H S Kim

Gachon University, Sŏngnam, Gyeonggi-do, South Korea

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Publications (767)1645.08 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The dynamic strain aging (DSA) of metallic materials due to solute atom diffusion to mobile dislocations induce deformation instability with load fluctuations and deformation localizations, hence reducing their sheet formability. In this paper, DSA behaviors of twinning induced plasticity (TWIP) steel with and without Al during tensile testing and deep drawing are investigated in terms of strain localization and the Portevin-Le Chatelier (PLC) band. A theoretical DSA model with internal variables of dislocation density and twin volume fraction is presented for an estimation of strain localization and strain hardening behavior of TWIP steels. The simulation results of the load history and PLC bands during tensile testing and deep drawing are in good agreement with the experimental values. A serration behavior is observed in high-Mn TWIP steels and its tensile residual stress is higher than that in the Al-added TWIP steels, which results in a deformation crack or delayed fracture of deep drawn specimens.
    Materials Science and Engineering A 03/2015; 633. DOI:10.1016/j.msea.2015.03.008 · 2.41 Impact Factor
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    ABSTRACT: We evaluated the correlation between central bone mineral density (BMD) and peripheral bone attenuation using lower extremity computed tomography (CT). A good correlation was found between lower extremity CT and central BMD suggesting that CT is useful for screening osteoporosis, and that peripheral bone attenuation adequately reflects central BMD. This study aimed to evaluate the reliability and validity of CT as a screening tool for osteoporosis and to estimate the correlation between central BMD and peripheral bone attenuation using lower extremity CT. In total, 292 patients who underwent a lower extremity, lumbar spine, or abdomen and pelvic CT scan within a 3-month interval of a dual-energy X-ray absorptiometry (DEXA) examination were included. Following reliability testing, bone attenuation of the L1, L2, L3, L4, femoral head, femoral neck, greater trochanter, distal femur, proximal tibia, distal tibia, and talus was measured by placing a circular region of interest on the central part of each bony region on a coronal CT image. Partial correlation was used to assess the correlation between CT and DEXA after adjusting for age and body mass index. In terms of reliability, all bone attenuation measurements, except the femoral neck, showed good to excellent interobserver reliability (intraclass correlation coefficients, 0.691-0.941). In terms of validity, bone attenuation of the L1 to L4, femoral neck, and greater trochanter on CT showed significant correlations with BMD of each area on DEXA (correlation coefficients, 0.399-0.613). Bone attenuation of the distal tibia and talus on CT showed significant correlations with BMD of all parts on DEXA (correlation coefficients, 0.493-0.581 for distal tibia, 0.396-0.579 for talus). Lower extremity CT is a useful screening tool for osteoporosis, and peripheral bone attenuation on lower extremity CT adequately reflects central BMD on DEXA.
    Osteoporosis International 01/2015; 26(4). DOI:10.1007/s00198-014-3013-x · 4.17 Impact Factor
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    ABSTRACT: It is unclear whether treating brain metastasis before starting systemic chemotherapy can improve survival compared to upfront chemotherapy in non-small cell lung cancer (NSCLC) with asymptomatic cerebral oligo-metastases. We undertook a randomized controlled trial of 105 patients with one to four brain metastases, admitted to Samsung Medical Center between 2008 and 2013. Patients were randomly assigned to receive stereotactic radiosurgery (SRS) (49 patients) followed by chemotherapy or upfront chemotherapy (49 patients). The primary end point was overall survival and secondary end points included central nervous system (CNS) progression-free survival, progression to symptomatic brain metastasis, and brain functional outcome. The median age was 58 years (range, 29-85) with ECOG 0-1 performance status, and 40% of patients were never smokers. Most patients had adenocarcinoma, and about half of patients had only one brain metastasis while, the rest had multiple cerebral metastases. The median overall survival time was 14.6 months (95% CI, 9.2-20.0) in SRS group and 15.3 months (95% CI, 7.2-23.4) for upfront chemotherapy group (P=.418). There was no significant difference in time to CNS disease progression (median, 9.4 months (SRS) vs. 6.6 months (upfront chemotherapy), P=.248). Symptomatic progression of brain metastases was observed more frequently in upfront chemotherapy group (26.5%) than SRS group (18.4%) but without statistical significance. Although this study included smaller sample size than initially anticipated due to early termination, SRS followed by chemotherapy did not improve overall survival in oligo-brain metastases NSCLC patients compared with upfront chemotherapy. Further study with large number of patients should be needed to confirm the use of upfront chemotherapy alone in this subgroup of patients. © The Author 2014. Published by Oxford University Press on behalf of the European Society for Medical Oncology. All rights reserved. For permissions, please email: journals.permissions@oup.com.
    Annals of Oncology 12/2014; 26(4). DOI:10.1093/annonc/mdu584 · 6.58 Impact Factor
  • Fertility and Sterility 09/2014; 102(3):e317-e318. DOI:10.1016/j.fertnstert.2014.07.1076 · 4.30 Impact Factor
  • H. S. Kim, S. J. Noh
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    ABSTRACT: Plasma-facing components (PFCs) in fusion devices inherently suffer from irradiation by hydrogen isotope plasmas. Graphite is used as the first wall of the Korea Superconducting Tokamak Advanced Research (KSTAR) because of its low atomic number and excellent thermal and mechanical properties. In this experiment, the effect of hydrogen-plasma irradiation on the PFCs was studied using KSTAR-like graphite tiles. The tiles were irradiated with low-energy hydrogen plasmas produced by an electron cyclotron resonance system. The changes in the surface morphology and disorders induced in the structure were investigated using field-emission scanning electron microscopy, X-ray diffraction, Raman spectroscopy, and electron spin resonance measurements.
    Journal- Korean Physical Society 09/2014; 65(5):606-609. DOI:10.3938/jkps.65.606 · 0.43 Impact Factor
  • Fertility and Sterility 09/2014; 102(3):e66. DOI:10.1016/j.fertnstert.2014.07.225 · 4.30 Impact Factor
  • Fertility and Sterility 09/2014; 102(3):e324. DOI:10.1016/j.fertnstert.2014.07.1097 · 4.30 Impact Factor
  • Fertility and Sterility 09/2014; 102(3):e228. DOI:10.1016/j.fertnstert.2014.07.775 · 4.30 Impact Factor
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    ABSTRACT: In this study, a combination of silicon and carbon as the anode material for an all-solid-state battery has been investigated to overcome their individual deficiencies. The capacity of silicon thin films with an input power of 60 W shows dramatic failure after 38 cycles due to serious volume expansion. In contrast, C thin films at 60 W show high stability of cyclic performance and capacity retention. The amorphous silicon and carbon composite reduced the volume expansion of silicon during long term cycles and enhanced the low specific capacity of the carbon. This resistance of the volume expansion might be expected from the cushion effect caused by the carbon, which was confirmed by scanning electron microscope images after a 100 cycle test. These results indicate that amorphous silicon and carbon composite thin films have a high possibility as the stable anode material for an all-solid-state battery.
    Thin Solid Films 08/2014; 564. DOI:10.1016/j.tsf.2014.04.094 · 1.87 Impact Factor
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    ABSTRACT: Abstract This study examined the effects of a 6-week intermittent exercise training, at different intensities, on body composition, functional walking and aerobic endurance in overweight children. Forty-eight overweight children (age: 10.4 ± 0.9 years) were randomly assigned to either intervention or control group. Lower and higher intensity intermittent exercise groups (LIIE and HIIE) performed intermittent running three times a week. LIIE performed more intervals at a lower intensity [16 intervals at 100% of individual maximal aerobic speed (MAS), 8 minutes in total], and HIIE performed fewer intervals at a higher intensity (12 intervals at 120% of MAS, 6 minutes in total). Each interval consisted of a 15-second run at the required speed, followed by a 15-second passive recovery. After 6 weeks, HIIE had a significantly (p < 0.05) higher percentage reduction in sum of skinfolds (i.e. calf and triceps), and significantly (p < 0.05) fewer steps during the functional obstacle performance, as compared with LIIE and control group. Significant improvement (p < 0.05) was found in intermittent aerobic endurance for HIIE as compared to the control group. Higher intensity intermittent training is an effective and time-efficient intervention for improving body composition, functional walking and aerobic endurance in overweight children.
    European Journal of Sport Science 07/2014; 15(2):1-9. DOI:10.1080/17461391.2014.933880 · 1.31 Impact Factor
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    ABSTRACT: Superconducting tokamaks like KSTAR, EAST and ITER need elaborate magnetic controls mainly due to either the demanding experiment schedule or tighter hardware limitations caused by the superconducting coils. In order to reduce the operation runtime requirements, two types of plasma simulators for the KSTAR plasma control system (PCS) have been developed for improving axisymmetric magnetic controls. The first one is an open-loop type, which can reproduce the control done in an old shot by loading the corresponding diagnostics data and PCS setup. The other one, a closed-loop simulator based on a linear nonrigid plasma model, is designed to simulate dynamic responses of the plasma equilibrium and plasma current (Ip) due to changes of the axisymmetric poloidal field (PF) coil currents, poloidal beta, and internal inductance. The closed-loop simulator is the one that actually can test and enable alteration of the feedback control setup for the next shot. The simulators have been used routinely in 2012 plasma campaign, and the experimental performances of the axisymmetric shape control algorithm are enhanced. Quality of the real-time EFIT has been enhanced by utilizations of the open-loop type. Using the closed-loop type, the decoupling scheme of the plasma current control and axisymmetric shape controls are verified through both the simulations and experiments. By combining with the relay feedback tuning algorithm, the improved controls helped to maintain the shape suitable for longer H-mode (10–16 s) with the number of required commissioning shots largely reduced.
    Fusion Engineering and Design 05/2014; 89(5). DOI:10.1016/j.fusengdes.2013.12.040 · 1.15 Impact Factor
  • European Journal of Cancer 05/2014; 50:e67. DOI:10.1016/j.ejca.2014.03.252 · 4.82 Impact Factor
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    ABSTRACT: In this study, phantom was used to evaluate attenuation correction computed tomography (CT) dose and image in case of pediatric positron emission tomography (PET)/CT scan. Three PET/CT scanners were used along with acryl phantom in the size for infant and ion-chamber dosimeter. The CT image acquisition conditions were changed from 10 to 20, 40, 80, 100 and 160 mA and from 80 to 100, 120 and 140 kVp, which aimed at evaluating penetrate dose and computed tomography dose indexvolume (CTDIvol) value. And NEMA PET Phantom™ was used to obtain PET image under the same CT conditions in order to evaluate each attenuation-corrected PET image based on standard uptake value (SUV) value and signal-to-noise ratio (SNR). In general, the penetrate dose was reduced by around 92% under the minimum CT conditions (80 kVp and 10 mA) with the decrease in CTDIvol value by around 88%, compared with the pediatric abdomen CT conditions (100 kVp and 100 mA). The PET image with its attenuation corrected according to each CT condition showed no change in SUV value and no influence on the SNR. In conclusion, if the minimum dose CT that is properly applied to body of pediatric patient is corrected for attenuation to ensure that the effective dose is reduced by around 90% or more compared with that for adult patient, this will be useful to reduce radiation exposure level.
    Radiation Effects and Defects in Solids 04/2014; 169(4). DOI:10.1080/10420150.2013.848443 · 0.60 Impact Factor
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    ABSTRACT: InGaAs-capped InAs quantum dots (QDs) and InAs QDs were adopted for the study of the effects through growth temperature and the band structure of InAs QDs on the performance of GaAs-based QD solar cell. It has been shown that the defects due to low temperature growth resulted in the decrease of Voc, Jsc and external quantum efficiency for GaAs bulk solar cell and QD embedded solar cells. It has been also found that InAs QDs act as defects by trapping photo-generated carries which affect the carrier transport in QD solar cell. The QD solar cell with InGaAs-capped InAs QDs showed higher performance than the QD solar cell with only InAs QDs. Such result has been explained by photo-generated carrier trapping and tunneling through InGaAs QW state in InGaAs-capped InAs QDs.
    Journal of Nanoscience and Nanotechnology 04/2014; 14(4):2955-9. DOI:10.1166/jnn.2014.8639 · 1.34 Impact Factor
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    ABSTRACT: Earlier, we examined the positive effects of hyperoxic air on the cognitive ability of intellectually and developmentally disabled people (IDDP). In this study, the correlation between cognitive performance in the visual matching task and heart rate (HR) was investigated under normal air conditions. Eighteen men (mean age 28.7 ± 5.0 year) and 22 women (mean age 35.5 ± 6.9 year) with an assessed disability level of 2.3 ± 0.6 participated. The experiment consisted of three phases, a total of 7 min, including the rest (3 min), control (2 min), and visual matching task (2 min) phases. The HR in the visual matching task phase increased, compared to that in the rest and control phases. The cognitive ability in the visual matching task correlated with the HR values; the response time showed a negative correlation with the HR, while the accuracy rate showed a positive correlation. Thus, adaptive changes in cardiovascular regulation probably related to cognitive efforts and emotional excitation is a noticeable factor influencing brain supply with oxygen in IDDP (similarly to those in healthy people). The result of this study agrees with the earlier obtained indications that hyperoxic air can positively affect the cognitive performance in IDDP.
    Neurophysiology 04/2014; 46(2):169-172. DOI:10.1007/s11062-014-9423-8 · 0.17 Impact Factor
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    ABSTRACT: A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed in 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This scheme has many advantageous properties over previously studied focusing schemes, including being significantly shorter for a given energy and having a significantly better energy bandwidth. Experimental results from the ATF2 accelerator at KEK are presented that validate the operating principle of such a scheme by demonstrating the demagnification of a 1.3 GeV electron beam down to below 65 nm in height using an energy-scaled version of the compact focusing optics designed for the ILC collider.
    Physical Review Letters 01/2014; 112:034802. · 7.73 Impact Factor
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    ABSTRACT: A facile and rapid glycine-assisted combustion method was developed to synthesize polycrystalline La0.8Ca0.2MnO3 (LCMO) powder by dissolving lanthanum nitrate, calcium nitrate, manganese nitrate (oxidant) and glycine (fuel) as the starting materials and water as solvent and then heating the resulting solution on a heating plate. The X-ray diffraction and FTIR analyses confirmed the orthorhombic crystal structure, and a morphological study showed the polycrystalline form of the LCMO powder. The calculated lattice constants a = 5.46, b = 7.73, and c = 5.49 Å agreed well with the standard values. The magnetic measurements showed a paramagnetic behavior of LCMO at room temperature. The maximum change in entropy observed for the LCMO sample was −1.95 J/kgK at an applied magnetic field of 2 T at the Curie temperature of 165 K.
    Journal- Korean Physical Society 12/2013; 61(12). DOI:10.3938/jkps.61.2000 · 0.43 Impact Factor
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    ABSTRACT: Spherical Ti-6Al-4V powders in the size range of 250 and 300 were uniformly doped with nano-sized hydroxyapatite (HAp) powders by Spex milling process. A single pulse of 0.75-2.0 kJ/0.7 g of the Ti-6Al-4V powders doped with HAp from 300 mF capacitor was applied to produce fully porous and porous-surfaced Ti-6Al-4V implant compact by electro-discharge-sintering (EDS). The solid core was automatically formed in the center of the compact after discharge and porous layer consisted of particles connected in three dimensions by necks. The solid core increased with an increase in input energy. The compressive yield strength was in a range of 41 to 215 MPa and significantly depended on input energy. X-ray photoelectron spectroscopy and energy dispersive x-ray spectrometer were used to investigate the surface characteristics of the Ti-6Al-4V compact. Ti and O were the main constituents, with smaller amount of Ca and P. It was thus concluded that the porous-surfaced Ti-6Al-4V implant compacts doped with HAp can be efficiently produced by manipulating the milling and electro-discharge-sintering processes.
    10/2013; 20(5). DOI:10.4150/KPMI.2013.20.5.376
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    ABSTRACT: Plasma-facing components (PFCs) in fusion devices are exposed to an irradiation environment of high particle flux. Among various candidate materials for PFCs, graphite is used as a first-wall material of the Korea Superconducting Tokamak Advanced Research (KSTAR) and tungsten is being strongly considered as a divertor material of the international thermonuclear experimental reactor (ITER). In this experiment, graphite and tungsten targets were irradiated by using low-energy helium ions, and the irradiation’s influence on each target was studied with particular emphasis on the surface change. Changes in the surface morphology were observed by using scanning electron microscopy (SEM); induced disorders in the structure were investigated by using X-ray diffraction (XRD), Raman spectroscopy, and electron spin resonance (ESR) measurements.
    Journal- Korean Physical Society 10/2013; 63(7). DOI:10.3938/jkps.63.1422 · 0.43 Impact Factor

Publication Stats

11k Citations
1,645.08 Total Impact Points

Institutions

  • 2014
    • Gachon University
      Sŏngnam, Gyeonggi-do, South Korea
  • 2011–2014
    • Konkuk University
      • Department of Biological Engineering
      Sŏul, Seoul, South Korea
  • 2010–2014
    • National Fusion Research Institute
      Daiden, Daejeon, South Korea
    • Soon Chun Hyang University Hospital
      Sŏul, Seoul, South Korea
  • 2000–2014
    • Korea University
      • • Department of Materials Science and Engineering
      • • Department of Physics
      • • College of Nursing
      • • College of Medicine
      Sŏul, Seoul, South Korea
    • Gyeongsang National University
      Shinshū, Gyeongsangnam-do, South Korea
    • Jeonju National University of Education
      Tsiuentcheou, North Jeolla, South Korea
    • Kyorin University
      • Department of Chemistry
      Mitaka, Tōkyō, Japan
    • Fukuoka Institute of Technology
      Hukuoka, Fukuoka, Japan
    • Chonnam National University Hospital
      Sŏul, Seoul, South Korea
    • Sunchon National University
      Junten, South Jeolla, South Korea
  • 1998–2014
    • Sungkyunkwan University
      • • School of Medicine
      • • School of Advanced Materials Science and Engineering (AMSE)
      • • Department of Orthopedic Surgery
      • • Department of Computer Engineering
      Sŏul, Seoul, South Korea
    • Youngdong University
      Sŏul, Seoul, South Korea
    • Kyungnam University
      Changnyeong, South Gyeongsang, South Korea
  • 1994–2014
    • University of Seoul
      Sŏul, Seoul, South Korea
  • 2013
    • Korean Institute of Geoscience and Mineral Resources
      Daiden, Daejeon, South Korea
  • 2010–2013
    • Dankook University
      Eidō, North Chungcheong, South Korea
  • 2008–2013
    • Pusan National University
      • Department of Civil and Environmental Engineering
      Tsau-liang-hai, Busan, South Korea
    • Asan Medical Center
      • Department of Nuclear Medicine
      Sŏul, Seoul, South Korea
    • Bundang Jesaeng Hospital
      Sŏngnam, Gyeonggi Province, South Korea
    • RURAL DEVELOPMENT ADMINISTRATION
      Seikan-ri, South Chungcheong, South Korea
  • 2007–2013
    • Pohang University of Science and Technology
      • • Department of Materials Science and Engineering
      • • Pohang Accelerator Laboratory
      Geijitsu, Gyeongsangbuk-do, South Korea
    • Korea Institute of Nuclear Safety
      Sŏul, Seoul, South Korea
  • 2002–2013
    • Korea Electrotechnology Research Institute-KERI
      • Battery Research Center
      Tsau-liang-hai, Busan, South Korea
    • Korea Basic Science Institute KBSI
      Sŏul, Seoul, South Korea
  • 1992–2013
    • Chungbuk National University
      • College of Pharmacy
      Chinsen, Chungcheongbuk-do, South Korea
  • 2000–2012
    • Chosun University
      • Department of Nuclear Energy Engineering
      Gwangju, Gwangju, South Korea
  • 1997–2012
    • Yonsei University
      • • Department of Astronomy
      • • Department of Pediatrics
      • • Department of Biomedical Engineering
      • • Department of Biomedical Laboratory Science
      • • Department of Orthopaedic Surgery
      • • The Institute of Kidney Disease
      • • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • Korea Institute of Science and Technology
      Sŏul, Seoul, South Korea
  • 1996–2012
    • Chonnam National University
      • • Department of Material Science and Engineering
      • • Department of Internal Medicine
      • • Department of Pathology
      • • Department of Otolaryngology and Head and Neck Surgery
      Gwangju, Gwangju, South Korea
    • Wonju Severance Christian Hospital
      Genshū, Gangwon-do, South Korea
  • 1995–2012
    • Kyungpook National University
      • • Department of Astronomy and Atmospheric Sciences
      • • School of Computer Science and Engineering
      • • Department of Applied Chemistry
      • • Department of Anatomy
      Daikyū, Daegu, South Korea
  • 1992–2012
    • Seoul National University
      • • Department of Obstetrics and Gynecology
      • • Department of Anesthesiology
      • • College of Agriculture and Life Sciences
      • • Department of Physics and Astronomy
      • • Department of Nuclear Engineering
      • • Department of Agricultural Biotechnology
      • • Department of Pharmacology
      • • Department of Dentistry
      • • College of Dentistry
      Sŏul, Seoul, South Korea
  • 2010–2011
    • Seoul National University Bundang Hospital
      • Department of Dermatology
      Sŏul, Seoul, South Korea
  • 2007–2011
    • Georgia Institute of Technology
      • School of Electrical & Computer Engineering
      Atlanta, Georgia, United States
  • 2000–2011
    • Hallym University
      • College of Medicine
      Sŏul, Seoul, South Korea
  • 1995–2011
    • Catholic University of Korea
      • • Department of Radiology
      • • Department of Physics
      • • Department of Dermatology
      • • Department of Pathology
      • • College of Medicine
      • • Department of Ophthalmology
      Sŏul, Seoul, South Korea
  • 1993–2011
    • Yonsei University Hospital
      • • Department of Internal Medicine
      • • Surgery
      Sŏul, Seoul, South Korea
  • 1992–2011
    • Kyung Hee University
      • • Department of Medicine
      • • Department of Chemistry
      • • College of Pharmacy
      Seoul, Seoul, South Korea
  • 2004–2010
    • Gwangju Institute of Science and Technology
      • School of Environmental Science and Engineering
      Gwangju, Gwangju, South Korea
    • National Cancer Center Korea
      • Gastric Cancer Branch
      Kōyō, Gyeonggi-do, South Korea
    • University of Wollongong
      • Institute for Superconducting and Electronic Materials
      City of Greater Wollongong, New South Wales, Australia
    • Samsung Techwin Co.
      Onyang, Chungcheongnam-do, South Korea
    • Plant Genomics and Breeding Institute
      Sŏul, Seoul, South Korea
    • Stanford University
      Palo Alto, California, United States
  • 2009
    • Seoul Medical Center
      Sŏul, Seoul, South Korea
  • 2007–2009
    • National Institute of Animal Science
      Sŏul, Seoul, South Korea
  • 2003–2009
    • Inha University
      Chemulpo, Incheon, South Korea
  • 2002–2009
    • Chung-Ang University
      • School of Electrical and Electronics Engineering
      Sŏul, Seoul, South Korea
  • 2001–2009
    • Soonchunhyang University
      Onyang, Chungcheongnam-do, South Korea
    • Hyundai Heavy Industries
      Urusan, Ulsan, South Korea
    • Seonam University
      Onyang, South Chungcheong, South Korea
    • Kyushu University
      • Undergraduate School of Agriculture
      Hukuoka, Fukuoka, Japan
    • Heriot-Watt University
      • Department of Chemistry
      Edinburgh, Scotland, United Kingdom
  • 1998–2009
    • Korea Advanced Institute of Science and Technology
      • • Department of Electrical Engineering
      • • Department of Biological Sciences
      • • Department of Physics
      • • Department of Materials Science and Engineering
      Sŏul, Seoul, South Korea
  • 1996–2009
    • Ajou University
      • • Department of Obstetrics and Gynecology
      • • Department of Nephrology
      Sŏul, Seoul, South Korea
  • 2005–2008
    • Korea Institute of Energy Research
      Sŏul, Seoul, South Korea
    • Korea Maritime and Ocean University
      • Division of Electronics and Electrical Engineering
      Tsau-liang-hai, Busan, South Korea
    • Ufa State Aviation Technical University
      Oufa, Bashkortostan, Russia
    • University of Suwon
      Suigen, Gyeonggi Province, South Korea
    • Sun Moon University
      Onyang, Chungcheongnam-do, South Korea
  • 2003–2008
    • Ewha Womans University
      • Department of Pediatrics
      Sŏul, Seoul, South Korea
  • 2001–2008
    • Korea Atomic Energy Research Institute (KAERI)
      Daiden, Daejeon, South Korea
  • 1999–2008
    • Inje University
      • Department of Mechanical and Automotive Engineering
      Kŭmhae, South Gyeongsang, South Korea
    • Chungnam National University
      • • College of Medicine
      • • Department of Materials Science and Engineering
      Daiden, Daejeon, South Korea
  • 1997–2007
    • Seoul National University Hospital
      • • Department of Anesthesiology and Pain Medicine
      • • Department of Orthopedic Surgery
      • • Department of Radiology
      • • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2006
    • Hanbat National University
      Daiden, Daejeon, South Korea
    • Daewoo Engineering and Construction
      Sŏul, Seoul, South Korea
  • 2001–2006
    • Sogang University
      • Department of Electronic Engineering
      Sŏul, Seoul, South Korea
  • 1999–2006
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi-do, South Korea
    • University of Ulsan
      • • College of Medicine
      • • Department of Internal Medicine
      • • Department of Medicine
      Ulsan, Ulsan, South Korea
  • 1998–2004
    • Chonbuk National University
      • Research Center for Advanced Materials Development (RCAMD)
      Tsiuentcheou, Jeollabuk-do, South Korea
  • 2001–2002
    • Electronics and Telecommunications Research Institute
      Sŏul, Seoul, South Korea
  • 2000–2002
    • University of Strathclyde
      • Institute of Photonics
      Glasgow, Scotland, United Kingdom
  • 1995–2001
    • Okayama University
      • Faculty of Pharmaceutical Science
      Okayama, Okayama, Japan
    • Korea Research Institute of Bioscience and Biotechnology KRIBB
      • Anticancer Research Laboratory
      Ansan, Gyeonggi, South Korea
  • 1999–2000
    • Northern Inyo Hospital
      BIH, California, United States
  • 1998–2000
    • Ulsan University Hospital
      Urusan, Ulsan, South Korea
  • 1995–1997
    • Wonkwang University
      • Department of Medicine
      Riri, North Jeolla, South Korea