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조경일,안현욱,이승준 한국농공학회 2023 한국농공학회논문집 Vol.65 No.5
As abnormal weather conditions escalate, water disasters such as droughts and floods occur more frequently. These natural disasters are fatal toagricultural reservoirs, where the operation techniques vary greatly depending on the season and weather conditions, and response through intake worksis limited. In response, governments like the Korea Rural Community Corporation have researched efficient water supply methods through irrigationchannels. Therefore, previous studies analyzed the irrigation process using numerical models to determine an efficient irrigation system. However,SWMM and EPANET used in previous studies are limited in quantitative agricultural irrigation process analysis. Therefore, this study developed AIRISSto simulate and analyze agricultural irrigation. Specifically, we simulated the irrigation process in the Ssangbong area of South Korea and simulatedthe irrigation process to verify the performance of the numerical model. AIRISS, developed in this study, is specialized in simulating the agriculturalirrigation process. It can check the supply to each paddy and the condition of each paddy.
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.
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.