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韓相鉉,李光一 光云大學校 1981 論文集 Vol.10 No.-
In a synthesis process of �-naphthol by sulfonation from naphthalene, Na�SO�and SO�gas which produced from alkali fusion reuse for the neutrization process, and so production cost was reduced. Recently yield of �-naphthol by usual process was 82%, but by our a study when a pressured reaction condition was applied to alkali fusion process, yield of �-naphthol was increased to 91%
Performance Evaluation of Five-DOF Motion in Ultra-precision Linear Stage
이광일,양승한,이재창 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.1
In this study, the performance of five-DOF motion in ultra-precision linear stage is evaluated accurately by extending the application of the ISO 230-2 International Standard, which is focused only on the linear displacement motion of a linear stage. The bidirectional accuracy and bidirectional repeatability of positioning in five-DOF motion are calculated by measured geometric errors. Five geometric errors except for the linear displacement error of a linear stage are measured simultaneously using the optimal measurement system, which is designed to enhance the standard uncertainty of the estimated geometric errors. The geometric errors are in good agreement with those from the laser interferometer. In addition, the confidence intervals of the performances are determined by the uncertainties of the equipment used in the experiment.
경계적분법과 세그멘테이션 기법에 의한 광대역 마이크로스트립 로트만 렌즈의 해석 및 설계
이광일,오승엽 한국전자파학회 2003 한국전자파학회논문지 Vol.14 No.7
본 논문은 경계적분법과 세그멘테이션 기법을 이용하여 광대역 주파수 및 광 조향각 범위에서 빔조향이 가능한 마이크로스트립 로트만 렌즈의 해석 및 설계를 제안하고 있다. 렌즈 각 포트간의 모든 상호결합과 다중반사 및 선로간 불연속 특성이 해석에 포함되었다. 등간격 포트 설계를 통해 광조향각 범위에서 배열포트의 출력 리플을 억제하는 구조를 구현하였다. 12 입력 12 출력의 각 포트에 지수함수 테이퍼를 적용하여 임피던스 정합 및 포트간 상호결합을 해석하고 최적화하였다. 제작된 렌즈는 측정결과 6~18 GHz의 광대역 주파수 범위와 $\pm$53$^{\circ}$의 조향각 범위에 대해 $\pm$1.8 dB 이하의 삽입손실 편차와 1$^{\circ}$이하의 조향 정확도를 가지며, 해석결과 와도 잘 일치함을 확인하였다. This paper presents analysis and design of microstrip Rotman lens operating over wide band and wide steering angle by the contour integral method along with the segmentation method. All mutual coupling, internal reflections between ports and the discontinuity at every junction are taken into account. Equally spaced ports are designed and realized, which make suppress output ripple through the array ports. Impedance matching and mutual coupling between ports are analyzed and optimized using 12 input and 12 output exponential tapers. The measured results of fabricated lens show ${\pm}$ 1.8 dB insertion loss deviation over 6∼18 GHz wide frequency range and beam steering accuracy less than 1$^{\circ}$over ${\pm}$53$^{\circ}$angle and agrees well with the analysis results.