• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.259-260
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• 2009

• Journal of Broadcast Engineering
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• v.25 no.6
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• pp.935-943
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• 2020

In this paper, we propose a method using deep learning for high-resolution display of phase holograms. If a general interpolation method is used, the brightness of the reconstruction result is lowered, and noise and afterimages occur. To solve this problem, a hologram was trained with a neural network structure that showed good performance in the single-image super resolution (SISR). As a result, it was possible to improve the problem that occurred in the reconstruction result and increase the resolution. In addition, by adjusting the number of channels to increase performance, the result increased by more than 0.3dB in same training.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.281-281
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• 2006

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.10
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• pp.1751-1758
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• 2008

Digital holography interference pattern generated by a computer calculation (CGH) is one of the most expensive contents and its usage is being expanded. Thus, it is highly necessary to protect the ownership of digital hologram. In this paper a hologram-domain and a frequency-domain electronic watermarking schemes were proposed. The hologram-domain scheme was only to compare the results to the ones from frequency-domain scheme and the frequence-domain scheme used 2-dimensional against the attaks. Especially the MDWT-domain scheme was very high robustness such that th error ratio at the worst case was only 3%. Thus, we expect that it is used as a good watermarking scheme of digital hologram with high performance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.552-555
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• 2016

Currently it is increasingly commercialized "Mirror Display" is installed the mirror in front of Beauty salon chairs, cosmetic corner and shopping corner of the large department stores. It can go out on to earn additional revenue by showing advertising with a particular service. Speaking conventional mirror were used simply for the purpose of seeing yourself, in this paper, "Mirror Display" provides Weather forecast, Calender, time, Traffic information and important news according to the user's setting by downsizing this at home. Also by combining these technologies, by showing the information required in the 3D output method it will be able to maximize the nature of the mirror. "Hologram Mirror Display" is implemented to raise user satisfaction.

• Electronics and Telecommunications Trends
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• v.31 no.5
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• pp.70-79
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• 2016

최근 들어 초다시점 미디어, 홀로그램과 같은 미래 지향적 미디어 기술에 대한 연구가 활발히 진행되고 있다. 초다시점 미디어는 기존의 무안경식 3D 기술의 단점을 극복하기 위하여 양안에 보일 수 있는 시점의 개수를 증가시킨 미디어로 홀로그램 기술 이전의 상용화 기술로 각광받고 있다. 현재까지의 기술은 초다시점 미디어를 획득, 부호화, 이를 디스플레이하기 위한 기술에 치우쳐 있다. 그러나, 미래의 다양한 서비스에 접목하기 위해서는 초다시점 미디어를 효과적으로 전송하는 기술에 대한 연구가 필요하다. 초다시점 미디어는 시점의 수가 많으므로 대용량의 데이터 전송 기술이 필요하고, 전송 중 데이터의 오류가 발생할 경우 그 시점의 뷰 자체가 사용되지 못하기 때문에 그 특성을 반영한 기술 개발이 필요하다. 본고에서는 현재까지의 초다시점 획득, 디스플레이 기술에 대한 동향을 간략하게 살펴보고, 초다시점 미디어의 전송 기술로 많이 연구되고 있는 MPEG의 DASH 및 MMT 기술과 이러한 전송 기술을 이용하는 서비스 혹은 개발 중인 기술에 대하여 살펴보고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.563-566
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• 2020

본 논문은 초고해상도 컴퓨터 홀로그램 생성을 위한 GPU 기반 2D Shift-FFT 의 효율적인 구현 방법을 제안한다. 본 연구가 제안하는 알고리즘은 기존에 여섯 단계로 이루어진 처리과정을 다섯 단계로 줄임으로서, 병렬처리에서 비효율적인 메모리 접근 과정을 줄인다. 또한, 핀드(pinned) 메모리 기반의 CPU-GPU 데이터 통신 통로인 핀드 버퍼(pinned buffer)를 사용하고 다중 스트림을 채용함으로써, GPU 활용의 주요 병목원인이 되는 데이터 통신의 부하를 줄이고 GPU 활용 효율을 높인다. 본 연구는 제안하는 알고리즘의 효용성을 증명하기 위해 서로 다른 두 시스템에 알고리즘을 구현하고, 다양한 크기의 행렬에 대한 2D-FFT 처리에 대한 성능을 측정하였다. 그 결과, CPU 기반의 FFTW 라이브러리 대비 최대 3 배, 동일한 GPU 를 사용하는 cuFFT 라이브러리 대비 최대 1.5 배 높은 성능을 달성하였다. 이러한 결과는, 본 연구가 제안하는 알고리즘의 효용성을 보여주는 결과다.

• The Korean Journal of Pesticide Science
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• v.7 no.1
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• pp.1-11
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• 2003

Acoording to improvement of HTOS (high throughput organic synthesis) and HTS (high throughput screening) technique, the CoMFA (comparative molecular field analysis), CoMSIA (comparative molecular similarity indeces analysis) and molecular HQSAR (hologram quantitative structure-activity relationship) analysis techniques as methodology of computer assisted molecular design (CAMD) were introduced generally and summarized for some application cases.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.8
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• pp.1424-1433
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• 2007

In this paper, we propose a hardware architecture to generate digital hologram using the modified CGH (Computer Generated Hologram) algorithm for hardware implementation and design to FPGA (Field Programmable Gate Array) platform. After analyzing the CGH algorithm, we propose an architecture of CGH cell which efficiently products digital hologram, and design CGH Kernel from configuring CGH Cell. Finally we implement CGH Processor using CGH Kernel, SDRAM Controller, DMA, etc. Performance of the proposed hardware can be proportionally increased through simply addition of CGH Cell in CGH Kernel, since a CGH Cell has operational independency. The proposed hardware was implemented using XC2VP70 FPGA of Xilinx and was stably operated in 200MHz clock frequency. It take 0.205 second for generating $1,280{\times}1,024$ digital hologram from 3 dimensional object which has 40,000 light sources.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.3C
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• pp.255-261
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• 2008

Conventional look-up table(LT) has gained a lot of speed increase in generation of digital holograms for 3D objects, but it has required an enormous memory size of the LT. In this paper, a novel approach to dramatically reduce the size of the conventional LT, still keeping its advantage of fast computational speed is proposed, which is called here a N-LT(novel look-up table) method. In the proposed method, only the fringe patterns of the center points on each image plane are pre-calculated, called elemental fringe patterns and stored in the look-up table. Then, the fringe patterns for other object points on each image plane can be obtained by simply shifting this pre-calculated elemental fringe pattern according to the displaced values from the center to those points and adding them together. Some experimental results revealed that the computational speed and the required memory size of the proposed approach are found to be 48.7 times faster than that of the ray-tracing method and 217 times smaller than that of the conventional LT method, respectively.