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지상 초분광자료를 이용한 근소만 갯벌표층에서 저서성 미세조류의 엽록소-a 공간분포 추정
고수윤 ( Sooyoon Koh ),노재훈 ( Jaehoon Noh ),백승일 ( Seungil Baek ),이호원 ( Howon Lee ),원종석 ( Jongseok Won ),김원국 ( Wonkook Kim ) 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.5
갯벌 표면에는 저서성 미세조류의 생체량이 높고, 그에 따라 높은 일차생산을 나타낸다. 갯벌의 탄소순환 및 유기탄소 부존량을 추산하기 위한 일차생산력 측정 연구가 기존에 진행되어 왔지만, 최근에는 광학 원격탐사, 특히 초분광센서를 이용하는 연구는 비교적 최근에 시도되기 시작하였다. 본 연구에서는 지상에서 관측된 초분광자료를 통하여 생산성 추정의 기초자료가 되는 갯벌 표면의 엽록소 농도를 추정하는 연구를 수행하였다. 연구 대상지는 충청남도 태안군에 위치한 근소만이며, 현장조사는 2021년 4월과 6월 간조시에 수행하였다. 갯벌 표면의 초분광반사도를 얻기 위하여 지향형 센서인 TriOS RAMSES와 카메라 형태의 Specim-IQ, 두 종류의 초분광센서를 사용하였고, 광학관측자료를 통해 갯벌 표면의 엽록소-a 농도를 추정하기 위해 정규 식생지수(NDVI)와 Continuum Removal Depth(CRD)기법을 사용하였다. 현장조사시 시료분석을 통해 측정한 엽록소-a 농도와의 비교 결과, 두 기법 모두 엽록소-a 농도 약 0~150 mg/㎡의 범위에 대해 추정 결정계수 약 0.7을 달성할 수 있는 것으로 나타났다. Mudflats are crucial for understanding the ecological structure and biological function of coastal ecosystem because of its high primary production by microalgae. There have been many studies on measuring primary productivity of tidal flats for the estimation of organic carbon abundance, but it is relatively recent that optical remote sensing technique, particularly hyperspectral sensing, was used for it. This study investigates hyperspectral sensing of chlorophyll concentration on a tidal flat surface, which is a key variable in deriving primary productivity. The study site is a mudflat in Geunso bay, South Korea and field campaigns were conducted at ebb tide in April and June 2021. Hyperspectral reflectance of the mudflat surfaces was measured with two types of hyperspectral sensors; TriOS RAMSES (directional sensor) and the Specim-IQ (camera sensor), and Normal Differenced Vegetation Index (NDVI) and Contiuum Removal Depth (CRD) were used to estimate Chl-a from the optical measurements. The validation performed against independent field measurements of Chl-a showed that both CRD and NDVI can retrieve surface Chl-a with R2 around 0.7 for the Chl-a range of 0~150 mg/㎡ tested in this study.
김은서,도윤정,원종욱,노재훈 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.4
Objective : Injury to the airway, found in 25 % to 35 % of patients admitted to major burn center, is now the leading cause of death in burn patients. Significant inhalation injury can increase the patient mortality rates by up to 20 %. Toxic compounds in smoke can include phosgene, ammonia, sulfur dioxide, and chlorine from plastics and various oxides and aldehydes from burning wood. These compound directly injure airway epithelial cells, causing an intense inflammatory response with significant edema. After the critical problem is controlled with intensive care in inhalation burn patients, less critical but significant laryngeal function such as protection, phonation and deglutition may often be overlooked. Method & Result : We have experienced a male patient who was injured by inhalation of toxic compound in ship under construction. He have suffered from pulmonary problem, bronchiolitis obliterans. Voice disorder was assessed and managed by otolaryngologists after resolving the pulmonary lesion. Conclusion : Evaluation and treatment of patients suspected of inhalation injury should include anatomical and functional aspects of the larynx as well as critical problem of the airway.