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A Novel Transcoding Technique between EVRC and G.729A for Mobile Multimedia Devices
Goo-Rak Kwon,Ji-Min Chung,Sang-Jae Nam,Sung-Jea Ko IEEE 2007 IEEE transactions on consumer electronics Vol.53 No.3
<P>In this paper, we propose a novel transcoding technique between enhanced variable rate codec (EVRC) and G.729A for mobile multimedia devices. The simplest way to communicate between heterogeneous speech networks is the cascade connection of two different codecs, called tandem coding. However, tandem coding not only has high computational loads, but also makes long delay. These problems can be solved by the effective transcoding algorithm using line spectral pair (LSP) and pitch delay conversion in speech codec. The proposed algorithm consists of LSP conversion, pitch delay conversion and algorithm for delay reduction. Experimental results show the proposed algorithm has lower computational complexity, shorter algorithm delay, and similar speech quality in comparison of the tandem algorithm.</P>
Noise-Robust Modulation Identification Method for Adaptive Receiver Based on Software Defined Radio
Goo-Rak Kwon,June-Sok Lee,Jae-Do Jin,Sung-Jea Ko IEEE 2007 IEEE transactions on consumer electronics Vol.53 No.3
<P>In this paper, we propose an effective noise- robust modulation identification algorithm for adaptive receiver based on software defined radio. The proposed method can estimate the carrier frequency, symbol rate, and modulation scheme of the received signal without the use of the handshaking process requiring supplementary information such as the training sequence. Experimental results show that the proposed algorithm demodulates the signal with a low probability of error at the noisy channel conditions.</P>
Archvillin C-Terminus-Binding Proteins in Human Skeletal Muscle
Goo-rak Chang 대한의생명과학회 2010 Biomedical Science Letters Vol.16 No.4
Archivillin, a muscle-specific isoform of supervillin, is a component of the costameric cytoskeleton of muscle cells. The purpose of this study was to determine which protein in the skeletal muscle collaborates with archvillin C-terminus. For this purpose, a yeast two-hybrid screening of human skeletal muscle cDNA library was performed using the C-terminal region of archvillin as bait. This study shows that seven human skeletal muscle proteins, namely, nebulin, xeplin, archvillin, GAPDH, TOX4, PITRM1, and YME1L1 interact with archvillin C-terminus. Especially, xeplin is a newly discovered protein interacts with archvillin C-terminus. These results indicate that archvillin C-terminus acts as a bridge between nebulin and xeplin at costameres. Archvillin C-terminal region interacts with nebulin C-terminal region at Z-discs and interacts with xeplin at the vicinity of sarcolemma. I propose that these interactions may contribute to formation of costameric structure and muscle contraction.
Digital Rights Management of A/V Codec for Mobile Devices
Goo-Rak Kwon 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Traditional cryptographic algorithms / systems for data security are often not fast enough to process the vast amount of data generated by the multimedia applications to meet the real-time constraints. In this paper, we propose a new encryption method for digital rights managements of multimedia contents for mobile multimedia devices. For the audio copyright, the magnitude and phase information of modified discrete cosine transform coefficients is encrypted. Transformed coefficients and motion vectors are used for the encryption of video copyright. Experimental results show that the proposed method can achieve very low cost of the encryption. Moreover, the processing overhead is usually negligible, compared to compression / decompression.
An efficient POCS-based post-processing technique using wavelet transform in HDTV
Kwon, Goo-Rak,Kim, Hyo-Kak,Kim, Yoon,Ko, Sung-Jea IEEE 2005 IEEE transactions on consumer electronics Vol.51 No.4
In this paper, we propose a new post-processing method, based on the theory of the projection onto convex sets (POCS) to reduce the in digital high definition television (HDTV) decoded images. We propose a new smoothness constraint set (SCS) and its projection operator in the wavelet transform (WT) domain to remove unnecessary high-frequency components caused by blocking artifacts. We also propose a new method to find and preserve the original high frequency components of the image edge. Experimental results show that the proposed method can not only achieve a significantly enhanced subjective quality, but also exhibit the PSNR improvement in the output image.
권구락(Goo-Rak Kwon),박일철(Il-Chul Park),김경훈(Koung-Hoon Kim) 한국멀티미디어학회 2009 한국멀티미디어학회 학술발표논문집 Vol.2009 No.1
본 논문에서는 비디오 트랜스코딩을 위한 빠른 DCT 영역에서의 다운샘블링 기법을 제안한다. 실험 결과을 통하여 제안된 알고리듬은 영상화질에서 효과적인 향상과 낮은 복잡도의 성능을 보여준다.
Kwon, Goo-Rak,Haoming, Zou,Park, Sei-Seung The Korea Institute of Information and Commucation 2010 Journal of information and communication convergen Vol.8 No.2
In this paper we propose the CBIR algorithm which is based on a novel image block method that combined both color and edge feature. The main drawback of global histogram representation is dependent of the color without spatial or shape information, a new image block method that divided the image to 8 related blocks which contained more information of the image is utilized to extract image feature. Based on these 8 blocks, histogram equalization and edge detection techniques are also used for image retrieval. The experimental results show that the proposed image block method has better ability of characterizing the image contents than traditional block method and can perform the retrieval system efficiently.