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이종배 대한전자공학회 2005 電子工學會論文誌 IE (Industry electronics) Vol.42 No.1
A new multiple description selective coding is proposed to overcome noisy channels. Our algorithm adopts an embedded coding scheme, in which subband coefficients are encoded one bit plane at a time using a non-adaptive arithmetic encoder. According to the importance ratio for each region, we code interest regions with more passes than background in order to reconstruct interest regions with higher quality. To overcome channel errors, we adopt multiple description scheme which adds controlled amounts of redundancy to the original data during the compression process. Proposed algorithm achieves better quality compared with other algorithms especially in the circumstances where very low bit rate coding is required and some regions are more important than other regions. 채널의 잡음 영향을 극복하기 위하여 새로운 멀티플 디스크립션 기법을 제안한다. 본 기법은 임베디드 부호화기법을 채택하고 있으며, 부대역 계수가 한번에 비트 플레인 단위로 부호화 되는데 이때 비적응적 산술부호화 방식을 사용한다. 각 영역의 중요도에 따라 관심영역을 부호화할 때, 다른 부분에 비해서 패스 횟수를 늘려서 부호화를 행함으로써 관심영역이 다른 부분에 비해서 고화질로 부호화되도록 한다. 또 채널 에러를 극복하기 위해서 부호화 과정에서 소스 데이터에 제어된 중복성을 허용하는 멀티플 디스크립션 기법을 채택한다. 본 방식은 고압축률을 지향하고, 특정한 영역이 다른 부분에 비해서 중요한 시스템의 경우에 보다 중요한 특성을 나타낸다.
마이크로파 ZST 세라믹을 이용한 Helical Antenna 개발
이종배,육영진,신호용,김형순,임종인,Lee, Jong-Bae,Yook, Young-Jin,Sin, Ho-Yong,Kim, Hyung-Sun,Im, Jong-In 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.4
In this study, helical antenna with microwave ZST ceramics was designed using finite element method and developed. Studied parameters are relative dielectric constant of the dielectric core and the width of the conduction metal band of the antenna. As shown in the results, the center frequency of the antenna was decreased as the dielectric constant increased. Also beam width of the antenna increased as both the dielectric constant and the conduction band width increased. Based on the designed optimal shape, the manufactured antenna has the good beam width at center frequency 1.58 GHz.
이종배,김성대 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.4
A selective coding scheme is proposed that describes a method for coding image sequences distinguishing bits between background and target region. The suggested method initially estimates global motion parameters and local motion vectors. Then segmentation is performed with a hierarchical clustering scheme and a quadtree algorithm in order to divide the processing image into the backgraound and target region. Finally image coding is done by assigning more bits to the target region and less bits to background so that the target region may be reconstructed with high quality. Simulations show that the suggested algorithm performs well especially in the circumstances where background changes and target regionis small enough compared with that of background.