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적외선 화상처리 장치를 이용한 건조초기 목재 표면 온도 측정
이관영,강호양,이민경,Lee, Kwan-Young,Kang, Ho-Yang,Lee, Min-Kyung 한국가구학회 2006 한국가구학회지 Vol.17 No.3
Temperature of board surface was monitored during drying using an IR image measurement system. Boards were water-saturated and dried at the levels of four temperatures and three air velocities. At higher DB the surface temperature increased more steeply and level off period was significantly short. At the DB temperatures of 70, 80, $90^{\circ}C$ the period where the surface temperature was equivalent to WB temperature was constant regardless of air velocity while at $60^{\circ}C$ it decreased as air velocity increased. It was confirmed that a surface transfer coefficient increased with DB temperature. Variation of temperature profile on a wood surface increased with DB temperature and air velocity.
KOMPSAT-2 전정색영상과 다중분광영상의 융합기법 비교평가
오관영 ( Kwan Young Oh ),정형섭 ( Hyung Sup Jung ),이광재 ( Kwang Jae Lee ) 대한원격탐사학회 2012 大韓遠隔探査學會誌 Vol.28 No.1
본 연구의 목적은 KOMPSAT-2 위성영상에 가장 일반적으로 적용 가능한 영상융합기법을 제시하는 것이다. 가장 널리 사용되는 영상융합기법인 HPF, modified IHS, pan-sharpened, wavelet을 지역적, 계절적 특성이 서로 다른 4장의 KOMPSAT-2 위성영상에 적용하였고, 각각의 융합결과를 공간적, 분광적으로 비교분석 하였다. 영상융합기법의 품질평가는 시각적 분석과 정량적 분석을 병행하여 수행하였으며, 정량적 분석에는 spatial ERGAS, spectral ERGAS, SAM, Q4가 사용되었다. 종합적인 분석결과를 고려할 때, pan-sharpened가 색상정보와 공간정보의 균형적인 보존 측면에서 다른 융합기법들에 비해, 상대적으로 우수한 결과를 나타냈다. modified-IHS의 경우, 공간정보는 잘 보존하였지만 다소 큰 색상 왜곡이 발생되었고, HPF와 wavelet은 색상 왜곡은 적었지만, 공간정보의 왜곡이 발생하였다. The objective of this study is to propose efficient data fusion techniques feasible to the KOMPSAT-2 satellite images. The most widely used image fusion techniques, which are the high-pass filter (HPF), the intensity-hue-saturation-based (modified IHS), the pan-sharpened, and the wavelet-based methods, was applied to four KOMPSAT - 2 satellite images having different regional and seasonal characteristics. Each fusion result was compared and analyzed in spatial and spectral features, respectively. Quality evaluation of image fusion techniques was performed in both quantitative and visual analysis. The quantitative analysis methods used for this study were the relative global dimensional error (spatial and spectral ERGAS), the spectral angle mapper index (SAM), and the image quality index (Q4). The results of quantitative and visual analysis indicate that the pan-sharpened method among the fusion methods used for this study relatively has the suitable balance between spectral and spatial information. In the case of the modified IHS method, the spatial information is well preserved, while the spectral information is distorted. And also the HPF and wavelet methods do not preserve the spectral information but the spatial information.
오존을 이용한 유기물 및 세균의 제거 특성에 관한 연구
이관영 ( Kwan-young Lee ),박상현 ( Sang-hyun Park ) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.1
The aim of this study is to measure the removal characteristics of organic matter and bacteria with the use of ozone to reduce the problems caused by bacteria and organic matter which appear in sea-water is summer season. When the total input of ozone was 1.4mg/ℓO3, the removal rate of bacteria and E-coli from sea-water proved to be 100%. With the same input of ozone, on the other hand, the removal rate of COD turned to be relatively low, 50%, which was to the fact that sea-water consists of salt matter which is a kind of COD matter. This result supports the idea that we can keep using ozone steadily in the future to remove organic matters and bacteria from sea-water because ozone destructs relatively less salt matter in sea-water. Also, the treatment effect rate of SS, turbidity and organic matters such as NH<sub>3</sub>-N, NO<sub>3</sub>-N etc, was very high. As a result, we assume that the treatment of organic matter in sea-water with ozone is very effective.
오관영 ( Kwan-young Oh ),이광재 ( Kwang-jae Lee ),황정인 ( Jeong-in Hwang ),김윤수 ( Youn-soo Kim ) 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.6
본 연구의 목적은 아리랑 영상의 정사영상처리를 보다 효율적으로 개선하기 위한 것이다. 국내외 지구 관측 위성의 개발이 가속화됨에 따라 획득되는 영상의 수와 양이 급증하고 있다. 이에 획득된 영상에 대한 정사영상처리를 보다 빠르고 효율적으로 개선하기 위한 다양한 연구들이 진행되고 있다. 본 연구에서는 GPU 등 하드웨어 컴퓨팅 능력 향상을 제외하고, 알고리즘 개선을 통한 처리 효율 강화에 집중하였다. 이를 위하여 LUT 기반 RFM 방법으로 알고리즘을 개선하였으며, offset 설정에 따라 달라지는 결과를 정확도 및 시간 효율의 측면에서 비교 및 분석하였다. The purpose of this study is to efficiently improve orthorectification of KOMPSAT images. As the development of domestic and abroad earth observation satellites accelerates, the number and amounts of satellite images acquired are rapidly increasing. Accordingly, various studies are being conducted to improve orthorectification for the acquired image more quickly and efficiently. This study focused on enhancing processing efficiency through algorithm improvement, except for improving hardware computing capabilities such as GPU. Accordingly, the algorithm was improved with the LUT-based RFM method, and compared and analyzed in terms of accuracy and time-efficiency that vary depending on offset settings.
Y<sub>2</sub>O<sub>3</sub>-카본 복합체의 전기전도성에 미치는 소결온도의 영향
최관영,오윤석,김성원,김형순,박종훈,이성민,Choi, Kwan-Young,Oh, Yoon-Suk,Kim, Sung-Won,Kim, Hyung-Sun,Park, Chong-Hun,Lee, Sung-Min 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2
The $Y_2O_3$ ceramics have been widely used as plasma resistant materials in the semiconductor industry. In this study, composites made of plasma resistant $Y_2O_3$ and electrically conductive carbon have been produced. The electrical properties of this composite were measured with respect to the size, volume fraction of the conductive carbon phase, and sintering temperature. When micro-sized carbon was used, the composites were insulating up to 5 wt% addition of the carbon. However, when nano-sized carbon of around 60 ~100 nm was used, the composites became conductive over threshold volume fraction of carbon, which increased with increasing sintering temperature. This behavior of electrical conductivity of the composites was discussed in terms of the percolation theory. The percolation threshold of the conductivity seemed to be affected by the grain growth and coalescences of dispersed conductive carbon phases with grain growth of matrix $Y_2O_3$.
오관영(Oh, Kwan Young),정형섭(Jung, Hyung Sup),이하성(Lee, Ha-Seong) 한국측량학회 2014 한국측량학회 학술대회자료집 Vol.2014 No.4
본 논문에서는 널리 사용되고 있는 Component-Substitution 기반의 영상융합 기법을 보완한 보다 효과적인 영상융합 기법을 제안하였다. 제안된 방법은 크게 두 가지 단계로 구분할 수 있다. 첫 번째는 가중 평균된 다분광 영상을 이용한 Intensity 영상의 제작 단계, 두 번째는 최적화된 융합 계수를 통한 고주파 component의 생성 단계이다. 본 알고리즘의 평가를 위해서 KOMPSAT-3 위성영상에 알고리즘을 적용하였고, 기존의 영상융합 알고리즘에 비하여 공간적/분광적인 측면에서 모두 향상된 결과를 나타냄을 확인할 수 있었다. we propose the image fusion method compensated to create high resolution MS image more advanced and enhanced. The proposed method is based on the well-established component substitution (CS) approach. Our method is organized into two parts. The first step is the construction of the intensity image as the weighted average of the MS image. The next step is to produce the weighted high-frequency component, acquired by product of the optimal parameter and high-frequency component. The proposed method is applied to the KOMPSAT-3 satellite. The qualitative and quantitative results showed that proposed method can improve the spectral/spatial quality compared with the previous fusion algorithms.