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.

임신 40주와 출산 후 6주에 있는 20대 임산부 보행의 역학적 특성 비교

윤희중,문동안,정남주,금명숙,이경식,유실,김영란,한윤수 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1

본 연구는 임신 40주와 출산후 6주간에 있는 임산부의 보행 동작의 특정을 규명함으로써 이와 관련된 연구자들에게 기초자료를 제공하고자 실시하였다. 이를 위해 임신 4주에 있는 임산부를 대상으로 1차 실험을 실시하였으며 동일한 대상자를 출산후 6주에 2차로 실험하여 자료를 수집하였다. 디지타이징 시 오차를 최소화하고 인체관절점의 분별을 위해 21개의 반사마커를 부착하였다. 10m의 보행주로를 걷는 동안 두 대의 비디오카메라를 이용하여60Hz로 자료를 수집하였으며 동시에 100Hz 지면반력자료를 수집하였다.수집되어진 자료는 DLT 방법을 사용하여 분석하였으며 이의 분석에 Kwon3d 프로그램을 활용하였다. 분석결과 다음과 같은 결론을 얻었다. 1. 임신 40주와 출산 후 6주의 보행 시 지지시간과 스윙시간의 비율이 다르게 나타났으며 보폭과 보간, 활보장은 임신 40주에서 더 큰 값을 보였다. 상체 전경각 역시 임신 40주에서 더 큰 값을 보였다. 힙관절, 무릎관절, 발목관절각도는 S1이 출산후 6주에서 큰 값을 보인반면 S2는 출산전후에 큰 변화를 보이지 않다. 2. 상하지면반력의 경우 FP1과 FP2는 임신 40주보다는 출산 6주에서 큰값을 보였지만 FP3는 임신 40주에서 보다 큰값을 보이고 있었다. 전후지면반력의 경우 출산전과 후 모두 Fy2에서 보다 큰 값을 보이고 있었다. This Study was to investigate kinematical characteristic comparison of the gait pregnant 40weeks and after delivery 6weeks 20´s women and provide the basic data. To accomplish this study, in the first, carry out an experiment with the pregnant women in the pregnant 40weeks on the videotape, and than the second, make an experiment with the kinematic data. Kinematic data were filtered with a low-pass, fourth-order Butterworth filter with an effective cut off frequency of 6Hz. The conclusions were drawn as follows; 1. Floor contact Periods(stance and swing rate) were differed from before and after the delivery and a pregnant 40 weeks was greater than after delivery 6 weeks in the step, width, stride. Also, a pregnant 40 weeks was greater than after delivery 6 weeks in the front angular. And the other angular components were represented similar pattern. 2. In the vertical load, delivery 6 weeks was grater than a pregnant 40 weeks in the FP1(first peak) and FP2(valley). And FP3(second peak)was represent that a pregnant 40 weeks was greater than delivery 6 weeks. Also, in the horizontal shear, Fy2(progressional force)was greater than Fy1(breaking force) about time of the delivery.

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.

육상 단거리 차렷 자세 동작에서 팔 넓이가 운동학적 요인에 미치는 영향

윤희중,장영섭 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1

본 연구는 육상 단거리 차렷 자세 동작에서 팔넓이와 출발 동작의 운동학적 요인과의 관계를 규명하는데 그 목적이 있다. 이를 위하여 2000년 현재 선수등록이 되어 있는 대학 · 실업 선수 5명을 선정하였으며, 평상시 취하는 팔넓이에 ±2.5㎝를 계산하여 실험을 실시하였다. 이를 두 대의 비디오카메라로 녹화하여 DLT 기법을 통하여 3차원영상분석을 실시한 후 각 요인들을 분석한 결과 다음과 같은 결론에 도달하였다. 1. 인체 중심의 이동 변위는 저자세(-2.5m), 중자세 그리고 고자세(+2.5m) 순으로 가장 많은 이동 변위를 나타냈으며, 국면별로는 3국면, 1국면 그리고 2국면 순으로 많은 이동 변위를 나타냈다. 2. 보폭은 저자세(-2.5m), 고자세(+2.5m) 그리고 중자세 순으로 긴 보폭을 나타냈으며, 구면별로는 3국면,1국면 그리고 2국면의 순으로 많은 이동 변위를 보이고 있었다. 3. 인체 중심 이동 소요 시간은 중자세, 저자세(-2.5m) 그리고 고자세(+2.5m)순으로 빠르게 나타났다. 4. 인체 중심과 몸통의 순간 속도는 중자세와 저자세에서 빠르게 나타났다. 5. 발분절의 순간 속도는 고자세(+2.5m), 저자세(-2.5m) 그리고 중자세 순으로 빠르게 나타났다. 6. 몸통의 각도는 고자세(+2.5m)에서 몸통을 가장 많이 숙이는 것으로 나타났다. The purpose of this study is to investigate the relationship between the width of the arm joint at attention and displacement, time, angle and velocity factors of starting motion for male sprinters. 2 S-VHS video cameras were used for the data collection. The following conclusions were drawn : 1. In the displacement of CG according to width of the arm joint was shown longest displacement in low position(-2.5㎝) medium position and high position(+2.5㎝), By the phase, it was shown longest diplacement in 3 phase, 1 phase and 2 phase. And in the height of CG was alike form of change. But medium position was shown faster form of change than other position. 2. In the length of stride was shown longer in low position(-2.5㎝), high position(+2.5㎝) and medium position. By the phase, it was shown longest displacement in 3 phase, 1 phase and 2 phase. 3. In the time of CG was shown shorter in medium position, low position(-2.5㎝) and high position(+2.5㎝). 4. In the velocity of CG and trunk was shown faster in low position(-2.5㎝) and medium position. 5. In the velocity of the foot segment was shown faster in high position(+2.5㎝), low position(-2.5㎝) and medium position. 6. In the angle of trunk was shown smallest angle in high position(+2.5㎝).

Rings운동에서의 Giant swing동작에 대한 운동학적 분석

윤희중,박종훈,한충식,김영란,김충태 韓國體育大學校附屬 體育科學硏究所 1992 韓國體育大學校附屬 體育科學硏究所論文集 Vol.11 No.1

This study was to investogate the kinematic patterns of the giant. swing on rings by 3 male gymnastic. The motion was filmed at 60frame/sec high video camera. The result was as follows ; 1. Subj. C showed a large displacement in the wrist J. at phase I and Subj. B showed a large displacement at phase 2, 3, 4. 2. Subj. C showed a large displacement in the hip J. at down swig phase and Subj.B, C showed a large displacement. at upward swing phase. 3. Subj. A showed a large velocity a in the hip J. at phase 1 and Subi. C shooed a large velocity at phase 2, 3, 4. 4. Subj. C showed a large velicity in the shoulder J. at whole phase. 5. Subj. C showed a large angular velocity in the hip J. at down swing phase and subj. B showed a large angular velocity at upward swing phase. 6. Subj. B showed a larege angular velocity in the shoulder J. at. phase 1, and Subj. C showed a large angular velocity at phase 2, 4 also subj. A showed a large angular velocity at phase 3.

한국과 C.I.S 우수 레슬링 선수들의 엉치걸이 동작에 대한 운동학적 요인 분석

윤희중,전해섭,김동건,김영란 韓國體育大學校附屬 體育科學硏究所 1992 韓國體育大學校附屬 體育科學硏究所論文集 Vol.11 No.1

This study investigated kinemtic factors of hip throw as a representative skill to make a comparative study between Korean and C. I. S wrestlers Four elite wrestlers were filmed using high - speed cinematography. Kinematic data for the each phase were derived from the digitized film. Analyzing variables included center of gravity(CG) displacement and velocity, hip joint, angular displacement and angular velocity The results were as followers ; 1. Elapse time of CG at conducting hip throw were showed similar result between two nations. 2. C. I. S wrestlers showed more displacement than Korean wrestlers in the harizontal phase (P<0.001) but, Korean wrestlers showed large movemnet, in the vertical phase(P <0.001). 3. In average velocity at whole phase, Korean wrestlers showed rapid velocity in the vertical phase(P<0.001) but, C. I. S wrestlers at conducting throw partner down showed rapid velocity in the horizontal phase(P<0.05). 4. C. I. S wrestlers showed large angular displacement in the hip joint at Ph. I. (P <0.001). 5. C. I. S wrestlers showed rapid angular velocity in the hip joint at Ph. I (P<0.001).

테니스 포핸드 발리와 백핸드 발리의 운동학적 분석

윤희중,강관희,김태삼 한국체육대학교 체육과학연구소 2000 韓國體育大學校附屬 體育科學硏究所論文集 Vol.19 No.1

This study is to analyze the kinematic variables of forehand and back- hand volley in tennis. Five male tennis players are used as subjects, two S-VHS video cameras set in 60frames/sec were used for recording volley motion. Coordinated raw position data through digitizing are smoothing by low-pass Butterworth filtering method at a cut off frequency 6Hz, and the direct linear transformation(DLT) method was employed to obtain 3-D position coordinates. The conclusions were as follows; 1.In the swing time, forehand volley was longer than backhand volley in phase1, but forehand volley was shorter than backhand volley in phase2, forehand volley was shorter than backhand volley in the total swing time. 2.Backhand volley was longer than forehand volley in displacement of Y axis direction and the height of CG was similar to the forehand and backhand volley in total swing phase. 3.At the point of impact, the resultant velocity of racket head was similar to the forehand and backhand volley, and the maximal resultant velocity of racket head occurred before impact. 4.In the angle of the frontal trunk, the wrist and the knee, forehand volley was larger than backhand volley in each event, and each segment angle increased before impact to except the wrist angle of backhand volley. 5.In the angular velocity of the wrist, forehand volley was positive addition and backhand volley was negative addition at impact.

도마 Yeo2동작에 대한 운동학적 요인 분석

윤희중,여홍철,김태삼 한국운동역학회 2001 한국운동역학회지 Vol.11 No.1

The purpose of this study was to investigate the effect of the kinematic factors about event of the Yeo2 motion on the Horse Vault. The subject in this study was 1 male gymnast to performance Yeo2 motion. Two video cameras were used to attain kinematic variables by phase. As a result, the following conclusion was drawn; 1. As the take-off time on the board was short, it appeared to increase horizontal and vertical velocity. In the motion, the flight apex height increased largely, too. 2. As the contact time on the board was short, it appeared to performance the air motion smoothly by increasing the horizontal distance and apex height. 3. The horizontal and vertical velocity in take-off on the board appeared increase horizontal distance and apex height. 4. To increase the apex height and horizontal distance, the body appeared to must be take the posture of vertical axis in take-off on the board.