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Jeon, Eun Chae,Baik, Min Kyung,Kim, Sung Hoon,Lee, Baik Woo,Kwon, Dong Il Trans Tech Publications, Ltd. 2005 Key Engineering Materials Vol.297 No.-
<P>A new method [1] to evaluate indentation flow curves using an instrumented indentation test has been applied to many materials for several years. Though the method produces relatively good results compared to uniaxial tensile tests, a few parameters had not been verified by theoretical or numerical methods. In this study, proportional constants of representative strain and representative stress were verified using finite element analysis and proven to be unaffected by the elastic property and strain level. The constants were generally dependent on the plastic property; however, one combination of the constants is independent of all properties. The values of this combination are consistent with early research and produced overlapping indentation flow curves with uniaxial curves. </P>
Jeon, Sang-Chae,Lee, Jae-Won,Yoon, Joo-Young,Cho, Yung-Zun,Hur, Jin-Mok Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.17
<P><B>Abstract</B></P> <P>A simple way to use a commercial Al<SUB>2</SUB>O<SUB>3</SUB>-based refractory in a sintering furnace was developed for the head-end system in pyroprocessing. The key was to suppress the intrinsic chemical reactivity of the mullite phase in a refractory with gaseous Cs released from spent fuel in a sintering furnace. Owing to the excellent thermodynamic and thermal stability of Y<SUB>2</SUB>O<SUB>3</SUB>, it was deposited on commercial refractories as air-plasma-sprayed coatings. The coated samples maintained their physical integrity without severe delamination after repeated heat treatment at 1450°C for 12h in an atmosphere of Ar and 4% H<SUB>2</SUB>. The chemical reactivity of the coated samples was also confirmed to be satisfactory through a reaction experiment using Cs<SUB>2</SUB>CO<SUB>3</SUB> powder. In addition, the coated surfaces were resistant against accidental contamination owing to the formation of non-Cs-reactive yttrium silicate rather than Cs-reactive mullite.</P>
Fluorescence Modulation of Graphene Quantum Dots Near Structured Silver Nanofilms
Chae, Weon-Sik,Yun, Jungheum,Nam, Sang-Hyeon,Lee, Sang-Geul,Yang, Won-Geun,Yoon, Hyewon,Park, Minsu,Jeon, Seokwoo American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.16
<P>Here, we study the plasmonic metal-enhanced fluorescence properties of blue-emitting graphene quantum dots (GQDs) and green-emitting graphene oxide quantum dots (GOQDs) using fluorescence lifetime imaging microscopy. Reactive ion sputtered silver (Ag) on zinc oxide (ZnO) thin films deposited on silicon (Si) wafers are used as the substrates. The morphology of the sputtered Ag gradually changes from nanoislands, via and elongated network and a continuous film with nanoholes, to a continuous film with increasing sputtering time. The fluorescence properties of GQD and GOQD on the Ag are modulated in terms of the intensities and lifetimes as the morphology of the Ag layers changes. Although both GQD and GOQD show similar fluorescence modulation on the Ag nanofilms, the fluorescence of GQD is enhanced, whereas that of GOQD is quenched due to the charge transfer process from GOQD to ZnO. Moreover, the GQD and GOQD exhibit different fluorescence lifetimes due to the effect of their electronic configurations. The theoretical calculation explains that the fluorescence amplification on the Ag nanofilms can largely be attributed to the enhanced absorption mechanism arising from accumulated optical fields around nanogaps and nanovoids in the Ag nanofilms.</P> [FIG OMISSION]</BR>
Sung, Myung-Soon,Lee, Eun-Gyeong,Jeon, Hyun-Soon,Chae, Han-Jung,Park, Seoung Ju,Lee, Yong Chul,Yoo, Wan-Hee Kluwer Academic/Plenum Publishers 2012 INFLAMMATION Vol.35 No.4
<P>This study was aimed to determine the effects of quercetin on the interleukin-1β (IL-1β)-induced proliferation of rheumatoid synovial fibroblasts (RASFs) and production of matrix metalloproteinases (MMPs), cyclooxygenase (COX), and prostaglandin E2 (PGE2) by RASFs. The proliferation and apoptosis of RASFs was evaluated with CCK-8 reagent and flow cytometry in the presence of IL-1with CCK-8 reagquercetin. The expression of MMPs, IL-1β enhanced the expression of MMP-1, MMP-3, tissue inhibitor of metalloproteinase (TIMP)-1, COXs, PGE2, and intracellular mitogen-activated protein kinase (MAPK) signalings including phosphorylated extracellular signal-regulated kinase (p-ERK), p-p38, phosphorylated c-Jun N-terminal kinase (p-JNK), and nuclear factor kB (NF-kB) were examined by immunoblotting or semiquantitative reverse transcription-polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA) in conditions as described above. Quercetin inhibits unstimulated and IL-1β-induced proliferation of RASFs and MMP-1, 3, COX-2 messenger ribonucleic acid and protein expression, PGE2 production induced with IL-1β. Quercetin also inhibits the phosphorylation of ERK-1/2, p38, JNK and activation of NF-kB by IL-1ed. These results indicate that quercetin inhibits synovial fibroblasts proliferation and MMPs, COX-2, and PGE2 production, which involved joint destruction in rheumatoid arthritis (RA), and suggest that it might be a new therapeutic agent for management of RA.</P>
Scaling Up Fabrication of UO2 Porous Pellet With a Simulated Spent Fuel Composition
Sang-Chae Jeon,Jae-Won Lee,Joo-Young Yoon,Yung-Zun Cho 한국방사성폐기물학회 2017 방사성폐기물학회지 Vol.15 No.4
KAERI의 PRIDE 시설에서 공학규모의 전해환원용 원료물질인 UO2 다공성펠렛 제조를 위해 공정과 장치를 최적화시킨 내 용을 다루었다. UO2 분말과 별도로 attrition 밀링된 대용산화물 분말을 출발분말로, 정밀 칭량을 통해 사용후핵연료 조성을 모사하였다(Simfuel). Simfuel 분말은 각각 tumbling mixer로 혼합하여 균질화 하고, rotary press로 성형하여 furnace를 이 용해 소결하였다. 4% H2-Ar 분위기에서 1450℃ 24시간 고온 열처리하여 제조된 소결펠렛은 6.89 g·cm-3의 벌크밀도를 가 지며 이는 후속 전해환원 공정의 요구에 부합한다. 소결된 다공성펠렛의 미세구조 관찰을 통해 다공성 기지상과 함께 산화/ 금속 석출물이 관찰되어 사용후핵연료의 상이 모사됨을 확인하였다. 본 결과는 향후 공학규모 이상의 파이로 연구를 위한 UO2 다공성펠렛 제조에 중요한 기초자료로 활용 될 것이다. Processing and equipment were tailored for engineering scale fabrication of UO2 porous pellets, a feed material for the electrolytic reduction process in the PRIDE (PyRoprocessing Integrated DEmonstration) facility at KAERI (Korea Atomic Energy Research Institute). The starting materials, UO2 powder and pre-milled surrogate oxide powders, were proportioned to simulate the chemical composition of spent fuel (so-called Simfuel). The Simfuel powders were homogenized by mixing, compacted into a pellet shape, and finally heat treated using a tumbling mixer, rotary press, and sintering furnace. After sintering at 1450℃ for 24 h in 4% H2-Ar, the average bulk density of the UO2 Simfuel pellets was 6.89 g·cm-3, which meets the standard of the following electrolytic reduction process. In addition, the results of a microstructural analysis demonstrated that the sintered Simfuel UO2 porous pellets accurately simulate the properties of spent fuel in terms of the formation of second phases. These results provide essential information for the massive fabrication of UO2 porous pellets for engineering scale pyroprocessing research.
Chae, Yee Soo,Kim, Jong Gwang,Sohn, Sang Kyun,Cho, Yoon Young,Ahn, Byung Min,Moon, Joon Ho,Jeon, Seoung Woo,Park, Jae Yong,Lee, In Taek,Choi, Gyu Seog,Jun, Soo-Han The Korean Academy of Medical Sciences 2008 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.23 No.3
<P>Since vascular endothelial growth factor (VEGF) is known to be a potent pro-angiogenic factor, we evaluated the potential association of two <I>VEGF</I> gene polymorphisms (-634G>C and 936C>T) with the susceptibility and the clinicopathologic characteristics of colorectal cancer (CRC). The <I>VEGF</I> genotypes were determined using fresh colorectal tissue from 465 patients who had undergone a surgical resection and peripheral blood lymphocytes from 413 healthy controls by PCR/DHPLC assay. For the -634G>C polymorphism, the -634 GC or CC genotype was associated with a decreased risk of CRC (odds ratio [OR], 0.62; <I>p</I>=0.001) as a dominant model of C allele, whereas the 936 TT genotype correlated with advanced stage/ metastasis, a high serum level of CA19-9, and an higher grade in patients with CRC. In the haplotype analyses, haplotype -634C/936C and -634G/936T were associated with a decreased susceptibility of CRC (OR, 0.53 and 0.56; <I>p</I><0.001, respectively). These observations imply that the <I>VEGF</I> gene polymorphisms may be associated with the susceptibility or clinicopathologic features of CRC. However, further studies of other <I>VEGF</I> sequence variants and their biological functions are needed to understand the role of the <I>VEGF</I> gene polymorphisms in the development and progression of CRC.</P>