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HC-SCR 시스템을 적용한 디젤 자동차의 NOx 저감에 관한 연구
정희석(Heesuk Jeong),김덕진(Deokjin Kim),오광철(Kwanchul Oh),권봉수(Bongsu Kwon),이천환(Chunhwan Lee),김태민(Taemin Kim),이해수(Haesoo Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The diesel engine reduces NOx that is one of toxic substances. It is well known that EGR, Urea-SCR, and HC-SCR for reducing the NOx. EGR technology have fuel efficiency problem, and Urea-SCR technology have issues that is the infrastructure as well as the safekeeping of a reducing agent in spite of the commercialized technology. From the point of view saving petroleum resources, HC-SCR has a good point because of using the diesel as the reducing agent, although the purifying efficiency is lower. Accordingly in this paper, we found how to upgrade the quality of HC-SCR technology for improving the purifying efficiency, and reported the experimental result with applying the proposed method to real vehicles.
문법 학습 전략 사용과 수용적 영어 문법 능력 사이의 관계
정희석 ( Jeong Heesuk ),오준일 ( Oh Junil ),김은지 ( Kim Eun-jee ) 한국중등영어교육학회 2017 중등영어교육 Vol.10 No.1
This study was designed to explore the grammar learning strategies used by Korean high school students and their effects on receptive knowledge of English grammar. A total of 107 second-year female high school students in Busan were asked to complete a grammar learning strategy questionnaire and an English grammar test. Statistical analyses demonstrated that grammar learning strategies could be classified into strategies for implicit grammar learning and those for explicit grammar learning, and that the subjects used the former significantly more often than the latter. It was also found that grammar learning strategies had potential to positively contribute to receptive grammatical knowledge. Pedagogical implications of the study are discussed, and directions for future research are suggested.