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Development of EIS Evaluation Method about PEMFC 1kW STACK
박찬엄(Park, Chaneom),한운기(Han, Woonki),정진수(Jung, Jinsu),고원식(Ko, Wonsik) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Electrochemical impedance spectroscopy(EIS) are using widely as a useful technique mainly in the field of electrochemical for the analysis of electrode reactions or characteristics of the composites. The response analysis of the systems technique provides comprehensive informations about the characteristic and structure of complex and internal reaction. The EIS is the method to measure impedance of the measurement target classified by the frequency, it select the equivalent impedance model to give same response from the result and it calculate the parameter. Therefore, the chemical reaction inside the fuel cell is to modeling to electrical impedance. And as repeating the same experiment in each of the operating point, we can get each different parameter. As a result, we can establish the equivalent impedance model in each operating point. Therefore, if we use these models, we can evaluate the fuel cell without the internal design parameter of the fuel cell as required in existing modeling. The EIS is used typically technique for distinguish status of fuel cell called SOH(State Of Health). When the fuel cell is degradation, Efficiency and health of the fuel cell is reduced because internal impedance is increase. As usage of these principles, we can evaluate state of fuel cell through the impedance analysis of fuel cells. In this study, we are presents EIS distinction system and algorithm for residential fuel cell systems. At the time of the fuel cell installation in the fields, the EIS system and proposed algorithm will be able to apply as technique for efficiency and performance evaluation about fuel cell system.
개방형 혼합 네트워크를 이용한 저전력 멀티-홉 네트워크 프로토콜
강정훈(Jeonghoon Kang),유준재(Junejae Yoo),임호정(Hojung Lim),박용국(Yongkook Park),이민구(Mingoo Lee),고원식(Wonsik Ko),김동익(Dongik Kim) 한국정보과학회 2010 한국정보과학회 학술발표논문집 Vol.37 No.1D
HONS(Hybrid Open Networking Stack) 는 다양한 무선 센서들을 하나의 네트워크로 서비스할 수 있는 시스템이다. IEEE 802.15.4 표준의 Open 패킷 구조를 정의하여, 다양한 센서를 저전력 멀티-홉 네트워크로 구성할 수 있다. HONS 네트워크는 라우터와 무선 센서로 구성된다. 라우터는 전원을 사용하여 멀티-홉 네트워크의 기본 백본을 형성하며, 무선 센서는 배터리로 저전력 동작을 하여, 라우터가 구성하는 멀티-홉 네트워크에 참여한다.