• 한국통신학회논문지
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• 제25권6B호
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• pp.114-114
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• 2000

In this paper, a current comparative frequency automatic tuning circuit for the CMOS bandpass filter are designed with the new architecture. And also, when the designed circuit is compared the typical tuning circuit, it has very simple architecture that is composed of the current comparator and charge pump and operated in 2V power supply. The proposed tuning circuit automatically compensate the difference between the operating current of the integrator and the reference current which is specified. Using CMOS 0.25um parameter, a CMOS bandpass active filter with center frequency(f0= 100MHz) is designed, and according to the transister size the variation of the center frequency is simulated. As the HSPIC simulation results, the tuning operating of the proposed current comparative frequency automatic tuning circuit is verified.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1996년도 추계학술대회 논문
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• pp.150-155
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• 1996

This paper presents a new approach to the design of self-tuning adaptive control system that is robust to the changing dynamic configuration as well as to the load variation factors using digital signal processors for robot manipulators. TMS3200C50 is used in implementing real-time adaptive control algorithms provide advanced performance for robot manipulator. In this paper an adaptive control scheme is proposed in order to design the pole-placement self-tuning controller which can reject the offset due to any load disturbance without a detailed description of robot dynamics. parameters of discrete-time difference model are estimated by the recursive least-square identification algorithm and controller parameters are detemined by the pole-placement method. Performance of self-tuning adaptive controller is illusrated by the simulation and experiment for a SCARA robot.

• 전자공학회논문지B
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• 제32B권8호
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• pp.1119-1126
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• 1995

The construction of rule-base for a nonlinear time-varying system, becomes much more complicated because of model uncertainty and parameter variations. Furthemore, FLC does not have an ability of adjusting rule- base in responding to some sudden changes of control environments. To cope with these problems, an auto-tuning method of the fuzzy rule-base is required. In this paper, the GA-based Fuzzy-Neural control system combining Fuzzy-Neural control theory with the genetic algorithm(GA), which is known to be very effective in the optimization problem, will be proposed. The tuning of the proposed system is performed by two tuning processes(the course tuning process and the fine tuning/adaptive learning process). The effectiveness of the proposed control system will be demonstrated by computer simulations using a two degree of freedom robot manipulator.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.754-758
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• 1996

This paper presents a new approach to the design of self-tuning adaptive control system that is robust to the changing dynamic configuration as well as to the load variation factors using Digital signal processors for robot manipulators. TMS320C50 is used in implementing real-time adaptive control algorithms to provide advanced performance for robot manipulator, In this paper, an adaptive control scheme is proposed in order to design the pole-placement self-tuning controller which can reject the offset due to any load disturbance without a detailed description of robot dynamics. Parameters of discrete-time difference model are estimated by the recursive least-square identification algorithm, and controller parameters we determined by the pole-placement method. Performance of self-tuning adaptive controller is illusrated by the simulation and experiment for a SCARA robot.

• 한국통신학회논문지
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• 제25권6B호
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• pp.1114-1119
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• 2000

In this paper, a current comparative frequency automatic tuning circuit for the CMOS bandpass filter are designed with the new architecture. And also, when the designed circuit is compared the typical tuning circuit, it has very simple architecture that is composed of the current comparator and charge pump and operated in 2V power supply. The proposed tuning circuit automatically compensate the difference between the operating current of the integrator and the reference current which is specified. Using CMOS 0.25um parameter, a CMOS bandpass active filter with center frequency(fo=100MHz) is designed, and according to the transister size the variation of the center frequency is simulated. As the HSPICE simulation results, the tuning operating of the proposed current comparative frequency automatic tuning circuit is verified.

• Journal of Advanced Marine Engineering and Technology
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• 제39권10호
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• pp.1031-1036
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• 2015

Proportional-integral-derivative (PID) controllers are widely used in industrial sites. Most tuning methods for PID controllers use an empirical and experimental approach; thus, the experience and intuition of a designer greatly affect the tuning of the controller. The representative methods include the closed-loop tuning method of Ziegler-Nichols (Z-N), the C-C tuning method, and the Internal Model Control tuning method. There has been considerable research on the tuning of PID controllers for single-input single-output systems but very little for multi-input multi-output systems. It is more difficult to design PID controllers for multi-input multi-output systems than for single-input single-output systems because there are interactive control loops that affect each other. This paper presents a tuning method for the PID controller for a two-input two-output system. The proposed method uses a real-coded genetic algorithm (RCGA) as an optimization tool, which optimizes the PID controller parameters for minimizing the given objective function. Three types of objective functions are selected for the RCGA, and each PID controller parameter is determined accordingly. The performance of the proposed method is compared with that of the Z-N method, and the validity of the proposed method is examined.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.271-272
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• 2006

This paper presented a new experimental gain tuning technique for a Multi-Axis Servo System. First, the investigation for proportional gain of velocity control loop by using a Dynamic Signal Analyzer (DSA) was performed. Using the FUNCTION characteristic of DSA based on the Bode plot, the Bode plot of open loop transfer function was obtained. In turn, the integral gain of a servo controller can be found out by using the Integration time constant extracted from the Bode plot of open loop transfer function. In the meanwhile, the positional gain of the servo controller has been obtained by using the Bode plot of the closed loop transfer function. We have also proposed the technique to find out an optimal parameter of a notch filter, which has a great influence on vibration reduction, by using the damping factor extracted from the Bode plot of closed loop transfer function.

• 조명전기설비학회논문지
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• 제19권2호
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• pp.114-123
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• 2005

서보 설비를 위한 순차적 파라미터 자동 튜닝 알고리즘을 갖는 영구자석 동기전동기(Permanent Magnet Synchronous Motor: PMSM)의 비선형 속도 제어 기법이 제시된다. 비선형 제어 방식은 시스템 파라미터와 부하상태가 정확하게 일치하지 않는 경우 만족스러운 성능을 줄 수 일다. 최근에 향상된 속도 제어 성능을 위해 적응형 기법, 슬라이딩 모드 제어, 및 관측기에 기반 한 기법들이 제안되었다. 하지만, 이 방법들은 관성의 큰 변화, 속도의 빠른 과도 특성 및 샘플링 주기 증가와 같은 특정한 조건에서 더 이상 만족스러운 성능을 제공하지 않는다. 일반적으로, 속도 동특성에 영향을 주는 주요 파라미터를 동시에 추정하기는 쉽지 않다. 이를 해결하기 위해 설치 및 기동시 전동기 주요 파라미터를 시간 구간 별로 나누어 자동으로 추정하는 순차적 파라미터 튜닝 알고리즘이 제안된다. 제안된 방식이 DSP TMS320C31을 이용하여 구현되고 유용성이 시뮬레이션과 실험을 통해 입증된다.

• 한국지능시스템학회논문지
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• 제15권5호
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• pp.605-614
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• 2005

에이전트 기반 플렉시블 화상회의 시스템은 데스크 탑 컴퓨터로 화상회의 시스템을 이용할 때 발생하는 시스템의 내 외적인 다양한 변동 및 이용자에게 가해지는 부담의 감소를 목적으로 설계된 화상회의 이용 지원환경이다. 본 논문에서는 플렉시블 화상회의 시스템의 유연성을 개선하기 위한 한 방법으로서 서비스 품질 파라미터 조정 기법을 적용한 화상회의 매니저 에이전트 내 지식 부분을 새롭게 설계한 T-INTER(Tuning-INTER) 아키텍처를 제안한다. 제안한 아키텍처를 기반으로 구축된 플렉시블 화상회의 시스템은 일반 이용자들이 화상회의를 이용할 때 발생하는 서비스 품질 요구 변경 및 시스템 부담 등의 문제를 유연하게 해결한다. 매니저 에이전트는 다른 에이전트와 프로토콜을 이용하여 긴밀하게 협조를 하며, 문제 해결의 진행상황을 고려하면서 QoS 파라미터를 자동으로 조정한다. 조정된 파라미터에 의해서 시스템은 변동에 대한 유연한 대응이 가능하게 되었고, 또한 이용자에게 가해지는 부담도 감소한다. 결국, 제안 아키텍처를 적용한 시스템이 기존 시스템과 비교하여 유연성이 증가되었음을 실험을 통하여 증명한다.

• 한국정밀공학회지
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• 제14권12호
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• pp.174-181
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• 1997

A proposed hybrid self-tuning control scheme for single rod hydraulic cylinder which has varying loads is presented here. An adaptive controller is developed for the system that use feedforward and P feedback control for simultaneous parameter identification and tracking control. Through experimental results, the performance comparison of the hybrid self-tuning controller with a constant gain P contro- ller clearly shows its superior ability in handling load changes in quiescent states.