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Choi, Yuri,Kang, Byungkyun,Lee, Jooyong,Kim, Sunghu,Kim, Gyeong Tae,Kang, Hyunju,Lee, Bo Ram,Kim, Hajin,Shim, Sang-Hee,Lee, Geunsik,Kwon, Oh-Hoon,Kim, Byeong-Su American Chemical Society 2016 Chemistry of materials Vol.28 No.19
<P>The pursuit of exceptionally high photoluminescence (PL) and stability is critical in the development of novel fluorophores for use in challenging bioimaging and optoelectronic devices. Carbon nanodots (CDs) doped with heteroatoms provide a particularly attractive means of effectively tailoring their intrinsic properties and exploiting new phenomena. Here, we report a one-step, scalable synthesis of boron-and-nitrogen co-doped CD (BN-CD) with outstanding optical properties unlike those of nitrogen-doped CD (N-CD) in solid state as well as solution. The detailed mechanistic framework was explored using a series of spectroscopic analyses and ultrafast spectroscopy coupled with density functional theory calculations, which all conclusively confirmed that the presence of more graphitic structures in the core and well-distributed surface states are responsible for the enhanced PL in BN-CD. Furthermore, single-molecule spectroscopy analysis demonstrated that a single BN-CD shows higher PL intensity and enhanced photobleaching time. We anticipate that this study will aid in uncovering the full potential of CDs in various fields.</P>
최윤희 ( Yoonhee Choi ),김서용 ( Seoyong Kim ),김근식 ( Geunsik Kim ) 한국정책학회 2022 韓國政策學會報 Vol.31 No.3
본 연구의 목적은 다차원적인 태양광 에너지 수용성에 대한 결정요인을 비교·분석하는데 있다. 본 연구는 기존 연구들이 태양광 수용성을 다차원적으로 구분하고 있지 않다는 점, 수용성 결정요인에 대한 비교론적 접근이 부족하다는 점에 주목하였다. 연구목적을 위해 태양광 에너지 수용성을 크게 일반적 수용성과 조건적 수용성으로 구분하고, 세부적으로 여섯 개의 차원으로 구분하였다. 태양광 수용성에 영향을 미치는 요인으로 사회인구학적 요인뿐만 아니라 정치·경제적 요인과 위험지각 패러다임 요인을 설정하였다. 설문조사 자료(N=1,020)를 분석한 결과, 첫째, 다차원적으로 구성된 태양광 수용성들에 영향을 미치는 요인이 수용성에 따라 달라지는 것을 알 수 있었다. 둘째, 태양광 수용성 영향요인 차원에서는 정치·경제적 요인보다는 위험지각 패러다임 요인이 수용성에 결정적 영향을 미치는 것으로 나타났다. 특히, 세부 변수별로는 볼 때 긍정적 감정이 높은 설명력을 보이고 있으며, 지각된 편익과 신뢰도 다수의 태양광 수용성 차원에 영향을 미치고 있었다. 반면 불평등 지각은 경제적 유인제공 수용성에만, 지식은 시설 수용성에만 영향을 미치는 차이를 보이고 있었다. 이와 같은 결과는 수용성을 제고하기 위해 수용성의 다차원적 측면을 고려해야 함을 시사한다. The purpose of this study is to compare and analyze the determinants of multidimensional solar energy acceptability. This study paid attention to the fact that the previous studies did not differentiate the acceptability of solar energy in multiple dimensions and the lack of comparative approaches to the determinants of acceptance. For this purpose, acceptance of solar energy was divided into general acceptance and conditional acceptance, finally dividing into six dimensions in detail. In addition, demographic factors as well as political, economic, risk perception paradigm factors were set as independent factors affecting the acceptability of solar energy. As a result of analyzing the survey data (N=1,020), it was found that, first, the factors affecting on the multidimensional acceptance of solar energy were different in terms of acceptability. Second, it was found that risk perception paradigm factors had a decisive influence on acceptability rather than political and economic factors. In particular, by detailed variables, positive emotions showed highest explanatory power in olar acceptability, followed by perceived benefits and trust. On the other hand, perceived inequality only affected the acceptability of economic incentives and knowledge only affected the acceptability of solar energy facilities.
Effects of contact material on complex excitonic behaviour of monolayer MoS<sub>2</sub>
Park, Youngsin,Choi, Soo Ho,Lee, Geunsik,Yang, Woochul,Im, Hyunsik Elsevier 2018 Optical Materials Vol.84 No.-
<P><B>Abstract</B></P> <P>We investigated the optical behaviour of excitons in monolayer MoS<SUB>2</SUB> prepared on a 60 nm-thick metal (Au) ring structure patterned on SiO<SUB>2</SUB>. CVD-grown monolayer MoS<SUB>2</SUB> was transferred to the metal structure and placed in contact with three different environments simultaneously: SiO<SUB>2</SUB>, Au metal and air. The optical properties of the transferred MoS<SUB>2</SUB> on the substrates were characterized through micro-photoluminescence (μ-PL) measurements. PL peaks were observed near ∼1.82 eV for defect-related emission, ∼1.92 eV for an A exciton, which includes a neutral exciton and a trion, and ∼2.1 eV for a B exciton. The optical band gap and exciton-phonon interaction of the samples on the three substrates were investigated by measuring the temperature-dependent photoluminescence.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A chemical vapour deposition (CVD)-grown MoS<SUB>2</SUB> monolayer is transferred to the Au-patterned structure. </LI> <LI> The monolayer MoS<SUB>2</SUB> is placed in contact with three different environments simultaneously: SiO<SUB>2</SUB>, Au, and air (free standing). </LI> <LI> The excitonic emissions from the different contact regions were characterized by temperature-dependent μ-PL. </LI> </UL> </P>
앞먹임 Image-Based Visual Servoing을 이용한 함상 자동 착륙
조강익(Gangik Cho),최준원(Joonwon Choi),배근식(Geunsik Bae),오현동(Hyondong Oh) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
무인비행이동체 (UAVs)의 자율 임무 수행에 있어 자동 착륙은 필수적이다. 특히 함상과 같이 좁고 빠르게 이동하는 목표물에 착륙하기 위해서는 일반적으로 UAV에 사용되는 Global positioning system (GPS)와 같은 정밀도가 낮은 센서를 이용하는 것은 불가능하다. 본 연구에서는 GPS의 낮은 정밀도를 보완하기 위해 영상을 이용한 방법 중 하나인 Image-based visual servoing (IBVS)를 이용한 자동 착륙 방법을 소개한다. 또, 빠르게 전진하는 배의 속도를 보정하기 위해 배에 부착된 GPS를 이용하여 배의 속도를 추정하고 이를 더해주는 앞먹임 IBVS를 소개한다. Autonomous landing are essential for autonomous missions of unmanned aerial vehicles (UAVs). In particular, in order to land on a small and moving fast target such as a ship, it is impossible to use a low-precision sensor such as Global Positioning System (GPS), which is generally used in UAVs. In this study, an autonomous landing method using Image-based visual servoing (IBVS), which is one of the visual control methods to replace GPS with low precision, is introduced. In addition, in order to compensate the velocity of a fast moving forward ship, feed-forward IBVS, which estimates the velocity of the ship using GPS attached on the ship and adds the its velocity as feed-forward term to control scheme is introduced.