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Metal Oxide Sensor Array를 이용한 사과와 귤의 신선도 분석
임향주,한도수,조성동,김기윤 조선대학교 기초과학연구소 2000 自然科學硏究 Vol.23 No.1
The Electronic Nose has been designed to provide objective and reproducible aroma discrimination on a wide variety to human nose. The sensor array in combination with sophisticated chemometrics and artificial neural network software provides the output displaying the closeness of difference in aroma patterns of different samples. As an application the system has been used to discriminate of the fresh and decomposing apples and oranges. The discrimination has been successfully demonstrated.
Metal Oxide Sensor를 이용한 알코올 분석
林香住,姜東求,韓道洙,趙成棟 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.2
A resistance value of the metal oxide sensor for alcohols was measured by metal oxide senor (FOX2000). T30/1 sensor showed the best response to propanols. The pattern analysis could be measured to ppm and resistance could be processed as various forms. We could find that six sensor responses for propanols were better than those of methanol, when alcohols were displayed at the same time on the radar axis plane with maximum value of △R/Ro by sensors. Alcohols and distilled water were analysed with a principle component and they could be confirmed as being separated clearly.
Asymmetric Reduction of Ketone with Borane Reagent Catalyzed by Chiral Oxazaborolidine(BDPHMP)
Lim, Hyang-Ju,Han, Do-Soo,Kim, Gi-Youn,Kang, Dong-Ku,Kim, Doo-Hwa,Cho, Sung-Dong 조선대학교 기초과학연구소 1998 自然科學硏究 Vol.21 No.1
The asymmetric reduction of aromatic ketones with boron hydride reagents complexed with chiral oxazaborolidine (BDPHMP) prepared from the reaction of (S)-(-)-2-(diphenylhydroxymethyl)pyrrolidine and borane has been investigated in order to characterize the role of boron hydride reagent in asymmetric induction. The boron hydride reagents applied in this reduction are thexylborane (ThxBH_2) as a representative alkylborane and monobromoborane (H_2BBr) as a representative haloborane. The reduction of acetophenone yields 1-phenylethanol in 63.8%ee by ThxBH_2-BDPHMP system with the consistent R-configuration. On the other hand, the reduction of acetophenone yields 1-phenylethanol in 79.3%ee by H_2BBr-BDPHMP system with the consistent R-configuration. Reduction of simple aromatic ketones, acetophenone yields 1-phenylethanol in with R-configuration 63.8%ee by ThxBH_2-BDPHMP. On the other hand, the inducibility achieved by H_2BBr appears to the higher than that achieved by ThxBH_2. Thus, the enantiomeric excess of the alcohol produced in the reaction of acetophenone was 79.3%ee, with the consistenct R-configuration. The asymmetric inducibilitis are in the order of H_2BBR > ThxBH_2. Consequently, the higher steric hindrance of ThxBH_2 and BH_2Br than that of BH_3 seems to inhibit the coordination of these boranes to oxazaborolidine to result in the lower asymmetric induction.
Lithium disiamylethoxyborohydride 의 합성 및 반응
김선일,조성동,임향주 한국공업화학회 2000 응용화학 Vol.4 No.2
The lithium disiamylethoxyborohydride (LSEBH) were characterized by hydride analyses. t-Buthyllithium with disiamylethoxyborane possessing steric requirements has been synthesized. This reaction occurs rapidly, even at -78℃. Lithium disiamylethoxyborohydride (LSEBH) completely reduces the acetophenone to corresponding alcohol in 99% yield.
김선일,조성동,임향주 한국공업화학회 1999 응용화학 Vol.3 No.2
Organosilyl ammonium borohydride(2_) was synthesized via route of sol-gel process of organosilyl ammonium chloride(1_), The mole ratio of 1/1/4/2/1.O×10^(-2) of 3-chloropropyltriethoxysilane/dimethyldodecylamine/H₂O/THF/HCl(cat) was proved as an optimal condition on the synthesis of organsilyl quarternary ammonium chloride. In borohydration reaction of organosilyl quarternary ammonium chloride, the prduction of organosilyl quarternary ammonium borohydride was identified by B-H stretching vibrations of 2371, 2320, 2274 cm^(-1) on a vibrational spectroscopy. As a result, the intent of RH_4^- was found to be 2.0 mmol per one gram of organosilyl quarternary ammonium borohydride.