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발작성심실성빈박을 수반한 Wolff - Parkinson - White 증후군 2 예
차경옥 ( Kyung Ok Cha ),권경민 ( Kyung Min Kwon ),박순일 ( Soon Il Park ),한원주 ( On Joo Han ) 대한내과학회 1969 대한내과학회지 Vol.12 No.11
Two cases of Wolff-Parkinson-White syndrome associated with paroxysmal ventricular tachycardia were reported. Case l. 19 years old male who had history of paroxysmal tachycardia for g years was admitted to Seoul Sanitarium and Hospital with complaints of d
차경옥 ( Kyung Ok Cha ),홍명호 ( Myeung Ho Hong ),이완석 ( Wan Suk Lee ),권경민 ( Kyung Min Kwon ) 대한내과학회 1969 대한내과학회지 Vol.12 No.11
One case of systemic lupus erythematosus is reported. 25 years old, unmarried female was admitted to this hospital with complaints of fever, arthralgia, myalgia, facial edema, vomiting, abdominal pain and diarrhea. She was recently operated on because of a
가정용 가스보일러의 소형 열교환기 유형에 따른 압력ㆍ속도분포특성에 관한 연구
최경석(Kyung-Suhk Choi),차경옥(Kyung-Ok Cha) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Heat transfer, pressure and velocity distribution for heat exchanger types of domestic gas boiler are different from shape, pitch. thickness of fm and array of pipe respectively. In order to measure the pressure and velocity distribution across the heat exchanger, a suction type wind tunnel was constructed and pressure, velocity distribution was measured for pitot tube(4 point) of rack type. The experiments were performed for 5 different air flow mass, Vinput= 0.7, 1.9,2.8,4.0,5.0 and transverse axis of heat exchanger(x-length) is 5cm respectively. Results showed that above 9.5 m/s. pressure distribution dispersion for wet type of heat exchanger is on the increase and above 5.5 m/s, pressure distribution dispersion for dry type of heat exchanger is on the increase. Also, pressure distribution dispersion by comparing two different types heat exchanger, dry type of heat exchanger showed a higher augmentation than wet type of heat exchanger.
과급 디젤엔진에서 선회비 변경에 따른 흡기 포트유동 및 엔진성능 특성에 관한 연구
윤준규,차경옥,Yoon, Jun-Kyu,Cha, Kyung-Ok 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9
The characteristics of intake port flow and engine performance with swirl ratio variance in a turbocharged D.I. diesel engine were studied in this paper. The intake port flow is important factor which have influence on the engine performance and exhaust emission because the properties in the injected fuel depend on the combustion characteristics. Through these experiments it can be expected to satisfy performance and emission by optimizing the main parameters; the swirl ratio of intake port, injection timing and compression ratio. The swirl ratio for ports was modified by hand-working and measured by impulse swirl meter. For the effects on performance and emission, the brake torque and brake specific fuel consumption were measured by engine dynamometer, NOx and smoke were measured by gas analyzer and smoke meter. The results of steady flow test are as follows; as the valve eccentricity ratio are closed to cylinder wall, the flow coefficient and swirl intensity are increased. Also we realized that there is a trade-off that the increase of swirl ratio decreases mean flow coefficient and increases the Gulf factor. And the optimum parameters to meet performance and emission through engine test are as follows; the swirl ratio 2.43, injection timing BTDC 13oCA and compression ratio 15.5.