Sung Hyun Kim

World Institute of Kimchi, Kum, Jeollabuk-do, South Korea

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Publications (250)620.9 Total impact

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    ABSTRACT: Our previous studies demonstrated that transplantation of human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) into the hippocampus of a transgenic mouse model of Alzheimer's disease (AD) reduced amyloid-β (Aβ) plaques and enhanced cognitive function through paracrine action. Due to the limited lifespan of hUCB-MSCs after their transplantation, the extension of hUCB-MSC efficacy was essential for AD treatment. Here, we show that repeated cisterna magna injections of hUCB-MSCs activated endogenous hippocampal neurogenesis and significantly reduced Aβ42 levels. In order to identify the paracrine factors released from the hUCB-MSCs that stimulated endogenous hippocampal neurogenesis in the dentate gyrus, we co-cultured adult mouse neural stem cells (NSCs) with hUCB-MSCs and analyzed the co-cultured media with cytokine arrays. Growth/differentiation factor-15 (GDF-15) levels were significantly increased in the media. GDF-15 suppression in hUCB-MSCs with GDF-15-small interfering RNA reduced the proliferation of NSCs in co-cultures. Conversely, recombinant GDF-15 treatment in both in vitro and in vivo enhanced hippocampal NSC proliferation and neuronal differentiation. Repeated administration of hUBC-MSCs markedly promoted the expression of synaptic vesicle markers, including synaptophysin, which are downregulated in patients with AD. In addtition, in vitro synaptic activity through GDF-15 was promoted. Taken together, these results indicated that repeated cisterna magna administration of hUCB-MSCs enhanced endogenous adult hippocampal neurogenesis and synaptic activity through a paracrine factor of GDF-15, suggesting a possible role of hUCB-MSCs in future treatment strategies for AD.
    Stem cells and development 07/2015; DOI:10.1089/scd.2014.0487 · 4.20 Impact Factor
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    ABSTRACT: We studied the effect of direct charge trapping at different doping concentrations on the device performance in tris(8-hydroxyquinoline) aluminum (Alq3):10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H, 5H, 11H-(1)-benzopyropyrano(6,7-8-i,j)quinolizin-11-one (C545T) as a host-dopant system of a fluorescent organic light-emitting diode. With increasing C545T doping concentration, trap sites could lead to the promotion of hole injection and the suppression of electron injection due to the electron-transport-character of Alq3 host for each carriers, as confirmed by hole- and electron-only devices. Direct charge injection of hole carriers from the hole transport layer into C545T dopants and the charge trapping of electron carriers are the dominant process to improve the charge balance and the corresponding efficiency. The shift of the electroluminescence (EL) spectra from 519 nm to 530 nm was confirmed the exciton formation route from Förster energy transfer of host-dopant system to direct charge trapping of dopant only emitting system. Variation in the doping concentration plays how the dopant roles in the fluorescent host-dopant system. Even though concentration quenching in fluorescent dopants is unavoidable, relatively heavy doping is necessary to improve the charge balance and efficiency and to investigate the relationship between direct charge trapping and device performance. Heavy doping at 6% doping ratio also generates heavy exciton quenching and excimer exciton because of close enough among excitons and dipole-dipole interaction. The optimum device performance was achieved with a 4% doped device, retaining the high efficiency of 12.5 cd/A from 100 cd/m2 up to 15,000 cd/m2.
    ACS Applied Materials & Interfaces 07/2015; DOI:10.1021/acsami.5b04519 · 6.72 Impact Factor
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    ABSTRACT: The effect of varying degrees of surface and vertical coverage of gold nanoparticles (Au-NPs) by poly(styrenesulfonate)-doped poly (3,4-ethylenedioxythiophene) (PEDOT:PSS), which was used as a capping layer between indium tin oxide (ITO) and a hole transport layer (HTL) on small-molecule fluorescent organic light-emitting diodes (OLEDs), was systemically investigated. With respect to the Au-NP loading amount and size, the resultant current densities influenced the charge balance, and, therefore, the OLED device performance. When the capping layer consisted of ITO/Au-NPs/PEDOT:PSS+Au-NPs, superior device performance was obtained with 10-nm Au-NPs through increased surface coverage in comparison to other Au-NP PEDOT:PSS coverage conditions. Furthermore, the Au-NP size determined the vertical coverage of the capping layer. The current densities of OLEDs containing small Au-NPs (less than 30 nm, small vertical coverage) covered by PEDOT:PSS decreased because of the suppression of the hole carriers by the Au-NP trapping sites. However, the current densities of the devices with large Au-NPs (over 30 nm, large vertical coverage) increased. The increased electromagnetic fields observed around relatively large Au-NPs under electrical bias were attributed to increased current densities in the OLEDs, as confirmed by the finite-difference time-domain simulation. These results show that the coverage conditions of the Au-NPs by the PEDOT:PSS clearly influenced the OLED current density and efficiency.
    ACS Applied Materials & Interfaces 06/2015; DOI:10.1021/acsami.5b04248 · 6.72 Impact Factor
  • Sung Hyun Kim
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    ABSTRACT: This paper focuses on deriving an improved stability criterion for discrete time-delay systems via a Lyapunov–Krasovskii functional approach that takes advantage of triple summation terms. To this end, novel convex combination coefficients coupled with second-order time-varying delay terms are introduced, and the corresponding reciprocally convex approach is established with the use of the minimal number of slack matrix variables. Finally, three numerical examples are provided to illustrate the effectiveness of the proposed method, with particular regard to robustness and performance.
    Applied Mathematics and Computation 06/2015; 261. DOI:10.1016/j.amc.2015.03.086 · 1.60 Impact Factor
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    ABSTRACT: Purpose To investigate the clinical and demographic features of idiopathic macular telangiectasia (MacTel) in Korean patients since the introduction of spectral domain optical coherence tomography (SD-OCT). Methods We reviewed medical records of patients who were diagnosed with MacTel from 2009 to 2013. All patients underwent fluorescein angiography and SD-OCT and were classified as type 1 or type 2 according to the classification system proposed by Yannuzzi. Results Over a period of 5 years, 4 (18.2%) patients were diagnosed with type 1 MacTel and 18 (81.8%) patients were diagnosed with type 2 MacTel. All patients with type1 MacTel were male, and their mean age was 51 ± 8.6 years. Among patients with type 2 MacTel, 3 (16.7%) were male, 15 (83.3%) were female, and the mean age was 60 ± 13.6 years. Whereas all type 1 MacTel patients had either metamorphopsia or mild scotoma, of the 18 patients with type 2 MacTel, only 4 (22.2%) had those symptoms, 10 (55.6%) complained of only mild visual impairment, and the other 4 (22.2%) had no symptoms. Intraretinal cystoid spaces were observed in 26 (72.2%) of 36 eyes with type 2 MacTel by SD-OCT. These cystoid spaces had irregular boundaries and did not correspond to angiographic leakages. Conclusions Type 2 MacTel was most common in the present study. The wider availability of SD-OCT may have contributed to the diagnosis of type 2 MacTel. Type 2 MacTel may be more prevalent than type 1 in Koreans, which corresponds to the results of Western countries.
    Korean Journal of Ophthalmology 05/2015; 29(3):155-159. DOI:10.3341/kjo.2015.29.3.155
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    ABSTRACT: This study proposes to determine the correlation between the Volume Pulse Height (VPH) measured by nuclear emulsion and Linear Energy Transfer (LET) calculated by Monte Carlo simulation based on Geant4. The nuclear emulsion was irradiated at the National Cancer Center (NCC) with a therapeutic proton beam and was installed at 5.2 m distance from the beam nozzle structure with various thicknesses of water-equivalent material (PMMA) blocks to position with specific positions along the Bragg curve. After the beam exposure and development of the emulsion films, the films were scanned by S-UTS developed in Nagoya University. The proton tracks in the scanned films were reconstructed using the ‘NETSCAN’ method. Through this procedure, the VPH can be derived from each reconstructed proton track at each position along the Bragg curve. The VPH value indicates the magnitude of energy loss in proton track. By comparison with the simulation results obtained using Geant4, we found the correlation between the LET calculated by Monte Carlo simulation and the VPH measured by the nuclear emulsion.
    Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 04/2015; 349. DOI:10.1016/j.nimb.2014.12.083 · 1.12 Impact Factor
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    ABSTRACT: Ceramic filters are quite an efficient component for hot gas filtration due to their high collection efficiency and high thermal durability. Among the various steps to fabricate a ceramic filter, sintering is one of the most important processes. In this study, disk-type ceramic filters were prepared at various sintering temperatures, and the effect of sintering temperature on physical/chemical properties and filtration performance were investigated.
    Ceramics International 04/2015; 41(8). DOI:10.1016/j.ceramint.2015.04.090 · 2.09 Impact Factor
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    ABSTRACT: Anabaena sensory rhodopsin transducer (ASRT) is believed to be a major player in the photo-signal transduction cascade, which is triggered by Anabaena sensory rhodopsin. Here, we characterized DNA binding activity of ASRT probed by using fluorescence correlation spectroscopy. We observed clear decrease of diffusion coefficient of DNA upon binding of ASRT. The dissociation constant, KD, of ASRT to 20 bp-long DNA fragments lied in micro-molar range and varied moderately with DNA sequence. Our results suggest that ASRT may interact with several different regions of DNA with different binding affinity for global regulation of several genes that need to be activated depending on the light illumination.
    Bioscience Biotechnology and Biochemistry 03/2015; DOI:10.1080/09168451.2015.1015950 · 1.21 Impact Factor
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    ABSTRACT: Ca-promoted Ni/MgAl2O4 catalysts prepared by co-impregnation method with different Ca/Ni ratios of 0.0-1.0 were applied to syngas production for direct reduced iron via the combined H2O and CO2 reforming (CSCR) of coke oven gas (COG). The physicochemical properties of prepared catalysts were characterized by XRD, BET, H2-chemisorption, TPR and CO2-TPD. The SEM, TGA and TEM analysis was carried out to observe the coke deposition and agglomeration of Ni particle in used catalysts. It was confirmed that Ca addition improved the Ni dispersion, strong metal-support interaction (SMSI) and CO2 adsorption of catalyst. The CSCR of COG was carried out under the reaction conditions of CH4:H2O:CO2:H2:CO:N2 = 1:1.2:0.4:2:0.3:0.3, 700-900 °C, 5 atm. The Ca-promoted 10Ni/MgAl2O4 catalysts show higher CH4 conversion and coke resistance than 10Ni/MgAl2O4 catalyst without Ca addition. In particular, 10Ni-5Ca/MgAl2O4 catalyst with Ca/Ni ratio of 0.5 showed a good catalytic activity and sinter-stability in CSCR of COG at high temperature of 900 °C due to high Ni dispersion and improved SMSI.
    Fuel 03/2015; 153. DOI:10.1016/j.fuel.2015.03.007 · 3.41 Impact Factor
  • Kangmin Chon, Sung Hyun Kim, Jaeweon Cho
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    ABSTRACT: This study investigated the removal efficiency and mechanisms of water contaminants (mainly N-nitrosamines) during municipal wastewater reclamation by a membrane bioreactor (MBR) and nanofiltration (NF) hybrid system. The removal of bulk water contaminants was governed by the microbial activities in the MBR and molecular weight cut-off (MWCO) of the NF membranes. The removal of N-nitrosamines by the MBR was primarily attributed to biodegradation by aerobic bacteria, which can be determined by the reactivity of the amine functional groups with the catabolic enzymes (removal efficiency=45-84%). Adsorption and formation of membrane fouling can enhance the removal of N-nitrosamines by the NF membranes. However, size-exclusion is found to play a major role in the removal of N-nitrosamines by the NF membranes since the removal efficiencies of N-nitrosamines varied significantly depending on molecular weight of the N-nitrosamines and MWCO of the NF membranes (removal efficiency: NE90>NE70). Copyright © 2015 Elsevier Ltd. All rights reserved.
    Bioresource Technology 02/2015; 190. DOI:10.1016/j.biortech.2015.02.080 · 5.04 Impact Factor
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    ABSTRACT: Accumulating evidence suggests that changes in methylation patterns may help mediate the sensitivity or resistance of cancer cells to ionizing radiation. The present study provides evidence for the involvement of radioresistance-induced DNA methylation changes in tumor radioresistance. We established radioresistant laryngeal cancer cells via long-term fractionated irradiation, and examined differences in DNA methylation between control and radioresistant laryngeal cancer cells. Interestingly, we found that the promoter-CpG islands of five previously identified radioresistance-related genes (TOPO2A, PLXDC2, ETNK2, GFI1, and IL12B) were significantly altered in the radioresistant laryngeal cancer cells. Furthermore, the demethylation of these gene promoters with a DNA methyltransferase inhibitor (5-aza-2'-deoxycytidine) increased their transcription levels. Treatment with 5-aza-2'-deoxycytidine also sensitized the radioresistant laryngeal cancer cells to irradiation, indicating that changes in DNA methylation contributed to their radioresistance. Of the tested genes, the expression and activity levels of TOPO2A were tightly associated with the radioresistant phenotype in our system, suggesting that the hypermethylation of TOPO2A might be involved in this radioresistance. Collectively, our data suggest that radiation-induced epigenetic changes can modulate the radioresistance of laryngeal cancer cells, and thus may prove useful as prognostic indicators for radiotherapy.
    Cancer biology & therapy 02/2015; 16(4). DOI:10.1080/15384047.2015.1017154 · 3.63 Impact Factor
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    ABSTRACT: RecA proteins form a long stable filament on a single-stranded DNA and catalyze strand exchange reaction. The stability of RecA filament changes dramatically with pH, yet its detailed mechanism is not known. Here, using a single molecule assay, we determined the binding and dissociation rates of RecA monomers at the filament ends at various pH. The pH-induced rate changes were moderate but occurred in opposite directions for binding and dissociation, resulting in a substantial increase in filament stability in lower pH. The highly charged residues in C-terminal domain do not contribute to the pH dependent stability. The stability enhancement of RecA filament in low pH may help the cell to cope with acidic stress by fine-tuning of the binding and dissociation rates without losing the highly dynamic nature of the filament required for strand exchange.
    PLoS ONE 01/2015; 10(1):e0115611. DOI:10.1371/journal.pone.0115611 · 3.53 Impact Factor
  • Sung Hyun Kim, Choul Yong Park
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    ABSTRACT: To compare neodymium-doped yttrium aluminum garnet (Nd:YAG) laser capsulotomy rates between 2 different aspheric intraocular lenses, SN60WF and MI-60, in patients who underwent cataract surgery.
    Journal of the Korean Ophthalmological Society 01/2015; 56(2):190. DOI:10.3341/jkos.2015.56.2.190
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    ABSTRACT: A growing body of evidence indicates that zoledronic acid (ZA) can improve the clinical outcome in patients with breast cancer and low estrogen levels. In the present study, we aimed to investigate the survival benefit of ZA administration in postmenopausal Korean women with breast cancer who were also receiving aromatase inhibitors. Between January 2004 and December 2010, 235 postmenopausal breast cancer patients undergoing aromatase inhibitor therapy were investigated. All patients were postmenopausal, as confirmed by laboratory tests. Of these patients, 77 received adjuvant upfront ZA for at least 1 year in addition to conventional adjuvant treatment. The remaining 158 patients never received ZA and were treated according to the St. Gallen guidelines. The baseline characteristics for ZA treatment were not different between the two groups. The median follow-up time was 62 months, and the patients who received ZA in addition to aromatase inhibitors showed a better recurrence-free survival compared to those who received aromatase inhibitors alone (p=0.035). On multivariate analysis, the patients who received ZA showed a better recurrence-free survival independent of the tumor size, nodal status, progesterone receptor, and histological grade. For this model, Harrell c index was 0.743. The hazard ratio of ZA use for recurrence-free survival was 0.12 (95% confidence interval, 0.01-0.99). Our findings suggest that upfront use of ZA as part of adjuvant treatment can offer a survival benefit to postmenopausal breast cancer patients receiving aromatase inhibitor treatment.
    Journal of Breast Cancer 12/2014; 17(4):350-5. DOI:10.4048/jbc.2014.17.4.350 · 1.32 Impact Factor
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    ABSTRACT: To date, several regulatory proteins involved in mitochondrial dynamics have been identified. However, the precise mechanism coordinating these complex processes remains unclear. Mitochondrial chaperones regulate mitochondrial function and structure. Chaperonin 10 (Cpn10) interacts with heat shock protein 60 (HSP60) and functions as a co-chaperone. In this study, we found that down-regulation of Cpn10 highly promoted mitochondrial fragmentation in SK-N-MC and SH-SY5Y neuroblastoma cells. Both genetic and chemical inhibition of Drp1 suppressed the mitochondrial fragmentation induced by Cpn10 reduction. Reactive oxygen species (ROS) generation in 3-NP-treated cells was markedly enhanced by Cpn10 knock down. Depletion of Cpn10 synergistically increased cell death in response to 3-NP treatment. Furthermore, inhibition of Drp1 recovered Cpn10-mediated mitochondrial dysfunction in 3-NP-treated cells. Moreover, an ROS scavenger suppressed cell death mediated by Cpn10 knockdown in 3-NP-treated cells. Taken together, these results showed that down-regulation of Cpn10 increased mitochondrial fragmentation and potentiated 3-NP-mediated mitochondrial dysfunction in neuroblastoma cells.
    PLoS ONE 11/2014; 9(11):e112130. DOI:10.1371/journal.pone.0112130 · 3.53 Impact Factor
  • Sung Hyun Kim
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    ABSTRACT: This paper investigates the problem of stochastic stability analysis for a class of discrete-time singular Markovian jump systems with time-varying delays and incomplete (i.e., unknown and uncertain) transition probabilities. To derive an improved delay-range-dependent stability criterion under the incomplete transition descriptions, a relaxation scheme is proposed with consideration of the free-weighting matrix method compatible with the delay partitioning technique, and its purpose is accomplished (1) by making full use of the available boundary information on incomplete transition probabilities, and (2) by employing novel slack variables that allow some useful equality constraints to be exploited.
    Journal of the Franklin Institute 10/2014; 352(1). DOI:10.1016/j.jfranklin.2014.10.012 · 2.26 Impact Factor
  • Sung Hyun Kim
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    ABSTRACT: The attention of this paper is focused on deriving less conservative stabilization conditions for Markovian jump fuzzy systems by introducing a relaxation scheme for incomplete transition probability descriptions. To this end, this paper proposes a representation approach that can express the considered conditions in terms of homogeneous polynomial of unknown and uncertain transition rates. Furthermore, based on this approach, this paper incorporates all possible slack variables into the relaxation process with consideration of the property of transition rates. Finally, three numerical examples are given to show the effectiveness of the derived stabilization conditions.
    Nonlinear Dynamics 10/2014; 78(1):691-701. DOI:10.1007/s11071-014-1469-z · 2.42 Impact Factor
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    ABSTRACT: The silicon carbide (SiC) ceramic filter is the most favorable component to remove particulate matter from hot flue gas due to its high filtration efficiency and high thermal durability. The effect of SiC powder size on the physical properties and filtration performance to prepare high-performance granular ceramic filter media was investigated in this study. Disk-type filter media were prepared by mixing ceramic components followed by physical compression and sintering. The porosity and average pore diameter in the filter media increased with increasing powder size. However, the mechanical strength decreased with increasing powder size, while it increased with increasing physical compressive force. The filter performance factor, qFM was introduced to evaluate the ceramic filter properties, and the SiC50 filter was the best of the ceramic filters prepared in this study. We also found that diffusion was a dominant collection mechanism for particles smaller than 0.7 μm, and direct interception and inertia were dominant collection mechanisms for particles larger than 0.7 μm in the SiC50 filter based on a single collector efficiency model. In addition, the predicted collection efficiencies showed reasonably good agreement with the experimental ones.Copyright 2014 American Association for Aerosol Research
    Aerosol Science and Technology 10/2014; 48(10). DOI:10.1080/02786826.2014.957755 · 3.16 Impact Factor
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    ABSTRACT: The active, stretched conformation of the RecA filament bound to single stranded DNA is required for homologous recombination. During this process, the RecA filament mediates homology search and base pair exchange with a complementary sequence. Subsequently, the RecA filament dissociates from DNA upon reaction completion. ATP binding and hydrolysis is critical throughout these processes. Little is known about the time scale, order of conversion between different co-factor bound forms during ATP hydrolysis and the associated changes in filament conformation. We used single-molecule fluorescence techniques to investigate how ATP hydrolysis is coupled with filament dynamics. For the first time, we observed real-time cooperative structural changes within the RecA filament. This cooperativity between neighboring monomers provides a time window for nucleotide cofactor exchange, which keeps the filament in the active conformation amidst continuous cycles of ATP hydrolysis.
    Journal of the American Chemical Society 09/2014; 136(42). DOI:10.1021/ja506363y · 11.44 Impact Factor
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    ABSTRACT: A highly dispersed 50 wt% Ni/MgO–Al2O3 catalyst was prepared by deposition–precipitation (DP) method for the diesel pre-reforming reaction. The pH of the precursor solution was controlled from pH 9.5 to 12.0 to examine the effects on NiO crystallite size and metal dispersion. The increase of pH of the precursor solution causes an increase of specific surface area and metal dispersion, and reduces NiO crystallite size. The pre-reforming reaction was carried out using n-tetradecane as surrogate compound of diesel. The coke formation of used catalysts was examined by TGA, TEM, SEM, and Raman analysis. The 50 wt% Ni/MgO–Al2O3 catalyst prepared at pH 11.5 showed a high catalytic activity and excellent coke resistance due to high metal dispersion (8.71%), small NiO crystallite size (3.5 nm), and strong interaction between Ni and support. Furthermore, this catalyst showed a good stability in the pre-reforming reaction at S/C ratio of 3.5 and 450 °C for 88 h.
    International Journal of Hydrogen Energy 07/2014; 39(21):10941–10950. DOI:10.1016/j.ijhydene.2014.05.041 · 2.93 Impact Factor

Publication Stats

3k Citations
620.90 Total Impact Points

Institutions

  • 2015
    • World Institute of Kimchi
      Kum, Jeollabuk-do, South Korea
    • Institute for Basic Science
      Daiden, Daejeon, South Korea
  • 2007–2015
    • Sogang University
      • Department of Physics
      Sŏul, Seoul, South Korea
    • Dankook University
      • Department of Polymer Science and Engineering
      Eidō, Chungcheongbuk-do, South Korea
    • Catholic University of Korea
      • Department of Family Medicine
      Sŏul, Seoul, South Korea
  • 2000–2015
    • Korea University
      • Department of Chemical and Biological Engineering
      Sŏul, Seoul, South Korea
  • 2012–2014
    • University of Ulsan
      • Department of Electrical Engineering
      Urusan, Ulsan, South Korea
    • Jeju National University
      Tse-tsiu, Jeju, South Korea
  • 2011–2014
    • Kyung Hee University
      • • Department of Medicine
      • • Department of Advanced Materials Engineering for Information & Electronics
      Sŏul, Seoul, South Korea
    • Chung-Ang University
      • College of Pharmacy
      Sŏul, Seoul, South Korea
    • Samsung Electro-Mechanics
      Sŏul, Seoul, South Korea
    • Korea Electronics Technology Institute
      • Energy Nano Materials Research Center
      Sŏngnam, Gyeonggi Province, South Korea
  • 2008–2014
    • Yonsei University Hospital
      • • Surgery
      • • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • Hanyang University Medical Center
      Sŏul, Seoul, South Korea
  • 2006–2014
    • Seoul National University
      • • Department of Chemistry
      • • Department of Chemical and Biological Engineering
      Sŏul, Seoul, South Korea
    • Kyungpook National University
      • • Department of Physics
      • • School of Food Science and Biotechnology
      • • College of Natural Sciences
      Daikyū, Daegu, South Korea
    • University of Incheon
      • School of Mechanical System Engineering
      Sŏul, Seoul, South Korea
  • 2013
    • Dongguk University
      Sŏul, Seoul, South Korea
    • Pusan National University
      Tsau-liang-hai, Busan, South Korea
  • 2012–2013
    • Chosun University
      • • Department of Biology
      • • Department of Advanced Materials Engineering
      Gwangju, Gwangju, South Korea
  • 2009–2013
    • Weill Cornell Medical College
      • Department of Biochemistry
      New York, New York, United States
    • Texas A&M University
      College Station, Texas, United States
  • 2004–2013
    • Ewha Womans University
      • Department of Economics
      Sŏul, Seoul, South Korea
  • 2011–2012
    • Inha University
      Chemulpo, Incheon, South Korea
  • 2009–2012
    • Dong-A University
      • College of Medicine
      Tsau-liang-hai, Busan, South Korea
  • 2006–2011
    • Pohang University of Science and Technology
      • • Department of Electronic and Electrical Engineering
      • • Department of Electrical and Computer Engineering
      Geijitsu, Gyeongsangbuk-do, South Korea
  • 2006–2010
    • Seoul National University Bundang Hospital
      • Department of Radiology
      Sŏul, Seoul, South Korea
  • 2004–2009
    • Gwangju Institute of Science and Technology
      • Department of Life Sciences
      Gwangju, Gwangju, South Korea
  • 2003–2008
    • Korea Advanced Institute of Science and Technology
      • Department of Biological Sciences
      Sŏul, Seoul, South Korea
    • Korea Institute of Energy Research
      Sŏul, Seoul, South Korea
    • Catholic Sangji College
      Sŏul, Seoul, South Korea
  • 2005
    • Wonkwang University
      Riri, North Jeolla, South Korea
    • Bundang Jesaeng Hospital
      Sŏngnam, Gyeonggi Province, South Korea
  • 2001
    • Korea Information Society Development Institute
      Sŏngnam, Gyeonggi Province, South Korea