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RISS 인기검색어
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- 저자 : Yun-Suk Choi(최연석) (검색결과 2 건)
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Yun-Suk Choi(최연석),In Hwan Lee(이인환) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.5
Breath analysis using a portable device is better than the classical breath analysis system in terms of installation and operation. There is an increasing need to develop cost-effective equipment for testing gas sensors from the viewpoint of functionalities that can be applied applicable to portable devices. In the present study, an economical gas chamber for in-situ gas measurement is implemented with a single gas chamber without using expensive gas storage and control equipment; the gas response characteristics are analyzed using the above-described chamber. The main features of the implemented gas chamber are simple injection procedure, improved gas diffusion, easy measurement and cleaning, support for low-power mode measurement function for portable devices, and open source platform. Moreover, an analysis of gas response characteristics based on changes in sensor voltage show that the sensitivity and 90% response time are affected by the sensor voltage. Furthermore, the sensitivity graph has an inflection point in a specific range. The gas sensor applied in this study showed fast response speed and high sensitivity for sensor voltages of 3.0-3.5 V, regardless of the concentration of acetone gas, the target gas used in this study.
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김명수(Kim Myung Su),최연석(Choi Yeon Suk),김동락(Kim Dong Lak),이윤아(Lee Yun A) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Measurement of thermal contact resistance is one of the important components for the development of conduction-cooled superconducting magnet system because the metal is thermally connected to the refrigerator or heat sink to cool the superconducting magnet without cryogen. The thermal contact resistance occurs at the interface between metals and the amount of resistance can be affected by variable factors, such as surface roughness, contact area, and contact pressure. In the magnet system, there are several metal components in contact with each other for cooling superconducting magnet as well as supplying current to the magnet. Therefore, temperature gradient exists between superconducting magnet and refrigerator. In this study we designed the system for the characteristic measurement of thermal contact resistance of copper that mainly used for heat transfer at the conduction-cooled superconducting magnet system. We measured thermal resistance between copper surfaces for the temperature range between 35 to 80 K. The effect of contact pressure on the thermal contact resistance is also discussed.
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