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Jeong, Jinyoung,Park, Dabin,Lee, Ji-Hoon OSA OPTICAL SOCIETY OF AMERICA 2016 Applied Optics Vol.55 No.31
<P>We proposed a method of eliminating the bending-induced retardation of a plastic film by coating it with a polymer layer with an opposite birefringence. We coated a polystyrene (PS) or a poly(methyl methacrylate) (PMMA) layer on a polycarbonate (PC) plastic film. The bare PC film is composed of main-chain-type polymers and showed an increase in retardation with bending. The main-chains of the PC polymer are reoriented along the circular arc direction during bending, resulting in a positive birefringence. In contrast, the 11 wt. % PS-coated and the 19 wt. % PMMA-coated PC films showed minimal change in the retardation regardless of the radius of curvature. The PS and the PMMA polymers are of the side-chain-type, and the side-chains were aligned perpendicular to the circular arc direction during bending, resulting in a negative birefringence. Consequently, the bending-induced retardation of the PC film can be compensated by the PS or the PMMA layer during bending of the film. This method of compensating for the bending-induced retardation of the plastic film can be useful for flexible display applications. (C) 2016 Optical Society of America</P>
Jeong, Jinyoung,Cho, Miyoung,Lim, Yong Taik,Song, Nam Woong,Chung, Bong Hyun WILEY-VCH Verlag 2009 Angewandte Chemie Vol.48 No.29
<P>Bright lights: Fullerene–silica hybrid nanoparticles have bright photoluminescence, high photostability, and low cytotoxicity, which are assets for bioimaging agents. The origin of the photoluminescence of the nanoparticle is the C–O–Si bond (see picture). <img src='wiley_img_2010/14337851-2009-48-29-ANIE200901750-content.gif' alt='wiley_img_2010/14337851-2009-48-29-ANIE200901750-content'> </P> <B>Graphic Abstract</B> <P>Bright lights: Fullerene–silica hybrid nanoparticles have bright photoluminescence, high photostability, and low cytotoxicity, which are assets for bioimaging agents. The origin of the photoluminescence of the nanoparticle is the C–O–Si bond (see picture). <img src='wiley_img_2010/14337851-2009-48-29-ANIE200901750-content.gif' alt='wiley_img_2010/14337851-2009-48-29-ANIE200901750-content'> </P>
Jinyoung PARK,Ik Je Choi,Jong-Chul Jeong,Jong Kyun Park 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.10
This study to figure out the diversity patterns and community structures of ground beetle of the Gyebang Mountain newly is incorporated into Odaesan National Park, Korea. A total of 47 species belonging to 20 genera of 12 subfamilies were identified from 483 collected ground beetles. Species richness was high in Pterostichinae (18 species, 39%), Carabinae (8 species, 18%), Harpalinae (7 species, 15%), Lebiinae (3 species, 7%), Bembidiinae and Nebriinae (2 species, 5%) and others (1 species, 2%). Twenty-three species were brachypterous and 24 species were macropterous. The dominant species was Synuchus nitidus (19.05%) and a subdominant species was Eucarabus cartereti cartereti (14.49%). Dominance, species diversity, species richness, and species evenness index were 0.56, 3.00, 3.85 and 0.70, respectively. Also, Acoptolabrus mirabilissimus ssp. 1 is discovered in the Mt. Gyebang area for the first time.
Jeong, Jinyoung,Cho, Miyoung,Lim, Yong Taik,Song, Nam Woong,Chung, Bong Hyun WILEY-VCH Verlag 2009 Angewandte Chemie Vol.121 No.29
<P>Strahlemänner: Fulleren-Siliciumdioxid-Hybridnanopartikel verfügen über helle Photolumineszenz, hohe Photobeständigkeit und geringe Zelltoxizität – alles Vorteile bei der Verwendung als Bildgebungsagentien für biologische Proben. Die Photolumineszenz der Nanopartikel beruht auf den C-O-Si-Bindungen (siehe Bild). <img src='wiley_img_2010/00448249-2009-121-29-ANGE200901750-content.gif' alt='wiley_img_2010/00448249-2009-121-29-ANGE200901750-content'> </P>
Jinyoung Jeong,Yu-Jin Choi,Kwang-Un Jeong,Ji-Hoon Lee 한국광학회 2018 Current Optics and Photonics Vol.2 No.3
We investigated the dependence of the retardation dispersion on the polarization direction of ultraviolet (UV) light during the photopolymerization of self-organized smectic reactive mesogen (RM) molecules. RM retarder film that was photopolymerized with UV light linearly polarized parallel to the layer plane showed negative dispersion (ND) of retardation for a wide range of UV polymerization temperatures. On the other hand, film that was photopolymerized with unpolarized UV light showed negative dispersion in a narrow range of UV polymerization temperatures. With a certain UV polymerization temperature, the dispersion of retardation was converted from positive to negative, depending on the UV polarization.