• Kyungpook Mathematical Journal
• /
• 제54권3호
• /
• pp.425-441
• /
• 2014

In this paper, we first present the properties of the graph which maximize the spectral radius among all graphs with prescribed degree sequence. Using these results, we provide a somewhat simpler method to determine the unicyclic graph with maximum spectral radius among all unicyclic graphs with a given degree sequence. Moreover, we determine the bicyclic graph which has maximum spectral radius among all bicyclic graphs with a given degree sequence.

• Korean Journal of Mathematics
• /
• 제18권1호
• /
• pp.11-19
• /
• 2010

In this paper, several common fixed degree theorems of a sequence of fuzzy mappings defined on symmetric spaces are established.

• 한국콘텐츠학회논문지
• /
• 제13권10호
• /
• pp.160-169
• /
• 2013

타이틀시퀀스에서 활용된 물질은 영화의 스타일과 내용을 포괄적으로 내포하고 있다. 그러므로 어떤 물질을 선택하는가에 따라 정서적 표현의 효과가 달라질 수 있다. 이에 따라 최근 20년간의 영화 타이틀시퀀스 42편을 수집하여 소재를 분류하고 기호학사각형을 이용해 물질의 범주를 정의하였다. 물질도의 강약을 검증하기 위해 설문하여 3단계의 물질도를 구분하고 영화의 장르에 따라 어떤 범주의 물질성이 활용되었는지 조사하였다. 분석 결과 물질성은 장르의 구분 없이 내용에 따라 선택되었으나 물질도의 차이는 있었다. 강한 물질도는 스릴러와 SF.미스테리 장르에서 사용되었고, 중간 물질도는 전반적으로 활용되나 특히 드라마 장르와 액션에서 활용되었다. 약한 물질도 또한 다양한 장르에서 활용되었으나 특히 공포, SF 미스테리 장르에서 활용되었다. 본 논문은 영화를 상징적으로 시각화하는 타이틀시퀀스 제작에 있어 물질의 선택에 의한 표현 방법 연구를 제안하였다는데 의의가 있다.

• 한국정보처리학회논문지
• /
• 제7권5호
• /
• pp.1474-1481
• /
• 2000

The number of keystream cycle sequences has been proposed as a characteristic of binary sequence generator for cryptographic application, but in general the most of binary sequence generators have a single cycle. On the other hand, S-box has been used to block cipher for a highly nonlinear element and then we apply it to the stream cipher with a high crypto-degree. In this paper, we propose a multiple-cycle binary sequence generator based on S-box which has a high nonlinearity containing SAC property and analyze its period, linear complexity, randomness and the number of keystream cycle sequences.

• 대한수의학회지
• /
• 제42권1호
• /
• pp.89-100
• /
• 2002

The nonstructural glycoprotein NSP4, encoded by the 10th gene of rotavirus, has been known to play important roles in viral assembly and pathogenesis. The NSP4 genes of human rotavirus Korean isolates, designated as CBNU/HR-1, CBNU/HR-2, CBNU/HR-3, and CBNU/HR-4, were cloned, sequenced and characterized. Also, the NSP4 gene of the CBNU/HR-1 was expressed in a baculovirus-insect cell system. The sequence data indicated that the NSP4 genes of human rotavirus Korean isolates were 750 or 751 bases in length and encoded one open reading frame of 175 amino acids. Two glycosylation sites were recognized in the NSP4 gene of human rotavirus isolates tested. The NSP4 of CBNU/HR-1, CBNU/HR-3, and CBNU/HR-4 exhibited a high degree of amino acid sequence homology with that of NSP4 genotype B viruses, but a low degree of amino acid sequence homology with that of NSP4 genotype A viruses. However, the NSP4 of CBNU/HR-2 exhibited a high degree of amino acid sequence homology with that of NSP4 genotype A viruses, but a low degree of amino acid sequence homology with that of NSP4 genotype B viruses. The Sf9 cells infected with recombinant baculovirus, inserted with NSP4 gene of CBNU/HR-1, produced specific cytopathic effects and the expressed NSP4 was detected by immunofluorescence staining using NSP4-specific monoclonal antibody(MAb). The expressed NSP4 migrated at 16-26 kDa on SDS-PAGE and reacted with NSP4-specific MAb by Western blotting.

• 폴리머
• /
• 제24권5호
• /
• pp.664-672
• /
• 2000

Poly(ethylene naphthalate)/poly($\varepsilon$-caprolactone) (PEN/PCL)의 용융 블렌딩시 필연적으로 발현되는 상호에스테르 교환반응은 PEN/PCL 공중합체를 형성하게 된다. 블렌드의 조성비, 상호에스테르 교환반응 조건 그리고 사용된 촉매가 형성된 공중합체의 randomness와 평균 sequence length에 미치는 영향을 살펴보고 이들과 블렌드의 생분해 특성과의 관계를 확인하여 보았다. 용융 블렌딩에 의하여 얻어진 PEN/PCL 공중합체는 randomness가 0과 1사이인 것으로 보아 블럭 공중합체임을 알 수 있었으며, 열처리 시간과 온도의 증가 그리고 촉매의 첨가에 의하여 randomness가 1에 근접하고 PEN과 PCL의 평균 sequence length 모두 감소하는 것으로 보아 랜덤 공중합체로 변화됨을 확인할 수 있었다. 이러한 공중합체의 생성과 랜덤화는 PEN/PCL 블렌드의 생분해성 감소를 초래함을 알 수 있었다.

• Journal of Power Electronics
• /
• 제17권3호
• /
• pp.664-673
• /
• 2017

With the development of multilevel converters, cascaded single-phase H-bridge rectifiers (CHBRs) has become widely adopted in high-voltage high-power applications. In this study, sequence pulse modulation (SPM) is proposed for CHBRs. SPM is designed to balance the dc-link voltage and maintain the smooth changes of switch states. In contrast to phase disposition modulation, SPM balances the dc-link voltage even after removing the load of one submodule. The operation principle of SPM is deduced, and the unbalance degree of SPM is analyzed. All the proposed approaches are experimentally verified through a prototype of a four-module (nine-level) CHBR. Conclusions are drawn in accordance with the results of SPM and its imbalance degree analysis.

• Journal of the Korean Wood Science and Technology
• /
• 제25권2호
• /
• pp.100-109
• /
• 1997

The objectives of this study was to decrease pollutions of bleaching effluent and was to enhanced brightness of non-chlorine bleached pulps by xylanase treatments. Xylanase cloned Esherichacoli(E. coli) capable of each of endo, exo-xylanase and acetyl-esterase were obtained from Bacillus stearothermophillus. These xylanase was maintained high activity in alkali and high temperature. Especially endo-xylanase would be more active in $60^{\circ}C$ and pH 11. Xylanase pretreatment(X) of unbleached pulp increased brightness, and decreased the degree of delignification. The degree of increase in brightness of pulp due to xylanase pretreatment was similar to non-enzyme treated pulp, regardless of the amount of enzyme added. Therefore, the addition of xylanase of 2 unit was recommended when considering costs of enzyme. The pulp bleached XO sequence had higher brightness and lower Kappa no, than O bleached pulp, while pulp bleached XP sequence had similar brightness and Kappa no. with P bleached pulp. In XOC/D, XOZ and XOP bleaching sequences, brightness and degree of delignification were improved. The C/D and Z stage bleached pulp was good effect on rate of raise in brightness and Kappa no., but P stage bleached pulp had similar level in non-enzyme treated bleaching sequence.

• 대한바이러스학회지
• /
• 제30권1호
• /
• pp.1-10
• /
• 2000

The nonstructural protein NSP4, encoded by gene 10 of rotavirus, has been shown to playa role in viral assembly and known to be an enterotoxin, causing diarrhea in mouse pups. NSP4 gene was cloned from CBNU-2 (virulent bovine rotavirus/diarrheic fecal sample) and CBNU-1 (cell-culture adapted bovine rotavirus/isolated from CBNU-2 and 75 times passaged on MA104 cells), respectively, by reverse transcriptase-polymerase chain reaction (RT-PCR) and sequenced and compared. The sequence data indicated that the NSP4 genes of bovine rotavirus (BRV) were 751 bases in length and encoded one open reading frame of 175 amino acids beginning at base 42 and terminating at base 569. Differences in nucleotide sequence between CBNU-2 and CBNU-1 were observed at 6 positions (base 274, 296, 391, 394, 396 and 579). NSP4 gene of BRV exhibited a high degree of nucleotide (90% and 94%) and amino acid sequence (91% and 97%) homology with those of SA11 and UK but a low degree of nucleotide (77% and 79%) and amino acids sequence (81% and 85%) homology with those of Wa and OSU.

• 통합자연과학논문집
• /
• 제5권2호
• /
• pp.131-134
• /
• 2012

Bae and Kim displayed a sequence of 4th degree self-reciprocal polynomials whose maximal zeros are related in a very nice and far from obvious way. Kim showed that the auxiliary polynomials in their results are related to Chebyshev polynomials. In this paper, we study two sequences of polynomials satisfying the recurrence of the auxiliary polynomials with generalized initial conditions. We obtain same results with the auxiliary polynomials from a sequence, and some interesting conjectural properties about resultants and discriminants from another sequence.