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액상 TiO₂를 이용한 Rhodamine B 광촉매 분해
나영수,김도한,이송우,송승구 부산대학교 환경문제연구소 1998 環境硏究報 Vol.16 No.-
Rhodamine B 광분해 반응성을 연구하기 위하여 UV, TiO_2 그리고 TiO_2와 UV를 동시에 사용하여 염료 분해 실험을 행하였다. 그리고 pH, 초기 Rhodamine B 농도와 TiO_2 투여 농도에 대한 염료 분해에 관하여 실험하였다. 이때 TiO_2와 UV를 동시에 사용한 경우가 가장 높은 분해속도를 나타내었으며, TiO_2 투여량 증가와 pH가 높을 수록 분해효율이 증가하였으며, 초기 염료 농도가 높을 수록 감소하였다. 그리고 분해 속도는 pseudo-1st order로 나타났다. The photocatalytic activation of Rhodamine B in aqueous titanium dioxide suspensions has been studied and compared with different methods: UV Light, TiO_2, and TiO_2 with UV illumination. The influence of pH, initial Rhodamine B concentration and TiO_2 concentration on reaction rate has been investigated in detail. The photocatalytic degradation with TiO_2 and UV illumination showed higher activity than only UV or TiO_2. Reaction rate Increased with TiO_2 concentration and pH but decreased with initial Rhodamine B concentration. The decomposition showed pseudo-1st order reaction.
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Thermal Hydraulic Issues of Containment Filtered Venting System for a Long Operating Time
나영수,하광순,박래준,박종화,조송원 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.6
This study investigated the thermal hydraulic issues in the Containment Filtered Venting System (CFVS) for a longoperating time using the MELCOR computer code. The modeling of the CFVS, including the models for pool scrubbingand the filter, was added to the input file for the OPR-1000, and a Station Blackout (SBO) was chosen as an accidentscenario. Although depressurization in the containment building as a primary objective of the CFVS was successful, thedecontamination feature by scrubbing and filtering in the CFVS for a long operating time could fail by the continuousevaporation of the scrubbing solution. After the operation of the CFVS, the atmosphere temperature in the CFVS becameslightly above the water saturation temperature owing to the release of an amount of steam with high temperature fromthe containment building to the scrubbing solution. Reduced pipe diameters at the inlet and outlet of the CFVS vesselmitigated the evaporation of scrubbing water by controlling the amount of high-temperature steam and the water saturationtemperature.
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나영수,Seong-Ho Hong,송진호,홍성완 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.6
A visualization test of the fuelecoolant interaction in the Test for Real cOrium Interactionwith water (TROI) test facility was carried out. To experimentally simulate the In-Vesselcorium Retention (IVR)- External Reactor Vessel Cooling (ERVC) conditions, prototypiccorium was released directly into the coolant water without a free fall in a gas phase beforemaking contact with the coolant. Corium (34.39 kg) consisting of uranium oxide and zirconiumoxide with a weight ratio of 8:2 was superheated, and 22.54 kg of the 34.39 kgcorium was passed through water contained in a transparent interaction vessel. An imageof the corium jet behavior in the coolant was taken by a high-speed camera every millisecond. Thermocouple junctions installed in the vertical direction of the coolant were cutsequentially by the falling corium jet. It was clearly observed that the visualization imageof the corium jet taken during the fuelecoolant interaction corresponded with the temperaturevariations in the direction of the falling melt. The corium penetrated through thecoolant, and the jet leading edge velocity was 2.0 m/s. Debris smaller than 1mmwas 15% ofthe total weight of the debris collected after a fuelecoolant interaction test, and the massmedian diameter was 2.9 mm.
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나영수,김진섭,강용철,변상기,나극환 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.8
본 논문에서는 고속 데이터 무선인식에 적용 될 2.45㎓ 수동형 RF-ID 시스템을 개발하였다. RF-ID 시스템은 수동형 태그 와 리더로 구성되어 있다. RF-ID 수동형 태그는 제로 바이어스 쇼트키 다이오드를 사용한 정류기, ID 칩, ASK 변조회로 그리고 backscatter 슬롯 안테나로 구성되어있다. 또한, ASK 변조를 위한 스위칭 소자로서 바이폴라 트랜지스터를 이용하여 저전력 소모 변조회로를 구성하였으며 태그의 슬롯 안테나는 일반 패치 안테나보다 광대역 특성을 갖는다. RF-ID 리더는 circulator를 사용하여 단일 마이크로스트립 패치 어레이 안테나를 사용하였으며 종래의 방식에서 채택하는 double-balanced mixer구조를 사용하지 않고 single-balanced mixer구조를 채택함으로서 회로의 복잡성을 개선하고 전체적인 단말기 크기를 소형화 가능하도록 설계하였다. 측정결과 동작주파수는 2.4 GHz이고 출력은 27 dBm (500 mW)에서 감지거리 1 m로 나타났다. 리더에서 측정된 변조신호는 -46.76 dBm이며 주파수는 57.2 kHz이다. In this paper, the RF-ID system for ubiquitous tagging applications has been designed, fabricated and analysed. The RF-ID System consists of passive RF-ID Tag and Reader. The passive RF-ID tag consists of rectifier using zero-bias schottky diode which converts RF power into DC power, ID chip, ASK modulator using bipolar transistor and slot loop antenna. We suggest an ASK undulation method using a bipolar transistor to compensate the disadvantage of the conventional PIN diode, which needs large current Also, the slot loop antenna with wider bandwidth than that of the conventional patch antenna is suggested The RF-ID reader consist of patch array antenna, Tx/Rx part and ASK demodulator. We have designed the RF-ID System using EM and circuit simulation tools. According to the measured results, The power level of modulation signal at 1 m from passive RF-ID Tag is -46.76 dBm and frequency of it is 57.2 KHz. The transmitting power of RF-ID reader was 500 mW
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나영수,변상기,나극환,김진섭,강용철 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.8
In this paper, the RF-ID system for ubiquitous tagging applications has been designed, fabricated and analysed. The RF-ID System consists of passive RF-ID Tag and Reader. The passive RF-ID tag consists of rectifier using zero-bias Schottky diode which converts RF power into DC power, ID chip, ASK modulator using bipolar transistor and slot loop antenna. We suggest an ASK modulation method using a bipolar transistor to compensate the disadvantage of the conventional PIN diode, which needs large current. Also, the slot loop antenna with wider bandwidth than that of the conventional patch antenna is suggested. The RF-ID reader consist of patch array antenna, Tx/Rx part and ASK demodulator. We have designed the RF-ID System using EM and circuit simulation tools. According to the measured results, The power level of modulation signal at 1 m from passive RF-ID Tag is -46.76 dBm and frequency of it is 57.2 ㎑. The transmitting power of RF-ID reader was 500 ㎽ 본 논문에서는 고속 데이터 무선인식에 적용 될 2.45 ㎓ 수동형 RF-ID 시스템을 개발하였다. RF-ID 시스템은 수동형 태그와 리더로 구성되어 있다. RF-ID 수동형 태그는 제로 바이어스 쇼트키 다이오드를 사용한 정류기, ID 칩, ASK 변조회로 그리고 backscatter 슬롯 안테나로 구성되어있다. 또한, ASK 변조를 위한 스위칭 소자로서 바이폴라 트랜지스터를 이용하여 저전력 소모 변조회로를 구성하였으며 태그의 슬롯 안테나는 일반 패치 안테나보다 광대역 특성을 갖는다. RF-ID 리더는 circulator를 사용하여 단일 마이크로스트립 패치 어레이 안테나를 사용하였으며 종래의 방식에서 채택하는 double-balanced mixer구조를 사용하지 않고 single-balanced mixer구조를 채택함으로서 회로의 복잡성을 개선하고 전체적인 단말기 크기를 소형화 가능하도록 설계하였다. 측정결과 동작주파수는 2.4 ㎓이고 출력은 27 dBm (500 ㎽)에서 감지거리 1 m로 나타났다. 리더에서 측정된 변조신호는 -46.76 ㏈m이며 주파수는 57.2 ㎑이다.
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