평행봉 피터스 동작의 운동학적 분석

윤희중,윤창선,김태삼 한국운동역학회 2004 한국운동역학회지 Vol.14 No.2

H. J. YOON, C. S. YOON, T. S. KIM. The Kinematic Analysis of Peters Motion on Parallel bars. Korean Journal of Sport Biomechanics, Vol. 14, No. 2, pp. 15-26, 2004. The purpose of this study was to investigate the kinematic variables of peters motion in parallel bars. The subjects were 3 male national gymnasts. For this study, kinematic data were collected using video camera. Coordinate data were low-pass filtered using a fourth-order Butterworth with cutoff frequency of 6Hz. Each valuables analyzed was used to compare kinematic features between the subjects. The conclusions were as follows; 1. For a stable regrasp motion, the subjects appeared to increase horizontal and vertical displacement during the DS phase because it induce a vertical elastic of body and reaction of bar for the US phase. 2. For a stable hand standing motion of the regrasp, the subjects appeared to maintain the fast vertical and horizontal velocity during the DS phase, but in contrary during the US and Air phase the vertical and horizontal velocity appeared to do decrease. 3. When the arm lean angle and the trunk lean angle maintain a big angle during the DS phase, the subjects appeared to do a stable performance to release in a high position.

현행 중등학교 과학 실험 , 실습 교육 실태 조사 및 그 운영 진단 (Ⅱ) : 고등학교 과학 실험 , 실습 교육을 중심으로

김영호,이윤종,정원우,강용희,양승영,윤성효,안병호,윤일희,권용주,임성규,오철한,기우항,전명남,김중욱 한국과학교육학회 1998 한국과학교육학회지 Vol.18 No.3

본 연구는 96년도에 실시한 우리 나라 중학교 과학 실험·실습 교육의 실태 조사 연구에 따른 계속 연구의 일환으로 고등학교 과학 실험·실습 교육의 실태를 조사하기 위한 것이다. 연구내용은 고등학교 과학 교과서의 분석, 실험·실습 실시 현황 분석, 현행 실험·실습 교육의 문제점 분석, 현행 학교 구성원들의 실험·실습 교육 운영 실태 조사 및 현행 실험·실습 교육의 개선을 위한 연구과제 도출을 주요 연구내용으로 다루었다. 연구방법은 전국의 고등학교 80개교를 대상으로 이들 학교의 학생 1,977명, 교사 165명, 학교장 80명에게 적용하였다. 본 연구에서 밝혀진 결과를 중심으로 우리 나라 고등학교 과학 실험 실습 교육의 정상화를 위한 실험 내적인 연구과제를 제시하면 다음과 같다. (1)교재 개발에 대한 연구, (2)실험 킷트 개발에 대한 연구, (3)교사교육 및 재교육 프로그램 개발에 대한 연구, (4)교실 밖 실험·실습 활동 프로그램 개발에 대한 연구, (5)과학 실험·실습 소재의 개발에 대한 연구. This study was accomplished to analysis and survey on the experimental and practical science education of high school in korea for the consecutive study of the an analysis and survey on the experimental and practical science education of middle school in korea(Lee, Yoon-Jong et al., 1997). The status of facilities, management for the experiment, practices, teaching methods in high schools have been investigated. The present status and reasonable management of the high school science education have been grasped from the questionaires. To do this 165 high school science teachers, 1977 students and 80 principals of high schools in Korea are administered questionaires of Science Education Research Institute of Kyungpook National University(1997). The results of this study are as follows : The reasonable management for experiments and practices of science education were scanty in the high school around the urban and rural school owing to the shortage of facilities and equipments, crowded class, excessive class works for teacher, excessive contents of present textbooks and insufficiency of the administrative supports etc. The current teaching method of high school science has emphasized knowledge. This fact does not satisfy the objective of learning due to lack of the teaching method. Desirable directions for the improvement of present status of high school science education were proposed in this paper.

효과적인 항공기 사고조사에 관한 연구 : 증인 진술을 중심으로

윤승중,은희봉 한국항공대학교 1996 論文集 Vol.34 No.-

항공기 사고는 기술적인 측면에서의 비약적인 발전에도 불고하고 1970년대 중반 이후에 3에서 4%의 일정한 율로 지속되고 있으며, ICAO 통계에 의하면 2005년까지 년 20건씩 지속될 것으로 전망되고 있다. 이러한 항공기 사고는 막대한 생명과 재산상의 피해로 인하여, 다른 교통수단에 비하여 상대적으로 낮은 사고율에도 불구하고 치명적이라 할 수 있다. 따라서 사고조사의 목적은 과학적이고 논리적으로 사고원인을 규명하므로써 유사사고의 방지에 있으며, 본 연구는 특히 사고조사에 있어 물적증거와 함께 매우 중요한 부분인 증인의 증언에 관하여 문헌연구를 통하여 연구하였다. 논문의 구성은 제1장에서 연구의 목적과 구성, 방법에 관하여 기술하였으며, 2장에서는 항공기 사고의 개요, 사고의 현황에 대하여 국·내외 관련 자료를 통하여 조사하였다. 제3장에서는 사고조사의 의의와 사고조사에 관한 법률, 사고조사 과정에 관하여 연구하였으며, 제4장은 증인인터뷰에 관하여 그 의의 및 계획, 기법에 관한 내용을 기술하였다. 마지막으로 제5장에서는 이상의 연구 내용을 근거로 증인 인터뷰를 중심으로한 효과적인 사고조사에 관하여 결론을 도출하였다. The aircraft accidents have been happened at the constant rate of three to four percentage after the middle of 1970 era, in spite of well-developed technology and equipments in the civil aviation ICAO expects the twenty worldwide aircraft accidents every year until 2005. Even though, the rate of aircraft accidents is very low in comparison with the one of other transportations, the need of perfect flight safety is reuired because of the great sacrifice of life and property. Therefore, the investigation of aircraft accidents is for the purpose of preventing the analogous accident by finding out the causes of accidents scientifically. This study is organized into four part. The first part presents the summary and situation of aircraft accidents. the second part presents the meaning and process of the investigation of accidents and the third part involves the meaning, planning and technique of witness interview. The final part presents the purpose of this study for the effective investigation of aircraft accidents especially with respect of witness interview.

여자 배구 스파이크시 목적타의 거리가 운동학적 요인에 미치는 영향

윤희중,금명숙 한국운동역학회 1997 한국운동역학회지 Vol.7 No.1

The study are to examine the effects of the target distance of the body segments' kinematical variables through a use of 3-D analysis technique. The selected kinematical variables were the angle of the ankle, the knee and the hip joint at touch-down, the joint height, the center of the mass the stride length and touch down time. Four female volleyball players who engaged in the commercial team were participated in this study. Two video cameras were used for the data collection. In this study, the spiking movements were divided into two target distance (A quick, back attack) for the data analysis. From those, the selected kinematical variables were calculated, and the following conclusions were drawn ; 1. Back attack was the smaller the ankle, the knee and the hip angle at touch-down phase than A qiuck. 2. Back attack was the higher the jump height than A qiuck. 3. Back attack was the higher the center of mass than A quick. 4. Back attack was the longer stride length during approach and touch-down phase than A quick. 5. Back attack was the slower the touch-down time than A quick.

플랫서브와 스핀서브의 운동학적 분석

윤희중,정남주 한국운동역학회 1997 한국운동역학회지 Vol.7 No.1

The purpose of this study is to examine the kinematic variables during tennis flat and spin serving, and that analysis of contribution patterns of the human body segments to the racket velocity through three demensional cinematography technique. To accomplish the objective of this study, five male tennis players were used as subjects. The two cameras(Locam Ⅱ, Photosonic Biiomechanics 500) were used used to filming. The serve motions were filmed with the camera operating at 200 frames/s. The direct linear transformation(DLT) method is used in the computation of three-dimensional coordinates of the digitized body points. Coordinated raw position data through digitizing are filterd at a cutoff frequency of 6Hz using a fourth order low-pass Butterworth filter. Based on the results of this study, the following conclusions are drawn. 1) In the swing phase(toss∼impact), the flat serve is shorter execution time than spin serve. 2) At the point of impact, the flat serve is faster in the linear velocity of racket head than in the spin serve. 3) The maximum velocity of the hand is earlier to the maximum velocity of the racket head prior to impact. 4) From the angle change of each joint, shoulder angle in the flat serve and the racket angle in the spin serve are larger than any other angle. 5) The elbow joint dominate at the initial swing patterns, and the shoulder and trunk joints dominate at the final swing patterns during flat and spin serving.

제자리 점프헤딩의 운동학적 연구

윤희중,문동안,이연종 한국운동역학회 1997 한국운동역학회지 Vol.7 No.1

The purpose of present study was to clarify the kinematics characteristics of standing-jump-heading by means of three-dimensional analysis of cinematography. Twenty male students were participated in the experiment as subjects. They consisted of 10 soccer players as a skilled group, and 10 control students which did never participated in the soccer club as an unskilled group. Each subject was instructed to jump by two legs for the ball which suspended with ball-pendurum. The movements of standing-jump-heading were filmed with 16mm high speed cameras that set at perpendicular position. From the obtained results, the characteriatics of standing-jump-heading was summarized as follows 1) From comparison between skilled and unskilled groups, skilled subjects showed significantly higher practical displacements during the pre-impact and post-impact phase. 2) The velocities of head and shoulder part of the body were significantly higher in skilled subjects. But focused on the velocity of hip in subjects, negative velocity appeared, change of velocity was lower than unskilled. The higher impact velocities in skilled subjects were seemed that the head and shoulder rotated about center of gravity. 3) It is considered that acceleration at impact is substituted for developed force. Then, the accelerations of head, shoulder and hip in skilled subjects were 14.6, 2.8 and 1.4 time in unskilled subjects, respectively. It is concluded that to perform standing-jump-heading, skilled subjects made their upper bodies and heads rotate strongly about center of gravity.

평균대 경기 시 앞 공중돌기 동작에 대한 운동학적 분석

윤희중,류지선,김동민,김영란 한국운동역학회 2000 한국운동역학회지 Vol.9 No.2

본 연구는 평균대에서 수행되는 앞 공중돌기 동작의 효율적인 동작을 연기하는데 필요한 정보를 제공하기 위한 운동학적 요인을 살펴보는 데 있다. 연구대상은 부산동아시아 체조경기대회(1997년)평균대 종목별 결승에 참가한 한국선수 1명, 카자흐스탄 2명, 일본선수 1명을 대상으로 3차원 영상 분석을 통하여 운동학적 요인을 분석한 결과 다음과 같은 결론을 얻었다. 1. 각국면별 소요시간 도움닫기 시간은 스텝시간이 대상자별로 다르게 실시함으로서 수행시간간에 차이를 보였다. 도약 시간은 선행연구 결과에 비해 본 연구의 대상자들이 보다 짧은 시간을 나타냈으며, 체공시간은 길게 소요하고 있는 것으로 나타났다. 2. 체공 및 착자시 인체중심 높이는 선행연구된 마루 운동의 수행 결과들 보다는 다소 낮게 나타났다. 3. 도약시 인체중심 속도는 수직속도보다 수평속도가 높게 나타났다. 4. 도약 및 착지시 선정된 각 관절의 각도는 선행연구 결과들 보다 무릎각을 제외한 발목, 고관절 각도에서 적은 각도를 나타내 불안정한 착지를 수행하는 것으로 나타났다. The purpose of this study was to analyze the kinematic variable of a forward somersault motion in balance beam. Two video cameras were used for 3-dimentional analysis. The subjects were four female gymnasts who is participated in the '97 east asian game. The conclusions are follows. 1. Time of each phase The time of run-up was shown a difference between performance time as type of step patterns of each subjects. The time of support was display a more short time in the gymnasts of present study compared to gymnasts of previous study, and it was shown a long time in the flight phase. 3. The velocity of center of gravity in supports phase was shown more high levels in horizontal velocity than vertical velocity. 4. The angle of each joint in support and landing was display a low angles in ankle and hip joint angles except to knee joint angles. Therefore, it was performing a unbalanced landing.

세단뛰기 기록과 운동학적 변인의 주성분분석

윤희중,한희창 한국운동역학회 2002 한국운동역학회지 Vol.12 No.1

The purpose of this study was to analyze the relationship between the kinematic parameters and the record in triple jump. The subjects were sixteen male high school athletes. The motion of triple jump were filmed by using four Panasonic D-5100 S-VHS video cameras. The kinematic parameters were analyzed the rate, the horizontal velocity, the vertical velocity, flight time, take-off angle, trunk angle, thigh angle, knee angle of the hop, step and jump respectively. The conclusions of the principal factor analysis of kinematic parameters and the record triple jump were as follows; 1. The correlation over .5 between the kinematic parameters and the record triple jump was JD, III1V, SHV, JFT, HTHA. 2. In the sample correlation matrix of correlation coefficient, JD and JFT were highest(.897) and HTHA and FBSTA were lowest(-.039). 3. The eigenvalues show clearly that two common factors are present. There are two large positive eigenvalues that together account for 74% of the common variance. The scree plot displays a sharp bend at the third eigenvalue, reinforcing the preceding conclusion. 4. In the factor loading matrix, Factor 1 relates to JD, HIV, SH V, JFT, HTHA and Factor 2 relates to HTHA, FBSTA. 5. In the Rotation loading matrix, Factor 1, JD, HHV, SHV, JFT, HTHA are triple jump of jumping power, Factor 2, FBSTA is triple jump of posture angle. 6. When the factor 1 value grows larger, it recognizes JD, HIV, SHV, JFT as important and HTHA as easy, when the factor 1 value grows larger, it recognizes FBSTA as important

수직점프 수행시 두 발의 동시· 비동시 스텝에 따른 운동학적 특성 분석

윤희중,이연종,이경식,유실,정남주 韓國體育大學校附屬 體育科學硏究所 1997 韓國體育大學校附屬 體育科學硏究所論文集 Vol.16 No.1

The purpose of this study is to quantify the differences between synchronous and asynchronous step during vertical jump. The subjects of this study were 3 males college students. And 2 S-VHS vedio cameras were used for the data collection. The Direct Linear Transformation (DLT) method was employed to obtain 3-D position coordinates of 21 landmarks. And the following conclusions were drawn ; 1. Synchronous step was faster in approach velocity than asynchronous step. 2. Asynchronous step was smaller in knee flexion angle than synchronous step. 3. Synchronous step was faster in angular velocity at knee flexion than asynchronous step and asynchronous step was faster in angular velocity at knee extention. 4. Asynchronous step was higher in take-off height and loss height than synchronous step. 5. Synchronous step was higher in flight height top height and reach height than asynchronous step.

볼링 투구동작의 운동학적 분석

윤희중,이연종,금명숙 韓國體育大學校附屬 體育科學硏究所 1997 韓國體育大學校附屬 體育科學硏究所論文集 Vol.16 No.1

The purpose of this study are to examine the kinematical variables of throwing motion in bowling. The selected kinematical variables were the joint angle of lower and upper extremity at release, the length of stride, the height of center of mass, the velocity of the wrist, elbow and shoulder from stance position to release the ball. Four male bowling players in H university were participated in this study. One camera was used for data collection of 2-D DLT. The camera was located at the right side of bowler. Also a control object containing 12 markers of known coordinates encompassed the space of the throwing movement. After the selected kinematical variables were calculated, the following conclusions were drawn ; 1. The shortest stride length was showed at first step, but the longest stride length was showed at last step before release the ball. 2. The players decreased the CM at beginning of backswing, and then gradually increased the CM until end of the backswing. Also the players maintained the low CM until release the ball. 3. At release, the players maintained 55.5° of ankle joint, 135° of knee joint, 100.2° of hip joint, 20.7° of leaning body angle with extended arm. 4. The fastest movement was showed the shoulder joint at backswing, but the fastest movement was showed the wrist joint at release.