• Proceedings of the KIPE Conference
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• 2018.11a
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• pp.213-214
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• 2018

본 논문에서는 전기자동차 온-보드 충전기용 단상 cycloconverter-type high frequency link 컨버터의 전력 제어성능과 동적 응답특성을 개선하기 위하여 예측전류제어 기법을 적용한다. 배터리를 충전 및 방전하기 위하여 전력계통에 연결되는 V2G 충전기는 전압 변동, 고조파 왜곡 등의 외란 발생에도 강인한 동적 응답 특성을 유지하여야 한다. 예측전류제어 기법이 적용된 제어기는 계통 외란이 존재하는 경우에도 전력 레퍼런스를 빠르게 추적하고 정확한 듀티를 생성할 수 있으므로 우수한 동적 및 과도 응답특성을 갖는다. 제안하는 제어기의 성능과 파라미터 변동에 대한 민감도는 PSIM 시뮬레이션을 이용하여 평가되며, 여러 계통외란 상태에서 PI 제어기와 비교된다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1922-1923
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• 2011

본 눈문은 쿼드로터 무인항공기의 모델링 및 제어기 설계에 대해서 논의한다. 라그랑지안 방정식을 이용하여 쿼드로터 무인항공기 시스템을 모델링하며, 실험을 통해 모델 파라미터를 결정한다. 쿼드로터 모델과 구해진 파라미터 값을 PID 제어 기법과 동적표면제어기법을 이용하여 쿼드로터 무인항공기의 제어기를 설계한다. 마지막으로, 모의실험을 통해 PID 제어기와 본 논문에서 제안한 동적표면 제어기의 성능을 비교하고, 제안한 제어기의 우수성을 입증한다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1741_1742
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• 2009

본 논문은 측정 실패가 존재하는 비선형 시스템에 대한 동적 출력 궤환 퍼지 제어기의 설계에 대해 연구한다. 비선형 시스템을 Takagi-Sugeno (T-S) 퍼지 모델 기법을 이용하여 퍼지 시스템으로 모델링하고, 이를 바탕으로 동적 출력 궤환 퍼지 제어기를 설계한다. 폐루프 시스템의 안정도 조건을 선형 행렬 부등식 (LMI)로 나타낸다. 그리고 모의실험을 통해 제안된 제어기의 성능을 파악한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.8
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• pp.708-714
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• 1990

This paper has proposed a self-tuning controller for tracking reference trajectory by measuring End-point of arm on robot manipulator whose link is light and flexibls, and proved the perforformance of the algorithm proposed through the computer simulation. As an object of control, a flexible robot manipulator with two-links was selected. As for structure of model, it utilized an assume mode shape method with include travity force and derived a dynaics equation by adapting two kinds of vibration mode of each.

• Journal of KIISE:Information Networking
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• v.29 no.3
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• pp.205-215
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• 2002

In this paper the Dynamic Minislot Reservation Protocol(DMRP) in which the control channel is divided into contention-less and contention minislots in order to reduce re-transmission probability in multicasting is proposed. In the network, earth node has two pairs of transceivers. A transceiver consisting of a fixed transmitter and a fixed receiver is used to control packet registration and the other transceiver is used to transmit data. Two types f transceivers for data transmission are considered : one is FT-TR(Fixed Transmitter-Tunable Receiver) and the other is TT-TR(Tunable Transmitter-Tunable Receiver). In the analysis, FT-TR and TT-TR single-hop passive star networks are compared. As results, we conclude that the DMRP protocol with dynamically divided control channel has improved the system performance such as throughput and system delay regardless of traffic type or network structure.

• Journal of the Korea institute for structural maintenance and inspection
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• v.13 no.2 s.54
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• pp.172-180
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• 2009

Normally in order to build a semi-active control system equipped with MR damper, the dynamic modeling of the damper is required to numerically predict its dynamic damping force and also its behavioral characteristics. For the dynamic modeling of the MR damper, this paper attempts to predict and evaluate its dynamic behavior by applying specifically both a power model and a Bingham model. Dynamic loading tests were performed on the squeeze type of damper specially designed for this research, and force-displacement hysteresis loops confirmed the effectiveness of the damper as a semi-active control device. In the meantime, in order to evaluate the effectiveness of each model applied, the model parameter for each model was identified. On the basis of the parameter, we derived the error ratio of the force-velocity relationship curve and the dynamic damping force, which was contrasted and compared with the experimental results of the squeeze type of damper. Finally, the squeeze type of MR damper developed in this research was proved to be valid as a semi-active control device, and also the evaluation of the two dynamic models showed they were working fine so that they were likely to be easily utilized to numerically predict the dynamic characteristics of any dampers with MR fluid as well as the squeeze type of MR damper.

• Nuclear Engineering and Technology
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• v.27 no.5
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• pp.730-742
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• 1995

The steam generator feedwater and level control system is designed by two steps of the feedwater control design and the feedback loop controller design. The feedwater sen system is designed by the optimal LQR/LQG approach and then is modified by the LTR method to recover the robustness. The plant characteristics are subject to change with the power variation and these dynamic properties are considered in the design of the feedback controller. All the designs are made in the continuous domain and are digitalized by applying the proper sampling period. The system is simulated for the two cases of power increase and decrease. From the results of simulation, it is found that the controller constants would rather be invariable during the power increase, while for the case of power decrease they should be changed with the power variation to keep the system stability.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.5
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• pp.431-438
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• 2012

Non-linear turbojet engine controller with high operational performance has been designed for the high maneuverability UAV. The turbojet engine dynamic performance code has been developed to reflect the non-linear characteristics on controller design, by which the necessity of non-linear controller design was justified by investigating the limitation of linear model derived from the dynamic performance. The PI-like fuzzy controller was designed and enhanced by combining with conventional derivative control. This designed fuzzy controller proves its effectiveness by showing superior control performances over the conventional PID controller along with guaranteeing the safe operation within compressor surge, flame out and turbine temperature limits etc.

• Journal of Advanced Marine Engineering and Technology
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• v.36 no.1
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• pp.118-125
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• 2012

In this paper, an approach to designing controllers for the tension/movement control of working robot to install a stringing wire cable is presented. To design a controller, when the robot moves a certain distance maintaining constant tension, the dynamic model of a stringing wire cable which considers effects of weights according to changing lengths is presented. Also the tension at startup of the working robot is studied by numerical analysis which is based on the equation of the dynamic wire model. From the dynamic model for a stringing wire cable, working robot for tension/movement control is suggested and designed a feedforward controller with a accelerator gain to suppress a mutual interference of the both tasks of tension/movement control. Depending on the operating conditions of the working robot, the effectiveness of the suggested system has been verified by the simulation and experimental results.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.8
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• pp.1811-1817
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• 2014

In this paper, a PID controller with interpolated gains by use of neural networks is proposed for the formation control problem that following robots track a leading robot with constant distances and angles when there are changes in the mass of the following robot. The whole control system is composed of a kinematic controller and a dynamic controller considering the robot dynamics. The dynamic controller is the PID controller with varying gains, and the proper gains are obtained for some representative masses of the follower robot by the genetic algorithm. Neural networks is trained using the genetic algorithm with the gain data obtained in the previous step. The trained neural network determines optimal PID gains for a random mass of following robot. Simulation studies show that for arbitrary masses of the tracking robot, the PID controller with interpolated gains by the trained neural network has better tracking performance than that of the PID controller with fixed gains.