Jin Young Kim

Eulji University, Daiden, Daejeon, South Korea

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Publications (423)1188.49 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: In mammals, circadian rhythms are generated at least in part by a cell-autonomous transcriptional feedback loop in which the three PERIOD (PER) and two CRYPTOCHROME (CRY) proteins inhibit the activity of the dimeric transcription factor CLOCK-BMAL1, thereby repressing their own expression. Upon nuclear entry, the PER and CRY proteins form a large protein complex (PER complex) that carries out circadian negative feedback by means of at least two basic functions: (1) it brings together multiple effector proteins that repress transcription and (2) it delivers these repressive effectors directly to CLOCK-BMAL1 bound to E-box sequences of circadian target genes. At present, the composition, mechanisms of action, and dynamics of PER complexes in circadian clock negative feedback are incompletely understood. Here, we describe several experimental approaches to the study of PER complexes obtained from mammalian tissues. We focus on the isolation of nuclei from mouse tissues, the extraction of PER complexes from the isolated nuclei, characterization of native PER complexes by gel filtration and blue native polyacrylamide gel electrophoresis, preparative immunoaffinity purification of PER complexes for mass spectrometric identification of constituent proteins, and chromatin immunoprecipitation to monitor the recruitment of PER complex proteins to CLOCK-BMAL1 at E-box sites of clock-regulated genes. © 2015 Elsevier Inc. All rights reserved.
    Methods in enzymology 12/2015; 551:197-210. DOI:10.1016/bs.mie.2014.10.013 · 2.09 Impact Factor
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    Kai Zhu · Tsutomu Miyasaka · Jin Young Kim · Iván Mora-Seró
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    ABSTRACT: Helicobacter pylori causes gastrointestinal diseases, including gastric cancer. Its high motility in the viscous gastric mucosa facilitates colonization of the human stomach, and depends on the helical cell shape and the flagella. In H. pylori, Csd6 is one of the cell shape-determining proteins that play key roles in alteration of cross-linking or by trimming of peptidoglycan muropeptides. Csd6 is also involved in deglycosylation of the flagellar protein FlaA. To better understand its function, biochemical, biophysical, and structural characterizations were carried out. We show that Csd6 has a three-domain architecture and exists as a dimer in solution. The N-terminal domain plays a key role in dimerization. The middle catalytic domain resembles those of L,D-transpeptidases but its pocket-shaped active-site is uniquely defined by the four loops I-IV, among which loops I and III show the most distinct variations from the known L,D-transpeptidases. Mass analyses confirm that Csd6 functions only as L,D-carboxypeptidase but not as L,D-transpeptidase. The D-Ala-complexed structure suggests possible binding modes of both the substrate and product to the catalytic domain. The C-terminal nuclear transport factor 2-like domain possesses a deep pocket for possible binding of pseudaminic acid and in silico docking supports its role in deglycosylation of flagellin. On the basis of these findings, it is proposed that H. pylori Csd6 and its homologs constitute a new family of L,D-carboxypeptidase. This work provides insights into the function of Csd6 in regulating the helical cell shape and motility of H. pylori. Copyright © 2015, The American Society for Biochemistry and Molecular Biology.
    Journal of Biological Chemistry 08/2015; DOI:10.1074/jbc.M115.658781 · 4.57 Impact Factor
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    Jin Young Kim · Kun Cho · Seul-A Ryu · So Youn Kim · Byung Mook Weon
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    ABSTRACT: Crack formation is a frequent result of residual stress release from colloidal films made by the evaporation of colloidal droplets containing nanoparticles. Crack prevention is a significant task in industrial applications such as painting and inkjet printing with colloidal nanoparticles. Here, we illustrate how colloidal drops evaporate and how crack generation is dependent on the particle size and initial volume fraction, through direct visualization of the individual colloids with confocal laser microscopy. To prevent crack formation, we suggest use of a versatile method to control the colloid-polymer interactions by mixing a nonadsorbing polymer with the colloidal suspension, which is known to drive gelation of the particles with short-range attraction. Gelation-driven crack prevention is a feasible and simple method to obtain crack-free, uniform coatings through drying-mediated assembly of colloidal nanoparticles.
    Scientific Reports 08/2015; 5:13166. DOI:10.1038/srep13166 · 5.58 Impact Factor
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    ABSTRACT: Polysulfone-based membranes with pyridine (PY) side chains, crosslinked by imidazole (IM) groups, are synthesised, doped with phosphoric acid (PA) and characterised in the hydrogen/air fuel cell at 160 °C. It is shown that the bisphenol A (BPA) group of Udel P-3500 (Solvay) acts as a breaking point, and Radel R-5000 NT (Solvay)-based membranes, in which BPA is substituted for biphenyl, show superior stability. Undoped membranes show thermal stability of up to 330 °C (3% weight loss, 10 °C/min, nitrogen). PA-doped membranes: The weight gain during acid doping is limited by the high crosslink density, and independent of the doping temperature. By varying the ratio of pyridine to imidazole units from 2:1 to 9:1, the PA uptake can be controlled between 200 and 500 wt%, respectively. The Young modulus increases with the crosslinking density from 12 to 129 MPa. Proton conductivity of the PY/IM 2:1 membrane at 160 °C reaches 59 mS/cm. In the fuel cell, the PY/IM 2:1 membrane achieved a potential of ca. 500 mV at 0.2 A/cm2. After 430 h (330 h at 0.2 A/cm2, then 0.4 A/cm2), the cell failed, and postmortem analysis suggested severe chemical degradation. Washing the membrane with ammonia solution before doping increased the stability further.
    Solid State Ionics 07/2015; 275. DOI:10.1016/j.ssi.2015.03.026 · 2.56 Impact Factor
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    ABSTRACT: Cerebral white matter hyperintensities (WMH) are prevalent incident findings on brain MRI scans among elderly people and have been consistently implicated in cognitive dysfunction. However, differential roles of WMH by region in cognitive function are still unclear. The aim of this study was to ascertain the differential role of regional WMH in predicting progression from mild cognitive impairment (MCI) to different subtypes of dementia. Participants were recruited from the Clinical Research Center for Dementia of South Korea (CREDOS) study. A total of 622 participants with MCI diagnoses at baseline and follow-up evaluations were included for the analysis. Initial MRI scans were rated for WMH on a visual rating scale developed for the CREDOS. Differential effects of regional WMH in predicting incident dementia were evaluated using the Cox proportional hazards model. Of the 622 participants with MCI at baseline, 139 patients (22.3%) converted to all-cause dementia over a median of 14.3 (range 6.0-36.5) months. Severe periventricular WMH (PWMH) predicted incident all-cause dementia (Hazard ratio (HR) 2.22; 95% confidence interval (CI) 1.43-3.43) and Alzheimer's disease (AD) (HR 1.86; 95% CI 1.12-3.07). Subcortical vascular dementia (SVD) was predicted by both PWMH (HR 16.14; 95% CI 1.97-132.06) and DWMH (HR 8.77; 95% CI 1.77-43.49) in more severe form (≥ 10 mm). WMH differentially predict dementia by region and severity. Our findings suggest that PWMH may play an independent role in the pathogenesis of dementia, especially in AD.
    International Psychogeriatrics 07/2015; -1:1-9. DOI:10.1017/S1041610215001076 · 1.93 Impact Factor
  • Garam Kim · Jin Young Kim · Hong Seok Choi
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    ABSTRACT: Phosphorylation of proteins on serine or threonine residues preceding proline is a pivotal signaling mechanism regulating cell proliferation. The recent identification and characterization of the enzyme peptidyl-prolyl cis/trans isomerase never in mitosis A (NIMA)-interacting 1 (PIN1) has led to the discovery of a new mechanism regulating phosphorylation in cell signaling. PIN1 specifically binds phosphorylated serine or threonine residues immediately preceding proline (pSer/Thr-Pro) and then regulates protein functions, including catalytic activity, phosphorylation status, protein interactions, subcellular location, and protein stability, by promoting cis/trans isomerization of the peptide bond. Recent results have indicated that such conformational changes following phosphorylation represent a novel signaling mechanism in the regulation of many cellular functions. Understanding this mechanism also provides new insight into the pathogenesis and treatment of human hepatocellular carcinoma. A better understanding of the role of PIN1 in the pathogenesis of hepatocellular carcinoma may lead to the identification of molecular targets for prevention and therapeutic intervention.
    Biological & Pharmaceutical Bulletin 07/2015; 38(7):975-9. DOI:10.1248/bpb.b15-00245 · 1.83 Impact Factor
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    ABSTRACT: Abstract Hydrogen production via steam reforming of a simulated biogas was achieved in a temperature range of 500-800 °C over a plate-type Ni-Al catalyst. To enhance the catalytic activity of the Ni-Al catalyst, a pretreatment process involving pre-oxidation with sequential reduction was employed prior to the reforming reactions. The activated Ni-Al catalyst exhibited increased methane conversion depending on the pre-oxidation temperature. Studies using X-ray diffraction and scanning electron microscopy suggested that the catalyst surface was restructured upon pretreatment, ultimately improving the catalytic activity. To increase its catalytic stability, CeO2 was employed additionally as a structural promoter to prevent both Ni sintering and carbon deposition. The durability of the CeO2-coated Ni-Al catalyst was improved significantly, particularly upon addition of ≥2.8 wt% of CeO2, with ca. 75 % of CH4 conversions being achieved without deactivation over 100 h at 700 °C. The influence of the pre-oxidation temperature, reforming temperature, and steam/CH4 ratio on reforming over a CeO2-Ni-Al catalyst was also elucidated. In addition, the potential roles of CeO2 in the enhancement of activity and stability were discussed. Graphical Abstract
    Catalysis Letters 07/2015; 145(7). DOI:10.1007/s10562-015-1532-5 · 2.31 Impact Factor
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    Jang Hyun Lee · Jin Young Kim · Chul Han Kim
    Yonsei medical journal 07/2015; 56(4):1167-1169. DOI:10.3349/ymj.2015.56.4.1167 · 1.29 Impact Factor
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    Seon Woong Kong · Yeon Woo Jeong · Jin Young Kim
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    ABSTRACT: [Purpose] The purpose of this study was to investigate the correlations of balance and gait according to pelvic displacement in stroke patients. [Subjects] The subjects of this study were 58 stroke patients who had been admitted to a hospital. [Methods] A Global Postural System was used to measure pelvic displacement. To measure the balance ability, a Tetrax balance system was used to measure the weight distribution index and stability index. Gait ability was measured during the 10-Meter Walking Test and Figure-of-8 Walk Test. [Results] The results of this study showed that was significant positive correlation between the anterior superior iliac spine height difference in pelvic displacement and the weight distribution index and significant positive correlation between the posterior superior iliac spine height difference and the stability index in the normal position with the eyes closed. Statistically significant positive correlation also was found between the anterior superior iliac spine height difference and the straight and curved gait ability. [Conclusion] The increased pelvic displacement in stroke patients results in a decrease in balance ability and gait speed. This suggests that control of pelvic displacement is necessary before functional training for patients with stroke.
    Journal of Physical Therapy Science 07/2015; 27(7):2171-4. DOI:10.1589/jpts.27.2171 · 0.39 Impact Factor
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    Kai Zhu · Tsutomu Miyasaka · Jin Young Kim · Iván Mora-Seró
    Journal of Physical Chemistry Letters 06/2015; 6(12):2315-2317. DOI:10.1021/acs.jpclett.5b01033 · 7.46 Impact Factor
  • Chung Suk Lee · Jin Young Kim · Joonhee Kang
    05/2015; 24(3):169-174. DOI:10.5369/JSST.2015.24.3.169
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    ABSTRACT: Exfoliated graphitic carbon nitride nanosheets (g-C3N4-NS) were applied for the first time to the preparation of an electrocatalyst for the oxygen reduction reaction (ORR). A less dense structure with increased surface area was observed for g-C3N4-NS compared to bulk g-C3N4 from detailed analyses including TEM, STEM, AFM with depth profiling, XRD, and UV-Vis spectroscopy. The pyrolysis of the prepared g-C3N4-NS with Co and carbon under inert environment provided enhanced accessibility to the N functionalities required for efficient interaction of Co and C with N for the formation of Co-N-C networks and produced hollow and interconnected Co-N-C-NS structure responsible for high durability. The Co-N-C-NS electrocatalyst exhibited superior catalytic activity and durability and further displayed fast and selective four electron transfer kinetics for the ORR, as evidenced by various electrochemical experiments. The hollow, interconnected structure of Co-N-C-NS with increased pyridinic and graphitic N species was proposed to play a key role in facilitating the desired ORR reaction.
    Nanoscale 05/2015; 7(23). DOI:10.1039/C5NR01584G · 7.39 Impact Factor
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    ABSTRACT: Optical-resolution photoacoustic microscopy (OR-PAM) is an imaging tool to provide in vivo optically sensitive images in biomedical research. To achieve a small size, fast imaging speed, wide scan range, and high signal-to-noise ratios (SNRs) in a water environment, we introduce a polydimethylsiloxane (PDMS)-based 2-axis scanner for a flexible and waterproof structure. The design, theoretical background, fabrication process and performance of the scanner are explained in details. The designed and fabricated scanner has dimensions of 15 × 15 × 15 mm along the X, Y and Z axes, respectively. The characteristics of the scanner are tested under DC and AC conditions. By pairing with electromagnetic forces, the maximum scanning angles in air and water are 18° and 13° along the X and Y axes, respectively. The measured resonance frequencies in air and water are 60 and 45 Hz along the X axis and 45 and 30 Hz along the Y axis, respectively. Finally, OR-PAM with high SNRs is demonstrated using the fabricated scanner, and the PA images of micro-patterned samples and microvasculatures of a mouse ear are successfully obtained with high-resolution and wide-field of view. OR-PAM equipped with the 2-axis PDMS based waterproof scanner has lateral and axial resolutions of 3.6 μm and 26 μm, respectively. This compact OR-PAM system could potentially and widely be used in preclinical and clinical applications.
    Sensors 05/2015; 15(5):9815-26. DOI:10.3390/s150509815 · 2.25 Impact Factor
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    Hyun Seung Song · Jin Young Kim
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    ABSTRACT: [Purpose] This study was to assessed the efficacy of a complex exercise program for the elderly, with respect to the effects on walking ability during direction change and on falls efficacy. [Subjects] In total, 40 subjects were selected for this study and assigned randomly to either a complex exercise (n = 20) or a general exercise (n = 20) group. [Methods] The complex exercise consisted of resistance and aerobic exercises. The exercise program was conducted three times a week for eight weeks. We assessed outcome measures of the four square step test, the figure-of-8 walk test, and the falls efficacy scale. [Results] After the intervention, the four step square test, figure-of-8 walk test, and falls efficacy scale values increased significantly in both the complex exercise program and general exercise groups. The complex exercise group showed a more significant improvement than the general exercise group in the figure-of-8 walk test step and falls efficacy scale scores. [Conclusion] Complex exercise improved walking ability during direction change and falls efficacy in elderly individuals.
    Journal of Physical Therapy Science 05/2015; 27(5):1365-1367. DOI:10.1589/jpts.27.1365 · 0.39 Impact Factor
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    ABSTRACT: We report a case of agranulocytosis caused by ethambutol in a 79-year-old man with pulmonary tuberculosis. He was referred for fever and skin rash developed on 21th day after antituberculosis drugs (isoniazid, rifampicin, ethambutol, and pyrazinamide) intake. Complete blood count at the time of diagnosis of pulmonary tuberculosis was normal. On the seventh admission day, agranulocytosis was developed with absolute neutrophil count of 70/µL. We discontinued all antituberculosis drugs, and then treated with granulocyte colony-stimulating factor. Three days later, the number of white blood cell returned to normal. We administered isoniazid, pyrazinamide, and ethambutol in order with an interval. However, fever and skin rash developed again when adding ethambutol, so we discontinued ethambutol. After these symptoms disappeared, we added rifampicin and ethambutol in order with an interval. However after administering ethambutol, neutropenia developed, so we discontinued ethambutol again. He was cured with isoniazid, rifampicin, and pyrazinamide for 9 months.
    Tuberculosis and Respiratory Diseases 04/2015; 78(2):125-127. DOI:10.4046/trd.2015.78.2.125
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    Ngoc Nam Bui · Thuong Khanh Tran · So Hee Min · Jin Young Kim
    03/2015; 13(3). DOI:10.14801/jkiit.2015.13.3.53
  • Jin Young Kim · Hyo Jung Moon · Du Young Ko · Byeongmoon Jeong
    03/2015; 2(1):15-22. DOI:10.12989/bme.2015.2.1.015
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    ABSTRACT: Currently, most sulfonated poly(arylene ether sulfone) (s-PAES) polymers are synthesized using a solvent mixture consisting of toluene and dimethylacetamide (DMAc) by two successive reactions, namely azeotropic water removal, followed by nucleophilic substitution. In this study, a novel method for the synthesis of s-PAES polymers has been developed, where alcohols such as methanol, ethanol, or 2-propanol are used along with DMAc as the co-solvent in the place of toluene that is used in the conventional synthesis of s-PAES. Moreover, the synthesis method used in this study involves only one step, namely the polymerization at 160 °C and does not require the azeotropic water distillation step at 140 °C. The new synthesis method was found to yield s-PAES polymers with a higher molecular weight in a shorter reaction time compared to the conventional polymerization method. Further, membrane electrode assemblies (MEA) were fabricated using the synthesized s-PAES polymer membranes, in order to evaluate the performance of the membranes in polymer electrolyte membrane fuel cells (PEMFCs). The results indicate that the s-PAES membranes synthesized using the method proposed in this study have a great potential for use as PEMFC membranes.
    Solid State Ionics 03/2015; 275. DOI:10.1016/j.ssi.2015.03.001 · 2.56 Impact Factor
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    ABSTRACT: The purpose of this study is to evaluate the clinical usefulness of modulated arc (mARC) treatment techniques. The mARC treatment plans of the non-small cell lung cancer (NSCLC) patients were performed in order to verify the clinical usefulness of mARC. A pre study was conducted to find the most competent plan condition of mARC treatment and the usefulness of mARC treatment plan was evaluated by comparing it with the other Arc treatment plans such as Tomotherapy and RapidArc. In the case of mARC, the optimal condition for the mARC plan was determined by comparing the dosimetric performance of the mARC plans with the use of various parameters. The various parameters includes the photon energies (6 MV, 10 MV), optimization point angle (6{\deg}-10{\deg} intervals), and total segment number (36-59 segment). The best dosimetric performance of mARC was observed at 10 MV photon energy and the point angle 6 degree, and 59 segments. The each treatment plans of three different techniques were compared with the following parameters: conformity index (CI), homogeneity index (HI), target coverage, dose in the OARs, monitor units (MU), beam on time and the normal tissue complication probability (NTCP). As a result, all three different treatment techniques show the similar target coverage. The mARC results the lowest V20 and MU per fraction compared with both RapidArc and Tomotherapy plan. The mARC plan reduces the beam on time as well. Therefore, the results of this study provided a satisfactory result which mARC technique is considered as a useful clinical technique for radiation treatment.
    Journal- Korean Physical Society 03/2015; 67(1). DOI:10.3938/jkps.67.232 · 0.42 Impact Factor

Publication Stats

4k Citations
1,188.49 Total Impact Points


  • 2015
    • Eulji University
      • Department of Internal Medicine
      Daiden, Daejeon, South Korea
    • Samsung Medical Center
      • Department of Neurology
      Sŏul, Seoul, South Korea
  • 2014–2015
    • Soonchunhyang University
      • College of Medicine
      Onyang, Chungcheongnam-do, South Korea
    • Pukyong National University
      Tsau-liang-hai, Busan, South Korea
    • Ulsan National Institute of Science and Technology
      Urusan, Ulsan, South Korea
    • Case Western Reserve University School of Medicine
      • Department of Urology
      Cleveland, Ohio, United States
    • Seoul National University Hospital
      Sŏul, Seoul, South Korea
    • Gyeongsang National University
      • Department of Otolaryngology
      Shinshū, Gyeongsangnam-do, South Korea
  • 2013–2015
    • Harvard Medical School
      • Department of Neurobiology
      Boston, Massachusetts, United States
    • Korea University
      Sŏul, Seoul, South Korea
    • Temple University
      • Department of Anatomy and Cell Biology
      Philadelphia, Pennsylvania, United States
    • Inje University Paik Hospital
      Sŏul, Seoul, South Korea
    • NASA
      Вашингтон, West Virginia, United States
    • Korea Aerospace University
      • School of Aerospace and Mechanical Engineering
      Kōyō, Gyeonggi Province, South Korea
    • University of Toronto
      • Department of Electrical and Computer Engineering
      Toronto, Ontario, Canada
  • 2010–2015
    • Pohang University of Science and Technology
      • • Department of Mechanical Engineering
      • • Department of Materials Science and Engineering
      Geijitsu, Gyeongsangbuk-do, South Korea
    • Icahn School of Medicine at Mount Sinai
      Borough of Manhattan, New York, United States
    • National Fisheries Research and Development Institution
      Sŏul, Seoul, South Korea
    • Robert Wood Johnson University Hospital
      New Brunswick, New Jersey, United States
  • 2009–2015
    • Chosun University
      • • Department of Medicine
      • • College of Pharmacy
      • • Department of Pharmacy
      Gwangju, Gwangju, South Korea
    • National Cancer Center Korea
      • Lung Cancer Branch
      Kōyō, Gyeonggi-do, South Korea
    • Robert Wood, Johnson University Hospital At Hamilton
      New Jersey, United States
    • Hallym University Medical Center
      • Department of Ophthalmology
      Sŏul, Seoul, South Korea
  • 2002–2015
    • Chonnam National University
      • Department of Electrical, Electronic Communication and Computer Engineering
      Gwangju, Gwangju, South Korea
  • 2000–2015
    • Korea Basic Science Institute KBSI
      • Division of Mass Spectrometry Research
      Sŏul, Seoul, South Korea
    • Korea Institute of Science and Technology
      • Fuel Cell Research Center
      Sŏul, Seoul, South Korea
  • 2010–2014
    • Keimyung University
      • Dongsan Medical Center
      Sŏul, Seoul, South Korea
    • Dongguk University
      • Department of Pathology
      Sŏul, Seoul, South Korea
  • 2005–2014
    • Ewha Womans University
      • • Department of Chemistry Nano Science
      • • Department of Preventive Medicine
      • • Division of Nursing Science
      Sŏul, Seoul, South Korea
    • Nagaoka University of Technology
      • Department of Chemistry
      Нагаока, Niigata, Japan
  • 2004–2014
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • Yonsei University
      • • Department of Otorhinolaryngology
      • • Department of Materials Science and Engineering
      • • Department of Internal Medicine
      • • Institute of Gastroenterology
      Sŏul, Seoul, South Korea
  • 2003–2014
    • Pusan National University
      • • Department of Nanomaterials Engineering
      • • Department of Physics
      Busan, Busan, South Korea
  • 2001–2014
    • Kwangwoon University
      • • Department Electronics Convergence Engineering
      • • Department of Electronic Material Engineering
      • • Department of Radio Sciences & Engineering
      • • Department of Electrical Engineering
      Sŏul, Seoul, South Korea
  • 1999–2014
    • Kunsan National University
      • Department of Physics
      Gunzan, Jeollabuk-do, South Korea
  • 1991–2014
    • Seoul National University
      • • Department of Ophthalmology
      • • Department of Biological Sciences
      • • College of Medicine
      • • College of Pharmacy
      • • Department of Materials Science and Engineering
      • • Department of Electrical and Computer Engineering
      Sŏul, Seoul, South Korea
  • 2011–2013
    • Hyundai Heavy Industries
      Urusan, Ulsan, South Korea
    • University of Texas at Austin
      • Department of Civil, Architectural & Environmental Engineering
      Austin, Texas, United States
  • 2010–2013
    • Kwandong University
      • College of Medicine
      Gangneung, Gangwon, South Korea
  • 2012
    • University of Massachusetts Amherst
      • School of Computer Science
      Amherst Center, Massachusetts, United States
    • University of Incheon
      • Department of Physics
      Sŏul, Seoul, South Korea
  • 2009–2012
    • Kyung Hee University
      • Department of Medicine
      Sŏul, Seoul, South Korea
  • 2008–2012
    • Jeju National University
      • Faculty of Biotechnology
      Tse-tsiu, Jeju, South Korea
    • Sogang University
      • Department of Computer Science and Engineering
      Sŏul, Seoul, South Korea
  • 2004–2012
    • Sungkyunkwan University
      Sŏul, Seoul, South Korea
  • 2010–2011
    • Chungnam National University
      • College of Pharmacy
      Sŏngnam, Gyeonggi Province, South Korea
  • 2009–2011
    • National Institutes of Health
      • Laboratory of Cancer Prevention
      Maryland, United States
  • 2008–2011
    • Massachusetts Institute of Technology
      • Department of Materials Science and Engineering
      Cambridge, MA, United States
    • National Renewable Energy Laboratory
      گلدن، کلرادو, Colorado, United States
  • 2008–2009
    • The Scripps Research Institute
      • Department of Chemical Physiology
      La Jolla, California, United States
    • Chung-Ang University
      • • College of Pharmacy
      • • College of Medicine
      Sŏul, Seoul, South Korea
  • 2003–2009
    • Catholic University of Korea
      • • Department of Internal Medicine
      • • Department of Anatomy
      • • College of Medicine
      • • Department of Microbiology
      Sŏul, Seoul, South Korea
  • 2007
    • University of California, Santa Barbara
      • Center for Polymers and Organic Solids
      Santa Barbara, CA, United States
  • 2006
    • Asan Medical Center
      • Department of Oncology
      Sŏul, Seoul, South Korea
  • 2004–2006
    • University of California, Davis
      • • Department of Chemistry
      • • Department of Physics
      Davis, California, United States
  • 2003–2006
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi Province, South Korea
  • 2002–2003
    • Catholic University of Daegu
      • Department of Radiology
      Kayō, Gyeongsangbuk-do, South Korea
  • 2001–2003
    • Korea Advanced Institute of Science and Technology
      • Department of Materials Science and Engineering
      Sŏul, Seoul, South Korea
  • 1998–2000
    • Princeton University
      • Department of Electrical Engineering
      Princeton, New Jersey, United States
    • Hyundai Engineering Co., Ltd.
      Sŏul, Seoul, South Korea
  • 1995–1998
    • Dongseo University
      Tsau-liang-hai, Busan, South Korea