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타입 II 최적 정규기저를 갖는 유한체의 새로운 병렬곱셈 연산기
김창한,장상운,임종인,지성연,Kim Chang-Han,Jang Sang-Woon,Lim Jong-In,Ji Sung-Yeon 한국정보보호학회 2006 정보보호학회논문지 Vol.16 No.4
유한체의 H/W 구현에는 정규기저를 사용하는 것이 효과적이며, 특히 최적 정규기저를 갖는 유한체의 H/W구현이 가장 효율적이다. 타입 I 최적 정규기저를 갖는 유한체 GF($2^m$)은 m이 짝수이므로 암호학적으로 응용되지 못하는 단점이 있다. 그러나 타입 II 최적 정규기저를 갖는 유한체의 경우는 NIST에서 제안한 ECDSA의 권장 커브 중 GF($2^{233}$)위에 주어진 것이 있으며, 이 유한체가 타입 II 최적 정규기저를 갖는 등 여러 응용분야에 적용 되는바 효율적인 구현에 관한 연구가 활발하게 진행되고 있다. 본 논문에서는 타입 II 최적 정규기저를 갖는 유한체 GF($2^m$)의 연산을 정규기저로 표현하여 확대체 GF($2^{2m}$)의 원소로 나타내어 연산을 하는 새로운 병렬곱셈 연산기를 제안하였으며, 제안한 연산기는 기존의 가장 효율적인 결과들과 동일한 공간 및 시간 복잡도를 갖는 효율적인 연산기이다. In H/W implementation for the finite field, the use of normal basis has several advantages, especially, the optimal normal basis is the most efficient to H/W implementation in GF($2^m$). In this paper, we propose a new, simpler, parallel multiplier over GF($2^m$) having a type II optimal normal basis, which performs multiplication over GF($2^m$) in the extension field GF($2^{2m}$). The time and area complexity of the proposed multiplier is same as the best of known type II optimal normal basis parallel multiplier.
김창한,유익종,이강익 한국축산학회 1995 한국축산학회지 Vol.37 No.3
This study was carried out to investigate the optimum dilution ratio of liquid whole egg with distilled water for the efficient fermentation with lactic acid bacteria by determination of physico-chemical changes of fermented liquid egg. pH of all treatments(diluted by 1:1, 1:2. 1:3, 1:4) appeared lower than 4.5 after 8 hrs incubation, the pH was highest in 1:1 treatment. Titratable acidity of all treatments appeared higher than 0.45 after 8 hrs fermentation. Viscosity was highest in 1:1 treatment at initial incubation stage, and two samples(1:3, 1:4) showed similar tendency between them. Viscosity in all treatments increased by wide-scale after 4 hrs fermentation compared with those of initial incubation stage, increased slightly after 8 hrs fermentation. The order of viscosity degree after 8 hrs fermentation was 1:1, 1:2, 1:3, 1:4 treatments. Lactic acid bacteria count showed more than 10^8CFU/㎖ in every treatments at 4 hrs incubation and those of 1:3, 1:4 treatments decreased to the level of 10^7CFU/㎖ after 8 hrs incubation. The L values decreased when dilution rate increased, those of 8 hrs incubation become higher than those of initial incubation stage. b values decreased as dilution rate increased. There was no change in b value of each treatment during fermentation.
타입 k 가우시안 정규기저를 갖는 유한체의 병렬곱셈 연산기
김창한,김소선,장남수 대한전자공학회 2006 電子工學會論文誌-SD (Semiconductor and devices) Vol.43 No.1
In H/W implementation for the finite field, the use of normal basis has several advantages, especially, the optimal normal basis is the most efficient to H/W implementation in . In this paper, we propose a new, simpler, parallel multiplier over having a Gaussian normal basis of type k, which performs multiplication over in the extension field containing a type-I optimal normal basis. For k=2,4,6 the time and area complexity of the proposed multiplier is the same as tha of the best known Reyhani-Masoleh and Hasan multiplier[1][2]. 유한체의 H/W 구현에는 정규기저를 사용하는 것이 효과적이며, 특히 타입 I의 최적 정규기저를 갖는 유한체의 H/W 구현이 가장 효율적이다. 이를 이용하기 위하여 타입 (m,k) 인 가우스 주기를 갖는 유한체 중에서 를 만족하는 유한체 을 타입 I 최적 정규기저를 갖는 유한체인 의 부분체인 것을 이용한 새로운 병렬곱셈 연산기를 제안하였으며, 이러한 곱셈기는 암호학적으로 널리 응용되는 타입 k=2, 4, 6등의 경우에 기존에 알려진 가장 효율적인 Reyhani-Masoleh 과 Hasan[1][2] 의 연산기와 같은 복잡도를 갖는 효과적인 연산기이다
Antitumor Activity of Cell Suspension Culture of Green Tea Seed (Camellia sinensis L.)
김창한,백현동,김두환,홍승범,최재훈,Sang Kun Yoon,Keyong Ho Lee,Min Soo Seo,Ji-Yeon Kim 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.5
The objective of this study was to investigate the antitumor activity of suspension cultures of tea callus cells grown in the presence of different concentrations of the growth regulator 2,4-dichlorophenoxy acetic acid (2,4-D) with or without light irradiation. The methanol and ethanol extracts of precipitated cells (MEP, EEP) exhibited stronger inhibitory effects on the growth of tumor cell lines than the water extract of precipitated cells (WEP) or the supernatant. Compared to culture under dark conditions, exposure to light irradiation led to significantly higher antitumor activity. The MEP from light irradiated cells at 250 μg/mL with 2.0 mg/L 2,4-D displayed more than 64% growth inhibition of HEP-2 cells, whereas normal cells showed less than 25% growth inhibition. The some fractions of MEP obtained from Diaion HP-20 column chromatography displayed the majority of inhibitory activity against the HEP-2 cell line. These results show that 2,4-D, and light stimulated the synthesis of antitumor compounds.
Legendre Symbol에 관한 Conjecture와 그 응용
金昌漢 世明大學校 1992 世明論叢 Vol.2 No.-
We give a conjecture for Legendre Symbol and its applications of the factoring polynomials over the quadratic number fields.