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하나로 원자로에 설치될 대향 이상 열사이펀 루프에 관한 실험
황권상,조만순,성형진,Hwang, Kwon-Sang,Cho, Man-Soon,Sung, Hyung-Jin 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.8
An experimental study was carried out to delineate the flow characteristics in a closed countescurrent two-phase thermo syphon with concentric tubes. This is to be installed in the HANARO research reactor as a part of a Cold Neutron Source(CNS). In the present investigation, experiments ata room temperature with Freon-II3 as a moderator were performed. Results show that, based on the magnitude of pressure fluctuation, the flow regimes could be divided into 4 distinct ones in the ($V_f,\;Q_i$) plane, where $V_f$ represents the volume of the charged liquid and $Q_i$ the heat load: a stable flow regime, an oscillatory flow regime, a restablized flow regime and a dryout flow regime. For $V_f$>2.5l, the flow is stable at low $Q_i$. However, as $Q_i$ increases, the flow becomes oscillatory and finally restablizes As $V_f$ increases, the oscillation amplitude decreases, reaching to the restablized flow region at low $Q_i$, and the liquid level in the moderator cell remains high. In the oscillatory flow regimes, for a fixed VI; the oscillating period of time varies with $Q_i$, having a minimum value at a certain value of $Q_i$. The heat load, where the oscillating period of time is minimum, decreases as $V_f$ increases.
중성자 조사에 따른 SiC Schottky Diode의 전기적 특성 변화
김성수,강민석,조만순,구상모,Kim, Sung-Su,Kang, Min-Seok,Cho, Man-Soon,Koo, Sang-Mo 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.4
The effect of neutron irradiation on the properties of SiC Schottky Diode has been investigated. SiC Schottky diodes were irradiated under neutron fluences and compared to the reference samples to study the radiation-induced changes in device properties. The condition of neutron irradiation was $3.1{\times}10^{10}$ $n/cm^2$. The current density after irradiation decreased from 12.7 to 0.75 $A/cm^2$. Also, a slight positive shift (${\Delta}V_{th}$= 0.15 V) in threshold voltage from 0.53 to 0.68 V and a positive change (${\Delta}{\Phi}_B$= 0.16 eV) of barrier height from 0.89 to 1.05 eV have been observed by the neutron irradiation, which is attributed to charge damage in the interface between the metal and the SiC layer.
중성자 조사한 4H-SiC MOSFET의 열처리에 의한 전기적 특성 변화
이태섭,안재인,김소망,박성준,조슬기,주기남,조만순,구상모,Lee, Taeseop,An, Jae-In,Kim, So-Mang,Park, Sung-Joon,Cho, Seulki,Choo, Kee-Nam,Cho, Man-Soon,Koo, Sang-Mo 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.4
In this work, we have investigated the effect of a 30-min thermal anneal at $550^{\circ}C$ on the electrical characteristics of neutron-irradiated 4H-SiC MOSFETs. Thermal annealing can recover the on/off characteristics of neutron-irradiated 4H-SiC MOSFETs. After thermal annealing, the interface-trap density decreased and the effective mobility increased in terms of the on-characteristics. This finding could be due to the improvement of the interfacial state from thermal annealing and the reduction in Coulomb scattering due to the reduction in interface traps. Additionally, in terms of the off-characteristics, the thermal annealing resulted in the recovery of the breakdown voltage and leakage current. After the thermal annealing, the number of positive trapped charges at the MOSFET interface was decreased.
Ag계/Ni계 용가재를 이용한 STS 304L과 Inconel 600의 브레이징에 관한 연구
심규택(Kyue-Taek Shim),주기남(Kee-Nam Choo),조만순(Man-Soon Cho),박승재(Sung-Jae Park),김재훈(Jae-Hoon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study was carried out to develop the joining technology by nicro-brazing of STS 304L tube and the thermocouple of Inconel 600 sheath, which is used as an instrument for high-temperature irradiation in HANARO. BAg-1 and BNi-7 were used as filler materials, and AMCO 446 was selected as flux in the brazing. For evaluation of solidity of the joining, the tensile strength and the micro hardness were measured. Both the brazings of STS 304L and Inconel using BAg-1 and BNi-7 filler materials were joined firmly. Some spot flaws were found at the joining places using BNi-7 filler material, however, they turned out not to affect the strength of the materials.