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홍철호,김정도 호서대학교 공업기술연구소 1997 공업기술연구 논문집 Vol.16 No.1
This paper presents a module neural controller, which has a pattern recognition capability to obtain ofast convergence speed for learning procedure. Since input patterns of adjacent time are almost the same, we regard it as the same patterns and learn it at each module network. This neural controller is composed of several module at output layer. The actual experiments with DC servo motor have shown the effectiveness of the proposed module neural network
로봇의 실수형 유전알고리듬을 이용한 Takagi and Sugeno형 퍼지제어기 설계
홍철호,정영창,김정도 호서대학교 공업기술연구소 1998 공업기술연구 논문집 Vol.17 No.1
This paper proposes to design fuzzy optimal controller of robot manipulator using decim al-type genetic alg orithm . In this paper fuzzy inference apply Takag i and Sugenome thodin fuzzy controller and decide param eters in the consequences proposes method for using Decimal- ty p e G enetic algorithm . In simulation it com pares cases that Robot man ipulator is connected one fuzzy controller and three fu zzy controller. In the consequence it com pares cases that in clu de B ias and not include Bias. So the simulation proves effectiveness of this fuzzy optimal controller of robot manipulator using decimal-type genetic algorithm .
LQG/LTR을 이용한 DC 전동기 속도 제어 시뮬레이션
홍철호 호서대학교 공업기술연구소 1997 공업기술연구 논문집 Vol.16 No.1
In this paper, presented are the simulation results of a LQG/LTR controller ior a DC motor. The condition for energy saving concept as well as robust stability and tracking is incoporated in the design cost function. Frequency response analysis showed that the designed controller is very robust to modelling errors including external disturbances. Simulation results demonstrated that the proposed loop is better than conventional PID controller in that the proposed controller follows input command more quickly and consumes less energy.
LQG/LTR을 이용한 DC 전동기 속도 제어 시뮬레이션
홍철호 湖西大學校工業技術硏究所 1997 工業技術硏究所論文集 Vol.16 No.-
In this paper, presented are the simulation results of a LQG/LTR controller for a DC motor. The condition for energy saving concept as well as robust stability and tracking is incoporated in the design cost function. Frequency response analysis showed that the designed controller is very robust to modelling errors including external disturbances. Simulation results demonstrated that the proposed loop is better than conventional PID controller in that the proposed controller follows input command more quickly and consumes less energy.
홍철호,김동진,이장훈,권혁구 한국환경독성학회 2004 환경독성보건학회지 Vol.19 No.1
Air quality monitoring is a primary activity for industrial and social environment. The government push for pollutants that must be monitored. Especially, the VOCs(Volatile Organic Compounds), which are very harmful for human and environment, should be controlled under the government policy. We have been developed a VOCs measurement system which recognize various kinds and quantities of VOCs, such as benzene, toluene, and xylene(BTX). Especially, we designed sensor array with various kinds of gas sensor and ANN(Artificial Neural Network) algorithm. The measured values for BTX have errors of 1~4ppm.
New Hypervisor Improving Network Performance for Multi-core CE Devices
홍철호,유시환,유혁,Miri Park 대한임베디드공학회 2011 대한임베디드공학회논문지 Vol.6 No.4
Recently, system virtualization has been applied to consumer electronics (CE) such as smart mobile phones. Although multi-core processors have become a viable solution for complex applications of consumer electronics, the issue of utilizing multi-core resources in the virtualization layer has not been researched sufficiently. In this paper, we present a new hypervisor design and implementation for multi-core CE devices. We concretely describe virtualization methods for a multi-core processor and multi-core-related subsystems. We also analyze bottlenecks of network performance in a virtualization environment that supports multimedia applications and propose an efficient virtual interrupt distributor. Our new multi-core hypervisor improves network performance by 5.5 times as compared to a hypervisor without the virtual interrupt distributor.
Lyapunov 제2방법에 의한 로보트 머니플레이터의 적응제어
홍철호,이택종 成均館大學校 科學技術硏究所 1989 論文集 Vol.40 No.1
본 논문에서는 머니플레이터의 nominal제이에 근거를 둔 기준 모델 추종 적응제어기법(Adaptive model following control)을 제안한다. 기준 모델은 머니플레이터의 Nominal 값들을 사용하여 머니플레이터의 모델과 유사한 비선형커플링 시스템으로 표현하며 로봇 머니플레이터가 미리 계획된 궤적을 최대한 근접하게 추종하도록 비선형 보상과 Lyapunov 제 2방법에 의해 대국적으로 점근안정하도록 구현된다. 제안된 제어칙(Control law)은 컴퓨터모사를 통해 그 성능의 효용성을 입증된다. This paper proposed AMFC based on nominal control scheme of a robot manipulator. Reference model is represented by a nonlinear coupled robot manipulator using its nominal values. Control lane is developed for the manipulator to track a preplanned trajectory as closely as possible and is designed to assure globally asymptotic suability via the second method of Lyapunov. The performance validity of the proposed control law is verified by computer simulation.