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수치해석을 통한 Spiral 형상 화학 반응기의 열전달 특성
정영국(Young-Guk Jung),이진규(Jin-Gyu Lee),이주한(Ju-Han Lee),서태범(Tae-Beom Seo) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.1
The purpose of the research is to develop the high performance solar chemical reactor for producing hydrogen using steam reforming reaction of methane. A specific shape chemical reactor is suggested:spiral type reactor. The reactor is installed on the dish-type solar thermal system of Inha University. The temperatures, CH₄ conversion rates, and H₂ proportion are measured. At specific condition, CH₄ conversion rates of the spiral type reactor are about 91%, and H₂ proportion are about 66%. The spiral type reactor gives reasonably good performance without any problems caused by highly concentrated solar radiation.
세파졸린의 경구투여를 위한 프로드럭의 개발 -세파졸린 에톡시카보널에칠 에스텔의 합성, 분배계수 및 항균력-
정영국,범진필,최준식,이진환,Jung, Young-Guk,Burm, Jin-Pil,Choi, Jun-Shik,Lee, Jin-Hwan 한국약제학회 1994 Journal of Pharmaceutical Investigation Vol.24 No.4
Cefazolin ethoxycarbonylethyl ester (CFZ-ET) was synthesized to improve oral absorption and bioavailability of the parent drug by esterification of sodium cefazolin (CFZ-Na). The successful synthesis of CFZ-ET was identified with analysis of UV spectra, FT-lR spectra and NMR spectra. Partition coefficient studies showed that CFZ-ET was more lipophilic than CFZ-Na and the ester was hydrolyzed into the parent drug in vivo. Although CFZ-ET did not have antimicrobial activity in vitro, the plasma taken after the oral administration of CFZ-ET had antimicrobial activity. Based on above observations, CFZ-ET might be rapidly hydrolyzed to CFZ in the body. Therefore, it may be concluded that CFZ-ET could be a novel prodrug of CFZ which can improve the bioavailability of CFZ-Na.
수치모델을 이용한 자동차 헤드램프 내부의 습기발생 현상 해석 연구
정영국(Young-Guk Jung),이주한(Ju-Han Lee),오상준(Sang-June Oh),서태범(Tae-Beom Seo) 대한전기학회 2010 전기학회논문지 Vol.59 No.5
Increasing styling features for automotive headlamps speed up the focus of understanding condensation at inner surfaces. Water vapor condensation on the inside surface of the headlamp lens is an essential factor that affects secure front view and headlamp life. One of the headlamps of automobile which is one of the most popular in Korea was chosen for the present analysis. In the basis of the experimental data of automobile given by a manufacturer, boundary conditions were defined and free convection of the air inside the headlamp and radiation from the bulb to the other surfaces are considered. As a result, temperature distribution of the inside surface of the headlamp lens are approximately the same as the experimental result.
정영국(Jung Young-Guk),이주한(Lee Ju-Han),서태범(Seo Tae-Beom) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
The purpose of the research is to develop the high performance solar chemical reactor for producing hydrogen using steam reforming reaction of methane. A specific shape chemical reactor is suggested: spiral type reactor. The reactor is installed on the dish-type solar thermal system of Inha University. The temperatures, CH₄ conversion rates are measured. At specific condition, CH₄ conversion rates of the spiral type reactor are about 92%. The spiral type reactor gives reasonably good performance without any problems caused by highly concentrated solar radiation.
고온 태양열을 이용한 2단계 열화학 사이클의 수소생산(Ⅱ)
동재용(Jae Yong Dong),김태준(Tae Jun Kim),정영국(Young Guk Jung),오상준(Sang Jun Oh),이주한(Ju Han Lee),서태범(Tae Beom Seo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
본 연구에서는 집광된 태양복사에너지를 열원으로 사용히고 NiFe₂O₄/m-ZrO₂를 입힌 다공성 물질을 물 분해 장치로 사용한 수소생산시스템의 실험을 수행하였다. 집광장치로 5㎾<SUB>th</SUB> 급의 접시형집광장치(인하대학교, 인천, 송도)를 사용하였으며 반응에 필요한 온도(1100℃~1600℃)를 견디기 위한 반응기 설계를 수행하였다. 실험을 통해 인공광원을 이용하여 성능이 평가된 촉매가 담지된 다공성 물질에 대한 실제 일사조건에서의 수소생산성능을 평가하고자 하였다. 실험결과 5회의 연속적인 물 분해 수소생산 사이클을 유지하였으며 수소생산량 및 페라이트의 전환율에 대한 분석을 수행하였다. This study present the results of experiment of hydrogen production with the thermochemical two-step water splitting cycle using solar heat. Chemical reactor was designed to be used for operating with dish type solar thermal system. Scaled-up device, performance verified on hydrogen production in laboratory scale experiment, was tested by dish type solar thermal system in field. The optimum temperature of reactions was examined by solar thermal simulator and this temperature was used as a reference value during the system operation in field. The foam device NiFe₂O₄/m-ZrO₂ powder was successful with respect to hydrogen production through 5 repeated cycles.
신예원(Shin Ye-won),김태준(Kim Tae-jun),정영국(Jung Young-guk),이진규(Lee Jin-gyu),서태범(Seo Tae-beom) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
Two-step water splitting process experiment is performed using concentrated solar radiation of dish type solar thermal system. The foam device coated with NiFe₂O₄/m-ZrO₂ powder was used as a water splitting device and a solar thermal converter. The inner part of the reactor designed to withstand 1600℃ above and composed with alumina-oxide. The performance of device is examined by estimation of hydrogen production rate on consecutive two-step cycles. Optimum reaction temperatures of the oxygen releasing and hydrogen generation reactions with Ni-ferrite, examined with solar thermal simulator, are 1400℃ and 1100℃, respectively. And these reaction conditions are validated with solar thermal system in field. Reaction time of T-R step and W-D step were adjusted with field conditions. For the 1st cycle(oxygen releasing step) time 60min at around 1400℃ of foam device temperature and 2nd cycle(hydrogen generation step)time was 30min at around 1100℃ of foam device temperature(60min and 30min are optimized reaction time in lab with solar thermal simulator and these reaction times are adjusted in this study). As a result, the after end of a 2nd cycle, the crack is created at foam device. The total volume of hydrogen production with 1st cycle is 782.87㎖ and 2nd cycle production is 48.71㎖. The hydrogen production rate is decreased at repeated cycles. Also the ferrite conversion is decreased 87.39% to 5.44%.
이진환,최준식,범진필,정영국 한국약제학회 1994 Journal of Pharmaceutical Investigation Vol.24 No.4
Cefazolin ethoxycarbonylethyl ester (CFZ-ET) was synthesized to improve oral absorption and bioavailability of the parent drug by esterification of sodium cefazolin (CFZ-Na). The successful synthesis of CFZ-ET was identified with analysis of UV spectra, FT-IR spectra and NMR spectra. Partition coefficient studies showed that CFZ-ET was more lipophilic than CFZ-Na and the ester was hydrolyzed into the parent drug in vivo. Although CFZ-ET did not have antimicrobial activity in vitro, the plasma taken after the oral administration of CFZ-ET had antimicrobial activity. Based on above observations, CFZ-ET might be rapidly hydrolyzed to CFZ in the body. Therefore, it may be concluded that CFZ-ET could be a novel prodrug of CFZ which can improve the bioavailability of CFZ-Na.