J. Y. Kim

Pusan National University, Tsau-liang-hai, Busan, South Korea

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Publications (606)1427.82 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Cu-based ternary chalcogenides such as Cu2SnS3 (CTS) are attracting increasing interest due to their outstanding opto-electronic properties. Herein, a simple, cost-effective non-vacuum mechanochemical synthetic route for preparing CTS nanocrystals with controlled size and composition is presented. CTS nanocrystalline powders were synthesized by ball milling and subsequent annealing in an H2S atmosphere. These nanocrystal samples were characterized using powder X-ray diffraction (P-XRD), Raman spectroscopy, ultraviolet–visible optical spectroscopy, energy-dispersive X-ray spectroscopy (EDS), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) techniques. Texture structures with cubic crystallinity were observed from the P-XRD of (1 1 2), (2 0 0) planes of CTS nanopowders. The EDS results confirmed that the synthesized powders had an appropriate chemical purity. According to TEM/FE-SEM observations, a nanostructure CTS was obtained after 36 h of mechanochemical processing followed by annealing. The average particle size of single phase CTS after 48 h of milling was ∼45 nm. Based on obtained data using characterization methods, reaction mechanism steps were proposed to clarify the reactions that occurred during the mechanochemical process. In order to prepare nanocrystal ink, ethanol was used as a solvent, and polyvinylpyrrolidone, which acts as an organic stabilizing agent, was added to the CTS powder to prepare a printable paste.
    Acta Materialia 02/2015; 85. · 3.94 Impact Factor
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    ABSTRACT: This experiment was carried out to investigate effects of onion extract on growth performance, meat quality and blood profiles of White mini broilers. Total of 600 one-d-old male White mini broiler chicks were divided into four groups and fed control diets (non-medicated commercial diet or antibiotics medicated) or experimental diets (non-medicated diets containing 0.3% or 0.5% onion extract) for 5 wks. The final body weight (BW) and weight gain of the group fed non-medicated control diet were lower than those of medicated control group (p<0.01). The chicks fed diet with 0.3% or 0.5% onion extract showed a similar BW to that of medicated control group. The relative weight of various organs, such as liver, spleen, bursa of Fabricius, abdominal fat, and the activities of serum enzymes were not affected by dietary treatments. There were no significant differences in meat color among groups. Whereas, groups fed diets containing onion extract had slightly lower cooking loss and higher shear force value, but not significantly. The concentrations of serum free cholesterol and triacylglycerol in groups fed diet containing onion extract were significantly decreased compared with those of controls (p<0.01). In conclusion, the onion extracts exerted a growth-promoting effect when added in White mini broiler diets, reflecting potential alternative substances to replace antibiotics.
    Asian Australasian Journal of Animal Sciences 02/2015; 28(2):247-51. · 0.56 Impact Factor
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    ABSTRACT: Cu2ZnSnS4; commonly abbreviated as CZTS is a promising material for low cost thin film solar cells, because of its suitable band gap energy of around 1.5 eV and large absorption coefficient of over 104 cm−1. All the constituents of this material are abundant in the earth’s crust, and they are not toxic making it a smarter choice. Since 1996, after the initial success of the CZTS based solar cell (with its light to electrical conversion efficiency of 0.6%), significant progress in this research area has been achieved, especially in the last five years. Now-a-days, the conversion efficiency of the CZTS thin film solar cell has improved to 12%. Over 600 papers on CZTS have been published since 2001, and the majority of these discuss the preparation of CZTS thin films by different methods. So far, many physical and chemical techniques have been employed for preparing CZTS thin films. Among them, the pulsed laser deposition (PLD) is a versatile deposition method. PLD is a simple, but multipurpose, experimental method that finds use as a means of modeling a very diverse range of materials, and in extensive areas of thin film deposition and multi-layer research. This technique is suitable for depositing high quality films with complex compositions because of its influencing properties such as harmonious transfer of species from the target to substrate, enrichment in crystallinity, clean deposition, and simplicity and flexibility in the engineering design. On the occasion of the 25th anniversary of PLD, this manuscript, reviews the synthesis of CZTS semiconductor thin films fabricated by PLD. This review begins with a description of the PLD system, and then introduces the CZTS and preparation of the CZTS target for PLD deposition. A survey of pulsed laser deposited CZTS thin films and their solar cell performance is discussed in detail. Finally, we present perspectives for further developments of PLD for a CZTS based solar cell absorber layer.
    Journal of Alloys and Compounds 01/2015; 619:109–121. · 2.73 Impact Factor
  • Current Applied Physics 12/2014; 14(12):1669–1676. · 2.03 Impact Factor
  • Optical Materials 11/2014; · 2.08 Impact Factor
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    Solid State Sciences 10/2014; · 1.68 Impact Factor
  • H J Kwak, J Y Kim
    Acta Anaesthesiologica Scandinavica 10/2014; 58(9):1159-60. · 2.36 Impact Factor
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    ABSTRACT: The production of jets associated to bottom quarks is measured for the first time in PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair. Jet spectra are reported in the transverse momentum (p_{T}) range of 80-250 GeV/c, and within pseudorapidity |η|<2. The nuclear modification factor (R_{AA}) calculated from these spectra shows a strong suppression in the b-jet yield in PbPb collisions relative to the yield observed in pp collisions at the same energy. The suppression persists to the largest values of p_{T} studied, and is centrality dependent. The R_{AA} is about 0.4 in the most central events, similar to previous observations for inclusive jets. This implies that jet quenching does not have a strong dependence on parton mass and flavor in the jet p_{T} range studied.
    Physical Review Letters 09/2014; 113(13):132301. · 7.73 Impact Factor
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    ABSTRACT: We present the results of searches for nucleon decay via n→ν[over ¯]π^{0} and p→ν[over ¯]π^{+} using data from a combined 172.8 kt·yr exposure of Super-Kamiokande-I,-II, and-III. We set lower limits on the partial lifetime for each of these modes: τ_{n→ν[over ¯]π^{0}}>1.1×10^{33} years and τ_{p→ν[over ¯]π^{+}}>3.9×10^{32} years at a 90% confidence level.
    Physical Review Letters 09/2014; 113(12):121802. · 7.73 Impact Factor
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    ABSTRACT: Dexmedetomidine can be used as a co-induction agent to facilitate laryngeal mask airway (LMA) insertion with minimal effect on respiratory function. The purpose of the study was to determine the median effective dose (ED50) of dexmedetomidine to facilitate LMA insertion during anaesthesia induction with propofol 2.0 mg/kg without neuromuscular blockade.
    Acta Anaesthesiologica Scandinavica 06/2014; · 2.36 Impact Factor
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    ABSTRACT: In ancient Goryeo celadon excavated from the kiln sites in the GangJin and Buan areas, the effect of the chemical composition and ionic state of Fe on the colour was evaluated by Mössbauer spectroscopy and chromaticity analysis. According to chromaticity analysis, the L* value (brightness) of the glaze was shown to be affected more by TiO2 and MnO than by Fe2O3, and the body was affected more by Fe2O3 than by TiO2. The a* value was found to be affected by Fe2O3 and TiO2 in the glaze, whereas there was hardly any change in the body according to the composition. As for the b* value, changes due to the composition were shown to be smaller than those for the L* and a* values. According to the Mössbauer spectroscopy results, as the quantities of TiO2 and Fe2O3 are increased, Fe2+/Fe3+ decreases; while the changes in Fe2+/Fe3+ with MnO and P2O5 are negligible. As the quantity of Fe2+/Fe3+ increases, the a* and b* values decrease, which results in the change of colour from red–yellow to blue–green. The characteristic green colour can be attributed to increased L* (brightness) and decreased a* and b* values (blue–green shift) due to the reduced Fe ion, which is mainly determined by the TiO2 and Fe2O3 contents.
    Archaeometry 06/2014; 56(3). · 1.33 Impact Factor
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    ABSTRACT: A search for WV gamma triple vector boson production is presented based on events containing a W boson decaying to a muon or an electron and a neutrino, a second V (W or Z) boson, and a photon. The data correspond to an integrated luminosity of 19.3 inverse femtobarns collected in 2012 with the CMS detector at the LHC in pp collisions at sqrt(s) = 8 TeV. An upper limit of 311 fb on the fiducial cross section for the WV gamma production process is obtained at 95% confidence level for photons with a transverse energy above 30 GeV and with an absolute value of pseudorapidity of less than 1.44. This limit is approximately a factor of 3.4 larger than the standard model predictions that are based on next-to-leading order QCD calculations. Since no evidence of anomalous WW gamma gamma or WWZ gamma quartic gauge boson couplings is found, this paper presents the first experimental limits on the dimension-8 parameter f[T,0] and the CP-conserving WWZ gamma parameters kappa[0,W] and kappa[C,W]. Limits are also obtained for the WW gamma gamma parameters a[0,W] and a[C,W].
    Physical Review D 04/2014; 90(3-ARTN 032008). · 4.86 Impact Factor
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    ABSTRACT: Inflammatory demyelinating disease (IDD), which includes multiple sclerosis (MS) and neuromyelitis optica (NMO), affects the central nervous system. Chemokine ligand 2 (CCL2/MCP-1) is considered an important contributor to the development or progression of IDD. However, genetic association studies of Asian populations are lacking. In this study, we investigated a possible association between CCL2 polymorphisms (rs1024611, rs28730833, and rs2857657) and a Korean population (178 IDD patients and 237 healthy controls) using multiple logistic regression models. However, we did not find any association, which was consistent with other studies in Caucasian populations. In conclusion, our results suggest that CCL2 variants may not contribute to the pathogenesis of IDD.
    Tissue Antigens 04/2014; · 2.35 Impact Factor
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    ABSTRACT: Aerothermodynamic characteristics of re-entry vehicles in hypersonic speed regimes are investigated by applying CFD methods based on the Navier-Stokes-Fourier equations. A special emphasis is placed on the effects of high temperature chemically reacting gases on shock stand-off distance and thermal characteristics of the flowfields. A ten species model is used for describing the kinetic mechanism for high temperature air. In particular, the hypersonic flows around a cylinder are computed with and without chemically reacting effects. It is shown that, when the chemically reacting effects are taken into account, the shock stand-off distance and temperature are significantly reduced.
    Journal of computational fluids engineering. 03/2014; 19(1).
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    ABSTRACT: Results are presented from a search for the production of a heavy gauge boson W' decaying into a top and a bottom quark, using a data set collected by the CMS experiment at sqrt(s)=8 TeV and corresponding to an integrated luminosity of 19.5 inverse femtobarns. Various models of W'-boson production are studied by allowing for an arbitrary combination of left- and right-handed couplings. The analysis is based on the detection of events with a lepton (e, mu), jets, and missing transverse energy in the final state. No evidence for W'-boson production is found and 95% confidence level upper limits on the production cross section times branching fraction are obtained. For W' bosons with purely right-handed couplings, and for those with left-handed couplings assuming no interference effects, the observed 95% confidence level limit is M(W')>2.05 TeV. For W' bosons with purely left-handed couplings, including interference effects, the observed 95% confidence level limit is M(W')>1.84 TeV. The results presented in this paper are the most stringent limits published to date.
    JHEP. 02/2014; 1405.
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    ABSTRACT: In this paper, we introduce methods which can effectively enhance the adhesion between polyphenylene sulfide (PPS) and bulk Cu. One of the methods involved the thermal evaporation of PPS to form a buffer layer on Cu and the other involved plasma treatment with reactive gases such as O2, H2, and N2 on the PPS buffer layer. The adhesion strength of samples prepared by PPS thin film coating (∼26 MPa) was largely enhanced when compared to that of samples obtained by only etching (∼15 MPa). Among the samples obtained by plasma treatment using various reactive gases, the samples treated using H2 plasma showed the best adhesion strength (of ∼32 MPa) in comparison to the other samples owing to the adhesion between hydrophobic surfaces.
    Current Applied Physics 01/2014; 14(1):118–121. · 2.03 Impact Factor
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    ABSTRACT: Measurements of the muon charge asymmetry in inclusive pp to WX production at sqrt(s)=7 TeV are presented. The data sample corresponds to an integrated luminosity of 4.7 inverse femtobarns recorded with the CMS detector at the LHC. With a sample of more than twenty million W to mu mu events, the statistical precision is greatly improved in comparison to previous measurements. These new results provide additional constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10E-3 to 10E-1. These measurements and the recent CMS measurement of associated W + charm production are used together with the cross sections for inclusive deep inelastic ep scattering at HERA in a next-to-leading-order QCD analysis. The determination of the valence quark distributions is improved, and the strange-quark distribution is probed directly through the leading-order process g + c to W + c in proton-proton collisions at the LHC.
    Physical Review D 01/2014; 90(3-ARTN 032004). · 4.86 Impact Factor
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    J. Seo, D. Youn, J. Y. Kim, H. Lee
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    ABSTRACT: Spatio-temporal characteristics of surface ozone (O3) variations over South Korea are investigated with consideration of meteorological factors and time-scales based on the Kolmogorov-Zurbenko filter (KZ-filter), using measurement data at 124 air quality monitoring sites and 72 weather stations for the 12 yr period of 1999-2010. In general, O3 levels at coastal cities are high due to dynamic effects of the sea breeze while those at the inland and Seoul Metropolitan Area (SMA) cities are low due to the NOx titration by local precursor emissions. We examine the meteorological influences on the O3 using a combined analysis of the KZ-filter and linear regressions between O3 and meteorological variables. We decomposed O3 time-series at each site into short-term, seasonal, and long-term components by the KZ-filter and regressed them on meteorological variables. Impact of temperature on the O3 levels is significantly high in the highly populated SMA and inland region while that is low in the coastal region. In particular, the probability of high-O3 occurrence doubled with 4 °C of temperature increase in the SMA during high-O3 months (May to October). It implies that those regions will experience frequent high-O3 events in the future warming climate. In terms of short-term variation, distribution of high-O3 probability classified by wind direction shows the effect of both local precursor emissions and long-range transport from China. In terms of long-term variation, the O3 concentrations have increased by +0.26 ppbv yr-1 on nationwide average, but their trends show large spatial variability. Additional statistical analysis of the singular value decomposition further reveals that the long-term temporal evolution of O3 is similar to that of the nitrogen dioxide measurement although the spatial distributions of their trends are different. This study would be helpful as a reference for diagnostics and evaluation of regional- and local-scale O3 and climate simulations and a guide to appropriate O3 control policy in South Korea.
    Atmospheric Chemistry and Physics 12/2013; 14(1). · 5.51 Impact Factor
  • 12/2013; 112(1).
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    ABSTRACT: Giant particles transported over long distances are generally of limited concern in atmospheric studies due to their low number concentrations in mineral dust and possible local origin. However, they can play an important role in regional circulation of earth materials due to their enormous volume concentration. Asian dust laden with giant particles was observed in Korea on 31 March 2012, after a migration of about 2000 km across the Yellow Sea from the Gobi Desert. Scanning electron microscopy (SEM) revealed that 20% of the particles exceeded 10 μm in equivalent sphere diameter, with a maximum of 60 μm. The median diameter from the number distribution was 5.7 μm, which was larger than the diameters recorded of 2.5 and 2.9 μm in Asian dust storms in 2010 and 2011, respectively, and was consistent with independent optical particle counter data. Giant particles (>10 μm) contributed about 89% of the volume of the dust in the 2012 storm. Illite-smectite series clay minerals were the major mineral group followed by quartz, plagioclase, K-feldspar, and calcite. The total phyllosilicate content was ~52%. The direct long-range transport of giant particles was confirmed by calcite nanofibers closely associated with clays in a submicron scale identified by high-resolution SEM and transmission electron microscopy. Since giant particles consisted of clay agglomerates and clay-coated quartz, feldspars, and micas, the mineral composition varied little throughout the fine (<5 μm), coarse (5-10 μm), giant-S (10-20 μm), and giant-L (>20 μm) size bins. Analysis of the synoptic conditions of the 2012 dust event and its migration indicated that the mid-tropospheric strong wind belt directly stretching to Korea induced rapid transport of the dust, delivering giant particles. Giant dust particles with high settling velocity would be the major input into the terrestrial and marine sedimentary and ecological systems of East Asia and the western Pacific. Analysis of ancient aeolian deposits in Korea suggested the common deposition of giant particles from Asian dust through the late Quaternary Period. The roles of giant particles should be reviewed with regard to regional circulation of mineral particles and nutrients.
    Atmospheric Chemistry and Physics 12/2013; 14(1). · 4.88 Impact Factor

Publication Stats

5k Citations
1,427.82 Total Impact Points


  • 2014
    • Pusan National University
      • College of Nanoscience and Nanotechnology
      Tsau-liang-hai, Busan, South Korea
  • 1995–2014
    • Ajou University
      • • Department of Anesthesiology and Pain Medicine
      • • Department of Medicine
      Sŏul, Seoul, South Korea
  • 1979–2014
    • Chonnam National University
      • • Department of Electrical, Electronic Communication and Computer Engineering
      • • Department of Physics
      Gwangju, Gwangju, South Korea
  • 2013
    • National Cancer Center Korea
      Kōyō, Gyeonggi Province, South Korea
    • University of Ulsan
      • College of Medicine
      Urusan, Ulsan, South Korea
    • Inje University Paik Hospital
      Sŏul, Seoul, South Korea
  • 2012–2013
    • Sejong University
      • Department of Physics
      Sŏul, Seoul, South Korea
    • CHA University
      Sŏul, Seoul, South Korea
    • National Academy of Sciences of Ukraine
      • Institute for Nuclear Research
      Kievo, Kyiv City, Ukraine
  • 2011–2013
    • Pohang Accelerator Laboratory
      Urusan, Ulsan, South Korea
    • Chung-Ang University Hospital
      Sŏul, Seoul, South Korea
    • Keimyung University
      Sŏul, Seoul, South Korea
    • Harbin Institute of Technology
      Charbin, Heilongjiang Sheng, China
    • Research Institute of Industrial Science and Technology
      Sŏul, Seoul, South Korea
  • 2007–2013
    • Hoseo University
      Onyang, South Chungcheong, South Korea
    • Korea Research Institute of Standards and Science
      Daiden, Daejeon, South Korea
    • Yeungnam University
      • Department of Physiology
      Daikyū, Daegu, South Korea
  • 2000–2013
    • Korea Institute of Science and Technology
      Sŏul, Seoul, South Korea
    • Mokwon University
      Daiden, Daejeon, South Korea
  • 1993–2013
    • Pohang University of Science and Technology
      • • Pohang Accelerator Laboratory
      • • Department of Physics
      Antō, North Gyeongsang, South Korea
    • Kyung Hee University
      • Department of Genetic Engineering
      Sŏul, Seoul, South Korea
  • 2011–2012
    • Seoul National University of Science and Technology
      Sŏul, Seoul, South Korea
  • 2010–2012
    • Yerevan Physics Institute
      Ayrivan, Yerevan, Armenia
  • 2009–2012
    • Konkuk University
      • • Department of Laboratory Medicine
      • • College of Animal Bioscience and Technology
      Sŏul, Seoul, South Korea
  • 2008–2012
    • Sungkyunkwan University
      • • School of Medicine
      • • Department of Pediatrics
      Seoul, Seoul, South Korea
  • 2006–2011
    • National Fusion Research Institute
      • WCI Fusion Theory Center
      Daiden, Daejeon, South Korea
    • Incheon St. Mary’s Hospital, Catholic Medical Center
      Bucheon, Gyeonggi Province, South Korea
    • Simon Fraser University
      • School of Engineering Science
      Burnaby, British Columbia, Canada
    • Hallym University
      Sŏul, Seoul, South Korea
  • 2001–2011
    • Kwangwoon University
      • • Department of Electronic Material Engineering
      • • Department of Radio Sciences & Engineering
      Sŏul, Seoul, South Korea
    • Kyoto University
      • Department of Physics II
      Kyoto, Kyoto-fu, Japan
    • Korea Advanced Institute of Science and Technology
      Sŏul, Seoul, South Korea
    • Catholic University of Korea
      Sŏul, Seoul, South Korea
    • University of Illinois, Urbana-Champaign
      Urbana, Illinois, United States
  • 1997–2011
    • Seoul National University Hospital
      • • Department of Laboratory Medicine
      • • Department of Ophthalmology
      Seoul, Seoul, South Korea
  • 2009–2010
    • Gachon University
      • Department of Anesthesiology
      Seongnam, Gyeonggi, South Korea
  • 2005–2010
    • Gwangju Institute of Science and Technology
      • School of Materials Science and Engineering
      Gwangju, Gwangju, South Korea
    • Autonomous University of Barcelona
      Cerdanyola del Vallès, Catalonia, Spain
    • Seoul Medical Center
      Sŏul, Seoul, South Korea
  • 2000–2010
    • Yonsei University Hospital
      • • Surgery
      • • Department of Internal Medicine
      Seoul, Seoul, South Korea
  • 1998–2010
    • Yonsei University
      • • Research Institute for Trasplantation
      • • Department of Electrical and Electronic Engineering
      • • Department of Physics
      • • Department of Obstetrics and Gynecology
      • • Department of Chemistry
      • • Department of Neurology
      Seoul, Seoul, South Korea
  • 2000–2009
    • Wonkwang University
      • • College of Pharmacy
      • • Medicinal Resources Research Center (MRRC)
      Iksan, North Jeolla, South Korea
    • Hanyang University
      • Department of Physics
      Sŏul, Seoul, South Korea
  • 2005–2007
    • Humboldt-Universität zu Berlin
      • Department of Physics
      Berlin, Land Berlin, Germany
  • 2000–2007
    • Seoul National University
      • • School of Chemical and Biological Engineering
      • • Department of Food and Animal Biotechnology
      Seoul, Seoul, South Korea
  • 1995–2007
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi Province, South Korea
  • 2004–2006
    • Korea Institute of Machinery and Materials
      Sŏul, Seoul, South Korea
    • The University of Tokyo
      • Institute for Cosmic Ray Research
      Tokyo, Tokyo-to, Japan
    • University of Incheon
      • Department of Physics
      Sŏul, Seoul, South Korea
  • 2001–2006
    • Uiduk University
      South Korea
  • 1999–2006
    • Korea Basic Science Institute KBSI
      Sŏul, Seoul, South Korea
  • 1998–2004
    • Chonbuk National University
      • • Department of Chemical Engineering
      • • Semiconductor Physics Research Center
      Seoul, Seoul, South Korea
  • 2003
    • Chungbuk National University
      • Department of Physics
      Chinsen, North Chungcheong, South Korea
  • 1999–2003
    • Kookmin University
      • School of Advanced Materials Engineering
      Sŏul, Seoul, South Korea
  • 1998–2003
    • Korea University
      • • Department of Biotechnology
      • • Department of Physics
      • • Department of Chemical and Biological Engineering
      Sŏul, Seoul, South Korea
  • 2000–2001
    • Chungnam National University
      • Department of Microbiology
      Seongnam, Gyeonggi, South Korea
  • 1995–2001
    • Jeonju National University of Education
      Tsiuentcheou, North Jeolla, South Korea
  • 1994–2001
    • Chonnam National University Hospital
      Sŏul, Seoul, South Korea
  • 1993–1999
    • University of Kentucky
      • Department of Chemical and Materials Engineering
      Lexington, Kentucky, United States
  • 1997–1998
    • Ewha Womans University
      • Department of Physics
      Sŏul, Seoul, South Korea
  • 1996
    • Gyeongsang National University
      Shinshū, South Gyeongsang, South Korea
  • 1990
    • University of California, Davis
      • Department of Chemical Engineering and Materials Science
      Davis, CA, United States