인암(仁庵) 정철정(鄭哲正) 교수(敎授) 정년퇴임(停年退任) 기념(記念)

정철정 ( Chul Jung Jung ) 한국운동역학회 2009 한국운동역학회지 Vol.19 No.1

운동생리학 : 운동 중 테이핑(Taping)이 허리의 신전력에 미치는 영향

정철정(JeongChul-Jung),이용식(LeeYoung-Sik) 한국체육학회 2003 한국체육학회지 Vol.42 No.6

The purpose of this study is to compare the extension muscle power of waist after taping after long time & intensity exercise. Selected sixteen male subject were divided with taping(n=8) & compare(n=8) groups. Two groups were taken part in the same intensity exercise, then taping group was apply tape at rectus abdominal, external oblique, erector spinae, quadratus lumborum, lumbar vertebrae, sacral vertebrae. Performance of extension muscle for waist were measured peak torque, total work, average power at 30 and 120 degree/sec on the Cybex 770. The statistical analysis of this study was taken One way ANOVA(p<.05). On basis of the results analyzed in this study, the results were as follow:1. After taking part in exercise, the differences of peak torque for extension at 30degree/sec was statistically significant between taping and control groups(p<.05).2. After taking part in exercise, the differences of total work for extension at 30degree/sec was statistically significant between taping and control groups(p<.05).3. After taking part in exercise, the differences of average power for extension at 30degree/sec significant to increase & decrease ratio, therefore statistically no significant between taping and control groups.4. After taking part in exercise, the differences of peak torque, total and, average power for extension at 120 degree/sec was significant to increase & decrease ratio, therefore statistically no significant between taping and control groups.This results suggest that support taping of waist during exercise could be useful to maintain powerful strength in need during the last.

운동역학 : Nontwisting Platform Dives에서 Forward 1/2, 1 1/2 회전시 각 운동량에 대한 분석

정철정(JungChul-Jung),강신(KangSin) 한국체육학회 1998 한국체육학회지 Vol.37 No.2

본 연구는 Platform dive 남자 국가대표 선수를 대상으로 Forward 1/2, 1 1/2 dive수행시 회전의 증가에 따라 중심을 통과한 횡축선상에서 총 각 운동량을 산출하였으며 이때 총 각 운동량에 대한 큰 비중을 차지하는 Remote Hg에 대하여 인체분절이 미치는 기여도를 조사하였다. 각 운동량은 다이빙선수가 Platform에서 도약시 5frame이전에서 정점에 도달하기까지 디지타이징하여 산출하였으며 분석을 통하여 얻어진 결론은 다음과 같다.1. 도약시 발생한 총 Hg의 크기는 피험자마다 다소 차이는 있으나 회전의 증가에 따라 모든 선수들이 크게 증가한 것으로 나타났다.2. 도약시 발생한 총 Hg에 대한 분절의 기여도에서 인체중심으로부터 원위에 있는 분절이 회전의 증가에 따라 크게 증가한 것으로 나타났다.3. Forward 1/2, 1 1/2 dive회전시 Remote Hg에 대한 분절의 기여도에서 팔의 기여도는 회전의 증가에 따라 다른 분절에 비하여 큰 기여도로 나타났다. 이것은 선수가 도약동안에 다이빙을 성공적으로 수행하기 위하여 충분한 각 운동량을 갖추어야 한다는 것을 간주할 때 선수가 얻은 총 Hg중에서 팔이 차지하는 비율이 가장 큰 것으로 나타난 것이다.4. Forward 1/2, 1 1/2 dive 회전시 총 Hg중에서 몸통-머리의 Remote Hg는 회전의 증가에 따라 대체 적으로 감소한 것으로 나타났다.5. Forward l/2, 1 1/2 dive 회전시 총 Remote Hg에 대한 분절의 기여도에서 회전의 증가에 따라 발의 기여도는 크게 증가하였으나 팔에 비하여 적은 것으로 나타났다. A study was calculated total body angular Momentum about a transverse axis through the center of mass that ocurred as the rotational requirement of nontwisting platform dives was increased. Three national subject men were filmed performing dives and investigated contribution of Remote Hg in total body angular momentum.For the divers, Angular momentum was digitized from five frame prior to take off until the peak and the results are as follows.1. The total angular momentum generated at take off varied a little from subject to subject but increased as a function of increasing the required number of rotations in the dive.2. The body segment contribution to the total Hg generated at takeoff increased at the distal segment from the CM as a function of increasing the required number of rotations in the dive.3. For the Foward 1/2, 1 1/2 somersault dive, The contribution to the remote Hg due to the arm was greater than other segments as a function of increasing the required number of rotations in the dive. During take off the divers must create a sufficient momentum about their CM in order to successfully complete the dive.4. For the Foward 1/2, 1 1/2 somersault dive, The contribution to the Remote Hg due to the head-trunk was less than other segments as a function of increasing the required number of rotations in the dive.5. For the Foward 1/2, 1 1/2 somersault dive, The contribution to the Remote Hg due to the foot was greater than other segments but less than the arm as a function of increasing the required number of rotations in the dive.

Disciplinary Biomechanics : 유도 기술의 현장 적용을 위한 생체역학적 분석

김의환,정철정 ( Eui Hwan Kim,Chul Jung Jung ) 한국체육학회 1994 국제스포츠 학술대회 Vol.1994 No.-

달리기 속도와 방향전환 각도에 따른 하지관절 움직임 분석

권오복 ( Oh Bok Kwon ),정철정 ( Chul Jung Jung ) 한국운동역학회 2007 한국운동역학회지 Vol.17 No.1

도마 손 짚고 몸펴 앞 공중 돌아 540도 비틀기의 운동학적 분석

여홍철,윤희중,류지선,정철정,Yeo, Hong-Chul,Yoon, Hee-Joong,Ryu, Ji-Seon,Jung, Chul-Jung 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3

The purpose of this study was to investigate the differences of the kinematical and the kinetical factors that calculated from preflight to postflight of salto forward straight 3/2 turn motion between skitters and less-skitters. four S-VHS video cameras operating at 60Hz were used to record the performances. five elite male gymnasts were participated in this study as subjects. three-dimensional coordinates of 20 body landmarks during each trial were collected using a Direct Linear Transformation method. The digitized body landmarks were smoothed using a Butterworth second order with low pass digital filter and a cutoff frequency of 10Hz. 1. A skitter, got a high score for performance, showed shorter time and faster horizontal velocity than a less-skitter at the board contact. also, a skitter extended quickly his knee and hip joint after contacting board for preflight phase. 2. A skitter revealed faster time and horizontal velocity the vault from taking off board than a less-skiller. A skitter took a long time and high distance to get the vertical peak compared with a less-skiller. 3. For the second phase, a skitter, who executes the most optimal motions among the subjects, displayed a long flight time, a high height, and a far flight distance as well as maintaining consistent horizontal speed even at the peak of post flight. On the other side, a less-scorer displayed a slow vertical velocity, distance and a short time at the point of take-off from vault as well as low height at the peak of post flight.

유도의 선택된 메치기 기술 발휘시 매트반력에 관한 실험적 연구

김의환(Kim, Eui-hwan),강충식(Kang, Choong-shik),정철정(Jung, Chul-jung) 용인대학교 무도연구소 1992 武道硏究所誌 Vol.4 No.1

Developpe a la seconde 동작 시 골반과 하지의 지향각(Orientation angles)의 운동학적 분석

정철정,정혜진 한국운동역학회 2004 한국운동역학회지 Vol.14 No.3

C. J. JUNG, H. J. JEUNG. Kinmatics Analysis of pelvis and lower extremity using orientation angles during a developpe a la seconde. Korean Journal of Sport Biomechanics, Vol. 14, No. 3, pp. 259-270, 2004. The purpose of this study was to analysis of pelvis and lower extremity using orientation angles during a developpe a la seconde. Data were collected by Kwon3D program. Two females professional modern dancer were participated in this experiment. Subjects performed a developpe a la seconde in meddle heights(about 90 deg.) The results were as follows. The orientation angles of pelvis were, in most cases, caused by the movement of trunk and thigh. It was restricted the movement of pelvis within narrow limits because the movement of pelvis was very important to lower extremity alignment. The orientation angle of shank against thigh showed a change of angle about 3-60 in internal ·external rotation The orientation angle of foot against shank showed a change of angle about 6-7 in internal ? external rotation.

水泳 Front Crawl 競技에서 速度와 Stroke 頻度數, 길이와의 관계

鄭哲正 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.2

The present study was undertaken to investigate the relationships of stroke frequency (cycles/sec), stroke distance (m/cycle), and velocity (m/sec) in the front crawl competitive swimming (event : 100m 200m race) and to reveal the change rate of records, velocity, SF and SD between elementary school, middle school, high school student and college & general swimmer. The subjects were 110 competitive swimmer of final events who participate in Dong-A Swimming Competition which was held in a 50m pool in Seoul, August in 1983. The times of every race were recorded electronically. Strokes frequency during each 50m lap were measured by reach observers. The SF and SD were calculated for each subject. It was found in this study that V is related to SD in all events, but has no relation to SF. But in the case of U. S. Olympic swimmers, V is significantly related to SF. From these results, it is suggested that improvement of velocity of Korea competitive swimmer, especially national swimmer during front crawl racing depends upon an increase of SF and SD.

100m 달리기의 운동학적 요인 분석 : 고등학교 남자 선수를 대상으로 For male high school runner

정철정,이종훈 한국운동역학회 1996 한국운동역학회지 Vol.6 No.1

본 연구의 목적은 100m 달리기 구간에서 일어나는 운동학적 변인들을 알아보고자 최대 속대 구간과 마지막 구간을 설정하여 시간 요인, 속도 요인, 거리 요인으로 나누어 분석하였다. 그 결과 최대속도 구간의 평균 속도는 9.70m/s, 마지막 구간의 평균 속도는 8.37m/s로 9.96%가 감속되었다. 또한 최대 속도 간간에서는 평균 지지시간은 0.11초, 마지막 구간에서는 0.13초로 속도가 감소할수록 지지시간이 증가함을 보였다. 그리고 최대 속대 구간에서 마지막 구간으로 평균속도가 9.96% 감소하였으며, 보속은 7.80%가 적어졌다. 한편 신장과 하지장간은 밀접한 상관이 있는 것으로 나타났으나 보속과 보폭은 역상관관계로 나타났다. 보폭은 최대 속도 구간과 마지막 구간에서 차이가 없었으며, 비행시간과 평균 속도와는 상관이 없는 것으로 나타났다. The purpose of this study is to know the kinematical factors happening in 100m running phase. Represenfative 10 high school runners in Seoul are studied, using the maxmum speed phase and final phase. In addition, 3 factors such as time, speed, distanced, are analysed by comparison. 1. The average speed in maximum speed phase is 9.70m/s and the average speed in final phase is 8.37m/s, which is the 9.96% decrease of the speed. 2. The average support time in maximum speed phase is 0.11(s) and in final phase 0.13(s). This shows that the more the speed decreases the more the support time increases. This is an important factor in downing the record of 100m running. 3. When the speed comes down in 9.96% of the average speed from the maxmum speed phase to final phase, the stride frequency decreases by 7.8%. 4. Height has a very close relation with leg length, having 0.88 correlation of coefficient. Stride frequency has a anticorrelation coefficient. 5. There is little difference between the stride lenghts in the maxmum speed phase and finnal phase. 6. There is no significant differences between the flight time and the average speed.