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Lee, Daewon,Lee, Jinwoo,Lee, Honggeun,Jin, Sunmi,Hyeon, Taeghwan,Kim, B. ,Moon WILEY-VCH Verlag 2006 Advanced synthesis & catalysis Vol.348 No.1
<P>A new magnetic mesocellular mesoporous silica support featuring a 3D open-pore structure has been developed for highly efficient, filtration-free recycling of chiral ligands for catalytic asymmetric dihydroxylation. Reactions using the ligand immobilized on this magnetic silica system exhibited almost the same reactivity and enantioselectivity as those obtained in the homogeneous reaction. Magnetically recovered ligand could be recycled eight times with good to excellent conservation of reaction rates and enantioselectivities.</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/16154150-2006-348-1-2-ADSC200505354-content.gif' alt='wiley_img/16154150-2006-348-1-2-ADSC200505354-content'> </P>
Wireless powered wearable micro light-emitting diodes
Lee, Han Eol,Lee, Daewon,Lee, Tae-Ik,Shin, Jung Ho,Choi, Gwang-Mun,Kim, Cheolgyu,Lee, Seung Hyung,Lee, Jae Hee,Kim, Yong Ho,Kang, Seung-Mo,Park, Sang Hyun,Kang, Il-Suk,Kim, Taek-Soo,Bae, Byeong-Soo,Le Elsevier 2019 Nano energy Vol.55 No.-
<P><B>Abstract</B></P> <P>Wearable displays are considered as a bilateral communication tool in the hyperconnected era. Although several electronic clothing display was demonstrated, high power consumption issue still remained. Here, we present wireless powered wearable μLEDs (WμLEDs) with excellent stability. A custom-designed wireless power supply system operated a 30 × 30 WμLED array on a fabric. The WμLED stability was intensively investigated under bending, stretching, 85 °C/85% relative humidity and artificial sunlight conditions, showing the suitability of WμLED outdoor usage. Finally, a passive-matrix WμLED display successfully emitted a brilliant red glow on a fabric.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wireless powered wearable μLEDs (WμLEDs) with excellent stability was realized by a custom-designed wireless energy supply system on a fabric. </LI> <LI> WμLED stability was investigated under bending, stretching, 85 °C/85% relative humidity and artificial sunlight conditions, showing the suitability of WμLED outdoor usage. </LI> <LI> A passive-matrix WμLED display successfully emitted a brilliant red glow on a fabric. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이종혁(JongHyuk Lee),진성호(SungHo Chin),이화민(HwaMin Lee),이대원(DaeWon Lee),이필우(PillWoo Lee),유헌창(HeonChang Yu) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
현재 그리드 컴퓨팅에 관한 연구는 그리드 컴퓨팅 인프라의 성공적인 구축과 함께 그리드 컴퓨팅의 응용분야가 확대됨으로써 그리드 컴퓨팅이 제공하는 고성능 연산 자원뿐만 아니라 대용량의 저장장치와 데이터베이스를 이용하기 위한 데이터 그리드에 관한 연구도 활발히 이루어지고 있다. 하지만 데이터 그리드를 이용하는 응용에서 파일을 이용할 기회가 더욱 많음에도 불구하고 데이터베이스에 관한 연구에 비해 파일 데이터에 관한 연구가 미비한 실정이다. 따라서 본 논문에서는 그리드 컴퓨팅 미들웨어의 표준으로 자리 잡고 있는 OGSA를 기반으로 한 그리드 파일 시스템을 설계한다. OGSA 기반 그리드 파일 시스템은 크게 전통적인 파일 시스템과 같은 단일 뷰를 가능케 하는 명명 공간 서비스, 여러 개의 같은 파일을 단일 파일로 보이게 하는 복제 파일 관리 서비스, 파일의 메타 데이터 정보를 관리하는 파일시스템 정보 서비스, 마지막으로 사용자들과 개발자들이 동일한 접근 방식을 이용하도록 하는 서버 · 클라이언트 · 파일 제공자 인터페이스로 구성된다.
Thermodynamic Control of Diameter-Modulated Aluminosilicate Nanotubes
Lee, Hoik,Jeon, Yangjun,Lee, Youngil,Lee, Sang Uck,Takahara, Atsushi,Sohn, Daewon American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.15
<P>The diameter of imogolite nanotubes was regulated by altering the synthesis temperature and was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and <SUP>29</SUP>Si cross-polarization magic angle spinning nuclear magnetic resonance (CP-MAS NMR). Imogolite diameter modulation via thermodynamic control was induced by curvature formation of the proto-imogolite cluster, which was dependent on the degree of silanol (SiOH) substitution. At lower temperature, 323 K, the amount of SiOH substitution in the proto-imogolite clusters decreases and accordingly reduces the hydrogen bonding among SiOH substituents. In contrast, at higher temperature, 371 K, the large amount of SiOH substitution in the proto-imogolite clusters increases the hydrogen bonding among silanol groups, which also increases the degree of the curvature. The proto-imogolite clusters with a larger curvature can quickly create tubular structures by forming a circle with a smaller diameter.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-15/jp411725z/production/images/medium/jp-2013-11725z_0007.gif'></P>
Future Trends of AI-Based Smart Systems and Services: Challenges, Opportunities, and Solutions
Lee, Daewon,Park, Jong Hyuk Korea Information Processing Society 2019 Journal of information processing systems Vol.15 No.4
Smart systems and services aim to facilitate growing urban populations and their prospects of virtual-real social behaviors, gig economies, factory automation, knowledge-based workforce, integrated societies, modern living, among many more. To satisfy these objectives, smart systems and services must comprises of a complex set of features such as security, ease of use and user friendliness, manageability, scalability, adaptivity, intelligent behavior, and personalization. Recently, artificial intelligence (AI) is realized as a data-driven technology to provide an efficient knowledge representation, semantic modeling, and can support a cognitive behavior aspect of the system. In this paper, an integration of AI with the smart systems and services is presented to mitigate the existing challenges. Several novel researches work in terms of frameworks, architectures, paradigms, and algorithms are discussed to provide possible solutions against the existing challenges in the AI-based smart systems and services. Such novel research works involve efficient shape image retrieval, speech signal processing, dynamic thermal rating, advanced persistent threat tactics, user authentication, and so on.
Constructing Sparse Kernel Machines Using Attractors
Daewon Lee,Kyu-Hwan Jung,Jaewook Lee IEEE 2009 IEEE transactions on neural networks Vol.20 No.4
<P>In this brief, a novel method that constructs a sparse kernel machine is proposed. The proposed method generates attractors as sparse solutions from a built-in kernel machine via a dynamical system framework. By readjusting the corresponding coefficients and bias terms, a sparse kernel machine that approximates a conventional kernel machine is constructed. The simulation results show that the constructed sparse kernel machine improves the efficiency of testing phase while maintaining comparable test error.</P>
Adaptive Visual Servo Control For A Quadrotor Helicopter
Daewon Lee,H. Jin Kim 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
An adaptive image-based visual servo (IBVS) control for a quadrotor helicopter is proposed in this paper. By employing the adaptive gain in the IBVS control method, performance and stability of the under-actuated system are improved. The performance of the overall approach is validated by numerical and vision integrated hardware-in-the-loopsimulation (HILS) with the nonlinear quadrotor helicopter dynamics.
Estimating Basin of Attraction for Multi-Basin Processes Using Support Vector Machine
Daewon Lee,Jaewook Lee 한국경영과학회 2012 Management Science and Financial Engineering Vol.18 No.1
A novel method of transient stability analysis is presented in this paper. The proposed method extracts data points near the basin-of-attraction boundary and then builds a support vector machine (SVM) model learned from the generated data. The constructed SVM classifier has been shown to reduce dramatically the conservativeness of the estimated basin of attraction.