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장동춘,Chang Dong-Choon 한국도서관·정보학회 1999 한국도서관정보학회지 Vol.30 No.1
With the advancement of internet technology, traditional university libraries are going through metamorphosis into digital libraries. Digital libraries substitute digital files for printed materials, metadata for catalogues, world wide users on the network for localized patrons, while offering limitless possibilities for easy downloading of information. The aim of the study is to present a model for our digital library based on the knowledge auquired from the analysis of the state of the art technology employed in building and managing digital libraries and the management of large quantity of SGML electronic documents. This paper is our belief that the national information infrastructure for university digital libraries are mandatory for an open information society. 종래의 전통적 대학도서관은 인터넷 기술의 발달로 인하여 새로운 형태의 디지털 라이브러리로 변모하고 있다. 인쇄자료는 국제교환표준문서 표준 디지털 파일로 목록은 메타데이터로 이용자는 네트워크가 접속되는 전세계 이용자로, 자료는 무한정 복사가 가능한 형태로 바뀌고 있다. 국가 정보 하부구조를 위한 대학도서관 디지털 라이브러리 구축은 미래 정보화사회에 매우 중요한 것으로 본 논문에서는 기존의 디지털 라이브러리 기술에 대한 분석을 통하여 기하급수적으로 발생하는 전자문서를 관리하는 문제, ISO에서 문서 교환표준으로 제정한 SGML 문서의 구조 둥 앞으로 추진할 디지털 라이브러리의 모습을 모델링한다.
장승현,장동춘,정광보 大邱大學校附設 基礎科學硏究所 2001 基礎科學硏究 Vol.18 No.2
We report herein synthetic results obtained two bis-benzocrown ethers containing imine group. The first asymmetrical bis crown ether 1 is aminobenzo-18-crown-5-ether linked with the formlybenzo-15-crown-5 ether by imine reaction. The other symmetrical bis crown ether 2 is formlybenzo- 15-crown-5-ether linked with amonobenzo- 15-crown-6-ether also by imine reaction. 4'-Nitrobenzo-crown ethers and 3',4'-dinitrobenzo-crown ethers were prepared by nitration of benzo crown ethers, obtained from the reaction of catechol and oligoethylene glycol ditosylate. Crown ethers containing aldehyde group were synthesized from the reaction of 3,4- dihydroxybenzaldehyde and corresponding ditosylate respectively. The synthesized crown ethers were characterized respectively by IR, NMR. GC-Mass.
Coumarin을 포함하는 새로운 형광 크라운 에테르의 합성(Ⅱ)
이상훈(Sang-Hwoon Lee),장동춘(Dong-Chun Jang),장승현(Seung-Hyun Chang) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.2
We report herein synthetic results obtained new types of crown ethers containing coumarin group. Crown ethers containing coumarin group 1~3 are hydroxymethyl-15-crown-5-ether linked with 4-hydroxy coumarin-4-acetic acid by esterification reaction. Crown ethers containing coumarin group 1~3 have different cavity in each crown ether rings. The 12-crown-4 ether with coumarin 1 has the smallest cavity size. The 15-crown-5 ether with coumarine 2 has the medium cavity size. The 18-crown-6 ether with coumarin 3 has the largest cavity size. Therefore each crown ether with coumarin group will recognize different ionic radius meta. Because of different hole size in crown ethers, these crown ethers seem to be had different selectivity in luminescent sensors. The crown ethers with coumarine 1~3 synthesized hydroxymethyl-15-crown-5-ether and 4-hydroxy coumarin-4-acetic acid same ratio at one to one. The synthesized crown ethers were characterized respectively by IR, NMR. GC-Mass.
이상훈(Sang-Hwoon Lee),장동춘(Dong-Chun Jang),장승현(Seung-hyun Chang) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.1
We report herein synthetic results obtained six new types of bis-benzocrown ethers containing imine group. Bis crown ethers1~3 are aminobenzo-15-crown-5-ether linked with terephthalaldehyde, isophthalaldehyde, phthaldehyde respectively by imine reaction. Bis crown ethers1~3 are different distances in each crown ether rings. Bis crown ether 4 has large cavity in crown ethers. Functionalized crown ether 5 is synthesized amonobenzo-15-crown-5-ether and terephthaladehyde same ratio at one to one. Bis crown ether 6 has photosensitive linkage between crown ethers. Bis crown ether 7 is prepared by amonobenzo-15-crown-5-ether and triethyl ortho formate. 4'-Nitrobenzo-crown ethers and 3',4'-dinitrobenzo-crown ethers were prepared by nitration of benzo crown ethers, obtained fro the reaction of catechol and oligoethylene glycol ditosylate. Crown ethers containing aldehyde group were synthesized from the reaction of 3,4-dihydroxybenzaldehyde and corresponding ditosylate respectively. The synthesized crown ethers were characterized respectively by IR, NMR, GC-Mass.