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디젤연료 열분해 매연 입자 생성기를 이용한 DPF 담체의 Nano-PM 정화 효율 비교
김종훈(Jonghun Kim),오광철(Kwangchul Oh),김덕진(Deokjin Kim),이천환(Chunhwan Lee),이춘범(Chunbeom Lee),고상철(Sangchul Ko) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The experiment of diesel pyrolysis has been performed to clarify the soot formation process without oxidation. The influences of temperature, residence time on soot formation have been investigated with the particle size distribution, thermal analysis and C/H ratio. The results show that soot formation from diesel pyrolysis strongly depends on both temperature and residence time. The critical temperature for soot evolution is about 1100℃, of which primary particle diameter is about 20 ㎚. As the temperature and residence time increase, diesel soot became more matured particle, i.e. the higher C/H ratio and the larger particle size, and the higher ignition temperature. The well organized soot generator have been used in the investigation of Nano PM filtration efficiency of developed Si₃N₄ DPF.
김종훈 ( Jonghun Kim ) 한국교육과정학회 2017 교육과정연구 Vol.35 No.4
국가 수준의 교육과정 체제를 따르는 우리나라의 경우, 교사의 교육과정 실행은 국가에 의해 개발된 교육과정에 그 기반을 두고 있다. 그러나 교실의 상황과 맥락, 학습자의 요구와 수준, 교사의 신념과 가치 등의 다양성과 복잡성을 고려할 때, 국가수준의 교육과정이 학교와 교실에서 실행되는 양상은 저마다 다른 모습을 취할 수밖에 없다. 교사는 주어진 교육과정을 있는 그대로 전달하는 것이 아니라, 실천 맥락에 적합하도록 이를 변경하거나 수정하게 된다. 교육과정 연구 및 실천 분야에서 이와 같은 교사의 실천 행위는 흔히 ‘교육과정 재구성’으로 일컬어져 왔다. 이 글은 교육과정 재구성 실천 경험을 통해 교사들이 형성한 교육과정 재구성의 의미를 탐색하기 위한 목적을 가지고 있다. 이를 위해 비교적 오랜 기간에 걸쳐 교육과정 재구성을 실천해 온 두 명의 초등학교 교사의 이야기를 기반으로, 교육과정 재구성이 그들에게 있어 어떤 의미인지를 내러티브 탐구 방법을 통해 분석하고자 하였다. 이러한 시도는 교사의 경험과 교수 실천의 의미를 보다 심도 있게 이해함으로써 교사교육에 주는 시사점을 모색할 기반을 마련한다는 점에서 의의를 갖는다. In Korea, which follows the national-level curriculum system, teacher curriculum implementation is based on the curriculum developed by the nation. However, given the diversity and complexity of schools' and students' needs and levels, as well as teachers' beliefs and values, the way in which the national curriculum is implemented varies. A teacher does not deliver the given curriculum exactly as it is, but modifies it to fit the context of their teaching practice. In the field of curriculum research and practice, this has often been referred to as “curriculum reconstruction.” The purpose of this study is to explore teachers' meaning-making through their experience of curriculum reconstruction. To do this, the study investigates the meaning of curriculum reconstruction to teachers through the narrative inquiry method based on the story of two elementary school teachers who have practiced curriculum reconstruction for a relatively long period of time. This is significant as it provides a basis for exploring the implications for teacher education by examining the meaning of teachers' experiences and teaching practice.
디젤연료의 열분해를 이용한 매연 입자 생성에 대한 연구
김종훈(Jonghun Kim),오광철(Kwangchul Oh),남연우(Younwoo Nam),이천환(Chunhwan Lee),이춘범(Chunbeom Lee),고상철(Sangchul Ko) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The experiment of diesel pyrolysis has been performed to clarify the soot formation process without oxidation. The influences of temperature, residence time and lube oil addition on soot formation have been investigated with the particle size distribution, morphology, thermal analysis and C/H ratio. The results show that soot formation from diesel pyrolysis strongly depends on both temperature and residence time. The critical temperature for soot evolution is about 1100 oC, of which primary particle diameter is about 20 ㎚. As the temperature and residence time increase, diesel soot became more matured particle, i.e. the higher C/H ratio and the larger particle size, and the higher ignition temperature. The carbonization process of diesel soot through pryrolysis is also found to be weakly affected by dosing of 5 % lube oil to diesel fuel. The results could provide not only an information for the modelling of diesel soot formation without oxidation but also the methodology on the design of soot generator for the after treatment system.