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고 에너지 레이저 빔 파면 보정장치의 안정도 향상을 위한 연구
정종규(Jongkyu Jung),이수만(Sooman Lee) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.2
The adaptive optics for compensating for optical wavefront distortion due to atmospheric turbulence has recently been used in systems that improve beam quality by eliminating the aberrations of high power laser beam wavefront. However, unseen-mode, which can not be measured in the wavefront sensor, increases the instability of the laser beam wavefront compensator on the adaptive optics system. As a method for improving such instability, a mathematical method for limiting the number of singular values is used when generating the command matrix involved in generation of the drive command of the wavefront compensator. In the past, however, we have relied solely on experimental methods to determine the limiting range of the singular values. In this paper, we propose a criterion for determining the limiting range of the singular values using the driving characteristics and the correlation technique of the wavefront compensator"s actuators and have proved its performance experimentally.
천승우(Seungwoo Chun),박원태(Wontae Park),이수만(Sooman Lee),양유경(Yukyung Yang) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
When observing stars from the ground, the wavefront of the star is distorted by a change in the wind, air pressure, and the air flow. The adaptive optics system can be used to overcome this wavefront distortion problem. However, this adaptive optics system makes a long delay time due to a lot of operations. The time delay caused by the signal processing affects the decrease of a phase delay in the adaptive optics system. In this paper, we propose the signal processor makes the delay time to be minimized.
정종규(Jongkyu Jung),박원태(Wontae Park),이수만(Sooman Lee),유재은(JaeEun Yoo),최영수(YoungSoo Choi),김성수(SungSoo Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
When observing the stars from the ground or the measurement of the laser beam which is reflected from the object, the wavefront of the laser is distorted since a change in the wind, air pressure and the movement. To overcome these problem, the adaptive optics system is used. As controller for correction in this system, PI controller is mainly used. The time delay caused by the sensor and the signal processing is increase a phase delay in the Adaptive Optics system. The performance of the controller is decreased. In this paper, we proposed control method for real time correction and minimizing phase delay using phase compensator.
휘어진 공간에서의 스컴 모델에 의한 hadron의 상전이
이수만 순천향대학교 1994 논문집 Vol.17 No.1
스컴 모델과 glueball을 결합한 모형을 채택하였다. Flat space의 라그랑지언을 휘어진공간(S³)상의 라그랑지언으로 변환시켰다. Tetrad를 사용하여 S³의 metric을 구하고 이를 R⁴의 구좌표계로 parametrize하였다. Headgehog ansatz를 사용하여 휘어진 공간에서의 energy functional을 구하고 이를 minimize 함으로써 solition profile function과 glueball field가 couple된 미분방정식들을 얻어 그들의 해를 구하였다.