정상인의 전완 키네지오 테이핑 적용이 최대 악력과 근육 활성도에 미치는 영향

이용식(Lee Young-Sik),이정호(Lee Jung-Ho),이종훈(Lee Jong-Hun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.3

The purpose of this study was to determine the effect of applied forearm kinegio taping on maximal grip strength and muscle activation of healthy adults. six male adults over 19 years of age volunteered in this study(the average height :176.17±6.55㎝, weight :66.83±10.49㎏, age : 25.17±1.17years). We measured grip strength using hand dynamometer. We calculated maximal muscle contraction using EMG(Noraxon, USA). The root mean square of the surface EMG was used for maximal grip strength. The t-test were used to compare the differences between the sport taping and no taping. The level of statistical significance was set at p<.05. This result were that the maximal grip strength was not significant difference. The mean RMS were not significantly difference in flexor carpi ulnaris, brachioradialis, extensor carpi radialis longus muscles. Also, there were significantly difference in integral EMG at three muscles. Forearm kinegio taping could not be enhanced maximal grip strength in health adults. However, the control of force may be enhanced by kinesio taping on forearm muscles.

이단평행봉 Yega 기술동작의 관절각 및 각운동량 분석

이용식(Lee Young-Sik),백진호(Back Jin-Ho) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.2

This study was intended to assist athletes in having a technical understanding of the Yega motion and provide basic material for improving their competitive ability by analyzing the Yega motion during the competition of the uneven parallel bar of female gymnastics. For this purpose, the game of female gymnastics participating in the uneven parallel bar game was personally videotaped using the DLT(direct linear transformation) method. An attempt was made to make a comparative analysis of the Yega motion by dividing the final first to third places into the upper group('A' group) and the sixth to eighth places into the lower group('B' group). Based on the results of actual analysis on the scenes of actual game, the following conclusion was concluded: It was shown that in terms of angular variables athletes in the 'B' group exhibited techniques by forming the greater shoulder angle, hip-joint angle and trunk angle compared to counterparts in the 'B' group. It was found that in terms of angular velocity variables athletes in the 'A' group showed the greater angular velocity of shoulder joint, hip joint and trunk compared to counterparts in the 'B' group. And also found that athletes in the 'A' group showed the greater angular momentum of the center of the body compared to counterparts in the 'B' group.

남녀 유아의 연령별ㆍ성별에 따른 체격 및 체력의 특성 비교분석

이용식(Lee, Young-Sik),김성중(Kim, Seong-Jung),임영태(Lim, Young-Tae) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3

The study aimed to compare the physique and physical characteristics of male and female children by age and gender. The results can also be used not only to set a barometer for the children’s physical development status but also to provide the basic data which required to the field of education. 278 kindergarteners (age: 5-7 years old) in D city were participated as subjects. Two physique tests such as height and weight measurements and five physical tests such as bending forward, long jump, balance, 25 m shuttle run, and hanging in the horizontal bar were performed to measure physical fitness level. The results of the study were as follows: 1) height and weight were significantly increased with age but gender differences in physical characteristics were not found so comparison between the gender was meaningless, 2) physical fitness level tends to improved according to the age but the flexibility and agility levels of 7 year-old boy group were lower than 5 to 6 year-old boy groups in particular, 3) for physical fitness comparison between the gender, significant differences were found in flexibility and balance tests. Girls showed the higher scores than the boys so female has superior physical fitness status than the male in these ages.

탁구 포핸드 카운터 드라이브 동작의 운동학적 변인 및 지면 반력 분석

이용식 ( Young Sik Lee ),이종훈 ( Chong Hoon Lee ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.2

The purpose of this study was to analyze kinematic quantitative factors required of a forehand counter drive in table tennis through 3-D analysis. Four national table tennis players participated in this study. The mean of elapsed time for total drive motion was 1.009±0.23s. At the phase of impact B1 was the fastest as 0.075s. This may affect efficiency in the initial velocity and spin of the ball by making a powerful counter drive. The pattern of center of mass showed that it moved back and returned to where it was then moved forward. At the back swing, lower stance made wide base of support and a stronger and safer stance. It may help increasing the ball spin. Angle of the elbow was extended up to 110.75±1.25° at the back swing and the angle decreased by 93.75±3.51° at impact. Decreased rotation range of swinging arm increased linear velocity of racket-head and impulse on the ball. Eventually it led more spin to the ball and maximized the ball speed. Angle of knee joint decreased from ready position to back swing, then increased from the moment of the impact and decreased at the follow thorough. The velocity of racket-head was the fastest at impact of phase 2. Horizontal velocity was 7796.5±362.5 mm/s and vertical velocity was 4589.4±298.4 mm/s at the moment. It may help increase the speed and spin of the ball in a moment. The means of each ground reaction force result showed maximum at the back swing(E2) except A2. Vertical ground reaction force means suggest that all males and females showed maximum vertical power(E2), The maximum power of means was 499.7±38.8 N for male players and 519.5±136.7 N for female players.

중학교 배구선수들의 좌우 무릎과 어깨 관절 근육들의 근활성도 비교 분석

이용식(Lee, Young-Sik),임영태(Lim, Young-Tae),권문석(Kwon, Moon-Seok) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.6

The purpose of this study was to analysis of bilateral muscle activation of knee and shoulder joint muscles in middle school volleyball player. Using EMG data from 44(male 22, female 22) middle school students participating in this study, we computed the muscle activation of right/left rectus femoris, biceps femoris, anterior deltoid, posterior deltoid during the knee and shoulder joint isokinetic contraction(60 deg/s., 180 deg/s.). Right side was found to be significantly different from left side on the average muscle activation of rectus femoris, anterior deltoid in the angular velocity 180 deg/s.. In the 60 deg/s., Right side was found to be significantly different from left side on the average muscle activation of poterior deltoid. And the increase of the angular velocity makes the average muscle activation increase Therefore muscle activation balance on the knee and shoulder joint beteen right and left exists in middle middle school volleyball player.

경륜의 선행 경주 전법에 영향을 미치는 요인

이용식(Lee, Young-Sik),김정훈(Kim, Jung-Hoon) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.6

The main purpose of this study was to investigate the main factors that affect the front racing strategy in Keirin, a cycling race implemented by Korea Sport Promotion Foundation. Ten cyclists participated in this project and performed Several variable tests, ie., 1) laboratory tests: body composition, muscle strength measurement, Wingate test and 2) velodrome test: pedaling power test and, 200 m and 500 m record. Through correlation and linear regression analysis, we found the following results: 1. The front racing strategy is mainly affected by 200 m flying time trial rather than 500 ill record even though the front racing strategy occurs within 500 m range. 2. Maximum pedaling power performed during front racing is related to pedaling power variables from Wingate test system as well as muscle strength for squat. 3. Taken together, these data suggest that greater pedaling power including peak, mean and minimum pedaling power and good 200 m time trial record are necessary for performing an excellent front racing strategy, eventually leading to a good 200 m time trial.

HAT 무게 증가에 따른 하지 관절의 보행 전략에 관한 연구

이용식(Lee, Young-Sik),윤현(Yoon, Hyun),권문석(Kwon, Moon-Seok) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.3

The purpose of this study was to analysis gait strategy on the lower extremity biomechanics according to the added mass on HAT during the gait. The study subjects were 15 obese(weight=116.71±14.54 kg, height=1.80±0.05 m, BMI=36.00±4.20 kg/㎡), 15 normal weight(weight=66.01±2.38 kg, height=1.70±0.02 m, BMI=21.99±0.62 kg/㎡), 15 added mass HAT (weight=85.82±3.10 kg, height=1.72±0.04 m, BMI=28.65±0.80 kg/㎡), without any serious musculoskeletal problems for 1 year before the study. The peak flexion/extension moment and generated/absorbed power of the lower extremity joints were compared among obese group and normal weight group and added mass HAT group by using one-way ANOVA(p<.05). The obese walked with a lower peak extension moment of the ankle, lower peak knee extension/flexion moment than the normal weight and HAT load groups did. Additionally, the gait strategy characteristics of the obese were distinct from those of the added mass HAT groups; the obese showed a greater peak hip-generated power and lower a lower peak generated/absorbed power on ankle and knee joint.

남ㆍ여 탁구선수의 백핸드 파워 드라이브동작에 대한 운동학적 분석

이용식(Lee Young-Sik),이종훈(Lee Chong-Hun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.4

The purpose of this study was to analyze kinematic quantitative factors required to Backhand power drive in table tennis through 3-D analysis. Four national table tennis players participated in this study. The results of the study were as follows. 1) COM(Center of mass) of subject moved to forward after back swing. It allows more power and spin to the ball during impact. Low COM during back swing is considered to increase stability and allow greater accuracy. 2) Elapsed time for each phase uses reaction force of opponent’s ball. Effective back swing needs to be short and simple. 3) Resultant velocity of racket-head was the fastest at impact, it generates a greater impulse allowing more speed and spin of the ball. 4) Right knee joint angle stayed low from address to back swing position. With the beginning of forwarding movement, knee joint angle started to increase. It becomes upright posture at impact and COM shifted to the forward leg. To propel body into forward and up position, knee angle kept increasing.

정전용량을 이용한 미분탄 유량계의 개발

이용식(Yong-Sik Lee),황건호(Keon-Ho Hwang),정성원(Sung-Won Jeong),여준호(Jun-Ho Yeo),소지영(Ji-Young So),김재현(Jae-Hyeon Gim) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.4

본 논문은 발전소 보일러 및 제철소 고로의 미분탄 연소방식에 적용이 가능한 유량계 개발에 관한 연구로, 정전 용량을 이용한 미분탄 유량계를 개발하였다. 먼저 관에 흐르는 미분탄의 밀도 측정이 가능한 센서 및 회로를 설계하였고, 측정된 데이터를 분석하고 밀도를 계산하는 알고리즘을 구현하였다. 압송시스템에 설치된 로드셀의 출력 데이터와 측정된 데이터를 비교하여 개발된 유량계의 신뢰성을 확인하였다. In this paper, the flow meter system for pulverized coal is developed for the pulverizer-burner system of the boiler or the blast furnace. The sensor of the system applied the capacitance with a pair of electrode on the outer wall of the electric insulator pipe. The circuit is designed for the measurement of the granule flow density combining as a measuring electrode and a reference. In order to measure granule-flow density, the calibration curve between the weight measured from loadcell and the voltage from the circuit is created. It is verified that the flow meter system has reliability and accuracy using on-line test.

전력품질 개선기능을 갖는 PV BESS 설계

이용식(Yong-Sik Lee),서영표(Young-Pyo Seo),조호성(Ho-Seong Cho),김기석(Ki-Seok Kim),김재현(Jae-Hyeon Gim) 대한전기학회 2014 대한전기학회 학술대회 논문집 Vol.2014 No.7