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신재생에너지시스템을 위한 공통접지가 있는 고승압 DC-DC 컨버터
문은아 ( Eun-ah Moon ),이나원 ( Na-won Lee ) 조선대학교 공학기술연구원 2022 공학기술논문지 Vol.15 No.1
A high step-up gain DC-DC converter with a single switch is introduced in this paper. The introduced DC-DC converter can provide the common ground between renewable energy sources and the negative side of the output load. The extension of an introduced DC-DC converter is also presented to provide the high voltage gain. In addition, the voltage stresses across the devices of the introduced DC-DC converter are still low. The theoretical analysis and a comparison considering other converters previously published in the literature are presented in the paper. In order to validate the introduced DC-DC converter characteristic, a simulation and prototype have been built with a power rating of 450 W.
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IoT 환경을 위한 Local WAS에서 디바이스 이질성을 줄이는 독립적인 Firmware 설계
이경호(Kyung-Ho Lee),문은아(Eun-Ah Moon) 한국전자통신학회 2023 한국전자통신학회 논문지 Vol.18 No.5
IoT 산업은 매년 기록적인 성장률을 기록하며 성장하고 있으나 IoT 플랫폼을 개발하는데 앞서 개발자들은 보안, 데이터 저장, 디바이스간 이질성 등의 현실적인 문제들에 직면하게 된다. 특히 디바이스간 이질성은 네트워크 유형과 프로토콜로 발생하는데, 다비이스 Firmware를 변경하거나 경우에 따라서는 여러 개의 IoT 플랫폼을 사용해야 한다. 또한 무분별한 IoT 디바이스가 넘처나면서 중복된 센싱으로 데이터가 낭비되기도 한다. 본 논문에서는 Local WAS가 MQTT 프로토콜을 사용하는 IoT 플랫폼 환경에서 디바이스간 이질성 해결을 위한 디바이스 독립적인 Firmware 설계를 제안하고자 한다. The IoT industry is growing at a record growth rate every year, but developers face practical problems such as security, data storage, and heterogeneity between devices before developing an IoT platform. In particular, heterogeneity between devices occurs due to network type and protocol, and device firmware must be changed or multiple IoT platforms must be used in some cases. In addition, data is wasted due to redundant sensing due to the overflow of indiscriminate IoT devices. In this paper, we propose a device-independent firmware design to solve the heterogeneity between devices in the IoT platform environment where Local WAS uses the MQTT protocol.
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정병호(Byeong-Ho Jeong),이강연(Kang-Yoen Lee),박주훈(Ju-Hoon Park),문은아(Eun-Ah Moon),이상현(Sang-Hyun Lee),김대곤(Dae-Gon Kim) 대한전기학회 2012 전기학회논문지 P Vol.61 No.2
CPV system in the desert areas or areas near the equator, as is suitable for high-temperature region. As compared to silicon solar cells, CPV system have a high proportion of a BOS (balance of system). Solar cells because of its low proportion when designing a module technology is applied in a variety of ways. Applied to the CPV system is classified into two kinds of optical technology. One of those using fresnel lens uses refraction of light energy. The other is a mirror reflection of the structure using sprays. Both of these two ways to condense the sun to collect solar cell is a form of light. And goals by using a small solar cell materials is to produce more energy. In this paper, suitable for a domestic environment, with the aim CPV Manufacturing Technology, built on a variety of modular process technology to the development of a prototype performance analysis was carried out. In particular, silicone coated on the glass by the method oi implementation of the Fresnel lens SOG(Silicon on glass) by applying the lens to absorb the solar spectrum was broad. In addition to, for the analyze to characteristics of the CPV module, developed CPV module performance and generating characteristics studied. These related technology through research and development of high-performance multi-junction solar cells, modules, development of concentrating solar power systems to facilitate the growth of the market is considered to be.
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