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( Jeong Il Bang ),( Jeong Jung Oak ),( Young Cheol Lee ),( Kwang Hyo Jung ),( Yong Ho Park ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.6
The aim of this study was to reinforce Al-Si/SiCp metal matrix composites (MMCs), which have homogeneous microstructures, by adding the Ti fibers and the Al-Mg powder. The Al-Si/SiCp MMC powder was fabricated by gas atomization for homogeneous distribution of the SiC particles. The Ti fibers were mixed with the Al-Si/SiCp MMC powder to structurally reinforce and enhance the interfacial bonding force between the Al-Si matrix and the Ti fibers. The Al-Mg powder was added as a binder to promote liquid phase sintering and to remove the oxide layer on the Al-Si/SiCp MMC powder. The Al-Si/SiCp system had homogeneous microstructures without any clustering of the SiC particles. The Ti fibers formed a diffusion layer at the interface of the Al-Si matrix and the Ti fibers. By adding the Ti fibers, the ultimate tensile strength and elongation increased from 194 to 234 MPa and from 6.2% to 7.6%, respectively. The Al-Mg powder liquefied during sintering and filled the pores between each particle, but the toughness of the Al-MMC decreased. (Received November 2, 2015)
이정한 ( Jung Han Lee ),김승룡 ( Seung Ryong Kim ),문영진 ( Young Jin Moon ),황정혜 ( Jung Hye Hwang ),성영모 ( Young Mo Sung ),강정옥 ( Jung Oak Kang ),호정규 ( Jeong Kyu Hoh ) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.7
In Korea, malaria is known to have been eradicated for several years due to our persistent national health programs. But recently imported malarias through increased traveling to abroad are becoming a problem and occasional malarial infections are being reported. No malarial infection of pregnant woman has been reported until now, but recently, we have experienced one case of malaria infected pregnant woman who has no history of traveling and blood transfusion. This patient has been treated with hydroxychlorquine. We present this case with a brief review of literatures.
( Jeong Uk Yang ),( Chulho Oak ),( Mann Hong Jung ),( Tae Won Jang ),( Chiharu Yoshii ) 대한결핵 및 호흡기학회 2013 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.116 No.-
Medical students will be in critical position to change smokers` behavior and to educate non-smokers` knowledge about second hand smoke in the future. Many stresses from educational courses can place students at a high risk of dependence not only to smoking, but also to alcohol, gambling, or internet. The purpose of this study is to investigate addictions (alcohol, internet, gambling) and social nicotine dependence among medical students using a structured questionnaire (Kano Test for Social Nicotine Dependence; KTSND), and to examine the relationships between KTSND and demographic variables (gender, school year, religion, smoking status) and investigated variables (alcohol, internet, gambling). A cross-sectional survey was conducted on 271 medical students in a Korean medical school using a self-administered questionnaire. A significant difference was observed in KTSND scores according to gender, smoking status, and religion. The total KTSND scores were significantly different according to the degrees of alcohol addiction defined as normal, problem drinking, alcohol use disorder, and alcohol dependence (12.22±5.11, 15.24±3.68, 15.44±3.68, and 15.90±4.48, respectively, p≤0.001). The regression analysis with alcohol addiction as a dependent variable showed a significant influence by smoking status (ß=.237, t=4.154, p<.001) and social nicotine dependence (ß=.192, t=3.350, p<.01). This study demonstrated a significant correlation between the KTSND and alcohol addiction, which supports potential importance of the KTSND for concurrent treatments.Medical students will be in critical position to change smokers` behavior and to educate non-smokers` knowledge about second hand smoke in the future. Many stresses from educational courses can place students at a high risk of dependence not only to smoking, but also to alcohol, gambling, or internet. The purpose of this study is to investigate addictions (alcohol, internet, gambling) and social nicotine dependence among medical students using a structured questionnaire (Kano Test for Social Nicotine Dependence; KTSND), and to examine the relationships between KTSND and demographic variables (gender, school year, religion, smoking status) and investigated variables (alcohol, internet, gambling). A cross-sectional survey was conducted on 271 medical students in a Korean medical school using a self-administered questionnaire. A significant difference was observed in KTSND scores according to gender, smoking status, and religion. The total KTSND scores were significantly different according to the degrees of alcohol addiction defined as normal, problem drinking, alcohol use disorder, and alcohol dependence (12.22±5.11, 15.24±3.68, 15.44±3.68, and 15.90±4.48, respectively, p≤0.001). The regression analysis with alcohol addiction as a dependent variable showed a significant influence by smoking status (ß=.237, t=4.154, p<.001) and social nicotine dependence (ß=.192, t=3.350, p<.01). This study demonstrated a significant correlation between the KTSND and alcohol addiction, which supports potential importance of the KTSND for concurrent treatments.
Shin, Jeong‐,Ah,Hong, Oak‐,Kee,Lee, Hye‐,Jung,Jeon, Sung‐,Yoon,Kim, Ji‐,Won,Lee, Seung‐,Hwan,Cho, Jae‐,Hyoung,Lee, Jung‐,Min,Choi, Yoon‐,Hee,Chang Wiley Subscription Services, Inc., A Wiley Company 2011 Journal of cellular biochemistry Vol.112 No.1
<P><B>Abstract</B></P><P>Pancreatic duct cells are considered a potential source of β‐cell regeneration, and transforming growth factor‐β (TGF‐β) has been suggested to perform an important role in these processes, but the underlying mechanism of the signal pathways, especially in humans, remains poorly understood. To evaluate the role of TGF‐β1, pancreatic duct cells were isolated from three brain‐dead organ donors. Pancreatic cell clusters harvested after islet isolation were dispersed to single cells and cultured in monolayers, then treated with TGF‐β1. We analyzed the characteristics of the cultured cells, the TGF‐β1 intracellular signaling pathway, the proliferation, and transdifferentiation rates of the duct cells. We also evaluated the genes and protein expression patterns after TGF‐β1 treatment. After TGF‐β1 treatment, typical morphologic changes representative of EMT were observed and Erk1/2, JNK, and AKT phosphorylation, Ras downstream effectors, were increased. β cell‐specific transcription factors including PDX‐1, Beta2/NeuroD, Ist‐1, and NGN3 were markedly suppressed and the rate of transdifferentiation into β cells was also suppressed. Genomic and proteomic analyses suggested that TGF‐β1 induces marked changes in a variety of structural genes and proteins associated with EMT. In conclusion, TGF‐β1 induces EMT in cultured human pancreatic duct cells, but suppresses its proliferation and transdifferentiation into β cells. Our results are the first report of TGF‐β1 effects for EMT and ductal cell transdifferentiation and proliferation at the protein level in human pancreatic duct cells. J. Cell. Biochem. 112: 179–188, 2011. © 2010 Wiley‐Liss, Inc.</P>