Se Hyun Kim

Dongguk University, Sŏul, Seoul, South Korea

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Publications (175)822.51 Total impact

  • Organic Electronics 01/2016; 28:139-146. DOI:10.1016/j.orgel.2015.10.025 · 3.83 Impact Factor

  • Semiconductor Science and Technology 12/2015; 30(12):125016. DOI:10.1088/0268-1242/30/12/125016 · 2.19 Impact Factor
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    ABSTRACT: Understanding charge trapping in a polymer dielectric is critical to the design of high-performance organic field-effect transistors (OFETs). We investigated the OFET stability as a function of the dielectric polymer stereostructure under a gate bias stress and during long-term operation. To this end, iso-, syn-, and atactic poly(methyl methacrylate) (PMMA) polymers with identical molecular weights and polydispersity indices were selected. The PMMA stereostructure was found to significantly influence the charge trapping behavior and trap formation in the polymer dielectrics. This influence was especially strong in the bulk region, rather than in the surface region. The regular configurational arrangements (isotactic > syntactic > atactic) of the pendant groups on the PMMA backbone chain facilitated closer packing between the polymer inter-chains and led to a higher crystallinity of the polymer dielectric, causing a reduction in the free volumes that act as sites for charge trapping and air molecule absorption. The PMMA dielectrics with regular stereostructures (iso- and syn-stereoisomers) exhibited more stable OFET operation under bias stress compared to devices prepared using irregular a-PMMA in both vacuum and air.
    ACS Applied Materials & Interfaces 10/2015; 7(45). DOI:10.1021/acsami.5b08414 · 6.72 Impact Factor

  • Dyes and Pigments 10/2015; DOI:10.1016/j.dyepig.2015.09.026 · 3.97 Impact Factor
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    ABSTRACT: Despite both depression and metabolic disturbances confer substantial burden of disease, natural course of depressive symptoms and the relationship with metabolic adversities have not examined. We explore associations between trajectories of depressive symptoms and metabolic disturbance, lifestyle factors and comorbidities. This retrospective cohort study included 13,745 subjects (8113 men and 5632 women) 40-59 years of age who underwent health examinations at the Seoul National University Hospital Healthcare System, Gangnam Center, in Korea. The median follow-up duration was 4.0 years. We estimated the mean trajectories of the Beck Depression Inventory scores using latent-class growth-curve analysis. We identified four distinctive trajectories of depressive symptoms in both sex. The probabilities of group membership were 35.1% (n=2374) in minimal, 47.4% (n=4545) in persistent-mild, 14.4% (n=987) in persistent-moderate, and 3.0% (n=207) in persistent-severe in men, and 36.3% (n=1883), 50.0% (n=3069), 12.3% (n=601) and 1.5% (n=79) in women. We found significant increasing trend in the prevalence of metabolic abnormalities in more severe depressive trajectory. The adjusted odds ratios of persistent-severe were significantly increased for the following variables: low HDL, hypertriglyceridemia, and metabolic syndrome (MetS) in men and hypertriglyceridemia, MetS in women, and smoking, alcohol consumption and lack of exercise in both genders. Medical and psychiatric histories were obtained using a self-reported questionnaire rather than formal diagnostic assessments. The higher level of depressive symptoms trajectory was associated with MetS, especially lipid abnormalities, and several modifiable lifestyle factors. Our findings provide important implications for developing health policy and guidelines for reducing depressive symptom burden. Copyright © 2015 Elsevier B.V. All rights reserved.
    Journal of Affective Disorders 09/2015; 188:14-21. DOI:10.1016/j.jad.2015.08.024 · 3.38 Impact Factor
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    ABSTRACT: Poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) was blended with polyethylene oxide (PEO) and polyvinyl alcohol (PVA) and composite film was cast. Additional solvents of dimethyl sulfoxide (DMSO) and ethylene glycol (EG) were mixed and their effects on electrical conductivity and structural changes were investigated. The electrical conductivity increased in response to the additional solvent, leading to an increase in the PEDOT ratio relative to the control. PEDOT:PSS/PEO composite film had a much higher electrical conductivity than PEDOT:PSS/PVA. When blended with PEO, the quinoid structure revealed by Raman spectroscopy increased relative to the PVA-blended case, indicating higher electrical conductivity. The current–voltage response and gas sensitivity showed much better performance in PEDOT:PSS/PEO/DMSO composite film. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42628.
    Journal of Applied Polymer Science 07/2015; 132(40). DOI:10.1002/app.42628 · 1.77 Impact Factor
  • Jiye Kim · So Hee Lee · Haekyoung Kim · Se Hyun Kim · Chan Eon Park ·
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    ABSTRACT: We successfully fabricate high performance bottom-contact organic field-effect transistors (OFETs) using AgNW networks electrodes by spray deposition. The synthesized AgNWs have the dimension of 40-80 nm in diameter and 30-80 µm in length and were randomly distributed and interconnected to form a 3D hollow framework. The AgNWs film, deposited by spray coating, yielded an average optical transmittance of up to 88 % and a sheet resistance as low as 10 ohm/sq. For using AgNWs as source/drain electrodes of OFETs with bottom-contact configuration, the large contact resistance at AgNWs/organic channel remains critical issue for charge injection. To enhance charge injection, we fabricate semiconductor crystals on the AgNW using adsorbed residual poly(N-vinylpyrrolidone) layer. The resulting bottom-contact OFETs exhibit high mobility up to 1.02 cm2/Vs, and are similar to that of the top-contact Au electrodes OFETs with low contact resistance. A morphological study shows that the pentacene crystals coalesced to form continuous morphology on the nanowires, and were highly interconnected with those on the channel. These features contribute to efficient charge injection and encourage the improvement of the bottom-contact device performance. Furthermore, large contact area of individual AgNWs spreading out to the channel at the edge of the electrode also improves device performance.
    ACS Applied Materials & Interfaces 06/2015; 7(26). DOI:10.1021/acsami.5b02610 · 6.72 Impact Factor
  • Se Hyun Kim · Chan Yeong Jung · Hogyoung Kim · Yunae Cho · D.-W. Kim ·
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    ABSTRACT: We fabricated the Cu Schottky contact on an n-type Ge wafer and investigated the forward bias current-voltage (I-V) characteristics in the temperature range of 100~300 K. The zero bias barrier height and ideality factor were determined based on the thermionic emission (TE) model. The barrier height increased and the ideality factor decreased with increasing temperature. Such temperature dependence of the barrier height and the ideality factor was associated with spatially inhomogeneous Schottky barriers. A notable deviation from the theoretical Richardson constant (140.0 Acm-2K-2 for n-Ge) on the conventional Richardson plot was alleviated by using the modified Richardson plot, which yielded the Richardson constant of 392.5 Acm-2K-2. Finally, we applied the theory of space-charge-limitedcurrent (SCLC) transport to the high forward bias region to find the density of localized defect states (Nt), which was determined to be 1.46 × 1012 eV-1cm-3.
    Transactions on Electrical and Electronic Materials 06/2015; 16(3):151-155. DOI:10.4313/TEEM.2015.16.3.151
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    ABSTRACT: Cisplatin is a potent chemotherapeutic agent, but its nephrotoxicity, which results in acute kidney injury (AKI), often limits its clinical application. Although many studies have attempted to target the mechanism responsible for its nephrotoxicity, no such method has been demonstrated to be effective in clinical trials. Recently, a dipeptidyl peptidase-4 (DPP4) inhibitor has been reported to have a renoprotective effect in a mouse model of cisplatin-induced AKI. Therefore, we will evaluate whether a DPP4 inhibitor protects the kidney from cisplatin-induced injury in humans. This is a single-center, prospective, randomized, double-blind, placebo-controlled trial. A total of 182 participants who are scheduled for cisplatin treatment will be enrolled and randomly assigned to receive either a DPP4 inhibitor (gemigliptin) or a placebo. Participants will take the study drugs for 8 days starting 1 day before cisplatin treatment. The primary outcome of interest is the incidence of AKI at 7 days after finishing treatment with cisplatin. The secondary outcomes include changes in serum creatinine levels and estimated glomerular filtration rates from baseline to 7 days after cisplatin treatment. This is the first clinical trial to investigate the effect of a DPP4 inhibitor on cisplatin-induced AKI. number NCT02250872, December 26, 2014.
    Trials 05/2015; 16(1):239. DOI:10.1186/s13063-015-0772-4 · 1.73 Impact Factor
  • Se Hyun Kim · Kyunghun Kim · Haekyoung Kim · Chan Eon Park ·
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    ABSTRACT: The electrical stabilities of low-voltage organic field-effect transistors (OFETs) were improved by graftable fluorinated polymer (gPFS) layers and applying these layers onto poly(4-vinyl phenol)-based crosslinked dielectrics (cPVP). As a result, smooth and hydrophobic surface is formed and the dielectric film displayed a low leakage current density. The chemisorbed gPFS groups enabled the solution processing of an overlying 5,11-bis(triethylsilylethynyl)anthradithiophene (TES-ADT) semiconductor, which formed favorable terrace-like crystalline structures after solvent annealing. The top-contact OFETs showed superior operational stability compared to the cPVP-based OFETs. The hysteresis behavior in this top-contact OFET was negligible, and the off current of the transfer curve was one order of magnitude lower than the off current obtained from the cPVP-based OFET. The threshold voltage shift, measured after a sustained gate bias stress over 1 h, decreased significantly upon introduction of the hydrophobic gPFS treatment, the energetic barrier to creating charge trapping sites increased, and the trap distribution narrowed, as supported by a stretched exponential function model.
    Physical Chemistry Chemical Physics 05/2015; 17(26). DOI:10.1039/C5CP01909E · 4.49 Impact Factor
  • Mi Jang · Se Hyun Kim · Han‐Koo Lee · Yun‐Hi Kim · Hoichang Yang ·
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    ABSTRACT: A donor–acceptor (D–A) semiconducting copolymer, PDPP-TVT-29, comprising a diketopyrrolopyrrole (DPP) derivative with long, linear, space-separated alkyl side-chains and thiophene vinylene thiophene (TVT) for organic field-effect transistors (OFETs) can form highly π-conjugated structures with an edge-on molecular orientation in an as-spun film. In particular, the layer-like conjugated film morphologies can be developed via short-term thermal annealing above 150 °C for 10 min. The strong intermolecular interaction, originating from the fused DPP and D–A interaction, leads to the spontaneous self-assembly of polymer chains within close proximity (with π-overlap distance of 3.55 Å) and forms unexpectedly long-range π-conjugation, which is favorable for both intra- and intermolecular charge transport. Unlike intergranular nanorods in the as-spun film, well-conjugated layers in the 200 °C-annealed film can yield more efficient charge-transport pathways. The granular morphology of the as-spun PDPP-TVT-29 film produces a field-effect mobility (μ FET) of 1.39 cm2 V−1 s−1 in an OFET based on a polymer-treated SiO2 dielectric, while the 27-Å-step layered morphology in the 200 °C-annealed films shows high μ FET values of up to 3.7 cm2 V−1 s−1.
    Advanced Functional Materials 05/2015; 25(25). DOI:10.1002/adfm.201403497 · 11.81 Impact Factor

  • Cancer Research 05/2015; 75(9 Supplement):P6-08-33-P6-08-33. DOI:10.1158/1538-7445.SABCS14-P6-08-33 · 9.33 Impact Factor
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    ABSTRACT: This study assessed the relationship between thyroid-stimulating hormone (TSH) level and risk of depressive symptom in a population with no clinical or laboratory evidence of thyroid dysfunction. This retrospective cohort study included 13,017 subjects (7913 males and 5104 females), 17-84 years of age, who underwent health examinations at the hospital. Subjects had a Beck Depression Inventory (BDI) total score of ≤9 and fell within the normal range of free T4 levels at baseline. The association between gender-specific serum TSH tertile at baseline and the development of clinically significant depressive symptom (i.e., ≥19 BDI total score) on the follow-up visit was evaluated using the Cox proportional hazards model, with adjustment for demographic and life style factors. The risk of depressive symptom was increased among subjects with the highest tertile TSH level (adjusted hazard ratio [HR], 2.236; 95% confidence interval [CI], 1.443-3.466; p<0.001) as compared with subjects with the lowest tertile in females, but not in males. Even among patients with normal TSH levels, females in the lowest-normal TSH tertile had a higher risk of depressive symptoms (adjusted HR, 2.279; 95% CI, 1.456-3.567; p<0.001) than did those in the highest tertile. The TSH level as a continuous variable significantly predicted the depressive symptoms in females (adjusted HR, 1.402; 95% CI, 1.002-1.812; p=0.027). Our finding suggests that suboptimal thyroid function increases vulnerability to the occurrence of depressive symptom and represents a modifiable risk factor for depression in females. Copyright © 2015 Elsevier Ltd. All rights reserved.
    Psychoneuroendocrinology 04/2015; 58:114-119. DOI:10.1016/j.psyneuen.2015.04.016 · 4.94 Impact Factor
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    ABSTRACT: Hypermethylation of the CpG island of p16 (INK4a) occurs in a significant proportion of colorectal cancer (CRC). We aimed to investigate its predictive role in CRC patients treated with 5-fluorouracil, leucovorin, irinotecan (FOLFIRI), and cetuximab. Pyrosequencing was used to identify KRAS mutation and hypermethylation of 6 CpG island loci (p16, p14, MINT1, MINT2, MINT31, and hMLH1) in DNA extracted from formalin-fixed paraffin-embedded specimens. Logistic regression and Cox regression were performed for analysis of the relation between methylation status of CIMP markers including p16 and clinical outcome. Hypermethylation of the p16 gene was detected in 14 of 49 patients (28.6%) and showed significant association with KRAS mutation (Fisher`s exact, P=0.01) and CIMP positivity (Fisher`s exact, P=0.002). Patients with p16-unmethylated tumors had significantly longer time to progression (TTP, median 9.0 vs 3.5 months; log-rank, P=0.001) and overall survival (OS, median 44.9 vs 16.4 months; log-rank, P=0.008) than those with p16-methylated tumors. Patients with both KRAS and p16 aberrancy (n=6) had markedly shortened TTP (median 2.8 months) compared to those with either KRAS or p16 aberrancy (n=11; median 8.6 months, P=0.021) or those with neither (n=32; median 9.0 months, P <0.0001). In multivariate analysis, KRAS mutation and p16 methylation showed independent association with shorter TTP (KRAS mutation HR=3.21, P=0.017; p16 methylation HR=2.97, P=0.027). Hypermethylation of p16 was predictive of clinical outcome in mCRC patients treated with cetuximab and FOLFIRI, irrespective of KRAS mutation.
    Cancer Research and Treatment 04/2015; DOI:10.4143/crt.2014.314 · 3.32 Impact Factor
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    ABSTRACT: The aim of this study was to evaluate the outcomes and patterns of recurrence in the different subtypes of breast cancer. We analyzed 1432 stage I-III breast cancer patients who had undergone surgery at Seoul National University Bundang Hospital between June 2003 and August 2011. Five subtypes were defined according to estrogen receptor, progesterone receptor, human epidermal growth factor receptor 2 (HER2), and Ki-67. Overall survival (OS) and breast cancer-free interval (BCFI) rates were estimated using the Kaplan-Meier method. Site-specific recurrence was estimated using Gray's test. The median follow-up period was 53 months. There were 22 local recurrences, 18 cases of contralateral breast cancer, 19 regional nodal recurrences, and 70 distant metastases. The 5-year BCFIs by subtype were luminal B-HER2 (+), 94.2 %; luminal A, 93.9 %; luminal B-HER2 (-), 91.4 %; HER2, 83.1 %; and triple-negative, 81.9 % (p < 0.001). Cases with the luminal A had a 5-year OS rate of 98.3 % that was the longest compared to those of cases with luminal B-HER2 (-), 95.8 %; luminal B-HER2 (+), 98.0 %; HER2, 90.8 %; and triple-negative, 89.9 % (p < 0.001). The triple-negative had a higher rate of local recurrence at the first site than others (p = 0.013). HER2 and triple-negative had higher rates of nodal recurrence at the first site than others (p < 0.001). The outcomes and patterns of site-specific recurrence in Korean breast cancer patients were different for each subtype. Defining recurrence patterns by breast cancer subtypes can help determine the appropriate method of surveillance and treatment.
    Breast Cancer Research and Treatment 04/2015; 151(1). DOI:10.1007/s10549-015-3390-7 · 3.94 Impact Factor
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    ABSTRACT: Charge traps in polymer gate dielectrics determine the electrical stability of organic field-effect transistors (OFETs) and polar alkoxy groups are well-known extrinsic charge traps. However, the actual location of intrinsic charge traps in nonpolar polymer gate dielectrics has been poorly understood yet. Here, we demonstrate that the skeletal structure of polymer chain plays an important role determining the electrical stability. To verify it, we prepared linear and branched polystyrene (l-PS and b-PS), and blended them, in which branched segments provide much larger free volume than the other segments. The current-insulating performance and field-effect mobility increased with decease of b-PS portion. In particular, the bias-stress stability was remarkably varied according to the change of b-PS portion even though all measurements excluded reactive components such as oxygen and water; the increase of b-PS resulted in time-dependent decay of mobility and threshold voltage under bias stress. This indicates that the branched segments in b-PS provides intrinsic and metastable charge trap sites. Our result suggests that the skeletal structure of polymeric chains in gate dielectric is one of the important factors affecting intrinsic long-term operational stability of OFET devices.
    The Journal of Physical Chemistry C 04/2015; 119(14):7670-7677. DOI:10.1021/acs.jpcc.5b01522 · 4.77 Impact Factor
  • Chan Yeong Jung · Se Hyun Kim · Hogyoung Kim ·
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    ABSTRACT: Using current-voltage (I-V) measurements, we investigated the effect of oxygen plasma treatment on the electrical properties of Cu/n-type Ge Schottky contacts. Compared to untreated n-Ge, oxygen plasma was found to produce a higher (lower) barrier height and a lower (higher) ideality factor at a plasma power of 100 W (250 W). Compared to untreated n-Ge, the series resistance was decreased at low plasma power and increased at high plasma power, which was associated with the removal of the native oxide layer and the induced defects near the Ge surface, respectively. The smaller variations in the electrical parameters for oxygen-plasma-treated n-Ge suggest that oxygen-plasma treatment improved the homogeneity of the Schottky barrier’s interface. Our results suggest that optimized oxygen plasma can be used as a pretreatment method before depositing a thin insulating layer.
    Journal- Korean Physical Society 04/2015; 66(8):1285-1290. DOI:10.3938/jkps.66.1285 · 0.42 Impact Factor
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    ABSTRACT: To measure the prognostic significance of absolute monocyte count/absolute lymphocyte count prognostic score (AMLPS) in patients with gastric cancer. We retrospectively examined the combination of absolute monocyte count (AMC) and absolute lymphocyte count (ALC) as prognostic variables in a cohort of 299 gastric cancer patients who underwent surgical resection between 2006 and 2013 and were followed at a single institution. Both AMC and ALC were dichotomized into two groups using cut-off points determined by receiving operator characteristic curve analysis. An AMLPS was generated, which stratified patients into three risk groups: low risk (both low AMC and high ALC), intermediate risk (either high AMC or low ALC), and high risk (both high AMC and low ALC). The primary objective of the study was to validate the impact of AMLPS on both disease-free survival (DFS) and overall survival (OS), and the second objective was to assess the AMLPS as an independent prognostic factor for survival in comparison with known prognostic factors. Using data from the entire cohort, the most discriminative cut-off values of AMC and ALC selected on the receiver operating characteristic curve were 672.4/μL and 1734/μL for DFS and OS. AMLPS risk groups included 158 (52.8%) patients in the low-risk, 128 (42.8%) in the intermediate-risk, and 13 (4.3%) in the high-risk group. With a median follow-up of 37.2 mo (range: 1.7-91.4 mo), five-year DFS rates in the low-, intermediate-, and high-risk groups were 83.4%, 78.7%, and 19.8%, respectively. And five-year OS rates in the low-, intermediate-, and high-risk groups were 89.3%, 81.1%, and 14.4%, respectively. On multivariate analysis performed with patient- and tumor-related factors, we identified AMLPS, age, and pathologic tumor-node-metastasis stage as the most valuable prognostic factors impacting DFS and OS. AMLPS identified patients with a poor DFS and OS, and it was independent of age, pathologic stage, and various inflammatory markers.
    03/2015; 21(9):2668-76. DOI:10.3748/wjg.v21.i9.2668
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    ABSTRACT: Organic field-effect transistors (OFETs) were fabricated using polymer blended gate dielectrics in an effort to enhance the electrical stability against a gate bias stress. A poly(melamine-co-formaldehyde) acrylated (PMFA) gate dielectric layer with great insulating properties was blended with polypentafluorostyrene (PFS), a type of hydrophobic fluorinated polymer. Although the overall electrical performance dropped slightly due to the rough and hydrophobic surfaces of the blend films, at the blend ratio (10%), the OFET’s threshold voltage shift under a sustained gate bias stress applied over 3 h decreased remarkably compared with an OFET based on a PMFA dielectric alone. This behavior was attributed to the presence of the hydrophobic and electrically stable PFS polymer, which provided a low interfacial trap density between the gate dielectric and the semiconductor. A stretched exponential function model suggested that the energetic barrier to create trap states was high, and the distribution of energetic barrier heights was narrow in devices prepared with PFS.
    Organic Electronics 03/2015; 21. DOI:10.1016/j.orgel.2015.03.005 · 3.83 Impact Factor
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    ABSTRACT: We investigated the effects of the solvent boiling point on organic field-effect transistor (OFET) device performances in devices prepared using two newly synthesized anthradithiophene derivatives: 9,10-di(4'-pentylphenylethynyl)-anthra[2,3-b:6,7-b']dithiophene (DPPEADT) and 9,10-bi([9',9'-dimethyl-fluoren-2-ylethynyl])-anthra[2,3-b:6,7-b']dithiophene (DFEADT). DPPEADT exhibited a distinct crystalline morphology whereas DFEADT was amorphous. We characterized the relationship between the molecular structures, film morphologies, and OFET device performances in devices prepared using solvents having one of three different boiling points (chlorobenzene, 1,2-dichlorobenzene, and 1,2,4-trichlorobenzene). 1,2,4-Trichlorobenzene, which provided the highest boiling point among the solvents tested and acted as a good solvent for DPPEADT, significantly improved the field-effect mobilities of DPPEADT devices up to 0.16 cm(2)/V by enhancing the crystallinity of the film. OFETs based on amorphous DFEADT films prepared using the three solvents did not provide enhanced electrical performances. The differences between the transistor performances were attributed to the degree of pi-overlap, the molecular structures, and the morphological properties of the films.
    Dyes and Pigments 03/2015; 114:60-68. DOI:10.1016/j.dyepig.2014.10.027 · 3.97 Impact Factor

Publication Stats

2k Citations
822.51 Total Impact Points


  • 2014-2015
    • Dongguk University
      Sŏul, Seoul, South Korea
    • Seoul National University of Science and Technology
      Sŏul, Seoul, South Korea
  • 2013-2015
    • Yeungnam University
      • Department of Nano, Medical and Polymer Materials
      Gyeongsan, Gyeongsangbuk-do, South Korea
    • University of Minnesota Duluth
      • Department of Chemistry and Biochemistry
      Duluth, Minnesota, United States
  • 2009-2015
    • Kyung Hee University
      • Graduate School of East-West Medical Science
      Sŏul, Seoul, South Korea
    • Seoul National University Bundang Hospital
      • Department of Neuropsychiatry
      Sŏul, Seoul, South Korea
  • 2006-2014
    • Seoul National University
      • • Medical Research Center
      • • Department of Biochemistry and Molecular Biology
      Sŏul, Seoul, South Korea
  • 2007-2013
    • Yonsei University
      • • Department of Internal Medicine
      • • Division of Medical Oncology
      Sŏul, Seoul, South Korea
  • 2006-2013
    • Pohang University of Science and Technology
      • Department of Chemical Engineering
      Antō, North Gyeongsang, South Korea
    • Seoul National University Hospital
      • Department of Neuropsychiatry
      Sŏul, Seoul, South Korea
  • 2007-2012
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2003
    • CHA University
      • College of Medicine
      Sŏul, Seoul, South Korea