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대기압 플라즈마 처리와 접착력 강화 : 고무 소재의 접착력 향상
심동현,설수덕 東亞大學校附設 生産技術硏究所 2007 生産技術硏究所硏究論文集 Vol.12 No.-
An atmospheric plasma pre-treatment method was applied to Rubber material to improve its contact angle and adhesion. In order to investigate the optimum reaction condition of plasma treatment, type of reaction gas (nitrogen, argon, oxygen, air), rate of gas flow (30~100mL/min), and reaction time(0~30sec) were examined in a plate plasma reactor. The result of the surface modification with respect to the treatment procedure was characterized by using SEM and ATR-FTIR. Due to a decrease of the contact angle of polyurethane foam, the greatest adhesion strength was achieved at a flow rate of 100 mL/min and at a reaction time of 10s for N2 gas. Consequently, the atmospheric plasma treatment reduced the contact angle of the Rubber material and also resulted in the improvement of the peel strength.
옥살산 공침법에 의한 Gd-Doped CeO<sub>2</sub> 분말의 합성 및 소결 특성
한인동,임광영,심수만,Han, In-Dong,Lim, Kwang-Young,Sim, Soo-Man 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.10
GDC20($Ce_{0.8}Gd_{0.2}O_{1.9}$) powder was synthesized by oxalate co-precipitation and milling and its thermal decomposition, phase formation, and sinterability were investigated. As-prepared precipitates were non-crystalline due to the milling process and completely decomposed at 400$^{\circ}C$ The powder calcined at 800$^{\circ}C$ for 2 h contained fine p]sty particles with an average size of 0.69 $\mu$m. Attrition milling of the calcined powder for 2 h had a little milling effect, resulting in a slight decrease in the particle size to 0.45 $\mu$m. The milled powder consisted of small spherical primary particles and some large particles, which had been agglomerated during calcination. Due to the excellent sinterability of the powder, sintering of the powder compacts for 4 h showed relative densities of 78.7% at 1000$^{\circ}C$ and 97.8% at 1300$^{\circ}C$, respectively. Densification was found to almost complete at temperature above 1200$^{\circ}C$ and a dense and homogeneous microstructure was obtained. A rapid grain growth occurred between 1200$^{\circ}C$ and 1300$^{\circ}C$. Grains in 0.1$\sim$0.5 $\mu$m sizes at 1200$^{\circ}C$ grew to 0.2$\sim$2 $\mu$m and their size distribution became broader at 1300$^{\circ}C$.
Tripledecker 착물, (CpCo)_2(C_4R_4)과 Alkyne과의 반응
嚴在國,李元植,金碩峯,車震淳,李炯秀,李東鎬,金洪碩,沈相喆 대구효성가톨릭대학교 자연과학연구소 1993 基礎科學硏究論集 Vol.1993 No.1
트리플데카 착물류, bis-(η^5-cyclopentadienyl)-μ-(η^4-1,2,3,4-tetraalkylcyclobutadiene)dicobalt들은 Jonas시약과 2-hexyne 또는 3-hexyne을 실온에서 동량으로 반응시킬때, 50% 이상의 최대 수율이 얻어졌다. 한 종류의 트리플데카 착물인 bis-(η^5-cyclopentadienyl)-μ-(η^4-1,2,3,4-tetraalkylcyclobutadiene)dicobalt(13)는 실온에서 3-hexyne과 반응시키면, 착물 (η^5-cyclopentadienyl)cobalt-acyclopentadiene-μ-(η^4-2,4-cobaltacyclope-ntadiene)(η^5-cyclopentadienyl)cobalt(15)로 이성화되었다. 다른 한 종류의 트리플데카 착물, bis-(η^5-cyclopentadienyl)-μ-(η^4-1,3-dimethyl-2,4-dipropyl-cyclobutadiene)dicobalt(14)를 2-hexyne 과 반응시켰더니 1,3,5-tri-methyl-2,4,6-tripropyl benzene화합물이 생성되었다. The tripledecker complexes, bis-(η^5-cyclopentadienyl)-μ-(η^4-1,2,3,4-tetraalkylcyclobutadiene)dicobalt were produced by the reaction of Jonas reagent with 2-hexyne and 3-hexyne in the maxi-mum yield(above 50%) when they were reacted in eq-molar amounts at room temperature. A tripledecker complexes,bis-(η^2-cyclopentadienyl)-μ-(η^4-1,2,3,4-tetraalkylcyclobutadiene)dicobalt(13) was isomerized to (η^5-cyclopentadienyl)cobalt-acyclopentadiene-μ-(η^4-2,4-cobaltacyclope-ntadiene)(η^5-cyclopentadienyl)cobalt(15) on reacting with 3-hexyne at room temperature. Another tripledecker complex, bis-(η^5-cyclopentadienyl)-μ-(η^4-1,3-dimethyl-2,4-dipropyl-cyclobutadiene)dicobalt(14) was decomposed to give 1,3,5-trimethyl-2,4,6-trip-ropylbenzene through an intermediate complex by the reaction of 2-hexyne.
한국 비평의 ‘독자성(獨自性)’에 대한 시론(試論)-1950년대(年代) 비평(批評)을 중심(中心)으로-
심동주 ( Sim Dong-soo ) 한국어문교육연구회 2003 어문연구(語文硏究) Vol.31 No.2
1950年代 批評을 고찰함에 있어 本稿가 주목한 점은 이 시기가 모든 價値가 붕괴된 ‘영도(Zero)’의 지점이라는 사실이다. 이 점이 중요한 것은 ‘영도’의 지점이야말로 韓國 批評史에 있어 ‘批評이란 무엇인가’라는 자신의 自明性에 대한 질문이 現實化되기 때문이다. 따라서 1950年代 批評은 批評的 主體에 대한 물음과 더불어 비평의 조건에 대한 탐색을 시작한다. 李箱 文學에 대한 고찰을 통해 ‘나르시스’라는 새로운 批評的 主體의 象徵을 형성한다. 또한 文學과 批評의 조건으로서 ‘言語’에 대한 모색을 통해 언어자체에 목적을 두는 非指示的 言語觀을 定礎한다. 이 과정을 통해1950年代 批評은 스스로에게서 規準을 마련하는 自己目的的인 批評을 정립한다. 이와 같이 1950年代 批評은 그 출발이 비록 ‘영도’에서 비롯되었으나, 自己存在의 근거를 스스로에게서 가늠하는 최초의 가능성의 자리에 놓이게 된다. Studying 1950’s criticism, the fact that this time was the point of ‘Zero', the period when all value collapsed, is regarded attentively. The reason of importance of this fact, in korean critical history, is question of self evidence-‘what is criticism'-was realized. And the character of 1950's criticism is that the desire of self confirmation was spouted densely more than ever. Therefore it is unquestionable result that Lee, Sang's literature is placed on the beginning point of 1950's criticism and critical subject takes the form of the symbol of ‘Narciss'. In this period, ‘Narciss' meant the loss of self identity and the critical self consciousness doubting about self evidence constantly. Though it began from ‘Zero', through the doubt of self-evidence, 1950's criticism got the position as the first possibility that judges the basis of self-existence from oneself. The severance between self and world is inevitably linked with the question of language. 1950's criticism constructed anti-referential language of which aim is language itself through critique of understanding language as implement which emphasizes confrontation with thing one to one. The importance of the critical expression is perceived and the research of the creative criticism is deepened. Because a point of contact between works and criticism isn't analyzed only one meaning, the emphasis on the layer of content moves to that of form. But more important fact is the conception of critical identity is made by this. In other words, self purposed criticism which supplies self criterion with itself is made.