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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.
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.
Hyobong Ryu(유효봉),Byong-Guk Jeon(전병국),Hwang Bae(배황),Sung-Uk Ryu(류성욱),Sun-Joon Byun(변선준),Sung-Jae Yi(이성재),Hyun-Sik Park(박현식) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
An integral type reactor, SMART (System-integrated Modular Advanced ReacTor) has been recently equipped with an additional passive safety system, which maintains the reactor in a safe condition during the design basis accident without any AC power to drive the safety injection pumps and operator action. For verification of the SMART passive safety system, a single train of a passive safety system consisting of a core makeup tank (CMT), a safety injection tank (SIT), and two stages of an automatic depressurization system (ADS) were additionally attached to the existing SMART-ITL (Integral Test Loop for SMART) facility. In this paper, we describe the test procedure and test result of a SBLOCA simulation to evaluate the performance of the CMT, which has a flow distributor in the upper part. The test was carried out according to the sequence of events (SOE) for an SBLOCA scenario. Most of the thermal-hydraulic properties of the CMT, such as the pressure, temperature, injection flow rate, and water level were obtained during the test with the operation of the passive safety system. We conducted experiments using two types of CMT, which have the same volume but different aspect ratio, called CMT #1-1 and CMT #1-2 for a better understanding of the shape effect. Characteristic properties such as the pressure, thermal stratification, and injection behavior were studied and compared.
피동충수용 혼합형 안전주입탱크의 압력평형에 관한 이론적 해석 및 시험적 연구
류성욱(Sung Uk Ryu),유효봉(Hyobong Ryu),변선준(Sun-Joon Byun),전우진(Woo-Jin Jeon),박현식(Hyun-Sik Park),이성재(Sung-Jae Lee) 한국에너지학회 2015 한국에너지공학회 학술발표회 Vol.2015 No.11
피동충수용 혼합형 안전주입탱크는 한국원자력연구원에서 제안한 원자력 피동안전계통의 한 종류로, 안전주입탱크의 상부와 가압기를 연결하여 모든 운전압력 조건에서 냉각수 주입이 가능하도록 개선한 시스템이다. 본 연구에서는 피동충수용 혼합형 안전주입탱크, 가압기와 원자력압력용기에 대한 압력 네트워크를 통해 피동충수용 혼합형 안전주입탱크와 가압기의 압력이 평형이 되는 조건을 이론적으로 도출하였으며, 개별효과시험장치를 이용하여 안전주입탱크에서 발생하는 다양한 열수력 현상(증기응축 및 열혼합 현상)들을 파악하였다. The Hybrid Safety Injection Tank is a passive safety injection system that enables the safety injection water to be injected into the reactor pressure vessel throughout all operating pressures by connecting the top of the SIT and the pressurizer(PZR). In this study, the condition for balancing the pressure between the Hybrid SIT and PZR was derived theoretically. The pressure balancing condition was set at the point where the velocity of the Hybrid SIT coolant injected into the Direct Vessel Injection(DVI) line was at or above zero. If the condition was derived from a pressure network for the Hybrid SIT, pressurizer, and reactor pressure vessel, the pressure difference between the pressurizer and SIT is less than 0.07 MPa.