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김희준(Huijun Kim),안숙희(Sukhee Ahn),지준범(Junbeom Jee),윤상후(Sanghoo Yoon) 한국데이터정보과학회 2020 한국데이터정보과학회지 Vol.31 No.2
집중호우와 같은 기상재해의 피해를 효율적으로 대체하기 위해선 강우의 정량적 추정이 필요하다. 기상청은 자동 기상관측장비와 강우 레이더를 이용하여 고해상도 정량적 강우 추정을 위한 자료를 수집하고 있다. 본 연구는 서울지역의 고해상도 강우량을 여러 공간보간법으로 추정하고 추정 결과를 비교하고자 한다. 공간보간방법으로 결정론적인 역거리가중법과 k-근접 이웃 알고리즘이 고려되었고, 확률론적인 일반화가법모형과 크리깅기법이 사용되었다. 크리깅기법은 지상 강우 자료만 이용한 정규크리깅과 지상 강우 자료에 레이더 자료가 함께 고려된 일반크리깅 그리고 회귀크리깅이 고려되었다. 예측성능을 평가하기 위해 리브-원-아웃 교차검증이 수행되었으며 평균제곱오차, 평균절대오차로 예측성능을 비교하였다. 연구자료는 2016년부터 2018년까지 여름철 (6월, 7월, 8월) 관측된 10분 단위 지상강우관측 자료와 강우 레이더 자료이다. 분석결과 역거리가중법이 서울지역의 공간적인 강우특성을 잘 반영하였으나, 강우 패턴에 따라 최정 공간보간법이 상이했다. 강우 레이더 자료는 강우가 소지역 또는 전지역에서 발생 시 도움이 되었다. Quantitative precipitation estimation is needed to reduce damages from weather disasters such as torrential rain. The Korea Meteorological Administration is using automatic weather observation equipment and radar to collect data for estimating high-resolution precipitation. This study is dealt with estimates of the quantitative precipitation using multiple spatial interpolation methods and compares the results. Inverse distance weight method and k-nearest neighborhood algorithm were considered as a deterministic approach and the general additive model and kriging methods were used as a stochastic approach. In order to evaluate the prediction performance, leave-one- out cross-validation was performed with the root mean squared error (RMSE), mean absolute error (MAE), and mean bias. The gauged and radar data during the summer season from 2016 to 2018 in Seoul were used. The results showed that the inverse distance weight method reflected the spatial rainfall pattern well. However, caution is needed because the best models vary depending on the pattern of rainfall in the sense of RMSE.
레이저 유도 백열법을 이용한 단기통 커먼레일 디젤 엔진 배기에서의 PM 크기 계측에 관한 연구
전홍식(Hongsik Chun),김희준(Huijun Kim),류훈철(Hoonchul Ryu),박종일(Jongil Park),한재원(Jaewon Hahn),전광민(Kwang Min Chun) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.3
Recently particulate matter (PM) emission regulations are becoming more strict for diesel engines. There is increasing interest for measuring not only concentration but also size of the particles. Laser-induced incandescence (LⅡ) has emerged as a promising technique for measuring particle volume fraction and size. In this study, the Simple Time Resolved-LⅡ method was applied to exhaust of Ethylene diffusion flame and diesel engine exhaust for measuring soot and PM size. The particle size data from LⅡ technique were calibrated using Field Emission Scanning Electron Microscope (FE-SEM) and Transmission Electron Microscope (TEM) photographs. In diesel engine experiments for particle size measurement, results from LⅡ measurement are in a good agreement with those from TEM photograph, and difference between two measurements was less than 16%.
LⅡ를 이용한 디젤 엔진 배기에서의 PM 일차 입자 크기 계측에 관한 연구
전홍식(Hongsik Chun),박종일(Jongil Park),김희준(Huijun Kim),류훈철(Hoonchul Ryu),한재원(Jaewon Hahn),전광민(Kwang Min Chun) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Recently particulate matter (PM) emission regulations are becoming more strict for diesel engines. There is increasing interest for measuring not only concentration but also size of the particles. Laser-induced incandescence (LⅡ) has emerged as a promising technique for measuring particle volume traction and size. In this study, the Simple TIRE-LⅡ(Simple Time Resolved-LⅡ) method was applied to diesel engine exhaust for measuring PM primary particle size. The panicle size data from LⅡ technique were calibrated using Transmission Electron Microscope (TEM) photographs. In diesel engine experiments for particle size measurement, results from LⅡ measurement are in a good agreement with those from TEM photograph, and difference between two measurements was less than 16%.