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이환철,김동원,황혜정,김부미,김선희,이형주 한국학교수학회 2013 韓國學校數學會論文集 Vol.16 No.4
본 연구는 수학교육 선진화 방안(‘12.1)에 따라 중 고등학교 수학교사가 내신 평가문항을 출제함에 있어 유념해야할 개발 절차를 안내하는 것을 목적으로 하였다. 연구 결과, 평가문 항 개발 가이드라인을 크게 ‘지도 내용 분석 과정’, ‘평가 문항 구성 과정’, ‘평가 문항 완성 과정’으로 범주화하여 제시하였다. 본 연구의 적용 과정에서 연구 결과가 수학교사의 평가전 문성 신장에 기여할 것이며 교사의 평가문항 출제 후 자기진단 도구로도 활용될 수 있음을 확인하였다. This study aims to suggest a Guide-Line for Assessment Items Development in Middle and High School Mathematics that was included in the plan for advancement of mathematics education(2012). Consequently, we categorized a Guide-Line for Assessment Items Development as three process: 'Lesson content analysis process', 'Assessment items making process', 'Assessment items completed process'. This study will contribute to improve teacher's assessment professionalism and can be used as self-diagnosis tools.
시나리오 플래닝을 활용한 설계VE 제안의 가치평가 모델 개발
이환철(Lee Hwan-Cheol),현창택(Hyun Chang-Taek),손명진(Son Myung-Jin),지성민(Ji Soung-Min) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.4
After the VE analysis method has been applied to domestic construction industry, the design VE proposal was carried out to design related to various facilities. In this VE activities, The two key elements to elicit these VE proposals are 'Function' and 'Cost' which are needed in assessing grade of VE's value. However, when it is hard to calculate the money that is connected to existing or improved one, not only owner can't measure the proposals of the VE's value due to it is not available to calculate the quantitative value that is related to the 'Cost' but also it could be an impedimental cause when users make a decision. Therefore, in this study sought a plan what could take out the quantitative figures that is related to the 'Cost' and suggested the way to calculate the 'Cost'. Before developing a model of evaluation value, I has understood the type of suggestion of VE which are difficult to estimate the cost of the first construction and improved 3 scenarios using with the techniques of analyzed classes and scenario planning. And adapted rating step process with the improved scenarios then developed the model of evaluating value. Furthermore, I applied example projects to examine the developed the model of evaluating value's applicability. Plus, I investigated a possibility of applicability on the field through VE experts' interview survey. The model of evaluating value using the developed scenarios in this study gave a direction to calculate the cost that is difficult to calculate. Also I expect that it would be available to perform systematic and rational decision making.
Exploring the Future Direction of Math Education in AlgeoMath
이환철 영남수학회 2019 East Asian mathematical journal Vol.35 No.4
The Korea Foundation for the Advancement of Science and Creativity(KOFAC) developed AlgeoMath, a dynamic geometry software, with support from the Ministry of Education and 17 municipal and provincial education offices. Starting Nov. 7, 2018, AlgeoMath can be used for free by anyone. This study summarizes various discussions on the future direction of math education. The four aspects of the curriculum, textbook, teaching and learning, and assessment were explored on how AlgeoMath could contribute in realizing the future direction of math education. We confirmed that AlgeoMath can faithfully fulfill its role as a tool for changing math education, and we looked at what should be emphasized more and what should be complemented.
이환철,양재웅,안재우 대진대학교 1995 大眞論叢 Vol.3 No.-
The etching characteristics of r.f.-sputtered permalloy magnetic thin films using ion beam apparatus are investigated. The process parameters investigated during ion beam etching are accelerating voltage, beam voltage and beam current. The etch rate of the permalloy films is proportion to the beam current, but it is not directly related to the accelerating voltage and beam voltage. The dependence of etch rate on the process parameters can be explained by the ion beam current density. It is found that the ion beam etching is on effective method in obtaining well-developed micropatterns on the permalloy thin films.
물을 전기분해하여 제조한 수소/산소 혼합가스의 특성에 관한 연구
이환철,정목근 대진대학교 신과학연구소 1998 신과학연구 Vol.1 No.-
물을 전기분해하여 제조한 수소/산소 혼합가스의 응폭특성과 연소특성에 관해 연구하였다. 자동차용 점화코일을 이용한 고압방전장치를 제작하였으며, 이를 이용하여 응폭실험을 행한 결과에 따르면 강력한 외부로의 폭발이 있고난 후 진공이 형성되면서 응폭현상이 일어남을 확인할 수 있었다. 그러나 응폭특성이 수소/산소 혼합가스만의 유일한 특성인가에 대해서는 현재 결론을 내리기에는 어려운 실정이다. 또한 텅스텐금속의 연소실험결과에 따르면 수소/산소 혼합가스나 산소-LPG가스 모두 텅스텐금속을 연소시킬 수 있으므로,실제로는 대기중의 산소와 텅스텐금속이 산화반응을 일으켜 텅스텐산화물이 형성됨에 따라 녹는점이 1400-1600℃로 낮아진 결과로 판단되지만 보다 정확한 결론을 내리기 위해서는 좀 더 많은 연구가 필요하다고 판단된다.
이환철,이재헌,Hwan Cheol Lee,Jae-Heon Lee 한국플랜트학회 2023 플랜트 저널 Vol.18 No.4
In this study, to increase the methane content of biogas supplied from Nanji Water Regeneration Center and to purify impurities, a three-stage membrane purification process was designed and installed to demonstrate operation. The methane concentration of biomethane produced in the 2 Nm3/h purification process was set to three cases: 95%, 96.5%, and 98%, and the membrane area ratio of the membrane was 1:1, 1:2, 1:1:1, The optimum conditions for the membrane area of the separator were derived by changing to five of 1:2:1 and 1:2:2. 3 stage separation membrane process of 30 Nm3/h was installed to reflect the optimum condition of 2 Nm3/h, and biomethane production of 98% or more of methane concentration was demonstrated. As a result of the operation of the 2 Nm<sup>3</sup>/h refining device, the methane recovery rate at the 98% methane concentration was 95.6% when the membrane area ratio was 1:1 as the result of the two-stage operation of the separator, and the recovery rate of methane at 1:2 was increased to 96.8%. The methane recovery rate of the membrane three-stage operation was highest at 96.8% when the membrane area ratio was operated at 1:2:1. The carbon dioxide removal rate was 16.4 to 96.4% and the 2:2 to 95.7% film area ratio in the two-step process. In the three-step process, the film area ratio was 1:2:1 to 95.4%, and the two-step process showed higher results than the three-step process. In the 30 Nm3/h scale biogas purification demonstration operation, the methane concentration after purification was 98%, the recovery rate of methane was 97.1%, the removal rate of carbon dioxide was 95.7%, and hydrogen sulfide, the cause of corrosion, was not detected, and the membrane area ratio was 1:2:1 demonstration operation, biomethane production with a methane concentration of 98% or higher was possible.