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페놀수지 및 에틸렌 글리콜을 첨가한 유리질 카본 코팅층의 물성 제어
주상현,주영준,이혁준,심영진,박동진,조광연,Joo, Sang Hyun,Joo, Young Jun,Lee, Hyuk Jun,Sim, Young Jin,Park, Dong Jin,Cho, Kwang Youn 한국결정성장학회 2022 한국결정성장학회지 Vol.32 No.3
In this study, glassy carbon coating was performed on the graphite using a phenolic resin and a curing agent was mixed with ethylene glycol as an additive to form the uniform surface. The phenolic resin was dried and cured under the environments of hot air, then converted into a glassy carbon layer by pyrolysis at 500~1,500℃. FTIR, XRD, SEM analysis, and density/porosity/contact angle measurement were performed for characterization of glassy carbon. The pyrolysis temperature for high-quality glassy carbon was optimized to be about 1,000℃. As the content of the additive increased, the effect of reducing surface defects on the coated surface, reduction of porosity, increase of contact angle, and increase of density were investigated in this study. The method of forming a glassy carbon coating layer through an additive is expected to be applicable to graphite coating and other fields.
강지훈(Ji Hoon Kang),박석천(Seok Cheon Park),김운하(Wun Ha Kim),심영진(Young Jin Sim),고성제(Sung Jea Ko),김덕진(Duck Jin Kim) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2B
기존의 공중전기 통신망들이 B-ISDN으로 통합, 발전되어 가는 과정에서는 경제성 및 효율성 등의 이유로 인해 필연적으로 기존망과 새로 구현하려는 망사이의 연동과정이 필요하게 되며 가능한 기존망의 기능을 수용하면서 구현될 수 있는 방안이 마련되어야 한다. 본 논문에서는 B-ISDN과 PSPDN의 망간 프로토콜인 B-ISUP와 X.75의 연동 프로토콜을 페트리네트(petrinet)의 변형인 프레디키트(predicate)/액션(action) 네트를 이용하여 모델링하였다. 또한 모델링 결과의 동작성 확인을 위해 도달트리(reachability tree)를 이용하여 교착상태(deadlock) 없이 프로토콜이 수행됨을 보였다.
이봉환(Lee Bong Hwan),박문호(Park Moon Ho),이하욱(Lee Ha Wook),주기호(Joo Gi Ho),이찬도(Lee Chan Do),이남준(Lee Nam Jun),심영진(Sim Young Jin) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.5
This paper presents a multimedia mail system which can transmit and receive multimedia mailing messages on Internet. This mail system is an extension of the existing e-mail system for multimedia data including text, image, MPEG video, and binary data. The MIME(Multipurpose Internet Mail Extension) format, which is an extension of RFC-822 mail format, is used to represent multimedia data, and SMTP(Simple Mail Transfer Protocol) is utilized as a mail transport protocol. The IMAP(Internet Mail Access Protocol), which provides more functions than the widely used POP(Post Office Protocol), is used as a mailbox retrieval protocol. The mail client is implemented on a multimedia PC while the server is implemented on a UNIX system. In the mail system, a mail sending program allows a user to attach binary file such as Postscript file and MPEG compressed video, while a receiving program provides direct interface to application programs to play back received multimedia mail messages.