Seung Ho Choi

Korea University, Sŏul, Seoul, South Korea

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Publications (119)291.8 Total impact

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    ABSTRACT: Background and aim: The role of screening endoscopy in primary gastric lymphoma (PGL) has not been investigated. This study aimed to evaluate the clinical characteristics and outcomes of PGLs detected by screening endoscopy in the high prevalence area of Helicobacter pylori (H. pylori) infection. Methods: This retrospective cohort study enrolled consecutive subjects who were diagnosed as PGL by endoscopic screening in Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea between October 2003 and September 2013. The characteristics and outcome of screening-detected patients (screening group) were compared with consecutive subjects diagnosed with PGL in the outpatient clinic (outpatient group). Results: Of the 105,194 recipients of screening upper endoscopy, 52 (0.049%) were found to have PGL. The median age was 54.2 years (range 23-79), and 65.4% were female. The proportion of PGL to gastric malignancy was 12.1% (52/429) overall, but >30% (25/73) in middle-aged (40-59) females. PGLs in the screening group were more likely to be mucosa-associated lymphoid tissue (MALT) lymphoma (98.1% vs. 60.0%, P < 0.001) and treated with H. pylori eradication alone (90.0% vs. 48.1%, P < 0.001) than those in the outpatient group. Moreover, the screening group showed better 5-year overall survival (100.0% vs. 89.3%, P = 0.016) and progression-free survival (94.9% vs. 83.4%, P = 0.040) than the outpatient group. Conclusions: In Korea, the high prevalence area of H. pylori infection, PGL seems more prevalent than Western countries. Endoscopic screening may help to detect early stage H. pylori-positive MALT lymphoma. A high index of suspicion is needed, especially in middle-aged women.
    No preview · Article · Feb 2016 · Journal of Gastroenterology and Hepatology
  • Seung Ho Choi · Yun Chan Kang
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    ABSTRACT: Three-dimensional (3D) porous-structured carbon nanotube (CNT) balls embedded with fullerene-like MoSe2 nanocrystals were successfully prepared by the spray pyrolysis process and subsequent selenization process. The MoO2–CNT composite balls prepared by spray pyrolysis transformed into the fullerene-like MoSe2/CNT (F-MoSe2/CNT) composite balls by the selenization process. The F-MoSe2/CNT composite balls exhibited superior sodium-ion storage properties to bare MoSe2 and MoSe2/CNT with a filled structure (N-MoSe2/CNT), both of which were prepared as comparison samples. The 250th discharge capacities of bare MoSe2, N-MoSe2/CNT composite balls, and F-MoSe2/CNT composite balls were 144, 200, and 296 mA h g-1, respectively, at a high current density of 1.0 A g-1, and their capacity retentions measured from the second cycle were 37%, 66%, and 83%, respectively. The 10th discharge capacities of the F-MoSe2/CNT composite balls were 382, 346, 310, 280, and 255 mA h g-1 at current densities of 0.2, 0.5, 1.5, 3.0, and 5.0 A g-1, respectively. The synergetic effect of the fullerene-like MoSe2 nanocrystals with ultrafine sizes and the CNT balls with a tangled and 3D porous structure and high electronic conductivity resulted in excellent sodium-ion storage properties of the F-MoSe2/CNT composite balls.
    No preview · Article · Jan 2016 · Nanoscale
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    ABSTRACT: A survey to evaluate the current status of bariatric and metabolic operations in Korea was conducted. Data from 5467 cases (32 hospitals) were collected. The annual numbers of bariatric and metabolic operations increased each year, from 139 in 2003 to 1686 in 2013. Adjustable gastric band (AGB, 67.2 %) was the most common operation, followed by sleeve gastrectomy (SG, 14.2 %), and Roux-en-Y gastric bypass (RYGB, 12.7 %). Mean patient age and body mass index (BMI) were 35.4 years and 35.9 kg/m2, respectively. In-hospital morbidity and mortality rates were 6 % (114/2305) and 0.25 % (5/2176), respectively. In Korea, AGB was the most common operation because of the availability and activity of specialized bariatric clinics. These national survey results established a baseline for future data collection.
    Preview · Article · Dec 2015 · Obesity Surgery
  • Seung Ho Choi · Jong Hwa Kim · Yun Ju Choi · Yun Chan Kang
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    ABSTRACT: Three-dimensional (3D) carbon nanotube (CNT)-multicomponent metal oxide composite microspheres with non-aggregation characteristics are prepared using a simple one-pot spray pyrolysis process, applying water-soluble metal salt and oxidized CNT fibers. The hierarchical porous 3D structure of the CNT is formed by networking the flexible CNTs with a high aspect ratio during the drying stage of a droplet. Subsequently, the Zn and Ge salts are deposited over the CNTs to form the ZnO-CNT and GeO2-CNT composite microsphere. Decomposition of Zn and Ge salts into their respective oxides and the conversion reaction to form Zn2GeO4 at 700 °C, produce the Zn2GeO4-CNT composite microsphere. The initial discharge capacities of the Zn2GeO4, Zn2GeO4-CNT, ZnO-CNT, and GeO2-CNT microspheres, at a current density of 1.5 A g−1, are 1351, 1211, 1387, and 1631 mA h g−1, respectively, and their discharge capacities at the 300th cycle are 415, 762, 261, and 480 mA h g−1, respectively. The CNT-Zn2GeO4 composite microspheres, selected as the first target material, show electrochemical properties superior to those of the bare Zn2GeO4, CNT-ZnO, and CNT-GeO2 composite microspheres. The synergetic effect of the multicomponent composition of Zn2GeO4 and the CNT support result in excellent Li-ion storage properties of the Zn2GeO4-CNT composite microspheres.
    No preview · Article · Dec 2015
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    ABSTRACT: Aim: We aimed to develop a plasma protein signature for breast cancer diagnosis by using multiple reaction monitoring (MRM)-based mass spectrometry. Materials and Methods: Based on our previous studies, we selected 124 proteins for MRM. Plasma samples from 80 patients with breast cancer and 80 healthy women were used to develop a plasma proteomic signature by an MRM approach. The proteomic signature was then validated in plasma samples from 100 patients with breast cancer and 100 healthy women. Results: A total of 56 proteins were optimized for MRM. In the verification cohort, 11 proteins exhibited significantly differential expression in plasma from patients with breast cancer. Three proteins (neural cell adhesion molecule L1-like protein, apolipoprotein C-1 and carbonic anhydrase-1) with highest statistical significance which gave consistent results for patients of stage I and II breast cancer were selected and a 3-protein signature was developed using binary logistic regression analysis [area under the curve (AUC)=0.851, sensitivity=80.6%]. The 3-protein signature showed similar performance in an independent validation cohort with an AUC of 0.797 and sensitivity of 77.2% for detection of stage I and II breast cancer. Conclusion: We developed a distinct plasma protein signature for breast cancer diagnosis based on an MRM-based approach, and the clinical value of the 3-protein signature was validated in an independent cohort.
    No preview · Article · Nov 2015 · Anticancer research
  • Seung Ho Choi · Yun Chan Kang
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    ABSTRACT: Mixed metal sulfide composite microspheres with a yolk-shell structure for sodium-ion batteries are studied. Tin-molybdenum oxide yolk-shell microspheres prepared by a one-pot spray pyrolysis process transform into yolk-shell SnS-MoS2 composite microspheres. The discharge capacities of the yolk-shell and dense-structured SnS-MoS2 composite microspheres for the 100th cycle are 396 and 207 mA h g-1, and their capacity retentions measured from the second cycle are 89 and 47%, respectively. The yolk-shell SnS-MoS2 composite microspheres with high structural stability during repeated sodium insertion and desertion processes have low charge-transfer resistance even after long-term cycling. The synergetic effect of the yolk-shell structure and uniform mixing of the SnS and MoS2 nanocrystals result in the excellent sodium-ion storage properties of the yolk-shell SnS-MoS2 composite microspheres by improving their structural stability during cycling.
    No preview · Article · Oct 2015 · ACS Applied Materials & Interfaces
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    ABSTRACT: In this paper, we present a novel technique to sense, blindly infer signal features [FFT size, cyclic prefix (CP) length], and detect OFDM signals based on second order cyclostationarity analysis. First, we infer accurate FFT size and CP length from the sensed signal based on cross correlation, through considering FFTs of different size (2L) and CPs length. In our experimental study, we assume that CP length in the sensed OFDM signal could be 5–15 % of the FFT size {64, 128, 256, 512, 1024, 2048 and 4096} used at primary user level. We successfully estimate accurate FFT size and CP length, and carry out performance analysis of the proposed approach at various channel conditions, and the effect of increase in sample length (frames) of the sensed signal. Additionally, we derive a recursive procedure to calculate the cross-correlation at sample (l + 1), using the cross-correlation value at sample (l) and a few mathematical operations. We have also tested MAX values distribution for FFT size and CP, whether inferred parameters are valid or not, by finding the confidence of estimation. With experimental results we evaluated that the proposed approach can successfully measure unknown OFDM signal parameters and detect OFDM signals.
    No preview · Article · Oct 2015 · Wireless Personal Communications
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    ABSTRACT: Colorectal adenoma and coronary atherosclerosis have similar risk factors. The aim of this study was to investigate the association between colorectal adenoma and coronary artery calcification (CAC), which is used as a surrogate marker for coronary atherosclerosis. This is a cross-sectional study of 398 Koreans (290 males, mean age of 56.8 ± 8.1 years) who underwent CAC scoring by multi-slice computed tomography and colonoscopy on the same day as the screening examination. The CAC scores were divided into the following three categories according to severity: absent (CAC score = 0), mild (0 < CAC score ≤ 100), and moderate-to-severe CAC (CAC score > 100). Colorectal adenoma was detected in 149 (37.4%) subjects and was significantly associated with a CAC score of >0 (OR = 1.66, 95% CI = 1.05-2.64, P = 0.032), including both mild (OR = 1.80, 95% CI = 1.06-3.03, P = 0.029) and moderate-to-severe CAC (OR = 1.95, 95% CI = 1.05-3.63, P = 0.035), in multivariate analysis after adjusting for age, gender and other risk factors. The proportion of subjects with colorectal adenoma and advanced adenoma progressively increased with increasing CAC score (colorectal adenoma 28.9%-54.1%, P for trend < 0.001; advanced adenoma 7.0%-16.4%, P for trend = 0.026). Colorectal adenoma is related to coronary artery calcification independent of traditional risk factors for asymptomatic Koreans. The prevalence of advanced adenoma is more common in individuals with severe coronary atherosclerosis. Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.
    No preview · Article · Aug 2015 · Atherosclerosis

  • No preview · Article · Jul 2015
  • Seung Ho Choi · Hong Kook Kim
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    ABSTRACT: Speech is the most natural medium for human communication. Thus, the goal of automatic speech recognition (ASR) is to help humans easily communicate with computational devices and to integrate technology into human life. ASR is very useful and has many applications in various areas. However, speaking rate is one of the variabilities influencing ASR performance. In this paper, we propose a maximum likelihood (ML) speaking rate normalization approach for hidden Markov model (HMM)-based speech recognition, which is realized through the combination of signal-level and acoustic model-level approaches. The speaking rate of input speech is controlled by applying a time-scale modification (ISM) algorithm. Speaking rate normalization is achieved by selecting a scale factor of ISM. The scale factor selection for training and testing of a speech recognition system is performed based on an ML criterion during HMM decoding. From connected digit recognition experiments, it is shown that a speech recognition system employing the proposed speaking rate normalization technique can reduce average word error rate (WER) by 9.5% compared to that without any speaking rate normalization.
    No preview · Article · Jul 2015 · Asia life sciences
  • Seung Ho Choi · Yun Chan Kang
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    ABSTRACT: MoS2 -amorphous carbon (MoS2 -AC) composite microspheres with macroporous structure were fabricated by one-pot spray pyrolysis. Single- or few-layered MoS2 were uniformly dispersed and oriented in random directions in the amorphous carbon microsphere with macropores sizes between 50 and 90 nm. The macroporous microspheres having a high contact area with liquid electrolyte exhibited overall superior Li- and Na-ion storage properties compared with those of the dense microspheres. After 250 charge/discharge cycles at a current density of 1.5 A g(-1) , the discharge capacities of the MoS2 -AC microspheres with dense and macroporous structures for Li-ion storage were 694 and 896 mAh g(-1) , respectively. In the case of Na-ion storage, discharge capacities of 336 and 425 mAh g(-1) were achieved for the dense and macroporous microspheres, respectively, after 100 cycles at 0.3 A g(-1) . © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    No preview · Article · Jun 2015 · ChemSusChem
  • Seung Ho Choi · Yun Chan Kang
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    ABSTRACT: A few-layered MoS2-C composite material is studied as a supporting material for silicon nanopowder. Microspheres of the few-layered MoS2-C composite embedded with 30 wt.% Si nanopowder are prepared by one-pot spray pyrolysis. The Si nanopowder particles with high capacity are completely surrounded by the few-layered MoS2-C composite matrix. The discharge capacities of the MoS2-C composite microspheres with and without 30 wt.% Si nanopowder after 100 cycles are 1,020 and 718 mAh·g−1 at a current density of 1,000 mA·g−1, respectively. The spherical morphology of the MoS2-C composite microspheres embedded with Si nanopowder is preserved even after 100 cycles because of their high structural stability during cycling. The MoS2-C composite layer prevents the formation of unstable solid-electrolyte interface (SEI) layers on the Si nanopowder. Furthermore, as the MoS2-C composite matrix exhibits high capacity and excellent cycling performance, these characteristics are also reflected in the MoS2-C composite microspheres embedded with 30 wt.% Si nanopowder. [Figure not available: see fulltext.] © 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.
    No preview · Article · May 2015 · Nano Research
  • Seung Ho Choi · Yun Chan Kang
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    ABSTRACT: SnS-C composite powders were prepared through one-pot spray pyrolysis for use as anode materials for Na-ion batteries. C microspheres with uniformly attached cubic-like SnS nanocrystals, which have an amorphous C coating layer, were formed at a preparation temperature of 900 °C. The initial discharge capacities of the bare SnS and SnS-C composite powders at a current density of 500 mA·g−1 were 695 and 740 mA·h·g−1, respectively. The discharge capacities after 50 cycles and the capacity retentions measured from the second cycle of the bare SnS and SnS-C composite powders were 25 and 433 mA·h·g−1 and 5 and 89%, respectively. The prepared SnS-C composite powders with high reversible capacities and good cycle performance can be used as Na-ion battery anode materials.
    No preview · Article · May 2015 · Nano Research
  • Chenlin Hu · Jin Young Kim · Seung Ho Choi · Chang Joo Kim
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    ABSTRACT: Tonal signals are shown as spectral peaks in the frequency domain. When the number of spectral peaks is small and the spectral signal is sparse, Compressive Sensing (CS) can be adopted to locate the peaks with a low-cost sensing system. In the CS scheme, a time domain signal is modelled as $\boldsymbol{y}=\bPhi F^{-1}\boldsymbol{s}$, where y and s are signal vectors in the time and frequency domains. In addition, F-1 and $\bPhi$ are an inverse DFT matrix and a random-sampling matrix, respectively. For a given y and $\bPhi$, the CS method attempts to estimate s with l0 or l1 optimization. To generate the peak candidates, we adopt the frequency-domain information of $\resmile{\boldsymbol{s}}$ = $\boldsymbol{F}\resmile{\boldsymbol{y}}$, where $\resmile{y}$ is the extended version of y and $\resmile{\boldsymbol{y}}\left(\boldsymbol{n}\right)$ is zero when n is not elements of CS time instances. In this paper, we develop Gaussian statistics of $\resmile{\boldsymbol{s}}$. That is, the variance and the mean values of $\resmile{\boldsymbol{s}}\left(\boldsymbol{k}\right)$ are examined.
    No preview · Article · May 2015 · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences
  • Tran Thi Thu Ha · Jin Young Kim · Seung Ho Choi · Pham The Bao

    No preview · Article · Mar 2015
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    Seung Ho Choi · Yun Chan Kang
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    ABSTRACT: The electrochemical properties of binary transition metal sulfide-reduced graphene oxide (RGO) composite powders, relevant for their performance as anode materials in sodium ion batteries, are firstly studied. (Ni,Co)O-RGO composite powders prepared by spray pyrolysis are transformed into Ni3Co6S8-RGO composite powders by a simple sulfidation process. Plate-shape nanocrystals of nickel-cobalt sulfide (Ni3Co6S8) are uniformly distributed over the crumpled RGO structure. The discharge capacities of the Ni3Co6S8-RGO composite powders for 2nd and 100th cycles at a current density of 0.5 A g-1 are 504 and 498 mA h g-1, respectively. However, the discharge capacities of the bare Ni3Co6S8 powders for 2nd and 100th cycles are 522 and 125 mA h g-1, respectively. The NiO-Co3O4 and (Ni,Co)O-RGO composite powders prepared by spray pyrolysis also show low discharge capacities of 122 and 119 mA h g-1, respectively, after 100 cycles. The high structural stability of the Ni3Co6S8-RGO composite powders during repeated sodium ion intercalation/deintercalation processes results in excellent cycling and rate performances for Na+ storage.
    Full-text · Article · Mar 2015 · Nanoscale
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    Seung Ho Choi · Yun Chan Kang
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    ABSTRACT: Layered WS2 nanosheet-decorated three-dimensional reduced graphene oxide (3D-RGO) microspheres are prepared as anode materials for sodium ion batteries. WO3 nanocluster-decorated 3D RGO microspheres are transformed into multi-layered WS2-3D RGO microspheres by a simple sulfidation process. The WS2-3D RGO microspheres show Na(+) storage properties superior to those of the WO3-3D RGO microspheres.
    Full-text · Article · Feb 2015 · Nanoscale
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    ABSTRACT: Background To investigate the role of lymph node density (LND) as an independent prognostic factor in high-grade salivary gland cancers.Methods All 87 patients with high-grade salivary gland cancers underwent curative surgery combined with neck dissection and most of them received postoperative radiotherapy or chemoradiotherapy. LND was calculated as the ratio of positive lymph nodes to total lymph nodes harvested. Clinicopathologic variables associated with cancer-specific survival (CSS) and overall survival (OS) were identified by univariate and multivariate analyses using the Cox-proportional hazards model.ResultsSalivary duct carcinoma was the most common tumor (54%), followed by carcinoma ex pleomorphic adenoma (22%), and others. The 5-year CSS and OS were 50.9% and 49.6%, respectively, during a median follow-up of 61 months. In univariate analysis, tumor site, pathologic nodal stage, overall tumor-node-metastasis (TNM) stage, primary tumor size >3 cm, lymphovascular invasion, perineural invasion, extranodal extension, number of metastatic lymph nodes, and LND >4.0 were significant prognostic factors for CSS and OS (P < 0.05 each). Tumor site, perineural invasion, and LND were independent prognostic factors for both CSS and OS in multivariate analysis (P < 0.01).Conclusion Our findings support the prognostic value of LND for high-grade salivary gland cancers. J. Surg. Oncol. © 2015 Wiley Periodicals, Inc.
    No preview · Article · Jan 2015 · Journal of Surgical Oncology
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    ABSTRACT: BACKGROUND The prognostic role of swallowing-related, pretreatment subjective and objective findings has not been investigated in detail. The authors evaluated the association between pretreatment MD Anderson Dysphagia Inventory (MDADI) or videofluorographic swallowing study (VFSS) results and standard outcomes, including early recurrence and survival, in patients with treatment-naïve head and neck squamous cell carcinoma (HNSCC).METHODS Patients with HNSCC (n = 191) who received treatment at the authors' institution and were examined by self-administered MDADI questionnaires and VFSS were prospectively enrolled. MDADI and VFSS findings were analyzed in correlation with clinicopathologic variables, and factors that predicted 2-year disease-free survival (DFS) and overall survival (OS) were identified using a Cox proportional-hazards regression model.RESULTSThe 2-year OS and DFS rates were 80.1% and 77.5%, respectively. Clinical tumor (T) and lymph node (N) classifications, overall TNM stage, sex, tumor site, and educational level were significantly associated with specific MDADI subdomains, whereas Karnofsky performance score was significantly associated with all MDADI subdomains. After controlling for clinical factors, total scores, global assessment scores, and emotional and physical MDADI subscores were significantly predictive of 2-year OS and DFS (P < .05 for each). VFSS findings were not significantly associated with survival (P > .05).CONCLUSIONS The current results provide evidence of the prognostic role of the MDADI in predicting early survival outcomes in patients with HNSCC. The MDADI may be a practical and noninvasive method for the identification of patients at risk who would benefit from close follow-up. Cancer 2015. © 2015 American Cancer Society.
    No preview · Article · Jan 2015 · Cancer
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    ABSTRACT: Maintenance of a remifentanil infusion during anesthetic emergence has been reported to decrease the incidence of coughing and thereby help to ensure a smooth emergence. It may, however, cause respiratory depression and possibly delay emergence. The purpose of this study was to investigate the effect of a single dose of dexmedetomidine combined with a low-dose remifentanil infusion on cough suppression during emergence from general anesthesia. American Society of Anesthesiologists physical status I-II adults undergoing elective thyroidectomy under sevoflurane anesthesia were recruited and randomly allocated to receive either dexmedetomidine 0.5 μg·kg(-1) iv (Group D, n = 70) or saline (Group S, n = 71), each combined with a low-dose remifentanil infusion ten minutes before the end of surgery. Coughing was assessed using a four-point scale. The respiratory rate (RR), heart rate (HR), and mean arterial pressure were also recorded. The incidence of coughing was lower in Group D than in Group S (64% vs 91%, respectively; mean difference 27%; 95% confidence interval [CI] 13 to 41; P < 0.001). The median cough grade at extubation was also lower in Group D. Mean arterial pressure and HR were elevated in Group S during tracheal extubation but were similar to baseline values in Group D. There was no difference in RR between the two groups throughout the study. A small delay in extubation was observed in Group D (3 minutes longer than Group S; 95% CI 2 to 4; P < 0.001). Compared with an infusion of low-dose remifentanil alone, the addition of a single dose (0.5 μg·kg(-1)) of dexmedetomidine during emergence from sevoflurane-remifentanil anesthesia was effective in attenuating coughing and hemodynamic changes and did not exacerbate respiratory depression after thyroid surgery. This trial was registered at Clinicaltrial.gov, identifier: NCT01774305.
    No preview · Article · Dec 2014 · Canadian Journal of Anaesthesia

Publication Stats

2k Citations
291.80 Total Impact Points

Institutions

  • 2015
    • Korea University
      • Department of Materials Science and Engineering
      Sŏul, Seoul, South Korea
  • 2014-2015
    • University of Ulsan
      • College of Medicine
      Ulsan, Ulsan, South Korea
    • Asan Medical Center
      Sŏul, Seoul, South Korea
    • Gwangju OK Hospital
      Gwangju, Gwangju, South Korea
  • 2007-2015
    • Seoul National University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • University of Canterbury
      • Department of Electrical and Computer Engineering
      Christchurch, Canterbury, New Zealand
    • Seoul National University Bundang Hospital
      Sŏul, Seoul, South Korea
  • 2002-2015
    • Dongshin University
      South Korea
  • 2013-2014
    • Ulsan University Hospital
      Urusan, Ulsan, South Korea
  • 2009-2014
    • Yonsei University
      • Anesthesia and Pain Research Institute
      Sŏul, Seoul, South Korea
  • 2008-2014
    • Yonsei University Hospital
      • • Surgery
      • • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2003-2014
    • Seoul National University of Science and Technology
      • • Department of Electronic IT Media Engineering
      • • Department of Electric Information System Engineering
      Sŏul, Seoul, South Korea
  • 2012-2013
    • Konkuk University
      • Department of Chemical Engineering
      Sŏul, Seoul, South Korea
  • 2009-2013
    • Seoul National University
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2011
    • Sungkyunkwan University
      • Department of Surgery
      Sŏul, Seoul, South Korea
    • Catholic University of Korea
      • College of Medicine
      Sŏul, Seoul, South Korea
  • 2010-2011
    • Purdue University
      • Weldon School of Biomedical Engineering
      ウェストラファイエット, Indiana, United States
  • 1998-2008
    • Korea Advanced Institute of Science and Technology
      • • Department of Biological Sciences
      • • Department of Electrical Engineering
      Sŏul, Seoul, South Korea
  • 1999-2000
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi-do, South Korea