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테니스 포핸드 드라이브 스트로크 시 스탠스 형태에 따른 어깨, 힙, 무릎의 수평회전 차이에 관한 비교분석
정용민(Chung, Yong-Min),강영택(Kang, Young-Taek),서국은(Seo, Kuk-Eun) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.2
The purpose of this study was to analyze the difference between stance types and the horizontal rotation of shoulder, hip, knee during a forehand drive stroke. Six male high school players were the subjects, and the mean difference among the kinematic variables such as the angles of lower limbs joints, angles of segment horizontal rotation, trunk coiling of back swing, phase of the back swing movement and forward swing in a forehand stroke through a three-dimensional motion analysis. The test data was analyzed by a paired t-test, and the alpha level of a=.05 was set for all tests of significance. The findings of the study were as follows; First, there was no difference in the total angles of lower limbs joints from the ready position to follow-through. Second, there was no difference in the horizontal rotation angle of shoulder but the horizontal rotation angles of hip E1, E2, knee E1, E2, E3 was different between the two stance. Third, there was no difference in the trunk coiling angle of the shoulder’s maximum horizontal rotation but hip and knees was different. There was difference in the angle of trunk coiling; the open stance of in the shoulder-hip and in the shoulder-knee. But the hip-knee no was different in the two stance.
Tennis Forehand Topspin Stroke의 역학적 분석
서국웅,박순자,서국은,이중숙,이훈식 釜山大學校 附設 體育科學硏究所 1991 體育科學硏究所 論文集 Vol.7 No.-
The aim of this treatise is to give some help to the beginners and in structors in understanding to importance and the Kinematics and Kinetics of forehand topspin stroke by providing them with the results obtained from the comparative analysis of the forehand topspin stroke movements. To carry out this study, one male and female university students were selected as subjects and they are A, B : A and B are skilled players with over 10 Years of experience(A: male B: female) And many pictures of the subjects in forehand topspin stroke were taken with 16mm high speed camera(250fps) and they were analyzed with a film motion analyzer on the phase of the locus the strobo, the displacement, the velocity, the force, the momentum, the energy, the power. The following are comparative analysis data of the racket movement of each subject in forehand topspin stroke: 1. In case of male player, the movement of the center of gravity and the ball control are stable but, the power decrease. 2. In case of female player, in the state of back swing potential energy and acceleration was higher, and the strong power made but ball control had some problems in beginners but the excellerant player showed the merit point. 3. In the performance of forehand topspin stroke, it is recommended that one should have the habit of getting a adequate swing practicing form based upon individual physical characteristics rather than heightening the velocity of swing.
서국웅,윤양진,서국은,이중숙,김용재,이언석,이훈식 釜山大學校 附設 體育科學硏究所 1992 體育科學硏究所 論文集 Vol.8 No.-
The purpose of this study was to analyze walking steps to prevent unnecessary energy consuming and prevention of injury from sliding when someone was walking. The questionnaire, high speed video system, E.M.G. system, and force platform system were used to analyze sliding mechanism in biomechanical perspective. Several results were found as following: 1. According to questionnaire regarding sliding, 93.3% of participants have sliding experiences. People have sliding experiences by greasy floor(48.4%) and obstacle (22.5%). Sliding types were found from different kinds of shoes such as sneakers (48.8%) and boots (34.2%). The results were presented as following 44.6% of participants were fall down front direction and 40.3% of people fell down rear side. 2. According to the high speed video system analyzer, step sliding increased with increasing step speed from distance and acceleration speed experiment with 80 steps/min, 100 steps/min, 120 steps/min. Also, the most sliding were occurred with sneakers, boots, and bare feet as order. 3. According to E.M.G. test results, the vastus lateralis M., the vastus medialis m., and the tibialis anterior m. of electric action potential presented strongly when participants fell front, rear, and right side. The vastus lateralis m. and the tibialis anterior m. of electric action potential presented strongly when someone fell left side, but the vastus medialis m. and the gastrocnemius m. of electirc action potential presented as weaker. 4. According to the force platform test results, the most big change of floor antipower of x-axis presented when someone fell the left side. The most of big change of floor antipower of y-axis presented when someone fell down rear side. The most of big change of floor antipower of z-axis presented similarly when someone fell the front, rear, left, and right side.
徐國雄,徐國殷 釜山大學校 附設 體育科學硏究所 1986 體育科學硏究所 論文集 Vol.2 No.-
The result of being analyzed the biomechanical factors as to Crawl Stroke can be summarized at follows: 1) Force of gravity and force of buoyancy act upon an object in water at the same time. And the interrelation of the power between these forces decide whether this object keeps afloat or sink on the water. 2) The resistive force acting upon Crawl Stroke can be classified into surface drag, form drag, and wave drag. It is needed how these drags should be lowered. 3) The propulsive force of Crawl Stroke is chiefly formed in the arm. So the propulsive force is made by drag component and lift component when the arm is moved backward. 4) The arm motion of Crawl Stroke is classified into entry, support, catch, pull, push, release and recovery. 5) The leg motion of Crawl Stroke is similar to the fin motion of fish. The propulsive force in beating upward stronger than in beating downward. 6) An effective breathing must be done with keeping a basic posture in order to meet with less resistance. 7) Much stronger propulsive force can be made if the arm motion, the leg motion, and breathing method combined well one another.
徐國雄,白永鎬,徐國殷 부산대학교 1983 자연과학논문집 Vol.36 No.-
This study was executed so as to analyze the correlation among the general motor ability. The subjects were 83 man college athletes(42 ball game players and 41 match game athletes) as a experimental groups and 69 non athletes as acomparative groups. The test period was from september 5, 1983 to september 15, 1983. The results were as follows. 1. The actual condition of the general motor ability between the group. (1) In case of ball game athletes. The volleyball players had shown a good scores which was 55.85±8.08 in the trunk extension. Rugby players had shown a good scores which was 9.44±2.55 in the chinning, 255.88±9.62 in the standing broad jump and 7.40±3.62 in the stick test. Handball players had shown a good scores which was 137.00±16.63 in the back strength and 9.84±0.47 in the shuttle run but basketball players had shown a bad scores in the other total items. (2) In case of match game athletes , Tae Kwon Do athletes had shown a good scores which was 240.78±13.00 in the standing broad jump, wrestling athletes had shown a good scores which was 17.93±9.50 in the chining, and 5.19±2.30 in the stick test and Judo athletes had shown a good scores which was 124.92±17.83 in the back strength and 10.18±0.34 in the shuttle run. (3) In case of non athletes, Non athletes had shown a bad scores more than any other athlete. 2. The correlation among the general motor ability between the groups. (1) In case of ball game players, standing broad jump had been shown a little correlation with back strength (r=0.3519), chinning (r=0.4811) and trunk extension (r=0.3665). And it had been shown little correlation with that others. (2) In case of match athletes, Chinning and standing broad jump(r=0.3577) had been shown a little correlation as well as chinning and stick test. Shuttle run and standing broad jump (r=-0.5961) had been shown much higher correlation. (3) In case of non-athletes, Chinning and standing broad jump (r=0.3917) had been shown a little correlation as well as shuttle run and stick test (r=-0.3571). Shuttle run and standing broad jump (r=-0.4918) had been shown much higher correlation. (4) As a whole, Back strength and shuttle run (r=-0.3918) had been shown a little correlation as well as shuttle run and standing broad jump. 3. A regressive equation between standing broad jump and other items among the groups. (1) In case of ball game players, Y=+0.14 X-28.37 had been acquired in the relation with the standing broad jump and chinning (r=0.4811). (2) In case of match game athletes, Y=-0.02 X+13.9 had been acquired in the relation with the standing broad jump and shuttle run (r=-0.5661). (3) In case of non athletes, Y=-0.02 X+15.78 had been acquired in the relation with the standing broad jump and shuttle run (r=-0.4917).