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ZigBee 무선표준을 이용한 상수도 원격검침 네트워크 구현
권종원(Jongwon Kwon),박용만(Yongman Park),오드게럴(Odgerel),김희식(Hiesik Kim) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
In this paper, authors realize water AMR(Automatic Meter Reading) network using low power Zig Bee protocol included routing ability for improving wireless communication error detection and network range. ZigBee wireless standard is an important standard of the field related Ubiquitous industry and recently has application to Home-Network. It's special features are to spend low power and to include routing ability each terminator. Because of these features, authors realize water AMR system on Embedded system using ZigBee protocol for applying to transfer data between a water meter and RF module equipped with a water meter in each house.
윤인철(In-Chul Yoon),권종원(Jongwon Kwon),박용만(Yongman Park),오드게럴(Odgerel),김희식(Hiesik Kim) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
This traveling wave tube amplifier maintenance system was developed for performance of microwave Surveillance radar traveling wave tube amplification parts, and field operation. The Maintenance system is traveling wave tube amplification part RF output waveform measurement and HVPS Voltage adjustment and a maintenance function are offer. The system was developed as an embedded system base it consisted of Linux os which applied a top-down design and visual technique Therefore change and easy extension of a system. This paper discussed characteristic of maintenance equipment function, composition, and an emplovment program.
오홍일(Heungil Oh),권종원(Jongwon Kwon),박용만(Yongman Park),오드게럴(Odgerel),김희식(Hiesik Kim) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
An efficiency improving method for Uninterruptible Power Supply System(UPS) was developed by using OP-AMP based application circuits such as voltage detection device, current detection device and static switch control device. The efficiency improving algorithm was made by mixing the operating concepts of On-Line type UPS with the operating concepts of Off-Line type UPS. The UPS' inverter does not work if the UPS' output load current is not higher than the low load operating current which is about 0~30(%) of the UPS' output load capacity. The low load operating current is adjustable within the half of the UPS' output load capacity. If the UPS' output load current is rising over than the low load operating current, the UPS' inverter starts working and the inverter output power feeds to the loads of UPS. If UPS' input power breaks out while UPS' inverter does not operate because the load current is low, the inverter starts working within 4(㎳) with excessive output voltage which is ±8(%) of normal UPS' output voltage. Like these, UPS can continuously feeds power to it's load device and reduce power consumptions.