도에 미치는 영향
여홍철(Yeo, Hong-Chul),오준석(Oh, Joon-Seok) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.5
This study is to provide the evidences to facilitate more participation in the physical activities by research the relationship between the teacher’s behavior and internal motivation and participation intention perceived by the participants in the physical education class after school program for elementary school. Participants in this study were analyzed targeting the 300 students in the fifth and sixth grade of the five elementary schools in G Metropolitan City and its validity and reliability were verified using the SPSS/AMOS 18.0 statistical program. The results of the appropriate analytical procedure in accordance with the purpose of this study are as follows. Firstly, the positive feedback in the teaching behaviors of teachers is found to have a positive (+) effect on the fun and competence of the internal motivation and tension to have a negative (-) effect. The negative feedback gave negative (-) effect on the fun and competence but increased tension. Secondly, the positive feedback behavior in the teaching behaviors of teachers is confirmed to enhance the intention of participation. Thirdly, the students in the elementary school are analyzed to have a higher degree of the participation intention in proportion of their interest in the physical education class after school program from elementary school. In other words, it is considered that the effort for the various teaching methods to induces the fun and interest as well as the positive feedback behaviors of teachers raise the students’ participation.
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장재관(Chang Jae-Kwan),여홍철(Yeo Hong-Chul) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.4
The purpose of this study was to investigate professional golfer's technical factors which influenced to the official world golf ranking. The subjects were professional golfers who were ranked within 63th in the official world golf ranking in 2007. The research assumptions were as following, First, there would be a correlation between golf's technical factors and world ranking. Second, there would be some notable differences in golf's technical factors which would effect to 5 groups differently. The results could be summarized as follows. The average driving distance was 291.20 yards and the average scoring average was 70.01. The world golf ranking had a meaningful correlation both the putt per round and scoring average. The short game ability which was putt per round and scoring average was the key factor which influenced to the official world golf ranking. The scoring average factor had a meaningful effect less than 1% in the statistics level on the official world golf ranking. Performance Statistics are unlikely to able to predict the better performers in the official world golf ranking.
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