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최두석 ( D. S. Choi ),공무갑 ( M. K. Kong ),신강연 ( K. Y. Shin ),최종오 ( J. O. Choi ),송장룡 ( J. R. Song ),최낙상 ( N. S. Choi ) 대한내과학회 1969 대한내과학회지 Vol.12 No.1
A case of the arsenical intoxication associated with gastrointestinal symtoms in a 26 years old Korean soldier man is reported. The patient was admitted to this hospital because of gastrointestinal disturbance, polyneuitic distress with incomplete loss of
초음파 연료공급장치용 디젤자동차의 성능 향상에 관한 연구(III) (과급 디젤기관에 대하여)
최두석(D. S. Choi),이흥영(H. Y. Lee),류정인(J. I. Ryu) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.4
To improve the performance of diesel automobile engine, we designed new fuel supply system named ultrasonic fuel supply system. The performance test of diesel automobile engine carried out to examine possibility of practical use of ultrasonic fuel supply system to test engine. This paper deals with the comparative results of performance test of diesel automobile engine in terms of smoke, HC, SFC, PS, thermal, efficiency, torque.<br/> Following are obtained result.<br/> 1) In naturally aspirated diesel engine, when we use ultrasonic fuel supply system output, fuel consumptions are improved and exhaust gas reduced significantly.<br/> 2) In turbo-charging diesel engine both using of ultrasonic fuel supply system and using of conventional injector, engine performance and exhaust gas temperature are almost constant.<br/> 3) In turbo-charging diesel engine, when we use ultrasonic fuel supply system, NOx are emitted approximately 3.5% higher than total average.<br/> 4) In turbo-charging diesel engine, when we use ultrasonic fuel supply system, smoke and CO are 17% and 11.8% improved respectively.
超音波 燃料供給裝置用 디젤自動車의 性能 向上 관한 연구(I) -초음파 연료공급장치를 통과한 연료의 분무특성에 대하여-
최두석(D. S. Choi),설진호(J. H. Seol),류정인(J. I. Ryu) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.1
This study carried out to investigate the spray characteristics of diesel oil through out ultrasonic fuel supply system in comparison with conventional.<br/> Size of the droplets comprising diesel spray was measured by immersed liquid method at different positions along the spray axis. Droplets distribution diagram was ploted and Sauter Mean Diameter(SMD) was also calculated.<br/> The effects of the ultrasonic vibration and injection pressure on the droplet size distribution and SMD were investigated. As the ultrasonic vibration supply SMD decreases on the same injection pressure condi-tions with conventional injector's. But the effect of ultrasonic vibration decreases with injection pressure increasing.
Clomiphene citrate 부하 검사나 과배란 유도를 시행한 여성에서 혈중 leptin 농도의 변화 양상에 관한 연구
최두석(Doo Seok Choi),이정원(Jeong Won Lee),유진경(Jin Kyung Yoo),윤병구(Byung Koo Yoon),이제호(Je Ho Lee) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.12
목적: Clomiphene citrate 부하 검사와 과배란 유도 주기에서 혈중 leptin 농도의 변화 양상을 규명하고 난포호르몬과의 상관 관계를 규명하고자 본 연구를 시행하였다. 방법: Clomiphene citrate 부하 검사를 시행하는 27명의 여성과 과배란 유도를 시행 할 14명의 여성을 대상으로 혈중 leptin 농도를 측정한 후 이를 체질량지수(body mass index)로 보정 후 leptin 농도의 변화 양상 및 혈중 난포호르몬과의 연관성을 분석하였다. 결과: 혈중 leptin 농도는 clomiphene citrate 부하 검사 주기의 각 측정시기에서 체질량지수와 유의한 연관성이 있었다(p<0.01). Clomiphene citrate 부하 검사 주기에서 leptin/체질량지수 치는 생리 3일과 10일에 비하여 중기황체기에 유의하게 증가되었고(p<0.05) 생리 주기의 규칙성에 따라 구분하였을 때 다른 양상을 보였다. Clomiphene citrate 부하 검사 주기와 과배란 유도주기의 난포기에서는 leptin/체질량지수 치는 증가하는 경향을 보였으나 통계적 유의성은 없었다. Clomiphene citrate 부하 검사와 과배란 유도 주기의 난포기에서 leptin/체질량지수 치와 난포호르몬 사이에 유의한 연관성은 관찰되지 않았다. 결론: 혈중 leptin 농도와 체질량지수 사이에는 유의한 연관성이 있다. Clomiphene citrate 부하 검사주기에서 중기황체기 leptin 농도는 난포기에 비해 유의하게 증가하였고, clomiphene citrate 부하 검사와 과배란 유도 주기에서 난소 자극 후 leptin 농도는 증가하는 경향을 보였으나 통계적 유의성은 없었다. 이들 결과로서 혈중 난포호르몬 농도는 혈중 leptin 농도에 주요한 영향이 없는 것으로 사료된다. Objective: To evaluate the changing pattern of serum leptin level and the correlation between estradiol level during the clomiphene citrate challenge test(CCCT) or controlled ovarian hyperstimulation(COH) cycle. Methods: Twenty-seven women who underwent CCCT and fourteen women who underwent controlled ovarian hyperstimulation were recruited to measure the serum leptin level. After correction of serum concentration with body mass index(BMI), changes of leptin level and correlation with serum estradiol level during CCCT and COH cycle were analyzed. Results: Circulating leptin levels were significantly correlated with BMI at each time point in CCCT cycle(p<0.01). In CCCT cycle, leptin/BMI level was significantly increased at midluteal phase compared to that of menstrual cycle day 3 and 10(p<0.05). In women with regular menstruation, leptin/BMI level at midluteal phase was significantly higher than that of menstrual day 3 and 10, but this difference was not seen in women with irregular menstruation. The leptin/BMI level in COH cycle showed increasing tendency throughout ovarian stimulation. But there was no significant correlation between leptin/BMI and estradiol level in CCCT and COH cycle. Conclusion: There is a significant correlation between BMI and circulating leptin level. Midluteal leptin level is significantly higher than that of follicular phase in CCCT cycle, and there is an increasing tendency in leptin level after ovarian stimulation in CCCT and COH cycle without statistical significance. These findings suggest that circulating estradiol concentration has no major influence on circulating leptin level.
[論文] 超音波 燃料供給裝置用 가솔린自動車의 性能向上에 관한 硏究(Ⅱ)
최두석(D. S. Choi),설진호(J. H. Seol),이홍영(H. Y. Lee),류정인(J. I. Ryu) 한국자동차공학회 1993 오토저널 Vol.15 No.3
This paper describes briefly the effect of ultrasonic fuel supply device on the performance of four stroke cycle gasoline engine. Experiments were carried out to clarify the effect of ultrasonic fuel supply device on the engine output, traveling fuel consumption ratio, exhaust emissions.<br/> The results were obtained as follows:<br/> 1. Engine output was increased 9~14 % in comparison with that of the conventional injector. 2. Travelling fuel consumption ratio was improved 17~29 % in comparison with that of the conventional injector.<br/> 3. CO, HC exhaust emissions was decreased compared to the value of the conventional injector. 4. Fuel consumption ratio in highway driving test was improved about 10 % in comparison with<br/> that of the conventional injector.
커먼레일 디젤기관에 초음파 조사 바이오디젤유 적용 특성에 관한 연구
최두석(Dooseuk Choi),정영철(Youngchul Jung),임석연(Seukyeon Im),류정인(Jeongin Ryu) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.1
The reformed bio-diesel fuel irradiated by the ultrasonic wave is applied to the diesel engine of common rail in common use recently. This study has the object to examine the properties of engine performance and discharged materials. The bio-diesel fuel is mixed and used with the diesel fuel in common use at the ratio of 20% or 100%. The ultrasonic energy is irradiated to the individually mixed fuel in order to reform the fuel. This fuel is applied to the engine in this experiment. And It is compared and analyzed from the experimental results with two cases irradiating the ultrasonic wave and no irradiating.
최두석(Doo Seuk Choi),원종호(Jong Ho Won) 대한공업교육학회 1991 대한공업교육학회지 Vol.16 No.1
The purpose of this study is to define the characteristics of high speed cylindrical grinding of SM20C steel with CBN wheel and WA wheel from 20m/sec to 80m/sec. The results were obtained as follows: (1) The grinding temperature of CBN wet grinding is lower than that of CBN dry grinding. It becomes more significant with high work speed and feed rate as well as great depth of cut. (2) The grinding temperature of grinding with WA is lower than that of grinding with CBN in low speed region, but it is reversed in high speed region. (3) The grinding temperature increases with increasing wheel speed up to 60m/sec, but in high speed region it decreases with increasing wheel speed.