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이무영,오도창,권우현,Lee, Moo-Young,Oh, Do-Chang,Kwon, Woo-Hyen 한국정보처리학회 2003 정보처리학회논문지 C : 정보통신,정보보안 Vol.10 No.5
본 논문에서는 CDMA 시스템에서 전력제어의 성능을 향상시킬 수 있는 수정된 분산전력제어(M-DCPC) 알고리즘을 제안하였다. 제안한 방법의 제어 성능을 보이기 위해 각 이동국의 SIR 응답 속도와 셀(cell) 내에서의 Outage 확률을 기존의 DCPC, CSOPC와 LQPC과 비교하였다. SIR 명령이 변화되는 상황에서, M-DCPC의 SIR 응답 속도가 기존의 다른 알고리즘들에 비해 더 빠르고 적은 오버슈트를 가짐을 모의실험을 통해 확인하였다. Outage의 경우, M-DCPC의 수렴속도가 CSOPC의 수렴속도보다 더 빠름을 확인하였다 CSOPC의 경우 반복횟수가 거듭될수록 SIR 명령에 대한 응답 속도가 느려지게 되는데, 이 때 SIR 명령치가 변화할 경우, CSOPC에서는 다량의 Outage가 발생하지만, M-DCPC는 거의 영향을 받지 않는 것을 확인할 수 있었다. This paper proposes a modified DCPC (Distributed Constrained Power Control, M-DCPC) algorithm that can improve the performance of a CDMA power control system. The control performance of the proposed method is verified using two performance measures : the SIR response of each mobile and the outage probability in a cell. As regards the SIR response, in simulations, the M-DCPC algorithm has shown a faster convergence and lower overshoot in transient time than the other power control algorithms when the desired SIR value was varying. For the outage probability. M-DCPC converged to a fixed outage rate faster than CSOPC while also maintaining the system capacity to make as high a connection as CSOPC. In particular, when the desired SIR was varying, CSOPC showed an abrupt outage probability increase during the desired SIR Increase, yet M-DCPC was unaffected.
고정자 전류 기반의 MRAC를 이용한 유도전동기의 센서리스 벡터제어에서 회전자 시정수의 보상
박철우(Chul-woo Park),윤경섭(Kyung-sup Youn),임성운(Sung-woon Im),구본호(Bon-ho Ku),권우현(Woo-hyen Kwon) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
The thesis proposes the sensorless vector control method that estimates the rotor speed and rotor time constant at the same time using stator current In the proposed method, stator current error in the stationary reference frame is proportional to estimated speed error, and stator current error in the synchronous reference frame is proportional to estimated rotor time constant error The proposed method can simultaneously produce a fast speed estimation and rotor time constant estimation Therefore, this new method offers an improvement In the performance of a sensorless vector controller. And, the superiority of the proposed method is verified by simulation.
마진석,강명숙,권우현,임성운,변승완 ( Jin Suk Ma,Myung Sook Kang,Woo Hyen Kwon,Sung Woon Im,Seung Whan Byun ) 한국센서학회 1998 센서학회지 Vol.7 No.1
In this paper, we analyzed the effect of the time delay of the image sensor in the tracking loop of Electro-Optical `Tracking System(EOTS). we showed that Smith predictor can greatly improve the stability and various performances of EOTS with time delay. And also, to verify the realistic validity, we executed the experiment in EOTS recently developed, and confirmed the effectiveness in EOTS.
윤경섭,이무영,김우현,권우현 ( Kyung Sup Yoon,Moo Young Lee,Woo Hyun Kim,Woo Hyen Kwon ) 한국센서학회 1997 센서학회지 Vol.6 No.4
The measure of motor speed using encoder is difficult to detect accurate speed and direction in very low speed because the intervals between an encoder pulse and pulse are long. So various speed estimation techniques were proposed to have the good dynamic performance in low speed. And direction detection is so important as speed measurement in very low speed. But because the conventional direction detection circuit check the direction only 1 time in 1 period of each encoder pulses, so it has long delayed detection time in very low speed, thus accurate detection of direction is difficult. In this paper, we propose a 2 way edge det~tion method which can detect at the rising and falling edge of each encoder pulses. So it can check the direction 4 times in I period of each encoder pulses. Therefore if we use proposed method, we can reduce the detection time as 1/4 than that of conventional circuit and can detect more accurate speed and direction. And computer simulation and experiment is performed to verify the perfomance and effect of proposed circuit and we analyze it`s results by comparing with that of conventional circuit.