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진영완,신제민 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1
Y. W. JIN, J. M. SHIN. Biomechanical Comparative Analysis of Two Goal-Kick Motion in Soccer. Korean Journal of Sport Biomechanics, Vol. 15, No. 1, pp. 29-44, 2005. The purpose of this study is to reveal the effects of two different kicks, the drop kick and the punt kick, into the kicking motion, through the kinetic comparative analysis of the kicking motion, which is conducted when one kicks a soccer goal. To grasp kinetic changing factors, which is performed by individual's each body segment, I connected kicking motions, which were analyzed by a two dimension co-ordination, into the personal computer to concrete the digits of it and smoothed by 10Hz. Using the smoothed data, I found a needed kinematical data by inputting an analytical program into the computer. The result of comparative analysis of two kicking motions can be summarized as below. 1. There was not a big difference between the time of the loading phase and the time of the swing phase, which can affect the exact impact and the angle of balls aviation direction. 2. The two kicks were not affected the timing and the velocity of the kicking leg's segment. 3. In the goal kick motion, the maximum velocity timing of the kicking leg's lower segment showed the following orders: the thigh(-0.06sec), the lower leg(-0.05sec), the foot(-0.018sec) in the drop kick, and the thigh(-0.06sec), the lower leg(-0.05sec), the foot(-0.015sec) in the punt kick. It showed that whipping motion increases the velocity of the foot at the time of impact. 4. At the time of impact, there was not a significant difference in the supporting leg's knee and ankle. When one does the punt kick, the subject spreads out his hip joint more at the time of impact. 5. When the impact performed, kicking leg's every segment was similar. Because the height of the ball is higher in the punt kick than in the drop kick, the subject has to stretch the knees more when he kicks a ball, so there is a significant affect on the angle and the distance of the ball's flying. 6. When one performs the drop kick, the stride is 0.02m shorter than the punt kick, and the ratio of height of the drop kick is 0.05 smaller than the punt kick. This difference greatly affects the center of the ball, the supporting leg's location, and the location of the center of gravity with the center of the ball at the time of impact. 7. Right before the moment of the impact, the center of gravity was located from the center of the ball, the height of the drop kick was 0.67m ratio of height was 0.37, and the height of the punt kick was 0.65m ratio of height was 0.36. The drop kick was located more to the back 0.21m ratio of height was 0.12, the punt kick was located more to the back 0.28m ratio of height was 0.16. 8. There was not a significant difference in the absolute angle of incidence and the maximum distance, but the absolute velocity of incidence showed a significant difference. This difference is caused from that whether players have the time to perform of not; the drop kick is used when the players have time to perform, and punt kick is used when the players launch a shifting attack. 9. The surface reaction force of the supporting leg had some relation with the approaching angle. Vertical reaction force (Fz) showed some differences in the two movements(p<0.05). The maximum force of the right and left surface reaction force (Fx) didn't have much differences (p<0.05), but it showed the tendency that the maximum force occurs before the peak force of the front and back surface (Fy) occurs.
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진영완 한국운동역학회 2002 한국운동역학회지 Vol.12 No.1
The purpose of this study was to analysis the muscle moment in tennis serve. Seven Korean national tennis players were filmed using the Direct Linear Transformation method of three-dimensional cinematography. Abtained coordinate data and the model developed using Cardan angles and Euler's Equation were used to calculate the joint moments exerted on the serving arm segments(the upper arm, the lower arm, the hand). The Cardan angles between the two embedded axes of the two connected segments was used to define the anatomical motions of the segments. The anatomical motions and the joint moments of the segments were analyzed to determine the net muscle activity pattern. The conclusion of this study was the maximum liner velocity accord in the following pattern first at the shoulder joint, next at the elbow joint, then at the wrist joint, and last at the racket head. this result shows that the tennis serve has been done in a proximal to distal pattern and this is an important characteristic of the tennis serve. The joint forces and moments indicated that the eccentric activities of the antagonists were primarily responsible for this serve movement. Such antagonists activities were more apperent on the lower arm than that on the upper arm. So the coaches have to emphasize the movement of the prime proximal segment, trunk, which activate this serve movement and the control of the remained segments can be achieved naturally by the repeated training.
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재활운동기간에 따른 어깨 회전근개 수술환자의 운동역학적 연구
진영완 한국웰니스학회 2014 한국웰니스학회지 Vol.9 No.1
본 연구는 어깨 회전근개 수술환자를 대상으로 재활운동 경과에 따른 차이를 알아보고자 연구하였다. 재활운동 프로그램에 꾸준히 참가한 6명의 환자를 대상으로 2개월 시점에서 1차 실험, 4개월 시점에서 2차 실험하여 비교하였다. 통계는 paired t-test를사용하였다. 관절의 가동범위는 신전동작과 외전동작에서 통계적으로 유의한 차이를 나타내었다. 체지방량과 체질량지수는 통계적으로 유의한 차이는 없었지만 평균값의 비교에서 재활운동이 긴 4개월 시점에서 낮아지는 것을 볼 수 있었다. 근전도(EMG) 연구에서는 통계적으로 유의한 차이는 없었지만 재활운동 기간이 긴 경우에 각각의 근육 활성도가 크게 나타나는 것을 볼 수 있었다. The study aimed to analyse scientific according to passage of rehabilitation training program of rotator cuff repair. Allpatients repaired right shoulder to surgery. They attended rehabilitation training program. Experiment got a surgical operationafter 2months and 4months. Statistic used paired t-test. Range of motion at flexion and abduction were significant difference. Fatmass and BMI were no significant difference. Muscle(deltoid, trapezius, Latissimus dorsi, Pectoralis major) activation increased longterm peroid.
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진영완 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5
The purpose of this study is, fast, to compare heel angles through analyzing reaction force from the ground and also by analyzing images using force platforms through the basic motions of walking and running during a soccer game. Secondly, the purpose of this study is to clarify how each type of soccer shoes effects soccer players, which will provide scientific data to coaches and players, to further prevent injuries and to improve each players capacity. The results of this study can be summarized after testing the two types of soccer shoes with comparative transforming heel angles and also with a pressure distribution in both walking and ruining. The comparison of the very first decelerating force and accelerating force at walking found distinctive factors in the statistical data(p<.05). In the motion of stepping, the role of both offensive shoes and defensive shoes deceleration percussion force, showed distinctive factors in the statistical data(t=3.671). The comparison of accelerating shock power showed distinctive factors in the statistical data(p<.05). In comparing the shock power of deceleration(-11.25N·s), the result showed a statistically significant difference(t=2.947) in the two soccer shoes(-11.25N·s, -9.47N·s) at running(2.1m/sec). In the maximum braking force for back and forth direction, there was a statistically significant difference between the two soccer shoes(p<.05) at running(6.2m/sec). In a fast moving situation, there was a considerable difference between the soccer shoes for attacking. When a player's foot first touched the ground, the average difference of in/eversion was between 1 and 3 degrees for the two soccer shoes. In regards to maximum inversion and eversion of foot, maximum tibial rotation, and maximum and total movement of foot, the condition of barefoot and the two soccer shoes showed a small difference from 1 to 3.5 degrees and the difference among the subjects of study wasn't constant. In regards to maximum velocity of inversion and eversion running in one's bare feet showed much lower inversion velocity in comparison to putting on two types of soccer shoes and comparison of the average. Among some of the subjects, after putting on the two types of soccer shoes exceeded 100。/s in maximum velocity of eversion.
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진영완,조중생,차창일,홍남표,안회영,Jin, Young-Wan,Cho, Joong-Saeng,Cha, Chang-Il,Hong, Nam-Pyo,Ahn, Hwoe-Young 대한기관식도과학회 2000 大韓氣管食道科學會誌 Vol.6 No.1
Background and Objectives : Adenotonsillar hypertrophy is the most common disorder in pediatric otolaryngology, which should be suspected as a possible cause of obstructive sleep apnea syndrome (OSAS). In the past, most of the adenotonsillectomy were performed because of recurrent infection, but now OSAS is the most common indication in many centers. Materials and Method : A review of 1,945 adenotonsillectomy performed between 1990 and 1998 is presented. We classified into two categories of indication for adenotonsillectomy and analyzed changing trends of indication for adenotonsillectomy. Results : Although recurrent infection remains the predominant indication for surgery, there has been a rise in OSAS as a significant indication from 13.67% in 1990 to 24.26% in 1998. Conclusion : An increase has occurred in the percentage of adenotonsillectomy performed for OSAS due to adenotonsillar hypertrophy. This trend promises to continue as physicians become increasingly aware of the prevalence and seriousness of adenotonsillar hypertrophy as a cause of sleep apnea.
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