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Control of liquid crystal pretilt angles by using organic/inorganic hybrid interpenetrating networks
Ahn, Dowon,Jeong, Yong-Cheol,Lee, Seungwoo,Lee, Jihye,Heo, Yongjoon,Park, Jung-Ki The Optical Society 2009 Optics express Vol.17 No.19
<P>A new photoalignment method of controlling the pretilt angle of liquid crystals (LCs) by using organic/inorganic hybrid interpenetrating polymer networks (IPNs) is proposed and demonstrated. In the hybrid IPN alignment layer system, the competition between poly(vinyl cinnamate) (PVCi) favoring planar alignment and poly(dimethyl siloxane) (PDMS) favoring vertical alignment made it possible to achieve pretilt angle in a wide range from 0 degrees to 90 degrees, and adjust pretilt angle as a function of PDMS content. In addition, we achieved the high azimuthal anchoring energy at the intermediate pretilt angle by using PDMS as the vertical-aligning component.</P>
Optimized motion simplification for crowd animation
Ahn, Junghyun,Oh, Seungwoo,Wohn, Kwangyun John Wiley Sons, Ltd. 2006 COMPUTER ANIMATION AND VIRTUAL WORLDS Vol.17 No.3
<P>Simulating a huge number of articulate figures in a real-time application is one of the challenging research topics in character animation. Several researchers have tried to improve the performance of animation using the image-based technique such as ‘impostor.’ This method improved the speed of the animation; however, the accuracy, memory, and interactivity problems related to motion remain to be resolved. In this regard, a ‘motion simplification’ framework for an articulate figure is proposed, which not only improves the speed of the animation but also conserves the features of the original motion. First, the motion sequence is analyzed using mean shift clustering for the purpose of extracting key postures and automatically generating the priority of joint reductions. These motion analysis results are directly utilized as the input of the proposed posture optimization. The least square method is applied in order to minimize the error between the original and the simplified posture. Finally, how to apply the proposed simplified motion in a real-time application without decreasing the visual quality of the scene is shown. The experimental result shows that the proposed motion simplification can be successfully applied in a real-time animation system. Copyright © 2006 John Wiley & Sons, Ltd.</P>
Development of 100-kCi Tritium Transport Vessel
Seungwoo Paek,Min Soo Lee,Kwang-Rag Kim,Do-Hee Ahn,Kyu-Min Song,Soon-Hwan Sohn IEEE 2010 IEEE transactions on plasma science Vol.38 No.3
<P>In this paper, a tritium storage and transport vessel was designed and manufactured to use the tritium of Wolsong TRF for the tritium industry. Uranium and zirconium-cobalt (ZrCo) metals were selected for the tritium storage materials. The transport vessel was designed on the basis of Type-B transportation package standards. The vessel was composed of a steel drum, inner packing materials, and a storage bed. The safety of the transport vessel was evaluated by structural and thermal analyses.</P>
Ahn, Dowon,Jeong, Yong-Cheol,Lee, Seungwoo,Park, Jung-Ki Optical Society of America 2010 Optics letters Vol.35 No.18
<P>The micropatterned poly(vinyl cinnamate) (PVCi) alignment layers are fabricated by a solvent-assisted micromolding method. Without UV irradiation, the alignment layer can induce the unidirectional liquid crystal (LC) orientation, which is influenced by topography-based anchoring energies. With photodimerization of PVCi by UV irradiation, we could modulate the anchoring energies caused by chemical interactions of the alignment layer. It is observed that these two different contributions compete against each other in determining LC rotation on the surface of the alignment layer. The rotation angle of LC directors could be controlled from 45° to 70° by simply changing the UV exposure dose.</P>
안도희,백승우,강희석,최희주,정흥석 한국공업화학회 2003 응용화학 Vol.7 No.2
Wolsong Tritium Removal Facility(WTRF) is being constructed at Wolsong Nuclear Power Plant for reduction of the radiation hazards from tritium. The Liqiud Phase Catalytic Exchange (LPCE) process developed by KAERI and KEPRI was selected for the transfer process in WTRF. Approximately 2,000 litres of the hydrophobic platinum catalyst will be charged in the LPCE column. It was estimated that more than half of material cost for the catalyst preparation arised from H₂PtCl-(6) as a platinum precursor and high purity hydrogen gas as a reducing agent. In order to reduce material costs for the catalyst preparation, various catalysts were prepared and characterized using three kinds of H-(2)PtCl-(6) and two kinds of high purity hydrogen gas. It appears from the experiment that characteristics of the catalyst does not depend on both a kind of H₂PtCl_(6) and purity of hydrogen in the experimental conditions.