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오정환(Jheong Hwan Oh),최수남(Su Nam Choi) 한국사회체육학회 2007 한국사회체육학회지 Vol.0 No.30
This study analyzed the effects of the length of the bag strings on the walking posture of the students. The subjects were 10 male students in the second grade of middle school (14 years) who have standard height (167.7cm) and weight (60.2kg). It was analyzed through three dimensional image analysis. The followings are the results of the study and the conclusion of the discussion. When holding the bag with long string (Type D), the students showed the reduced stride and forward inclined upper body in order to save the walking energy. It seems that they try to save the energy consumption by reducing walking speed, which means walking holding the bag in Type D wastes much energy. When reducing the length of the strings of the bag (Type C), they inclined the head forward more deeply in average, although there is no significant statistical difference. When walking holding the bag in Type C for a long time, they are likely to have pains, which can be developed into Cervicalgia because the mussels such as splenius capitis and lingissimus capitis which support the head when we lower the head forward. If this symptom repeats everyday for a long time, it gives bad influence on the posture of the middle school students and cause the pains of the neck. Therefore, it is proposed that schools should guide and teach not to hold the bag with the strings adjusted too short or too long.
테니스 탑 스핀 서비스 속도 요인에 기여하는 운동학적 비교분석
오정환(Oh Jheong-Hwan),최수남(Chio Su-Nam),이정태(Lee Jeong-Tae) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.4
By the comparison and the analysis of the different factors during the tennis Top spin serve motion such as the required time per section, the movement displacement of the racket, the velocity of the upper limbs joints, the physical center of gravity, and the angle and the angular velocity of the upper limbs joints between an ace player and a mediocre player, these following results were drawn. First, the experiment result of the total time required per section in a tennis Top spin serve motion showed that an ace player was faster than a mediocre player by 0.4 seconds. This result suggested that it was required to increase the speed of the racket head by a swift swing to perform an effective flat serve motion. Second, the velocity of the wrist joints of gravity of an ace player was faster in every phase than that of a mediocre player in a tennis top spin serve motion. Third, the velocity of the upper limb joints of an ace player was faster in every phase than that of a mediocre player in a tennis Top spin serve motion. Fourth, at the moment of impact of a tennis Top spin serve, an ace player had greater extenton of the angle of the wrist joints by an 4 degree than a mediocre player. An ace player also had greater extension of the angle of the elbow joint and the shoulder joint respectively by a 2 degree and a 4 degree with a mediocre player. Fifth, an ace player was shown to have a greater change of the forward and the backward inclination (or the anterior and posterior inclination) of the upper body
크라우칭 스타트 출발선과 Starting block 위치 변화에 따른 운동학적 분석
최수남(Su Nam Choi),오정환(Jheong Hwan Oh) 한국사회체육학회 2007 한국사회체육학회지 Vol.0 No.30
This study was attempted to analyze different three types of starting positions according to the distance between starting line and block by means of three-dimensional images, with the subjects of sprinters who have ranked first in a national athletic meet or the equivalent. The results are summarized as follows: 1. Forchanges in the time required from first step to third step, Type B was the fastest; even for the total time required, Type B (1.4 sec) was the fastest. Thus, it is considered that for best record, it is required to minimize the time required for starting position. 2. For the Y-axis (또는 Y-sided) displacements around the body in the starting section, Type A displayed the greatest change (3.31 m) even for Z-axis displacements, the same type did (20.64 cm). Therefore, it seems necessary to increase the Y-axis displacement in the forward direction while keeping the displacement of the vertical axis appropriate. 3. For changes in generally moved strides, Type A (4.05 m) showed the widest stride, and the most efficient one for best record.
최수남(Choi su-nam),오정환(Oh Jheong-Hwan),이정태(Lee Jung-Tae) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2
Boxing left StraighBy the comparison and the analysis of the different factors during the tennis Top spin serve motion such as the required time per section, the movement displacement of the racket, the velocity of the upper limbs joints, the physical center of gravity, and the angle and the angular velocity of the upper limbs joints between an ace player and a mediocre player, these following results were drawn. It took the subjects an average total of 1.94 seconds for each range of the top-spin serve movement, and subject S1 had the fastest time (1.45secs). The average speed of the wrist joints when given impact due to the top-spin movement was 11.6㎧, and subject S1 had the fastest wrist joint speed at 13.2㎧. The average speed of the elbow joints was 6.1㎧, and subject S1 had the fastest elbow joint speed at 6.6㎧. The average speed of the racket head upon impact was 40.92㎧, and subject S1 had the fastest speed at 44.2㎧. The angle of the wrist joint upon impact due to top-spin serve movement was the most curved for subject S4, at 163.03°. The wrist joint angle of subject S1 elongated the most at 178.5°. The average shoulder joint angle was 141.41°. Subject S5 had the fastest arm joint angular velocity upon impact.