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초음파-알루미늄 기반의 수소 연료전지 자동차용 수소 누출 검지 센서
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),기성종(Seong-Jong Ki),김현일(Hyun-Il Kim),전인수(In-Su Jeon),기창두(Chang-Doo Kee) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5
We recently developed the ultrasonic-aluminum hydrogen detecting sensor to detect an explosion by hydrogen leakage of a hydrogen fuel cell vehicle. This sensor consists of a piezoelectric transducer which generates ultrasonic wave and aluminum plate coated with palladium and platinum. Ultrasonic wave generated from a piezoelectric transducer is guided and propagated through aluminum plate coated with palladium and platinum. In situation of hydrogen leakage, volume of the palladium layer is expanded because hydrogen molecules were adsorbed in palladium and inflated slightly. Futhermore pressure increase to aluminum plate by expansion of volume causes a loss of ultrasonic wave. In the result of this response, output voltage has decreased and the amplitude has gradually damped by increasing concentration of hydrogen gas. According to this study, developed ultrasonic-aluminum hydrogen detecting sensor is suitable to detect an explosion by hydrogen leakage of a hydrogen fuel cell vehicle.
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),기성종(Seong-Jong Ki),김현일(Hyun-Il Kim),전인수(In-Su Jeon),기창두(Chang-Doo Kee) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.9
We recently developed a Hydrogen Detecting Sensor based on ultrasonic wave using optical-fiber to detect the hydrogen leakage. This sensor consists of simple structure by piezoelectric and optical-fiber. A piezoelectric generates and receives ultrasonic wave because this sensor is fabricated by pulse-echo system. And an optical-fiber coated with palladium and platinum. Ultrasonic wave is transmitted through optical-fiber. In hydrogen environment, the volume of palladium is expanded now that hydrogen molecules were adsorbed and inflated in palladium. and the expanded volume of palladium changes the propagation behavior of the ultrasonic wave. So, we can find the changed output signal in comparison with input signal. Moreover the amplitude of output signal gradually decreased according to increasement of hydrogen concentration. As a result of this study, it is confirmed a Hydrogen Detecting Sensor based on Ultrasonic-Optical Fiber is suitable as a sensor of detecting hydrogen gas.
700℃ 고온 배관에 Type 316L 스테인리스강의 적용성 분석
이형연(Hyeong-Yeon Lee),남기언(Ki-Eun Nam),윤정(Jung Yoon),김현일(Hyeong-Il Kim),어재혁(Jahyuk Eoh) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Elevated temperature design and evaluations on Type 316L stainless steel piping in a 700℃ large-capacity thermal energy storage verification test loop (TESET) under commissioning at KAERI have been conducted. The hot leg piping with sodium coolant of 700℃ connect the main components of loop heater, hot tank and air-to-sodium heat exchanger. The design rules of ASME B31.1 and RCC-MRx provide design procedures for high-temperature piping in the creep range for Type 316L stainless steel. However, many material properties needed for design evaluations are not available over the temperature of 550℃ to 700℃. A series of high-temperature material strength tests were conducted in this study, and other essential material properties from previous test works on low cycle fatigue tests and creep tests were used for the design evaluations. The lack of material properties and design coefficients was determined based on the material tests associated with high-temperature design on the 700℃ piping. It was shown that Type 316L stainless steel can be used for a limited time duration in a high-temperature piping system of the TESET test facility subjected to 700℃ coolant.
$19^F NMR$ Investigation of $F_1$-ATPase of Escherichia coli Using Fluoroaluminate Complex
윤준호,손준형,이현우,여병일,최종환,정성호,김현원,Yun, Jun Ho,Son, Jun Hyeong,Lee, Hyeon U,Yeo, Byeong Il,Choe, Jong Hwan,Jeong, Seong Ho,Kim, Hyeon Won Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.1