• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.5
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• pp.625-632
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• 2014

It is required a lot of strength in aquaculture, such as dragging up or moving heavy loads. So, a helper system like excavator at construction is need for fishermen. As most of HFMSC(Hydraulic Fishery Managing Small Crane)s are operated based on ON/OFF control, it can make sway the contents in the crane. In worse case, it could threaten workers. In this paper, we development the MICOM based controller which can reduce the swing sway. This paper describes the hydraulic characteristics, the design method of controller and the control algorithms. And, the proposed controller show the efficiency to carry out the experimental validation.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.34 no.1
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• pp.1-9
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• 1985

In this study we described Binary-Decision Method Programmable Controller that is faster than conventional Programmable Controller (P.C) using the Boolean method. An algorithm for the optimal BD program was systematically developed by using the incomplete multiple output function and the residual characteristic function. The potential applications of BD programmable controller for the problems of industrial control were illustrated, which include on-off sequential control function and also the tasks involving continuous data processing and PID control. An example was presented that has shown how BD programmable controller and ICU (Industrial Control Unit) controller can be applied to the sequential logics.

• Journal of Mechanical Science and Technology
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• v.19 no.2
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• pp.529-539
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• 2005

The development of a fast, accurate, and inexpensive position-controlled pneumatic actuator that may be applied to various practical positioning applications with various external loads is described in this paper. A novel modified pulse-width modulation (MPWM) valve pulsing algorithm allows on/off solenoid valves to be used in place of costly servo valves. A comparison between the system response of the standard PWM technique and that of the modified PWM technique shows that the performance of the proposed technique was significantly increased. A state-feedback controller with position, velocity and acceleration feedback was successfully implemented as a continuous controller. A switching algorithm for control parameters using a learning vector quantization neural network (LVQNN) has newly proposed, which classifies the external load of the pneumatic actuator. The effectiveness of this proposed control algorithm with smooth switching control has been demonstrated through experiments with various external loads.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1012-1017
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• 2003

The development of a fast, accurate, and inexpensive position-controlled pneumatic actuator that may be applied to a variety of practical positioning applications with various external loads is described in this paper. A novel modified pulso width modulation (MPWM) valve pulsing algorithm allows on/off solenoid valves to be used in place of costly servo valves. A comparison between the system response of standard PWM technique and that of the novel modified PWM technique shows that the control performance is significantly increased. A state feedback controller with position, velocity and acceleration feedback is successfully implemented as the continuous controller. Switching algorithm of control parameter using learning vector quantization neural network (LVQNN) is newly proposed. which estimates the external loads of the pneumatic actuator. The effectiveness of the proposed control algorithms are demonstrated through experiments with various loads.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.727-730
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• 2009

유비쿼터스는 어떤 기기나 사물에 컴퓨터 칩을 내장시켜 각 사물들이 컴퓨터네트워크에 접속되어 통신을 가능하도록 해주는 정보 기술(IT ; Information Technology)을 총칭하는 것으로, 유비쿼터스 환경이란 결국 사물들의 네트워크를 의미한다. 막연한 유비쿼터스를 보다 현실성 있게 접근 할 수 있도록 휴대폰의 SMS기능을 활용한 "제어기(Controller)"를 설계하고 시험 하였다. 사용자가 휴대폰의 문자 메시지(SMS) 신호를 제어기의 중앙처리장치에 전달하고 이 신호를 처리해서 Relay를 ON/OFF 할 수 있도록 구성 되어 Relay에 연결된 외부기기 즉, 조명, 선풍기, 히터 등 가전기기 등의 전원을 ON/OFF한다. 이를 통해서 일반인들도 간단하고 쉽게 원격제어를 체험 할 수 있고 원한다면 얼마든지 다양한 종류의 전기기기 제어를 할 수 있다.

• Journal of Advanced Marine Engineering and Technology
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• v.23 no.2
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• pp.236-243
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• 1999

This study deals with the application of high speed on-off valves to an electro-hydraulic servo indexing system incorporated electro-hydraulic servo valces. Comparing with the electro-hydraulic servo valve the high speed on-off valve has some merits. Which included low price robustness to the oil contamination and dircect control without D/A converter. The considered sys-tem of this study is controlled by pulse width modulation(PWM) of the control law which is pro-duced by a PID controller which is used broadly in industrial equipments. The dynamic character-istics corresponding to variations of system parameters such as inertia moment system gain and supply pressure are investigated by computer simulation and experiment. Consequently the availability of the application of high speed on-off valve to servo indexing system instead of electro-hydraulic servo valve is confirmed.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2001.10a
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• pp.417-420
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• 2001

The monitoring system for maintaining on-site wastewater treatment plants(Biofilter) was developed. Proposed system applied PLC(Programmable Logic Controller) technique. In process of development, the research against the monitoring parameters which will be able to represent condition and operation of the plants was accomplished. These parameters are ORP(Oxidation-Reduction Potential), Water Level, Pump and Power on/off. Also, to measure, collect, transfer and display these parameters, DMU(Data Measurement Unit), MCU(Main Controller Unit) and Display Board were produced.

• Journal of Biosystems Engineering
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• v.23 no.6
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• pp.599-606
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• 1998

This study was carried out to develop the control system with PLC and its operating software and to investigate its control ability of greenhouse environments. Two experimental greenhouses were controlled by PLC and ON/OFF controller, respectively. In greenhouse controlled by PLC, target values of air temperature, relative humidity and $CO_2$ concentration were automatically changed. In warm-water heating, the variation of air temperature was reduced to $\pm$ $0.6^{\circ}C$ by the method of proportional-integration(PI) control with an inverter. In ventilation, the variation of air temperature was reduced, since windows open and close with multistage by mutual relation formula among the target, indoor, and outdoor temperature. Relative humidity at daytime was maintained with range of 35% to 55% by PLC controlled fogger. $CO_2$ concentration was automatically controlled from 300 to 800 $\mu$molㆍ$mol^{-1}$ according to amount of solar radiation. The suppling amount and frequency of nutrient solution were controlled by total integrated solar radiation. Difference in the yield of cucumber in the greenhouse controlled by PLC and by ON/OFF controller was not significant at the 5% level.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.22 no.4
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• pp.75-80
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• 2014

A lunar lander demonstrator developed for the purpose of demonstrating lunar landing technologies recently in Korea. The thruster control system of the lunar lander demonstrator adopted the main thrusters for altitude control and the reaction thrusters for attitude control. In this paper, we propose a path tracking controller base on Euler angles. The control signals of the controller are of continuous type. And Pulse Width Modulator(PWM) is adopted to provide On/Off signals. We perform MATLAB simulation for evaluating the path tracking performance and the final landing velocity of the lunar lander demonstrator.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.1736-1740
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• 2003

POSCO Kwang-Yang Works #2 Cold Rolling Mill RCL has the main hydraulic system that controlled on/off control method. In the aspect of the consumption of electrical energy this system has some problem. So, we present a continuous control method instead of on/off control method that controls the pressure of main hydraulic system with saving the electric energy.