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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.
손으로 설계한 서식 문서의 문자 영역 분리 및 서식 벡터화
권오석 ( Oh Seok Kwon ),김병용 ( Byeong Yong Kim ) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.10
In this paper, we proposed a method of the text area segmentation and layout vectorization of off-line handwritten forms. We applied DRC algorithm to the scanned image to protect data loss during binarization and thinning of the image. To detect the skew angle of the image, we applied the Hough transform to the image and estimated the angle of the skew. After correcting the skew angle, we extracted the line components of the image, which constitute the frame of the form. The character areas of the image are calculated based on white-pixel connected components extraction method and the vectors of the extracted line components are estimated by sorting, merging and refinements. In order to show the abilities of the proposed method, experiments with two kinds of forms that were written by 25 people are performed. One was drawn with a ruler and the other was drawn without a ruler and all of them were written with freely chosen writing tools. As a result, we got 666 vectors without preprocessing and 746 vectors with preprocessing among 750 vectors respectively, which showed the effectiveness of the method.
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.