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이상화,이호인 ( Sang Hwa Lee,Ho In Lee ) 한국공업화학회 1993 공업화학 Vol.4 No.3
담지된 백금촉매에 주석의 첨가는 포화탄화수소의 탈수소고리화 반응에 대한 촉매의 활성 및 안정도의 현저한 증가를 가져왔다. n-octane의 탈수소고리화 반응에서 0.75wt%의 Pt에 대해 주석의 몰비가 약 4일 때 가장 높은 촉매적 활성을 나타냈다. 또한 K의 첨가도 n-hexane의 탈수소고리화 반응에 대해 주석과 비슷한 효과를 나타내었다. n-octane의 전환반응의 경우에는, K의 첨가 효과가 적게 나타났다. The addition of Sn to Pt/γ-Al_2O_3 catalyst greatly enhanced the activity and decreased the deactivation rate for the dehydrocyclization of paraffins. For the dehydrocyclization of n-octane, there appeared to be an optimal ratio of Pt:Sn= 1 :4 for 0.75 wt% Pt/γ-Al_2O_3 catalyst. The addition of K to Pt/γ-Al_2O_3 also produced a similar effect on the dehydrocyclization of n-hexane. In the case of n-octane, the addition of K led to a less selective catalyst.
단일 균열암반에서 핵종/콜로이드 복합이동에 대한 수치모델 개발
이상화,김정우,정종태,Lee, Sanghwa,Kim, Jung-Woo,Jeong, Jongtae 한국방사성폐기물학회 2012 방사성폐기물학회지 Vol.10 No.4
본 연구에서는 콜로이드와 핵종의 복합이동에 관한 수치모델을 개발하였다. 콜로이드와 핵종의 반응-이동 지배방정식을 풀기 위하여 Operator Splitting Method 중 Strang의 분리 SNI 방식을 수치해석 방법으로 채택하였고 이는 MATLAB을 이용하여 코드화 되었다. 개발된 수치모델은 용질의 이동 및 분산만을 고려한 해석해를 통한 검증과정에서 피어슨 상관계수의 제곱값($r^2$)이 0.99 이상으로 나타나 모델의 정확성이 입증되었다. In this study, numerical model for transport of radionuclide and colloid was developed. In order to solve reaction-migration governing equation for colloid and radionuclide, Strang-splitting Sequential Non-Iterative (SNI), which is one of Operator Splitting Method, was used for numerical method and this was coded by MATLAB. From the verification by comparing the simulation results with analytical solution considering only solute transport and rock diffusion, the Pearson's correlation coefficient was greater than 0.99 which demonstrates the accuracy of the model.
이상화,유광민,최장영,장석명 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.4
The comparison results for the resistance and voltage-dividing ratios of a direct current (DC) high-voltage divider at the low-voltage level were presented. The two ratios were equal within 0.3 × 10 −6 for the 2250:1 ratio and within 0.5 × 10 −6 for the 15,000:1, 13,500:1, 6750:1, and 675:1 ratios. The results show that the divider can be used as a reference voltagedividing ratio device within a 0.5 × 10 −6 agreement with sub-ppm uncertainty at low voltage, irrespective of which of the two ratios is selected. It was also confi rmed that the two ratios were traceable to quantum Hall resistance and Josephson voltage standards with a 0.4 × 10 −6 ( k = 1) uncertainty level up to 1 kV.
이상화,탁은영,조유정,Jiye Kim,이주영,이륜진,이관희,권민성,윤영인,이성규,남궁정만,김준기 한국바이오칩학회 2022 BioChip Journal Vol.16 No.1
During living donor liver transplantation, a number of blood vessels and bile ducts are anastomosed while the liver and gallbladder are resected in the donor and recipient. Early detection and treatment of complications after surgery by evaluating the function of blood vessels and the biliary tract is crucial. A biosensing chip that can monitor patient health status from the bile excreted during the recovery process has been developed using a surface-enhanced Raman sensing chip. Surface-enhanced Raman spectroscopy signals of bile obtained from normal bile duct ligation and gallbladder damage mouse models using a cautery device were identified and analyzed. The surface-enhanced Raman chip with a nanometer-level porous structure can selectively separate the nanometer biomarkers and measure the Raman signal. Through the detection of nanometer biomarkers in the bile and comparative analysis of histopathology, the Raman signal in the damaged gallbladder was compared with that caused by liver damage due to bile duct ligation, showing that it becomes a biosensing chip for monitoring recovery.
수술실내의 Halothane 오염방지에 대한 중앙집중식 흡인배기장치의 효과
이상화,예민해,이선행,조성경,김봉일,윤만모 대한마취과학회 1985 Korean Journal of Anesthesiology Vol.18 No.3
A central vacuum scavenger modified by the authors, was used to control the atmospheric contamination of the operating room by anesthetic gases and vapours. Air pollution was monitored by measuring the concentrations of balothane vapour in the air of the operating room with the gas chromatograph. Under endotrachal intubation, the semi-closed circle absorber system was used for anesthetic admistration and maintained with 0.8∼1.2% Halothane. Total gas flow rates were 4 liter/min with 50% oxygen in nitrous oxide for daily work. Air sampling was taken early in the morning at 10㎝ high from the floor before anesthesia. After daily work, they were also done at 10㎝, 120㎝, and 140㎝ high from the floor and at the corrkdor of the operating room. We investigated the differences of halothane concentration according to each site by the changing central vacuum pressure. Results are as followings: The atmospheric halothane concentrations of the operating room before anesthesia were 0.27±0.12, 0.22±0.11 and 0.15±0.06 ppm. The atmospheric halothane concentrations of the operating room after daily work were 7.94±1.30 ppm without the active central vacuum pressure. The atmospheric halothane concentrations of the operating room after daily work were 1.41±0.48 ppm of 20 mmHg of central vacuum pressure. The atmospheric halothane concentrations of the operating room after daily work were 0.49±0.18 ppm of 40 mmHg of central vacuum pressure. The atmospheric halothane concentrations at the corridor of the operating room after daily work were 1.09±0.19, 0.77±0.11, and 0.36±0.17 ppm when ench bacuum pressure was 0 mmHg, 20 mmHg and 40 mmHg. A significant reduction (P<0.01) in atmospheric halothane concentration of the operating room was obtained by the use of the central vacuum pressure with the scavenger. The higher the vacuum pressure, the greater reduction of the operating room air pollution was observed.