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이동철,김택기,송인명 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.4
The structure, saturation magnetization and magnetic anisotropy of Co_(82)Cr_(18) thin film have been investigated. The films were prepared by rf-sputtering technique. The films consist of columnar grains, whose crystal structure is hcp. C-axis of the grains is aligned roughly parallel to the normal of film surface. Angular distribution of the c-axis is less than 6˚ with respect to the normal of the film surface. The saturation magnetization of film is 380 emu/㎤ at room temperature, and it increases about 20 emu/㎤ after heat treating at 400℃ for 1 hour. The easy axis of magnetization of the film is the normal direction of the film. The coefficients of magnetic of the film is the normal direction of the film. The coefficients of magnetic anisotrouty, K_(2θ) and K_(4θ) were 4.9×10^5 erg/㎤ and -5×10⁴erg/㎤, respectively. The magnitudes of the coefficient increase about 1.7 times by heat treatment at 400℃ for 1 hour.
이동철,심경구,서병기 한국조경학회 1995 韓國造景學會誌 Vol.23 No.3
This study was conducted to investigate the environmental factors of habitat of Lindera erythrocarpa and to test seedling growth of the plant transplanted in a field of Sung Kyun Kwan Univ. in Suwon, Kyungkido. The results were as follows ; 1. The wild lindera erythrocarpa was growing in Mt. Kwan whose January average temperature was -3.4$^{\circ}C$, and minimum average temperature was -14.8$^{\circ}C$ in January. It was also growing in Mt. Suri whose daily minimum temperature is 3.4$^{\circ}C$ lower than that of Seoul. Therefore, there was no problem for Lindera erythrocarpa to grow in Seoul regions in terms of winter coldness. 2. The growth of seedlings of Lindera erythrocarpa transplanted in a field of Sung Kyun Kwan Univ. in Suwon, Kyunkido in 1990 showed that average height of the tree was 1.64m, average diameter of root was 2.44cm, and that average width of crown was 1m. Therefore, there was no problem for Lindera erythrocarpa to grow under winter coldness in Suwon area.
최근의 ITU(국제전기통신연합) 전기통신개발회의 표준화동향과 우리의 대응방안 -ITU-D SG1 표준화회의를 중심으로-
이동철,Lee D.C. 한국정보통신기술협회 1995 TTA저널 Vol.38 No.-
본고에서는 새로이 탄생된 ITU-D SG1 연구반 회의를 중심으로 회의의 배경, 부에노스아이레스 선언문 내용과 연구과제와의 관계, 향후 연구계획, ITU-D(개발분야)에 대한 참여확대를 모색하고 동 분야에 우리나라가 적극적으로 참여하여 개발도상국들간의 표준화분야를 선도적으로 이끌어갈 필요성에 대한 우리의 대응방안 등을 제시하고자 한다.
이동철,손홍,Lee, Dong-Cheol,Son, Hong 한국전자통신연구원 1997 전자통신동향분석 Vol.12 No.3
세계전기통신표준총회(WTSC)는 새로운 전기통신 환경변화에 따라, CCIT 총회가 명칭을 달리한 것으로 이번이 2번째 회의이다. 통상 4년마다 개최되며, 표준 제.개정, 차기 표준화과제 확정, 표준화 관련 제도 제.개정, 연구반 의장단 선출, 리드그룹 선정, ITU-T 예산 확정을 다룬다. 본 고에서는 WTSC의 전반적인 변화내용에 대해 분석한다.