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KOMPSAT-3·3A 위성영상 글로벌 융합활용을 위한 다중센서 위성영상과의 정밀영상정합
김태헌,윤예린,이창희,한유경,Kim, Taeheon,Yun, Yerin,Lee, Changhui,Han, Youkyung 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
Arriving in the new space age, securing technology for fusion application of KOMPSAT-3·3A and global satellite images is becoming more important. In general, multi-sensor satellite images have relative geometric errors due to various external factors at the time of acquisition, degrading the quality of the satellite image outputs. Therefore, we propose a fine-image registration methodology to minimize the relative geometric error between KOMPSAT-3·3A and global satellite images. After selecting the overlapping area between the KOMPSAT-3·3A and foreign satellite images, the spatial resolution between the two images is unified. Subsequently, tie-points are extracted using a hybrid matching method in which feature- and area-based matching methods are combined. Then, fine-image registration is performed through iterative registration based on pyramid images. To evaluate the performance and accuracy of the proposed method, we used KOMPSAT-3·3A, Sentinel-2A, and PlanetScope satellite images acquired over Daejeon city, South Korea. As a result, the average RMSE of the accuracy of the proposed method was derived as 1.2 and 3.59 pixels in Sentinel-2A and PlanetScope images, respectively. Consequently, it is considered that fine-image registration between multi-sensor satellite images can be effectively performed using the proposed method.
타이타늄 스크랩 활용 Ti<sub>3</sub>AlC<sub>2</sub> MAX 상분율 향상을 위한 합성 조건 최적화
김태헌,임재원,Taeheon Kim,Jae-Won Lim 한국자원리싸이클링학회 2024 資源 리싸이클링 Vol.33 No.1
To synthesize the Ti<sub>3</sub>AlC<sub>2</sub> MAX phase, a crucial precursor for generating the two-dimensional material MXene, the use of Ti scrap as an initial material is an economically feasible approach. This study aims to optimize the synthesis conditions for the phase fraction of the Ti<sub>3</sub>AlC<sub>2</sub> MAX phase utilizing Ti scrap as the Ti source. The deoxidation of Ti powders, prepared through the hydrogenation-dehydrogenation process from Ti scrap, was effectively accomplished using the deoxidation in solid-state (DOSS) process. The optimal synthesis conditions were established by blending DOSS-Ti, Al, and graphite powders with particle sizes ranging from 25 ~ 32 ㎛ in a molar ratio of 3:1.1:2. The resulting phase fractions were as follows: Ti<sub>3</sub>AlC<sub>2</sub> at 97.25 wt.%, TiC at 0.93 wt.%, and Al<sub>3</sub>Ti at 1.82 wt.%. Furthermore, the oxygen content of the Ti<sub>3</sub>AlC<sub>2</sub> MAX powder, spanning from 25 ~ 45 ㎛, was measured at 4,210 ppm.
무인항공기로 취득된 영상 기반 시계열 수치표고모델의 표고 보정
김태헌(Kim, Taeheon),이원희(Lee, Won Hee),한유경(Han, Youkyung) 한국측량학회 2020 한국측량학회 학술대회자료집 Vol.2020 No.7
본 연구에서는 무인항공기 영상 기반의 시계열 수치표고모델의 표고를 보정하기 위한 수치표고 모델 표고 보정 방법론을 제시한다. 제안기법은 영상 간 표고 불변특성을 보이는 비식생지역의 표고를 표고 보정을 위한 데이터인 EIFs (Elevation Invariant Features)로 추출한다. 그리고 EIFs를 기반으로 선형회귀식을 구성하여 수치표고모델의 표고를 보정함으로써 지상기준점 데이터 없이 고품질의 수치표고모델을 제작한다. 총 10장의 수치표고모델을 활용하여 제안기법의 정확도를 분석하였으며, 그 결과 시계열 수치표고모델의 표고가 효과적으로 보정된 것을 확인하였다.