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오용일(Yong Il Oh),표영덕(Young Duk Pyo),권옥배(Ock Bae Kwon),백영순(Young Sun Beak),조상현(Sang Hyun Cho),임옥택(Ock Taeck Lim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.4
본 연구에서는 대형버스 배기가스 테스트 모드인 JE-05 에서 DME와 디젤을 연료로 사용하는 대형 DME버스를 차대동력계, 배기가스 분석기 그리고 PM 측정시스템을 이용하여 대형 DME버스의 연비, 배기가스특성 그리고 동적 특성에 대해 알아보았다. 대형 DME버스에는 6기통 8,071cc 디젤엔진이 장착되었으며, 현재 운행되고 있는 상용 디젤버스와는 달리 DOC, DPF와 같은 후처리 장치가 없다. 실험 결과, 각 부하에 따른 차량의 속도를 통하여 차량의 동적 특성은 DME와 디젤을 사용했을 때 거의 비슷한 것을 알 수 있었다. NOx, CO와 THC는 DME를 연료로 사용 시 디젤연료에 비해 더 적게 배출되는 것을 확인하였다. 하지만 PM은 DME연료를 사용 시 거의 발생하지 않았는데, 이는 DME가 함산소연료이고 분자구조상 탄소-탄소 결합이 없기 때문이라고 생각된다. CO₂는 각 연료 사용 시 비슷하게 발생하였으며, 저위발열량 베이스로 계산된 연비는 DME연료 사용 시 디젤연료보다 약 6.7% 더 낮게 나왔다. The experimental test was conducted for a heavy-duty DME bus in JE-05 exhaust gas test mode using a chassis dynamometer, exhaust gas analyzers, and a PM measurement system. The heavy-duty DME bus was not equipped with after-treatment systems such as DOC or DPF. The dynamic behavior, emission characteristics, and fuel economy of the bus were investigated with an 8.0-liter, 6-cylinder conventional diesel engine. The results showed that the dynamic behavior in DME mode was almost the same as in diesel mode. However, there was little difference among the two operation modes for NOx and CO emissions. THC emissions were lower for DME mode than for diesel mode. Also, the amount of PM emissions was remarkably lower than for the diesel mode because DME contains a greater amount of oxygen than diesel. The data showed that CO₂ emissions were almost similar in the two modes but fuel economy (calculated using heating value) was lower for DME mode than for diesel mode.
LPG 프리피스톤 리니어엔진의 스프링강도에 따른 운전특성에 대한 수치해석 연구
왼바흥(Nguyen Ba Hung),오용일(Yong Il Oh),임옥택(Ock Taeck Lim) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-1
This paper presents a simulation research about free piston linear engine (FPLE) fueled with LPG include 30% propane and 70% butane. There are two simulation models are used in the research including dynamic model and thermodynamic model These models are combined and solved by Fortran. The effects of spring hardness on the motion characteristic of piston are studied. The simulation results show that, by increasing spring hardness, the velocity as well as the motion frequency of piston is higher.
Simulation of a Free Piston Linear Engine fueled with LPG
Nguyen Ba Hung,Yong Il Oh(오용일),Ock Taeck Lim(임옥택) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper presents a simulation research about free piston linear engine (FPLE) fueled with LPG include 30% propane and 70% butane. Dynamic model, linear alternator model and thermodynamic model are used as the numerical models to predict motion of piston, in-cylinder pressure and generated electric power of FPLE. The spark timing and air gap length are changed to provide information for the prediction. The result of this research is divided by two parts include motoring mode and firing mode. The result at motoring mode showed that there is validation between simulation and experiment for volume and pressure in cylinder. In regard to firing mode, by increasing spark timing, the velocity of piston, peak pressure and electric power increase respectively. Beside, by increasing air gap length, the velocity of piston change insignificantly, however both the peak pressure and electric power decrease respectively.
최은영,강성귀,김해강,오용일,오강열 대한내과학회 1986 대한내과학회지 Vol.31 No.4
Long-term hemodialysis and renal transplantation have led to a significant prolongation of life in patients with uremia of chronic renal disease. These patients are at risk of development of renal cystic disease and renal neoplasms. Identification of cysts and solid tumors in the kidneys of long-term dialysis patients can be preformed easily and correctly by abdominal CT scanning. Here we report one case of acquired renal cystic transformation in a long-term dialysis patient. He is 58-year-old man with chronic renal failure secondary to diabetic nephropathy. He has been treated by hemodialysis for 5 years. Physical examinations were negative. The urea nitrogen was 68.9 mg%, the creatinine 13.1 mg%, the sodium 137mEq/l, the potassium 6,6 mEq/l, the phophorus 5.9 mg%, and the hemoglobin 8.8g%. We found multiple cystic lesions in both kidneys by abdominal CT scanning on January 1986.