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RISS 인기검색어
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- 저자 : 정철수 ( Kyu Chan Lim (검색결과 5 건)
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테니스 포핸드 스트로크의 포워드 스윙에서 multisegment 스윙과 single unit 스윙의 라켓 속도에 대한 기여도 비교에 관한 연구
임규찬,정철수 師範大學 體育硏究所 1993 서울大學校 體育硏究所論集 Vol.14 No.2
The purpose of this study was to compare the contribution to the speed of the racket of multisegment and single unit forehand stroke during forward swing in tennis. Each one skilled subject was filmed with three-dimensional cinematography, and after the film analysis procedure using the Direct Linear Transformation method, the factors contributing to the speed of the racket in each subject were obtained. The following conclusions were reached: 1. The typical difference of the preimpact speed of the racket between the multisegment swing and the single unit swing was not found, but each swing pattern was inclined to be different. 2. Concretely, the shoulder and elbow joint dominated the multisegment initial swing pattern, and the trunk rotation and elbow joint dominated the multisegment final swing pattern. Especially, the somersault component of the upperarm rotation dominated the upperarm initial swing pattern, and the twist component dominated the upperarm final swing pattern. 3. The shoulder and elbow joint dominated the single unit initial swing pattern, and during the intermediate phase the trunk rotation and elbow joint dominated the single unit swing pattern, finally the shoulder joint and the trunk rotation and the elbow joint dominated the single unit final swing pattern. Especially, the twist component of the upperarm rotation dominated the upperarm initial swing pattern, and the somersault component dominated the upperarm final swing pattern.
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임규찬,정철수,이만기 師範大學 體育硏究所 1994 서울大學校 體育硏究所論集 Vol.15 No.2
This study was conducted to investigate the biomechanical characteristics of the interval running motions in elite hurdlers for the purpose of improving horizontal velocity. Here, interval running was divided into preparatory phase, hurdle phase, landing phase, and recovery phase in turn. The subjects were six males who were included in one current Korean national player. The interval running motions were filmed using four 16mm cameras. The motions were analyzed using the DLT (Direct Linear Transformation) method of three-dimensional cinematography. The conclusions were as follows; 1. In order to maintain the horizontal velocity, specially the spent time of hurdle phase should be decreased. 2. In order to maintain the horizontal velocity, the body c.o.g should be raised specially at the touch-down of hurdle phase and landing phase. 3. In order to maintain the horizontal velocity, specially the step length of landing phase and recovery phase should be increased. 4. In order to maintain the horizontal velocity, the active landing style should be performed as the sole of foot might claw the ground. 5. In other to delay the generation of the vertical velocity, knee flexion should be maintained until trail leg comes to the recovery phase. 6. In order to perform the hurdling motion efficiently, an optimal take-off angle should be kept up, and the body lean angles should be increased forward. 7. In order to decrease the airborne time, abduction and internal rotation of hip joint should be completed immediately before the clearance, and horizontal adduction should be advanced quickly immediately after the clearance.
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임규찬,박윤서,배성제,정철수,신인식,김복영 師範大學 體育硏究所 1994 서울大學校 體育硏究所論集 Vol.15 No.2
This study was conducted to investigate the biomechanical characteristics of the gait pattern in an amputee for the purpose of improving the proper gait posture and designing the prosthetic. The subjects were six males amputees and one normal person. The ground reaction force was measured using AMTI force platform. The conclusions were as follows; 1. In case of amputee group, the ground reaction force was revealed in specific figure according to position in which they used the prosthetic, whereas in case of normal person the ground reaction force was revealed in the figure of two humps in regard of vertical axis. 2. In case of amputee group, the ground reaction force in time between fight foot contact and left foot contact was deviated from a figure of rectangle, whereas in case of normal person the ground reaction force was revealed in the figure of rectangle. 3. In case of amputee group, the ground reaction force referred to both feet angle point of view was revealed in irregular figure, whereas in case of normal person the ground reaction force was revealed about 47。
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멀리뛰기 발구름 동작시 아킬레스건각이 도약속도와 도약각도에 미치는 영향
김복영,배성제,신인식,정철수,임규찬 師範大學 體育硏究所 1992 서울大學校 體育硏究所論集 Vol.13 No.2
The purpose of this study was to investigate the effect of lower leg planting angle an on take-off motion of the long jump. The Achilles tendon angle defined as the angle between shank and calcaneus with projection to XY plane was introduced to interprete lower leg motion uring last foot touch for the flight phase of long jump. A typical high speed film analysis technique including DLT method was adapted to record and analyze total of nineteen long jumps performed by elite athletes at two different track and field events. The following were found that: 1. The relationship between touch-down velocity, take-off velocity, range of vertical velocity and flight length were significantly related each others as r=0.6383, 0.6395 respectively at t=0.01 level. 2. It was not possible to reveal the relationship between take-off angle and flight length. Due to highly consistent take-off angles shown between the long jumpers. 3. The angular displacement of the shank during the last foot contact just before flight phase was negatively related to the flight length(r= -0.6149). However, it was not possible to find the relationship between the aehilles tendon angle and flight length. 4. As the range of the body C.O.G lean angle increased the last step foot contact time significantly increased(r=0.8625). 5. The foot contact time of Korean elite long jumpers was somewhat longer than that shown by foreign Athletes. It is concluded that maintaining touch-down velocity during initial phase of foot touch and increasing take-off velocity would result optimal take-off angle and good record. Decrease in the angular displacement of the shank, foot contact duration, and the range of body C.O.G lean angle were found to be important to improve the flight length.
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