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Seokbeom Hong,Hosung Park,Jong-Seon No,Helleseth, Tor,Young-Sik Kim IEEE 2014 IEEE transactions on information theory Vol.60 No.6
<P>In this paper, a new class of (N, K) near-optimal partial Hadamard codebooks is proposed. The construction of the proposed codebooks from Hadamard matrices is based on binary row selection sequences, which are generated by quadratic have parameters N = p<SUP>n</SUP> and K = (p - 1/2 p)(N + √N) + 1 for an odd prime p and an even positive integer n. We prove that the maximum magnitude of inner products between the code vectors of the proposed codebooks asymptotically achieves the Welch bound equality for sufficiently large p and derive their inner product distribution.</P>
보문 : 국내에 유통되는 종국 곰팡이의 분류학적 특성 및 안전성
홍승범 ( Seungbeom Hong ),홍성용 ( Sungyong Hong ),조규홍 ( Kyuhong Jo ),김영식 ( Youngsik Kim ),도종호 ( Jongho Do ),도지영 ( Jiyoung Do ),노석범 ( Seokbeom Noh ),윤한홍 ( Hanhong Yoon ),정수현 ( Soohyun Chung ) 한국균학회 2015 韓國菌學會誌 Vol.43 No.3
장류와 주류 제조를 위하여 국내에서 유통되는 하경발효의 황국균(HK1), 수원발효의 황국균(SW101), 백국균(SW201), 충무발효의 된장용 황국균(CF1001), 간장용 황국균(CF1002), 청주용 황국균(CF1003), 주류용 백국균(CF1005) 과 전통 메주에서 분리하여 산업화 준비를 하고 있는 황국균(KACC 93210)의 분류학적 특성과 안전성을 조사하였다. 공시한 6균주의 황국균은 모두 A. oryzae로 동정되었으며 이중 HK1, SW101, CF1001, CF1003은 분생포자를 생성하는 대(stipe)의 길이가 중간크기(711~1,121 μm, 中毛)로써 서로 유사한 형태적 및 분자계통학적 특성을 나타내었으나 청주용인 CF1003이 다른 3균주에 비하여 포자를 다소 적게 그리고 균사를 다소 많이 생성하였다. 간장제조용인 CF1002는 대의 길이가 평균 543 μm로서 짧았으며(短毛) omtA 유전자 분석에서 다른 황국균이 ICAo 그룹에 위치하는 반면에 IBLB- 그룹에 소속되어 명쾌히 구분되었다. 전통메주에서 분리되어 산업화 과정에 있는 황국균 KACC 93210 균주는 대(stipe)가 평균 270 μm로 매우 짧았으며 (超短毛) 다른 황국균이 양털모양의 집락을 형성하는 반면벨벳모양의 집락을 형성하여 형태적으로 쉽게 구분되었고 omtA 유전자에서도 공시한 황국균은 물론 세계적으로 보고된 어떤 황국균과도 염기서열이 서로 달랐다. 수원발효의 백국균(SW201)과 충무발효의 백국균(CF1005)은 모두A. luchuensis (또는 A. luchuensis mut. kawachii)로 동정되 었으며 집락 형태가 다소 상이하였으나 기타의 형태적 특징과 분자계통학적 특징에서 서로 구분되지 않았다. 황국균 6균주는 aflatoxin, cyclopiazonic acid, sterigmatocystin 의 곰팡이 독소를 생성하지 않았고 백국균(A. luchuensis)은 유해한 독소를 생성하지 않는 것으로 이미 보고되었으므로 국내에 유통되는 황국균과 백국균은 모두 곰팡이독소에서 안전한 곰팡이임이 입증되었다. We examined taxonomic characteristics and safety of eight Nuruk molds that are widely used for making soybean paste, soy sauce and alcoholic beverages in Korea. HK1 from Hakyeong Fermentation Co., SW101 from Suwon Fermentation Co., CF1001, CF1002, CF1003 from Chungmoo Fermaentation Co. and KACC 93210 are yellow-Nuruk molds, and SW201 from Suwon Fermentation Co. and CF1005 from Chungmoo Fermentation Co. are white-Nuruk molds. Six strains of yellow-Nuruk molds were identified as Aspergillus oryzae. HK1, SW101, CF1001 and CF1003 of yellow-Nuruk molds have middle length of stipes (711~1,121 μm), and CF1003 (for sake) produced less conidia and more hyphae than HK1, SW101 and CF1001 (for soybean paste). CF 1002 used for soy sauce has shorter stipes (543 μm) and is clustered into IBLB- group based on omtA gene analysis although the other yellow-Nuruk molds are clustered into ICAo group. KACC 93210 isolated from traditional Korean Meju has very short stipes (average 270 μm), and showed velvety colonies although the others showed floccose colonies. The strain has different DNA sequences of omtA gene from other strains in NCBI GenBank as well as strains used in Korea, suggesting that it is unique from other strains published. SW201 and CF1005 of white-Nuruk molds were identified as Aspergillus luchuensis or A. luchuensis mut. Kawachii that is known as safe, non-toxigenic fungus. The six strains of yellow-Nuruk molds did not produce mycotoxins including aflatoxin, cyclopiazonic acid, and sterigmatocystin. Therefore, eight strains of Nuruk molds used for making soy sauce, soybean paste and alcoholic beverages in Korea were proved to be safe in this study.
Design of Multiple-Edge Protographs for QC LDPC Codes Avoiding Short Inevitable Cycles
Hosung Park,Seokbeom Hong,Jong-Seon No,Dong-Joon Shin IEEE 2013 IEEE transactions on information theory Vol.59 No.7
<P>There have been lots of efforts on the construction of quasi-cyclic (QC) low-density parity-check (LDPC) codes with large girth. However, most of them focus on protographs with single edges and little research has been done for the construction of QC LDPC codes lifted from protographs with multiple (i.e., parallel) edges. Compared to single-edge protographs, multiple-edge protographs have benefits such that QC LDPC codes lifted from them can potentially have larger minimum Hamming distance. In this paper, all subgraph patterns of multiple-edge protographs, which prevent QC LDPC codes from having large girth by inducing inevitable cycles, are fully investigated based on a graph-theoretic approach. By using combinatorial designs, a systematic construction method of multiple-edge protographs is proposed for regular QC LDPC codes with girth at least 12 and another method is proposed for regular QC LDPC codes with girth at least 14. Moreover, a construction algorithm of QC LDPC codes based on certain liftings of multiple-edge protographs is proposed and it is shown that the resulting QC LDPC codes have larger upper bounds on the minimum Hamming distance than those lifted from single-edge protographs. Simulation results are provided to compare the performance of the proposed QC LDPC codes with progressive edge-growth (PEG) LDPC codes and with PEG QC LDPC codes.</P>