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Investigation of p-type InAs nanowires grown via Au-assisted and self-assembled methods
Hwang, Jeongwoo,Shin, Jae Cheol Korean Physical Society 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.11
We have investigated the p-type doping profiling of InAs nanowries (NWs) grown via the Au-assisted vapor-liquid-sold (VLS) and the self-assembled growth methods. The VLS is the most commonly used mechanism for the growth of semiconductor NWs. The VLS-grown InAs NWs, however, show a large degree of variation in their electrical resistance along their growth direction. In addition, attempts to form heavily p-type doped InAs NWs lead to a strong kinking in the shapes of the NWs, disturbing their one-dimensional growth. In contrast, the p-type doped InAs NWs grown via the self-assembled method exhibit very low and uniform electrical resistance along the growth direction of the NWs. The doping mechanisms of the InAs NWs and their growth methods are further discussed.
IMA: Identifying disease-related genes using MeSH terms and association rules
Kim, Jeongwoo,Bang, Changbae,Hwang, Hyeonseo,Kim, Doyoung,Park, Chihyun,Park, Sanghyun Elsevier 2017 Journal of biomedical informatics Vol.76 No.-
<P><B>Abstract</B></P> <P>Genes play an important role in several diseases. Hence, in biology, identifying relationships between diseases and genes is important for the analysis of diseases, because mutated or dysregulated genes play an important role in pathogenesis. Here, we propose a method to identify disease-related genes using MeSH terms and association rules. We identified genes by analyzing the MeSH terms and extracted information on gene-gene interactions based on association rules. By integrating the extracted interactions, we constructed gene-gene networks and identified disease-related genes. We applied the proposed method to study five cancers, including prostate, lung, breast, stomach, and colorectal cancer, and demonstrated that the proposed method is more useful for identifying disease-related and candidate disease-related genes than previously published methods. In this study, we identified 20 genes for each disease. Among them, we presented 34 important candidate genes with evidence that supports the relationship of the candidate genes with diseases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We propose a method to identify disease-related genes using MeSH terms and association rules. </LI> <LI> We construct gene-gene interaction networks for each disease. </LI> <LI> We identify disease-related genes and meaningful disease-related candidate genes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
3D Printing of Ground Tire Rubber Composites
Faez Alkadi,Jeongwoo Lee,Jun-Seok Yeo,Seok-Ho Hwang,Jae-Won Choi 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.2
Recycled tire rubber is an environmentally and economically beneficial material. Ground tire rubber (GTR) as a filler in a polymer matrix was used as an ink material (composite material) for material extrusion in a 3D printing process. The maximum allowable amount of GTR incorporated into the mixture without significantly altering the rheological behavior of the ink was set. Printability investigations revealed that pressure and speed show linear and power relationships, respectively, to the line width for three different amounts of GTR. Moreover, the post-curing time of 30 min at 115 °C was set as the full-cure condition to achieve polymerization of 80% or more for the 3D printed parts. Unidirectional tensile testing demonstrated that 3D printed specimens exhibit no degradation in tensile strength when compared to molded specimens. Moreover, printability and mechanical properties of functionalized GTR were investigated to determine if this material exhibits enhanced mechanical strength. Unidirectional tensile tests show that the maximum tensile strength for specimens with functionalized GTR was 20% higher than in specimens with non-functionalized GTR. In conclusion, 3D printing of GTR composites shows promise for using recycled GTR to create 3D structures with rubber-like properties.