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MODIS 영상자료를 이용한 관개시기 탐지와 논 피복지도 제작
정승택 ( Seung Taek Jeong ),장근창 ( Keun Chang Jang ),홍석영 ( Seok Yeong Hong ),강신규 ( Sin Kyu Kang ) 한국농림기상학회 2011 한국농림기상학회지 Vol.13 No.2
Rice is one of the world`s staple foods. Paddy rice fields have unique biophysical characteristics that the rice is grown on flooded soils unlike other crops. Information on the spatial distribution of paddy fields and the timing of irrigation are of importance to determine hydrological balance and efficiency of water resource management. In this paper, we detected the timing of irrigation and spatial distribution of paddy fields using the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor onboard the NASA EOS Aqua satellite. The timing of irrigation was detected by the combined use of MODIS-based vegetation index and Land Surface Water Index (LSWI). The detected timing of irrigation showed good agreement with field observations from two flux sites in Korea and Japan. Based on the irrigation detection, a land cover map of paddy fields was generated with subsidiary information on seasonal patterns of MODIS enhanced vegetation index (EVI). When the MODISbased paddy field map was compared with a land cover map from the Ministry of Environment, Korea, it overestimated the regions with large paddies but underestimated those with small and fragmented paddies. Potential reasons for such spatial discrepancies may be attributed to coarse pixel resolution (500 m) of MODIS images, uncertainty in parameterization of threshold values for discarding forest and water pixels, and the application of LSWI threshold value developed for paddy fields in China. Nevertheless, this study showed that an improved utilization of seasonal patterns of MODIS vegetation and water-related indices could be applied in water resource management and enhanced estimation of evapotranspiration from paddy fields.
소진섭(Jin-Sub So),정형일(Hyeong Il Jeong),김주원(Ju-Won, Kim),김대식(Dae-Sik Kim),김진우(Jin-Woo Kim),이성준(Seoung-Jun Lee),정승택(Seung-Taek Jung),김용한(Yong-Han Kim),이강우(Gang-Woo, Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
객화차용 폐제륜자에 대해 분쇄 특성을 평가하였다. 모두 1mm이하의 크기로 분말화가 가능하였다. 또한 상온시료보다 500℃, 900℃ 열처리 시료의 경우 파쇄 및 분쇄가 더 쉽게 이루어졌으며, 물리적 성질이나 성분 변화는 없다. 단지 마찰재의 마모만 발생하고, 원료 물질의 조성이나 특성은 변화가 없는 것으로 판단된다. Discarded brake shoes’ grinding characteristics for passenger and freight car were evaluated. It was possible to triturate the shoes into the size of less than 1mm. And the thermal treatment samples at 500℃ and 900℃ were more easily crushed and grinded than the samples at room temperature. There was no physical properties and composition changes of the shoes. We finally determined that the properties and composition of the basic raw materials weren’t changed except for abrasion of friction materials.