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이상민(Sang-Min Lee),박철우(Cheal-Woo Park),이종항(Jong-Hang Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
An aspherical lens in information technology has been increased in order to enhance the optical performances. There are two kinds of approaches to machine the aspherical lens according to workpiece materials: Those are plastics and glasses. The direct machining technique of aspherical surface is generally conducted by the diamond turning machine, precision grinding machine, and polishing machine. This technique, however, has a problem which needs an expensive and high precision machine in order to increase the surface roughness and the machining accuracy. In this paper, a machine, which is able to machine the aspherical surface, was developed to decrease the cost. Also, the machining of the aspherical surface using a cone was carried out experimentally in order to compare the experiment with the simulation. The results showed that the machining experiments of the aspherical surface by using the tilted cone were in accordance with the simulation.
흥미로운 구조를 가진 Dipyrrolylbenzene들의 합성에 관한 연구
정대일,김인식,정두희,박철우,김윤영 東亞大學校 大學院 1996 大學院論文集 Vol.21 No.-
1-(2-Aminophenyl)pyrrole 20a and 1,2-dipyrrolylbenzene 17a were synthesized by using 1,2-phenylenediamine 16a with 2,5-dimethoxytetrahydrofuran 12 in glacial acid. 1-(3-Aminophenyl)pyrrole 20b and 1,3-dipyrrolylbenzene 17b were obtained by using 1,3-phenylenediamine 16b with 2,5-dimethoxytetrahydrofuran 12 in glacial acetic acid. 1,4-Dipyrrolybenzene 17c was synthesized by using 1,4-phenylenediamine 16c with 2,5-dimethoxytetrahydrofuran 12 in glacial acetic acid. Aminophenylpyrroles 20 and dipyrrolylbenzenes 17 were respectively synthesized by the treatment of 1,2-phenylenediamine 16a, 13-phenylenediamine 16b, 1,4-phenylenediamine 16c and 2,5-dimethoxytetrahydrofuran 12 in no solvent, acrylic acid, silica-gel, acrylic acid + silica-gel + acetic acid instead of glacial acetic acid. In case of silica-gel + acetic acid among various methods reactivity about synthesis of dipyrrolylbenzene 17 was best. 9-Phenylcarbazole 15 was synthesized by treatment of 1-phenylpyrrole 13 with 2,5-dimethoxytetrahydrofuran 12 in glacial acetic acid.
N-치환된 Nortropinone과 N-Phenylpyrrole들의 합성
박유미,이용균,정대일,김인식,박성욱,박철우,홍현주,김윤영 東亞大學校附設基礎科學硏究所 1996 基礎科學硏究論文集 Vol.13 No.1
여러 유기산 용매하에서 aniline la와 2,5-dimethoxytetrahydrofuran 2을 반응시켜 N-phenylpyrrole 10a을 각각 합성하였다. 여러 유기산 중에서 acetonedicarboxylic acid 8의 경우는, 25℃에서 다양한 amine 1과 2,5-dimethoxytetrahydrofuran 2을 반응시켜 N-치환된 nortropinone Ⅱ 유도체가 합성되었으며 N-phenylpyrrole 유도체 10도 합성되었다. The N-phenylpyrrole 10a was respectively synthesized by the treatment of aniline 1a with 2,5-dimethoxytetrahydrofuran 2 in various organic diacids. In case of acetonedicarboxylic acid 8 among various diacids, N-substituted nortropinones 11 was respectively synthesized by the treatment of various amines 1 with 2,5-dimethozytetrahydrofuran 2 at 25℃. And also N-phenylpyrroles 10 as minor products were synthesized.