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문헌정보 분석을 통한 탄소 나노 튜브 기술 개발 동향 분석(Ⅱ)
홍태환 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.4
The current status of research and development on the nanotechnologies are reviewed by using literature information analysis. Especially, carbon nanotube(CNT) is one of the most important advanced materials for nanotechnology. Because of the extremely small dimensions, a large volume fraction of the carbon atoms are formed to the tubes-single or multi wall tube-, and this confers special attributes to these materials. The CNT appears to be a great potential for applications, such as emitter, field emission display(FED), secondary battery electrode, fuel cell, atomic force microscopy(AFM)/scanning tunneling microscopy(STM) tip, ultra small diodes, hydrogen storage cell, gas sensors, microwave devices, nano capsule, oil absorbers, nano composites, etc… in the near future for CNTs.
가정 학습 과제의 내용과 그 처치에 관한 분석적 연구 : 산수과와 자연과 and Its Treatment
송환용,신순임,이용화,신경자,강태완 춘천교육대학교 과학교육연구소 1978 과학교육연구 Vol.5 No.-
We aimed at in this paper analyzing the content of homework in arithmetic and science education in elementary school, and finding out teacher’s guiding direction and student’s solving trend of it. The results are as follows: 1. Homework is given similarly by the ratio of the problem in textbook of the assigned school hours of the subject. 2. Teachers demand sincerity of the students in solving their problems, but they seem to negiect further direction. 3. Students are keen on solving the problems and think that it gives them great help for their learning. 4. It will be more effective for the teachers to make out the homework jointly rather than individually.
洪泰煥 충주대 2003 産業科學論文集 Vol.11 No.-
Magnesium and magnesium alloys are attractive for hydrogen storage materials, but activation and hydriding/dehydriding kinetics, thermodynamic equilibrium parameters and degradation behaviors have to be improved for its applicability. In this study, for manufacturing Mg based lightweight hydrogen storage materials economically, we have been made to propose a new mechanical alloying process by high-pressure hydrogen induced mechanical alloying using Mg and Ni chips and an advanced melting/casting process with environmental conscious
비용ㆍ편익 분석을 중심으로 한 중수도 시설의 처리방법별 적정규모선정
노상환,민동기,송영일,박태욱,박주양 한양대학교 환경공학연구소 2000 環境科學論文集 Vol.21 No.-
미래의 안정적인 수자원 확보를 위한 수요관리방안인 중수도 시설 설치 시 발생하는 비용과 편익의 현재가치를 이용하여 처리방식별로 중수도 시설의 경제성 분석을 하였다. 사회적 편익을 고려하였을 경우 중수도 시설규모가 300㎥이상의 1일 처리용량의 경우 경제성이 있는 것으로 나타났다. 그러나 사적편익을 고려하였을 경우에는 사회적 편익에서 고려된 환경비용절감등의 여러 외부 편익이 포함되지 않아 중수도 시설에 의한 편익이 작아지게 된다. 따라서 사적편익만을 고려할 경우에는 대체로 경제성이 있는 중수도 시설의 규모는 사회적 비용을 고려하였을 경우 보다 커진다. Water reuse is a control method of water demand to steadily assure water resources in the future. Economical efficiency of wastewater reuse plants with various treatment processes was studied using the present value of cost-benefit. When social benefits are considered, the capacity of 300㎥/ day was found to be economically effiecient. However, when private benefits are considered, the social benefit of wastewater treatment plant decreases because the private benefits do not include environmental expenses and other benefits which are included in social benefits. Therefore, when the private benefits are only considered, the economically efficient capacity of the wastewater reuse plant will be higher than that considering social expenses.
문헌정보 분석을 통한 탄소나노튜브 기술 개발 동향 분석(Ⅰ)
홍태환 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.4
The current status of rsearch and development on the nanotechnologies are reviewed by using literature information analysis.