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부양형 탄소나노튜브 나노시트를 이용한 pH센서의 제작과 보정
유효봉 ( Hyo Bong Ryu ),최우석 ( Woo Seok Choi ),안태창 ( Tae Chang An ),허준성 ( Joon Seong Heo ),임근배 ( Geun Bae Lim ) 한국센서학회 2013 센서학회지 Vol.22 No.3
In this research, the pH sensor was developed using CNT nanosheet with Nafion coating for the advanced medical sensor such as a blood gas analyzer. The CNT nanosheet was formed by dielectrophoresis and water-meniscus between cantilever-type electrodes. Then, the process of the heat annealing and the Nafion coating was conducted for reducing contact resistance and giving proton selectivity respectively. We measured the response of the pH sensor as the electrolyte-gated CNT-nanosheet field effect transistor. The sensor showed a linear current ratio in a similar range of the normal blood pH. The calibration method was also introduced for decreasing the response variation of between sensors. Coefficient of variance of the pH sensor was decreased by applying the calibration method. A linear relation between the calibrated response of the sensors and pH variance was also obtained. Finally, the pH sensor with a high resolution was fabricated and we verify the feasibility of the sensor by applying the calibration method.
전기방사를 이용한 TiO2/PVP/LiCl 나노섬유 습도 센서의 제작과 평가
유효봉 ( Hyo Bong Ryu ),김범주 ( Bum Joo Kim ),권혁진 ( Hyuk Jin Kwon ),허준성 ( Joon Seong Heo ),임근배 ( Geun Bae Lim ) 한국센서학회 2014 센서학회지 Vol.23 No.1
Recently, tremendous application utilizing electrospun nanofibers have been actively reported due to its several advantages, such as high surface to volume ratio, simple fabrication and high-throughput manufacturing. In this paper, we developed highly sensitive and consistent nanofiber humidity sensor by electrospinning. The humidity sensor was fabricated by rapid electrospinning (~2 sec) TiO2/ PVP/LiCl mixed solution on the micro-interdigitated electrode. In order to evaluate the humidity sensing performances, we measured current response using DC bias voltage under various relative humidity levels. The results show fast response / recovery time and marginal hysteresis as well as long-term stability. In addition, with the aid of micro-interdigitated electrode, we can reduce a total resistance of the sensor and increase the total reaction area of nanofibers across the electrodes resulting in high sensitivity and enhanced current level. Therefore, we expect that the electrospun nanofiber array for humidity sensor can be feasible and promising for diverse humidity sensing application.
SMART-ITL 1 계열 피동안전계통을 이용한 안전주입배관 파단 소형냉각재상실사고 모의에 대한 실험적 연구
류성욱(Sung Uk Ryu),배황(Hwang Bae),유효봉(Hyo Bong Ryu),변선준(Sun Joon Byun),김우식(Woo Shik Kim),신용철(Yong-Cheol Shin),이성재(Sung-Jae Yi),박현식(Hyun-Sik Park) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.3
노심보충탱크(Core Makeup Tank, CMT), 안전주입탱크(SafetyInjection Tank, SIT)와 자동감압계통(Auto Depressurization System, ADS)로 구성된 1 계열의 SMART 피동안전주입계통의 주입특성을 파악하기 위한 소형냉각재상실사고(SBLOCA) 모의에 대한 실험적 연구가 수행되었다. SBLOCA 모의시험은 0.4 인치 안전주입수 배관파단에 대해 수행되었으며, 정상상태 조건은 실험요건서에 제시된 시험 초기 조건을 만족시키도록 746초 동안 운전되었다. 노심 출력 및 안전주입 유량 등의 경계 조건도 적절히 모의되었으며, 안전주입계통 배관에서의 파단, 히터 트립 및 잔열곡선 인가, 원자로냉각재펌프 관성서행(Coastdown), 급수 중단, CMT 및 SIT의 주입, ADS #1 개방이 SBLOCA 시나리오에 따라 적절히 모의되었다. 노심지지원통 내부의 액체환산수위는 파단 초반에 감소하다가 CMT와 SIT가 주입되면서 서서히 회복되었으며, 피동안전주입계통의 주입유량이 노심 수위를 회복하기에 충분한 것으로 판단할 수 있다. An experimental study of the thermal-hydraulic characteristics of passive safety systems (PSSs) was conducted using a system-integrated modular advanced reactor-integral test loop (SMART-ITL). The present passive safety injection system for the SMART-ITL consists of one train with the core makeup tank (CMT), the safety injection tank, and the automatic depressurization system. The objective of this study is to investigate the injection effect of the PSS on the small-break loss-of-coolant accident (SBLOCA) scenario for a 0.4 inch line break in the safety-injection system (SIS). The steady-state condition was maintained for 746 seconds before the break. When the major parameters of the target value and test results were compared, most of the thermal-hydraulic parameters agreed closely with each other. The water level of the reactor pressure vessel (RPV) was maintained higher than that of the fuel assembly plate during the transient, for the present CMT and safety injection tank (SIT) flow rate conditions. It can be seen that the capability of an emergency core cooling system is sufficient during the transient with SMART passive SISs.
열수력 종합효과 시험장치를 이용한 SMART(일체형 원자로)의 소형파단사고 모의에 대한 실험적 연구
류성욱(Sung Uk Ryu),배황(Hwang Bae),유효봉(Hyo Bong Ryu),김우식(Woo Shik Kim),신용철(Yong-Cheol Shin),이성재(Sung-Jae Yi),박현식(Hyun-Sik Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The experimental study on the thermal-hydraulic characteristics of passive safety injection systems (PSISs) was conducted using the SMART-ITL (System-Integrated Modular Advanced ReacTor-Integral Test Loop) facility which was constructed by KAERI. The objective of this study is to investigate the effects of the flow rate of PSISs on the small-break loss-of-coolant accident (SBLOCA) scenario of the safety injection system (SIS) line break. The steady-state condition was maintained for 600 seconds before the break. When the major parameters were compared between the target value and test result, most of the thermal-hydraulic parameters agree well with each other. The water level of reactor pressure vessel (RPV) was maintained higher than that of a fuel assembly plate during the transient for the present CMT (Core Makeup Tank) and SIT (Safety Injection Tank) flow rates condition. It can be seen that the capability of an emergency core cooling system is sufficient with the PSISs of SMART during the transient.
SMART-ITL 안전주입배관 파단시 노심보충수탱크 주입성능에 관한 실험적 연구
변선준(Sun-Joon Byun),배황(Hwang-Bae),류성욱(Sung-Uk Ryu),전병국(Byong-Guk Jeon),유효봉(Hyo-Bong Ryu),민경호(Kyoung-Ho Min),방윤곤(Yun-Kon Bang),전우진(Woo-Jin Jeon),이성재(Sung-Jae Yi),박현식(Hyun-Sik Park) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
System-integrated modular advanced reactor (SMART) is an integral-type nuclear reactor which received its design certificate in 2012 for the first time in the world. Currently, to improve its safety level, passive safety systems are designed and their performance has been evaluated. In this study, to examine the injection characteristics of a core makeup tank, a small-break loss of coolant accident is simulated using the SMART integral test loop (SMART-ITL). The experimental results provide more understanding on the behaviors of core makeup tanks (CMTs) as well as supporting future licensing process.