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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,고진혁,김동한,Lee Dong Chul,Ko Jin Hyeok,Kim Dong Han 대한정형외과스포츠의학회 2003 대한정형외과스포츠의학회지 Vol.2 No.1
목적: 스키손상에서슬관절인대손상의형태와영향을줄수있는인자를분석하고, 수상전후의슬관절기능평가및스포츠활동도변화를알고자하였다. 대상및방법: 슬관절인대손상환자30명을대상으로설문및이학적검사, X선및MRI 촬영을통한평가를하였고, 기능평가는Lysholm Knee Scoring Scale, 스포츠활동도는Tegner activity score로평가하였다. 결과: 내측측부인대손상을동반한전방십자인대손상이11명으로가장많았고, 내측측부인대손상이9명으로그다음이었다. 수상기전은유령발현상(phantom foot phenomenon)과외전-외회전기전이각각13례와12례로83 $\%$를차지했다. 최종추시에서평균Lysholm score는93.4점으로매우양호하였으며, 활동도는수상전Tegner activity score 6.1점에서수상후4.2점으로감소되었다. 기능과활동도평가에서내측측부인대단독손상군이경과가가장양호하였으며, 내측측부인대손상을동반한전방십자인대손상군이경과가불량하였다. 스키손상에영향을미칠수있는요인으로는스키를지속적으로2시간이상탄경우, 바인딩이풀리지않는경우, 적절한스키강습프로그램을받지않은경우였다. 결론: 환자들의수상후Lysholm score는매우양호했지만, 수상후스포츠활동도에서는수상전과뚜렷한차이를보여적극적이고체계적인스포츠복귀프로그램이필요함을알수있었다. Purpose: This study is to analyse the injury patterns of knee ligament and the factors influencing ligament injuries of knee, and to evaluate the changes of knee function and activity after ski injury. Materials and Methods: Thirty cases of ligament injuries of knee were studied with a questionaire, stress radiographs, magnetic resolution imaging, and physical examination. Mean age was 28.6 years old and mean follow up was 29.6 months. Clinical evaluation of Lysholm knee scoring scale was used for knee function and Tegner activity score was used for activity change after ski injury. Results: The anterior cruciate ligament (ACL) injury accompanied with medial collateral ligament(MCL) injury was most in 11 cases and isolated MCL injury was the next in 9 cases. The common types of injury mechanism were Phantom foot phenomenon (13 cases, 43$\%$) and valgus external rotation injury (12 cases, 40$\%$), which constitute 83$\%$ of all case. At the last follow up, the mean Lysholm score was 93.4 and mean Tegner activity score was 4.2. The reduced Tegner activity score after injury was 1.9. Among several injury groups, the evaluation of knee function and activity was best in the isolated MCL injury group and worst in the ACL injury accompanied with MCL injury group. The factors to influence ski injury were participation to ski class, release of binding, and skiing long time more than 2 hours. Conclusions: Lysholm score at last follow up revealed good grading, but sports activity after ski injury was reduced when compared with pre-injury state. It seems to need a active, systemic sports rehabilitation program after sports injury.
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.