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A complexity scalable H.264 decoder with downsizing capability for mobile devices
Nam, Hyeong-Min,Jeong, Jae-Yun,Byun, Keun-Yung,Kim, Jong-Ok,Ko, Sung-Jea IEEE 2010 IEEE transactions on consumer electronics Vol.56 No.2
<P>It is significantly challenging to playback H.264 compressed video in real time on mobile devices with limited computing power. In this paper, we propose a complexity scalable H.264/AVC decoding algorithm with a downsizing capability, which can offer the complexity scalability by directly decoding the compressed video at a downsized resolution. In the proposed method, the predicted and residual signal can be generated in a downsized resolution by modifying the motion compensation (MC) and the inverse discrete cosine transform (IDCT). As a result, the computational decoding load can be significantly reduced. Moreover, the proposed H.264 decoder can achieve the complexity scalability by adaptively discarding (or simplifying) redundant computations which have larger complexity but less effect on the video quality. Experimental results show that the decoding complexity can be reduced up to 43%, as compared to the conventional H.264/AVC decoder, while maintaining the acceptable video quality.</P>
Evidence of whole genome duplication in Panax ginseng draft sequence
Nam-Hoon Kim,Woojong Jang,Murukarthick Jayakodi,Sang-Choon Lee,Yun Sun Lee,Junki Lee,Beom-Soon Choi,Tae-Jin Yang 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
The generation and analysis of genomic resources information are essential to understand genomic features of crops. Even though medicinal component and its effect of Panax ginseng was well studied, the genomic study has been recently started. The ginseng genome has been known to undergo two rounds of whole genome duplication (WGD), therefore we investigated an evidence of WGD in ginseng draft sequence for understanding current ginseng genome structure. Four paralogous gene-rich genome blocks were found, consisted by eight scaffolds, using about 3.0 Gb whole genome draft sequence and 48,821 unigenes of P. ginseng generated by whole genome shotgun sequencing. The eight scaffold sequences were ordered and connected into four genomic blocks, using zig-zag extension within scaffold sequences recently duplicated. The paralogous scaffold pairs that were recently duplicated showed high sequence conservation in genic and non-genic regions. However, paleo duplicated paralogue scaffold sequences showed little conservation only in genic regions. Finally, a total of 110 paralogous gene pairs and its expression were identified from recently and paleo duplicated scaffold pairs, which were co-linear among four genomic blocks. This study provides the first insight into duplicated genome structure of ginseng and will be a valuable information for further ginseng genomics including improvement of draft sequence quality, chromosome anchoring of scaffolds, and genetic mapping.
Field emission behavior of boron nitride nanotubes
Yun, Ki Nam,Lee, Sang Heon,Han, Jun Soo,Song, Yoon-Ho,Lee, Cheol Jin IOP 2018 Nanotechnology Vol.29 No.8
<P>The field emission properties of boron nitride nanotube (BNNT) field emitters according to vacuum pressure were demonstrated. During the short-term emission operation, the field emission behaviors were almost similar, regardless of the vacuum pressure, even though the turn-on electric field of the BNNT field emitter was slightly increased as the vacuum pressure increased. On the other hand, during the long-term emission operation, both the degradation and fluctuations of the emission current of the BNNT field emitters were dramatically increased as the vacuum pressure increased. The degradation of field emission properties of the BNNT emitters according to vacuum pressure is mainly attributed to the ion bombardment effect, rather than the oxidation effect. The field emission behavior under Ar ambient also strongly demonstrates that the degradation and the fluctuation of the emission current are largely dependent on the ion bombardment effect.</P>