Jin Young Kim

National Cancer Center Korea, Kōyō, Gyeonggi Province, South Korea

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Publications (317)797.7 Total impact

  • Article: Erratum.
    Jin Young Kim
    Journal of analytical toxicology 07/2014; 38(6):385. · 2.11 Impact Factor
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    ABSTRACT: MEMS gyroscopes have favorable characteristics, including small size, high throughput, and low cost. The performance of MEMS gyroscopes depends on the displacement sensitivity of the capacitors. In this paper, we describe the fabrication of 300-?m-thick gyroscopes that can provide high displacement sensitivity and are robust to fabrication tolerances, i.e. deep reactive ion etch (DRIE) rate uniformity. When thick structures are perforated using DRIE to achieve high-aspect-ratio features, footing is commonly observed. However, we describe a fabrication method that circumvents problems associated with footing and side-wall etching, so that the gyroscopes can have uniform dimensions and small variations across the wafer. Using a post-fabrication translation approach, the position of capacitors is modified following DRIE, and the gap in the gyroscopes can be reduced to 3??m, which leads to an aspect ratio of 100. Using this method, we fabricated MEMS gyroscopes that can overcome the DRIE aspect ratio limit and have capacitors with higher sensitivities than those of other gyroscopes, which typically employ substrates that are less than 100??m thick. The gyroscope had a resonant frequency of 9.91?kHz, a quality factor of 2500 and a sensitivity of 23?mV/[deg/s].
    Journal of Micromechanics and Microengineering 06/2014; 24(7):075013. · 1.79 Impact Factor
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    ABSTRACT: The purpose of this study is to investigate that effect of action observation training (AOT) on knee joint function and balance in total knee replacement (TKR) patients. The subjects consisted of eighteen post-TKR patients. All participants underwent conventional physical therapy. In addition, patients in the AOT group (n= 9) were asked to observe video clips showing daily actions and to imitate them afterward. Patients in the control group (n= 9) were asked to execute the same actions as patients in the AOT group. Outcome measures Western Ontario and Mc-Master Universities Osteoarthritis Index (WOMAC) included pain, stiffness, function and Timed Up and Go (TUG) test. After intervention, patients in the AOT group score better than patients in the control group. After TUG test, patients in the AOT group and control group were no significant difference between two groups. In addition to conventional physical therapy, AOT is effective in the rehabilitation of post-TKR patients. Action observation training is considered conducive to improving knee functions and ameliorating pain and stiffness, of patients who underwent TKR.
    Journal of exercise rehabilitation. 06/2014; 10(3):168-71.
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    ABSTRACT: Document-level relevance judgments are a major component in the calculation of effectiveness metrics. Collecting high-quality judgments is therefore a critical step in information retrieval evaluation. However, the nature of and the assumptions underlying relevance judgment collection have not received much attention. In particular, relevance judgments are typically collected for each document in isolation, although users read each document in the context of other documents. In this work, we aim to investigate the nature of relevance judgment collection. We collect relevance labels in both isolated and conditional setting, and ask for judgments in various dimensions of relevance as well as overall relevance. Then we compare the relevance metrics based on various types of judgments with other metrics of quality such as user preference. Our analyses illuminate how these settings for judgment collection affect the quality and the characteristics of the judgments. We also find that the metrics based on conditional judgments show higher correlation with user preference than isolated judgments.
    Proceedings of the 23rd international conference on World wide web; 04/2014
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    ABSTRACT: Background/Aim: Clinical trials have shown efficacy of the anti-HER2 monoclonal antibody trastuzumab in metastatic breast cancer patients. The aim of the present study was to elucidate the mechanisms by which up-regulation of fatty acid synthase (FAS) expression confers resistance to trastuzumab in HER2-positive breast cancers. The expression of FAS as well as the cytotoxic effects of combinatorial treatment of trastuzumab and juglone was investigated by immunoblotting, BrdU incorporation, TUNEL assay, and soft agar assay. Pin1 enhanced EGF-induced SREBP1c promoter activity, resulting in the induction of FAS expression in BT474 cells. In contrast, juglone, a potent Pin1 inhibitor, significantly enhanced trastuzumab-induced FAS down-regulation and cell death in BT474 cells. Furthermore, trastuzumab, when used in combination with gene silencing or chemical inhibition of Pin1, increased cleaved poly(ADP-ribose) polymerase and DNA fragmentation to increase trastuzumab sensitivity. Pin1-mediated FAS overexpression is a major regulator of trastuzumab-resistant breast cancer growth and survival.
    Anticancer research 03/2014; 34(3):1409-16. · 1.71 Impact Factor
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    ABSTRACT: Interleukin-22 (IL-22), one of the cytokines secreted by T helper 17 (Th17) cells, binds to a class II cytokine receptor containing an IL-22 receptor 1 (IL-22R1) and IL-10R2 and influences a variety of immune reactions. IL-22 has also been shown to modulate cell cycle and proliferation mediators such as extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK), but little is known about the underlying molecular mechanisms of IL-22 in tumorigenesis. In this paper, we propose that IL-22 has a crucial role to play in controlling epithelial cell proliferation and tumorigenesis in the breast. IL-22 increased MAP3K8 phosphorylation through IL-22R1, followed by the induction of MEK-ERK, JNK-c-Jun, and STAT3 signaling pathways. Furthermore, IL-22-IL-22R1 signaling pathway activated activator protein-1 (AP-1) and HER2 promoter activity. In addition, Pin1 was identified as a key positive regulator for the phosphorylation-dependent MEK, c-Jun, and STAT3 activity induced by IL-22. Pin1(-/-) mouse embryonic fibroblasts (MEF) exhibited significantly a decrease in IL-22-induced MEK1/2, c-Jun, and STAT3 phosphorylation compared to Pin1(+/+) MEF. In addition, a knockdown of Pin1 prevented phosphorylation induced by IL-22. The in vivo chorioallantoic membrane (CAM) assay also showed that IL-22 increased tumor formation of JB6 Cl41 cells. Moreover, the knockdown of MAP3K8 and Pin1 attenuated tumorigenicity of MCF7 cells. Consistent with these observations, IL-22 levels positively correlate with MAP3K8 and Pin1 expression in human breast cancer. Overall, our findings point to a critical role for the IL-22-induced MAP3K8 signaling pathway in promoting cancer-associated inflammation in the tumor microenvironment.
    Carcinogenesis 02/2014; · 5.64 Impact Factor
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    Jin Young Kim, Joonhee Kang
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    ABSTRACT: Recent development of ubiquitous technology prompted its application for the blinds. In this work, we developed an RFID goggle equipped with a voice guide for the blinds who have difficulties in obtaining medication informations. When a blind, wearing our RFID goggle, tags the RFID tag attached to a drug, the RFID goggle announces the already saved medication information. We used STM32 as MCU and MFRC523 for RFID chipset in the reader. Our miniaturized hardware supported ISO 14443A protocol, and the standardized conformance test was performed. When the blinds wear our RFID goggle, they can conveniently access to the medication informations, and thus the drug misuse cases may decrease.
    Journal of Sensor Science and Technology. 01/2014; 23(2).
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    ABSTRACT: Purpose To investigate the clinical utility of targeted next-generation sequencing (NGS) for predicting the responsiveness to epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitor (TKI) therapy, we compared the efficacy with conventional sequencing in never-smokers with lung adenocarcinoma (NSLAs). Patients and Methods We obtained DNA from 48 NSLAs who received gefitinib or erlotinib for their recurrent disease after surgery. Sanger sequencing and peptide nucleic acid clamp polymerase chain reaction (PCR) were used to analyze EGFR, KRAS, BRAF, and PIK3CA mutations. We analyzed ALK, RET, and ROS1 rearrangements by fluorescent in situ hybridization or reverse transcriptase-PCR and quantitative real-time PCR. After molecular screening, Ion Torrent NGS was performed in 31 cases harboring only EGFR exon 19 deletions (19DEL), an L858R mutation, or none of the above mutations. Results The 31 samples were divided into four groups: 1) responders to EGFR-TKIs with only 19DEL or L858R (n = 15); 2) primary resistance to EGFR-TKI with only 19DEL or L858R (n = 4); 3) primary resistance to EGFR-TKI without any mutations (n = 8); 4) responders to EGFR-TKI without any mutations (n = 4). With NGS, all conventionally detected mutations were confirmed except for one L858R in group 2. Additional uncovered predictive mutations with NGS included one PIK3CA E542 K in group 2, two KRAS (G12 V and G12D), one PIK3CA E542 K, one concomitant PIK3CA and EGFR L858R in group 3, and one EGFR 19DEL in group 4. Conclusions Targeted NGS provided a more accurate and clinically useful molecular classification of NSLAs. It may improve the efficacy of EGFR-TKI therapy in lung cancer.
    Lung Cancer. 01/2014;
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    ABSTRACT: A reversible, carbon dioxide mediated chemical hydrogen storage was first demonstrated using a heterogeneous Pd catalyst supported on mesoporous graphitic carbon nitride (Pd/mpg-C3N4). The Pd nanoparticles were found to be uniformly dispersed onto mpg-C3N4 with an average size of 1.7 nm without any agglomeration and further exhibit superior activity for the dehydrogenation of formic acid with a turnover frequency of 144 h-1 even in the absence of external bases at room temperature. Initial DFT studies suggest that basic sites located at the mpg-C3N4 support play synergetic roles in stabilizing reduced Pd nanoparticles without any surfactant as well as in initiating H2 -release by deprotonation of formic acid, and these potential interactions were further confirmed by X-ray absorption near edge structure (XANES). Along with dehydrogenation, Pd/mpg-C3N4 also proves to catalyze the regeneration of formic acid via CO2 hydrogenation. Governing factors on CO2 hydrogenation are further elucidated to increase the quantity of the desired formic acid with high selectivity.
    J. Mater. Chem. A. 01/2014;
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    ABSTRACT: We have incorporated silicon nanoparticles (Si-nps) into organic–inorganic hybrid solar cells in place of the chalcogenide nanocrystals that are commonly employed in such devices. Poly(3,4-ethylenedioxy-thiophene):poly(styrene sulfonate) (PEDOT:PSS) and phenyl-C61-butyric acid methyl ester (PCBM) were employed as hole and electron transport layers, respectively. We used transmission electron microscopy, Raman spectroscopy, and ultraviolet–visible spectroscopy to fully characterize the Si-nps and relate their characteristics to the performance of the hybrid solar cells. We show that the open circuit voltage (VOC) was largely dependent on the size and amorphous volume fraction of Si-nps. Our findings imply that the amorphous phase and small size of Si-nps produce band gap widening that increases the VOC when coupled with PCBM as acceptor. The maximum VOC was up to 0.634 V in a hybrid device with 5.7 nm Si-nps.
    Current Applied Physics 01/2014; 14(1):127–131. · 2.03 Impact Factor
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    ABSTRACT: We assessed the success rate of empirical antifungal therapy with itraconazole and evaluated risk factors for predicting the failure of empirical antifungal therapy. A multicenter, prospective, observational study was performed in patients with hematological malignancies who had neutropenic fever and received empirical antifungal therapy with itraconazole at 22 centers. A total of 391 patients who had abnormal findings on chest imaging tests (31.0%) or a positive result of enzyme immunoassay for serum galactomannan (17.6%) showed a 56.5% overall success rate. Positive galactomannan tests before the initiation of the empirical antifungal therapy (P=0.026, hazard ratio [HR], 2.28; 95% confidence interval [CI], 1.10-4.69) and abnormal findings on the chest imaging tests before initiation of the empirical antifungal therapy (P=0.022, HR, 2.03; 95% CI, 1.11-3.71) were significantly associated with poor outcomes for the empirical antifungal therapy. Eight patients (2.0%) had premature discontinuation of itraconazole therapy due to toxicity. It is suggested that positive galactomannan tests and abnormal findings on the chest imaging tests at the time of initiation of the empirical antifungal therapy are risk factors for predicting the failure of the empirical antifungal therapy with itraconazole. (Clinical Trial Registration on National Cancer Institute website, NCT01060462).
    Journal of Korean medical science 01/2014; 29(1):61-8. · 0.84 Impact Factor
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    ABSTRACT: Pendrin mutations cause enlarged vestibular aqueducts and various degrees of sensorineural hearing loss. The selective abolition of pendrin causes dilation of the membranous labyrinth known as endolymphatic hydrops, loss of the endocochlear potential, and consequently loss of hearing function. Because Na+ transport is one of the most important driving forces for fluid transport, the epithelial Na+ channel (ENaC) is believed to play an important role in fluid volume regulation in the inner ear. Therefore, the dysfunction of Na+ transport through ENaC by the acidification of endolymph in Pendred syndrome is one of the potential causes of endolymphatic hydrops. We investigated the changes of ENaC expression and function during the development of the pendrin knock-out mouse. In the cochlea, the expression of β and γENaC was significantly increased at P56 in Pds-/- mice compared with Pds+/+ mice. In the vestibule, the expression of βENaC was significantly increased at P56, and γENaC expression significantly increased from P6 to P56 in Pds-/- mice. The ENaC-dependent trans-epithelial current was not significantly different between Pds+/+ and Pds-/- mice in Reissner's membrane or the saccular extramacular roof epithelium at P0, but the current was significantly increased in Pds-/- mice at P56 compared with Pds+/+ mice. These findings indicate that the expression and function of ENaC were enhanced in Pds-/- mice after the development of endolymphatic hydrops as a compensatory mechanism. This result provides insight into the role of Na+ transport in the development and regulation of endolymphatic hydrops due to pendrin mutations.
    PLoS ONE 01/2014; 9(4):e95730. · 3.53 Impact Factor
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    ABSTRACT: Hexagonal Ba-ferrites are widely suggested as materials for small antennas. In this paper, the sintering behavior and magneto-electric properties of () ceramics were investigated for small antenna application. All samples of ceramics were prepared by the solid-state reaction method and sintered at . From the XRD patterns of the sintered ceramics, the Z-type phases were found to be the main phases. The real part of permittivity and permeability of the ceramics decreased with frequency. On the other hand, loss tangents of permittivity and permeability tended to behave opposite to real part of permittivity and permeability. The real part of permeability was affected by Mn additions. The real part of permittivity, the loss tangent of permittivity and the real part of permeability, the loss tangent of permeability of ceramics were 19.774, 0.176 and 15.183, 0.073, respectively, at 510 MHz. In order to investigate the effect of magneto-dielectric ceramics on antenna, PIFA (Planar Inverted F Antenna) was simulated with CST (Computer Simulation Technology). The operating frequency of antenna was decreased without considerable change of bandwidth by using the ceramics as the carrier.
    Journal of Electrical Engineering and Technology 01/2014; 9(1). · 0.73 Impact Factor
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    ABSTRACT: ZnO nanodisks on indium-tin-oxide film coated glass substrates were formed using electrochemical deposition with different electrolyte concentrations. X-ray photoelectron spectroscopy spectra showed Zn 2p 3/2 , Zn 2p 1/2 , and O 1s peaks of ZnO samples, indicative of the formation of ZnO nanodisks. Scanning electron microscopy images showed that the density of the ZnO nanodisks increased with increasing electrolyte concentration. X-ray diffraction patterns showed that the intensities corresponding to the (100), (002), and (101) peaks for the ZnO nanodisks with the wurtzite structures increased with increasing electrolyte concentration, indicative of the preferential formation of the ZnO nanodisks. Photoluminescence spectra at 300 K for ZnO nanodisks showed that the dominant PL peak intensity of the near band-edge emissions decreased with increasing electrolyte concentration.
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    ABSTRACT: Preimplantation genetic diagnosis (PGD) is an assisted reproductive technique for couples carrying genetic risks. Charcot-Marie-Tooth (CMT) disease is the most common hereditary neuropathy, with a prevalence rate of 1/2,500. In this study, we report on our experience with PGD cycles performed for CMT types 1A and 2F. Before clinical PGD, we assessed the amplification rate and allele drop-out (ADO) rate of multiplex fluorescent polymerase chain reaction (PCR) followed by fragment analysis or sequencing using single lymphocytes. We performed six cycles of PGD for CMT1A and one cycle for CMT2F. Two duplex and two triplex protocols were developed according to the available markers for each CMT1A couple. Depending on the PCR protocols, the amplification rates and ADO rates ranged from 90.0% to 98.3% and 0.0% to 11.1%, respectively. For CMT2F, the amplification rates and ADO rates were 93.3% and 4.8%, respectively. In case of CMT1A, 60 out of 63 embryos (95.2%) were diagnosed and 13 out of 21 unaffected embryos were transferred in five cycles. Two pregnancies were achieved and three babies were delivered without any complications. In the case of CMT2F, a total of eight embryos were analyzed and diagnosed. Seven embryos were diagnosed as unaffected and four embryos were transferred, resulting in a twin pregnancy. Two healthy babies were delivered. This is the first report of successful pregnancy and delivery after specific PGD for CMT disease in Korea. Our PGD procedure could provide healthy babies to couples with a high risk of transmitting genetic diseases.
    Clinical and experimental reproductive medicine. 12/2013; 40(4):163-8.
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    ABSTRACT: [1] The effects of the stratospheric quasi-biennial oscillation (QBO) on spring rainfall in the western North Pacific (WNP) are investigated using observational and reanalysis data for 1979–2012. After excluding the strong El Niño–Southern Oscillation events, composite analyses between opposite phases of the QBO are applied to the rainfall and related meteorological fields to show the differences in each QBO phase. In comparison with the easterly phase, during the westerly QBO, a midlatitude spring rainband extending from southeastern China to the east of the Japanese Islands is displaced southward, and thus, the spring rainfall over Korea and Japan exhibits a significant decrease. Such changes in the spring WNP rainfall are related to the location and intensity of the WNP subtropical high (WNPSH) and the East Asian jet (EAJ). The possible role of the QBO in modulating the WNPSH and the EAJ is discussed with regard to the strength of the Hadley circulation.
    Geophysical Research Letters. 11/2013; 40(22).
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    ABSTRACT: Pentafluorophenyl end-capped poly(ethylene glycol) (PF-PEG-PF) aqueous solution shows a lower critical solution temperature (LCST), which is sensitive to the type of gases dissolved in the solution. LCST increases from 24.5 to 26 °C when dissolved carbon dioxide is replaced by oxygen. The transparent-to-turbid transition is reversibly observed when the dissolved carbon dioxide in the PF-PEG-PF aqueous solution is exchanged with oxygen, and vice versa, at 24.5 °C. (19) F NMR and (1) H NMR spectra of the PF-PEG-PF in D2 O suggest that 1) dehydration of PEG is the main reason of developing LCST of the PF-PEG-PF aqueous solution, 2) minute differences in the intermolecular interactions, as demonstrated by changes in the chemical shift of the PF-PEG-PF peaks, induce such a difference in LCST. This paper provides a new insight in designing a stimuli-responsive polymer in that fine tuning of a phase transition can be controlled by the type of dissolved gas.
    Macromolecular Rapid Communications 11/2013; · 4.93 Impact Factor
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    ABSTRACT: Pin1, a conserved eukaryotic Peptidyl-prolyl cis/trans isomerase, has profound effects on numerous key-signaling molecules, and its deregulation contributes to disease, particularly cancer. Although Pin1-mediated prolyl isomerization is an essential and novel regulatory mechanism for protein phosphorylation, little is known about the upstream signaling pathway(s) that regulates Pin1 activity. Here, we identify MAP3K-related serine-threonine kinase (the gene encoding COT/Tpl2) as a kinase responsible for phosphorylation of Pin1 Ser16. COT interacts with and phosphorylates Pin1 on Ser16. Consequently, Pin1 Ser16 phosphorylation by COT increases cyclin D1 abundance and enhances tumorigenecity of MCF7 cells. In contrast, depletion of COT in MCF7 cells leads to downregulation of Pin1 Ser16 phosphorylation, which subsequently decrease cyclin D1 levels, inhibiting tumorigenecity of MCF7 cells. In a xenograft model, treatment of TKI, a COT inhibitor, and Juglone, a Pin1 inhibitor, abrogates tumor growth. In human breast cancer patients, immunohistochemical staining shows that Pin1 pSer16 levels are positively correlated with COT levels, providing strong evidence for an essential role of the COT/Pin1 axis in conveying oncogenic signals to promote aggressiveness in human breast cancer. © 2013 Wiley Periodicals, Inc.
    Molecular Carcinogenesis 11/2013; · 4.27 Impact Factor
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    ABSTRACT: Sensory information plays an important role to determine psycho-emotional behaviours of individuals. Lingual nerve can be damaged by dental surgery or trauma, such as physical irritation, radiation, chemotherapy, or viral infection. This study was conducted to examine the psycho-emotional effects of lingual nerve damage in which oral sensory relay to the brain is disrupted. Male Sprague-Dawley rats were tested for anxiety and depression-related behaviours after bilateral transections of the lingual and chorda tympani nerves (Nx) or sham operation. Tissue contents of serotonin and its metabolite in the hippocampus, hypothalamus, and nucleus accumbens were analyzed by high-performance liquid chromatography. Sucrose preference was reduced in Nx rats compared with sham rats, suggesting the development of anhedonia, decreased pleasure seeking behaviour, by the lingual nerves transection. Ambulatory activity was decreased, anxiety-related behaviours during the activity test increased, time spent in the open arms during elevated plus maze test decreased, and immobility duration during forced swim test increased in Nx rats compared with sham rats. Serotonin level in the hippocampus of Nx rats was decreased significantly compared with sham rats. Results suggest that aberration of oral sensory relay to brain may lead to the development of depression- and anxiety-related disorders, and decreased serotonergic neurotransmission in the hippocampus may play a role in its underlying mechanism.
    Archives of oral biology 11/2013; 58(11):1652-1658. · 1.65 Impact Factor
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    ABSTRACT: The way a searcher interacts with query results can reveal a lot about what is being sought. Considerable research has gone into using implicit relevance feedback to identify relevant con-tent in real-time, but little is known about how to best present this newly identified relevant content to users. In this paper we compare a traditional search interface with one that dynamical-ly re-ranks and recommends search results as the user interacts with it in order to build a picture of how and when users should be offered dynamically identified relevant content. We present several studies that compare logged behavior for hun-dreds of thousands of users and millions of queries as well as self-reported measures of success across the two interaction models. Compared to traditional web search, users presented with dynamically ranked results exhibit higher engagement and find information faster, particularly during exploratory tasks. These findings have implications for how search engines might best exploit implicit feedback in real-time in order to help users identify the most relevant results as quickly as possible.
    Proceedings of the 22nd ACM international conference on Conference on information & knowledge management; 10/2013

Publication Stats

2k Citations
797.70 Total Impact Points

Institutions

  • 2014
    • National Cancer Center Korea
      • Lung Cancer Branch
      Kōyō, Gyeonggi Province, South Korea
  • 2013–2014
    • Ulsan National Institute of Science and Technology
      • Interdisciplinary School of Green Energy
      Urusan, Ulsan, South Korea
    • Temple University
      • Department of Anatomy and Cell Biology
      Philadelphia, Pennsylvania, United States
    • University of Toronto
      • Department of Electrical and Computer Engineering
      Toronto, Ontario, Canada
  • 1998–2014
    • Korea Institute of Science and Technology
      • • Fuel Cell Research Center
      • • Photo-electronic Hybrids Research Center
      Sŏul, Seoul, South Korea
    • Hyundai Engineering Co., Ltd.
      Sŏul, Seoul, South Korea
  • 2010–2013
    • Pohang University of Science and Technology
      • • Department of Mechanical Engineering
      • • Department of Materials Science and Engineering
      Antō, North Gyeongsang, South Korea
    • National Fisheries Research and Development Institution
      Sŏul, Seoul, South Korea
    • Robert Wood Johnson University Hospital
      New Brunswick, New Jersey, United States
    • Kwandong University
      Gangneung, Gangwon, South Korea
    • Mount Sinai School of Medicine
      • Department of Genetics and Genomic Sciences
      Manhattan, NY, United States
  • 2009–2013
    • Chosun University
      • College of Pharmacy
      Gwangju, Gwangju, South Korea
    • Hallym University Medical Center
      • Department of Ophthalmology
      Seoul, Seoul, South Korea
  • 2005–2013
    • Korea Basic Science Institute KBSI
      Sŏul, Seoul, South Korea
  • 2002–2013
    • Kwangwoon University
      • • Department of Radio Sciences & Engineering
      • • Department of Electrical Engineering
      Sŏul, Seoul, South Korea
    • Chonnam National University
      • • Department of Electrical, Electronic Communication and Computer Engineering
      • • College of Pharmacy
      Yeoju, Gyeonggi, South Korea
  • 1994–2013
    • Seoul National University
      • • Department of Materials Science and Engineering
      • • Department of Biological Sciences
      • • College of Pharmacy
      • • Department of Electrical and Computer Engineering
      Seoul, Seoul, South Korea
  • 2012
    • University of Incheon
      • Department of Physics
      Seoul, Seoul, South Korea
    • University of Massachusetts Amherst
      Amherst Center, Massachusetts, United States
    • Hanyang University
      • College of Engineering
      Ansan, Gyeonggi, South Korea
    • Dongguk University
      Sŏul, Seoul, South Korea
  • 2010–2012
    • Keimyung University
      • Dongsan Medical Center
      Sŏul, Seoul, South Korea
  • 2008–2012
    • Jeju National University
      • Faculty of Biotechnology
      Tse-tsiu, Jeju, South Korea
    • Robert Wood, Johnson University Hospital At Hamilton
      New Jersey, United States
    • Chung-Ang University
      • College of Medicine
      Seoul, Seoul, South Korea
  • 2003–2012
    • Catholic University of Korea
      • • Department of Internal Medicine
      • • College of Medicine
      • • Department of Microbiology
      Seoul, Seoul, South Korea
    • Pusan National University
      • Department of Physics
      Pusan, Busan, South Korea
  • 2011
    • National Institutes of Health
      • Laboratory of Cancer Prevention
      Maryland, United States
  • 2010–2011
    • Chungnam National University
      • College of Pharmacy
      Seongnam, Gyeonggi, South Korea
  • 2008–2011
    • National Renewable Energy Laboratory
      • Chemical and Materials Science Center
      Golden, Colorado, United States
  • 1999–2011
    • Kunsan National University
      • Department of Physics
      Gunzan, North Jeolla, South Korea
  • 2007
    • Kookmin University
      • School of Advanced Materials Engineering
      Seoul, Seoul, South Korea
  • 2005–2006
    • Ewha Womans University
      • • Department of Environmental Science and Engineering
      • • Division of Nursing Science
      Seoul, Seoul, South Korea
  • 2004–2006
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2003–2006
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi Province, South Korea
  • 2002–2003
    • Catholic University of Daegu
      • Department of Radiology
      Hayang, North Gyeongsang, South Korea
  • 2001
    • Korea Advanced Institute of Science and Technology
      • Department of Materials Science and Engineering
      Seoul, Seoul, South Korea
    • Inje University
      • Graduate School
      Kŭmhae, South Gyeongsang, South Korea
  • 2000
    • SK Telecom
      Sŏul, Seoul, South Korea
  • 1998–2000
    • Princeton University
      • Department of Electrical Engineering
      Princeton, NJ, United States
  • 1995–1998
    • Dongseo University
      Tsau-liang-hai, Busan, South Korea