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오늘 본 자료
Han, Jung-Hoon,Oh, Juhyun,Yoon, Sangmoon,Kim, Yanghoo,Han, Heung Nam,Kim, Miyoung Korean Society of Microscopy 2016 Applied microscopy Vol.46 No.4
Twinning-induced plasticity (TWIP) steels with the austenite structure containing high manganese exhibit both good strength and excellent formability. Such properties originate from crystallographic slip and mechanical twins produced when the austenite structure is under mechanical stress. There are 12 twin systems, referred to as twin variants, when slip is induced. These twin systems include twin planes and twin directions and play an important role in determining strength and ductility of the material by strongly influencing texture formation of the austenite structure. In the present study, twins produced in a high-Mn TWIP steel as a result of uniaxial tension were observed using a transmission electron microscope; a comparative analysis was performed through interaction energy calculations. Electron diffraction was used to determine the twin system with respect to the uniaxial tension direction in each grain. Both the Schmid factors and interacting energies required for the generation of twins were calculated and subsequently compared with experimental results. This approach demonstrated the possibility of predicting the deformation behavior of the material.
Han-Yong Kim,Myoung-Seok Lee,Byoung-Man Kang,Dong-Jun Chang,Woo-Jung Choi,Kyu-Nam An,Oh-Do Kwon,Heung-Gyu Park,Hae-Ryoung Shin 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
To know how interacting climate drivers may affect rice quality, we investigated physio-chemical properties of brown and milled rice. Rice crops (Oryza sativa L., cv. Ilmybyeo and Pyounganbyeo) were grown under either ambient [370ppmV (2008)/396ppmV (2009)] or elevated CO2 of 650ppmV (2008)/673ppmV (2009) in three levels of air temperature [(Ta), local ambient Ta [25.9℃ (2008)/24.8℃ (2009)], 1.3℃ and 2.4℃ above ambient Ta] over whole seasons, using six temperature gradient chambers established in paddy fields. Over 2 years, thus the experiments were a 2×3 factorial design with three replicate plots of each CO2×Ta combination. The fractions of normal brown rice were reduced with elevating CO2 by 8% (Ilmybyeo)~14% (Pyounganbyeo), and with rising Ta by 16% (+1.3 ℃)~27% (+2.4℃) in Ilmybyeo and by 27% (+1.3℃)~42% (+2.4℃) in Pyounganbyeo (p=0.015, 0.000, 0.059, 0.000 and 0.017 for CO2, Ta, CO2×Ta, cultivar and Ta×cultivar, respectively). With respect to immature rice, elevating CO2 increased milky-white rice, white-based rice and white-belly rice across cultivars. Warming also significantly increased all immature rice across cultivars, though no CO2×Ta interaction was observed. Over 2 years, the deteriorative effect of warming on brown rice quality was significantly greater in Pyounganbyeo than in Ilmybyeo. Across cultivars, protein contents of milled rice were decreased (c. 5~9%) with elevating CO2 but increased (c. 5%) with warming, though no CO2×Ta interaction was found (p=0.119). Elevating CO2 significantly increased whiteness of milled rice over cultivars but not amylose contents and gloss value of cooked rice, while warming had a strong affect these properties all related rice quality. Overall, our results suggest that warming and elevating CO2, in each alone or in combination, may have the potential to deteriorate physio-chemical properties of rice related to quality.
ACUTE INHALATION TOXICITY STUDY WITH TOLUENE IN RATS
Heung-Sik Seo,Young-Su Yang,Jinsoo Lee,Min-Sung Kang,Soonjin Kwon,Seong-Jin Choi,Soo-Nam Kim,Byeong-Chan Lee,Hyo-Seon Yang,Yong-Ah Han,Hee-Jin Yu,Jae-Hwan Kim,Jin-Hee Lee,Jeong-Ah Song,Kyung Jin Jung 한국환경독성학회 2009 한국독성학회 심포지움 및 학술발표회 Vol.2009 No.11