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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.
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.
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.
Chua's 회로와 카오스칩을 이용한 동기시스템의 성능분석
박현규,안기형,최부귀 동아대학교 정보기술연구소 2000 情報通信硏究所論文誌 Vol.8 No.1
최근 Chua's 발진기를 이용한 동기회로는 카오스 회로의 제어 시스템으로 많은 주목을 받고 있다. 본 논문에서는 PSPICE 시뮬레이션을 통하여 두 개의 Chua 회로가 동기 가능함을 보였으며, Chua 회로와 카오스 칩을 각각 사용한 카오스 동기 시스템을 만들었다. 동기 시스템은 송신기와 수신기로 구성하였고, 송신기에서 정보 신호를 카오스 변조하여 전송하고 수신기에서 복원함으로써 두 시스템 사이에 동기가 이루어짐을 확인하였다. Recently, synchronization circuit of Chua's oscillator has attracted attention as the control system of chaotic circuits. In this paper, we showed the synchronization of the two Chua's circuits through PSPICE simulation and made two respective identical chaos system using Chua's circuit and chaos chip. Synchronization was confirmed to be realized between two systems by consisting two systems into transmitter and receiver, modulating and transmitting information signal into chaos from transmitter, and demodulating at receiver.
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.
Si 웨이퍼 내의 깊은 준위 분포 특성 파악에 관한 연구
홍창희,윤기정,안기형 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
Distributions of deep levels are studied in the n-type Si wafer which are introduced during fabrication with e-beam deposition by using DLTS technique. Test is carried out on the Schottky diode. Metalization of the diode is done by e-beam deposition before of after electron irradiation. Deep levels of the defects are measured by using various metal such as Pd/Au, Au, Pd, Ti, Mo and Hf, and by changing the annealing temperature. It is approved that some defects are introduced in the neighbor of interface of silicon and metal by e-beam deposition, and main defect of them is E(0.42) level. In the resuts, two types of the deep level are observed ; one type is that is independent of electron irradiation, for example, E(0.42) level which is observed near the interface ; another type is that is observed only in the diode deposited by e-beam after electron irradiation, for example, E(0.18) level and so on which are observed farther from the interface. It may be the reason that interaction is presented between defects from Pd, at least, and prior defects.
계수 행렬의 삼각 분해에 의한 2-D 디지털 필터의 실현
김명기,김태수,안기형 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
This paper proposes a new approach to the realization of 2-D FIR and IIR digital filters based on the triangular decomposition of the coefficient matrix of the filters. Decomposing the coefficient matrix of an arbitrary rational 2-D transfer funcition into the triangular matrix, the coefficient matrix can be realized in terms of polynomials of order one. The proposed method offers a number of attributes for VLSI implementation including high parallelism as well as great modularity, regularity, flexibility, and generality. And the method requires much less number of computations and register coefficients than that for the Singular, Jordan decomposition or canonical realization schemes. And the described method is also extensible to m-D digital filters.