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임응찬,한인웅,이승준,박재호,조방현,서형수,정구용,한기원,김진원,임상규,이재윤 三陟大學校 1996 論文集 Vol.29 No.2
By impproving the educational program of the Department of Architectural Engineering and studying the theory of learning and the applied method necessary for the development of nation and society, we should develop a satisfying course of education to meet the demand and skill in the industralized society for the purpose of cultivating men of baility with great personalities and creative minds. Therefore, this study focused on classifying several kinds of occupations in the prart of architectured related to what graduates from the department of Architectural Engineering go with into the society. Accordingly after choosing some works adequate to each occupation by the proposed curricula, we tried to establish the scope of education and courses corresponding to the jobs and thus and develop a satisfying curriculum.
金鎭源,鄭求用,林應贊,林相奎,李在允 三陟大學校 1995 論文集 Vol.28 No.1
To serve the objectives of Architectural Design Course, that is, to develop professional worker our country and society keenly need, this study was carried out as a program to ensure the special domain of vocational educational institution. To carry out such and education, a practical curriculum should be developed and according to it education should be effectively accomplished so that students could find it easy to seek for work on leaving school, and that they could make progress their field.
PHOTOCHEMICAL REACTIONS OF PSEUDOSACCHARIN 3-ALLYL ETHER (PROBENAZOLE) AND ITS ALKYL ETHER
Yoon, Ung-Chan Korean Society of Photoscience 1995 Journal of Photosciences Vol.2 No.2
Photoreactions of pseudosaccharin ethers have been investigated. Pseudosaccharin 3-allyl ether undergoes a facile photoreaction via reaction pathways involving homolysis of bond between pseudosaccharyl oxygen and 3-allyl carbon, and excited nucleophilic substitution of allyloxy group by solvent which are not quenched by oxygen present in the reaction. Product yield demonstrates that the homolysis pathway predominates over the nucleophilic substitution in ca. 7:1 ratio. In contrast, pseudosaccharin alkyl ethers follow different reaction routes to produce two products, solvent-substituted pseudosaccharin alkyl ethers and reduction products, 3-alkoxy-1, 2-benzisothiazoles. The formations of reduction products, 3-alkoxy-1, 2-benzisothiazoles are completely quenched by oxygen.
Atmospheric Ozone Concentrations in the Industrial and Traffic Areas of Pusan City
Yoon,Ung Chan,Yun,Il,Kim,Jack C.,Kim,Jong-myung,Kim,Min-sook 부산대학교 환경문제연구소 1984 環境硏究報 Vol.2 No.-
부산 시청, 연산동, 감전동, 부산진구 및 명륜동 등의 5개지역에서 Ozone분석기를 이용하여 대기 중의 오존 농도를 측정한 수치는 다음과 같다(괄호 안은 최대치). 0.014(0.062), 0.031(0.230), 0.041(0.121), 0.021(0.081) 및 0.023ppm(0.091ppm). 가장 낮은 0.014ppm의 부산 시청 주위 농도는 인접한 바다 바람에 의한 희석 때문이라고 생각되며, 공업지역의 감전동의 0.041ppm은 대기중의 배기가스에 기인된 것이라 사료된다. 5개 지역의 오존 최대치가 미국의 기준치(0.08ppm) 및 일본의 0.06ppm을 초과하는 농도이다. 인간의 보건, 식물 및 유기고분자에 미치는 영향을 평가하였다.
The investigation of photochemical reaction of phototoxic antimalarial compounds
Yoon, Ung-Chan,Epling, Gary-A. The Pharmaceutical Society of Korea 1980 Archives of Pharmacal Research Vol.3 No.2
The goal of this research is to provide information that will lead to the development of new non-phototoxic antimalarial compounds. The goal was approached by first learning the chemical mechanism of phototoxicity of six representative compounds 1a-f: a[(diethyl-, -dihexyl-, and -dioctyl- aminomethyl)]-2-(3', 4' -dichlorophenyl)-6-methoxy-4-quinolinemethanol (1a, 1b, and 1c) and .alpha. [(diethyl-, -dibutyl-, and -dihexyl-aminomethyl)]-2-(-4'-methoxyphenyl-6-methoxy-7-chloro-4-quinolinemethan ol (1d, 1e, and 1f). The photochemical reaction of these compounds was investigated in 2-propanol. Similar photochemical fragmentation reactions accurred in all compounds.
Dipole-Forming Photochemical Group Transfer Reactions of Phthalimides and ${\alpha}-Ketoamides$
Yoon, Ung-Chan,Mariano Patrick S. Korean Society of Photoscience 2005 Journal of Photosciences Vol.12 No.3
Results of studies of SET-promoted dipole-forming photochemical group transfer reactions of phthalimide and ${\alpha}-ketoamide$ derivatives are discussed. Azomethine ylide forming photochemical reactions, which are initiated by intramolecular SET from tethered silylmethyl-, carboxymethyl-, and ${\beta}-hydroxyethyl$ containing electron donors to excited states of phthalimides, related maleimides, and conjugated imides, are presented first. Following this, investigations of regioselective 1,4-dipole forming photochemical reactions of N-trialkylsilylmethyl- and N-trialkylstannyl-${\alpha}$-ketoamides are described.
Exploratory Study of Photocyclization Reactions of N-(Trimethylsilylmethylthioalkyl)phthalimides
Ung Chan Yoon,Sang Jin Lee,Kyung Ja Lee,Sung Ju Cho,Chan Woo Lee,Patrick S. Mariano Korean Chemical Society 1994 Bulletin of the Korean Chemical Society Vol.15 No.2
Studies have been conducted to explore single electron transfer (SET) induced photocyclization reactions of N-(trimethylsilylmethylthioalkyl)phthalimides (alkyl=ethyl, n-propyl, n-butyl, n-pentyl, and n-hexyl). Photocyclizations occur in methanol in modest to high yields to produce cyclized products in which phthalimide carbonyl carbon is bonded to the carbon of side chain in place of the trimethylsilyl group. Mechanism for these photocyclizations involving intramolecular SET from sulfur in the ${\alpha}$-silylmethylthioalkyl groups to the singlet excited state phthalimide moieties followed by desilylation of the intermediate ${\alpha}$ -silylmethylthio cation radicals and cyclization by radical coupling is proposed. In contrast, photoreactions of N-(trimethylsilylmethylthioalkyl)phthalimides in acetone follow different reaction routes to produce another cyclized products in which carbon-carbon bond formation takes place between the phthalimide carbonyl carbon and the carbon ${\alpha}$ to silicon and sulfur atoms via triplet carbonyl hydrogen abstraction pathway. The normal singlet SET pathway dominates this triplet process for photoreactions of these substances in methanol while the triplet process dominates the singlet SET pathway for those in acetone. The efficient and regioselective cyclization reactions observed for photolyses in methanol represent synthetically useful processes for construction of medium and large ring heterocyclic compounds.
Ung Chan Yoon,Young Sim Koh,Hyun Jin Kim,Dong Yoon Jung,Dong Uk Kim,Sung Ju Cho,Sang Jin Lee Korean Chemical Society 1994 Bulletin of the Korean Chemical Society Vol.15 No.9
Photochemical reactions of saccharin with tertiary amines were explored. Saccharin was found to undergo an acid-base reaction with N-trimethylsilylmethyl-N,N-diethyl amine to form N-trimethylsilylmethyl-N,N-diethyl ammonium saccharin salt which is in equilibrium with free saccharin and N-trimethylsilylmethyl-N,N-diethyl amine insolution. Photoreaction of N-trimethylsilylmethyl-N,N-diethyl ammonium saccharin in $CH_3OH\;or\;CH_3CN$ results in the generation of desilylmethylated product, N,N-diethyl ammonium saccharin mainly along with benzamide. Photoreaction of N-methylsaccharin with N-trimethylsilylmethyl-N,N-diethyl amine in $CH_3OH$ leads to the production of o-(N-methylcarbamoyl)-N-ethylbenzenesulfonamid e as the major product along with N-methylbenzamide as the minor product. On the other hand, photoreaction of N,N,N-triethyl ammonium saccharin, generated from saccharin and triethylamine, produces N-methylbenzamide as the exclusive product. These photoreactions are quenched by oxygen indicating that triplets of saccharin and N-methylsaccharin are the reactive excited states. Based on the consideration of the redox potentials of saccharin and N-trimethylsilylmethyl-N,N-diethyl amine, and the nature of photoproducts, pathways involving initial triplet state single electron transfer are proposed for photoreactions of the saccharins with the ${\alpha}$-silylamine.
Electron transfer-induced photochemical reactions in imide-rxch2tms systems.
Yoon, Ung-Chan,Kim, Hyun-Jin,Patrick S. Mariano 부산대학교 기초과학연구소 1989 부산대학교 기초과학연구소 연구논문집 Vol.9 No.-
Studies have been conducted to explore single electron transfer (SET) induced photoaddition reactions of phthalimides with the α-silyl-n-electron donors (EtOCH2TMS, n- prSCH2TMS and Et2NCH2TMS). photoadditions of EtOCH2TMS, n-prSCHTMS and Et2NCH2TMS to phthalimides in CH3CN or CH3OH occur in moderate to high yields to produce 3-substituted phthalimidines. The primary photoadducts undergo dehydration (or desilanolation) to generate 3-alkylidenylphthalimidine derivatives by pathways which are accelerated by acid impurity. Mechnisms for these photoadditions involving SET from α-silyl- n-electron donors to excited phthalimides followed by selective desilylation of the intermediate cation redicals and radical coupling are proposed.