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A Novel Method for Inserting an MPEG-2 TS into Ensemble in a DMB transmission system
이광순,이수인,Byungjun Bae,Young Kwon Hahm 한국전자통신연구원 2004 ETRI Journal Vol.26 No.6
This paper presents an effective algorithm for inserting an MPEG-2 transport stream (TS) into a Digital Audio Broadcasting (DAB) ensemble without any bandwidth waste in a Digital Multimedia Broadcasting (DMB) transmission system. The key technologies of this algorithm include packet rate control and program clock reference correction, which are important for TS processing. The proposed algorithms are applied to the various DMB transmission systems based on Eureka-147, and the performance of the proposed algorithm is confirmed through the experimental DMB broadcasting. This paper presents an effective algorithm for inserting an MPEG-2 transport stream (TS) into a Digital Audio Broadcasting (DAB) ensemble without any bandwidth waste in a Digital Multimedia Broadcasting (DMB) transmission system. The key technologies of this algorithm include packet rate control and program clock reference correction, which are important for TS processing. The proposed algorithms are applied to the various DMB transmission systems based on Eureka-147, and the performance of the proposed algorithm is confirmed through the experimental DMB broadcasting.
플리커 저감 디스플레이 시스템 설계를 위한 인광체 잔광 특성의 정량적 해석
權容大(Yong-Dae Kwon),崔德圭(Duk-Kyu Choi),韓纘豪(Chan-Ho Han),李光淳(Gwang-Soon Lee),金銀洙(Eun-Su Kim),李相勳(Sang-Hoon Lee),宋奎翼(Kyu-Ik Sohng) 大韓電子工學會 2000 電子工學會論文誌-SP (Signal processing) Vol.37 No.6
최근 컴퓨터의 급속한 보급에 따라 고밀도 CRT(cathode ray tube)가 요망되고 있다. 이를 위하여 신호 대역과 주사 속도의 증가에 따론 주사선 수를 증가 시켜야 하고 플리커(flicker)도 줄여야 한다. 플리커 현상은 PC작업을 장시간 하는 경우 더욱 심하게 느켜지므로, 플리커 현상을 줄이는 연구가 필요하다. 본 논문에서는 플리커가 덜 느껴지도록 하는 디스플레이 시스템의 설계를 위한 기초 연구로서, CRT에 사용된 인광체의 잔광 특성 및 화면의 밝기에 따른 플리커와 프레임 주파수와의 관계를 정량적으로 해석하였으며, 또한 디스플레이 전화면에 대해서 시각을 고려하여 플리커를 덜 느끼도록 하는 프레임 주파수를 제시하였다. The perception of flicker on the computer display devices depends upon the temporal waveform of the phosphor decay characteristic, the frame rate, and the display size. The lowest frequency at which flicker is not perceived is called the critical fusion frequency or critical frequency. Critical fusion frequency is evaluated by the display illuminance and the modulation (m) defined as the ratio of the amplitude of first harmonic frequency to the DC of the waveform. In this paper, we analyze the relationship between the critical fusion frequency, relating to the decay characteristic of the phosphors and luminance on the monitor, and the frame frequency. Also under considering the viewing angle, we presented the frame frequency that is less sensitive to the full size of the display device.
권오정(O Jung Kwon),황일영(Il Young Hwang),이광순(Kwang Soon Lee) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
A cost-saving feeding rate control method for a batch reaction process is proposed by reconfigu -rating the flow rate control loop where the feeding rate is estimated by differentiating weight measurement. While the existing control methods require either a flow rate measurement device or a flow rate estimator, the proposed method is devised not to require neither of these facilities by directly controlling the tank weight with a time-varying set point. Experimental evaluation in a pilot-scale unit shows that the proposed method can significantly reduce the actuator hunting of the existing method where the flow rate is estimated by differentiating the weight measurement.