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승용디젤엔진용 DPF 내 Ash 퇴적량 학습 보정 기능에 관한 실험적 연구
노영준(Youngjun Roh),이재연(Jaeyeon Lee),홍현준(Hyunjun Hong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Ash correction process of DPF system generally leads to time-consumed efforts and inaccurate results because ash deposit characteristics are varied by driving mode or maintenance condition of each vehicle. This hinders the success of overall DPF calibration works and, thus, must be improved. This paper presents the experimental results of new ash learning methodology, which predicts the pressure drop caused by ash deposit, optimized by DFSS method. It is also showed that filter effective volume can be estimated by filter and ash coefficients obtained from ash learning.
디젤 매연 필터에서 퇴적되는 입자상 물질의 퇴적량 예측
유준(Jun Yu),김영직(Youngjik Kim),전제록(Jerok Chun),홍현준(Hyunjun Hong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel particulate filter (DPF) has been developed to optimize engine out emission, especially particulate material (PM). One of the main important factors for developing the DPF is estimation of soot mass being accumulated inside the DPF. Monitoring of pressure drop over the DPF is a simple way to evaluate the accumulated soot mass but its accuracy is known to be limited to a certain vehicle operating condition. To compensate drawback of the method is adoption of integrating time history of the engine out PM and burning soot. Present study demonstrates current status of the soot estimation methods including the results from the engine test benches and vehicles.
윤소연(Soyeon Yoon),김미주(Mijoo Kim),김민범(Minbum Kim),홍현준(Hyunjun Hong),송기재(Keejae Song) 대한두경부종양학회 2018 대한두경부 종양학회지 Vol.34 No.2
Malignant salivary gland tumors only represent 0.08% of all childhood tumors. Especially, nasopharyngeal mucoepidermoid carcinoma(MEC) in pediatric age is an extremely rare malignancy. We hereby report a case of nasopharyngeal MEC in 5 year-old female patient. The patient underwent the complete removal of the tumor by endonasal endoscopic approach. Adjuvant postoperative radiotherapy was not considered. After 3.5 years of follow-up, there are no sign of recurrence and metastasis. Minor salivary gland tumor must be considered as a differential diagnosis of angiofibroma in nasopharynx in pediatric age. To our knowledge, the case we describe is the third case of nasopharyngeal MEC in pediatric age reported in literature.