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Kim, Kyoung-Min,Shin, Dongwoo,Sasaki, M.,Kim, Heon-Jung,Kim, Jeehoon,Kim, Ki-Seok American Physical Society 2016 Physical Review B Vol.94 No.8
<P>It is at the heart of modern condensed matter physics to investigate the role of a topological structure in anomalous transport phenomena. In particular, chiral anomaly turns out to be the underlying mechanism for the negative longitudinal magnetoresistivity in a Weyl metal phase. The existence of a dissipationless current channel causes enhancement of electric currents along the direction of a pair of Weyl points or applied magnetic fields (B). However, temperature (T) dependence of the negative longitudinal magnetoresistivity has not been understood yet in the presence of disorder scattering since it is not clear at all how to introduce effects of disorder scattering into the topological-in-origin transport coefficient at finite temperatures. The calculation based on the Kubo formula of the current-current correlation function is simply not known for this anomalous transport coefficient. Combining the renormalization group analysis with the Boltzmann transport theory to encode the chiral anomaly, we reveal how disorder scattering renormalizes the distance between a pair of Weyl points and such a renormalization effect modifies the topological-in-origin transport coefficient at finite temperatures. As a result, we find breakdown of B/T scaling, given by B/T1+eta with 0 < eta < 1. This breakdown may be regarded to be a fingerprint of the interplay between disorder scattering and topological structure in a Weyl metal phase.</P>
KIM, Bongtae,LEE, Kichan,HAN, Kiwon,KIM, Duyeol,HA, Yooncheol,KIM, Chung Hyun,OH, Yeonsu,KANG, Ikjae,LEE, Jeehoon,CHAE, Chanhee Japanese Society of Veterinary Science 2010 The Journal of veterinary medical science Vol.72 No.9
<P>The aim of this study was to develop <I>in situ</I> hybridization for detection of <I>Mycoplasma hyorhinis</I> in formalin-fixed, paraffin-wax-embedded tissues from pigs with polyserositis. <I>M. hyorhinis</I> was isolated from the spleen (2 pigs) and pericardium (1 pig). <I>M. hyorhinis</I> DNA was detected 16 out of 20 pigs with polyserositis. <I>In situ</I> hybridization produced a distinct positive signal for the <I>M. hyorhinis</I> p37 gene in inflammatory cells in the polyserositis. <I>In situ</I> hybridization developed in the present study present diagnostic tools capable of detection of <I>M. hyorhinis</I> in formalin-fixed, paraffin-wax-embedded tissues from the naturally infected pigs.</P>
Direct observation of the M2 phase with its Mott transition in a VO<sub>2</sub> film
Kim, Hoon,Slusar, Tetiana V.,Wulferding, Dirk,Yang, Ilkyu,Cho, Jin-Cheol,Lee, Minkyung,Choi, Hee Cheul,Jeong, Yoon Hee,Kim, Hyun-Tak,Kim, Jeehoon American Institute of Physics 2016 APPLIED PHYSICS LETTERS Vol.109 No.23
Nano-textured surfaces using hybrid micro- and nano-materials for efficient water cooling
Kim, Min-Woo,Kim, Tae Gun,Jo, Hong Seok,Lee, Jong-Gun,James, Scott C.,Choi, Mun Seok,Kim, Woo Yeong,Yang, Jae Sin,Choi, Jeehoon,Yoon, Sam S. Elsevier 2018 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.123 No.-
<P><B>Abstract</B></P> <P>Water cooling heat transfer was enhanced by texturing the heated surface with various micro- and nano-materials. The increased surface area by texturing facilitated not only enhanced convection, but also turbulent mixing, which increased the effective heat-transfer coefficient. A heated copper substrate was textured with electroplated copper oxide, sprayed silver nanowire, or sprayed copper micro-particles. Sprayed micro-particles were subsequently nano-textured by sand blasting with kanthal (Mo<SUB>2</SUB>Si) nanoparticles. Because of the extremely high hardness of kanthal, sand blasting dimpled the surface to increase the total surface area. Optimal texturing was identified for each material. Hybrid cases combining two different texturing materials were also investigated. All cases were quantitatively compared and that with the highest effective heat transfer was identified. Texturing materials were characterized by scanning electron microscopy and X-ray diffraction. The coating methods are simple, rapid, and scalable and may be cost-effective texturing schemes for various electronics cooling applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Water cooling heat transfer was enhanced by texturing the heated surface with various micro- and nano-materials. </LI> <LI> The increased surface area enhanced convection and turbulent mixing. </LI> <LI> A substrate was textured with electroplated copper oxide, sprayed silver nanowire or sprayed copper micro-particles. </LI> <LI> The texturing methods are appropriate for electronics cooling applications because of their simplicity and scalability. </LI> </UL> </P>
A Vision-based System for Monitoring Stroke Position of ES/DS in GIS
Jeehoon Park,Jeongbok Lee,Byoungwoon Min,Byeungjin Kim,Junghan Kim 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Nowadays, the needs of monitoring and diagnosing electrical facilities have grown fast in the industries and market due to maintenance and repair. Since Gas Insulated Switchgear(GIS) works in a high voltage environment and its malfunction during the operation causes severe damages around the electrical system, it is highly recommended to be managed soundness of GIS in several ways using electromagnetic or acoustic waves. Earthing Switch(ES) and Disconnection Switch(DS) used for inspection and maintenance are also critical components in the GIS, and the moving parts in these switches require considerable reliability and accuracy. In this article, authors propose a new monitory and diagnostic method based on vision system to ensure the reliability of opening and closing operation by detecting the current position of the stroke in the ES/DS. Vision sensor module composed of camera and light is designed as compatible to the existing view window. Images of the moving part captured by calibrated camera should be undistorted and processed to detect the current position of the stroke by recognizing specific pattern on the bar. Harris corner detector and Lucas-Kanade tracking algorithms are applied to extract exact position of the stroke in the images. Although, some issues have still remained in applying the proposed method to the real operating environment, authors confirm the possibility of the vision monitoring system and the algorithm. The proposed method would be sufficiently supportive to the reliable operation of ES/DS in GIS.