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直接擴散 스펙트럼 通信에서의 連續性 干涉波 除去에 관한 硏究
崔富貴,邊健植 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.2
This paper presents theoretical analysis and experimental result on an improved interference rejection circuit in the presence of continuous wave interference at center frequency, particulary in DS spread spectrum communication systems. This circuit is based upon a phase locked loop for estimation the CW interference phase and the MSE technique to minimize the estimation error. Therefore, the introduced rejection circuit that minimized the estimated phase error outperforms the rejection circuit with phase estimation only. As a result of experiment, we confirm that this proposed rejection circuit gives a high degree of interference rejection performances when the input J/S is large.
최부귀,김종훈 대한전자공학회 1977 전자공학회지 Vol.14 No.3
In this paper, a series inverter circuit is constructed by using the pinch-off characteristics of FET, and itsoutput characteristics is analysed for the variation of gate bias frequency and load. The above constructed circuit could eliminate the unstable output characteristics of SCR-series inverter fir chit by the changes of gate bias frequency and load resistor. But the current capacity of the FET-series inverter circuit is relatively small, and is recommended to be used for light loads. 본 논문은 FET의 핀치오프특성을 이용하여 직렬인버어터회로를 구성하고 그것의 출력특성을 게이트바이어스 주파수 및 부하의 변동에 따라 분석하였다. 상기 회로는 SCR직렬인버어터회로에서 생기기 쉬운 게이트바이어스주파수 및 부하의 변동에 따른 출력의 불안정을 제거하였다. 그러나 FET직렬인버어터의 전류용량이 적어 경부하에 적당하다.
한창훈,박윤명,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
This paper describes an intelligent cruise control system for automobile. With the remarkable numerical increase of automobiles on the road, the optmized traffic flow control using the cruise control is one of the very important traffic problems to overcome the limitation of an existing road capacity. Based on this idea that minimize the fuel cost and the air pollution, and accept a driver's need for driving, we have developed an intelligent cruise control system for vehicle. This proposed intelligent fuzzy cruise controller was successfully implemented using the fuzzy algorithm, the i80c196 μ-controller board and the throttle valve actuator. The field test results on an linear road was introduced.
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.
崔富貴,金斗泳 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.1
In this paper, we propose the new algorithm for image vector quantizer. Image data is seperated to the edge part and nonedge part. Edge part is classified and edge table is generated. Using this edge table, codebook for edge data is generateted by LBG algorithm through the distance measure of abstract difference. Codebook for nonedge data is conventional one. Experimental results for X-ray image are compared by proposed vector quantizer and conventional one.
한창훈,최부귀 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 presents an adaptive critic self-learning control system with Cerebellar Model Articulation Controller(CMAC)-based decoder integrated with the Associative Search Element(ASE) and Adaptive Critic Element(ACE)-based scheme. The task of the system is to pole that is hinged to a movable cart by applying forces to the cart's base. The problem is that error feedback information is limited. The ASE incorporated prediction information for reinforcement from a critic to produce evaluative information for the plant. The CMAC's information interpolation improves the learning speed. And we developed inverted pendulum software tool to show control capability with neural network.
崔富貴,邊健植 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1
In this paper, the fundamental theory of speech analysis is explained and a class of stable lattice method for linear prediction is presented. This method guarantee the stability of the all pole filter and a low computational cost comparable to the DURBIN method among the another traditional methods. Particulary, this method present that a PARCOR coefficient can be calculated without the calculation of linear prediction coefficient.
한계 입력 내에서 단축 경로를 갖는 로봇 매니퓰레이터의 퍼지 강인 제어기의 설계
박재형,김승철,최부귀 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1
불확실한 모델과 외란을 가진 로봇 매니퓰레이터를 제어하기 위해, 비선형 강인 제어기가 적합하다. 본 논문에서는 불확실한 로못 매니퓰레이터의 제어에 강인 제어기를 적용할 때 발생하는 입력 토크의 포화를 해결하기 위한 알고리즘을 제안한다. 이 알고리즘은 퍼지 논리를 이용하여 초기의 경로를 바탕으로 새로 생성된 단축 경로를 생성하는 것이다. Robot manipulators are operated under model uncertaily, and their dynamics are highly nonlinear. To control them, nonlinear robust controllers are appropriate, but they need high torques so that actuators such as acuating motors can face torque saturation. In this paper, a new scheme is presented to achieve fast tracking in the presence of torque saturation. The scheme generates a new reduced path based onthe initial desired path using a fuzzy logic. Numerical examples are shown to validate the proposed controller using an uncertain two degree-of-freedom underwater robot manipulator.
전염병의 모델에 있어서 파라메타 값에 관한 수치해석적 연구
최부귀,김성대 대한의용생체공학회 1992 의공학회지 Vol.13 No.4
This paper considers a model for the spread of an infection of the type proposed by K.L. Cooke. The model involves a threshold for becoming infective that lead to functional rather than ordinary differential equations. Three type of result presented. In sections 3, and 4 the dependence of the solution on parameters in the model is studied numerically.