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맴리스터 기반 가스 센서 소자의 빠른 회복 및 상온 가스 센싱 특성 연구
이두원(Doowon Lee),정진수(Jinsu Jung),배동주(Dongjoo Bae),김희동(Hee-Dong Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
최근, NO 가스 검출을 위한, 가스 센서 소자의 빠른 회복, 고감도, 높은 선택 특성은 환경 모니터링, 진단 및 인공지능 분야에서 요구되는 필수 조건이다. 그러나 기존 반도체형 가스센서는 회복속도가 느리고, 낮은 감도, 높은 동작 온도 특성으로 인해, 특성 개선에 한계가 있다. 본 논문에서는, 맴리스터 기반의 가스센서, 즉 Gasistor (Gas sensor + Memristor) 소자를 이용한 NO 가스 센서를 제안하며, 제안된 소자의 가스센싱 및 회복 특성을 고보한다. 실험결과, NO, O2, C2H6 가스에 대해 상온에서 빠른 반응/복구(〈1s/70ns)의 실현 가능성을 성공적으로 입증했다.
Development of Electrical Safety Evaluation Method about PEMFC 1kW
한운기(Han, Woonki),박찬엄(Park, Chaneum),정진수(Jung, Jinsu),고원식(Ko, Woonsik) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Fuel cell systems are a completely different form of electricity source that has been used so far and is an aggregation of multiple technologies with multidisciplinary features that can be operated safely only when gas and electrical safety are being considered. Since fuel cells generate through electrochemical reactions there are difficulties in ensuring electricity safety, power quality assessment, effective control and reliability standards for system faults using conventional inspection techniques and even though they are necessary as a primary means for reduction of co₂ owing to the Climate Convention, electrical safety assessment and measures are required for the prevention of faults in residential facilities. Although small-scaled distributed power supplies can be utilized as important means of peak control and energy management measures, research is required for observing the effects on the system and the development of inspection technology to ensure stable operation, and the electrical safety of residential fuel cell systems need to be assessed and the problems derived for establishing electrical safety standards. From the year 2002, Japan has established laws on technical safety standards and development and rules on the product specifications and standards for the industrialization of hydrogen fuel cells. Also, a lot of effort have been made for the commercialization of fuel cells by building one-stop certification services. Internationally, the IEC TC 105 has established international standards based on fuel cells. In order to protect the national interest, the country should be able to respond accordingly meet global standards. In fact, in Korea, to comply with the international trend, Korea Energy Management Corporation is establishing a certified agenda for fuel cells and Korean Agency for Technology and Standards is enacting technical standards for fuel cells. The current terms of fuel cells are that research has been focused more on the quality and performance of manufactured products rather than stable power operation and maintenance over time. In this paper, by considering the household fuel cell as a power device, the safety standards of the fuel cell system for a reliable operation with the existing power system is being proposed.
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.
유보식 ( Bosik Ryu ),유길종 ( Giljong Yoo ),정진수 ( Jinsu Jung ),이은석 ( Eunseok Lee ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2
근래에 들어와 시스템의 복잡성에 대한 문제가 제기되고 있다. 그 해결책으로 대두되고 있는 자가치유 시스템이란 자율 컴퓨팅의 개념 중 하나로 사람의 개입 없이 시스템의 이상상태을 인식하고 정상 상태로 복귀 가능한 시스템을 의미한다. 이를 달성하기 위해서는 가장 먼저 필요한 것은 시스템의 어떤 부분에서 어떤 이상이 일어났는지 파악하는 것이다. 그래서 내외부적으로 여러 가지 접근을 통한 시스템에서의 이상여부를 파악하기 위한 모니터링 기법들이 연구되고 있다. 그렇지만, 기존의 여러 모니터링 기법에서는 부분에 초점을 두어 전체적인 시스템의 감시를 위한 다른 방법이 필요하다. 본 논문에서는 이를 해결하기 위하여 현재 부곽되고 있는 AOP(Aspect Oriented Programming)기법을 적용하여 각 기능의 수행범위 / 제약사항을 조절하며 기능적인 작은 이상을 파악한다. 또한, 모듈-기능 관계리스트를 사용하여 이상이 발생하였을 경우 어떤 요구사항이 위반되었는지 파악하고, 해당 기능들에 근거한 State-diagram을 사용함으로 시스템의 전체 흐름 상의 이상 발생을 감시하는 구조를 제안한다. 그리고 Case Study를 통해 실제 이 방법을 적용한 시스템의 감시가 가능하다는 것을 증명했다.