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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.
이은영(Lee, Eun-Young),서국은(Seo, Kook-Eun),정우주(Jung, Woo-Ju),데이비드 오설리번(O`Sullivan, David) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.6
The overall purpose of this study was to investigate the uselfulness of a smart good posture cushion. The study was divided into 3 separate sections. The first section was to examine the correlation between the cushion’s pressure output with the ground reaction force to validate its pressure sensor. The second section, was to investigate the repeatability of the cushion to provide feedback for anterior trunk flexion, left and right lateral trunk flexion. The third section, was to investigate the effect of using the good posture cushion on the kinematics of a participant sitting using the good posture cushion with and without its vibration feedback for 30 minutes. The results show a strong relationship between the ground reaction force and the cushions pressure. For the second section, the results highlight the large variations in feedback within and between individuals. For the third section, the results show no signification kinematic differences over the 30 minutes, however the cushion records that the participant sat in a good posture longer when provided with the vibration feedback. In conclusion, the good posture cushion may not be a perfect tool for recording deviations in sitting posture but it may be useful as a reminder for people to sit up in a better posture.
초등학교 육상남자 체육영재 선발자의 체형, 체력특성 및 상관성 분석
정은이(Jung, Eun-Yi),서국은(Seo, Kook-Eun),신상근(Shin, Sang-Keun) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.4
The purpose of this study was to analyze the simple correlation coefficient and characteristics of physical fitness and somatotype between selected boys and non-selected boys in athletics talents in order to provide scientific basic data for athletic training. The subjects of study were 56 boys composed of selected talents(n=30) and the non-selected talents(n=26) that have participated. The subjects were elementary school boys (grade 1 to 3) from Busan, Ulsan and Gyung-Nam province. The variables of 6 somatotype and physical fitness were measured using KOSTASS(Korea Sport Talent Search System developed by Korea Institute of sports science, 2007) in all the subjects before the start of the training program. The alpha level of p<.05 was set for all test of significance. The results of this study are as follows; 1. In the average somatotype, the selected talents were mesomorph-ectomorph (=2.8-3.7-3.4) and non-selected talents were mesomorph-endomorpht =4.1-4.1-2.9). 2. In the differences among physical fitness variables between the selected talents and non-selected talents, throw ball, sit-up, half-squat jump, 50m run(p<.05), standing long jump(p<.01) were significantly. 3. In the correlation between somatotype and physical fitness, Half-squat Jump was a significant negative correlation(p<.05), 1,000m Run and Walk was significantly correlated(p<.05) in endomorphic component. In the correlation between mesomorphic component which characterizes muscle and bone development and ectomorphic component on the degree of lean person and physical fitness was no correlation. According to the results of the study, the selected talents showed lower endomorphic component but higher ectomorphic components and mesomorphic component than the non-selected talents in the classification of H-C and the selected talents showed higher than the non-selected talents in the physical fitness.
남자 테니스 선수들의 양손 백핸드 동작 시 스탠스에 따른 어깨와 힙 수평회전에 관한 운동학적 비교 분석
임형준(Lim, Hyung-Joon),서국은(Seo, Kook-Eun),강영택(Kang, Young-Taek),박태진(Park, Tae-Jin) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.5
The purpose of this study is to analyze and compare the kinematic variables of the trunk in order to investigate the differences between stance types during the two-handed backhand motion of male tennis players. This will provide quantitative data to assist precise and efficient instruction by determining reference points of position, enhanced performance and skill.In order to achieve these objectives, six male players were selected at a national athletics meeting, and the mean difference between their kinematic variables during a two-handed backhand stroke was studied using three-dimensional motion analysis. The paired t-test was used to compare the stance types, and a one-way ANOVA was used to compare the phase at the time of swinging. Through this process, the following conclusions were obtained. In the backswing phase, the maximum horizontal rotation of the shoulder and hip joints from an open stance is faster than that from a square stance. However, trunk coiling begins at the same time for both stances. In the backswing phase, the maximum horizontal rotation of the shoulder and hip joints in a square stance occurs more often than in an open stance, but the angle of trunk coiling in the open stance is larger than that in a square stance.
남자 볼링선수들의 투구동작 시 구질에 따른 운동역학적 분석
이미경(Lee, Mi-Kyoung),서국은(Seo, Kook-Eun),양정옥(Yang, Jeong-Ok),박태진(Park, Tae-Jin),신상근(Shin, Sang-Keun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.6
The purpose of this study was to investigate the kinetic factors of the straight, hook, curve of throwing motions in bowling according to the three pitches of male bowlers and to provide the basic data of consistent throwing motion techniques and instructions. Six male bowlers in B city were participated in this experiment and their pictures were taken with 3-D image analysis. All data were presented by analyzing the mean time of each phase, the range of angle and gravity, the pattern of throwing, the mean of velocity during release motion, and the angular momentum. The results were as follows: In the male bowlers’ throwing motions ‘Of three pitching speed - straight, hook, and curve, for the at the release, curve was rapid than the straight or the hook. In the male bowlers’ throwing motions of three - straight, hook, and curve, for the angular momentum by event, the antebrachial angular momentum tended to increase gradually over the angular momentum of the trunk of body and humerus. In conclusion, in the male bowlers’ throwing motions of three pitches - straight, hook, and curve balls, it is crucial to secure the stability leftward and rightward in the movement range of the center of gravity, to preserve the low posture upward and downward right before the release point, and to increase the antebrachial angular momentum.
워블보드 운동과 윈드서핑 운동이 외발서기 시 COP와 COM에 미치는 영향 비교
신승우(Shin, Seung-woo),서국은(Seo, Kook-Eun),양승호(Yang, Sung-Ho),정의태(Jung, Eui-Tay),박태진(Park, Tae-Jin) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.2
This research was to analyze the impact of wobble board and wind surfing to static balance ability targeting 22 male students who were divided into groups. Each group composing 11 participants were trained for 6 weeks and conducted ground reaction force and image analysis. Using spss 21.0, evaluation of differences within groups before and after the exercise was paired t-test, and Independent t-test was performed by calculating %diff values of before and after the exercise for the difference and signification was set as α=.05. The research resulted that while standing with one-leg keeping eyes open, the change of distance and moving range centered to pressure and mass after the two group’s training was decreased. Right/Left distance and area focused on pressure while keeping eyes open was decreased significantly in windsurfing group. In the comparison according to time information among groups, right/left moving distance based on pressure was significantly decreased in wind surfing group. Preformed environment of wind surfing and wobble board is not different, but it was revealed that proprioception was stimulated due to its unstable supporting surface and this affects positively to static balance. In the kinetic analysis, wind surfing was discovered to have better effect than the other one.