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광원 방향에 대한 제한조건을 이용한 Photometric Stereo Calibration
정성철,원상철,Jeong, Seong-Cheol,Nguyen, Viet Hung,Won, Sang-Chul 대한임베디드공학회 2013 대한임베디드공학회논문지 Vol.8 No.2
This paper proposes one method on photometric stereo calibration using the constraint on light source directions in which the light sources have the unknown tilt and slant angles but the slant angles are the same. First, the constraint is analyzed based on the equation of linear ambiguity which leads to the conclusion that another constraint should be added to solve the calibration completely. Later, the combination of constraint on light source directions and the constraint that there exists at least six surface patches having known albedos is exploited to resolve the linear ambiguity up to an accurate and close-form solution. The effective performance of the proposed method is demonstrated through experiment results.
유전자조작, 균주분리 대한민국 대천 해안에서 분리한 전분 분해능을 갖는 Pseudoalteromonas sp. A-3 균주의 특징 및 동정
지원재 ( Won Jae Chi ),박다연 ( Da Yeon Park ),정성철 ( Sung Cheol Jeong ),장용근 ( Yong Keun Chang ),홍순광 ( Soon Kwang Hong ) 한국미생물생명공학회 2011 한국미생물·생명공학회지 Vol.39 No.4
Strain A-3, an amylase-producing bacteria, was isolated from coastal seawater near Daecheon in the Republic of Korea. It was seen to possess a single polar flagella and grow well, on ASW-YP agar plates, at temperatures of between 20-37℃. However, it grew more slowly at the temperatures of 15℃ and 40℃. Similarly, it was observed to grow abundantly, in an Artificial Sea Water-Yeast extract-Peptone (ASW-YP) liquid medium, in a pH range of 6-9, but not grow at pHs of 4-5 and a pH of 10. Strain A-3 was noted as being close to Pseudoalteromonas phenolica O-BC30T, Pseudoalteromonas luteoviolacea NCIMB1893T, Pseudoalteromonas rubra ATCC29570T, and Pseudoalteromonas byunsanensis FR1199T, with 98.30%, 97.86%, 97.78%, and 97.25% similarities respectively, in its 16S rRNA sequence. A phylogenetic tree revealed that strain A-3 and P. phenolica O-BC30T belong to a clade. However, strain A-3 differed from P. phenolica O-BC30T in relation to a number of physiological characteristics. Strain A-3 exhibited no growth above 5% NaCl concentrations, no utilization of D-glucose, D-mannose, D-maltose, or D-melibose, and no lipase (C-14) activity. All of these properties strongly indicate that strain A-3 is distant from P. phenolica O-BC30T and thus led us to name it Pseudoalteromonas sp. A-3. Pseudoalteromonas sp. A-3 produces α-amylase throughout growth. Maximal amylase activities of 144.48 U/mL and 149.20 U/mL were seen at pH 7.0 and 37℃, respectively. Pseudoalteromonas sp. A-3`s high, stable production of α-amylase in addition to its biochemical features, such as alkalitolerance, suggest that it is a good candidate for industrial applications.