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Pooling-Based Intra Prediction Mode Coding for Mobile Video Applications
Bongsoo Jung,Hoyoung Lee,Kwanghyun Won,Byeungwoo Jeon IEEE 2011 IEEE transactions on broadcasting Vol.57 No.3
<P>The demand of real-time yet high quality video encoding for portable multimedia devices is increasingly strong. The state of the art H.264/AVC standard provides much higher coding efficiency than its predecessors. However, its high computational complexity of encoding is not suitable for battery-powered mobile devices. In this paper, we introduce a low complexity video encoding scheme based on new pooled macroblock modes mainly targeted for battery-operated portable devices. Since the motion prediction and intra prediction take most of the computation and thus battery consumption, restriction of prediction block sizes is essential in implementing a low complexity encoder. However, if this is not done carefully, it may result in unacceptable degradation of coding efficiency. The problem is overcome by developing new macroblock coding modes which are computationally trivial but effective in coding efficiency. Experimental results with several well-known video test sequences verify a far better performance of the proposed method against the standard H.264/AVC encoder operated in low-complexity configuration. Also we evaluate how less power consumption the proposed low complexity encoder actually consumes compared to that of the H.264/AVC baseline profile.</P>
PROMOTING EMPLOYMENT OF FOREIGN MIGRANT WORKERS - FOREIGN DOMESTIC WORKERS IN SINGAPORE -
( Bongsoo Jung ) 고려대학교 법학연구원 2016 Korea University Law Review Vol.20 No.-
People and products cross borders freely in the era of globalization, integrating all nations into one great market. Singaporeans have taken advantage of the supply of cheap foreign domestic workers. Through this, the city state has increased its competitiveness by making the most of its female manpower by keeping child-rearing expenses low while improving the quality of life. Koreans also need to take advantage of the supply of foreign domestic workers, as is done in Singapore, towards increasing the low birth rate and assisting highly-trained women to avoid giving up their careers to raise families. Singapore introduced its Foreign Domestic Servant Scheme (FDSC) in 1978 to bring in foreign domestic workers. There are three factors behind the FDSC`s success. First, there has been a greater supply of domestic workers from neighboring countries than demand for their services in Singapore. Second, it has been possible to maintain a secure supply for a long time through the strict immigration regulations that make it difficult for foreign domestic workers to work illegally. Third, Singapore`s indirect supervisory administration makes efforts to protect the human rights of these domestic workers and improve their working conditions.
B 슬라이스의 압축 효율 향상을 위한 개선된 양방향 대칭 예측 부호화 방법
정봉수(Bongsoo Jung),원광현(Kwanhyun Won),전병우(Byeungwoo Jeon) 한국방송·미디어공학회 2009 방송공학회논문지 Vol.14 No.1
A bi-directionaJ symmetric prediction technique has been developed to improve coding efticiency of B-slice and to reduce the computational complexity required to estimate two motion vectors. On the contrary to the conventional bi-directional mode which encodes both forward and backward motion vectors, it only encodes a single forward motion vector, and the missing backward motion vector is derived in a symmetric way from the forward motion vector using temporal distance between forward/backward reference frames to and from the current B picture. Since the backward motion vector is derived from the forward motion vector, it can halve the computational complexity for motion estimation, and also reduces motion vector data to encode. This technique always derives the backward motion vector from the forward motion vector, however, there are cases when the forward motion vector is better to be derived from the backward motion vector especially in scene changes. In this paper, we generalize the idea of the symmetric coding with forward motion vector coding, and propose a new symmetric coding with backward motion vector coding and adaptive selection between the conventional symmetric mode and the proposed symmetric mode based on rate-distortion optimization.
Lee, Hyo Sang,Song, Hyeng Gun,Jung, Hyeseung,Kim, Myung Hwa,Cho, Changsoon,Lee, Jung-Yong,Park, Sungnam,Son, Hae Jung,Yun, Hui-Jun,Kwon, Soon-Ki,Kim, Yun-Hi,Kim, BongSoo American Chemical Society 2016 Macromolecules Vol.49 No.20
<P>The photostability of donor-acceptor (D-A) polymers remains a critical issue despite recent improvements in the power conversion efficiencies (PCEs) of organic photovoltaic (OPV) cells. We report the synthesis of three highly photostable polymers (PDTBDT-BZ, PDTBDT-BZF, and PDTBDT-BZF(2)) and their suitability for use in high-performance OPV cells. Under 1 sunlight of illumination in air for 10 h, these polymer films demonstrated remarkably high photostability compared to that of PTB7, a representative polymer in the OPV field. While the PDTBDT-BZ, PDTBDT-BZF, and PDTBDT-BZF2 polymer films maintained 97, 90, and 96% photostability, respectively, a PTB7 film exhibited only 38% photo stability under the same conditions. We ascribed the high photostability of the polymers to both the intrinsically photostable chemical moieties and the dense packing of alkyl side chains and planar backbone polymer chains, which prevents oxygen diffusion into the PDTBDT-BZ films. This work demonstrates the high photostability of planar PDTBDT-BZ series polymers composed of photostable DTBDT and BZ moieties and suggests a design rule to synthesize highly photostable photovoltaic materials.</P>
Superconducting Junction of a Single-Crystalline Au Nanowire for an Ideal Josephson Device
Jung, Minkyung,Noh, Hyunho,Doh, Yong-Joo,Song, Woon,Chong, Yonuk,Choi, Mahn-Soo,Yoo, Youngdong,Seo, Kwanyong,Kim, Nam,Woo, Byung-Chill,Kim, Bongsoo,Kim, Jinhee American Chemical Society 2011 ACS NANO Vol.5 No.3
<P>We report on the fabrication and measurements of a superconducting junction of a single-crystalline Au nanowire, connected to Al electrodes. The current−voltage characteristic curve shows a clear supercurrent branch below the superconducting transition temperature of Al and quantized voltage plateaus on application of microwave radiation, as expected from Josephson relations. Highly transparent (0.95) contacts very close to an ideal limit of 1 are formed at the interface between the normal metal (Au) and the superconductor (Al). The very high transparency is ascribed to the single crystallinity of a Au nanowire and the formation of an oxide-free contact between Au and Al. The subgap structures of the differential conductance are well explained by coherent multiple Andreev reflections (MAR), the hallmark of mesoscopic Josephson junctions. These observations demonstrate that single crystalline Au nanowires can be employed to develop novel quantum devices utilizing coherent electrical transport.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-3/nn1035679/production/images/medium/nn-2010-035679_0005.gif'></P>
Park, Bongsoo,Park, Jongsun,Cheong, Kyeong-Chae,Choi, Jaeyoung,Jung, Kyongyong,Kim, Donghan,Lee, Yong-Hwan,Ward, Todd J.,O'Donnell, Kerry,Geiser, David M.,Kang, Seogchan Oxford University Press 2011 Nucleic acids research Vol.39 No.1
<P>The fungal genus <I>Fusarium</I> includes many plant and/or animal pathogenic species and produces diverse toxins. Although accurate species identification is critical for managing such threats, it is difficult to identify <I>Fusarium</I> morphologically. Fortunately, extensive molecular phylogenetic studies, founded on well-preserved culture collections, have established a robust foundation for <I>Fusarium</I> classification. Genomes of four <I>Fusarium</I> species have been published with more being currently sequenced. The Cyber infrastructure for <I>Fusarium</I> (CiF; http://www.fusariumdb.org/) was built to support archiving and utilization of rapidly increasing data and knowledge and consists of Fusarium-ID, Fusarium Comparative Genomics Platform (FCGP) and Fusarium Community Platform (FCP). The Fusarium-ID archives phylogenetic marker sequences from most known species along with information associated with characterized isolates and supports strain identification and phylogenetic analyses. The FCGP currently archives five genomes from four species. Besides supporting genome browsing and analysis, the FCGP presents computed characteristics of multiple gene families and functional groups. The Cart/Favorite function allows users to collect sequences from Fusarium-ID and the FCGP and analyze them later using multiple tools without requiring repeated copying-and-pasting of sequences. The FCP is designed to serve as an online community forum for sharing and preserving accumulated experience and knowledge to support future research and education.</P>