http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
EGR 분배 개선 및 Cooled EGR 적용을 통한 질소산화물 저감효율 향상에 관한 연구
남동우(Dongwoo Nam),김태규(Taekyu Kim),이재욱(Jaewool Lee),전광민(Kwangmin Chun) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
자동차 배출가스 허용기준 강화에 따라 경유승용차 질소산화물 저감을 위해 Cooled EGR 시스템의 최적화와 정밀한 EGR 제어 및 연소실별 EGR 분배 편차의 개선 등이 요구되고 있다.<br/> 본 연구에서는 양산 HSDI 디젤기관을 대상으로 연소실별 EGR율의 분배편차를 측정하였으며 그 개선을 통해 EGR에 의한 질소산화물 저감효과를 향상시키고자 하였다. 각 실린더별 EGR율 측정을 위해 각 흡기포트에 장착된 샘플링 프로브로부터 흡입혼합기를 채취하여 분석함으로써 EGR의 분배 편차를 정량적으로 측정하였다. 그리고 EGR을 흡기 상류에 유입시키는 Premixed EGR 시스템을 적용하여 분배 편차를 개선함으로써 동일한 EGR율에서 질소산화물 저감 효과를 4-7% 향상시킬수 있었다. 또한, Cooled EGR 시스템을 함께 적용함으로써 질소산화물 저감효과를 동일한 EGR율에서 양산 엔진 대비 11-13% 향상시킬 수 있었다.
재혼에 관한 해외 연구 동향분석: 2008년~2017년 발간된 해외 논문을 중심으로
남동우 ( Nam Dongwoo ) 한국가족관계학회 2019 한국가족관계학회지 Vol.23 No.4
Objectives: The purpose of this study is to organize and analyze the oversea researches on remarriage and offer implications for future studies on remarriage in Korea. Method: A content analysis was carried out targeting 141 oversea journals and dissertations on remarriage published from 2008 to 2017. Results: The results from this research are as such: First, the volume on remarriage research publications have been increased since 2009. Second, research topics were classified into five areas such as remarried families, remarriage views and perceptions, senior remarriages, program and literature review. Third, the objects of the research are into five categories such as remarried family, remarried couple, remarried individual, remarried senior, not remarried people. Forth, the research methods used were classified into four categories such as quantitative research, qualitative research, combination of quantitative and qualitative research and literature review. Conclusions: Based upon these results, the implications and limitations of the study were discussed.
Effects of Transgenic Rice on Life History Traits of Daphnia magna in Life Table Experiments
Nam Sungjin,Dongwoo Yang,김창기,Sangkyu Park 한국생태학회 2007 Journal of Ecology and Environment Vol.30 No.4
To investigate the impacts of transgenic rice on freshwater organisms, we conducted two life table experiments using Daphnia magna for fifteen and twenty days, respectively. We examined life history traits such as population growth rates (r), reproductive rates (R0), generation times, and survivorship. In the first experiment, we used non-drought-stressed transgenic and non-transgenic rice harvested in 2005. In the second study, we used non-transgenic and transgenic rice harvested in 2006 following drought stress. Each experiment involved three treatments in which D. magna neonates were fed with Selenastrum capricornutum (control treatment) and S. capricornutum with 5% aqueous extracts of non-transgenic rice (N-T) and transgenic rice (T). In the first experiment, D. magna showed reduced population growth rates and lowered fecundity in the N-T and T treatments. In the second experiment, D. magna receiving both transgenic and non-transgenic rice extracts showed very high mortality, low population growth rates and reproduction rates. We could not detect any significant negative effects of extracts from transgenic rice on D. magna life history traits at 95%.
정동우(DongWoo Jeong),이봉준(BongJoon Lee),김길주(GilJoo Kim),TaeHyung Kim,SangDo Park,JinYoung Nam,Johan Svard,Peter Axelsson 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Neck Injuries Caused by Rear Crash are the most common accident type in motor vehicle accident. This study addresses Neck Injury protection system to deal with enhanced Neck Injury rating systems in Euro Ncap & Kncap. The Known factor to reduce neck injury is reducing relative movement between Head & Torso. This study is focused on reducing torso acceleration to minimize neck injuries by controlling seat back frame.
Lee, Dongwoo,Nam, Sung Min,Kim, Jeong-ah,Di Carlo, Dino,Lee, Wonhee American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.4
<P>Inertial microfluidics has drawn much attention not only for its diverse applications but also for counterintuitive new fluid dynamic behaviors. Inertial focusing positions are determined by two lift forces, that is, shear gradient and wall-induced lift forces, that are generally known to be opposite in direction in the flow through a channel. However, the direction of shear gradient lift force can be reversed if velocity profiles are shaped properly. We used coflows of two liquids with different viscosities to produce complex velocity profiles that lead to inflection point focusing and alteration of inertial focusing positions; the number and the locations of focusing positions could be actively controlled by tuning flow rates and viscosities of the liquids. Interestingly, 3-inlet coflow systems showed focusing mode switching between inflection point focusing and channel face focusing depending on Reynolds number and particle size. The focusing mode switching occurred at a specific size threshold, which was easily adjustable with the viscosity ratio of the coflows. This property led to different-sized particles focusing at completely different focusing positions and resulted in highly efficient particle separation of which the separation threshold was tunable. Passive separation techniques, including inertial microfluidics, generally have a limitation in the control of separation parameters. Coflow systems can provide a simple and versatile platform for active tuning of velocity profiles and subsequent inertial focusing characteristics, which was demonstrated by active control of the focusing mode using viscosity ratio tuning and temperature changes of the coflows.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2018/ancham.2018.90.issue-4/acs.analchem.7b05143/production/images/medium/ac-2017-051433_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac7b05143'>ACS Electronic Supporting Info</A></P>