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GMAP & SIJAQ 2020 캠페인 기간 동안 Pandora를 이용한 이산화질소 수직층적분 농도 산출 및 GEMS 산출물과의 비교
이한림,김대원,김세린,홍현기,장임석,정욱교,김덕래,김동희,김준,김상우,송창근,박상서,백강현 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
본 연구에서는 처음으로 GMAP (GEMS Map of the Air pollution & SIJAQ (Satellite Integrated Joint monitoring of Air Quality) 2020 겨울 캠페인 기간동안 태양직달광 초분광 원격측정장비 Pandora로 관측된 원시자료로부터 이산화질소 수직층적분농도를 산출하였고, 세계최초 정지궤도 환경위성에 탑재된 UV-VIS 센서인 GEMS (Geostationary Environment Monitoring Spectrometer)의 산출물인 이산화질소와 비교를 수행하였다. 이산화질소 수직층적분농도는 4개의 서산 측정소 위치한 4대의 Pandora 장비로 차등흡수분광기술을 사용하여 산출되었다. Inter-comparison 기간 동안 4대의 Pandora 장비로 산출된 이산화질소 수직층적분농도의 상관관계는 0.99로 나타났다. 또한, 기울기와 y 절편은 각각 0.90에서 0.99, -5.15×10<SUP>14</SUP>에서 5.58×10<SUP>14</SUP>이다. Pandora와 GEMS, TROPOMI (TROPOspheric Monitoring Instrument), OMPS (Ozone Mapping and Profiler Suite)로 산출된 이산화질소 수직층적분 농도의 일변화가 잘 일치하는 것을 보여준다. Pandora로 산출된 이산화질소 수직층적분농도와 GEMS로 산출된 이산화질소 수직층적분농도의 상관관계는 0.60에서 0.75로 나타났다. 또한, Pandora 장비의 수평적 대표성을 고려하여 비교를 수행하였으며 수평적 대표성을 고려한 경우와 고려하지 않은 경우에 대해 각각 GEMS 산출물과 비교하였다.
미세색전신호를 동반한 Percheron동맥 관련 양측성 시상경색증
이한림,김예린,신병수,강현구 대한신경과학회 2023 대한신경과학회지 Vol.41 No.1
The artery of Percheron (AOP) is an uncommon variant of the posterior cerebral artery that supplies blood to the paramedian thalamus and rostral midbrain. AOP is often difficult to recognize with intracranial magnetic resonance angiography due to its small size. Although a number of case reports of AOP occlusion have been published, cause of the occlusion is mostly unclear. We experienced a case of AOP occlusion which resulted in bilateral thalamic infarction. It was most likely caused by a microembolism through right-left shunt.
이한림,노영민,권순철,홍현기,한경수 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
Imaging Differential Optical Absorption Spectroscopy (Imaging-DOAS) has been utilized in recent years to provide slant column density (SCD) distributions of several trace gas species in the plume. The present study introduces a new method using Imaging-DOAS data to determine two-dimensional plume structure from the plume emissions of power plant in conditions of negligible aerosol effects on radiative transfer within the plume. We demonstrates for the first time that two-dimensional distributions of sulfur dioxide (SO2) and nitrogen dioxide (NO2) in power plant emissions can be determined simultaneously in terms of SCD distribution. The SO2 SCD values generally decreased with increasing distance from the stack and with distance from the center of the plume. Meanwhile, high NO2 SCD was observed at locations several hundred meters away from the first stack due to the ratio change of NO to NO2 in NOx concentration, attributed to the NO oxidation by O3. The results of this study show the capability of the Imaging-DOAS technique as a tool to estimate plume dimensions in power plant emissions.
Improvement in Plume Dispersion Formulas for Stack Emissions Using Ground-based Imaging-DOAS Data
이한림,류재영,정욱교,노영민,신성균,홍현기,권순철 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.12
This study introduces a new method of combining Imaging Differential Optical Absorption Spectroscopy (Imaging-DOAS) data and plume dispersion formulas for power plant emissions to determine the threedimensional structure of a dispersing pollution plume and the spatial distributions of trace gas volume mixing ratios (VMRs) under conditions of negligible water droplet and aerosol effects on radiative transfer within the plume. This novel remote-sensing method, applied to a power plant stack plume, was used to calculate the twodimensional distributions of sulfur dioxide (SO2) and nitrogen dioxide (NO2) VMRs in stack emissions for the first time. High SO2 VMRs were observed only near the emission source, whereas high NO2 VMRs were observed at locations several hundreds of meters away from the initial emission. The results of this study demonstrate the capability of this new method as a tool for estimating plume dimensions and trace gas VMRs in power plant emissions.