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일반적인 플랜트에 대한 시간지연을 이용한 제어기법의 안정성 해석
권오석,장평훈,정제형,Kwon, Oh-Seok,Chang, Pyung-Hun,Jung, Je-Hyung 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
Time Delay Control(TDC) is a robust nonlinear control scheme using Time Delay Estimation(TDE) and also has a simple structure. To apply TDC to a real system, we must design Time Delay Controller to guarantee stability. The earlier research stated sufficient stability condition of TDC for general plants. In that research, it was assumed that time delay is infinitely small. But, it is impossible to implement infinitely small time delay in a real system. So, in this research we propose a new sufficient stability condition of TDC for general plants with finite time delay. And the simulation results indicate that the previous sufficient stability condition does not work even for small time delay, while our proposed condition works well.
권오석(Oh Seok Kwon),강이석(E Sok Kang) 대한공업교육학회 1983 대한공업교육학회지 Vol.8 No.2
It is important in image processing to select an adequate threshold of gray level for extracting objects from their backgrounds. In this paper, a new algorithm is described whereby an optimum threshold is selected automatically as a result of a gray level smoothing process. The proposed algorithm is very simple and straightforwardly extensible to multithreshold problems.
시간지연제어기법을 이용한 측 방향 미끄러짐 및 요 감쇠 보상 강인 조향 제어
권오석(Oh-Seok Kwon),이선봉(Seonbong Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper we treat robust steering control using time delay control for the vehicle dynamics variation due to tire/road contact condition variation and lateral disturbance force due to side wind and yaw disturbance moment due to the difference between left tire's pneumatic pressure and right one's. And we deal with side slip and yaw damping compensation under fast steering at the high speed of vehicle. So we intend that a driver consider only path to go and do not have to consider vehicle dynamics variation, disturbances and undesired side slip and yaw oscillations. From the simulation results, we find out robustness for vehicle dynamics variation and disturbances when using time delay control and we evaluate side slip and yaw damping compensation capability under fast steering at the high speed of vehicle for the three control methods.