• The Transactions of the Korean Institute of Electrical Engineers C
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• v.49 no.9
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• pp.541-545
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• 2000

We propose a pulsed $CO_2$laser below 30W by the AC(60Hz) switching control of leakage transformer primary which has some advantages of cost and size compared to a typical pulsed power supply. Pulse repetition rate is adjusted from 5 Hz to 60 to Hz control laser output. In this laser a low voltage open loop control for high voltage pulse discharge circuit is employed to aviod the Hv sampling or switching and high voltage leakage transformer is used to convert low voltage pulse rectified from AC to high voltage one. A ZCS(Zero Crossing Switch) circuit and a PIC(programble one-chip microprocessor are used to control gate signal of SCR precisely. The pulse repetition rate is limited by 60Hz due to the frequency of AC line and a high leadkage inductance. The maximum laser output was about 23 W at pulse repetition rate of 60Hz total gas mixture of $CO_2$ : $N_2$ : He=1: 9: 15 and total pressure of 18 Torr

• Journal of Ocean Engineering and Technology
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• v.10 no.3
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• pp.162-167
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• 1996

This paper deals with an implementation method for the one chip microprocessor(8097)-based capacitance type wave recorder for a measuring real-time wave height. The system was developed to make it possible to real-time remote sensing the wave height by deploying the RS-232/422/485 communication methods. The system test results for the developed system such as linearity, system stability and robustness of the disturbance was also verified through the performance tests of the system. Furthermore, the system was developed after due consideration with connecting the public network such as satellite mobile communication system and LAN, through the deploying VLSI(Very Large Scale Integration) design techniques.

• Journal of the Korean Institute of Telematics and Electronics
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• v.16 no.6
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• pp.40-47
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• 1979

In the recent developent of D-4 Channel Bank which is the basic PCM multiplex terminal, we utilized the one-chip microprocessor in the design of the Alarm and Trunk processing unit besides we could add more flexible functions, we simplified the logic circuits and the discrete parts. Since in Korea, we are lacking in the semiconductor technology, the microprocessor applications in the communication systems desist give us the meaningful advantages in the a aspects of economy, reliability and new technology.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.857-862
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• 2003

In this paper, we concern for development of precise measuement system for civil structure by using one chip microprocessor based on communication system. The datalogger is developed by using 80C196KC microprocessor. It has RF communication modul and data acquisition function for several kinds of sensors such as load cell, tilt-meter, strain gauge, tension meter, themocouple and so on. The data is acquisited by datalogger is sent to a main server which is located at central monitoring office. The server has a function suppervising several data points located at civil structures, it analyzes the data and shows the data graphically. The effectiveness of the developed system is proven through experimental results by an application for the bridge of Nakdong river edge in Busan, Korea.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.143-146
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• 1999

A method to control the speed of DC motor with one-chip microprocessor PIC using PWM is discussed in this paper. This thesis deals with the DC motor speed control for electric bicycles which may be used as an alternative means of transformation in the future. We tried to design a stable system for controlling the speed of DC motor and materialized an electric bicycle loading this system. Now we are on the way to find out the problems this system has and work out the solutions.

• KIEE International Transactions on Electrophysics and Applications
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• v.3C no.4
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• pp.155-160
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• 2003

In this study, an Alexandrite laser system for hair removal adopting a multi-discharge method in which three flash lamps are turned on consecutively was designed and fabricated to examine the pulse width and the pulse shape of the laser beams depending upon the changes in the lamp turn-on time. Specifically, this study demonstrates a technology that makes it possible to formulate various pulse shapes by turning on three flashlamps consecutively on a real-time basis with the aid of a PIC (program integrated circuit) one-chip microprocessor. With this technique, the lamp turn-on delay time can be varied more diversely from 0 to 10 ms and real-time control is possible with an external keyboard, enabling an assortment of pulse shapes. In addition, longer pulses can be more widely used for industrial processing as well as for numerous medical purposes.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.51 no.2
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• pp.55-60
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• 2002

This paper presents a controller for the multiple DC motors using the CAN(Controller Area Network). The controller has a benefit of reducing the cable connections and making the controller boards compact through the network including expansibility. CAN, among the field buses, is a serial communication methodology which has the physical layer and the data link layer in the ISO's OSI (Open System Interconnect) 7 layered reference model. It provides the user with many powerful features including multi-master functionality and the ability to broadcast / multicast telegrams. When we use a microprocessor chip embedding the CAN function, the system becomes more economical and reliable to react shortly in the data transmission. The controller, we proposed, is composed of two main controllers and a sub controller, which have built with a one-chip microprocessor having CAN function. The sub controller is plugged into the Pentium PC to perform a CAN communication, and connected to the main controllers via the CAN. Main controllers are responsible for controlling two motors respectively. Totally four motors, actuators for the biped robot in our laboratory, are controlled in the experiment. We show that the four motors are controlled properly to actuate the biped robot through the network in real time.

• Proceedings of the KIEE Conference
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• 1991.11a
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• pp.219-222
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• 1991

It is difficult to adapt modern control theory to power conversion system for the price of real time control H/W and the difficulty of S/W implementation. But recent development of large integrated circuit make it possible that One-Chip microprocessor processes high speed arithmatic calculation used in control theory. Specially this chip is called Digital Signal Processing chip. So, this research developes high performance, high reliable digital control system using TMS320C30 of Texas Instrument for real time control in power conversion system.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10a
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• pp.292-298
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• 1991

A new 6-axis robot controller with a high-speed 32-bit floating-point DSP TMS32OC30 has been developed in Samsung Electronics. The controller composed of Intel 80386 microprocessor for the main controller, and TKS32OC30 DSP chip for joint position controller. The characteristics of the controller are high sampling rate of 200us and fast reponsibility. The main controller supports MS-DOS, kinematics, trajectory planning, and sensor fusion functions which are vision, PLC, and MAP. The one high speed DSP chip is used for controlling 6 axes of a robot in 200us simultaneously. The control law applied is PID controller including a velocity feedforvard in joint position controller. The performance tests, such as command following, CP, were conducted for the controller integrated with a 6 axes robot developed in Samsung Electronics. The results showed a good performance. This controller can also perform the system control with other controllers, the communication with high priority controllers, and visual information processing.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10a
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• pp.758-761
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• 1991

Using one chip microcontroller 87Cl96 (On chip EPROM type) and EPLD (Erasable & Programable Logic Device), an implantable control system to drive pendulum type electromechanical total artificial heart was developed. This control system consists of 4 parts, main management system, motor driver with power regulator, state monitoring system and communication part. The main system has the functions for speed detection, PI(proportional and integration) control, PWM generation, communication and analog data processor. Two kinds of power system were used and separated by 8 photo coupler arrays to improve the system stability. The performances of each compartments were compared with our previous z80 microprocessor based control system and good correspondences was shown. Logic power consumption was reduced to a one third of our previous controller. Using mock circulation tests, the overall performances of control system are evaluated.