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Organosilylamine 및 Disilazane 과 Isocyanate와의 반응
李日珪 東國大學校 1971 論文集 Vol.8-9 No.-
Hexamethyldisilazane, N-ethylhexamethyldisilazane 및 Diethyltrimethylsilylamine과 10배량의 phenylisocyanate 및 Ethylisocyanate를 각각 여러 온도(20-150℃)에서 반응 시켰으며 이때 Silylamine과 phenylisocyanate와의 반응에 있어서는 반응 온도에 관계 없이 phenylisocyante의 3량체인 Triphenylisocyanurate만을 생성 하였으며 또한 Disilazane의 경우 100℃ 이하의 온도 에서는 Silylamine과 같이 Triphenylisocyanurate만을 생성하였고 150℃에서는 이상생성물인 2량체의 탈탄산물(Diphenylcarbodi-imide)과 Diphenylcarbodi-imide의 3량체(1, 3, 5-triphenyl1-2, 4, 6-tri(phenylimino)-hexahydro-l, 3 5-triazine) 및 Diphenylcarbodi-imide 한 분자와 phenylisocyanate 2분자의 중합체(1, 3, 5-triphenyl-4-phenyliminohexahydro-1, 3, 5-triazine-2, 6-dione)를 생성하였다. 그리고 Silylamine 및 Disilazane과 Ethylisocyanate의 반응에서는 각 반응 온도에 관계 없이 다만 Ethylisocyanurate의 단일 물질만을 생성하였다. Reactions of hexamethyl- and N-ethylhexamethyl-disilazanes and of diethyltrime-thylsilylamine with a ten fold excess of phenyl- and ethylisocyanates were studied respectively at varied temperatures(20-150). In the reaction of phenylisocyanate with silylamine, the silylamine acted as a catalyst only for the formation of triphenylisocyanurate, the cyclic trimer of phenylisocyanate, regardless of its reaction temperature. In the case of that with disilazane, although it acted to produce triphenylisocyanurate as the silylamine did at the temperature below 100, at 150, it gave three abnormal products-diphenylca-rbodiimide, 1, 3, 5-triphenyl-2, 4, 6-tri(phenylimino)hexahydro-1, 3, 5-triazine, and 1, 3, 5-triphenyl-4-phenyliminohexahydro-1, 3, 5-triazine-2, 6-dione with evolution of carbon dioxide respectively. Meanwhile, in the reaction of ethylisocyanate with silylamine and with disilazane, each of them gave only ethylisocyanurate at any reaction temperatures.
PLL을 이용한 Ku-Band 주파수 합성기 설계 및 제작에 관한 연구
이일규,민경일,안동식,오승협 한국통신학회 1994 韓國通信學會論文誌 Vol.19 No.10
Ku-Band주파수 합성기를 PLL과 주파수 체배 방법을 이용하여 설계 및 제작하였다. 안정된 약 1 GHz의 주파수를 합성하기 위해 PLL 회로의 설계 과정 및 동작 특성을 제어이론을 바탕으로 고찰하였다. 안정된 약 1 GHz PLL 회로에 주파수 2 체배기, 주파수 8 체배기를 연결하여 Ku-Band 주파수를 합성하였다. 실험결과를 통하여 Ku-Band 주파수 합성기 설계 방법의 타당성을 확인하였다. The design and implementation of Ku-Band frequency synthesizer was accomplished by the use of PLL and frquency multiple method. Design procedure and operation characteristics of PLL circuit were analyzed on the basis of control theory to synthesize about 1 GHz frequency which should be stable. By connecting frequency doubler and frequency eighth multiplier to the designed PLL circuit in series, Ku-Band frequency was synthesized. The validity of design method of Ku-Band frequency synthesizer was verified through experimental results.