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안기형,박현규,박재형,양기철,최부귀 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1
The control of Chaos system is difficult because the system has characteristics of nonlinear and unstable. In this paper, we confirm synchronization between transmitting and receiving systems using Chua's circuits. This system is controlled by negative feedback, continuously.
설재훈,정영호,장종승,임영도,최부귀 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1
In this paper, we apply the controller output error method to the adaptive fuzzy control design. This method employs a gradient descent algorithm to minimize a error function which is beased on the error at the controller output. This contrasts with more conventional methods which use the error at the plant output. The error function is minimized by adapting some or allof the parameters of the fuzzy controller. In this paper, we propose to revise the consequent parameter. The proposed adaptive fuzzy controller is applied to the adaptive control of a nonlinear plant and is shown to be capable of providing good overall system performance.
고유 불안정한 도립진자 시스템의 최적 안정화 제어에 관한 연구
최부귀,박영식,안기형,이취중 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.1
This paper proposes a design techinque of dynamic stabilization controller for the intrinsic unstable inverted pendulum system. Mathematical modelling with the more complex nonlineaity and the stabilized control theory presented by C.D. Johnson are adapted to this system by using the stage-space approach. And the stabilized controller with the designed optimal regulator type which can be fastly tracked and can be accurately counteracted against all effects of the constant disturbances and the parameteric variations is sumulated and is implemented successfully on the microcomputer.
안기형,박현규,최부귀,이종헌 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1
This paper consist of new secure communication system from using synchronization methode of chaotic signal which Pecora and Carroll have shown, and experimentally proved the validity of this communication system. This communication system transmits the informational signals via the modulation of chaotic signals, and the receiver recovers the original informational signals from modulate chaotic signals by synchronization of chaotic signals driven together Chua circuit was used in generating chaotic signals and nonlinear resistor of this Chua circuit was confirmed by using two OP amps and six resistors.
비선형 특성의 근사 선형화를 이용한 도립 진자 시스템의 안정화 제어
안기형,최부귀 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.1
When we design a stabilizing controller for a nonlinear system, we usually linearizing the system, and then utilize linear control theory. Thus the performance of the closed loop system depends on the linearizing method used in the controller design. The state space linearization by feedback and nonlinear coordinate transformation is an effective method of control design for a certain class of nonlinear system, but it is not applicable to all systems. In this paper, we proposed approximate feedback linearization method using the differential geometric theory. First, the inverted pendulum system is transformed into the approximate feedback linearized model by nonlinear state feedback. Secondly, the linear controller is designed using the pole placement method for the approximate feedback linearized model. The simulation results are also shown to verify the proposed method.