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여자 테니스 선수의 양손 백핸드 스트로크 동작시 상지의 근전도 분석
유국종,서국웅,윤양진,이훈식,정미라,서국은 한국운동역학회 2000 한국운동역학회지 Vol.9 No.2
This study analzed AEMG, muscle activity duration time, peak value and work load of six high school student players, three college student players, three business team players in order to analyze Arm's EMG when they play games with two-handed backhand stroke. The instruments of measuring EMG are muscle tester ME3000p. And measured parts of muscle are the triceps brachii, biceps brachii, brachioradialis and flexor carpi radialis of body left and right arm. The following is the result according to the analysis of raw data and statistics. 1. The AEMG of trained group was higher than the untrained. In both groups AEMG of right arm was higher than left one. And AEMG of forearm was higher than upperarm. The order of high AEMG among the trained is as followed ; right biceps brachii, left brachii, right brachioradialis. Among the untrained ; right brachioradialis, left brachioradialis, biceps brachii. 2. The muscle activity duration time of the trained group was totally shorter than the untrained. In both groups muscle activity duration time of the right arm was shorter than the left one. As to trained muscle activity duration time of upperarm is shorter than the forearm. Contrarily, as to untrained muscle activity duration time forearm is shorter than the upperarm. The order of short muscle activity duration time among the trained is as followed ; right biceps brachii, triceps brachii, left flexor carpi radialis. 3. The peak value of trained group was higher than the untrained. In body groups peak value of the right arm was higher than the left one. As to the trained the peak of the upperarm is higher than the forearm. Contrarily, as to the untrained, the peak value of the forearm was higher the upperarm. The order of high peak value among the trained is as followed ; right biceps brachii, left biceps brachii, right brachioradialis. Among the untrained, right brachioradialis, left biceps brachii, brachioradialis.
서동석,이종국,이은구 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.2
TiO₂ powders were prepared via the sol-gel method using titanium alkoxide. The process for the preparation of TiO₂ powder was studied as a functuion of the molar ratio of water to alkoxide. Microstructure, crystallization behaviour with heat treatment temperature, specific surface area, and particle size were examined using SEM. X-ray diffraction. TG/DSC, BET, and particle size analyser, respectively. The TiO₂ powders showed slightly agglomeration less than 0.5㎛ and the powders transformed amorphous to anatase phase at 450℃.
이훈식,서국웅,윤양진,정미라,김용재,서국은,이중숙 한국운동역학회 2000 한국운동역학회지 Vol.9 No.2
The purpose of this paper is to select 7 male athletes and female athletes of high school, and to compare their active potential differences of upper arm muscles according to characteristic of a racket. the results obtained are as follows: 1. In the accumulative distribution rate of racket string tension, 65Ibs is higher in all muscle active potentials except male flexor carpi radialis muscle than 55Ibs or 60Ibs, and this result shows that 65Ibs gives lower efficiency to athletes. 2. In the muscle load rate of racket string tension, 55Ibs shows the lowest active muscle potential and is thought to be better in its efficiency, but 66Ibs shows a little high active potential and is thought not to be good in its efficiency.
퍼팅 동작 영상분석 시 프레스 동작의 이벤트 설정 가능성 여부
박태진,서국웅,서국은 釜山大學校 附設 體育科學硏究所 2009 體育科學硏究所 論文集 Vol.25 No.1
본 연구는 부산.경남지역에서 세미프로로 활동 중인 7명을 선정하여 퍼팅(10.94 m)동작 시 프레스 동작을 3차원 영상 기법을 통해 운동학적으로 비교.분석하여 얻은 결론은 다음과 같다. 첫 번째, 양손은 어드레스를 취한 후 백스윙되기 전까지 볼 진행 방향으로 움직이는 것으로 나타났다. 두 번째, 퍼터헤드, 몸통, 어깨 중심점은 프레스 동작 시 좌.우 방향으로 움직이지 않고 고정되어 있는 것으로 나타났으며, 프레스 시 양손 중심점은 어드레스 시 보다 임팩트 시에 가까운 것으로 나타났다. 세 번째, 퍼팅 스트로크 시 총소요시간 중 프레스 동작이 22.83%를 차지하고, 구간 중 다운스윙과 팔로스루 시간 보다 많이 소요되는 것으로 나타났다.
윤양진,유국종,서국웅,정미라,강영택,이훈식,서국은 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-
The purpose of this paper is to select 7 male athletes and female athletes of high school, and to compare their active potential differences of upper arm muscles according to characteristic of a racket. the results obtained are as follows: 1. According to the accumulative distribution rate of racket material, graphite and wood material show better efficiency in case of brachio radialis muscle of male athletes, but the racket material shows no constant efficiency in brachii radialis muscle of female athletes. In case of flexor carpi radialis muscle, wood material provides better efficiency only for male athletes. In case of triceps brachii muscle, wood material gives better efficiency to males athletes and steel material gives better efficiency to females athletes. Especially in case of biceps brachii muscle, neither male nor female athletes are influenced by racket materials at impact. 2. In the muscle load rate according to racket material, wood has the highest muscle active potential and graphite has the lowest active potential. Therefore, graphite is thoght to be better in the efficiency of muscle load rate.
테니스 양손 백핸드 드라이브 스트로크 시 볼 방향성에 따른 수평회전운동 비교분석
서국은 ( Kook Eun Seo ),정용민 ( Yong Min Chung ),강영택 ( Young Taek Kang ) 한국운동역학회 2015 한국운동역학회지 Vol.25 No.3
Objective : The purpose of this study was to compare the kinematic data of the horizontal rotation movements of shoulder, hip, knee during two-handed backhand drive stroke according to two different ball directions. Methods : The kinematic variables were analyzed such as the joint angles of the lower body, horizontal rotation angles of the shoulder, hip, inter-knee segment, body twist angle and difference in angle of forward swing. Two-handed backhand drive stroke was analyzed through a three-dimensional motion analysis. The collected data were analyzed by a paired t-test, and the statistical significant value was set at α=.05. Results : The findings of this study were as follows; First, there was no difference in the total angles of lower limb joints from the forward swing position to impact posterior. Second, there was no difference in the horizontal rotation angles of E1 shoulder, hip, and E2 shoulder but the horizontal rotation angles of E1 knee, E2 hip, knee, E3, and E4 shoulder, hip, and knee were different in all events. Third, there was no difference in the body twist angle of the maximum horizontal rotation. In addition, there was no difference in the angle of the body twist by the ball direction in the shoulder-hip, the hip-knee and the shoulder-knee. Conclusion : Horizontal rotation angle determines ball directions.
테니스 양손 백핸드 스트로크 시 스웡타입에 따른 라켓헤드속도와 라켓 면각도 비교분석
서국은(Seo, Kook-Eun),강영택(Kang, Young-Taek) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.6
The purpose of this study was to analyze the difference between swing types during a open stance and to enhance performance and skill. Six male university players were the subjects, and the mean difference between the kinematic variables such as the velocity of racket head, X, Y, Z components velocity of racket head, angle of racket face in a two-handed backhand stroke through a three-dimensional motion analysis. The test data was analyzed by a paired t-test, and the alpha level of α = .05 was set for all tests of significance. The findings of the study were as follows; First, there was difference in the velocity of racket head to E2, E3, E4 event of the two swing types during the open stance. Second, there was difference in the drive swing to x components velocity and the top spin swing to z components velocity between the two swings types during the open stance. Third, there was no difference in the angle of racket face of the two swing types during the open stance.