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( Chan Ik Park ),( Sang Bong Lee ),( Kwang Hee Yeo ),( Seungchan Lee ),( Sung Jin Park ),( Ho Hyun Kim ),( Jae Hun Kim ),( Chang Won Kim ),( Chan Yong Park ) 대한외상학회 2016 大韓外傷學會誌 Vol.29 No.2
Transcatheter arterial embolization (TAE) for blunt hepatic injury in children is not common and is especially rare after damage control surgery (DCS). We report a successful TAE after DCS on a child for massive bleeding from the left hepatic artery due to a motor vehicle accident. The car (a sport utility vehicle) ran over the chest and abdomen of a 4- year-old boy. On arrival, initial vital signs were as follows: blood pressure, 70/40 mmHg; heart rate, 149/min; temperature, 36.7。C; respiratory rate, 38/min. After resuscitation, computed tomography was done, and a suspicious contrast leakage from a branch of the left hepatic artery and a spleen injury (grade V) were found. TAE was performed successfully after DCS for a liver injury. [ J Trauma Inj 2016; 29: 47-50 ]
Semiclassical Boltzmann transport theory for multi-Weyl semimetals
Park, Sanghyun,Woo, Seungchan,Mele, E. J.,Min, Hongki American Physical Society 2017 Physical Review B Vol.95 No.16
<P>Multi-Weyl semimetals (m-WSMs) are a new type of Weyl semimetal that have linear dispersion along one symmetry direction but anisotropic nonlinear dispersion along the two transverse directions with a topological charge larger than one. Using the Boltzmann transport theory and fully incorporating the anisotropy of the system, we study the dc conductivity as a function of carrier density and temperature. We find that the characteristic density and temperature dependence of the transport coefficients at the level of Boltzmann theory are controlled by the topological charge of the multi-Weyl point and distinguish m-WSMs from their linear Weyl counterparts.</P>
Park, Jongbok,Lee, Junho,Jo, Ilguk,Cho, Seungchan,Lee, Sang Kwan,Lee, Sang Bok,Ryu, Ho Jin,Hong, Soon Hyung Elsevier 2016 Surface & Coatings Technology Vol. No.
<P><B>Abstract</B></P> <P>This study investigates the effects of a surface modification of a SiC tile on the wetting behavior and interfacial bond strength of SiC tile/Al7075-SiC<SUB>p</SUB> hybrid composites fabricated by a liquid-press process. SiO<SUB>2</SUB>, Ni, and Si layers were fabricated on each SiC tile, and the microstructures at the interface between the surface-modified SiC tile and the Al7075 were analyzed. In addition, the interfacial bond strength and wettability between the SiC tile and Al7075 were measured by the push-out method and the sessile drop method, respectively. The interfacial bond strength and wettability tests demonstrate that the surface modification of a SiC tile with Al7075 can effectively improve the tendency to attain wetting between the SiC tile and Al7075, due to the suppression of the formation of brittle Al<SUB>4</SUB>C<SUB>3</SUB> at the interface between the SiC tile and Al7075.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The surface of SiC tile (SiC<SUB>t</SUB>) was modified by oxidation, Ni plating, and Si coating. </LI> <LI> The tendency to attain wetting between the modified SiC<SUB>t</SUB> and Al7075 was improved. </LI> <LI> The interfacial bond strength between the modified SiC<SUB>t</SUB> and Al7075 increased. </LI> <LI> The surface modification suppressed the formation of Al<SUB>4</SUB>C<SUB>3</SUB> at the interface. </LI> </UL> </P>
용융가압함침공정을 이용한 세라믹 입자 강화 철강복합재료의 제조성 검증
조승찬 ( Seungchan Cho ),이영환 ( Yeong-hwan Lee ),고성민 ( Seongmin Ko ),박현재 ( Hyeon Jae Park ),이동현 ( Donghyun Lee ),신상민 ( Sangmin Shin ),조일국 ( Ilguk Jo ),이상관 ( Sang-kwan Lee ),이상복 ( Sang-bok Lee ) 한국복합재료학회 2018 Composites research Vol.31 No.4
본 연구에서는 용융가압함침 공정을 이용하여 TiC, TiB<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> 세라믹 입자가 분산된 SUS431 금속복합재료를 제조하고 미세조직을 분석하여 세라믹 입자에 따른 제조성에 대해 검토하였다. 젖음성이 나쁜 Al<sub>2</sub>O<sub>3</sub>의 경우 내부에 결함이 다수 존재함을 알 수 있었으며, TiB<sub>2</sub> 및 TiC 입자 강화 복합재의 경우 상대적으로 결함이 적고 강화재가 균일 분산되었음을 확인하였다. 특히, TiC-SUS431 복합재료의 경우 TiC와 Fe계 기지합금의 우수한 젖음성 및 용융가압함침공정 적용으로 우수한 계면 특성을 가지며 결함이 적고 균일한 미세조직을 가지는 것을 확인하였다. Various ceramic particulate such as TiC, TiB<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> reinforced SUS431 matrix composites were successfully fabricated by a novel liquid pressing infiltration process. Microstructures of the SUS431 composite were analyzed to determine manufacturability of composites. Al<sub>2</sub>O<sub>3</sub>-SUS431 composite had lots of defects due to poor wettability between the Al<sub>2</sub>O<sub>3</sub> and steel matrix. On the other hand, TiC was uniformly dispersed in the SUS431 matrix than TiB2 and Al<sub>2</sub>O<sub>3</sub> due to good wettability and interfacial properties.