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최진원,김동규,이승복 ( Jin Won Choi,Dong Gyu Kim,Sung Bok Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.1
N/A The high temperature wear behavior of Ni-Grain roll materials applicated to finishing work rolls for hot strip mills has been investigated. Experiments have been conducted with hot rolling simulator up to 1.25 × 10⁴ revolutions, and the deterioration of roll surface was analysed. The procedures of the deterioration of roll surface were cleared. During the early stage of hot rolling, surface of work roll is covered with the even black film formed by oxidation of roll material at high temperature, followed by banding of the black film and then the wear resistant carbides surrounded with matrix are emerged by being worn out of the matrix during successive rolling. The emerged carbides induce the phenomina of sticking, rolling material stuck to roll surface, by the evolution of uneven friction heat and then the particles stuck on the roll surface are disappeared by the successive wear during hot rolling. v
최진원,강노경,김정욱,김성철,Choi Jin-Won,Kang Noh-Gyoung,Kim Jeong-Wook,Kim Seong-Cheol 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.7a
본 논문에는 초광대역 통신시스템을 위한 주파수 영역의 통계학적 채널 모델을 서술하고 있다. 채널 모렐링은 3개의 사무실 환경, 46개의 송, 수신 위치에서 얻어진 23,000개의 채널응답함수로 부터 얻어졌다. 측정실험을 통해 얻어진 데이터를 바탕으로 주파수 변화에 따른 경로감쇄지수 변화에 대해 서술한 후 전파환경과 가시경로의 존재여부에 따른 수신신호의 확률분포모델을 연구하였다. 마지막으로는 수신된 주파수 톤에 해당하는 수신파워의 표준편차와 같은 통계적 특성들을 고찰하였는데, 가시경로가 존재하는 경우에는 송, 수신기 사이의 거리가 멀어지면서 표준편차 값이 커지고 그에 따라 수신 주파수 톤의 파워가 평균 수신파워에서 일정한 범위 안에 들어올 확률이 떨어지는 것을 알 수 있었다.
최진원(Jin Won Choi),이소희(So Hee Lee) 한국아동학회 2002 兒童學會誌 Vol.23 No.4
The purpose of this study aimed at establishing the validity and reliability regarding the instrument of assessing child psychological well-being. The child psychological well-being rating scale contained 3 dimensions (sense of competency, sense of relation, sense of improvement) 8 variables (sense of control, sense of achievement, sense of confidence, sense of acceptance, sense of intimacy, sense of balance, sense of morale, sense of hope) and 4 rating scale of 80 items. After the scale development, the estimates of reliability for the scale were high. Cornbach α was .962 and generalizability was .875. And concurrent validity, criteria related validity, and discriminant validity appeared to be evident sufficiently to the validity of child psychological well-being instrument. The significance of the present study was intended to apply scale validity procedure by using generalizability.