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중등학교 육상선수의 코치지지와 스포츠 자신감 및 학교생활 적응의 관계
차정근(Cha, Jung-Keun),윤찬수(Yoon, Chan-Soo) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.2
This study seeks to empirically analyze the structural relationship between coaching, confidence, and adaptability to school by understanding how confidence mediates the system as a whole. A group of middle school-high school athletes registered under KAAF as of 2021, were selected for convenience sampling. The final analysis includes a sample group of 250 students. The collected data was analyzed using a statistics program called SPSS 21.0 and AMOS 21.0 to conduct frequency analysis, exploratory factor analysis, credibility analysis, one dimensional confirmatory factor analysis, correlation analysis, structural equation modeling analysis. The deduced results are as follows. First, coaching an athlete showed a significant level of impact on his/her confidence. Second, coaching an athlete showed a significant level of impact on his/her adaptability to school. Third, an athlete’s confidence showed a significant level of impact on his/her adaptability to school. Lastly, the athlete’s confidence was shown to have a mediated effect on the relationship of coaching, confidence, and adaptability to school.
체육 중·고등학교 감독교사와 학생선수 간 상호작용과 학교생활 적응 및 운동 몰입의 관계
차정근(Cha, Jung-Keun),최유리(Choi, You-Lee) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.6
This study seeks to analyze the relationship between the interaction of Physical Education instructor coach and student player and its impact on their adaptability to school and commitment to physical activity. A group of students players from a middle-high school that specializes in physical education in S city were selected for convenience sampling. The final analysis includes the sampling of 250 students. The collected data was analyzed using a statistics program called Windows SPSS PC+ 22.0 Version and AMOS 22.0 to conduct frequency analysis, exploratory factor analysis, one dimensional confirmatory factor analysis, credibility analysis, correlation analysis, structural equation modeling analysis, and bootstrapping analysis. The deduced results are as follows. First, the interaction between the Physical Education instructor coach and student player shows a significant level of attentive impact on the students’ adaptability to school. Second, the interaction between the Physical Education instructor coach and student player does not show a significant level of attentive impact on the students’ commitment to physical activity. Third, the students players’ adaptability to school has a significant level of attentive impact on their commitment to physical activity. Lastly, the relationship between the interaction of Physical Education instructor coach and student player and the students players’ commitment to physical activity has a mediated effect on their adaptability to school.
Matrix Pencil Method를 이용한 OFDM의 주파수 추정
차정근(Jungkeun Cha),강석진(Sukjin Kang),박상백(Sangback Park),고진환(Jinwhan koh) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1C
OFDM 전송방식에 있어서 중요한 주파수 옵셋 추정을 하는데 있어서 기존의 FFT 방법이 가지고 있는 문제점을 보완하는 알고리즘이 많이 연구되고 있다. FFT의 정수배 옵셋외에 소수배 옵셋이 생겼을때 제대로 추정해 낼 수 없는 점을 보완하는 High resolutional technical 알고리즘을 보면 MVDR, MUSIC, root MUSIC, PISARENCO 등이 있다. 본 논문에서는 이러한 알고리즘 중에 MPM(Matrix Pencil Method)를 이용하여 FFT의 문제점을 보완하고 옵셋 추정을 시뮬레이션 해 보았다.
육상선수가 지각한 지도자 공정성과 운동행동의 관계에서 운동지속의 매개효과
차정근(Cha, Jung-Keun),윤신혜(Yoon, Sin-Hye) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.4
The purpose of this study was to investigate the relationship between the coach"s justice perceived by track and field athletes and sport behavior as well as the mediating effects of exercise adherence in the relationship between the coach"s justice and sport behavior. In order to achieve this goal, a survey was conducted on 250 track and field athletes in high school, university, and business team that completed athlete registration in The Korea Association of Athletics Federations in 2020 and frequency analysis, confirmatory factor analysis, correlation analysis, path analysis that applied structural equation model, and bootstrapping analysis were used as the data processing method. The following are the results of this study. First, the coach"s justice perceived by the track and field athletes caused an influence on exercise adherence. Second, the coach"s justice perceived by the track and field athletes caused an influence on the sport behavior. Third, the exercise adherence of the track and field athletes caused an influence on the sport behavior. Fourth, in the relationship between the coach"s justice perceived by track and field athletes and sport behavior, exercise adherence had partial mediating effects.
체육고등학교 학생선수들의 지도자 코칭지식 지각이 경기력에 미치는 영향
차정근(Cha, Jung-Keun),조욱상(Cho, Ook-Sang) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.2
The purpose of the study was to analyze the relationship between elite sport centered high school students’ perspective on coach’s knowledge and their athletic performance. Total 260 student athletes in a elite sport centered high school that is located at an urban area participated in the study. The survey for collecting data related to subjects’ perspective on coach’s knowledge and athletic performance level were designed by modifying questions of existed survey that previous research studies designed. Total 242 survey that provide answers to all questions were applied to data analysis. In order to secure construct validity and reliability of the applied survey, confirmatory factor analysis was conducted. Also, Pearson’s corelation analysis was employed to analyze the relationship among variables. Based on the results of data analysis there is a statistically significant relationship between elite sport centered high school students’ perspective on coach’s knowledge and their athletic performance. Also, a strong correlation among the most sub-categories of coaching knowledge and athletic performance was detected.
UL밴드에서 BT와 IEEE 802.11에 의한 간섭의 분석 연구
강석진(Suk-Jin Kang),차정근(Jung-Keun Cha),강형구(Hyung-Koo Kang),고진환(Jin-Hwan Koh) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A
요즘 사무 빌딩이나 공항에서의 ISM(Industrial Scientific and Medical) 밴드 사용이 증가함에 따라 동일 주파수 대역을 사용하는 BT(Bluetooth)와 무선 랜은 상호 충돌 발생이 일어난다. 이러한 문제점이 최근 연구과제로 등장하고 있다. 본 논문은 채널 간섭의 모델에 의거하는 UL(unlicensed) ISM 주파수 대역에서 BT와 802.11에 있어서 충돌 평가 모델에 의한 간섭을 분석 한다. 전파 평가 모델 방법론에 의한 AP와 STA간의 범위에 따른 BT 간섭의 수와 허용할 수 있는 최대 BT 신호를 알아본다. 그리고, BT를 바탕으로 한 액세스 네트워크의 실행에서 802.11b 시스템에 관한 BT의 기본 간섭 메커리즘 및 간섭이 어느 정도 미치는지에 관한 예비 결과를 나타낸다.
Bessel와 Chebyshev 함수를 이용한 동시 추정에 관한 기법
강석진(Suk-Jin Kang),차정근(Jung-keun Cha),윤호태(Ho-Tae Yoon),고진환(Jin-Hwan Koh) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1C
전자계 산란의 시간영역 신호는 대응하는 주파수 영역 응답에 대해서도 동시에 효율적인 방법으로 나타낼 수 있는 이유는 다항식의 직교하는 성질 때문이다. 직교 다항식을 이용함으로써, 이른 시간과 낮은 주파수 영역을 동시에 추정할 수 있다. 그 접근법은 CGM(Conjugate Gradient Method)방법과 간단한 DFT(Discrete Fourier transform)에 의거한다. 본 논문에서는 Bessel-Chebyshev 함수를 이용한 이른 시간과 낮은 주파수영역 응답을 동시에 추정하기 위한 접근의 방법을 제시하고, 구현 하였다. 오직 이른 시간과 낮은 주파수 정보를 필요로 하기 때문에 이 방법으로 계산시 반복계산의 수렴속도가 무척 빠르다는 이점이 있어, 신속한 정보를 얻을 수 있다.