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Modified Gattermann Reaction에 의한 2.6 Dihydroxybenzaldehyde의 合成
趙成棟,金瑄日 조선대학교 기초과학연구소 1981 自然科學硏究 Vol.4 No.1
2.6 dihydroxybenzaldehyde was synthesized from resorcinol by modified Gattermann reaction and their structure were studied. The absorption band of aromatic aldehyde, (1600-1640㎝^-1) and phenolic hydroxyl group (3150-3200㎝^-1) was detected by infrared spectrophotometer. The proton peaks of singlet aldehyde, (δ10.24) hydroxyl group (δ11.77, δ12.45) and aromatic group(δ6.80) were also identified by NMR spectrometer.
분산광선추적법을 이용한 Anti-Aliasing 랜더링 기법
조성동,윤경현 중앙대학교정보통신연구소 2001 정보통신연구소논문집 Vol.3 No.1
컴퓨터 그래픽스에서 3차원 물체의 명암(intensity)을 결정하는 랜더링 과정은 실세계 환경을 표현하는데 가장 중요한 부분이 된다. 래스터 스캔(raster-scan)이나 레이캐스팅(ray-casting)과 같은 일반적인 랜더링 기법들은 각 픽셀의 명암을 결정하기 위하여 1차원의 샘플(sample point)을 사용한다. 랜더링의 결과가 표현되는 스크린의 한 픽셀이 1차원의 점이 아니고, 논리적인 2차원 영역이기 때문에 이러한 접근방식은 반사(reflection), 부드러운 그림자(penumbra), 렌즈 효과(lens effect), 반투명 반사(gloss), 물체의 움직임(motion blur)과 같은 실세계의 현상을 표현하는데 한계를 가지고 있으며, 앨리어싱(aliasing) 현상을 나타낸다. sample point와 논리적 픽셀의 차원(dimension)의 차이 때문에 발생하는 앨리어싱 문제들을 확률 분포를 사용하여 해결하는 방식을 분산광선추적법(distributed ray tracing), 혹은 확률광선추적법(probability ray tracing)이라 한다. The process of determining the intensity of a 3D object, rendering process, is the most important aspect in Computer graphics for expressing the real-world environment. A one-dimensional sample point is used to determine the intensity of each pixel in the rendering methods such as raster-scanning or ray-casting. However, such method is limited in expressing the real-world properties such as the reflection, penumbra, lens effect, gloss and motion blur and shows an aliasing effect. The problem of the aliasing effect, caused by the difference in the dimension between the sample point and the logical pixel, can be resolved through the distributed ray tracing method or probability ray tracing method that uses stochastic distributing.
趙成棟 조선대학교 기초과학연구소 1986 自然科學硏究 Vol.9 No.1
광학 활성이 있는 올레핀 알데히드(3)를 염화제이주석 촉매를 써서, 고리화 반응을 시켜, 히드로아줄렌알코올(4)을 합성하였다. 또한 이 알코올의 입체화학 결정에 대해서도 논의 하였다. 올레핀 알데히드 (3)는 쉽게 구할 수 있는 (R)- (+)-리모닌 (6)을 출발물질로 하여 10단계를 거쳐 합성하였다. A hydroazulenic alcohol(4) was synthesized from stannic chloride-catalyzed cyclization of an optically active olefinic aldehyde(3), The olefinic aldehyde (3) was prepared from R-(+)-limonene(6) through a 10-step sequence. Stereochemical determination of the hydroazulenic alcohol(4) is also described.
Bis(triphenylphosphine) copper(1) tetrahydroborate에 의한 4-Bromophenyacetylchloride의 환원반응
조성동,김두화,박정환,김인경,조재흥 조선대학교 기초과학연구소 1991 自然科學硏究 Vol.14 No.1
4-Bromophenylacetylchroride was reduced to 4-bromophenylacetaldehyde in good yield by bis(triphenylhosphine) copper(1) tetrahydroborate.
(-)-Diisopinocampheylborane에 依한 1,2-Butylene Oxide의 選擇環境
趙成棟 조선대학교 기초과학연구소 1983 自然科學硏究 Vol.6 No.1
In order to investigate the asymmetric reductivity of the organic compounds (-)-Dilsopinocampheylborane was synthesized with borane and (+)-α-pinene. Having 2-Butanol been obtained from the reduction of (-)-Disopinocampheylborane with 1,2-Butylene oxide, the optical rotation of 2-Butanol was checked by using autodigital polarimeter. The results obtained are : 1) The dissolution of the borane gas in 250 ml of Tetrahydrofuran (THF) was 1.2047 mole H^-. 2) Two moles of (+)-α-pinene reacted with one mole of BH_3-THF to from one mole of (-)-Disopinocampheylborane. 3) The asymmetric reduction of Racemic 1,2-Butylene oxide (2 equivalent weight) with (-)-Disopinocampheylborane (1 equivalent weight) took place at higher rate, and the yield of R-(-)-2-Butanol was 74% at 0℃ and 760 mmHg. 〔α〕^25_D=-2.95 (neat) 21.8%, e.e. 4) One equivalent weight of 1,2-Butylene oxide remained unreacted was reduced with Lithium aluminum hydride to obtain 67% of S-(+)-2-Butanol at 0℃ and 760 mmHg. 〔α〕^25_D=+2.50 (neat) 18.8%, e.e.