Y. J. Park

Kongju National University, Gongju, Chungcheongnam-do, South Korea

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Publications (362)722.11 Total impact

  • Y Hwangbo · J H Kim · S W Kim · Y J Park · D J Park · S Y Kim · C S Shin · N H Cho
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    ABSTRACT: Trabecular bone scores (TBS) have recently been developed as a diagnostic tool to assess bone texture. We studied thyroid status and TBS in a population-based cohort and demonstrated that high-normal thyroxine levels are associated with low TBS in healthy euthyroid postmenopausal women. Increased thyroid hormone levels affect bone mineral density (BMD) and, if untreated, increase the risk of fracture. However, the relationship between thyroid function and bone microarchitecture has not yet been established. Trabecular bone scores (TBS) are gray-level textural measurements of dual energy X-ray absorptiometry (DXA) images. The TBS has been proposed as an indirect index of bone microarchitecture. The goal of this study was to characterize the relationship between thyroid function and TBS in euthyroid men and postmenopausal euthyroid women. A total of 1376 euthyroid subjects (648 postmenopausal women and 728 men) were recruited from a community-based cohort in Korea. Free thyroxine (fT4) levels, thyroid stimulating hormone (TSH) levels, BMD, and TBS were measured and compared. There was no significant relationship between either fT4 or TSH levels and BMD in men and women. Multiple linear regression analysis showed that high-normal fT4 levels were negatively correlated with TBS (β = -0.111; P = 0.002, after adjusting for both age and body mass index [BMI]) in postmenopausal women. In men, however, there was no significant correlation between fT4 levels and TBS. TSH levels were not significantly associated with TBS in either men or women. Higher fT4 levels within the normal reference range are associated with deterioration of trabecular microarchitecture in healthy euthyroid postmenopausal women.
    Osteoporosis International 08/2015; DOI:10.1007/s00198-015-3270-3 · 4.17 Impact Factor
  • D. G. Yang · Y.H. Choi · D. H. Kang · Y.J. Park · H. G. Lee
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    ABSTRACT: In this study, sudden discharge tests were performed on partially-insulated (PI) GdBCO coated conductor single-pancake coils to investigate the effects of a PI winding scheme on the discharge characteristics. Three sets of PI coils were constructed with insulation at 3 different intervals: every 2nd, 4th, and 8th turn. Each set included coils with 4 different insulation-angles: 90°, 180°, 270°, and 360°. Discharge delay of the PI coils was alleviated by increasing the insulation-interval or insulation-angle due to increased insulated area, which partially hinders radial current flow. The results of the sudden discharge test were in fairly good agreement with simulations of the PI coils using an equivalent circuit model consisting of a single RL circuit in parallel. The characteristic resistance of the PI coils was reasonably estimated through the numerical approach with contact surface resistance and compensation for the current-bottleneck effect, which enables the PI coils to be utilized in practical superconducting magnet applications.
    Current Applied Physics 02/2015; 15(2). DOI:10.1016/j.cap.2014.11.010 · 2.21 Impact Factor
  • S-J Kwon · J Yu · Y.J. Park · J-H Son · N-S Kim · J K Lee
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    ABSTRACT: Seed shattering of wild plant species is thought to be an adaptive trait to facilitate seed dispersal. For rice breeding, seed shatter-ing is an important trait for improving breeding strategies, particularly when developing lines use interspecific hybrids and introgression of genes from wild species. We developed F3:4 recombinant inbred lines from an interspecific cross between Oryza sativa cv. Ilpoombyeo and Oryza rufipogon. In this study, we genetically analyzed known shat-tering-related loci using the F3:4 population of O. sativa/O. rufipogon. CACTA-AG190 was significantly associated with the shattering trait CACTA-TD according to bulked segregant analysis results, and was found in the qSH-1 region of chromosome 1. Fine genetic mapping of the flanking regions around qSH-1 based on CACTA-AG190 revealed multiple-sequence variations. The highest limit of detection based on quantitative trait locus analysis was observed between shaap-7715 and a 518-bp insertion site. Two other quantitative trait locus analyses of seed-shattering-related loci, qSH-4 and sh-h, were performed using simple sequence repeat and allele-pecific single nucleotide polymor-phism markers. Our results can be applied for rice-breeding research, such as marker-assisted selection between cultivated and wild rice.
    Genetics and molecular research: GMR 02/2015; 14(1):1347-1361. DOI:10.4238/2015.February.13.14 · 0.78 Impact Factor
  • D.H. Kang · K.L. Kim · Y.G. Kim · Y.J. Park · W.J. Kim · S.H. Kim · H.G. Lee
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    ABSTRACT: This paper presents the effects of thermal grease on the electrical and thermal characteristics of GdBCO pancake coils, observed through charge-discharge, sudden discharge, over-current, and thermal quench testing. In charge-discharge and sudden discharge tests, a coil using thermal grease as an insulation material demonstrated faster charging/discharging rates compared to a coil without turn-to-turn insulation. In the case of over-current tests, the coil using thermal grease exhibited the highest electrical stability. Furthermore, thermal quench testing showed the coil employing thermal grease to possess superior thermal characteristics, with rapid cooling and low temperature rise. Overall, the use of thermal grease as an insulation material may be a potential solution to the problems observed with the existing insulation materials, possessing fast charging/discharging rates with superior thermal and electrical stabilities.
    Review of Scientific Instruments 09/2014; 85(9):094701-094701-7. DOI:10.1063/1.4894202 · 1.61 Impact Factor
  • Y J Park · M W Lee · Y K Oh · H G Lee
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    ABSTRACT: While GdBa2Cu3O7 − δ (GdBCO) coated conductors (CCs) have been proposed for superconducting applications, they have not been used in devices with persistent current mode (PCM) operation because of a lack of joining techniques. A superconducting joint of CCs, formed via melting diffusion and oxygenation annealing, offers no electrical resistance between the CCs, thus establishing a superconducting closed loop for PCM operation. Because superconductivity degrades with oxygen out-diffusion during melting diffusion, oxygenation annealing allows oxygen diffusion into the GdBCO lattices. As effective oxygenation annealing requires oxygen pathways in the joint, low solubility and diffusivity of oxygen in the buffer and CC substrate hinder full superconductivity recovery. Here we show a laser-drilling technique to produce microholes as conduits on the surfaces of GdBCO CCs' to promote oxygen in-diffusion, which resulted in reduced superconductivity recovery time. Superconductivity was fully recovered after laser drilling, melting diffusion at 850 °C for 1 min, and oxygenation annealing at 500 °C for 350 h.
    Superconductor Science and Technology 07/2014; 27(8):085008. DOI:10.1088/0953-2048/27/8/085008 · 2.33 Impact Factor
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    F P Li · Y.S. Lee · S W Kwon · G Li · Y.J. Park
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    ABSTRACT: This study analyzed 394 Korean rice landrace accessions, including 93 waxy varieties, for polymorphisms using 29 simple sequence repeat (SSR) markers. In total, 381 alleles served as raw data for estimating the genetic diversity (GD) and population structure. The number of alleles per locus ranged from 3 to 44 (average = 13.14). The expected heterozygosity and polymorphism information content (PIC) ranged from 0.0341 to 0.9358 (mean = 0.5623) and from 0.0783 to 0.9367 (mean = 0.5839), respectively. The mean GDs in waxy, low amylose content, intermediate amylose content, and high amylose content (HAC) varieties were 0.6014, 0.5922, 0.5858, and 0.7232, respectively, whereas the mean PIC values for each SSR locus were 0.5701, 0.5594, 0.5550, and 0.6926, respectively. HAC varieties had the highest GD and PIC. Consistent with clustering by genetic distances, a model-based structural analysis revealed 3 subpopulations. Analysis of molecular variance revealed that the between-population component of genetic variance was 22.35%, and that of the within-population component was 77.65%. Significant correlations were observed between eating quality and protein content (r = -0.262), K(+) (r = -0.655), Mg(2+) (r = -0.680), 1000-GW (r = 0.159), and amylose content (r = -0.134). The overall FST value was 0.2235, indicating moderate differentiation among the groups. Analysis of variance of the 3 genetic groups (mean of 9 phenotypic and 5 physicochemical traits) by Duncan's multiple range test showed significant differences in 10 traits. This preliminary study represents a first step toward more efficient conservation and greater utilization of rice landraces to broaden the genetic bases of commercially grown varieties.
    Genetics and molecular research: GMR 04/2014; 13(AOP). DOI:10.4238/2014.April.14.12 · 0.78 Impact Factor
  • J-H Shin · S G Kang · Y K Hong · S S Jeun · S W Kim · J H Cho · Y J Park
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    ABSTRACT: Background: This study examined the relationship between the superior turbinate and natural ostium of the sphenoid sinus, as seen during the endoscopic endonasal transsphenoidal approach (EETSA) for sellar lesions and described how to enter the sphenoethmoid cell safely for complete exposure of the sellar floor, including adjacent vital structures such as the prominence of the optic nerve and carotid artery. Materials and methods: This study retrospectively reviewed the medical records and operative findings of 154 patients, who underwent EETSA between February 2009 and February 2011. We evaluated the location of the natural ostium of the sphenoid sinus relative to the superior turbinate and revealed the clinical significance of the superior turbinate as a surgical guide to enter into the sphenoethmoid cell during EETSA. Results: The natural ostium of the sphenoid sinus was located medially to the posteroinferior end of the superior turbinate in 151 (98%) patients. In 1 patient, the natural ostia of the sphenoid sinus were located lateral to the superior turbinate bilaterally. Sphenoethmoid cell was encountered in 53 (34%) patients. We could easily enter the sphenoethmoid cell at the point where the superior turbinate was attached to the anterior wall of the sphenoid sinus. Conclusions: The superior turbinate is a good surgical landmark for identifying the natural ostium of the sphenoid sinus and as a guide for the surgical entrance to the sphenoethmoid cell extending to the sphenoid sinus during EETSA.
    Folia morphologica 02/2014; 73(1):73-8. DOI:10.5603/FM.2014.0010 · 0.34 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(3):034802. · 7.51 Impact Factor
  • J.A. Lee · C.Y. Kim · Y.J. Park · W.S. Yoon · N.K. Lee · D.S. Yang
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    ABSTRACT: To determine the variability of patient positioning errors associated with intensity-modulated radiotherapy (IMRT) for prostate cancer and to assess the impact of thermoplastic pelvic immobilization on these errors using kilovoltage (kV) cone-beam computed tomography (CBCT). From February 2012 to June 2012, the records of 314 IMRT sessions in 19 patients with prostate cancer, performed with or without immobilization at two different facilities in the Korea University Hospital were analyzed. The kV CBCT images were matched to simulation computed tomography (CT) images to determine the simulation-to-treatment variability. The shifts along the x (lateral)-, y (longitudinal)- and z (vertical)-axes were measured, as was the shift in the three dimensional (3D) vector. The measured systematic errors in the immobilized group during treatment were 0.46 ± 1.75 mm along the x-axis, - 0.35 ± 3.83 mm along the y-axis, 0.20 ± 2.75 mm along the z-axis and 4.05 ± 3.02 mm in the 3D vector. Those of nonimmobilized group were - 1.45 ± 7.50 mm along the x-axis, 1.89 ± 5.07 mm along the y-axis, 0.28 ± 3.81 mm along the z-axis and 8.90 ± 4.79 mm in the 3D vector. The group immobilized with pelvic thermoplastics showed reduced interfractional variability along the x- and y-axes and in the 3D vector compared to the nonimmobilized group (p < 0.05). IMRT with thermoplastic pelvic immobilization in patients with prostate cancer appears to be useful in stabilizing interfractional variability during the planned treatment course.
    Strahlentherapie und Onkologie 01/2014; 190(1):94-99. DOI:10.1007/s00066-013-0452-9 · 2.91 Impact Factor
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    H-Y Nam · J C Paeng · J-K Chung · K W Kang · G J Cheon · Y Kim · D J Park · Y J Park · H S Min · D S Lee
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    ABSTRACT: Aim: Serum antithyroglobulin antibody (TgAb) has been reported as a surrogate marker for differentiated thyroid cancer (DTC) in some conditions. We investigated changes in serum TgAb levels after stimulation with thyroid-stimulating hormone (TSH) and the clinical implications for monitoring DTC. Patients, methods: We retrospectively enrolled 53 DTC patients who had undergone total thyroidectomy and were negative for serum Tg and positive for TgAb. Patients underwent high-dose radioactive iodine treatment, and serum TgAb was measured before (TgAbBAS) and after TSH stimulation (TgAbSTIM). TgAb was followed up 6 to 12 months later (TgAbF/U). The change in TgAb after TSH stimulation (∆TgAbSTIM) was calculated as a percentage of the baseline level. Patient disease status was classified into no residual disease (ND) and residual or recurred disease (RD) by follow-up imaging studies and pathologic data. The characteristics and diagnostic value of serum TgAb levels and ∆ TgAbSTIM were investigated with respect to disease status. Results: 38 patients were in the ND group and 15 were in the RD group. TgAbBAS, TgAbSTIM and TgAbF/U were significantly higher in the RD compared to the ND group (p = 0.0008, 0.0002, and < 0.0001, respectively). ∆TgAbSTIM was also significantly higher in the RD group (p = 0.0009). In the patients who presented with obviously high (≥ 50%) or low (< -50%) ∆ TgAbSTIM, the proportions in the RD group were markedly different at 100% and 7%, respectively. ∆ TgAbSTIM had significant diagnostic value for RD (p < 0.001). Conclusion: The change in serum TgAb level after TSH stimulation is different between the RD and ND groups, and thus, it may be used as a surrogate diagnostic marker for DTC when the serum Tg is negative and TgAb is positive.
    Nuklearmedizin 11/2013; 53(2). DOI:10.3413/Nukmed-0604-13-06 · 1.49 Impact Factor
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    ABSTRACT: Chrysanthemums are well known for their esthetic and medicinal values. Characterization of chrysanthemums is vital for their conservation and management as well as for understanding their genetic relationships. We found 12 simple sequence repeat markers (SSRs) of 100 designed primers to be polymorphic. These novel SSR markers were used to evaluate 95 accessions of chrysanthemums (3 indigenous and 92 cultivated accessions). Two hundred alleles were identified, with an average of 16.7 alleles per locus. KNUCRY-77 gave the highest polymorphic information content value (0.879), while KNUCRY-10 gave the lowest (0.218). Similar patterns of grouping were observed with a distance-based dendrogram developed using PowerMarker and model-based clustering with Structure. Three clusters with some admixtures were identified by model-based clustering. These newly developed SSR markers will be useful for further studies of chrysanthemums, such as taxonomy and marker-assisted selection breeding.
    Genetics and molecular research: GMR 11/2013; 12(4):5335-47. DOI:10.4238/2013.November.7.8 · 0.78 Impact Factor
  • D G Yang · K L Kim · Y H Choi · O J Kwon · Y J Park · H G Lee
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    ABSTRACT: In this study, empirical and numerical analyses on the screening current-induced field (SCIF) characteristics of a non-insulated (NI) GdBCO-coated conductor single-pancake coil were conducted. Charge and discharge tests were carried out to induce an SCIF in the NI test coil. The SCIF in the NI coil was identified by comparison between the measured and calculated magnetic fields. The experimental results exhibit an increase of the SCIF with increasing an operating current, as well as a logarithmic decay of the SCIF as a function of time. Moreover, the SCIF was not affected by the slow discharge of the NI coil. The estimation of the SCIF based on the critical-state model in a thin film using the finite element method was in fairly good agreement with the experimental results.
    Superconductor Science and Technology 09/2013; 26(10):105025. DOI:10.1088/0953-2048/26/10/105025 · 2.33 Impact Factor
  • Y.G. Kim · J B Song · D G Yang · J S Lee · Y.J. Park · D H Kang · H G Lee
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    ABSTRACT: This paper reports experimental and analytical studies on the capture efficiency of a superconducting high-gradient magnetic separation (HGMS) system, employing ferromagnetic filters with various wire diameters and packing fractions. The magnetization force was inversely proportional to wire diameter because the magnetic field gradient increased with decreasing wire diameter. In addition, the capture efficiency of the HGMS system was increased with decreasing wire diameter and increasing packing fraction. The experimental results from the filtration tests via the superconducting HGMS system were in reasonably good agreement with the capture efficiency using the magnetization force obtained by magnetic field analysis.
    Superconductor Science and Technology 06/2013; 26(8):085002. DOI:10.1088/0953-2048/26/8/085002 · 2.33 Impact Factor
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    ABSTRACT: Purpose The aim of this work was to establish a customized strategy for image-guided radiotherapy during whole breast irradiation. Risk factors associated with extensive errors were assessed. Methods and materials A series of 176 consecutive breasts in 174 patients were retrospectively assessed. Electronic portal images from 914 medial and 807 lateral directions were reviewed. On the basis of the chest wall, the deviations between the simulation and each treatment were measured. The systematic (Σ) and random error (σ) of population, and the planning target volume (PTV) margin (2 Σ + 0.7σ) were calculated for each direction. Extensive set-up errors were defined as the fraction over the PTV margins in any direction. For extensive set-up errors, χ2 tests and logistic regression analyses were conducted. Results The medial and lateral PTV margins for the right–left, superior–inferior, and anterior–posterior axes and the rotation of collimator were 2.6 and 2.4 mm, 4.6 and 4.6 mm, and 3.1 and 3.3 mm and 2.8 and 2.9 ° and cut-off values for extensive errors were 3, 5, and 4 mm and 3 °, respectively. In χ2 tests, tumor in upper outer quadrant (p = 0.012) and chest wall thickness ≥ 2.0 cm (p = 0.003) for medial portals and age group (p = 0.036) for lateral portals were associated with extensive errors. In multivariate tests, the extensive error on the initial fraction had a high probability of extensive set-up errors in both medial (OR = 4.26, p < 0.001) and lateral portals (OR = 3.07, p < 0.001). Conclusion In terms of the set-up uncertainty during breast irradiation, patients with extensive error in the initial treatment should be closely observed with serial image-guided radiotherapy.
    Strahlentherapie und Onkologie 04/2013; 189(4). DOI:10.1007/s00066-012-0271-4 · 2.91 Impact Factor
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    ABSTRACT: The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the high resolution cavity beam position monitor (BPM) system, which is a part of the ATF2 diagnostics. Two types of cavity BPMs are used, C-band operating at 6.423 GHz, and S-band at 2.888 GHz with an increased beam aperture. The cavities, electronics, and digital processing are described. The resolution of the C-band system with attenuators was determined to be approximately 250 nm and 1 m for the S-band system. Without attenuation the best recorded C-band cavity resolution was 27 nm.
    Review of Modern Physics 01/2013; 15(4). DOI:10.1103/PhysRevSTAB.15.042801 · 29.60 Impact Factor
  • S. W. Lee · Y. S. Cho · W. C. Choi · J. H. Lee · Y. J. Park
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    ABSTRACT: This study aims to investigate the combustion characteristics of mixed fuel of liquefied propane gas (LPG) and biodiesel under compression ignition (CI) in an effort to develop highly efficient and environmentally friendly mixed fuelbased CI engines. Although LPG fuel is known to be eco-friendly due to its low CO2 emission, LPG has not yet been widely applied for highly efficient CI engines because of its low cetane number and is usually mixed with other types of CI-friendly fuels. In this study, a number of experiments were prepared with a constant volume chamber (CVC) setup to understand the fundamental combustion characteristics of mixed fuel with LPG and biodiesel in two weight-based ratios and exhaust gas recirculation (EGR) conditions. The results from the current investigations verify the applicability of mixed fuel of LPG and biodiesel in CI engines with a carefully designed combustion control strategy that maximizes the benefits of the mixed fuel. Based on the results of this study, ignition is improved by increasing the cetane value by using higher blending ratios of biodiesel. As the blending ratios of biodiesel increased, CO and HC decreased and CO2 and NOx increases.
    International Journal of Automotive Technology 12/2012; 13(7). DOI:10.1007/s12239-012-0118-0 · 0.97 Impact Factor
  • E. J. Oh · S. W. Jung · Y.-J. Park · Y. G. Kim · D. G. Kim · Y. K. Yoo
    Transplantation 11/2012; 94(10S):1190. DOI:10.1097/00007890-201211271-02361 · 3.83 Impact Factor
  • G Li · S W Kwon · Y J Park
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    ABSTRACT: After complete sequencing of its genome and annotation of the majority of its ~32,000 genes, rice genome has become the model genome among the cereal genomes, and the focus has shifted from structural to functional genomics and application of genomics-derived information in rice breeding. During the past 2 decades, intensive worldwide efforts have led to significant improvements in rice. An abundance of molecular markers and information related to many genes/quantitative trait loci that control agronomically important traits such as yield, quality, and biotic and abiotic stress tolerance have been identified. Bridging the application gap between quantitative trait locus identification and marker-assisted selection breeding is an urgent, arduous, and long-term task. Marker development, allele mining, gene discovery, and molecular breeding have progressed to a great extent because of the rapid development of next-generation sequencing, large-scale high-density genotyping, and genome-wide selection strategies. The availability of high-density markers and the rapidly decreasing cost of genotyping have facilitated marker-assisted selection of many traits that were previously not possible.
    Genetics and molecular research: GMR 09/2012; 11(AOP). DOI:10.4238/2012.September.10.4 · 0.78 Impact Factor
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    S. M. Kim · J. I. Sohn · H. J. Kim · J. Ku · Y. J. Park · S. N. Cha · J. M. Kim
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    ABSTRACT: A theoretical model for the radially dependent effective piezoelectric coefficient and corresponding piezoelectric potential in intrinsic ZnO nanowires (NWs)/nanotubes (NTs) is presented. Substrate-bound ZnO structures oriented along the c-axis with diameters of 100–5000 nm (NWs) and inner diameters of 100–900 nm (NTs; fixed outer diameter, 1000 nm) were examined using finite element method analysis. The piezoelectric potential depended nonlinearly on the NT/NW size, which we explain using the effective piezoelectric coefficient and peak piezoelectric potentials. We propose that this coefficient can be used to judge the degree of enhancement of the piezoelectric potential in ZnO NWs/NTs.
    Applied Physics Letters 07/2012; 101(1). DOI:10.1063/1.4731779 · 3.30 Impact Factor
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    ABSTRACT: Hypermucoviscous (HV) isolates of Klebsiella pneumoniae have been linked to virulence potential in experimental infections. We examined 33 isolates of K. pneumoniae from patients with bacteraemia for the HV phenotype on agar culture, and determined their virulence potential by screening for capsular (K) serotype by polymerase chain reaction and the presence of seven virulence factor genes. Fourteen (42·4%) isolates expressed the HV phenotype and 11 of these were serotype K1 or K2; these serotypes were not identified in HV-negative isolates. The genes rmpA, rmpA2, aerobactin, wabG and allS were significantly more frequent in HV than non-HV isolates. Multilocus sequence typing identified 21 sequence types (ST), eight of which were found in HV-positive isolates and the clonal relatedness of isolates of the most frequent types (ST23 and ST11) from different hospitals was confirmed by pulsed-field gel electrophoresis. The HV phenotype was more associated with community-acquired infection with a lower frequency of fatal underlying illness, but with significantly more focal infections, notably liver abscesses. Clinicians should be aware of such clinical impacts of the HV phenotype.
    Epidemiology and Infection 05/2012; 141(2):1-7. DOI:10.1017/S0950268812000933 · 2.54 Impact Factor

Publication Stats

3k Citations
722.11 Total Impact Points


  • 2010–2015
    • Kongju National University
      • Department of Plant Resources
      Gongju, Chungcheongnam-do, South Korea
    • Sookmyung Women's University
      • Department of Chemistry
      Sŏul, Seoul, South Korea
  • 1989–2015
    • Korea University
      • • Department of Materials Science and Engineering
      • • Department of Physics
      • • College of Nursing
      • • Department of Electrical Engineering
      Sŏul, Seoul, South Korea
  • 1999–2014
    • Catholic University of Korea
      • • Department of Neurosurgery
      • • Department of Laboratory Medicine
      • • Department of Internal Medicine
      • • College of Medicine
      Sŏul, Seoul, South Korea
  • 1998–2013
    • Pohang Accelerator Laboratory
      Urusan, Ulsan, South Korea
    • Yonsei University
      Sŏul, Seoul, South Korea
  • 2012
    • SAIT Polytechnic
      Calgary, Alberta, Canada
  • 2008–2012
    • Kookmin University
      • Graduate School of Automotive Engineering
      Sŏul, Seoul, South Korea
  • 2011
    • Korea Institute of Energy Research
      Sŏul, Seoul, South Korea
  • 1997–2011
    • Korea Atomic Energy Research Institute (KAERI)
      • Nuclear Chemistry Research Division
      Daiden, Daejeon, South Korea
  • 1995–2011
    • Pohang University of Science and Technology
      • Pohang Accelerator Laboratory
      Antō, North Gyeongsang, South Korea
  • 2007–2008
    • Samsung Electro-Mechanics
      Sŏul, Seoul, South Korea
  • 2001–2008
    • Inha University
      • • Department of Physics
      • • College of Medicine
      Seoul, Seoul, South Korea
    • Pai Chai University
      Sŏul, Seoul, South Korea
    • Kyungpook National University
      • Department of Microbiology
      Daikyū, Daegu, South Korea
    • Electronics and Telecommunications Research Institute
      Sŏul, Seoul, South Korea
    • Chung-Ang University
      Sŏul, Seoul, South Korea
  • 1997–2008
    • Korea Institute of Science and Technology
      • Center for Opto-Electronic Convergence Systems
      Sŏul, Seoul, South Korea
  • 1999–2007
    • Sogang University
      • Department of Physics
      Sŏul, Seoul, South Korea
  • 1998–2006
    • Korea Advanced Institute of Science and Technology
      • • Department of Materials Science and Engineering
      • • Department of Electrical Engineering
      Sŏul, Seoul, South Korea
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi-do, South Korea
  • 2005
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2004–2005
    • Dongguk University
      • Quantum-functional Semiconductor Research Center
      Sŏul, Seoul, South Korea
    • Korea Basic Science Institute KBSI
      Sŏul, Seoul, South Korea
  • 2003–2005
    • Hanyang University
      • • Department of Electronics and Computer Engineering
      • • Department of Physics
      Sŏul, Seoul, South Korea
  • 2002–2005
    • Sungkyunkwan University
      • • Samsung Medical Center
      • • Department of Radiation Oncology
      Sŏul, Seoul, South Korea
  • 2000–2005
    • Seoul National University Hospital
      • • Department of Internal Medicine
      • • Department of Surgery
      Sŏul, Seoul, South Korea
    • Hongik University
      • Department Electronic and Electrical Engineering
      Sŏul, Seoul, South Korea
  • 1993–2005
    • Seoul National University
      • • School of Electrical Engineering and Computer Sciences
      • • Department of Internal Medicine
      • • Department of Materials Science and Engineering
      • • Department of Electrical and Computer Engineering
      Sŏul, Seoul, South Korea
    • University of Seoul
      Sŏul, Seoul, South Korea
  • 1998–2003
    • Ewha Womans University
      • Department of Electronics Engineering
      Sŏul, Seoul, South Korea
  • 2001–2002
    • University of Michigan
      • • Department of Pharmaceutical Sciences
      • • College of Pharmacy
      Ann Arbor, Michigan, United States