• Journal of the Korean Society of Tobacco Science
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• v.23 no.2
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• pp.133-140
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• 2001

PAP-I cDNA was synthesized from total RNA of Phytolacca americana leaves by RT-PCR, and then subcloned to recombinant vector pBluescript II SK-. Using PCR with primers designed in our laboratory, we could get the 9 deletion mutant PAP-I cDNA fragments. The first of the fragments was deleted by 66bp from immature N-terminal and then the rest were deleted by 90bp sequentially. Sequentially deletion mutant PAP-I cDNAs were inserted to pAc55M, on down-stream of gall promoter. Recombinant pAc55M was transformed to yeast cells, psy1 and the cells were spreaded on SC_urn-/glucose plate media. Colonies on SC_ura-/glucose plate were streaked on the same position of SC_ura-/glucose and SC_ura-/galactose plate, and we selected colonies growing on both plates, which carry non-cytotoxic deleted mutant PAP-I cDNA. We selected 4 deletion mutant PAP-I cDNAs which have not cytotoxicity.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2004.11a
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• pp.103-106
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• 2004

본 논문에서는 PC 기반 지상파 DMB(Terrestrial Digital Multimedia Broadcasting, T-DMB) 수신기를 위한 SW 최적화에 대해 설명한다. 이 수신기는 PC 외부에 지상파 DMB 신호를 안테나로 수신하여 복조하고 채널 복호하는 프론트 엔드(front-end) 수신 모듈을 이용, USB를 통하여 RS(Reed-Solomon) 부호화된 MPEG-2 TS(Transport Stream) 데이터를 읽어 들여 RS 복호, TS 역다중화, 비디오 복호, 오디오 복호 등의 SW 처리 과정을 거쳐 디스플레이 상에 수신 내용을 표시하게 된다. 본 논문에서는 저사양 PC에서도 T-DMB를 수신할 수 있도록 H.264/MPEG-4 AVC(Advanced Video Coding) 복호 과정을 최적화한 결과에 대해 설명한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.339-342
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• 2012

증강방송 서비스는 하이브리드 방송(Hybrid Broadcasting) 환경 하에서 IP망을 통해 전송받은 증강 콘텐츠를 방송 프로그램과 같이 보여줌으로써 스마트TV와 같은 단말을 통해 증강 현실을 제공하는 서비스이다. 증강방송 서비스를 제공하기 위해서는 증강 콘텐츠의 위치(서버), 증강 콘텐츠가 표시될 화면상의 위치 및 시간 정보 등의 증강 콘텐츠 연동정보가 필요하다. 본 논문에서는 MPEG-2 SYSTEM: Transport Stream의 서술자(Descriptor)를 통해 증강 콘텐츠 연동정보를 전송하는 방법 및 IP망의 증강 콘텐츠를 이용한 증강방송시스템을 제안한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2002.11a
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• pp.105-109
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• 2002

The main ideas of hybrid video coding methods are to reduce the spatial and temporal redundancy for efficient data compression. If compressed video stream is transmitted through the error-prone channel, bitstream can be critically damaged and the spatio-temporal error propagates through successive frames at the decoder because of drift noise in the references between encoder and decoder. In this paper, I propose the lagrangian multiplier selection method in the error-prone environment. Finally, it is shown that the performance comparisons of the R-D optimized mode decision are made against the conventional method and simulation results are given in the following.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1997.11a
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• pp.39-43
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• 1997

본 논문에서는 ActiveMovie와 같은 stream data 기반의 library에서 실시간으로 사용될 수 있는 영상 특수효과 filter들을 소개하고, 알고리즘 개발 및 구현방법에 대해 기술한다. ActiveMovie는 기본적으로 mpeg decoder 및 Video for Windows(.avi file) decoder를 제공하여 프로그래밍을 수월하게 한다. 또한 각 module에 filter라는 개념을 도입하고 filter graph라는 구조를 이용하여 filter의 추가, 삭제를 용이하게 한다. 본 논문에서는, 디지털 영상 특수효과 중에서 Mosaic, Wind, Ghosting 등의 point processing filter들을 실시간으로 처리하기 위한 고속의 알고리즘을 제안한다. 제안하는 알고리즘은 픽셀의 포인터를 특정 위치로 이동시키지 않고 단순히 주소값을 하나씩 증가시키는 연산을 이용하여 실시간 특수효과를 얻을 수 있도록 한다. 또한 이와 같은 특수효과 알고리즘들을 ActiveMovie환경에서 구현함으로써 제안된 기법에 의하여 실시간 동영상 특수효과 처리가 가능함을 입증한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1997.11a
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• pp.63-67
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• 1997

The ISO(International Standard Organization) has standardized MPEG-2 audio. The MPEG-2 audio compression algorithm is based upon subband analysis and exploits the human auditory characteristics to achieve a low bit rate with minimum perceptual loss of audio signal quality. This thesis presents an enhanced MPEG-2 audio encoder using multiple TMS320C30 general purpose DSP's. The developed system is made up of five slave boards and one master board. Each slave board performs susband analysis psychoacoustic parameter calculation for one channel, and the master board manages bit allocation, quantization, and bit-stream formatting for all channels. Parallel processing and pipelining techniques are used in hardware structure and fast algorithms are applied in each subroutine to implement a real-time process. The implemented system supports multichannel up to 5.1 and various bitrates.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.356-359
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• 2011

최근 방송 시스템의 디지털화, 통신기술과 가전제품의 발전으로 스마트 TV 시대가 열리게 되었다. 이제 시청자들은 스마트 TV를 통해 기존의 디지털 방송과 IP(Internet Protocol) 통신이 융합한 하이브리드 방송 서비스가 가능해지면서 기존 방송망을 통한 실시간 콘텐츠 서비스와 더불어 IP망을 통한 VOD(Video on Demand) 서비스, 멀티뷰(Multi-view) 서비스의 이용이 가능하게 되었다. 그 중 멀티뷰 서비스는 시청자가 동일한 시간의 영상을 다양한 시점에서 동시에 볼 수 있는 서비스로서, 하이브리드 방송 환경 하에서 현 방송 규격인 MPEG-2 TS(Transport Stream) 콘텐츠와 IP망을 통해 전달되는 실시간/비실시간 콘텐츠가 멀티뷰 서비스가 이루어질 때 콘텐츠 간의 시간정보 규격이 서로 상이하여 동기화에 어려움이 있다. 따라서 본 논문에서 이종망을 기반으로 한 하이브리드 방송 환경내의 다시점 콘텐츠의 동기화 방안을 제안하고자 한다.

• Journal of Information Science Theory and Practice
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• v.5 no.1
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• pp.65-84
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• 2017

Three most popular information services, Periscope, Ustream, and YouNow, vicarious for all Social Live-Streaming Services (SLSSs), are investigated to analyze their streamers' motivations and the user-generated content. Additionally, we collected demographic data (gender and age). More than 7,500 streams by users from the U.S., Germany, and Japan were observed. Main streamer motivations on SLSSs are boredom, socializing, the need to reach a specific group, the need to communicate, and fun. Important content categories on all three SLSSs are chatting, sharing information, 24/7, and 'slice of life.' We were able to identify differences between users from the U.S., Germany, and Japan as well as between the users of Periscope, Ustream, and YouNow. The main motive to stream in the U.S. is to reach a specific group, while in Japan it is socializing, and in Germany boredom. The top content category for both, YouNow as well as Periscope, is to chat; on Ustream it is 24/7 (i.e., webcams).

• KSBB Journal
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• v.15 no.6
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• pp.578-583
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• 2000

Biofiltration has been identified as a promising method of odor, VOCs and air toxic removal from waste gas streams because of low capital and operating cost, low energy requirements and an absence of residual products requiring further treatment of disposal. Because biofiltration units are microbial systems in-corporationg microorganisms grown on a porous solid media like compost, peat, soil and mixtures of these materials, there is a need to study of the adsorptive behavior of these supports. The purpose of this study was to investigate the major parameters of adsorptive process. We adsorbed VOCs onto peats and bark, and examined the correlations between the interphase mass transfer coefficients and transfer units, at different stream flow rates, VOCs inlet concentrations and bed lengths.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.1 no.2
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• pp.128-137
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• 1989

Numerical solutions for two-dimensional, steady, free convection are presented for a cylinder filled with saturated porous media. An annulus is bounded by inner wall with constant heat flux and two adiabatic horizontal walls with outer wall isothermally cooled. Governing equations are numerically solved for the range of Aspect Ratio 1 to 20, Radius Ratio, 1 to 20, and Rayleigh number, 50 to $10^4$ by Finite Difference method utilizing upwind scheme. Results are presented in terms of stream lines and isotherms, temperature distributions and local Nusselt numbers at the heated wall. Average Nusselt numbers are also presented for the comparisons.