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KOMPSAT-3/3A 영상 기반 하천의 탁도 산출 연구
김다희,원유준,한상명,한향선,Kim, Dahui,Won, You Jun,Han, Sangmyung,Han, Hyangsun 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
Turbidity, the measure of the cloudiness of water, is used as an important index for water quality management. The turbidity can vary greatly in small river systems, which affects water quality in national rivers. Therefore, the generation of high-resolution spatial information on turbidity is very important. In this study, a turbidity retrieval model using the Korea Multi-Purpose Satellite-3 and -3A (KOMPSAT-3/3A) images was developed for high-resolution turbidity mapping of Han River system based on eXtreme Gradient Boosting (XGBoost) algorithm. To this end, the top of atmosphere (TOA) spectral reflectance was calculated from a total of 24 KOMPSAT-3/3A images and 150 Landsat-8 images. The Landsat-8 TOA spectral reflectance was cross-calibrated to the KOMPSAT-3/3A bands. The turbidity measured by the National Water Quality Monitoring Network was used as a reference dataset, and as input variables, the TOA spectral reflectance at the locations of in situ turbidity measurement, the spectral indices (the normalized difference vegetation index, normalized difference water index, and normalized difference turbidity index), and the Moderate Resolution Imaging Spectroradiometer (MODIS)-derived atmospheric products(the atmospheric optical thickness, water vapor, and ozone) were used. Furthermore, by analyzing the KOMPSAT-3/3A TOA spectral reflectance of different turbidities, a new spectral index, new normalized difference turbidity index (nNDTI), was proposed, and it was added as an input variable to the turbidity retrieval model. The XGBoost model showed excellent performance for the retrieval of turbidity with a root mean square error (RMSE) of 2.70 NTU and a normalized RMSE (NRMSE) of 14.70% compared to in situ turbidity, in which the nNDTI proposed in this study was used as the most important variable. The developed turbidity retrieval model was applied to the KOMPSAT-3/3A images to map high-resolution river turbidity, and it was possible to analyze the spatiotemporal variations of turbidity. Through this study, we could confirm that the KOMPSAT-3/3A images are very useful for retrieving high-resolution and accurate spatial information on the river turbidity.
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김창현(Changhyun Kim),한상명(Sangmyung Han) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The duration of vehicle aging mode for the certification is required to be shorter in order to reduce the vehicle development time. And the durability prediction of emission control components, especially O₂ sensor and catalytic converter is getting more important as emission regulation is stricter and vehicle durability mileage are extended<br/> Real road condition and driving pattern must be reflected into development stage to meet regulation at high mileage. In order to get the frequent driving pattern of vehicle, a vehicle had been tested by changing drivers and driving roads. Real road driving patterns around Seoul were analyzed and compared to those of certification mode<br/>
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[가솔린엔진부문] 미국 가솔린 차량의 배출가스 인증레벨 및 열화특성 연구
배기경(KiKyoung Bae),한상명(Sangmyung Han) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The emission certification trend of the model year 1999 & 2000 vehicles has been investigated with the certification database of EP A. This paper contained the average emission level, and the emission level & DF(the Deterioration Factor) of every car-maker. Especially this study tried to compare the average certification emission levels of whole vehicles with those of representative car-makers such as Honda, Ford, etc.<br/> This study was accomplished on the basis of the data of only Gasoline LDV(Light Duty Vehicle) and LDTI(Light Duty Truck I : Loaded Vehicle Weight:$; 3,7501bs) from the database of EPA certification exhaust emission tests.<br/> <br/>
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DPF 입구형상 변화에 따른 정상상태시 유동특성에 대한 해석
박승주(Seoungzoo Park),김돈수(Donsoo Kim),한상명(Sangmyung Han) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There're a lot of computational predictions in the diesel exhaust system carried out for the improvement of the flow distributions and pressure drop. Especially, in order to cope with the severe emission like EU-5 in the future. it is necessary to improve flow pattern of the new type of DPF which was installed at the end of the turbocharger directly. This study is concerned with the introduction of the swirl-type inlet parts and the investigation of swirl effect on flow pattern of the catalyst and filter under the steady state using Star-CD.
ScienceON
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