골프 스윙동작의 운동학적 분석

신성휴,고석곤 한국운동역학회 2003 한국운동역학회지 Vol.13 No.2

Shin, S-H and Ko, S-K. A Kinematic analysis of Golf Swing Motion. Korean Journal of Biomechanics, vol. 13, No. 2, pp. 101-114. The purpose of this study was to examine the major kinematicak variance to increase the club head velocity during the driver swing two PGA prp-golfers utilizing 3-dimensional image analyzing linear velocity of the club-head during the impact quantiatively. To achive these purpose, two high speed camera in 120 field/s and one high-speed camera in 500 field/s were used in this study. The program made by Younghoo Kwon(1944) was used to analysis the digitalization of reference point, digitalization of joint venter, synchronization, calculation of 3-Dimensional coordinate by DLT method, and smoothing. Through this study, the conclusions are as follow. 1. During the driver swing, in the percentile of the total time, two pro-golfer showed 0.925,0.929 second from adress to top-swing, 0.236,0.929 second from top-swing to impact. 2. During the driver swing in the displacement of the center of the body, two pro-golfer showed 45.3,45.23% from adress, 44.3,44.24% from impact. 3. In the velocity variance. The maximum blub-head velocity two pro-golfer showed 43.36,43.24m/s respectively the down swing. The ball velocity showed 63.12,63.06m/s. 4. In the rotational angle of the shoulder joint, two pro-golfer showed -13.5,13.53°during the back swing respectively. Two subject adressed opening status og upper body. 5. In the rotational angle of the right knee angle showed 156.3,154.7°from the adress.

Electromyography 기법을 이용한 육상 크라우칭 스타트의 하체 근 동원 비교분석

신성휴,박기자 한국운동역학회 2003 한국운동역학회지 Vol.13 No.2

Shin, S-H and Park, K-J. Electromyography Analysis of Muscle Activities of Lower limb for Crouching Start Technique. Korean Journal of Sport Biomechanics, Vol. 13, No. 2, pp. 115-122. The purpose of this study were to analyze the muscle activities and the characteristics of muscle recruting patterns of lower limb for crouching start technique using four elite sprint. The EMG technique was used to record muscle activities of both right and left sides of retus femoris, vastus medialis, biceps femoris, and gastrocnemius. Eight surface electrodes were placed on the surface of the selected muscles and one ground electrode was also attached on the back of neck(C7). One video camera was also used to recored the crouching start motion to define 6 events and 5 phases for further analysis. The raw EMG data were filtered with band pass filter(10-350) to remove artifacts and then low pass filtered(4Hz) to find the linear envelope which resemble muscle tension curve. This filter EMG data were normalized to MVIC for the purpose of comparison between right and left sides muscle. The results of this study were as follows. All four subjects showed that vastus medialis muscle activity was comparatively higher than those of retus femoris, biceps femoris, gastrocnemius. And left side of muscle activity was comparatively higher than right side of muscle activity. Therefore, when the subjects starting out crouching start position, we recognized that the muscle of lower limb showed interaction effect by each muscle.

500m 숏트랙 스피드 스케이팅 출발동작의 운동학적 분석

신성휴,백진호 한국운동역학회 1996 한국운동역학회지 Vol.6 No.1

본 연구의 목적은 숏트랙 스피드 스케이팅 500m 종목의 출발 구간에 대한 운동학적 특성을 알아 보는데 있다. DLT기법을 이용한 3차원 영상분석 결과 다음과 같은 결론을 얻었다. 출발 구간의 기록이 좋을수록 첫발이지 시간이 빠른경향을 보였으며, 평균 빙면 접촉시간이 짧았다. 신체중심의 수평이동변위는 출발후 0.4초를 전후하여 급격히 증가하였으며, 기록 이 좋을수록 이러한 시간이 빠르게 나타났다. 또한 기록이 좋을수록 출발자세가 낮고, 신체중심의 수직이동변위가 최고높이에 도달하는 시간이 짧았으며, 스케이트날의 속도는 추진동작에서 가속되어 제자리동작시에 점점 감속되다가, 빙면접촉시(글라이딩)에 최저의 속도를 나타냈다. 또한 스텝거리보다는 스텝률을 이용하려는 경향을 보였다. 이상의 결과를 요약하여 보면, 빠른 첫발이지시간과 가속시간, 짧은 빙면 접촉시간, 낮은 출발자세, 빠른 스텝률, 큰 추진각등이 출발구간의 기록을 단축시킬 수 있는 운동학적 요인들로 규명되었다. 본 연구에서는 출발자세를 일정하게 통제하지 않았는데, 앞으로 출발자세에 따른 운동학적 특성 및 본 연구결과 외에 출발구간에 영향을 미칠 수 있는 요인들과 개개인의 신체적인 요건, 그리고 기술의 숙련도에 따른 동작의 제시에 관한 연구가 요구된다. The purpose of this study is to explain the kinematical characteristics of starting techniques in 500m short track speed skating. 3Dimensional video techniques were used to capture the movement of starting phase of 4 female short track speed skater who place in the world class. Based on the results of this study, the following conclusion were drawn. 1. The better the record of starting phase is the faster take off time of first foot. 2. The better the record of starting phase is the shorter average of contact time on ice surface. 3. For 0.4 second after starting, the horizontal displacement of C.O.G. has increased rapidly. 4. The better the record of starting phase is the lower ready position. 5. The velocity of skate blade accelerates n the propulsive motion, decelerates in the recovery motion and finally showes the lowest velocity during contact of ice surface. 6. The better the record of starting phase is the higher step rate.

한국인 인체 중심 산출 방안 연구

신성휴 한국운동역학회 1996 한국운동역학회지 Vol.6 No.1

본 연구는 생체역학 연구 가운데 많이 사용되고, 스포츠 기술과 밀접하게 관련된 인체중심을 정확하게 산출하기 위하여 수행되었다. 즉 한국인의 인체 중심을 실측하고, 실측치와 차이를 보인 선행 연구 결과들 가운데 국내에서 많이 사용되는 외국의 결과를 보정하여 정확한 인체 중심을 구할 수 있도록 인체 분절의 질량비를 제시함으로써 생체역학 연구와 운동 기술 평가에 도움을 주고자 하는데 그 목적을 두었다. 인체 중심을 구할 때 현재 국내에서 가장 많이 사용되는 Dempster(1955), 또는 松井(1956)이 구한 인체 분절별 전신에 대한 비율을 한국인의 인체 중심에 알맞게 보정하고 타당성을 분석한 다음 제시하였다. Dempster가 제시한 방법은 한국인 남자의 인체 중심과 2.29% 차이를 보였으며, 松井이 제시한 방법은 1.54% 차이를 보였다. 이러한 차이를 인체 중심에 국한하여 정확한 값을 얻을 수 있도록 그들이 제시한 분절의 질량비를 개선하여 제시하였다.

유묘기 장기간 습해처리에 따른 옥수수의 생육 및 수량 특성 변화

신성휴,정건호,김성국,손범영,김상곤,이진석,김정태,배환희,권영업,심강보,이재은,백성범,전원태,Shin, Seonghyu,Jung, Gun-Ho,Kim, Seong-Guk,Son, Beom-Young,Kim, Sang Gon,Lee, Jin Seok,Kim, Jung Tae,Bae, Hwan-hee,Kwon, Youngup,Shim, Kang-Bo,Lee, 한국초지조사료학회 2017 한국초지조사료학회지 Vol.37 No.4

본 연구는 사료용 옥수수의 내습성 검정을 위한 기초자료를 얻고자 자식 6계통을 3엽기에 30일간 습해 처리 후 옥수수의 생육 특성 및 수량 변화를 구명하고자 농촌진흥청 국립식량과학원 중부작물부 시험포장(온실)에서 수행한 결과를 요약하면 다음과 같다. 1. 습해 처리 시 모든 자식 계통이 무처리에 비하여 초장, 완전전개엽수 및 엽색도(SPAD)는 모든 계통에서 유의적으로 감소하였으며 엽색도는 KS140 계통이 높았고 KS141 계통이 낮았다. 2. 지상부와 뿌리의 건물중은 습해처리 후 모든 계통이 유의적으로 감소하였으며 자식 계통들 간에는 KS140이 가장 많았고 KS163이 가장 적었다. 부정근의 건물중은 무처리와 유의적 차이는 없었으나 KS140 계통에서 높은 경향을 보였다. 3. 수확기 옥수수의 이삭길이와 두께 및 착립이삭길이, 개체당 종실수 모두 무처리에 비하여 유의적으로 감소하였다. 무처리에 비하여 이삭 길이와 두께는 KS141 계통이 착립 이삭길와 개체당 종실수에서는 KS164 계통이 가장 적게 감소하였다. 4. 옥수수 수량은 무처리에 비하여 습해 처리한 모든 계통에서 유의적으로 감소하였으나 습해 처리 계통들 간에는 KS164 계통만 유의적으로 수량이 높아 내습성인 것으로 판단하였다. 5. 옥수수 유묘기 30일간 습해처리시 초장, 엽색도(SPAD값), 완전전개엽수가 옥수수 수량과 상관이 높았다. Waterlogging strongly affects maize (Zea mays L.) growth. It is necessary to find the screening method of waterlogging tolerant maize lines. This study was to investigate the growth characters at V3 stage of maize, when is very sensitive to waterlogging. Six Korean maize inbred lines were subjected to waterlogging at V3 stage for 30 days. The 30 days waterlogging treatment significantly reduced plant height, number of expanded leaves, and SPAD value, compared with the control plants. SPAD values were significantly different among the six inbred lines, KS140 was the highest. The dry matter accumulation of aerial and root part were significantly decreased by 30 days waterlogging. KS140 was the weightiest among inbred lines. The dry matter of adventitious root showed same trend. Waterlogging treatment significantly reduced to ear length and thickness, grains filling length, grain number per ear, and maize grain. Plant height, SPAD value, and number of fully-expanded leave showed high correlation with maize grain yield, but number of senescent leaves, dry matter of adventitious root and TR ratio did not, suggesting that the former three traits may be good indicator for evaluating 30-day waterlogging tolerance of maize inbred lines. KS164 was the highest yield by increasing of grains filling length and grain number per ear of among waterlogging inbred lines. According to the results, evaluation of maize waterlogging should be consider both early growth characteristics and resilience in the later growth stages.

Electromyography 기법을 이용한 씨름 덧걸이 기술의 상체 근 동원 비교분석

신성휴,임영태,김태완,박기자,권문석 한국운동역학회 2003 한국운동역학회지 Vol.13 No.1

Shin, S-H · Lim, Y-T · Kim, T-H · Park, K-J and Kwon, M-S. Electromyographical Analysis of Muscle Activities of Upper Trunk for Ssireum Dutguri Technique. Korean Journal of Sport Biomechanics, Vol. 13, no. 1, pp. 95-108. The purposes of this study were to analyze the muscle activities and the characteristics of muscle recruiting patterns of upper trunk for Ssirum dutguri technique using three top-ranked elite Ssirum players. The EMG technique was used to record muscle activities of both right and left sides of latissimus dorsi, biceps brachii, and erector spinae. Six surface electrodes were placed on the surface of the selected muscles and one ground electrode was also attached on the back of neck(C7). One video camera was also used to record the Ssirum motion to define 4 events and 3 phases for further analysis. The raw EMG data were filtered with band pass filter (50-400 Hz) to remove artifacts and then low pass filtered (4 Hz) to find the linear envelope which resemble muscle tension curve. This filtered EMG data were normalized to MVIC for the purpose of comparion between the subjects. The results were indicated that each subject with different physical characteristics showed very different muscle activity patterns. Although Ssirum dutguri is considered as foot technique the player grasped opponent's satba(belt) with both hands when they play. Because of this reason, activities of upper trunk muscles were relatively high. However, direct comparison between upper and lower body muscles was not possible due to the lack of the data in present study. Interestingly, all threes subjects showed that erector spinae muscle activity was comparatively higher than those of latissimus dorsi and biceps brachii. This implies to reinforce back muscle as a routine of training to improve performance or to prevent back injury. implies to reinforce back muscle as a routine of training to improve performance or to prevent back injury.

여자역도선수들의 Squat시에 대퇴근의 EMG 활동전위 연구

신성휴,안병훈 한국스포츠리서치 2006 한국 스포츠 리서치 Vol.17 No.2

柔道技術 중 허벅다리걸기의 運動學的 特性

신성휴,손명성,김원섭,최승필 한국운동역학회 1998 한국운동역학회지 Vol.8 No.2

This study has been aimed to analyze UCHIMATE technique of Judo gymnastically. The following are the results and the proposition obtained through an image analysis method 3 men half heavy weight champions of the national Judo standing team(85-95kg) were used as subjects for the study. 1. CONCLUSION The following are the conclusion obtained through the discussion of analysis results of the Uchimata technique using 3 men, half heavy weight(85-95kg) champions of the National standing Judo team. 1) The time performing total technique were 1.48-seconds which was performinglonger than the light heavy weight class of 1.28-seconds by 0.20-seconds, this showed that the heavy weight class players demonstrated the technique later than the light heavy weight class palyers. 2) The average length of moving 1-step leg for attacking was 24.27cm, and 2-step leg moving was 92.87cm on average. Therefore, the shorter the moving distance, the more the technique performing hour could be shortened. 3) In the hanging phase, the moving displacement of the center of gravity of the body weight showed in horizontal, vertical, right and left direction 28.97cm, 21.59cm and 13.57cm respectively. Each of which were longer than the phase of KUZUSHI and TSUKURI. Such results show that the center of gravity of the body in move lift the opponent. This reducing the displacement of body weight from the center toward the right and left direction in the phase of KAKE is considered to be effective in demonstrationg the technique. 4)The central speed of the body was 0.8cm per second on average and the average vertical speed was 0.74cm per second. The speed of right and left movement was 0.51cm per second on average which showed the horizontal speed was the fastest while it is preferred that the vertical speed should be faster than that of the horizontal. 5) Angle of the Trunk showed 98.13 ˚ on average in the hanging phase and the larger the trunk angle, the shorter the needed time to demonstrate the technique, thus making the throw of the opponent over shoulder more advantageous. 2. PROPOSTION The following propositions are suggested through this analysis for further study : 1) It is to be considered that the kinetics in hanging the thigh and the degree of every segment of the body be studied in a more detailed fashion. 2) A study on the technique of thigh hanging in an actual game situation (rather than during mere exercises) is necessary. 3) It is necessary to study the TORI and UKE techniques together. 4) The study of each weight class ought to be performed.

Effect of Plant Density on Growth and Yield of Extremely Late-Planted Korean Sweet Corn Hybrids (Zea mays L.) for Fresh Market

신성휴,Jin-Seok Lee,Beom-Young Son,Jung-Tae Kim,Sang Gon Kim,Mi-Jung Kim,Sun-Lim Kim,Young-Up Kwon,Seong-Bum Baek,우미옥,Hwan Hee Bae 한국작물학회 2014 Journal of crop science and biotechnology Vol.17 No.4

Sweet corn has a short growing period of 80 to 90 days in Korea, which allows famers to grow this crop using various croppingsystems. This objective of this study was to find the optimum plant density for Korean sweet corn (se) hybrids ‘Godangok’ and‘Guseulok’ when they were grown as the second crop. Plant densities were 5,710, 6,670, and 8,000 plants 10a-1 and planting dateswere 20 July and 30 July, 2013. There was no interactive effect between plant density and hybrid for all the analyzed parameters inthis study. Increasing plant density up to 8,000 plants 10a-1 led to no significant gain in marketable ear yield. Although the total numberof ears was increased about 21 ~ 33% at the highest plant density than at lower densities, e.g., 6,670 or 5,710 plants 10a-1, the percentageof marketable ear number and individual ear weight decreased with increasing plant density. Individual ear weight of marketableears was significantly greater, e.g., by 8 ~ 13%, at 5,710 plants 10a-1 and 6,670 plants 10a-1 than at 8,000 plants 10a-1. Similarresults were obtained for ear length and width and filled length under the given plant densities, which indicated that increasing plantdensity may decrease individual ear fresh weight and ear size with good tip fill. Increasing plant density up to 8,000 plants 10a-1caused the lowest harvest index, which resulted in little gain in fresh ear yield compared to the lower plant densities of 5,710 and6,670 plants 10a-1. These results indicated that the optimum plant density for those sweet corn hybrids planted in July would bebetween 5,700 and 6,700 plants 10a-1 in terms of marketable ear yield and quality of marketable ears

마루運動中 Standing Tucked Backward Somersault의 動作 分析

申性休 成均館大學校 1982 論文集 Vol.32 No.-

To analyse the movement of Standing Tucked Backward Somersault among the Floor Exercise in Gymnastics, I came to modle the four best gymnast of male for research, recorded the movement in the film, enlarged, and cristlized the detalis, apperaed in the film and came to the conclusion as following; 1. Take-Off Angle was appeared at the mark of 2°6″∼7°, and should make power of vertical large, having Take-Off Angle close to the vertical distance. 2. As the nore the Flight Angle was related with the distance, the greater the Flight Angle is, and the longer the removal distance of body was appeared. 3. Somersault became faster as Trunk Angle and Leg Angle were tucked more. 4. Height was revealed as 143㎝∼163㎝. The vertical distance became greater when vertical velocity was increased with by means of the dynamic take-off. 5. Though Landing Angle showed from 84°to 86°, and if the comfortable landing pose is completed in landing, the control of the Landing Angle and the training of the landing technique was necessary in the above research.