• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.865-870
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• 2001

For pneumatic system control, we need a data transmission system with high speed and high reliability or information interchange between main computer and solenoid valves and I/O devices. This paper presents a set of design techniques for a data communication system that is mainly used for pneumatic system control. For this purpose, we first designed hardware modules for an interface between central control module and local node that handles the operation of solenoid valves. In addition we developed a communication protocol for construction of RS-485 based multidrop network, and this protocol is basically designed with a kind of polling technique. Finally we evaluated performance of the developed system. The field test results show that, even under high noise environment, the data transmission of 375Kbps rate is possible up to 1,000m without using repeater. In addition, the system developed in this research is proved to be used easily for extension of a communication network because of its module structure.

• KEPCO Journal on Electric Power and Energy
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• 제6권4호
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• pp.405-411
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• 2020

In this paper, we designed the COS MEMS system for sensing the falling detection and explosive noise of fuse link in COS (Cut Out Switch) installing on the power distribution. This system analyzed the failure characteristics and an instantaneous breakdown of power distribution. Therefore, our system strengths the industrial competence and guaranties the stable power supply. In this paper, we applied BLE (Bluetooth Low Energy) technology which is suitable protocol for low data rate, low power consumption and low-cost sensor applications. We experimented with LSM6DSOX which is system-in-module featuring 3 axis digital accelerometer and gyroscope boosting in high-performance mode and enabling always-on low-power features for an optimal motion for the COS fuse holder. Also, we used the MP34DT05-A for gathering an ultra-compact, low power, omnidirectional, digital MEMS microphone built with a capacitive sensing element and an IC interface. The proposed COS MEMS system is developed based on nRF52 SoC (System on Chip), and contained a 3-axis digital accelerometer, a digital microphone, and a SD card. In this paper of experiment steps, we analyzed the performance of COS MEMS system with gathering the accelerometer raw data and the PDM (Pulse Data Modulation) data of MEMS microphone for broadcasting the failure of COS status.

• 한국전자통신학회논문지
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• 제14권1호
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• pp.161-168
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• 2019

오늘날 탄소 및 배기가스 저감을 위한 해결책으로 전기자동차의 개발 및 보급이 증가하고 있다. 국내에서는 환경부 주관으로 전기 자동차의 보급과 충전기의 확충이 해마다 빠른 속도로 증가하고 있다. 본 논문에서는 전기 자동차 충전기의 보급과정에서 필연적으로 나타나는 고장에 관한 문제를 해결하기 위하여 전기 자동차 및 충전기 양쪽의 충전관련 고장에 대한 신속한 점검을 가능하게 하는 휴대용 스마트 시험 기술에 대하여 연구하였다. 전기 자동차 및 충전기 간의 통신 프로토콜의 정상동작을 검증하기 위해 하드웨어 모듈과 소프트웨어를 구성하였으며, V2G 기술까지 고려된 국제 표준규격에 기반을 둔 휴대용 시험기를 개발하여 시험 평가하였다.