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허철민,황종희,임태영,김진호,이미재,유종성,박태호,문주호,Huh, Cheolmin,Hwang, Jonghee,Lim, Tae-Young,Kim, Jin-Ho,Lee, MiJai,Yoo, Jong-Sung,Park, Tae-Ho,Moon, Jooho 한국재료학회 2012 한국재료학회지 Vol.22 No.12
Yellow phosphor dispersed color conversion glasses are promising phosphor materials for white LED applications because of their good thermal durability, chemical stability, and anti-ultraviolet property. Six color conversion glasses were prepared with high Tg and low Tg specimens of glass. Luminous efficacy, luminance, CIE (Commission Internationale de l'Eclairage) chromaticity, CCT (Correlated Color Temperature), and CRI (Color Rendering Index) of the color conversion glasses were analyzed according to the PL spectrum. Color conversion glasses with high Tg glass frit, sintered at higher temperature, showed better luminous properties than did color conversion glasses with low Tg glass frit. The characteristics of the color conversion glass depended on the glass composition rather than on the sintering temperature. The XRD peaks of the YAG phosphor disappeared in the color conversion glass with major components of $B_2O_3$-ZnO-$SiO_2$-CaO and, in the XRD results, new crystalline peaks of $BaSi_2O_5$ appeared in the color conversion glass with major components of $Bi_2O_3$-ZnO-$B_2O_3$-MgO. The characteristics of CIE chromaticity, CCT, and the CRI of low Tg color conversion glasses showed worse color properties than those of high Tg color conversion glasses. However, these color characteristics of low Tg glasses were improved by thickness variation. So color conversion glasses with good characteristics of both luminous and color properties were attained.
치수최적설계를 이용한 핵연료집합체 연료봉 장입공정 모사
이재준(Jae-Jun Lee),이제원(Je-Won Lee),손세익(Se-Ick Son),이성기(Seong-Ki Lee),유종성(Jong-Sung Yoo) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
A nuclear fuel assembly (FA), which is manufactured through mechanical processes, consists of a skeleton and fuel rods, and the rods are inserted at each grid cell in the skeleton. The manufactured FA is deformed due to tolerances, rod insertion process and others. In this research, the deformation are analyzed for the insertion process. Fuel rod is stretched and forces are loaded at FA due to generated high loads during the insertion process. The high load occurs due to interference fit between spring/dimple in grid and rod. Because cell size, defined a distance between spring and dimple, is smaller than outer diameter of rod. To simulate the deformed FA, finite element (FE) analysis is performed using mechanical analysis for the generated loads and optimized FE model with characteristics of real FA. And, FA deformations of the FE analysis compare with those of actual manufactured FAs to verify the generated loads and optimized FE model.
수소흡수가 냉각재 상실사고 조건에서 지르코늄 핵연료피복관 파열거동에 미치는 영향
임도완 ( Do Wan Lim ),박동준 ( Dong Jun Park ),박정용 ( Jeong Yong Park ),장호 ( Ho Jang ),유종성 ( Jong Sung Yoo ),목용균 ( Yong Kyoon Mok ),서정민 ( Jung Min Suh ),이강문 ( Kang Moon Lee ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.7
To investigate the effects of hydrogen on the rupture behavior and mechanical property of ballooned-zirconium cladding after a loss-of-coolant accident, simulated loss-of-coolant-accident tests were carried out using pressurized-zirconium-tube samples with and without hydrogen pre-charging. A prehydrided cladding sample showed lower deformation in the ballooned area and lower rupture temperature than the as-received cladding sample. Ballooned cladding without hydrogen charging showed no significant difference in mechanical property, in spite of a wide range of values for circumferential strain and of a different balloon shape caused by a different heating rate. Pre-hydrided cladding, however, showed an increase in maximum load with increasing heating-rate. The strong relationship between hydrogen content and burst behavior during the loss-of-coolant accident was analyzed and the mechanism by which hydrogen hardens zirconium alloy was explained. †(Received August 2, 2013)