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이성교 국제기독교언어문화연구원 1999 기독교언어문화논집 Vol.3 No.-
Dr. Sung Kyo Lee. 1999. Linguistic Variation in Poetry. Collected Papers on Christian Language Culture. A good poet is said to be an expert in using words. In this respect, the relationship between poetry and language is to be researched for. In the differences between poetic diction and general language, how they are expressed on the surface is to be searched for. And this paper aims at examining the linguistic characteristics as well as the remarkable property of poetry. For the concrete examination of the characteristics between poetry and language will help those who want to be a good poet in their creating writings. Based on these arguements, this paper makes an introductory remark in chapter 1. In chapter 2, the relationship between a general language and a poetic diction is argued. And, in chapter 2 poetic expression and the language is argued. The arguments on poetic characteristics and the language in chapter 3 can be seen to clarify the problems in emotional language, poetic diction and rhythm, and also poetic diction and ambiguity. (Emeritus Professor of Sung-sin Woman's University)
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아크릴로니트릴의 첨가가 불포화폴리에스테르 수지의 물성에 미치는 영향
이기중,윤성길,인교진 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-
불포화 폴리에스테르 수지의 조성을 변화시키며 시편을 제작하고, 그 물성 변화를 검토하였다. 이러한 시편에 대하여 인장강도, 굴곡강도, 압축강도 등의 기계적 물성을 측정하였다. 불포화 폴리에스테롤 수지는 폴리에스테르 수지 32%, 모노머 68%의 비율로 제조하였다. 경화용 모노머로는 스티렌과 아크릴로니트릴을 함께 사용하였다. 모노머로써 아크릴로니트릴이 소량 첨가되면 경화 수지의 투명도가 개선되며, 그 함량이 증대되면 노란색이 진하여 지었다. 또한 스티렌 모노머를 단독으로 사용하여 중합한 불포화폴리에스테르 수지보다 아크릴로니트릴을 함께 사용하여 제조한 수지의 기계적 물성이 크게 향상됨을 확인하였다. 이는 아크릴로니트릴의 첨가에 의해 분자간 응집력이 향상되고, 상용성이 증대되었기 때문인 것으로 고찰되었다. Physical properties of unsaturateed polyester resins were tested by changing the components of the resins. Mechanical properties such as tensile strength, flexual strength, compressive strength was tested. The ratio of the polyester and monomer in the resin is 32wt.% and 68wt.%. Mechanical properties were measured by changing the composition of the styrene and acrylonitrile co-monomers. Transparency of the cured resin was improved erastically by adding small amount of acrylonitrile. Color of the resins became yellowish by increasing the ratio of acrylonitrile in the monomer components. The unsaturated polyester resins prepared by increasing acrylonitrile in the monomer components. The unsaturated polyester resins prepared by increasing acrylonitrile composition showed significant enhancement of mechanical properties rather than the resins prepared with styrene as a monomer. This fact might be attributed to strong cohesive energy of the polyacrylonitrile molecular units and good compatibility with polyester molecules.
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핸드오프로 인한 TCP 재전송 타이머의 타임아웃 방지 방안
이상연,임행빈,정충교 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-
It will be occurred unacceptably long pause and intermittent disconnection states due to handoffs under the mobile computing environment. The current TCP interprets these handoffs as network congestion and excutes the congestion avoidance algorithms which degrade TCP performance. To prevent degrading TCP troughtput due to the unnecessary timeout problem of source retransmitter timer caused by handoffs, we propose EHN(explicit handoff notification) message algorithm which resets the value of retansmission timer. By adapting EHN, the TCP source can maintain the pre-handoff' congestion window size after handoffs and prevent the abrupt decrease of congestion window size caused by timeout. Therefore, this scheme improves the TCP performance more than the current TCP implementations during handoffs. With the computer simulation, we compare our EHN scheme with the current TCP scheme and fast retransmission scheme and prove the validation of EHN.
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가교 폴리스티렌 입자가 불포화 폴리에스테르 수지의 수축저감에 미치는 효과
이기중,이상영,인교진 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-
본 연구에서는 불포화 폴리에스테르 수지의 수축저감제의 용도로 가교 폴리스티렌 입자를 제조하고, 불포화 폴리에스테르의 부피죽소에 미치는 영향 및 그 물성을 연구하였다. 가교 폴리스티렌 입자의 가교체로서 divinylbenzene을 사용하였으며, 스티렌 모노머에 대하여 0wt%, 1wt%, 3wt%의 비율로 첨가한 후 유화중합방법으로 입자를 제조하였다. ASTM 규격을 응용한 linear shrinkage method를 이용하여 길이변화율 및 부피수축율을 측정하였다. 수축저감효과는 1wt%의 가교체를 사용하여 제조한 폴리스티렌 입자가 가장 우수하였으며, 가교제가 3wt%함유된 입자의 경우 1wt%에 비해 수축저감 효과가 낮게 나타났다. 또한 수축저감 메카니즘을 규명하기 위하여 SEM, TEM을 이용하여 구조물성을 보았다. The objective of this study is to investigate the effects of low profile agents(LPAs) on volume shrinkage of unsaturated polyester(UP) resins. The properties of UP resins containing LPAs is also studied. Emulsion polymerization was performed to synthesis cross-linked PS particles that contain 0, 1, 3 wt% divinylbenzene as a cross-linking agent. Length change and volume shrinkage of the cured resin was measured by linear shrinkage method after small modification of ASTM D2566-86 standard. Three types of LPAs e.g., solution type LPA, particle type commercial LPA, and particle type LPA prepared in this study were used. the mixtures of UP resin with each LPA were transferred into a mold and cured at 150℃ for 3 minutes in a hot press. the UP resins containing particle type LPA with 1wt% cross-linking agent showed the best anti-shrinkage effect in this study. However, anti-shrinkage effect of the UP resins decreased when the content of cross-linking agent in LPA increased to 3wt%. This effect was related with the diffusion ability of solvent molecules into the particles. And Morphology of the cured UP resins was investigated by SEM and TEM. Microvoids and phase separation morphology that are with anti-shrinkage effect were observed in the electron micrographs.
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高等學校 化學科 探究學習의 評價模型 定立과 評價紙 開發
李相協,吳岱燮,呂煥鎭,이병교 경북대학교 과학교육연구소 1983 科學敎育硏究誌 Vol.7 No.-
The current evaluation method of high school chemistry has been emphasized on knowledge. This fact does not satisfy the objective of learning due to lackness of the evaluation method about its inquiry ability and attitude. Therefore we introduce a evaluation model and its items about knowledge, inquiry ability and attitude in order to approach the objective of learning in hiph school chemistry. First, in order to evaluate knowledge of the students, we used the computer Managed Instruction (C.M.I) method which presents a stepwise knowledge of students. Second, for the evaluation of inquiry ability and attitude, we prepared the evaluation items about the contents of chemistry experiment according to an analysis of the objective learning. Thus we applied them to the students in a high school.
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