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Park, Byoungchoo,Kim, Mina,Kim, Sun Woong,Jang, Wongun,Takezoe, Hideo,Kim, Yunki,Choi, Eun Ha,Seo, Yoon Ho,Cho, Guang Sup,Kang, Seung Oun WILEY-VCH Verlag 2009 Advanced Materials Vol.21 No.7
<B>Graphic Abstract</B> <P>A liquid-crystal/polymer composite is used to produce a photonic bandgap system. Films of the composite show a large field-induced reversible color shift of the reflection band of over 150 nm. Intensity-controllable laser emission at relatively low lasing thresholds is generated from composite films doped with dye. Moreover, the laser exhibits omnidirectional emission propagation on application of an electric field. <img src='wiley_img/09359648-2009-21-7-ADMA200800729-content.gif' alt='wiley_img/09359648-2009-21-7-ADMA200800729-content'> </P>
Twin-Image Elimination in an In-Line Digital Holographic Microscope
Hyungjun Cho,Younghun Yu,Doocheol Kim,Jung-Young Son,Sanghoon Shin,Wongun Jang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
A novel method is employed to eliminate the twin images in the so-called ``in-line" digital holographic microscope. We could develop a digital holographic microscope that can solve the problems of overlapping of real and imaginary images and eliminate one of them by padding and removing the DC term by using an averaging method. The entire process requires only one digital hologram. A novel method is employed to eliminate the twin images in the so-called ``in-line" digital holographic microscope. We could develop a digital holographic microscope that can solve the problems of overlapping of real and imaginary images and eliminate one of them by padding and removing the DC term by using an averaging method. The entire process requires only one digital hologram.
Development of a scalable tabletop display using projection-based light field technology
Shim Hamong,Lee Dongkil,Park Jongbok,Yoon Seonkyu,Kim Hoemin,Kim Kwangsoo,Heo Daerak,Kim Beomjun,Hahn Joonku,Kim Youngmin,Jang Wongun 한국정보디스플레이학회 2021 Journal of information display Vol.22 No.4
We present a light-field display optical system design, state-of-the-art hardware technology, and computational software that are readily scalable (due to their modular structure) and provide naturally immersive and volumetric display systems. We explain the integration of 72 microprojectors into the tabletop display system. In addition, we used 6 workstations for all images and 18 highperformance graphics processing units. Sophisticated image generation through author tooling and the pixel re-arrangement algorithm in the Unity engine enabled us to produce complete threedimensional images from the radiant rays of two-dimensional pixels using diffuser screens and microlens arrays.