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- 저자 : 이은철(Lee, Eun-Chul) (검색결과 190 건)
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경보접근 장애요소의 심각도와 심각도 구성요인 간의 관계
이은철,Lee Eun Chul 한국문헌정보학회 1992 한국문헌정보학회지 Vol.23 No.-
The purpose of this research is to verify the hypothesis that the serious ness of barriers may have significant relevance to barrier components expressing the extent of barrier, e. g. their frequency of occurrence, effect of the barrier on the acquisition of information and on the research project and trend of the barrier. Major conclusions made in this research are summarized as follows: 1. Barriers that their frequency of occurrence are high, show high seriousness of barriers. This indicates that frequency of barriers affects the seriousness of barriers. 2. Barriers that their effects on the acquisition of information and on the research project are large, show high seriousness of barriers. This indicates that the effect of the barrier on the acquisition of information and on the research project affects the seriousness of barriers. 3. Barriers that their trends are increasing, show high seriousness of barriers. This indicates that the trend of the barrier affects the seriousness of barriers.
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이은철,Lee, Eun-Cheol 한국과학기술단체총연합회 2003 과학과 기술 Vol.36 No.2
북한이 핵 개발에 상당히 접근했을 가능성을 배제할 수 없다. 핵 원료를 확보하려는 노력은 이미 20년이 넘었으며, 미사일 개발은 선진국 수준에 버금가고 있다. 핵심 기술이 기폭장치의 개발도 근접해 있을 것으로 추정된다. 북한은 과연 핵무기를 보유하고 있는가?
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ZnO내 전이 금속 불순물의 자기적 특성에 관한 제일원리 연구
이은철,Lee, Eun-Cheol 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.6
Based on first-principles calculations, we study the magnetic properties of Co, Ni, Fe, V, and Mn impurities in ZnO. The stabilities of the ferromagnetic state and the magnetic moment of each impurity largely depend on the amount of doped electron or hole. For lightly doped n-type ZnO, it is found that the doping of Ni ions is the most effective for inducing ferromagnetism, while Fe ions show the most stable ferromagnetic couplings for heavily doped n-type samples. The characteristics of the magnetic interactions of Co ions are similar with those of Fe ions, but Co ions require much larger amount of doped electron than Fe ions to show the ferromagnetic couplings. The ferromagnetic coupling between Mn and V ions is unstable in n-type conditions.
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도서관 장서의 효율적인 운영방안에 관한 연구 -장서의 폐기기준 설정을 중심으로-
이은철,Lee, Un-Chul 한국비블리아학회 1980 한국비블리아학회지 Vol.4 No.-
Due to the rapid growth of publications, librarians have been facing the problems caused by the shortage of stack as well as the quality deterioration of library collections. This naturally disappointed the user communities and the present library activities are weak and inadequate. It seems to the author that one of the desirable actions in remedying this problems is to weed library collections properly and regulraly. The purpose of this study is to establish weeding criteria in library collections, particulary in the fields of polictical science, economics and law In order to establish weeding criteria, shelf-time period which is the length of time that a book remains on the shelf between the last two users of a volume, was measured by examining the book cards or date-due slips of circulating books and collections which remained in the stack. The results of this study are as follows: (1) In the fields of political science economics and law, the shelf-time periods of general materials in Korean for circulation was measured. (2) This study shows shelf-time periods that vary in different subject fields. (3) Combining the shelf-time periods of books in active circulation and the total collection including books which have never been circulated, the size of library holdings which may satisfy a certain percentage of the current circulation can be estimated.
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제일원리 LCAO 방법을 이용한 DNA Nucleobase 흡착된 그라핀의 원자 및 전자구조 연구
이은철,Lee, Eun-Cheol 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.6
Based on first-principles LCAO method, we study the electronic and atomic structures of DNA nucleobases adenine (A), thymine (T), guanine (G), and cytosine (C) adsorbed on graphene surfaces. The ${\pi}-{\pi}$ stacking interactions between graphene and nucleobases lead to the bilayer geometries similar to the Bernal stacked graphite. Through the density of states and charge density analyses, it is found that nucleobases are physisorbed on graphene by dispersive interactions with negligible charge exchange. Our calculations reproduce the atomic structures obtained in previous plane wave calculations accurately with much less computation, and well describe the delocalized ${\pi}-{\pi}$ interactions in graphene-nucleobases system, indicating that the LCAO method is very efficient for investigating graphene-bio systems.
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포스트 코로나 시대 신앙교육을 위한 지능형학습플랫폼 모형 구성 연구
이은철,Lee, Eun Chul 한국기독교교육학회 2021 기독교교육논총 Vol.- No.66
본 연구의 목적은 포스트 코로나 시대를 준비하기 위해 신앙교육을 위한 지능형 학습플랫폼 모형을 개발하는 것이다. 이를 위해서 인공지능 알고리즘, 학습플랫폼 개발 연구, 신앙교육 관련 선행연구를 검토하여 포스트 코로나 시대를 대비할 수 있는 지능형 학습플랫폼 설계 모형의 초안을 개발하였다. 개발된 모형 초안은 전문가 5명을 대상으로 델파이 조사를 실시하여, 타당성을 검증하였다. 개발된 모형 초안은 전문가 타당성 검증결과 내용타당도가 모두 1로 나타나 타당한 것으로 검증되었다. 모형에 대해 전문가들의 수정의견이 3가지가 제시되었고, 전문가들의 의견을 반영하여 모형을 최종 수정하였다. 수정된 최종 모형은 학습자료, 학습활동, 학습데이터 및 인공지능 3개 영역으로 구성하였으며, 각 영역에 교육과정, 학습콘텐츠 추가학습자원, 학습자 유형화, 학습 행동, 평가 행동, 학습자 특성 데이터, 학습활동 데이터, 인공지능 데이터 학습분석 9개의 요소로 구성하였고, 각 구성 요소에는 29개의 세부요소를 설정하였다. 이와 함께 14개의 학습플로어를 구성하였다. 본 연구는 신앙교육을 위한 지능형 학습플랫폼의 기초적인 모형을 최초로 개발한 것이 가장 큰 시사점이라고 할 수 있다. The purpose of this study is to develop an intelligent learning platform model for faith education in preparation for the post-corona era. This study reviewed artificial intelligence algorithms, research on learning platform development, and prior research related to faith education. The draft of the intelligent learning platform design model was developed by synthesizing previous studies. The developed draft model was validated by a Delphi survey targeting 5 experts. The content validity of the developed draft model was all 1. This is the validation of the draft model. Three revised opinions of experts were presented on the model. And the model was revised to reflect the opinions of experts. The modified final model consisted of three areas: learning materials, learning activities, learning data, and artificial intelligence. Each area is composed of 9 elements of curriculum, learning content additional learning resources, learner type, learning behavior, evaluation behavior, learner characteristic data, learning activity data, artificial intelligence data, and learning analysis. Each component has 29 sub-elements. In addition, 14 learning floors were formed. The biggest implication of this study is the first development of a basic model of an intelligent learning platform for faith education.
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