남자 고등부 양궁선수의 슈팅동작 시 상지분절에 대한 운동역학적 분석

오정환(Cheong Hwan Oh),신의수(Eui Su Shin),김진성(Jin Sung Kim) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.57

The purpose of this study was to provide basic data to secure the consistency of shooting skills through thekinetic analysis about shooting motion targeting 6 male high school archery players. Study results about kineticvariables are as follows. First, First, times in follow-through phase from release to delivery were identified to be 0.12±0.06 seconds. Second, the angle of right shoulder joint was identified to be larger at release point compared with at deliverypoint and the angle of left shoulder joint didn``t show thbe ig difference both at release point and deliver ypoint. Second, the angle of right shoulder joint was identifie dto be larger at release point compared with a tdelivery point and the angle of left shoulder joint didn``t show the big difference both at release point and deliverypoint. Third, working ranges in follow-through section were 17.52±13.47° at right hand side and 0.13±6.41° atleft hand side, which showed big working ranges in right shoulder joint. Fourth, angles of right elbow joint showed 34.14±11.97° at release point and 22.14±5.22° at delivery point. And, working range of elbows showed 5.59±2.67°. Fifth, average integrated EMG (Electromyogram) showed differences in all right Trapezius, biceps brachii ,deltoids and latissimus dorsi muscle and showed higher the EMG valuses in the order of deltoids, biceps brachii,Trapezius and latissimus dorsi muscle.

합기도 호신술 손목 옆으로 빼기 동작의 운동학적 분석

오정환(Oh, Cheong-Hwan),이정태(Lee, Jeong-Tae),신의수(Shin, Eui-Su),배재희(Bae, Jae-Hee),홍수영(Hong, Soo-Young),최정규(Choi, Jung-Kyu) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.4

The purpose of this study was hapkido self-defense through the analysis of 3D Motion capture to the side the wrist escape motion is to kinematic analysis. To do this, the study hapkido instructor for seven kinematic analysis was conducted and the following results. First, the preparation phase was 68.97% of the total time, total time was 0.58 ± 0.08 s. Second, COM position did not move from side to side, front moved downward direction. Third, COM velocity the left and right, front and back and vertical was getting faster. Fourth, the angle of the right shoulder, the wrist joint operation conducted subtraction becomes larger the more joint flexion angle was found to be, each of the joint, the elbow joint was smaller the curvature. And wrist in the event, there was to difference. Fifth, the right hip joint angle of the flexion in all phase and the knee joint angle of the flexion in the escape phase. And ankle plantar flexion angle was in the escape phase. Sixth, the tilt angle of the body was gradually built the trunk.

남자 고등부 골프선수의 숙련수준에 따른 롱 아이언 스윙동작의 운동학적 비교분석

오정환(Oh, Cheong-Hwan),신의수(Shin, Eui-Su),홍수영(Hong, Soo-Young),김윤호(Kim, Yoon-Ho) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.1

The purpose of this study is to analysis the kinematic characteristics of golfers in a high school students when they swing with long-iron. The subjects are eight golfers who go to student golfers. We provided them with the scientific data required for their technical training and the basic data to from the injury. The conclusion of this study are as follows. First, During the operation of long- iron swing, the required time of skilled showed shorter than that of unskilled. It is observed that both groups showed statistically significant difference at P3. Second, For the displacement of CM(center of Mass) to vertical, the skilled moved short in both groups showed statistically significant difference in E2 and the unskilled moved short in both groups showed statistically significant difference in E3, E6 and E7. Third, For the displacement of CM velocity to horizontal, the unskilled showed higher speed than the skilled and both groups showed statistically significant difference in the E2. For the displacement of CM velocity to vertical, the skilled showed higher speed than the unskilled and both groups showed statistically significant difference in the E2, E3 and E6. Fourth, For the joint angle, both groups showed statistically significant difference at both the left shoulder joint, both elbow joint, both wrist joint. For the trunk incline angle, the skilled showed bigger angle than the unskilled. but both groups showed statistically non-significant difference.

VDT 작업시간에 따른 목의 가동범위와 근전도 분석

오정환(Oh, Cheong-Hwan),신의수(Shin, Eui-Su),정익수(Jeong, Ik-Su) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.3

The purpose of this study was to investigate the range of motion and muscle activity in the neck when the work hours or two hours if there is any difference. In this study to achieve the purpose of the study it was chosen as 10 VDT workers. This study was used as a control object and a high-speed camera to analyze a 3D motion analysis program uses Kwon3D XP. And TeleMyo 2400T G2 was used for the analysis of muscle activity of sternocleidomastoid, cervical paraspinals, and upper trapezius. Statistical analysis was carried out for repeated measures ANOVA for comparative analysis of the the Pre, an hour and two hours work, post verification was contrast verification. and statistical analysis using the SPSS 21.0 program. First, the range of movement of the neck of the VDT working hours showed a significant difference flexion, extension, rotation left and right. And shown to the neck two hours is more rigid than an hour. Also been shown to a high rate of decrease of the rotational range of motion than the flexion and extension. Second, sternocleidomastoid and upper trapezius muscle activity in accordance with VDT working time showed significant differences in both the left and right. And muscle activity of the cervical paraspinals showed a significant difference in left. an hour working time than two hours working time is shown to reduce the muscle activity of the sternocleidomastoid, upper trapezius, and cervical paraspinals. And decrease rate of muscle activity is on the left upper trapezius and cervical paraspinals higher than elsewhere. Neck rigid was greater than B is to A, the rotation was smaller than the range of motion flexion and extension. sternocleidomastoid, upper trapezius, and cervical paraspinals muscle activity was found to be too low.

합기도 찍어차기동작의 운동학적 분석

오정환(Cheong Hwan Oh),김용학(Yong Hak Kim),신의수(Eui Su Shin) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.42

The purpose of this study is to conduct a kinematic analysis of the jigeochagi in Hapkido matches to clarify which jigeochagi movements are most efficient. Through such, Hapkido trainers and athletes can apply efficient kick forms and training methods to improve athlete performance while serving as foundational data to improve Hapkido match performance by applying onsite practical training. First, time required for kicks was shown to have minimal difference among all A, B, C, and D test subjects. Particularly, there was almost no difference min angle of 3 phase knee until point of impact. Such results suggest that there is no significant difference in the kick speeds for all training athletes. Second, vertical change of center of gravity upon kicking showed differences in highs and lows among subjects in E1. While an event was occurring, all test subjects showed higher center of gravity levels. Within pre/ post change of center of gravity, such was shown to increase as the event progressed. For kick preparation, center of gravity was shown to be towards the rear in E1. As for 3 phase sides, center of gravity was shown to move forward instantaneously in a very short time. Third, as for change of joint angle, for hip joint was shown to have the highest angle change in 3 phase. Fourth, for knee, highest angle change was shown in 3 phase. ankle angle change w\as shown to be highest in 1 phase.

100m 출발 시 스타팅 블록의 발위치에 따른 지면반력분석

오정환(Cheong Hwan Oh),최수남(Su Nam Choi) 한국사회체육학회 2011 한국사회체육학회지 Vol.0 No.45

This study is to analyze the ground surface resistance according to the positions of the feet on the starting block in 100 meter race using short distance starting block precision sensor. The followings are the results of the study. First, in starting response time, B(type) showed faster response to the starting signal in both directions such as left and right. Second, in the maximum horizontal strength delivered as forwarding power, B(type) showed bigger strength in both direction such as Left (0.02;BW) and Right (0.16;BW). Relatively, in the left side both types (A and B) showed stronger resistance. Third, in the maximum vertical strength value, in both directions B(type) showed bigger value as Left (0.24;BW) and Right (0.14;BW). ). Relatively, both types (A and B) showed larger maximum vertical resistance in the right side. Fourth, in the maximum resistance, B(type) showed bigger values as left (0.13;BW) and right (0.15;BW). Relatively, both types (A and B) showed larger maximum resistance in the left side. The strength added at the starting movement of the player is delivered to the pedal as vertical strength (Fr), which delivers the power to the whole structure of the pedal and the connection hook of the support and cause Horizontal Resistance (Fh) and Vertical Resistance (Fn). To make a long story short, B (type) that place the whole soles of the feet on the starting block pad has better starting power (propelling power) than A(type) which place the feet on the surface of the ground and on the block pad at the same time. It is supposed that if you have larger starting power, you can get initial horizontal speed more quickly. Eventually, it is guessed that the posture or method to make forwarding power bigger will bring the improvement of the initial record.

여자 펜싱 선수의 에뻬 경기 팡트 동작에 대한 운동역학적 분석

오정환(Oh, Cheong-Hwan),배재희(Bae, Jae-Hee),신의수(Shin, Eui-Su),홍수영(Hong, Soo-Young),최정규(Choi, Jung-Kyu),이정태(Lee, Jeong-Tae) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.4

The purpose of this study was to through the kinetics analysis on the fente motion in fencing, provide the basic data by which a training method can be found to improve the fencing techniques for the beginners and players. To do so, this study chose 7 woman fencer as test objects and recorded their motions to analyze time consumed, the velocity of blade, the angles of a joint and ground reaction force. First, the total duration time came out to be 0.56±0.11s. The shortest duration time occurred in phase 2, from the moment the knee of the front feet stretches and until the foot touches the ground. Second, COM position stretched in forward direction and vertical displacement gradually moved lower. Third, COM velocity appeared moving the fastest to all direction at the moment the knee joint stretches. Fourth, in terms of the angle of the upper extremity joints, the moment when the blade pokes the effective surface, the shoulder angle of the hand holding the blade stretched elbow joints at maximum. Fifth, in terms of the angle of lower limb joints, when the blade pokes the effective surface, it bends hip and knee joints the greatest. Six, speed of the point of the blade was fastest when the knee joints stretched. Seven, ground reaction force was at maximum when the front feet is lifted from the ground until it falls. It shows the power of control at the moment of poking.

복싱 원·투 스트레이트 동작의 운동역학적 특성 분석

오정환(Oh, Cheong-Hwan),신의수(Shin, Eui-Su),김진표(Kim, Jin-Pyo),노대성(Rho, Dae-Sung) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.6

The purpose of this study was to through the kinetics analysis on the one-two straight punch motion in boxing, Provide the basic data by which a training method can be found to improve the boxing techniques for the beginners and experts. To do so, this study chose 4 boxing players as test objects and recorded their motions to analyze time consumed, the velocity and distance of a fist, the angles of a joint and ground reaction force. For the video recording, 9 infrared cameras (Motionmaster 100, Visol) and 2 force platform (AMTI, USA) were used to measure ground reaction force. The recorded data was analyzed by Kwon3D XP program and the findings are as follows; First, phase of a left straight punch took a short time in the total distance time. Second, compared to the left straight distance time, the right straight took a longer distance time and a faster instantaneous velocity. Third, lower limb Joints showed more dynamic than right ones. And ankle joints showed more motions than buttock ones. Fourth, at the impact moment of left and right straight punches, resultant of the ground reaction force(GRF) were exerted on the front foot for both punches.

고등부 여자 육상 선수의 100 m 크라우칭 스타트 동작에 대한 운동학적 분석

오정환(Oh, Cheong-Hwan),신의수(Shin, Eui-Su),홍수영(Hong, Soo-Young),임승희(Lim, Seung-Hee),양성준(Yang, Sung-Jun) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5

The purpose of this study was to analyze the kinematic factors crouching start movement of skilled and unskilled intended for female high school athletes. Conclusions are as follows. First, the total time is of the subjects showed rapid skilled showed a significant difference in P2 (p<.05). Second, horizontal displacement of the COM has showed a skilled moves away, it showed a significant difference in event 3 (p<.05). And showed a move away from the third period both skilled and unskilled, vertical displacement of the COM did not appear to show significant differences or lower is skilled in all the events. Third, horizontal velocity of the COM has showed rapid skilled in any event, event 2, event 3 and event 4 was significantly different from (p<.05). And the vertical velocity of the COM did not show a significant difference. Fourth, the angle of the joint of the right hip joint event 4, and the right knee showed a significant difference in joint events 4 (p<.05). And skilled has been shown to reduce the hip joint angle of the leg is moved relative to unskilled. Taken together, the vertical displacement of unskilled were low in order to improve the crouching start movement during horizontal velocity. And it is moved by the angle of the hip joint of the leg that is less likely to raise more training needed by dragging the thigh toward your chest. And it would require a study using EMG equipment with GRF to see the various kinetic factors.

남자 고등부 수영선수의 트렉 스타트 동작에 대한 운동학적 요인 분석

오정환(Oh, Cheong-Hwan),임승희(Lim, Seung-Hee),신의수(Shin, Eui-Su),홍수영(Hong, Soo-Young) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.3

The purpose of this study is to conduct a kinematic analysis for the trek start motion using a new start deck, with high school swimming athletes as study subjects. The following was concluded through the study. First, a total time of .71±.06 s was taken for the trek start motion with the P1 taking the longest time, followed by the P3 and P2. Second, during the start motion, the horizontal displacement in CM(center of mass) was longest in P3(E3~E4), while vertical displacement was greatest in Event 3. Third, during the trek start motion, the CM horizontal velocity was the highest at 4.41±.33 m/s in Event 4 for all directions, while the vertical velocity was highest at -3.07± 23 m/s in Event 4 in the downward direction. Fourth, during the start motion, for both the hip joints and knee joints, the leg in the back was turned first. Fifth, the moment of the lower limb segment during the start movement was highest in the leg in the back for Event 2 and 3. In conclusion, during the start motion on the new deck, in order to improve performance, it is more advantageous to cut down the time taken in P1 and to appropriately select the location of the CM in Event 1. Since the moment of the leg in the back is expressed more than the leg in the front, exercises that can make the rotation angle of the hip joints and knee joints on the side of the leg in the back can be helpful.