http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Urokinase Immobilized on Cellulose Membrane
김현표,김남득,염영일,변시명,Kim, Hyun-Pyo,Kim, Nam-Deuk,Yeom, Young-Il,Byun, Si-Myung 생화학분자생물학회 1986 한국생화학회지 Vol.19 No.2
인공신장기에 쓰이는 셀룰로오즈 막에 시아노겐 브로마이드방법을 이용한 공유 결합법으로 혈전용해 효소인 유로키나제을 고정화 시켰다. 단순 흡착시킨 유로키나제가 $17-30{\times}10^{-3}$ CTA unit/cm의 활성을 냈으나 계속 사용할 수 없었고 안정성이 전혀 없는 반면, 고정화된 유로키나제는 $19-38{\times}10^{-3}$ CTA unit/cm 의 활성을 보유하였으며, 높은 안정성을 갖고 있는 것으로 판명되어 임상적 사용의 가능성을 높여 주었다. Urokinase was covalently immobilized to a cellulose hollow fiber membrane with the method of CNBr-activation. The resulted immobilized urokinase showed $19-38{\times}10^{-3}$ CTA unit/cm fiber compared to $17-30{\times}10^{-3}$ CTA unit/cm fiber of the simply adsorbed urokinase which showed the least stability during repeated use. The fibrinolytic activity of the immobilized one was very stable and the immobilized fiber promised a potential clinical use.
단신 : 반응표면분석법을 이용한 Arthrobacter sp. PAMC 25486의 카로티노이드 생산배지 최적화
김현도 ( Hyun Do Kim ),최종일 ( Jong Il Choi ),한세종 ( Se Jong Han ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.6
본 논문에서는 반응표면분석법을 이용한 Arthrobacter sp. PAMC 25486의 carotenoids 생산 배지의 최적화를 수행하였다. Placket-Burman 방법을 이용하여 yeast extract, MgSO4, dextrose가 carotenoids의 생산에 영향을 미치는 주요인자인 것을 확인하였다. 반응표면분석 방법을 이용하여 최대 carotenoids 생산 농도를 갖는 yeast extract, MgSO4, dextrose의 농도를 계산한 결과 1 g/L yeast extract, 0.0879 g/L MgSO4 and 1 g/L dextrose의 농도에서 최대 307 mg/L 의 carotenoids 농도가 예측됐으며, 실제 배양 결과 288 mg/L carotenoids가 얻어졌다. 얻어진 농도 값은 최적화 이전의 값에 비하여 200% 이상 증가하였다. 이러한 결과로부터 미생물 배양에 의한 carotenoids 생산을 증가시키기 위한 배지최적화 방법으로서 반응표면분석법의 유용성을 확인할 수 있었다. This study was conducted to optimize the medium composition for carotenoid production in Arthrobacter sp. PAMC 25486 through response surface methodology (RSM). Using a Placket-Burman design, from which yeast extract, MgSO4 and dextrose were identified as the significant factors affecting carotenoids production. RSM studies for carotenoids production by Arthrobacter sp. PAMC 25486 have been carried out for three parameters of yeast extract, MgSO4 and dextrose concentrations. These significant factors were optimized by experiments and RSM, as 1 g/L yeast extract, 0.0879 g/L MgSO4 and 1 g/L dextrose. The experimentally obtained concentration of carotenoid was 288 mg/L, and it became 2-fold increase on concentration before optimization.
김현일(Hyun-il Kim),이상민(Sang Min Lee),신명선(Myung Sun Shin),이종호(Jong Ho Lee) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.12
현재 생활문화 수준의 향상과 소득 증대에 따라 환경오염에 대한 관심이 증가하고 있다. 또한, 수질오염에 대한 규제가 강화되어 수질오염 방지 및 하수처리 효율 향상을 위한 연구가 지속적으로 수행되고 있다. 하수처리 효율을 향상시키는 방법 중 하나는 수처리조 내에서 용존산소량을 늘려주는 것이다. 본 연구에서는 용존산소량을 늘려주고, 산소 발생기에서 발생되는 버블의 크기를 작게 만들 수 있는 설계 방안을 제시한다. 마이크로버블 발생노즐로 유입되는 물과 공기의 유동 형태에 따라 선회 및 충돌을 생성시켜 버블의 크기를 미세하게 만들었다. 본 해석결과에서 충돌 방식의 경우 버블의 크기는 목표치를 만족하지 못하였다. 반면 선회를 이용한 노즐에서는 0~ 50μm 사이의 버블이 79.3%를 차지하고 있는 것으로 나타났다. 본 연구를 통해 개발된 마이크로버블 발생노즐은 하수처리 효율을 증대시킬 수 있을 것이다. Recently, with increasing standards of living and income, environmental pollution has attracted increased interest. On account of a revision to water pollution regulations, the improvement of sewage disposal efficiency was studied. One of the ways to improve the sewage disposal efficiency is to increase the dissolved oxygen content of water in the water treatment tank. In this study, we suggest a nozzle design using a spiral and a crash mode for generating micro bubbles and thus increasing the dissolved oxygen content of water. The micro bubbles through the spiral and crash flows are generated in the nozzle. In the design of the crash mode, the development goal with regard to the bubble size was not achieved. On the other hand, a bubble size of 0?50 μm accounted for 79.3% of all bubbles in the spiral mode. This study should contribute toward increasing the sewage disposal efficiency.
순환식 반응기에서 $TiO_{2}$ 광촉매를 이용한 Chromium(VI)의 제거에 미치는 영향인자에 대한 연구
김현용,조일형,이소진,기원주,이홍근,Kim, Hyun-Yong,Cho, Il-Hyoung,Lee, So-Jin,Ki, Won-Ju,Lee, Hong-Keun 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.3
This study was carried out the removal of Cr(VI) which was known to the toxic pollutant in industry using the process of UV and TiO$_2$ photocatalyst in a circular type reactor. In this experiment, the series of photocatalytic process for the removal of Cr(VI) has been selected as a model reaction in a circular type reactor in order to obtain the basic data on the influence of various experimental parameters such as circulation flow rate, pH of solution, initial Cr(VI) light illumination and TiO$_2$ dosage, and salicylic acid concentration. The results of this study were as follows; 1. With both UV light illumination and TiO$_2$ present, Cr(VI) was more effectively eliminated than with either UV or TiO$_2$ alone. 2. As the circulation flow rate of solution increased, the removal efficiency of Cr(VI) was increased. However, over 2.4 l/min of circulation flow rate, the efficiency wa limited. 3. A increase in the photocatalytic removal of Cr(VI) was noticed with decreasing pH. 4. An increase in the photocatalytic removal of Cr(VI) was noticed with decreasing Initial Cr(VI) concentration and first order kinetics was observed from the result at different initial concentration of Cr(VI). 5. Photocatalytic removal efficiency of Cr(VI) increased with increasing TiO$_2$ dosage. However, over 1.0 g/l of TiO$_2$ dosage, the efficiency reached a plateau. 6. As low concentration of saliculic acid were added, there was an increase in the removal efficiency of Cr(VI). However, over 300 mg/l of salicylic acid, the efficiecy was decreased. It eas found that application of photocatalysis to water treatment that contains both Cr(VI) and salicylic acid was possible.
고분자 전해질 연료전지 유로의 수분배출 특성의 실험 및 해석적 평가
김현일(Hyun-il Kim),남진현(Jin Hyun Nam),신동훈(Donghoon Shin),정태용(Tae-Yong Chung),김영규(Young-Gyu Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.2
Polymer electrolyte membrane (PEM) fuel cells are a promising technology for short-term power generation required in residential and automobile applications. Proper management of water has been found to be essential for improving the performance and durability of PEM fuel cells. This study investigated the liquid water exhaust capabilities of various flow channels having different geometries and surface properties. Threepass serpentine flow fields were prepared by patterning channels of 1 mm or 2 ㎜ width onto hydrophilic Acrylic plates or hydrophobic Teflon plates, and the behaviors of liquid water in those flow channels were experimentally visualized. Computational fluid dynamics (CFD) simulations were also conducted to quantitatively assess the liquid water exhaust capabilities of flow channels for PEM fuel cells. Numerical results showed that hydrophobic flow channels have better liquid water exhaust capabilities than hydrophilic flow channels. Flow channels with curved corners showed less droplet stagnation than the channels with sharp corners. It was also found that a smaller width is desirable for hydrophobic flow channels while a larger width is desirable for hydrophilic ones. The above results were explained as being due to the different droplet morphologies in hydrophobic and hydrophilic channels.
金賢鎰(Hyun-Il Kim),林涓贊(Youn-Chan Yim),朴大熙(Dae-Hee Park),張洪淳(Hong-Soon Chang),白壽鉉(Soo-Hyun Baek) 대한전기학회 2008 전기학회논문지 Vol.57 No.3
We studied on the dependency of parameters which those were used to design a ballast of ICP light source. These parameters were derived from Barkhausen criterion equation about the oscillating condition of ballast. Comparing with a change of turns, we can suggest that a change of l is suitable to control a Ip of an ICP light source . According to the Z-l equation, we can find an optimum rating power of ICP light sources corresponding to l.
폐열회수 환기장치의 열교환 효율 개선을 위한 전산수치해석
김현일(Hyun-il Kim),김재성(Jaesung Kim),박철우(Chulwoo Park),박경서(Kyungseo Park) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.1
In this paper, we performed numerical analysis to improve the heat exchange efficiency of wasted heat recovery ventilator which has a delivery and a exhaustion fan. One of the most important design factors that affect the efficiency of heat exchange is uniform counter-flow between inbound and outbound air flows. We had simulated several types of porous plates which were installed at air intake area. With plate having 45 degrees of installation angle and 15 mm diameter holes which are uniformly arranged, we can generate a uniform air flows at the area of porous media where inbound and outbound air flows are cross over. In addition, we installed a duct to reduce vortex flows at the outlet and to discharge exhaust airs rapidly. By using the proposed numerical assessment, we expect the improvement of the heat exchange efficiency of ventilator.