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WCDMA 시스템에서 주파수 오차에 의한 단말기 성능 영향에 대한 연구
이일규,이동한,송명선,오승엽 한국전자파학회 2003 한국전자파학회논문지 Vol.14 No.6
WCDMA 시스템에서 주파수 오차에 의한 단말기 성능 영향을 분석하기 위해 기지국과 이동 단말기 사이의 주파수 오차 발생 원인을 고찰한 후 단말기 수신부에서 주파수 오차를 정정하기 위한 자동 주파수 오차 보상방법을 소개하였다. 시스템 요구 규격 중 자동 주파수 오차 보상 동작에 관련된 성능요구 조건들을 바탕으로 여 기지국과 단말기간 연동시험을 수행하였고 주파수 오차보상 후 단말기 송신 주파수에서 4 Hz의 주파수 차를 얻음으로써 시스템에서 요구하는 주파수 오차 허용량인 $\pm$ 0.1 ppm($\pm$200 Hz)이내의 규격을 만족함을 보였다. 주파수 오차에 의한 송신성능 열화를 에러벡터 크기(EVM) 값으로 확인하였으며 또한 수신 성능 열화를 Ec/Io로 측정하였고, 주파수 오차조정의 정확성을 개선시키기 위한 모뎀 제어신호와 RF 간 인터페이스 관계를 제시하였다. This paper explains the impact of frequency error on the performance of WCDMA mobile communication systems and what brings about the frequency error between the base station and the mobile station, and then presents automatic frequency error correction method in mobile receiver. On the basis of system requirement related to frequency stability, the integration test between the base station and the mobile station was accomplished. After applying automatic frequency error correction to mobile receiver, 4 Hz of frequency error at transmitting frequency was obtained. The result met frequency error requirement of ${\pm}$0.1 ppm(about ${\pm}$200 ㎐). Performance degradation due to frequency error was measured by means of Error Vector Magnitude(EVM) at transmitter and Ec/Io at receiver, respectively and then the interface requirement between Modem control signal and RF was suggested to improve the correctness of frequency error control.
Carbonyl 화합물에 대한 Trimethyl-Silylcyanide의 첨가 반응
한완수,박철영,이일규 中央大學校 自然科學硏究所 1988 自然科學硏究所 論文集 Vol.2 No.-
Trimethylsilylcyanide is found to be a good reagent for the formation fo trimethylsilylcyanohydrin ethers from the direct reaction with carbonyl compounds. To obtain organic cyanoderivatives, trimethylsilylcyanide was addes to vbarious carbonyl compounds (acetaldehyde, acetone, cyclohexanone, propiophenone, benzophenone) in the presence of Lewis acid catalysts at room temperature. Addition of small amounts of Lewis acid catalysts to the reactions increased the yields of trimethylsilylcyanide carbonyl addition products. The results of these reactions indicated that the yields in trimethylsilycyanide addition reaction to the highly hindered carbonyl compounds were affected by the nature of catalysts employed, and increased as below. AlCl₃>SnCl₄≫ZnCl₂
有機규소 화합물에 관한 基礎的 硏究 : 불포화 화합물과의 반응 Reaction of Organosilicon Compounds with unsaturated Compounds
이일규 東國大學校 1975 論文集 Vol.14 No.-
유기규소화합물(trimethylsilyl alkoxide, sulfide, -phosphine, -amine등)을 phenylisocyanate, phenylisothiocyanate 및 chloral과 여러 온도에서 수일 간 반응시켰다. phenylisoyanate와의 반응에서는 그 전환생성물인 N,N-diphenyluretidine-2, 4-dienetriphenylisocyanurate, diphenylcarbodiimide, 1, 3, 5-triphenyl-4-phenyliminchexahydro 1, 3, 5-triazine-2,6-dione 및 1, 3, 5-triphenly-2, 4, 6-triphenyliminohexahydro-1, 3, 5-riazine 등이었고, 이 때 네 가지의 trimethylsilyl 화합물은 isocyanate의 전환반응에서 촉매역할을 하였다. phenylisothiocyanate와 disilazane과의 반응에서는 isothiocyanate 의 C=N 및 C=S첨가체의 분해생성물인 N-methyl-N'-phenylcarbodiimide, bis(trimethylsilyl)sulfide, 및 N-phenylhexamethyldisilazane 및 methylthioisocyanate를 생성했다. Chloral과 trimethylsilyldiethylamine의 혼합물에서는 그 1:1 첨가체의 β-이탈 생성물인 N,N-diethylformamide와 trimethyl silytrichloromethide를 생성했다. Reactions of organosilicon compounds(trimethylsilyl alkoxide, sulfide, phosphine and -amine) with phenylisocyanate, phenylisothiocyanate and chloral were studied respectively at varied temperatures. In the reactions of phenylisocyanate with organosilicon compounds, the products were N,N-diphenyluretidine-2, 4-dione, triphenylisocyanurate, diphenylcarbodiimide, 1, 3, 5-triphenyl-4-plenyliminohexahyhro-1, 3, 5-triazine-2, 6-dione and 1, 3, 5-triphenyl-2, 4, 6-triphenyliminohexahydro-1, 3, 5-triazine, those were the conversion products of phenylisocyanate. The silicon compounds were acted as a catalyst in each of the reaction. In the reaction of phenylisothiocyanate with N-methylhexamethyldisilazane, N-met-hyl-N'-phenylcarbodiimide, bis(trimethylsilyl) sulfide, N-phenylhexamethyldisilazane and methylisothiocyanate were produced by the decomposition reaction of the 1 : 1 aducts of disilazane into N=C and C=S bond in the isothiocyanate. the reaction of chloral with trimethylsilyldiethylamine gave N,N-diethylformamide and trimethylsily trichloromethide which were produced by the β-elemination reaction of the 1 : 1 aducts of chloral and the amine.
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.