Phase-change Current-voltage Characteristic of Ge2Sb2 Te5 Nanoparticle-clusters for Nano-scale Non-vilatile Memories (초)

( William Jo ),( Ah Reum Jeong ),( Yoo Jin Oh ),( Hye Ran Yoon ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 대한금속재료학회 학술대회 개요집 Vol.2007 No.1

IBAD-MgO technology for coated conductors

Jo, William The Korea Institute of Applied Superconductivity a 2016 한국초전도저온공학회논문지 Vol.18 No.3

Ion-beam assisted deposition (IBAD) technology has been successfully applied to high-temperature superconductor coated conductors (CC) as textured substrates. Since the coated conductors were proposed as a potential framework for utilizing the superior transport characteristics of $YBa_2Cu_3O_7$ and related cuprate oxides, several methods including rolling-assisted bi-axial textured substrates (RABiTS) and inclined substrate deposition (ISD), as well as IBAD, have been attempted. As of 2016, most companies that are trying to commercialize CC adapt IBAD technology except for American Superconductors who use RABiTS predominantly. For the materials in the IBAD process, initial efforts to use yttria-stabilized zirconia (YSZ) or related fluorites in Fujikura in Japan have quickly given way to MgO which technique was developed by Stanford University in the USA. In this review, we present a historical overview of IBAD technology, in particular, for the application of CC. We describe the key scientific understanding of nucleation, the texturing mechanism, and the growth of large bi-axial grains and discuss some potential new IBAD materials and systems for large-scale production.

IBAD-MgO technology for coated conductors

William Jo 한국초전도저온학회 (구 한국초전도저온공학회) 2016 한국초전도저온공학회논문지 Vol.18 No.3

Evaluation of three different standard head-related transfer functions using an elevation discrimination task for virtual sources displayed in the median plane

Hyun Jo,William L. Martens,Youngjin Park 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

The performance in controlling elevation effect of virtual sources displayed in the median plane was tested for three different sets of standard head-related transfer functions (HRTFs) using an elevation discrimination task. The three candidate sets compared included a representative subject’s customized head-related impulse response (HRIR), mean-HRIR derived from the CIPIC database, and mean-HRIR of individually customized HRIRs proposed by Jo et al. [7]. The goal of the current study was to find the best standard HRTF dataset for many listeners, with particular emphasis on its ability to work well without requiring a given listener to engage in any customization procedure. A two interval two alternative forced choice (2-AFC) discrimination for virtual source elevation was used to find how easy it was for subjects to distinguish between elevation angles within 15 or 30 degrees of each other. The simple question asked of each subject was “Which sound source is perceived as higher between the two presented.” To compare the performance of elevation discrimination, individually measured HRTF, individually customized HRTF, and HRTF of KEMAR dummy were also used. The results from six subjects showed that even though the listeners’ own measured HRTFs were used, they could not discriminate elevation well for sources differing only in terms of polar angle in the median plane. Similar poor performance was observed when using HRIRs from KEMAR. With regard to the search for standard filters for general use across listeners, a representative subject’s customized HRTF, which was based on the method provided by Hwang, et al. [8] was preferred as it supported the best discrimination performance between the tested candidate HRTF datasets.

[학회 참가기] IUPAP2022 총회 참가기

조윌렴(William JO) 한국물리학회 2022 물리학과 첨단기술 Vol.31 No.11

Use of flow cytometry to develop and characterize a set of monoclonal antibodies specific for rabbit leukocyte differentiation molecules

William C. Davis,Mary Jo Hamilton 대한수의학회 2008 Journal of Veterinary Science Vol.9 No.1

Flow cytometry was used to identify and characterize monoclonal antibodies (mAbs) that react with rabbit leukocyte differentiation molecules (LDM). Screening sets of mAbs, developed against LDM in other species, for reactivity with rabbit LDM yielded 11 mAbs that recognize conserved epitopes on rabbit LDM orthologues and multiple mAbs that recognize epitopes expressed on the major histocompatibility class I or class II molecules. Screening of mAbs submitted to the Animal Homologues Section of the Eighth Human Leukocyte Differentiation Workshop yielded 7 additional mAbs. Screening of mAbs generated from mice immunized with leukocytes from rabbit thymus or spleen or concanavalin A activated peripheral blood and/or spleen lymphocytes has yielded 42 mAbs that recognize species restricted epitopes expressed on one or more lineages of leukocytes. Screening of the anti-rabbit mAbs against leukocytes from other species yielded one additional mAb. The studies show that screening of existing sets of mAbs for reactivity with rabbit LDM will not be productive and that a direct approach will be needed to develop mAbs for research in rabbits. The flow cytometric approach we developed to screen for mAbs of interest offers a way for individual laboratories to identify and characterize mAbs to LDM in rabbits and other species. A web-based program we developed provides a source of information that will facilitate analysis. It contains a searchable data base on known CD molecules and a data base on mAbs, known to react with LDM in one or more species of artiodactyla, equidae, carnivora, and or lagomorpha. Flow cytometry was used to identify and characterize monoclonal antibodies (mAbs) that react with rabbit leukocyte differentiation molecules (LDM). Screening sets of mAbs, developed against LDM in other species, for reactivity with rabbit LDM yielded 11 mAbs that recognize conserved epitopes on rabbit LDM orthologues and multiple mAbs that recognize epitopes expressed on the major histocompatibility class I or class II molecules. Screening of mAbs submitted to the Animal Homologues Section of the Eighth Human Leukocyte Differentiation Workshop yielded 7 additional mAbs. Screening of mAbs generated from mice immunized with leukocytes from rabbit thymus or spleen or concanavalin A activated peripheral blood and/or spleen lymphocytes has yielded 42 mAbs that recognize species restricted epitopes expressed on one or more lineages of leukocytes. Screening of the anti-rabbit mAbs against leukocytes from other species yielded one additional mAb. The studies show that screening of existing sets of mAbs for reactivity with rabbit LDM will not be productive and that a direct approach will be needed to develop mAbs for research in rabbits. The flow cytometric approach we developed to screen for mAbs of interest offers a way for individual laboratories to identify and characterize mAbs to LDM in rabbits and other species. A web-based program we developed provides a source of information that will facilitate analysis. It contains a searchable data base on known CD molecules and a data base on mAbs, known to react with LDM in one or more species of artiodactyla, equidae, carnivora, and or lagomorpha.

Plasmodesmal receptor-like kinases identified through analysis of rice cell wall extracted proteins

Jo, Yeonhwa,Cho, Won Kyong,Rim, Yeonggil,Moon, Juyeon,Chen, Xiong-Yan,Chu, Hyosub,Kim, Cha Young,Park, Zee-Yong,Lucas, William J.,Kim, Jae-Yean Springer Vienna 2011 Protoplasma Vol.248 No.1

<P>In plants, plasmodesmata (PD) are intercellular channels that function in both metabolite exchange and the transport of proteins and RNAs. Currently, many of the PD structural and regulatory components remain to be elucidated. Receptor-like kinases (RLKs) belonging to a notably expanded protein family in plants compared to the animal kingdom have been shown to play important roles in plant growth, development, pathogen resistance, and cell death. In this study, cell biological approaches were used to identify potential PD-associated RLK proteins among proteins contained within cell walls isolated from rice callus cultured cells. A total of 15 rice RLKs were investigated to determine their subcellular localization, using an <I>Agrobacterium</I>-mediated transient expression system. Of these six PD-associated RLKs were identified based on their co-localization with a viral movement protein that served as a PD marker, plasmolysis experiments, and subcellular localization at points of wall contact between spongy mesophyll cells. These findings suggest potential PD functions in apoplasmic signaling in response to environmental stimuli and developmental inputs.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s00709-010-0251-4) contains supplementary material, which is available to authorized users.</P>

Hydroxyapatite precipitation on nanotube surfaces of Ti-35Ta-xNb alloys.

Jo, Chae-Ik,Jeong, Yong-Hoon,Brantley, William A,Choe, Han-Cheol American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.10

<P>Hydroxyapatite precipitation on nanotube surfaces of Ti-35Ta-xNb alloys was investigated using electrochemical methods. The alloys were prepared by arc-melting, heat treated at 1050 degrees C for 12 h in an Ar atmosphere, and quenched in 0 degrees C water. Nanotubes were created on the Ti-35Ta-xNb alloys in a 1 M H3PO4 + 1.2 wt.% NaF electrolyte at room temperature. Hydroxyapatite precipitation was carried out in a 0.03 M Ca(NO3)2 x 4H2O + 0.018 M NH4H2PO4 solution at 80 1 degrees C, using 10 deposition cycles. Information about morphology and composition was obtained by FE-SEM and EDS. The microstructure of the Ti-35Ta-xNb alloys was transformed from α phase to βphase as the Nb content increased. The HA precipitates had a plate-like morphology on bulk Ti-35Ta-xNb alloys and a flower-like morphology on nanotubular Ti-35Ta-xNb alloys.</P>

Local transport properties of coated conductors by laser-scan imaging methods

Gracia Kim,William Jo,Dahyun Nam,Hyeonsik Cheong,Seoung Hyun Moon 한국초전도저온학회 (구 한국초전도저온공학회) 2016 한국초전도저온공학회논문지 Vol.18 No.2

Local transport properties of coated conductors by laser-scan imaging methods

Kim, Gracia,Jo, William,Nam, Dahyun,Cheong, Hyeonsik,Moon, Seoung Hyun The Korea Institute of Applied Superconductivity a 2016 한국초전도저온공학회논문지 Vol.18 No.2

To observe the superconducting current and structural properties of high critical temperature ($T_c$) superconductors (HTS), we suggest the following imaging methods: Room temperature imaging (RTI) through thermal heating, low-temperature bolometric microscopy (LTBM) and Raman scattering imaging. RTI and LTBM images visualize thermal-electric voltages as different thermal gradients at room temperature (RT) and superconducting current dissipation at near-$T_c$, respectively. Using RTI, we can obtain structural information about the surface uniformity and positions of impurities. LTBM images show the flux flow in two dimensions as a function of the local critical currents. Raman imaging is transformed from Raman survey spectra in particular areas, and the Raman vibration modes can be combined. Raman imaging can quantify the vibration modes of the areas. Therefore, we demonstrate the spatial transport properties of superconducting materials by combining the results. In addition, this enables visualization of the effect of current flow on the distribution of impurities in a uniform superconducting crystalline material. These imaging methods facilitate direct examination of the local properties of superconducting materials and wires.