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Numerical studies of the oxygen and air combustion performance in a Corner-type coal fired boiler
이인철(Lee, Incheol),장석원(Jang, Seokwon) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Three dimensional numerical analysis of the oxygen and air were performed to investigate the combustion characteristics in a Corner-type pulverized coal boiler. With the actual operation data of the power plant, the distribution of velocity, gas temperature, O², CO₂, H₂O, N₂ as well as the particle tracking in the boiler were investigated. The predicted values at the outlet of furnace for the gas temperature and major species concentrations gave a good agreement with the designed values. The present analysis on combustion characteristics in a boiler would provide the useful information for the stable boiler operation and in trouble shooting boiler problem.
원어민 보조교사 활용이 중학교 영어 듣기 교육에 미치는 영향 연구
이인철 ( Incheol Lee ),강문구 ( Munkoo Kang ) 한국중등영어교육학회 2013 중등영어교육 Vol.6 No.2
This study examined the effect of a native English speaker assistance program on middle school English education, especially on listening comprehension and affective domain. The input of the native English speaking assistant teacher provided a good opportunity for the learners to enhance their communicative competence and develop a positive attitude in class. In the initial stage, when they rarely spoke with the native English speaker, they were likely to be demotivated, and this may have resulted in producing unfavorable consequences. When the assistant teacher taught the students alone, he found it difficult to interact with the learners; but, when the Korean English teacher and the assistant teacher worked together, they were able to share more significant interactions with the students. The interpersonal relationship between the native English speaking assistant teacher and students improved through the help of the Korean English teacher; and, when the classroom was managed in a positive manner, the students’ learning set and listening comprehension made the best progress. Although it is not easy to employ native English speakers as teachers for administrative or financial reasons, students should be given more chances to talk with native English speaking teachers in order to develop better communicative competence. For this system to take root and bear fruit, it is necessary to make discreet, far-reaching research efforts from diverse perspectives.
태동현(Donghyun Tae),이인철(Incheol Lee),이주광(Jugwang Lee),김승호(Seungho Kim),노대석(Daeseok Rho),강민관(Mingwan Kang) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
K 연료전지발전소는 58[MW]의 전력을 생산하는 대용량 연료전지발전 시스템으로서, 154 /13.8[kV] 계통에 연계되어 운용되고 있다. 그러나 운전 중 고조파와 서지 등에 의해 다수의 제어 및 통신 소자가 소손되는 사고가 발생하여, 이에 대한 대책이 요구되고 있다. 따라서, 본 논문에서는 제어 및 통신 소자의 소손을 야기하는 원인 중 하나인 고조파를 저감시키기 위하여 단일 동조 필터의 설계 알고리즘을 제안하였다. 제안한 알고리즘을 바탕으로 고조파 필터를 설계하여 시뮬레이션을 수행한 결과, 계통에서 문제가 되는 고조파 성분이 저감되는 효과를 확인하였다.