• The Transactions of the Korean Institute of Electrical Engineers P
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• v.60 no.3
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• pp.161-166
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• 2011

In this paper, for analysing the major factors giving the effect to the quality of HD level video on the multicasting service, we tried this test experiment on the College school network similar to the real service network environment. We measure the video quality distortion on the multicasting HD level video according to generating and increasing the broadcasting traffic on the situation that apply the QoS technique to the test network and not apply the QoS technique and then find out the threshold value of network factors giving the effect to the video quality distortion on the multicasting HD level video service. This paper can be used for guaranteeing the constant video quality and reducing the video quality distortion on the multicasting HD level video service.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.713-718
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• 2007

본 논문에서는 실시간적인 요소와 높은 경험의 질을 요구하는 다자간 협업 환경에서 고해상도 비디오를 제공하기 위하여, 무손실과 저지연, 저비용의 특징을 갖는 비압축 HD 비디오를 처리할 수 있는 '비압축 HD 비디오 전송 응용' (Scalable Video Tool)을 구현하여 초고해상도 디스플레이를 위한 비압축 HD 가시화 서비스'를 구성한다. Scalable Video Tool (SVT)은 Microsoft 사의 Direct Show를 기반으로, 비압축 HD 카메라와 DV 카메라, WebCam의 영상도 실시간으로 처리가 가능하다. 초고해상도 디스플레이에 고해상도 비디오와 이미지 가시화를 지원하는 SAGE(Scalable adaptive graphics environment)[2]와 SVT를 연동하여 다자간 협업 환경에서 다양한 형태의 고해상도 비디오와 그래픽스 자료를 공유할 수 있는 시스템을 구성한다. 본 논문의 마지막에서는 $5{\times}11$의 격자 형태로 구성된 타일드 디스플레이 (Tiled Display)를 이용하여 제안된 시스템을 검증한다.

• Journal of Korea Multimedia Society
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• v.20 no.6
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• pp.853-864
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• 2017

HD padding area is essential redundancy in HD broadcasting. It is possible to use this padding area for the purpose of improving DTV broadcasting services. For utilization of this area, The bit of a service data was converted to black and white $8{\times}8$ block image. Converted block images are compressed with active video and are delivered to a receiver as only DC coefficients in a video stream. video quality is not effected by the proposed method, and service data was perfectly recovered in receiver without errors by using block average and threshold. The proposed utilization of HD essential padding area can possibly overcome the limited transmission stream rate with the bandwidth of HD broadcasting. If service data in transport or video stram were transferred using this padding area, it is possible to improve video quality with expanded video stream rate. Additionally, because the proposed methods are based on well-established standards, it is also useful for world-wide HD broadcasting systems such as ATSC, DVB, and IPTV.

• Journal of Digital Contents Society
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• v.10 no.3
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• pp.461-468
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• 2009

In a recent year, the broadcasting system has been changed from analogue to digital all over the world, not just in Korea, and Korea aims at accomplishing 100% digital broadcasting by 2013. The HD(High Definition) Video Format, which currently plays a key role in digital broadcasting system, has been gradually extended in the field of broadcasting and movie. Additionally, many kinds of camcoders and editing systems have been rapidly converted into the digital types, and they are supporting to photograph and video editing systems with the various types of image formats such as SD(Standard Definition) format, HD format, 2K, 4K, etc. Tape Video Storage System, which has been usually used in the stage of photographing by this day, is gradually evolving into Tapeless Video Data Storage System. Thus in this study, Video Compression method of HD format photographed by Sony PMW-EX3, one of major tapeless camcoders, is studied and also the way of applying it effectively in Avid Media Composer, a non-linear editing system, is discussed.

• The Journal of Korean Association of Computer Education
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• v.14 no.6
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• pp.83-89
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• 2011

In this study a smart HDMI switch is proposed to detect newly formed video stream and automatically change the transfer path to the corresponding port without pulling the HDMI plug and putting it again in the desired port manually and physically. Furthermore the proposed switch is designed in the advanced wireless video transmission scheme based on millimeter band technology. The proposed system shows its feasibility by the hardware experiment in the full-HD video transmission performance including the function of the smart port change.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.65 no.4
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• pp.326-334
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• 2016

In this paper for developing and implementing the realtime HD level video streaming transmitter which is operated on the multi-platform in all network and client environment compared to the exist video live streaming transmitter. We design the realtime HD level video streaming transmitter supporting the multi-platform using the TMS320DM386 video processor of T.I company and then porting the Linux kernel 2.6.29 and implementing the RTSP(Real Time Streaming Protocol)/RTP(Real Time Transport Protocol), HLS(Http Live Streaming), RTMP(Real Time Messaging Protocol) that can support the multi-platform of video stream protocol of the received equipments (smart phone, tablet PC, notebook etc.). For proving the performance of developed video streaming transmitter, we make the testing environment for testing the performance of streaming transmitter using the notebook, iPad, android Phone, and then analysis the received video in the client displayer. In this paper, we suggest the developed the Realtime HD(High Definition) level Video Streaming transmitter performance data values higher than the exist products.

• Broadcasting and Media Magazine
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• v.14 no.3
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• pp.36-46
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• 2009

비디오 서버는 대량의 영상과 음성 데이터를 보호화해서 디지털 포맷으로 저장하고 원하는 즉시 비디오 데이터를 재생 및 전송할 수 있는 컴퓨터 기반 장비를 말한다. 기존 저장 매체인 VTR(Video Tape Recorder) 테이프(Tape)에 녹화되던 영상은 비디오 서버의 HDD(Hard Disk Drive)에 파일로 저장되고 있다. 이러한 형태로 기존 VTR 이 수행하던 녹화, 편집, 송출 등의 역할을 비디오 서버가 파일 기반 제작 시스템으로 대체하고 있다. 즉 테이프리스(Tapeless) 제작환경의 촬영 단계인 녹화부터 송출 단계의 마지막 재생까지 사용되는 장비가 HD 비디오 서버이다. 파일 기반의 IT(Information technology) 제작환경은 제작 프로세스를 효율화하여 생산성을 향상시키고 비용을 절감하며 콘텐츠 재사용을 통한 미디어가치를 높인다. 이러한 장점들 때문에 비디오 서버 사용은 날로 증가되고 있다. 이에 본 논문에서는 비디오 서버 관련 기술에 대해 알아보고 자체 개발한 경험을 바탕으로 HD 비디오 서버 구현 기술을 소개하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.245-250
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• 2015

We have developed an optical video transmission device for HD-SDI signal transmission. The optical transmitter/receiver unit operates at DC 5 volt and small enough to be attaced near surveillance camera. They have internal voltage regulating circuits to supply 3.3V to other circuits inside the unit. The optical transmitter is composed of cable driver, laser diode driver, and laser diode. The optical receiver is composed of photodiode, limiting amp, and cable equalizer. The wavelength of the trasmitter was 1.3 um, and optical power was -5dBm, and the speed was 1.485Gbps. The receiver sensitivity was -23 dBm. We confirmed that the optical device can transmit HD-SDI video through 30 km optical fiber without any interruption.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.20-23
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• 2013

Recently for the transfer of large size video file between sites for high-definition craft editing used by broadcasting company the Public Network is used a lot. In the IP Public Network with QoS(Quality-of-Service) not guaranteed, degradation of performance has several causes. In this paper, we have analyzed the causes of low performance to transfer a large size HD video file in long distance, in order to maximize the effectiveness, the high efficiency network could be implemented enabling the highspeed of HD video file using the connection with networks between hosts through packet creation and multi-session of Parallel TCP. We survey the result of high speed transfer system and verify the efficient transfer method using Public IP Network for large HD video file transfer in broadcasting cooperation.

• ETRI Journal
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• v.37 no.6
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• pp.1096-1107
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• 2015

This paper presents a dynamic retry adaptation scheme for H.264 HD video, called DRAS.264, which dynamically adjusts the retry limits of frames at the medium access control (MAC) layer according to the impact those frames have on the streamed H.264 HD video. DRAS.264 is further improved with a bandwidth estimation technique, better prediction of packet delays, and expanded results covering multi-slice video. Our study is performed using the Open Evaluation Framework for Video Over Networks as a simulation environment for various congestion scenarios. Results show improvements in average peak signal-to-noise ratios of up to 4.45 dB for DRAS.264 in comparison to the default MAC layer operation. Furthermore, the ability of DRAS.264 to prioritize data of H.264 bitstreams reduces error propagation during video playback, leading to noticeable visual improvements.