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Cure Mechanism of DGEBA/MDA/SN System
심미자,김성욱,Shim, Mi-Ja,Kim, Seong-Uk Materials Research Society of Korea 1993 한국재료학회지 Vol.3 No.3
To modify the toughness of epoxy for matrix, succinonitrile(SN) was introduced to diglycidy1 ether of bisphenol-A (DGEBA)/methylene dianiline(MDA)system. Cure reaction mdchanism of the DGEBA/MDA/SN system was strdied through Fourier transform infrared(FT-IR) spectrometry. As a result, the reaction of nitrile group of SN with secondary amine and with hydroxy1 group prevented the reaction of hydroxy1 group with epoxide group from crossoinding. Nitrile groups produced amide group by reacting with hydroxy1 groups and made a lowered crosslind density in chain networks.
DGEBA - MDA - SN - Hydroxyl 계 복합재료의 제조 - DGEBA - MDA - SN - HQ 계의 경화반응 속도론 및 메카니즘 -
심미자,김상욱 ( Mi Ja Shim,Sang Wook Kim ) 한국공업화학회 1994 공업화학 Vol.5 No.3
DGEBA(diglycidyl ether of bisphenol A)/MDA(4, 4`-methylene dianiline)/SN(succinonitrile)/HQ(hydroquinone)계의 경화반응 속도론 및 메카니즘을 연구하였다. SN과 HQ는 반응성 첨가제와 촉매로 도입하였다. 경화반응 속도론은 DSC 분석에 의해 Kissinger equation과 fractional-life법을 이용하여 연구하였다. DGEBA/MDA/SN 계의 활성화 에너지와 반응차수는 SN의 함량에 관계없이 거의 일정하였고, 촉매로써 HQ가 첨가됨으로 인해 활성화 에너지와 반응시작 온도가 낮아졌다. 이들 계의 반응 메카니즘을 고찰하기 위하여 SN의 함량에 따라 FT-IR을 측정하였다. 그리고, SN : HQ의 혼합비는 4 : 1이었다. Diamine으로 경화되는 에폭시 수지의 경화반응 메카니즘은 primary amine-epoxy 반응, secondary amine-epoxy 반응, epoxy-hydroxyl 반응이 일어나는 것으로 알려져 있다. DGEBA/MDA/SN/HQ 계에서는 HQ의 hydroxyl 기가 epoxy 및 amine과 결합하여 전이상태를 형성하여 epoxide ring을 빠르게 개환시켜줌으로써 amine-epoxy 반응이 쉽게 일어남을 알았다. The effects of cure kinetics and mechanism of DGEBA(diglycidyl ether of bisphenol A)/MDA(4, 4`-methylene dianiline) with SN(succinonitrile) and HQ(hydroquinone) as an additive and accelerator were investigated. Cure kinetics was evaluated by Kissinger equation and fractional-life method through DSC analysis. The activation energy and reaction order of DGEBA/MDA/SN system were showed independent on SN content. But in the case of HQ which has hydroxyl group as an accelerator, the activation energy and the starting cure-temperature were lower than those of DGEBA/MDA/SN system. Cure mechanism of those systems was investigated through FT-IR according to the various SN contents. The ratio was SN : HQ = 4 : 1. It has been known that the cure reactions of an epoxy-diamine system are composed of primary amine-epoxy reaction, secondary amine-epoxy reaction and epoxy-hydroxyl group reaction. But in DGEBA/MDA/SN system, primary amine-CN group reaction and CN group-hydroxyl group reaction were added to the above mentioned reactions. These reactions attributed to the long main chain and the low crosslinking density. And in DGEBA/MDA/SN/HQ system, hydroxyl group of HQ formed a transition state with epoxide group and amine group and also opened the ring of the epoxide group rapidly, then amine-epoxy reaction took place easily.
심미자(Shim Mi-ja),김미향(Kim Mi-hyang) 한국인체미용예술학회 2005 한국인체미용예술학회지 Vol.6 No.1
This study is to examine how the hairstyle progressed in adopting the deconstrution of gender identity.<BR> The deconstrution of gender identity is the bounded text of J. Derrida"s deconstrution theory. He tried to dissolve the dichotomy of gender in nullifying the differences of gender, diffusing the truth and absolute value, finally dissolving the vision of gender. And he analyzed gender as feminization of men, masculinization of women, the third and the fourth genders.<BR> Masculinized hairstyle of women becomes in mode by adopting short cut with simple bob style of convenience against long hair, which was symbolized by men"s symbol of whiskers. Feminization of men"s hairstyle as represented similarity to women"s were an trial of searching for the equality against women by adopting long hair, accessory, pony tail and dyeing.<BR> The third gender was common one. It assumed that men and women had the potentiality of opposite gender. It was represented by a long-haired men keeping moustache in accentuating the manliness, and by short-cut women in makeup in expressing two genders.<BR> The fourth gender was called as cyborg, which expressed the revolutionary cybernetic hairstyle including extravagant materials such as aluminum, metal, stretch and vinyl with spatial color of metal or silver. Its hairstyle was represented by geometric line cut, dynamic motive, bang style imagining the universe, wire, aluminum and zipper for expressing the cold, dynamic and futurist images.<BR> The thoughts of deconstrution of gender identity enable us to escape from the fixed idea or absolute value in changing modern society and to present the creative and personal ideas in various ways, resulting in changes in hairstyle. Accordingly, the dissolution phenomenon represented in hairstyle is to be further studied.
예비교사의 교육정보화 능력 향상을 위한 e-티칭 포트폴리오 활용 방안
심미자 ( Mi Ja Shim ),설양환 ( Yang Hwan Sol ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2007 교육정보미디어연구 Vol.13 No.1
정보공학의 발달은 교사들에게 교육정보 활용 능력과 테크놀로지 스킬을 요구하고 있다. 이미 선진국 대학들은 현직 교사와 예비교사들의 전문성 신장과 정보화 능력 향상을 위해 다양한 프로그램을 개발, 운영하고 있으며 그 중 하나가 e-티칭 포트폴리오이다. 이 연구는 예비교사의 교육정보 활용 능력 향상을 위한 방법으로 e-티칭 포트폴리오를 개발하여 교육실습에 적용, 그 효과성을 알아보고 보다 효과적인 활용 방안을 제시하고자 하였다. e-티칭 포트폴리오의 개념과 유형, 개발 과정, 교사교육에서의 효과성 등을 알아보기 위하여 문헌 분석과 선행연구 고찰, 외국 대학의 활용 사례를 분석하였다. 연구대상은 교육실습생이며 e-티칭 포트폴리오를 공동 개발하여 교육실습에 적용, 설문조사와 인터뷰를 통하여 효과성을 분석하였다. 연구결과, e-티칭 포트폴리오는 예비교사들의 교육정보화 능력과 테크놀로지 스킬 향상에 도움이 되는 것으로 나타났다. 가장 흥미롭거나 도움이 되었던 내용으로는 동료들과 상호작용을 통해 협력학습의 기회와 정보를 공유함으로써 자신의 교육실습 활동을 성찰할 수 있는 기회를 가질 수 있다는 것이다. 전통적인 인쇄매체기반 실습록과 비교하여 e-티칭 포트폴리오의 장점은 다양한 수업자료 활용, 정보의 접근성과 보관성, 자료 축적 및 수정 작업의 편리성, 디지털 자료의 활용성, 다음 실습에 연속적으로 활용이 가능하다는 것이다. 반면, 단점으로는 컴퓨터 활용 능력이 부족한 학생들의 거부감, e-티칭 포트폴리오를 개발하고 활용하기 위한 장비 및 시설 구축이 필요한 것으로 나타났다. Due to the development of information technology, even teachers are being required to acquire technological skills and the ability to use educational information. At many universities in advanced countries, various programs are already being developed and carried out to enhance the information literacy of in-service teachers and student teachers, and refurbish their professionalism, and one such program is e-teaching portfolio. In this study, as a way of enhancing the student teachers` ability to use educational information, we asked student teachers to develop an e-teaching portfolio and apply it to student teaching in order to find out its effectiveness, and we aimed to present a more effective program of using e-teaching portfolios in the future. The results of research showed that first, e-teaching portfolios were shown to help enhance the student teachers` educational information literacy and technological skills, and aid them in their self-reflection. Second, what was most interesting was that they gave student teachers an opportunity to experience collaborative learning with their peers through the work of developing a portfolio together. Third, the most difficult was shown to be building the web site within a limited time, due to lack of prior-knowledge, and creatively developing it without any set design template. Fourth, e-teaching portfolios were shown to be better than traditional paper-based teaching journal in that their information and material sharing allowed more various teaching materials to be used. And they had information access, easy information sharing, convenience of material accumulation and editing work, allowed use of digital materials, convenience of storage and transfer, and the possibility of being used continuously in the following teaching practice.