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Urea-SCR 시스템의 히팅장치 설계를 위한 빙결된 Urea 수용액의 해동 특성에 관한 연구
황재순(Jaesoon Hwang),허형석(Hyeongseok Heo),이천환(Chunhwan Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Among the after-treatment systems, urea-SCR system is one of the most efficient techniques to reduce nitrogen oxides emitted from diesel engines. However, urea-water solution is frozen at low ambient temperature level of below -11℃. The purpose of this study is to understand melting phenomena and to compare the melting characteristics between the two geometries - one is coil type and the other is zigzag type - of heater using engine coolant. Performance of the two kinds of heaters is analyzed by numerical study. It was found that melting time of zigzag type heater is shorter than coil type heater.
방향성 필터링을 이용한 질감영상의 영역분할에 관한 연구
허형석,장민혁,천종훈,박승진,박종안 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.1
The matrix method using the statistical property in analyzing a texture image requires large memory and a lot of operation time, but has the property data of the image. Many research results have announced in order to apply the property data to image analysis. In this paper, a orientational filtering method for analyzing texture image is considered. After texture image is filtered by the 4-orientational matrix data, the segmentation is executed by clustering the output image. The experiment result shows that the proposed technique clusters effectively synthetic texture image.