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김호표(H.P Kim),허연(Y Hur),최재명(J.M Choi),김상권(S.G. Kim),이호용(H.Y Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Compensators need to keep the voltage properly at the KEPCO system in a middle-long term point of view. Therefore, it is necessary to forecast the amount of compensators. In this paper, we analyze how much compensators are needed and what kind of effects is given on the KEPCO system in a middle-long term point of view. In addition, this analysis is based on the books named "The plan of Transmission and Substation at the KEPCO in 2005" and we used PSS/E program when we analyze the KEPCO system.
에스테르 교환 반응 및 Poly(trimethylene trerephthalate) 의 축중합 반응 속도에 관한 연구
나상권,김정규,홍완해 한국공업화학회 2000 응용화학 Vol.4 No.1
The transesterification of dimethyl terephthalate(DMT) with 1,3-propane diol(PDO) was invesigated in the presence of catalyst, titanium(IV) butoxide, at 175∼190℃. The degree of esterification reaction was measured by the output of methanol which was distilled from the reactor. The polycondensation of PTT was also investigated by the required current that mixing speed was kept constant, in the presence of titanium(IV) butoxide and thermal stabilizer at 260∼280℃.
폴리트리메틸렌 테레프탈레이트 / 폴리에틸렌 나프탈레이트 용융 블렌드
나상권,김정규,홍완해 한국공업화학회 2000 응용화학 Vol.4 No.1
Melt blends of poly(trimethylene terephthalate)(PTT) and poly(ethylene 2,6-naphthalate)(PEN) with various compositions were prepared at 275℃ using 40rpm for various mixing times. Transesterification and misibility of blends of PTT with PEN was studied by dynamic mechanical thermal analysis(DMTA) and NMR.
폴리트리메틸렌텔레프탈레이트 / 폴리비스페놀카보네이트 용융 블렌드 (1)
나상권,김정규,홍완해 한국공업화학회 2000 응용화학 Vol.4 No.2
Melt blends of poly(trimethylene terephthalate), PTT and Poly(Bisphenol A carbonate), PC with various compositions were prepared at 275℃ using 40rpm for 60min. Thermal properties of PTT/PC blends have been studied by differential scanning calorimetry(DSC) and dynamic mechanical thermal analysis(DMTA). The glass transition temperatures of blends increased as the amount of PC increased. Each blend showed a single peak of tan δ in the glass transition region, suggesting that PTT and PC might be compatible.