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그래뉼 타입 활성탄 필터의 100 나노 미만 다분산 초미세먼지 표면흡착 제거 효율 연구
조경일,강기원,신지윤,김창혁 한국입자에어로졸학회 2022 Particle and Aerosol Research Vol.18 No.3
Many commercial air purifiers currently have deployed granular activated carbon (GAC) filters for removing volatile organic compounds in the indoor air. GACs are generally used to remove gaseous contaminants in the air through adsorption by the inner surfaces of pores. In addition, airborne particles can be also filtered by the surface adsorption of the GACs, which can improve the life-time of the particulate filters. In this study, the filtration efficiency of GACs to ultrafine particles through surface adsorption was investigated at different volume flow rates by deploying a continuous particle filtration system. The polydisperse sodium chloride (NaCl) particles were generated by a set of an atomizer and a diffusion dryer, and then mixed with particle-free air at different volume flow rates. The penetration of ultrafine particles and pressure drop for each experimental condition were measured to figure out the effect of the volume flow rate on the surface adsoprtion of the GACs to particles, ~ 2 mm. The particle filtration efficiency of the GACs decreased as the volume flow rate increased from 4 to 14 lpm. However, the 5 times thicker GAC filter layer decreased the penetration of ultraparticles than a preious study. The filtration efficiency of the single granule was also higher than the previous result in the literature with smaller granule filter materials.
조경일,신정원 대한진단검사의학회 2013 Annals of Laboratory Medicine Vol.33 No.2
Background: The Soonchunhyang University Hospital Bloodless Center was established in 2000, and more than 2,000 bloodless surgeries have been performed there since. In this study, the lowest postoperative Hb/preoperative Hb (Hblow/pre) ratio and mortality rates of patients who underwent bloodless surgery were analyzed for each maximum surgical blood order schedule (MSBOS) category to assess whether MSBOS can be used as a predictor of successful completion of bloodless surgery. Methods: A total of 971 patients were included. MSBOS was defined as the average number of units of RBCs transfused during each elective surgery. We used the Hblow/pre ratio as an alternative to intraoperative blood loss. Frequency of Hblow/pre ratios ≤0.5, use of transfusion alternatives, and mortality rates were compared across MSBOS categories. Results: Out of the 971 patients, 701 (72.2%) were categorized as type and screen (T&S),184 (18.9%) as MSBOS 1, 64 (6.6%) as MSBOS 2, and 22 (2.3%) as MSBOS 4. Transfusion alternatives were used by 397 (40.9%) patients. The frequency of the use of simultaneous erythropoietin and iron, hemostatics, acute normovolemic hemodilution, and Cell Saver (Haemonetics corp., USA) was higher in patients in the higher MSBOS categories. Six (0.6%) patients died within 30 days of surgery. Hblow/pre ratios tended to be lower as the level of MSBOS category increased. Conclusions: Surgeries in the higher MSBOS categories tended to be associated with high blood loss and mortality. Active use of transfusion alternatives is recommended in patients in high MSBOS categories who are scheduled to undergo bloodless surgery.
만성 주정 중독 쥐에서 총담관 결찰이 간의 Aryl Sulfotransferase Ⅲ,Ⅳ 의 활성에 미치는 영향
조경일,김여희,곽춘식 계명대학교 의과학연구소 2001 계명의대학술지 Vol.20 No.1
The drinking hazard in hepatobiliary disease was studied by the assays of hepatic aryl sulfotransferase Ⅲ, Ⅳ isozyme activies in cholestasis induced by common bile duct (CBD) ligation after chronic ethanol intoxication in rats. The activity of serum aryl sulfotransferase Ⅲ, Ⅳ isozyme was also measured. Liver cytosolic aryl sulfotransferase Ⅲ, Ⅳ isozyme activity in the group of CBD ligation after chronic ethanol intoxication showed a greater decrease between the 7th and the 14th day after CBD ligation than that in the group of CBD ligation alone. The mitochondrial aryl sulfotransferase Ⅲ, Ⅳ isozyme activity in the group of CBD ligation after chronic ethanol intoxication showed a greater decrease at the 14th day after CBD ligation than that in the group of CBD ligation alone. The microsomal arylsulfotransferase Ⅲ, Ⅳ isozyme activity in the CBD ligation after chronic ethanol intoxication showed a greater decrease between the 2nd and 14th day after CBD ligation than that in the group of CBD ligation alone, The serum aryl sulfotrnasferase Ⅲ, Ⅳ isozyme activity in the CBD ligation after chronic ethanol intoxication showed a greater increase between the 1st and 14th day after CBD ligation than that in the group of CBD ligation alone. The Vmax values of the liver cytosolic and mitochondrial aryl sulfotransferase Ⅲ, Ⅳ isozyme in the CBD ligation after chronic ethanol intoxication showed a greater decrease at the 14th day after CBD ligation than that in the group of CBD ligation alone. However, the Km values of the above hepatic enzymes did not change. The results indicate that the biosynthesis of the liver aryl sulfotransferase Ⅲ, Ⅳ isozyme is decreasing in chronic ethanol Intoxication with cholestasis than in cholestasis alone. The increased activity of the serum aryl sulfotransferase Ⅲ, Ⅳ isozyme in chronic ethanol intoxication with cholestasis reflects increased hepatic damages which cause this isozyme to leak into the blood in great quantity.
만성 주정 중독 쥐에서 총담관 결찰이 간의 Aryl Sulfotransferase I,II Isozyme의 활성에 미치는 영향
조경일,곽춘식 계명대학교 의과학연구소 2000 계명의대학술지 Vol.19 No.1
The drinking hazard in hepatobiliary disease was studied by the assays of liver cytosolic, mitochondrial, and microsomal aryl sulfotransferase Ⅰ, Ⅱ isozyme, in cholestasis induced by common bile duct (CBD) ligation after chronic ehtanol intoxication with rats. The activity of serum aryl sulfotransferase Ⅰ, Ⅱ isozyme was also measured. Liver mitochondrial aryl sulfotransferase Ⅰ, Ⅱ isozyme activity in group of CBD ligation after chronic ethanol intoxication showed a greater decrease between the 3rd and the 14th day after CBD ligation than that in group of CBD ligation alone. However, the cytosolic Ⅰ, Ⅱ isozyme activity did not change. The nicrosomal aryl sulfotransferase Ⅰ, Ⅱ isozyme activity in the CBD ligation after chronic ehanol intoxication showed a greater decrease between the 7th and the 14th day after CBD ligation than that in the CBD ligation alone. The serum aryl sulfotransferase Ⅰ, Ⅱ isozyme activity in the CBD ligation after chronic ethanol intoxication showed a greater increase between the 2nd and the 14th day after CBD ligation than that in the CBD ligation alone. The Vmax values of the liver mitochondrial and microsomal aryl sulfotransferase Ⅰ, Ⅱ isozymes in the CBD ligation after chronic ethanol intoxication showed a greater decrease at the 14th day after CBD ligation than that in the CBD ligation alone. However, the Km values of the above hepatic enzymes did not change. The results indicate that the biosynthesis of the hepatic aryl sulfotransferase Ⅰ, Ⅱ isozyme is decreasing in chronic ethanol intoxiaction with cholestasis than is cholestasis alone. The increased activity of the serum aryl sulfotransferase Ⅰ, Ⅱ isozyme is chronic ethanol intoxication with cholestasis than in cholestasis alone reflect that increased hepatic damages which cause this isozyme to leak into the blood in great quantity.
제조법에 따른 MgO 나노입자의 이산화탄소 흡착 특성 예비 연구
조경일,채석병,김창혁 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
기후변화의 심각성이 대두되면서 탄소중립을 위해 대표적 온실가스인 이산화탄소(CO₂)의 배출을 줄일 수 있는 탄소포집 및 전환기술(Carbon Capture, Utilization and Storage (CCUS))에 대한 관심이 높고 많은 연구가 이루어지고 있다. 특히, MgO는 CaO와 함께 Mineral Carbonation에 의한 화학적 흡착으로 CO₂를 제거할 수 있는 물질로 잘 알려져 있다. 게다가, MgO를 나노입자로 만들어 표면적을 넓히면 CO₂ 흡착성능이 향상됨이 잘 알려져 있다. 본 연구에서는 MgO 나노입자를 두 가지 에어로졸 공법(Self Combustion (SC), Flame Metal Combustion (FMC))으로 제조한 뒤, 상용 MgO 나노파우더와 함께 시간에 따른 CO₂ 흡착 특성의 차이를 비교, 분석하였다. 흡착 과정에서 나타나는 형상, 크기, 화학적 조성의 변화를 SEM, TEM, XRD, FT-IR를 이용하여 분석하였다. SC법으로 제조한 MgO 나노입자는 일반적으로 정육면체 형상을 나타내지만, FMC법으로 제조한 MgO 나노입자는 모서리가 Terrace 진 입자도 만들어짐을 확인하였다. XRD 분석결과를 사용하여 SC, FMC법으로 제조한 MgO 나노입자와 상용 MgO의 다른 결정성을 확인할 수 있었다. 증류수에 혼합하여 슬러리 상태 만들었을 때 제조법에 Mg(OH)2로 전환되는 정도가 다르게 나타났으며, CO₂를 흡착하는 과정에서 탄산염(MgCO₃)으로 전환되는 속도에서도 차이를 보였다. TGA-DSC를 이용하여 CO₂ 흡착량에 대한 정량적 비교 시에도 제조법에 따른 경향성의 차이를 나타내었다.