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Graphite/Epoxy 적층복합판의 저속충격에 의한 손상거동
옹장우,김재훈,전제춘 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2
Damage behavior of quasi-isotropic circular composite plates of Herculus AS4/3501-6 graphite/epoxy were investigated and the residual compressive strength after impact under low-velocity impact type loads was evaluated. The locations and lengths of damages inside the plate after the impact were calculated by means of a three-dimensional finite element method and compared with the impact test results. Also, the load-deflection curves for impact were used to predict the major damage characteristics of the impact force in the laminated composites.
전제춘,이종수,임영목,정희돈 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.11
The crack closure phenomenon is important in the aspect of effecitve driving force for crack growth. Therefore, the precise measurement of crack closure load is an essential prerequisite for the determination of the effective driving force. In this study, the acoustic emission(AE) technique was employed as one of crack closure measurement methods and the results were compared with those of crack opening displacement method(CD), back face strain gage method(BFS) and surface strain gage method. Results have shown that the intrinsic fatigue Life curve(da/dN vs. ΔK_(eff)) obtained by use of the AE technique vvas best fit with the curve of high stress ratio (R=0.8) test, which implied that the AE technique could be considered as a reliable crack closure measurement method.
Kim, Chul-Min,Je, Byoung-Il,Koo, Ja-Choon,Piao, Hai-Long,Park, Soon-Ju,Jeon, Joo-Mi,Kim, Min-Kyoung,Park, Sung-Han,Park, Jin-Young,Lee, Eun-Jin,Chung, Woo-Sik,Lee, Kon-Ho,Kang, Kyu-Young,Lee, Sung-Ho Plant molecular biology and biotechnology research 2004 Plant molecular biology and biotechnology research Vol.2004 No.-
A maize transposable family, Ac/Ds, has been successfully utilized as a mutagenizing agent not only in monocot but also in dicot. In order to develop insertional mutagenesis system in pepper, the mobility of Ac/Ds has been examined. In this study, the excision of the elements was monitored via transient assay system with protoplasts. Two different systems were developed and compared; one- and two-elements systems. in a one-element system, Ac alone was introduced into cells. As a two-element system, Ac and Ds were cloned into a single vector and were expressed in protoplasts. Our data showed that both Ac and Ds elements were highly mobile in pepper cells. This is the first report suggesting that Ac/Ds mediated gene tagging system could be successfully operated in pepper.
Kim, Chul Min,Je, Byoung Il,Koo, Ja Choon,Piao, Hai Long,Park, Soon Ju,Jeon, Joo Mi,Kim, Min Kyoung,Park, Sung Han,Park, Jin Young,Lee, Eun Jin,Chung, Wook Sik,Lee, Kon Ho,Kang, Kyu Young,Lee, Sung-Ho 한국식물학회 2004 Journal of Plant Biology Vol.47 No.1
A maize transposable family, Ac/Ds, has been successfully utilized as a mutagenizing agent not only in monocot but also in dicot. In order to develop insertional mutagenesis system in pepper, the mobility of Ac/Ds has been examined. In this study, the excision of the elements was monitored via transient assay system with protoplasts. Two different systems were developed and compared; one- and two-elements systems. In a one-element system, Ac alone was introduced into cells. As a two-element system, Ac and Ds were cloned into a single vector and were expressed in protoplasts. Our data showed that both Ac and Ds elements were highly mobile in pepper cells. This is the first report suggesting that Ac/Ds mediated gene tagging system could be successfully operated in pepper.
Park, Ji-Won,Lee, In-Chul,Shin, Na-Rae,Jeon, Chan-Mi,Kwon, Ok-Kyoung,Ko, Je-Won,Kim, Jong-Choon,Oh, Sei-Ryang,Shin, In-Sik,Ahn, Kyung-Seop Informa UK (Informa Healthcare) 2016 Nanotoxicology Vol.10 No.4
<P>Copper oxide nanoparticles (CuONPs), metal oxide nanoparticles were used in multiple applications including wood preservation, antimicrobial textiles, catalysts for carbon monoxide oxidation and heat transfer fluid in machines. We investigated the effects of CuONPs on the respiratory system in Balb/c mice. In addition, to investigate the effects of CuONPs on asthma development, we used a murine model of ovalbumin (OVA)-induced asthma. CuONPs markedly increased airway hyper-responsiveness (AHR), inflammatory cell counts, proinflammatory cytokines and reactive oxygen species (ROS). CuONPs induced airway inflammation and mucus secretion with increases in phosphorylation of the MAPKs (Erk, JNK and p38). In the OVA-induced asthma model, CuONPs aggravated the increased AHR, inflammatory cell count, proinflammatory cytokines, ROS and immunoglobulin E induced by OVA exposure. In addition, CuONPs markedly increased inflammatory cell infiltration into the lung and mucus secretions, and MAPK phosphorylation was elevated compared to OVA-induced asthmatic mice. Taken together, CuONPs exhibited toxicity on the respiratory system, which was associated with the MAPK phosphorylation. In addition, CuONPs exposure aggravated the development of asthma. We conclude that CuONPs exposure has a potential toxicity in humans with respiratory disease.</P>