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김재후 ( Jae Hoo Kim ),임윤철 ( Yoon Chul Rhim ) 정보저장시스템학회 2015 정보저장시스템학회논문집 Vol.11 No.1
An archive system is designed to store data for a long time without loss. However, many important factors such as temperature, dust, vibration, and humidity must be considered to design a successful archive system. Read/write devices, for example optical disk drives(ODDs), in an archive system generate heat while they are in operation. Fans are usually used to remove heat but the air flow accompanies dust into the system result in system failure. In this study, an archive system with six ODDs is chosen as an analysis model and flow together with temperature distributions are computed using a CFD simulation package. Flow analysis is focused on four cooling fans at the rear panel and temperature distribution is studied for various cases of fan operation. From the temperature point of view, fans give significant effects on 4th to 6th ODDs compared to the 1st to 3rd ODDs. Also, it is noticed which fan is the most important as far as cooling is concerned.
광변색 회절 이미지 형성을 위한 트라이아진계 메타아크릴레이트 모노머를 포함한 광고분자 필름의 특성평가
오현진,이지예,김은경,Oh, Hyun-Jin,Lee, Ji-Yea,kim, Eun-Kyoung 정보저장시스템학회 2007 정보저장시스템학회논문집 Vol.3 No.4
A photo-reactive methacrylate monomer having triazine as a core component was examined for photochromic diffractive image formation. Photochromic photopolymer films as a recording media contained a monomer mixture of triazine difunctional metharylate (DT) and ethylene glycol phenyl ether acrylate, binder polymer, photo initiator, and a photochromic spiro-oxazine dye. The content of photochromic dye was changed to examine the effect of photochromophore on diffraction efficiency and real holographic image formation. Holographic recording was performed on the photopolymer film by the combination of reference and probe beam. The diffraction efficiency of the photopolymer film in real-time measurement reached a maximum of $\sim90%$ within 30s. It was highly dependent on the photochromophore contents. After holographic recording, the color of the recorded area was changed under UV light (365 nm) and reversibly bleached to original color upon exposure to a visible light source. Films containing only photochromophore without monomer mixture were not reactive under the recording beam (491nm). Diffractive image formation and mechanism of the holographic recording in the presence of photochromophore will be presented.
SIL 기반 플라즈모닉 리소그래피에서 주파수 적응형 필터를 이용 한 나노간극 제어의 성능향상
최국종 ( Guk Jong Choi ),임건 ( Geon Lim ),박노철 ( No Cheol Park ) 정보저장시스템학회 2014 정보저장시스템학회논문집 Vol.10 No.1
Plasmonic lithography is the latest technique to overcome diffraction limit of previous optical lithography. In the plasmonic lithography, the nano gap between nano metal wave guide and photoresist should be in sub-wavelength region. SIL-based plasmonic lithography is the one of the solutions to maintain small air gap. However, the nano gap control is so sensitive that a little disturbance is able to have a large effect on the nano gap control. So, we analyzed the characteristics of disturbance, and then modified the previous controller to suppress the disturbance. We applied two peak filters which were fixed one and adaptively changeable one. We experimentally confirmed the improvement of the nano gap control, which reduced nano gap error by 30 %. The proposed control will improve the quality of lithography pattern.