• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2931-2934
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• 2003

This paper has been studied the electronic ballast by the self-oscillated inverter. The self-oscillated ballast can reduce the stress of the switch of the inverter. But the self-oscillating method is not easy to analyze and design. There arc three kinds of cores for the oscillating transformer： Ring core, EI-core, and Drum core. In this paper, we are studied the characteristics of three kinds of cores in using electronic ballast by the self-oscillated inverter.

• Proceedings of the KIEE Conference
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• 1996.07a
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• pp.619-621
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• 1996

This paper presents the study on the development of the power factor correction convener with ZVT Boost converter, which is better than the conventional PWM Boost converter to increase the switching frequency for high density and lower stress of switch. A simple DC and small signal model for the power factor correction converter with constant switching frequency is derived. The guide line for design of controller is summarized.

• Management & Information Systems Review
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• v.2
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• pp.335-354
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• 1998

In this study I construct CAN(Controller Area Network) for automobiles similar to LAN(Local Area Network) and build communication modules in the major part of an automobile to link several sub-systems. Since each station replaces the communication function of sub-systems and has various types of sensor, actuator, controller, and switch, every information about automobile's status is obtained from the network. The manufactured system showed a superior capability. The following is the contents of study. 1. The definition of communication packet through the analysis of CAN protocol. 2. The Design of modules using micro-controller 80C196CA. 3. The Network configuration.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.735-739
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• 2002

PTB(Power Transfer Breaker) is a device which incorporate the functions of ACB(Air Circuit Breaker) and ATS(Automatic Transfer Switch). ACB is a circuit breaker against overload and ATS is a switching device to transfer the load between two electric power sources. An existing PTB design based upon the 5 bar & cam mechanism has been regarded to be too complex and thus a simpler 4 bar mechanism with trigger lock is proposed. Experimentation and optimization of the trigger lock is presented.

• Proceedings of the Acoustical Society of Korea Conference
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• 1998.06c
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• pp.339-342
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• 1998

The various services that a broadband integrated services digital network (B-ISDN) carries, have a wide range of delay, delay jitter and cell loss probability requirements. Design of appropriate control schemes for B-ISDN is an extremely important and challenging problem. In this paper, we proposes a priority control scheme with a delay counter and a cell counter per each class type. The priority control for required service quality is performed with delay/loss factor obstained by comparing window counter with cell counter. The performance of proposed control scheme is estimated by computer simulation.

• Proceedings of the KIEE Conference
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• 2008.09a
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• pp.47-51
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• 2008

Computer and communication of based IT technology use to das that remote control, monitoring, measuring automation gas switch, recloser totaled far about $20{\sim}30km$. For increasing efficiency billing, metering of high voltage customer use to amr system. If between das and amr interface operate when generated fault in high voltage electric equipment of customer part, amr system serve to das quickly in fault information data, correct fault location.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.400-403
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• 2000

This paper deals with the active clamp ZVS flyback converter for semiconductor plasma etching system. The proposed converter has the characteristics of the good power facter low switching noise and efficiency improvement. The characteristics are verified through simulation results. Furthermore the ringing effect due to output capacitance of the main switch can be eliminated by use of active clamp circuit.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1150-1153
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• 1992

A new soft-switching resonant type inverter is proposed to obtain the low voltage stress. In this proposed inverter, only one additional switch is used for the soft commutation. Therefore, a simple structure and a easy control can be available. Moreover, the PWM capability can be highly improved due to tile convenient choice of switching condition. Based on the operational principle, analysis and design procedures are described. Through the simulation, the operation of the proposed invertor is verified.

• Journal of Biomedical Engineering Research
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• v.2 no.1
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• pp.55-64
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• 1981

The important parameters of DC amplifier, which is widely use4 for the medical and engineering fields, are input offset voltage and temperature drift. Chopping amplifier reduces approximately 10% the parameters changing than monolithic operational amplifier. In this study, a chopping amplifier with semiconductor chopper is designed and tested, this chopper is realized by CMOS analog switch and timing circuits. The test results approve that designed amplifier is suitable for precision instrument DC amplifier.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.3031-3033
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• 2005

High speed PC-based digital I/O system hardware, PCI-bus master and slave set is developed, which features are distributed structure, input/output function interchangeability by switch setting, high speed 20Mbps to update 1000 points in less than 1 ms, etc.