http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
CO₂ 레이저 광의 조사조건에 따른 치아의 치수강내 온도상승에 관한 연구
고동섭(D.S. Ko),박용환(Y.H. Bak),신상훈(S.H. Shin),엄효순(H.S. Eom),김웅(U. Kim),이찬영(C.Y. Lee) 한국광학회 1990 한국광학회지 Vol.1 No.2
본 연구에서는 레이저와 치아조직과의 상호작용에 대한 연구의 일환으로, CO₂ 레이저의 발진파장인 10.6㎛의 레이저 빔 조사시에 일어나는 치아의 온도변화를 조사하기 위하여 CO₂ 레이저 발진장치를 제작하여 여러 가지 조사에너지, 조사시간에 대하여 발거된 치아의 치수강의 온도변화를 측정 분석하였다. 측정한 data를 분석하여 최대 상승온도 ΔTm를 추정할 수 있는 다음과 같은 실용적인 경험식을 얻었다.<br/> ΔTm=αPΔτexp(-βd)<br/> 여기서 P는 레이저의 출력(W)이고 Δτ는 조사시간(sec), d는 치아의 두께(㎜)이다. This study was performed to obtain fundamental data on temperature increases in the dental tissues irradiated by 10.6㎛ laser radiation. For this purpose a experimental facility was established, which was composed of a CO₂ laser, a shutter unit and a temperature sensing device. The temperature changes in the pulp chamber of extracted molars, during and after the laser irradiation, were measured as function of laser power, the time of irradration and the thickness of the sample. An empirical formula for the maximum temperature increases. ΔTm was derived from the measured data as follows;<br/> ΔTm=90PΔτ exp(-1.5d)<br/> where P. Δτ rand d are the laser power(W), irradiation time(sec) and the thickness(㎜) between pulp chamber and occlusal surface, respectively.<br/> Also a theoretical calculation model based on simplified assumptions were established and the results from the calculation were compared with the measured temperature data. A fairly good agreement was obtained.
레이저유도형광법을 이용한 엔진실린더내 연료분포 측정기법 연구
오승묵(S.M.Oh),조규백(G.B.Cho),고동섭(D.S.Ko) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Two dimensional images of mixture distributions in a optical accessible engine was acqured during intake and compression processes using planar laser-induced fluorescence(PLIF). A optical glass filter(WG305) was used to eliminate Rayleigh scattering and the fluorescence was imaged onto ICCD camera. The engine was fueled with iso-octane, which was mixed with 5% commercial gasoline as a dopant and operated under idling conditions. The fuel injection timings were differed at 0, 360, 450deg and the amount of injection was varied as A/F=17.5 and 18.5. The dopant fluoresced by the change of mixture concentrations inhomogeneously. The late injections showed more homogeneous distributions during compression process.<br/>
[가솔린엔진] 엔진연소실에서 평면레이저유도형광법을 이용한 OH 라디칼 측정 연구
오승묵(S.M. Oh),고동섭(D.S. Ko) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Two dimensional images of OH radical distributions in an optical accessible engine were acquired using planar laser induced fluorescence(PLIF) method during combustion process. A broadband filter(UG 11) was used to eliminate Rayleigh scattering from laser light and OH fluorescence was imaged onto ICCD camera. OH radical is excited on Q₁(11) and P₂(8) line. The engine was fueled with special grade iso-octane, which does not fluorescence. Wrinkled flame fronts which imply turbulent flame is very clear. In some images flame islands are observed.