J H Kang

Kookmin University, Sŏul, Seoul, South Korea

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Publications (883)

  • Article · Dec 2016
  • A. Adare · S. Afanasiev · C. Aidala · [...] · L. Zou
    Article · Dec 2016
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    [Show abstract] [Hide abstract] ABSTRACT: We report results on the studies of the $e^+e^-\to B_s^{(*)}\bar{B}_s^{(*)}$ processes. The results are based on a $121.4$ fb$^{-1}$ data sample collected with the Belle detector at the center-of-mass energy near the $\Upsilon(10860)$ peak and $16.4$ fb$^{-1}$ of data collected at 19 energy points in the range from 10.77 to 11.02 GeV. We observe a clear $e^+e^-\to\Upsilon(10860)\to B_s^{(*)}\bar{B}_s^{(*)}$ signal, with no statistically significant signal of $e^+e^-\to \Upsilon(11020)\to B_s^{(*)}\bar{B}_s^{(*)}$. The relative production ratio of $B_s^*\bar{B}_s^*$, $B_s\bar{B}_s^{*}$, and $B_s\bar{B}_s$ final states at $\sqrt{s}=10.866$ GeV is measured to be $7:$ $0.856\pm0.106(stat.)\pm0.053(syst.):$ $0.645\pm0.094(stat.)^{+0.030}_{-0.033}(syst.)$. An angular analysis of the $B_s^*\bar{B}_s^*$ final state produced at the $\Upsilon(10860)$ peak is also performed.
    Full-text available · Article · Sep 2016
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    [Show abstract] [Hide abstract] ABSTRACT: We report the transverse energy (ET) measured with ALICE at midrapidity in Pb-Pb collisions at√sNN=2.76 TeV as a function of centrality. The transverse energy was measured using identified single-particle tracks.The measurement was cross checked using the electromagnetic calorimeters and the transverse momentum distributions of identified particles previously reported by ALICE. The results are compared to theoretical models as well as to results from other experiments. The mean ET per unit pseudorapidity (η), dET/dη, in 0%–5% central collisions is 1737±6(stat.)±97(sys.) GeV. We find a similar centrality dependence of the shape dET/dη as a function of the number of participating nucleons to that seen at lower energies. The growth in dET/dη at the LHC energies exceeds extrapolations of low-energy data. We observe a nearly linear scaling of dET/dη with the number of quark participants. With the canonical assumption of a 1 fm/c formation time, we estimate that the energy density in 0%–5% central Pb-Pb collisions at√sNN=2.76 TeV is 12.3±1.0 GeV/fm3 and that the energy density at the most central 80 fm2 of the collision is at least 21.5±1.7 GeV/fm3.This is roughly 2.3 times that observed in 0%–5% central Au-Au collisions at√sNN=200 GeV.
    Full-text available · Article · Sep 2016
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    [Show abstract] [Hide abstract] ABSTRACT: We report a search for $B^{0}\to \eta \eta $ with a data sample corresponding to an integrated luminosity of $698 \,{\rm fb}^{-1}$ containing $753 \times 10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The branching fraction is measured to be $\mathcal{B}(B^{0} \to \eta \eta ) = (7.6^{+2.7 +1.4}_{-2.3 -1.6}) \times 10^{-7}$ at the level of 3.3 standard deviations above zero, which provides the first evidence for the decay $B^{0} \to \eta \eta$.
    Full-text available · Article · Sep 2016
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    [Show abstract] [Hide abstract] ABSTRACT: The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| < 0.7) is measured in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV with ALICE at the LHC. The particle azimuthal distribution with respect to the reaction plane can be parametrized with a Fourier expansion, where the second coefficient (v2) represents the elliptic flow. The v2 coefficient of inclusive electrons is measured in three centrality classes (0–10%, 10–20% and 20–40%) with the event plane and the scalar product methods in the transverse momentum (pT) intervals 0.5–13 GeV/c and 0.5–8 GeV/c, respectively. After subtracting the background, mainly from photon conversions and Dalitz decays of neutral mesons, a positive v2 of electrons from heavy-flavour hadron decays is observed in all centrality classes, with a maximum significance of 5.9σ in the interval 2 < pT < 2.5 GeV/c in semi-central collisions (20–40%). The value of v2 decreases towards more central collisions at low and intermediate pT (0.5 < pT < 3 GeV/c). The v2 of electrons from heavy-flavour hadron decays at mid-rapidity is found to be similar to the one of muons from heavy-flavour hadron decays at forward rapidity (2.5 < y < 4). The results are described within uncertainties by model calculations including substantial elastic interactions of heavy quarks with an expanding strongly-interacting medium.
    Full-text available · Article · Sep 2016 · Journal of High Energy Physics
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    [Show abstract] [Hide abstract] ABSTRACT: The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and \( \mathrm{p}+\overline{\mathrm{p}} \) in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3 < pT< 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT< 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.
    Full-text available · Article · Sep 2016 · Journal of High Energy Physics
  • [Show abstract] [Hide abstract] ABSTRACT: We report the first measurement of the $\tau$ lepton polarization in the decay ${\bar B} \rightarrow D^* \tau^- {\bar\nu_{\tau}}$ as well as a new measurement of the ratio of the branching fractions $R(D^{*}) = \mathcal{B}({\bar B} \rightarrow D^* \tau^- {\bar\nu_{\tau}}) / \mathcal{B}({\bar B} \rightarrow D^* \ell^- {\bar\nu_{\ell}})$, where $\ell^-$ denotes an electron or a muon, with the decays $\tau^- \rightarrow \pi^- \nu_{\tau}$ and $\tau^- \rightarrow \rho^- \nu_{\tau}$. We use the full data sample of $772 \times 10^6$ $B{\bar B}$ pairs accumulated with the Belle detector at the KEKB electron-positron collider. Our preliminary results, $R(D^*) = 0.276 \pm 0.034{\rm (stat.)} ^{+0.029} _{-0.026}{\rm (syst.)}$ and $P_{\tau} = -0.44 \pm 0.47 {\rm (stat.)} ^{+0.20} _{-0.17} {\rm (syst.)}$, are consistent with the theoretical predictions of the Standard Model within $0.6$ standard deviation.
    Article · Aug 2016
  • [Show abstract] [Hide abstract] ABSTRACT: The measurement of prompt D-meson production as a function of multiplicity in p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV with the ALICE detector at the LHC is reported. D0, D+ and D∗+ mesons are reconstructed via their hadronic decay channels in the centre-of-mass rapidity range −0.96 < ycms< 0.04 and transverse momentum interval 1<pT<24 GeV/c. The multiplicity dependence of D-meson production is examined by either comparing yields in p-Pb collisions in different event classes, selected based on the multiplicity of produced particles or zero-degree energy, with those in pp collisions, scaled by the number of binary nucleon-nucleon collisions (nuclear modification factor); as well as by evaluating the per-event yields in p-Pb collisions in different multiplicity intervals normalised to the multiplicity-integrated ones (relative yields). The nuclear modification factors for D0, D+ and D∗+ are consistent with one another. The D-meson nuclear modification factors as a function of the zero-degree energy are consistent with unity within uncertainties in the measured pT regions and event classes. The relative D-meson yields, calculated in various pT intervals, increase as a function of the charged-particle multiplicity. The results are compared with the equivalent pp measurements at \( \sqrt{s}=7 \) TeV as well as with EPOS 3 calculations.
    Article · Aug 2016 · Journal of High Energy Physics
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    [Show abstract] [Hide abstract] ABSTRACT: The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity (−0.5<y<0) in p–Pb collisions at sNN=5.02 TeV using the ALICE detector at the LHC. Exploiting particle identification capabilities at high transverse momentum (pT), the previously published pT spectra have been extended to include measurements up to 20 ,GeV/c for seven event multiplicity classes. The pT spectra for pp collisions at s=7 TeV, needed to interpolate a pp reference spectrum, have also been extended up to 20 GeV/c to measure the nuclear modification factor (RpPb) in non-single diffractive p–Pb collisions.
    Full-text available · Article · Jul 2016 · Physics Letters B
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    [Show abstract] [Hide abstract] ABSTRACT: We present measurements of the elliptic (v2), triangular (v3) and quadrangular (v4) anisotropic azimuthal flow over a wide range of pseudorapidities (−3.5<η<5). The measurements are performed with Pb–Pb collisions at sNN=2.76 TeV using the ALICE detector at the Large Hadron Collider (LHC). The flow harmonics are obtained using two- and four-particle correlations from nine different centrality intervals covering central to peripheral collisions. We find that the shape of vn(η) is largely independent of centrality for the flow harmonics n=2−4, however the higher harmonics fall off more steeply with increasing |η|. We assess the validity of extended longitudinal scaling of v2 by comparing to lower energy measurements, and find that the higher harmonic flow coefficients are proportional to the charged particle densities at larger pseudorapidities. Finally, we compare our measurements to both hydrodynamical and transport models, and find they both have challenges when it comes to describing our data.
    Full-text available · Article · Jul 2016 · Physics Letters B
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    [Show abstract] [Hide abstract] ABSTRACT: We report the double helicity asymmetry, $A_{LL}^{J/\psi}$, in inclusive $J/\psi$ production at forward rapidity as a function of transverse momentum $p_T$ and rapidity $|y|$. The data analyzed were taken during $\sqrt{s}=510$ GeV longitudinally polarized $p$$+$$p$ collisions at the Relativistic Heavy Ion Collider (RHIC) in the 2013 run using the PHENIX detector. At this collision energy, $J/\psi$ particles are predominantly produced through gluon-gluon scatterings, thus $A_{LL}^{J/\psi}$ is sensitive to the gluon polarization inside the proton. We measured $A_{LL}^{J/\psi}$ by detecting the decay daughter muon pairs $\mu^+ \mu^-$ within the PHENIX muon spectrometers in the rapidity range $1.2<|y|<2.2$. In this kinematic range, we measured the $A_{LL}^{J/\psi}$ to be $0.012 \pm 0.010$~(stat)~$\pm$~$0.003$(syst). The $A_{LL}^{J/\psi}$ can be expressed to be proportional to the product of the gluon polarization distributions at two distinct ranges of Bjorken $x$: one at moderate range $x \approx 0.05$ where recent RHIC data of jet and $\pi^0$ double helicity spin asymmetries have shown evidence for significant gluon polarization, and the other one covering the poorly known small-$x$ region $x \approx 2\times 10^{-3}$. Thus our new results could be used to further constrain the gluon polarization for $x< 0.05$.
    Full-text available · Article · Jun 2016
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    [Show abstract] [Hide abstract] ABSTRACT: We report a study of radiative decays of \chi_{bJ}(1P)(J=0,1,2) mesons into 74 hadronic final states comprising charged and neutral pions, kaons, protons; out of these, 41 modes are observed with at least 5 standard deviation significance. Our measurements not only improve the previous measurements by the CLEO Collaboration but also lead to first observations in many new modes. The large sample allows us to probe the total decay width of the \chi_{b0}(1P). In the absence of a statistically significant result, a 90% confidence-level upper limit is set on the width at \Gamma_{total}< 2.4 MeV. Our results are based on 24.7 fb^{-1} of e+e- collision data recorded by the Belle detector at the \Upsilon(2S) resonance, corresponding to (157.8\pm3.6)\times10^6 \Upsilon(2S) decays.
    Full-text available · Article · Jun 2016
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    [Show abstract] [Hide abstract] ABSTRACT: The pseudorapidity density of charged particles, dN_{ch}/dη, at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02 TeV. For the 5% most central collisions, we measure a value of 1943±54. The rise in dN_{ch}/dη as a function of sqrt[s_{NN}] is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of dN_{ch}/dη as a function of the average number of participant nucleons, ⟨N_{part}⟩, calculated in a Glauber model, is compared with the previous measurement at sqrt[s_{NN}]=2.76 TeV. A constant factor of about 1.2 describes the increase in dN_{ch}/dη from sqrt[s_{NN}]=2.76 to 5.02 TeV for all centrality classes, within the measured range of 0%-80% centrality. The results are also compared to models based on different mechanisms for particle production in nuclear collisions.
    Full-text available · Article · Jun 2016 · Physical Review Letters
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    [Show abstract] [Hide abstract] ABSTRACT: We report on the first measurement of an excess in the yield of J/ψ at very low transverse momentum (p_{T}<0.3 GeV/c) in peripheral hadronic Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV, performed by ALICE at the CERN LHC. Remarkably, the measured nuclear modification factor of J/ψ in the rapidity range 2.5<y<4 reaches about 7 (2) in the p_{T} range 0-0.3 GeV/c in the 70%-90% (50%-70%) centrality class. The J/ψ production cross section associated with the observed excess is obtained under the hypothesis that coherent photoproduction of J/ψ is the underlying physics mechanism. If confirmed, the observation of J/ψ coherent photoproduction in Pb-Pb collisions at impact parameters smaller than twice the nuclear radius opens new theoretical and experimental challenges and opportunities. In particular, coherent photoproduction accompanying hadronic collisions may provide insight into the dynamics of photoproduction and nuclear reactions, as well as become a novel probe of the quark-gluon plasma.
    Full-text available · Article · Jun 2016 · Physical Review Letters
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    [Show abstract] [Hide abstract] ABSTRACT: The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < ycms< −2.96 and 2.03 < ycms< 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σψ(2S) is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σψ(2S)/σJ/ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.
    Full-text available · Article · Jun 2016 · Journal of High Energy Physics
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    J. S. Hwang · Y. J. Yoo · J. -H. Kang · [...] · Y. P. Lee
    [Show abstract] [Hide abstract] ABSTRACT: Multiferroic materials attract considerable interest because of the wide range of potential applications such as spintronic devices, data storage and sensors. As a strong candidate for the applications among the limited list of single-phase multiferroic materials, BiFeO3 (BFO) is a quite attractive material due to its multiferroic properties at room temperature (RT). However, BFO is widely known to have large leakage current and small spontaneous polarization due to the existence of crystalline defects such as oxygen vacancies. Furthermore, the magnetic moment of pure BFO is very weak owing to its antiferromagnetic nature. In this paper, the effects of Ni2+ substitution on the magnetic properties of bulk BFO have been investigated. BFO, and BiFe0.99Ni0.01O3, BiFe0.98Ni0.02O3 and BiFe0.97Ni0.03O3 (BFNO: Ni-doped BFO) ceramics were prepared by solid-state reaction and rapid sintering, and analyzed by structural and magnetic-property measurements. The leakage current density was measured at RT by using a standard ferroelectric tester. All the Ni-doped BFO exhibit the similar rhombohedral perovskite structure (R3c) to that of BFO. The magnetic properties of Ni-doped BFO are much enhanced with respect to BFO prepared at the same conditions, since the enhanced ferromagnetic interaction is caused by the Fe/Ni coupling.
    Full-text available · Article · May 2016 · Journal- Korean Physical Society
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    [Show abstract] [Hide abstract] ABSTRACT: Three- and four-pion Bose-Einstein correlations are presented in pp,p-Pb, and Pb-Pb collisions at the LHC. We compare our measured four-pion correlations to the expectation derived from two- and three-pion measurements. Such a comparison provides a method to search for coherent pion emission. We also present mixed-charge correlations in order to demonstrate the effectiveness of several analysis procedures such as Coulomb corrections. Same-charge four-pion correlations in pp and p-Pb appear consistent with the expectations from three-pion measurements. However, the presence of non-negligible background correlations in both systems prevent a conclusive statement. In Pb-Pb collisions, we observe a significant suppression of three- and four-pion Bose-Einstein correlations compared to expectations from two-pion measurements. There appears to be no centrality dependence of the suppression within the 0%-50% centrality interval. The origin of the suppression is not clear. However, by postulating either coherent pion emission or large multibody Coulomb effects, the suppression may be explained.
    Full-text available · Article · May 2016
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    [Show abstract] [Hide abstract] ABSTRACT: The multi-strange baryon yields in Pb–Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, , in p–Pb collisions at a centre-of-mass energy of = 5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c < < 7.2 GeV/c and 0.8 GeV/c < < 5 GeV/c, for Ξ and Ω respectively, in the common rapidity interval -0.5 0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The spectra are analysed as a function of event charged–particle multiplicity, which in p–Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pb–Pb collisions. The measured distributions are compared to the expectations from a Blast-Wave model. The parameters which describe the production of lighter hadron species also describe the hyperon spectra in high multiplicity p–Pb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pb–Pb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in p–Pb data, the values of which range from those measured in minimum bias pp to the ones in Pb–Pb collisions. A statistical model qualitatively describes this multiplicity dependence using a canonical suppression mechanism, in which the small volume causes a relative reduction of hadron production dependent on the strangeness content of the hyperon.
    Full-text available · Article · May 2016 · Physics Letters B
  • [Show abstract] [Hide abstract] ABSTRACT: The production of J/psi and psi (2S) was studied with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5 < y < 4) down to zero transverse momentum (p(T)) in the dimuon decay channel. Inclusive J/psi yields were extracted in different centrality classes and the centrality dependence of the average p(T) is presented. The J/psi suppression, quantified with the nuclear modification factor (R-AA), was measured as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/psi production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the psi(2S) suppression are provided via the ratio of psi(2S) over J/psi measured in pp and Pb-Pb collisions.
    Article · May 2016 · Journal of High Energy Physics

Publication Stats

10k Citations


  • 2007-2014
    • Kookmin University
      • Department of Nano and Electronic Physics
      Sŏul, Seoul, South Korea
    • Institute of High Energy Physics
      Protvino, Moskovskaya, Russia
    • Charles University in Prague
      Praha, Praha, Czech Republic
    • Fu Jen Catholic University
      • Department of Physics
      Taipei, Taipei, Taiwan
    • Institute of Nuclear Physics
      Cracovia, Lesser Poland Voivodeship, Poland
  • 2012-2013
    • Lawrence Livermore National Laboratory
      • Physics Division
      Livermore, California, United States
    • Novosibirsk State University
      Novo-Nikolaevsk, Novosibirsk, Russia
  • 2007-2013
    • University of Colorado at Boulder
      Boulder, Colorado, United States
  • 2009-2012
    • University of Seoul
      Sŏul, Seoul, South Korea
  • 2007-2012
    • Joint Institute for Nuclear Research
      • Bogoliubov Laboratory of Theoretical Physics
      Dubno, Moskovskaya, Russia
  • 2003-2012
    • Seoul National University
      • Department of Physics and Astronomy
      Sŏul, Seoul, South Korea
    • Abilene Christian University
      New York City, New York, United States
  • 2002-2012
    • National Taiwan University
      • Department of Physics
      Taipei, Taipei, Taiwan
    • Columbia University
      New York, New York, United States
    • Hallym University
      • Department of Life Science
      Sŏul, Seoul, South Korea
    • Gyeongsang National University
      Shinshū, South Gyeongsang, South Korea
    • Tohoku Gakuin University
    • University of Tsukuba
      Tsukuba, Ibaraki, Japan
  • 2011
    • Nara Women's University
      Nara, Nara, Japan
    • Panjab University
      Chandigarh, Chandīgarh, India
    • Tohoku University
      • Research Center for Electron Photon Science
      Sendai, Kagoshima-ken, Japan
  • 2005-2010
    • University of Cincinnati
      • Department of Physics
      Cincinnati, Ohio, United States
    • École Polytechnique Fédérale de Lausanne
      Lausanne, Vaud, Switzerland
    • Peking University
      • School of Electronics Engineering and Computer Science
      Peping, Beijing, China
    • Yeungnam University
      경산시, Gyeongsangbuk-do, South Korea
  • 2001-2010
    • Yonsei University
      • Department of Biotechnology
      Sŏul, Seoul, South Korea
    • Chuo University
      Edo, Tōkyō, Japan
  • 2008
    • Justus-Liebig-Universität Gießen
      Gieben, Hesse, Germany
    • The Graduate University for Advanced Studies
      Миура, Kanagawa, Japan
  • 2004-2008
    • Institut für Hochenergiephysik Wien
      Wien, Vienna, Austria
    • Institute for Theoretical and Experimental Physics
      Moskva, Moscow, Russia
    • Victoria University Melbourne
      Melbourne, Victoria, Australia
    • NCI-Frederick
      Фредерик, Maryland, United States
  • 2002-2008
    • Budker Institute of Nuclear Physics
      Novo-Nikolaevsk, Novosibirsk, Russia
  • 2005-2007
    • Jožef Stefan Institute
      Lubliano, Ljubljana, Slovenia
    • Hefei University of Technology
      Luchow, Anhui Sheng, China
  • 2003-2007
    • Brookhaven National Laboratory
      • Physics Department
      New York City, NY, United States
  • 2006
    • Sungkyunkwan University
      Sŏul, Seoul, South Korea
    • Tata Institute of Fundamental Research
      • Department of Biological Sciences
      Mumbai, Mahārāshtra, India
    • Virginia Polytechnic Institute and State University
      • Department of Chemical Engineering
      Blacksburg, Virginia, United States
  • 2005-2006
    • Cheongju University
      • Department of Genetic Engineering
      Sŏul, Seoul, South Korea
  • 2004-2006
    • Nagoya University
      • Graduate School of Science
      Nagoya-shi, Aichi-ken, Japan
  • 2003-2005
    • University of Nantes
      Naoned, Pays de la Loire, France
    • Kyungpook National University
      Daikyū, Daegu, South Korea
  • 2002-2003
    • University of Lausanne
      Lausanne, Vaud, Switzerland
  • 2001-2003
    • Aomori University
      Aomori, Aomori Prefecture, Japan
  • 2001-2002
    • Vanderbilt University
      • Department of Mechanical Engineering
      Nashville, Michigan, United States
  • 1999
    • Korea Institute of Science and Technology
      Sŏul, Seoul, South Korea
  • 1998
    • Massachusetts Institute of Technology
      • Laboratory for Nuclear Science
      Cambridge, Massachusetts, United States