• Information Display
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• v.6 no.6
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• pp.21-29
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• 2005

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.5A
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• pp.688-695
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• 2000

We present a multi-view autostereoscopic display system based on volume holographic storage technique. In this proposed system, the interference pattern of spatial multiplexed plane reference and angular multiplexed plane object beams are recorded into a photorefractive crystal, which plays a role of guiding object beams of multi-view images into the desired persfective directions. For reconstruction, object beams containing the desired multi-view image information, which satisfy Bragg matching condition, are illuminated in the time-division multiplexed manner onto the crystal. Then multiple stereoscopic images are Projected to the display plane for autostereoscopic 3D viewing.

• Journal of the Korea Computer Industry Society
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• v.2 no.12
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• pp.1609-1616
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• 2001

We present an autostereoscopic 3D display system using volume hologram. In this proposed system, the interference pattern of angular multiplexed plane reference and object beams are recorded into a volume hologram, which plays a role of guiding object beams of multi-view images into the desired perspective directions. For reconstruction, object beams containing the desired multi-view image information, which satisfy Bragg matching condition, are illuminated in the time-division multiplexed manner onto the crystal. Then multiple stereoscopic images are projected to the display plane for autostereoscopic 3D viewing. It is possible to make a high resolution multiview 3D display system independent upon the viewpoint.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.2
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• pp.22-27
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• 2000

We present a sequential stereoscopic display system using volume holographic storage. Multiple angular multiplexed stereoscopic image pairs are recorded into a photorefractive crystal that can store data with high density, transfer them with high speed, and select a randomly chosen data element. The reference beam with Bragg selectivity is scattered by the index grating and the diffracted beams are propagating along the directions of the stereoscopic image pairs. The images are to be suitably projected on the left and right display plane sequentially for stereoscopic video viewing.

• Journal of the Semiconductor & Display Technology
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• v.3 no.3
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• pp.19-21
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• 2004

This paper presents a 3-dimensional diffusion simulation with adaptive solution strategy. The developed diffusion simulator VLSIDIF-3 was designed to re-refine areas. Refine scheme was calculated by the difference of doping concentration between any of two nodes. Each element is greater than tolerance and redo diffusion process until error is tolerable. Numerical experiment in low doping diffusion problem showed that this adaptive solution strategy is very efficient in both memory and time, and expected this scheme would be more powerful in complex diffusion model.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2004.05a
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• pp.55-58
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• 2004

This paper presents a 3-dimensional diffusion simulation with adaptive solution strategy. The developed diffusion simulator VLSIDIF-3 was designed to re-refine areas where difference of doping concentration between any of two nodes of each element is greater than tolerance and redo diffusion process until error is tolerable. Numerical experiment in low doping diffusion problem showed that this adaptive solution strategy is very efficient in both memory and time, and expected this scheme would be more powerful in complex diffusion model.

• Korean Journal of Optics and Photonics
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• v.9 no.6
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• pp.385-389
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• 1998

In this paper, we propose an optical correlator system using volume holograms for database of matched filters. Optical correlator has high speed and parallel processing characteristics of optics. Matched filters are recorded into a volume hologram that can store data with high density, transfer them with high speed, and select a randomly chosen data element. The multiple reference images of database are prerecorded in a photorefractive crystal in the form of Fourier transform images, simply by passing the image displayed in a spatial light modulator through a Fourier transform lens. The angular multiplexing method for multiple holograms of database can be achieved by rotating the crystal by use of a step motor. Experimental results show that the proposed system can be used for the fingerprint recognition.

• Journal of the Korean Society of Safety
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• v.14 no.4
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• pp.204-210
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• 1999

We propose an optical fingerprint identification system using volume hologram for database of matched filter. Matched filters in VanderLugt correlator are recorded into a volume hologram that can store data with high density, transfer them with high speed, and select a randomly chosen data element. The multiple reference fingerprint photographs of database are prerecorded in a photorefractive material in the form of Fourier transform images, simply by passing the image displayed in a spatial light modulator through a Fourier transform lens. The angular multiplexing method for multiple holograms of database is achieved by controlling the reference directions with a step motor. Experimental results show that the proposed system can be used for secure entry systems to identify individuals for access to a restricted area, security verification of credit cards, passports, and other IDs.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.500-500
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• 2012

플라즈마 디스플레이 패널(PDP)는 미소체적의 dielectric barrier discharge (DBD)를 이용한 한 예로 볼 수 있다. PDP 셀은 실험을 통하여 방전 특성을 분석하기에 아주 작은 크기이기 때문에 시뮬레이션을 이용하는 것이 방전 특성을 분석하기에 유용하다. 시뮬레이션 방법 중 유체 시뮬레이션은 높은 압력에서 기체 방전을 분석하기에 아주 유용한 방법이다. PDP 전극 각도를 바꿈으로써 발광 효율을 높일 수 있음이 논문으로 발표 되었다. 이 발표에서는 2차원 유체 시뮬레이션을 사용하여 전극의 각도 변화뿐만 아니라 전극 간격과 압력 변화에 따른 방전 특성 변화를 연구하였다. 평판 전극의 각도 변화에 따라 전기장 세기, 방전 공간 내 전하 및 여기된 입자수 및 분포, 방전 개시 전압 등의 진단을 통하여 결과를 분석하였다. 전극 간격이 길어질수록 convex 구조의 효율 증가가 크게 나타났으며 압력이 커질수록 concave 구조의 효율 증가가 크게 나타났다.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2003.12a
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• pp.59-63
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• 2003

체적 음향파 공진기(Film bulk acoustic resonator, FBAR)는 2~10 Ghz 대역의 차세대 이동 통신용 구현에 필수적인 부품이기 때문에 국내외에서 활발한 연구가 진행되고 있다. 본 논문에서는 FBAR 소자 제조를 위한 연구에서 원자층 증착(Atomic layer deposition, ALD) 방법에 의한 ZnO buffer layer 위에 스퍼터링 방법을 이용한 2-step 방법을 사용하여 제조하였다. ALD를 이용한 ZnO buffer layer는 diethylzinc(DEZn)/$H_2O$를 순차적으로 주입하여 증착하였다. 이 때 두 원료물질 사이에 고순도 Ar 가스를 purge gas로 사용하였다. 원료의 주입시간은 1초, 원료간 purge 시간은 23 초로 하고 증착하였다. 2-step 방법을 이용할 경우, 스퍼터링 방법만을 이용하였을 때 보다 우수한 c-축 배향성 및 박막의 표면형상이 관찰되었다. 2-step 방법을 FBAR 소자 제작에 적용할 경우 보다 우수한 특성의 공진기를 제작할 수 있을 것으로 기대된다.