• 제어로봇시스템학회:학술대회논문집
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• 1989.10a
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• pp.402-406
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• 1989

Since the control parameters of classical PID controller are fixed for all control period, it is not easy to produce a desired transition phenomena. We incorporate an iterative learning scheme to the linear controller so that it has more flexibility and adaptation capability especially in the transition period. In this paper a hybrid type learning controller is proposed in which fixed linear controller guides learning at the beginning stage. Once a perfect learning is achieved, then the control action is performed by only the learning controller. A computer simulation result demonstrates better performance during transition time than that with only linear PD controller.

• 제어로봇시스템학회:학술대회논문집
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• 1989.10a
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• pp.244-249
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• 1989

For the robot manipulator in performing precision tasks, it is indispensable that the robot utilize the various sensors for intelligence. In this paper, the hybrid position/force control method is implemented with a force/torque sensor, two personal computers, and a PUMA 560 manipulator. Two application S/W packages for edge following and peg-in-hole tasks are developed by the proposed force control algorithm. The related experimental results are then presented and discussed,

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.3-4
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• 2000

본 논문에서는 다양한 QoS와 전송률을 갖는 WCDMA 시스템에 복합간섭제거기법을 적용하여 그 성능을 분석하였다. 전송률이 높은 사용자들은 병렬간섭제거기법이나 복합간섭제거기법을 사용하여 간섭을 제거하는 것이 효과적이며, 전송률이 낮은 사용자들은 순차간섭제거기법이나 복합간섭제거기법을 사용하는 게 효과적이다. 그러나, 순차 및 병렬간섭제거기법과 비교해 본 결과 QoS와 전송률에 관계없이 복합간섭제거기법의 성능이 가장 우수함을 알 수 있었다.

• 제어로봇시스템학회:학술대회논문집
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• 1987.10b
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• pp.312-316
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• 1987

A simple hybrid circuit to control the two-phase AC motor of the nut-runners which employ the tightening torque control system is described in this paper. The circuit has emphasis on the low-cost implementation. The circuit constitutes of the V/F converter using a timer IC, the pulse width modulator using the fastening torque signal and the two-phase logic sequencer.

• 제어로봇시스템학회:학술대회논문집
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• 1987.10b
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• pp.578-581
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• 1987

하이브리드 스텝 모터와 같은 소형 정밀 모터에서 이를 설계 제작하는 과정에서 가공기술의 부족과 높은 생산 단가로 인하여 모든 부분의 가공에 높은 정밀도를 유지하기는 어렵다. 그러므로 토오크 특성에 영향을 많이 미치는 부위의 가공 정밀도를 향상시킴으로써 생산 단가를 줄일 수 있다. 하이브리드 스텝, 모터에서 구조상의 오차는 모터의 PERMEANCE를 변화시키고 PERMEANCE의 변화는 이와 직접적인 관련을 갖고 있는 토오크를 변화시켜서 결국에는 스텝 모터의 가장 중용한 요소인 정확한 위치 제어를 할 수 없게 된다. 모터의 구조적 결함에 대하여 알아보고 이 과정을 통하여 구한 HOLDING 토오크 값으로부터 정상인 때와 구조적인 오차가 있는 경우에 대한 토오크의 최대치와 DETENT 위치를 서로 비교함으로써 오차에 대한 토오크의 영향을 해석한다.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.225-225
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• 2000

We propose the hybrid robust controller for TDC(Time Delay Control) and SMC(Sliding Mode Control) method. TDC and SMC deal with the time-varying system parameters, unknown dynamics and unexpected disturbance. This controller is applied to follow the desired reference model for the uncertain time-varying overhead crane. The control performance is evaluated through simulation. The theoretical results indicate That the proposed controller shows excellent performance to an overhead crane with the uncertain time-varying parameters and disturbance.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.287-287
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• 2000

As a method to control the bacteria number in adequate level, a real time control system based on microscope image processing measurement for the bacteria is adopted. For the experiment, Ammonia-oxidizing bacteria such as Acinetobacter sp. are used. This paper proposed hybrid method combined watershed algorithm with adaptive automatic thresholding method to enhance segmentation efficiency of overlapped image. Experiments was done to show the effectiveness of the proposed method compared to traditional Otsu's method, Otsu's method with adaptive automatic thresholding method and human visual method.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.3
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• pp.731-736
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• 1996

In this paper, we propose a modified Type-II HARQ system having adaptive power to channel and analyze its performance in terms of throughput and reliability. Its performance is also compared with Typd-I and Type-II HARQ ystems and is verified using computer simulations over AWGN and frequenyc-nonselective, slowly Rayleigh fading channels.

• Electrical & Electronic Materials
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• v.11 no.11
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• pp.53-65
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• 1998

Planar lightwave circuits (PLCs) provide various important devices for optical wavelength division multiplexing (WDM) systems, subscriber networks and etc. This paper reviews the recent progress and future prospects of PLC technologies including arrayed-waveguide grating multiplexers, optical add/drop multiplexers, programmable dispersion equalizers and hybrid optoelectronics integration technologies.

• Proceedings of the KIEE Conference
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• 1998.07b
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• pp.712-714
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• 1998

Fuel cell systems offer high energy efficiencies for transportation application. In addition, they can use alcohols and alternative fuels as the fuel, while producing little or no noxious emissions. Fuel cell-powered vehicles should be competitive in performance characteristics and in capital and maintenance costs with internal combustion engine vehicles. The objective of the present study is to design a fuelcell/battery powered vehicles to analyze technical feasibity.