• 항공우주기술
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• 제1권1호
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• pp.177-187
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• 2002

본 논문에서는 위성탑재용 고해상도 카메라 광학부의 예비설계 내용을 소개하고 차기 위성탑재체 개발에 필요한 기술적 제안사항을 수록하였다. 위성탑재용 고해상도 전자광학카메라 개발을 위한 광학 설계로서, 685㎞ 고도에서 지상 해상도 5m 성능을 가진 카세그레인 응용 Catadioptric 설계와 Unobscured Reflective Triplet 설계를 각각 수행, 그 spot diagram 및 MTF 등을 분석하였으며 이를 제작하는데 필요한 재질과 궤도상 운용조건까지 고려하여 실제 개발에 충분한 성능을 가진 광학설계 임을 입증하였다. 또한 차세대 위성탑재용 분광영상카메라(Hyperspectral Imager) 개발을 위하여 HSI Development Model을 설계하고 제작하였는데 그 설계 내용을 본 논문에 수록하였다. Off-axis 2-mirror 체계인 Telescope 부분과 Collimator-Grating-Reimaging lens cell로 이루어진 항우연 HSI DM의 광학 설계를 소개하고, 약 25%에 이르는 MTF성능을 포함한 설계부터 성능특성까지 주요기술사항을 기록하였다.

• 한국광학회:학술대회논문집
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• 한국광학회 2004년도 하계학술발표회
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• pp.42-43
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• 2004

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 하계학술발표회
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• pp.206-207
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• 2001

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 하계학술발표회
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• pp.210-211
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• 2001

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.3178-3182
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• 2007

The interferometer method with nano-scale spatial resolution has been developed in this study. To enhance the accuracy of the previous developed method, the 14 bit cooled CCD camera with 1280 by 980 spatial resolution was applied to the measurement. And optical alignment has been carried out on the highly accurate position sensors with 500nm resolution so as to be able to calibrate the detected interference image with the field of view. Also the measurements were applied to the ultra thin oil film between the Al coated cylinder mirror with 38.1mm radius and 0.5mm cover glass to verify the developed method. The measured result showed the good agreement with the used cylinder curvature with ${\pm}$5.18run uncertainty.

• Journal of Microbiology and Biotechnology
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• 제11권2호
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• pp.217-221
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• 2001

Pseudomonas sp. PA09 was isolated from farm soil and used for the optical resolution of D-pipecolic acid from DL-popecolic acid. The strain PA09 consumed L-pipecolic acid preferentially as the sole carbon and energy source, thus accumulating D-pipecolic acid in the culture broth. Optimization to improve the enantiomeric excess and yield was performed. The time course experiment showed that the strain OP09 consumed L-pipecolic acid almost to completion after 35h of cultivation, and the enantiomeric excess and the yield (% of residual D-pipecolic acid) were 99.8 and 96.0%, respectively.

• 한국통신학회논문지
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• 제29권12A호
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• pp.1285-1290
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• 2004

본 논문에서는 광 버스트 네트워크 내의 버스트 충돌을 해결하기 위한 새로운 알고리즘을 제안하였다. 제안된 알고리즘은 파장 변환(conversion), 경로 변경(deflection), 분리(segmentation), 광섬유 버퍼링을 흔합하여 광 스위치에 적용한 것이다. 제안된 충돌 해결 알고리즘의 성능은 ns(network simulator)-2를 이용하여 분석하였다. 시뮬레이션에 사용한 네트워크 토폴로지는 한국의 기간망을 가정하였고 이를 기반으로 다양한 네트워크 트래픽 조건에서 성능 지표(버림 확률, 전파 지연)의 개선을 보였다.

• 한국응용과학기술학회지
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• 제7권1호
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• pp.107-114
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• 1990

Optical resolution of aminoalcohols had been achived efficiently by use of (R)-2,2'-dihydroxy-l,1'-binaphtholphosphoric acid as the resolving agent in various organic solvents. Racemic aminoalcohols were resolved very easily and high enantiomer yield (about 70% e,e) in THF. On the other hand, absolute configuration of resolved aminoalcohol was (R)-configuration but one of the Valinnol and Phhenylglycinol was anti-type because of sterichindrance.Optical resolution of aminoalcohols had been achived efficiently by use of (R)-2,2'-dihydroxy-1,1'-binaphtholphosphoric acid as the resolving agent in various organic solvents. Racemic aminoalcohols were resolved very easily and high enantiomer yield (about 70% e,e) in THF. On the other hand, absolute configuration of resolved aminoalcohol was (R)-configuration but one of the Valinnol and Phhenylglycinol was anti-type because of sterichindrance.

• 대한전자공학회논문지
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• 제16권4호
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• pp.27-31
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• 1979

두개의 광전 transducer array를 나란히 1/2 화소만큼 어긋나게 배치하여서 거기에서 얻어진 신호들로 부터 해상도가 2배높은 transducer의 성능을 얻는 방식이 제안, 그리고 실험되었다. 높은 해상도의 입장에서 보아 2개의 화소의 평균치들로 신호를 내어주는 이 transducer 둘로부터 고신호의 추정은 마이크로컴퓨터 -로 행하였다.

• Bulletin of the Korean Chemical Society
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• 제10권6호
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• pp.491-495
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• 1989

Resolution of enantiomers of DNS-amino acids has been achieved by a reversed phase liquid chromatography with an addition of a copper(Ⅱ) complex of N-benzyl-L-hydroxyproline to the mobile phase. N-Benzyl-L-hydroxyproline was prepared and used as a chiral ligand of copper(Ⅱ) chelate for the optical resolution. The pH and the concentration of copper(Ⅱ) chelate, organic solvent, and buffer agent in the mobile phase all affect the optical resolutions of dansyl amino acids. The elution orders between D and L-DNS-amino acids were different depending on the structure of the side chain of the amino acids. The retention mechanism for the chiral separation of the dansyl amino acids can be illustrated by the equilibrium of ligand exchange and by hydrophobic interaction with $C_{18}$ stationary phase. The chiral separation can be illustrated with cis and trans effect of the ligand exchange reaction.