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First-Principles Study on the Electronic Structure of Bulk and Single-Layer Boehmite
손승욱,김동욱 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.12
Two-dimensional (2D) or layered materials have a great potential for applications in energy storage, catalysis, optoelectronics and gas separation. Fabricating novel 2D or quasi-2D layered materials composed of relatively abundant and inexpensive atomic species is an important issue for practical usage in industry. Here, we suggest the layer-structured AlOOH (Boehmite) as a promising candidate for such applications. Boehmite is a well-known layer-structured material and a single-layer can be exfoliated from the bulk boehmite by breaking the interlayer hydrogen bonding. We study atomic and electronic band structures of both bulk and single-layer boehmite, and also obtain the single-layer exfoliation energy using first-principles calculations.
손승욱 ( Seungwook Son ),안한세 ( Hanse Ahn ),이나연 ( Nayeon Lee ),안윤호 ( Yunho An ),정용화 ( Yongwha Chung ),박대희 ( Daihee Park ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.1
CNN 기반 객체 탐지기의 발전으로 돈사에서 돼지 모니터링이 가능하지만, 실제 농가에서 적용하기 위해서는 영상에서 돈사의 조명에 직접 노출된 돼지들이 노출 과다 현상에 의해 탐지되지 않는 문제가 여전히 남아있다. 이러한 문제점은 싱글 모델로서는 정확도 개선의 한계가 있어, 복수개의 모델을 이용한 모델 앙상블 기법을 제안한다. 특히 본 연구에서 제안하는 영상 처리 기법을 사용하여 생성된 상호 보안적인 데이터를 통해 학습된 두 개의 TinyYOLOv4 모델을 결합하면, 돼지 객체 탐지의 정확도가 하나의 TinyYOLOv4 모델에 비하여 획기적으로 개선되었음을 확인하였다.
손승욱(Seung Wook Son),이재승(Jae-Seung Lee) 동아시아국제정치학회 2017 국제정치연구 Vol.20 No.1
This paper examines why the LNG supply-demand strategies of Korea and Japan, two biggest LNG buyers of the world, have changed and analyzes the key factors that have driven those changes. Korea and Japan share the common interests in the global LNG market and receive undistinguishable effects when existing energy situation is transformed, Even though they have been placed in similar conditions, the changes of global LNG market–oversupply and demand reduction–brought diverse responses from the two countries. Korea maintained the existing strategies due to institutional, market structural and price factors, while Japan shifted its stance toward the market-oriented competition emphasizing the subject of liquidity. This study suggests that a comparison between the differentiated LNG supply-demand strategies of Korea and Japan would enhance the feasibility of policy cooperation of two countries to improve the Northeast Asian LNG cooperation.
가시광선 반응형 광촉매의 질소산화물(Nox) 제거 성능 평가
손승욱(Son Seung-wook),전기용(Jeon Ki-Yong),김화중(Kim Wha-Jung) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
Recently, indoor air pollution is issued due to closed building for saving energy emerged. In this study, to solve the problem, photocatlysts were investigated. Photocatlysts are harmless to human body and remove air pollutant. In order to activate photocatalysts in visible ray, experiments was conducted to dop transition metal elements on photocatlysts. Transition metal elements were added to Ti0₂ by 3%, 6%, 9% and heated by 600℃, 800℃ and 1000℃ to make the samples.