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야구에서의 피칭 동작시 숙련자와 미숙련자간의 운동역학적 차이 분석
이충훈(Chung Hoon Lee),정희석(Hee Suk Jeong),신성훈(Sung Hoon Shin) 한국체육교육학회 2002 한국체육교육학회지 Vol.6 No.2
The purpose of this study was to investigate the difference on ground reaction forces during pitching between the experienced group and the unexperienced group. The subject were divided into two groups consisting 5 mails respectively. The dependence variable was pitching experience and the independent variables were total contact time, vertical ground reaction force, anterior-posterior ground reaction force, inner-outer ground reaction force, maximal vertical ground reaction force. For statistical analysis, independent- samples test was used. On the basic of the results in this study, conclusions were as follows : 1. The experienced group had shorter total contact time than the unexperienced group(p< .05). 2. There was no significant difference between the two groups for the maximal vertical ground reaction force(p,< .05) 3. There was no significant difference between the experienced group and the unexperienced group for the Anterior-Posterior ground reaction force , except for the crossing of braking force and propulsive force (p< .05). 4. For the inner-outer ground reaction force, The experienced had greater outer force than the unexperienced group(p< .05).
박세준(Park Se Jun),정희석(Chung Hee Suk),최기훈(Choi Ki Hoon) 세계태권도문화학회 2016 세계태권도문화학회지 Vol.- No.12
This study aims to inquire into the influence of fun factor on elementary school students who participated in bicycle-riding program during physical education classes. To achieve the purpose, 448 students from 3rd to 6th grades at a elementary school in Gyeonggi-do which conducts bicycle-riding program was selected. Non-probability sampling was used to collect the data and it was processed using Windows SPSS ver. 12.0. This study used frequency analysis, factor analysis, reliability analysis, t-test, one-way ANOVA, two-way ANOVA, and multi-regression analysis. The results are as follows: First, female students show higher result in both fun factor and class satisfaction than male students. There is a significant difference in sociability and compassion only among fun sub-factors. There is no significant difference in class satisfaction. Second, 3rd graders show the highest result in both fun factor and class satisfaction. In addition, there is a significant difference in the fun factor and class satisfaction between school years. Third, in fun factor analysis, female 4th graders are the highest and male 6th graders are the lowest. Fourth, male 3rd graders show highest class satisfaction, while male 6th graders are the lowest. The analytical results of the influence of the fun factor in bicycle-riding has on PE class satisfaction are as follows: Fun factor has a significant influence on PE class satisfaction. In addition, all the sub-factors, that is, interest, sociability, health, and compassion, have significant influence on the sub-factors of PE class(i.e. class management, class environment, and athletic ability). Interest among the fun sub-factors had the highest influence on PE class satisfaction, which suggests that bicycle-riding program is interesting to students and is an amusing program.
훈련 경험 및 성별에 따른 테니스 선수의 라이프 스킬 비교
최기훈(Choi, Ki-Hoon),정희석(Chung, Hee-Suk),신승엽(Shin, Seung-Yup) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.2
This study was to analysis life skill of tennis players according to qualitative research used open questionnaires. The object of investigation were two tennis players. One is male tennis player who trained in America and the other is female tennis player who trained in Japan. The conclusions were as follows; They had an experience the ability of coaches of America and Japan. The coaches tried to grow sense of closeness between coaches and players, and psychological technique training were conducted according to many consultation. Two tennis players told about the advantage of tennis and life skill according to tennis. In physical technique, they told that they have no stress about weight control because of life of tennis player, and male tennis player told that it is easy to find the way to destination because of character of tennis training and female tennis player told that she overcame a language barrier because of good judgment and ability to react instantly in tennis game. In psychological technique, they told that the tennis fostered self-control capability, concentration and self-confidence because of character of tennis. About social technique, they told that they have good interpersonal skills because of character of tennis training.
정종문,김정현,신명주,이미란,정재윤,정희석,김진선,강준길,홍병희,조광섭,Jeong, Jong-Mun,Kim, Jung-Hyun,Shin, Myeong-Ju,Lee, Mi-Ran,Chung, Jae-Yoon,Jeong, Hee-Suk,Kim, Jin-Sheon,Hong, Byeong-Hee,Kang, June-Gill,Cho, Guang-Sup 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.6
32인치 WXGA급 (해상도 1366$\times$768) LCD-TV용 백라이트를 구성하는 외부전극 형광램프 및 각 광학 부품들에 대한 휘도 특성을 조사하고, 광학시트들의 빛의 투과율을 계측하였다. 12등식과 18 등식의 백라이트에 대한 휘도 특성을 조사하였다. 휘도 균일도는 12등식 백라이트에서도 85 %의 휘도 균일도를 갖지만, 광학 부품들의 휘도 값과 백라이트의 효율은 18 등식의 백라이트에 비하여 낮다. 외부전극 형광램프 12 등식과 18 등식의 백라이트에 대하여 램프의 휘도를 100 %로 규격화하면, 확산판, 확산시트, 프리즘시트 (BEF) 및 편광시트 (DBEF)의 상대 휘도는 램프의 휘도 값과 무관하게 정량화된다. 광학 부품의 상대 휘도 값은 12등식은 18등식보다 낮다. 백라이트의 휘도 100 %에 대한 액정 패널의 투과도는 DBEF와 BEF를 사용한백라이트는 7.14 %, DBEF만을 사용하면 6.12 %, 그리고 BEF만을 사용하면 3.21 %이다. 본 실험에서 얻어진 광학 부품들의 상대 휘도의 정량화 데이터와 액정의 투과도는 백라이트 설계를 위한 기초 자료이다. Luminance properties of external electrode fluorescent lamps and optical components in backlight unit (BLU) and optical transmission rates of optical sheets, are investigated for LCD-TV of 32" in diagonal with WXGA level resolution (1366$\times$768). The luminance is measured in 12-lamps and 18-lamps of BLU. The luminance uniformity preserves about 85 % in the 12-lamps backlight, while the luminance of optical components and the efficiency of backlight in the 12-lamps are lower than those in the 18-lamps backlight. When the lamp luminance in BLU having 12-lamps and 18-lamps is normalized as 100 %, the relative luminance of a diffusion plate, a diffusion sheet, a prism sheet (BEF), a polarization sheet (DBEF), has a constant value without dependence on a lamp luminance. The relative luminance of optical components in 12-lamps BLU is lower than that in 18-lamps backlight. The light transmission rate, the relative luminance of liquid crystal display panel with the luminance 100 % of backlight, is 7.14 % in the use of DBEF and BEF, 6.12 % in the use of only DBEF, and 3.21 % in the use of only BEF. Those Data obtained in this experiment for the lamps and optical components, are the design parameters for the LCD backlight.