Dae Sik Kim

Kyonggi University, Sŏul, Seoul, South Korea

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Publications (67)110.5 Total impact

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    ABSTRACT: Background: Despite the advances in acute myeloid leukemia (AML) treatment, the prognosis of elderly patients remains poor and no definitive treatment guideline has been established. In the present study, we aimed to evaluate the effectiveness of intensive chemotherapy in elderly AML patients and to determine which subgroup of patients would be most responsive to the therapy. Methods: We retrospectively analyzed 84 elderly patients: 35, 19, and 30 patients were administered intensive chemotherapy, low-dose chemotherapy, and supportive care, respectively. Results: Among those who received intensive chemotherapy, there were 17 cases of remission after induction chemotherapy; treatment-related mortality was 22.9%. The median overall survival was 7.9 months. Multivariate analysis indicated that the significant prognostic factors for overall survival were performance status, fever before treatment, platelet count, blast count, cytogenetic risk category, and intensive chemotherapy. Subgroup analysis showed that intensive chemotherapy was markedly effective in the relatively younger patients (65-70 years) and those with de novo AML, better-to-intermediate cytogenetic risk, no fever before treatment, high albumin levels, and high lactate dehydrogenase levels. Conclusions: Elderly AML patients had better outcomes with intensive chemotherapy than with low-intensity chemotherapy. Thus, appropriate subgroup selection for intensive chemotherapy is likely to improve therapeutic outcome. © 2014 S. Karger AG, Basel.
    Acta haematologica. 12/2014; 133(3):300-309.
  • Dae Sik Kim, Yong Joon Park
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    ABSTRACT: We demonstrate a simple method for enhancing the electrochemical performance of air electrodes of Li–air batteries using a polydopamine coating on the surface of carbon. A thin polydopamine layer on Ketjen black carbon clearly modified the surface properties of the air electrode, in turn resulting in improved electrolyte filling. The coating also passivates surface carbon defects, which may be helpful in suppressing parasitic reactions during cycling. Electrochemical tests of the electrode indicate that the introduction of the polydopamine layer is beneficial in that it increases the capacity, lowers the overpotential, and improves the cyclic performance of Li–air cells. These effects may be associated with the increased active catalytic area of the electrode, mostly resulting from the improved wetting characteristics. The suppression of parasitic reactions due to the passivation of carbon defects also contributes to the enhanced cyclic performance of the polydopamine-treated electrode.
    Electrochimica Acta 06/2014; 132:297–306. · 4.09 Impact Factor
  • Dae Sik Kim, Yong Joon Park
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    ABSTRACT: Oxide catalysts such as MnO2 and Co3O4 are effective in improving the electrochemical performance of the air electrode of a Li–air cell. However, it is difficult to bring the oxide catalyst into homogeneous contact with the reaction products formed during the discharge process. To overcome this problem and to enhance the performance of Li–air cells, an oxide catalyst and an additionally dissolved catalyst (LiI) were used in combination. LiI dissolved in an electrolyte can freely access and react with solid reaction products, thereby facilitating their catalytic decomposition. In this study, the electrochemical performance of an air electrode in combination with a pristine and a LiI-dissolved electrolyte system was characterized and compared. Analysis of the surface morphology of the air electrode before and after cycling along with the phases of the reaction products was conducted.
    Journal of Alloys and Compounds 04/2014; 591:164–169. · 2.73 Impact Factor
  • Dae Sik Kim, Yong Joon Park
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    ABSTRACT: In general, air electrodes are fabricated by mixing an oxide catalyst, carbon, and a binder. However, a nanosized oxide catalyst may not disperse homogeneously; instead, it easily aggregates, thus limiting its full catalytic activity. In order to solve this problem, a carbon nanofiber (CNF)/Co3O4 composite was prepared and characterized in this work. A polydopamine layer was used as a binding agent for the CNFs and Co3O4. The polydopamine-assisted CNF/Co3O4 composite was characterized by homogeneously dispersed nanosized Co3O4 particles, resulting in a wide catalytic active area. The electrode containing the CNF/Co3O4 composite was prepared via the buckypaper method and exhibited superior capacity, lower overpotential, and better cyclic performance than an electrode containing commercial Co3O4 nanoparticles and CNFs. This result indicates that the CNF/Co3O4 composite is an effective catalyst for air electrodes of lithium-air cells.
    Solid State Ionics 03/2014; · 2.05 Impact Factor
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    ABSTRACT: PURPOSE To investigate malignancy risk and US features of two subtypes of thyroid nodules diagnosed as atypia of undetermined significance (AUS) by FNA. METHOD AND MATERIALS The Bethesda System was used for US-guided FNA diagnoses. The study included 200 nodules (Group 1, n=159, Group 2, n=41) of consecutive 187 patients in which FNA showed AUS diagnosis. Group1 included nodules with various types of nuclear atypia. Group2 included nodules with frequent microfollicle formation or Hurthle cells. Final diagnoses were obtained in 82 nodules (33 malignant nodules and 49 benign nodules). Two thyroid radiologists retrospectively evaluated US characteristics of thyroid nodules, and compared the malignancy risk and US features between two groups. A χ2 test was used for statistical analysis. RESULTS Malignancy rate of Group1 was slightly higher than that of Group2, but not statistically significant (Group 1, 41.8% versus Group 2, 33.3%, P = .772). Papillary thyroid cancer was found in 26 (92.9%) of 28 carcinomas in Group1 and in 2 (40%) of 5 carcinomas in Group2. There was significant difference of US features only in the margin and orientation (taller than wide) of nodules between two groups. Smooth margin of a nodule was significantly more common in Group 2 than that in Group 1 (Group 1, 71.1% versus Group 2, 97.6%, P < .001) and spiculated margin was found only in Group 1 (Group 1, 12% versus Group 2, 0%, P = .016). Nonparallel orientation of a nodule was found only in Group 1 (Group 1, 10.7% versus Group 2, 0%, P = .026). There was no significant difference of other US features between the two Groups. Presence of any of 5 malignant US features (spiculated margin, nonparallel orientation, marked hypoechogencity, microcalcification, and macrocalcification) was predictive of malignancy in Group 1 (malignancy 64.2% vs. benign 33.3%, P = .015), but it was not predictive of malignancy in Group 2 (malignancy 20% vs. benign 20%, P = 1). CONCLUSION There was a tendency of higher malignancy risk and incidence of papillary thyroid cancer in Group 1 compared with Group 2. US features of nonparallel orientation and spiculated margin were found only in Group 1, and malignant US features was not predictive of malignancy in Group 2. CLINICAL RELEVANCE/APPLICATION The difference of clinical and US features between the two subtypes of AUS should be considered in the management of thyroid nodules with AUS FNA diagnosis.The difference of clinical and US features b
    Radiological Society of North America 2012 Scientific Assembly and Annual Meeting; 11/2012
  • Dae Sik Kim, Dong Gyu Na
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    ABSTRACT: PURPOSE ‘FNA tract sign’ was defined as a linear hypoechoic needle tract transiently created by to and fro motion of a FNA needle during the FNA procedure. This study was performed to retrospectively determine if the ‘FNA tract sign’ is predictive of a benign follicular thyroid nodule. METHOD AND MATERIALS FNA was performed for 3866 nodules of 2961 patients for 26 months. One experienced radiologist prospectively evaluated the presence of the FNA tract sign during each FNA procedure. This study included 102 (2.6%) nodules of 100 (3.4%) patients that showed FNA tract signs during FNA procedures. Final diagnoses of thyroid nodules were made by surgery for follicular neoplasm or malignancy and by at least two times of FNA or core-needle biopsy for benign thyroid nodules. We retrospectively evaluated US features of nodules and also assessed the FNA cytology results and final diagnoses of positive tract sign nodules. We evaluated the malignancy risk of positive tract sign nodules based on final diagnoses. RESULTS The FNA cytology results of 102 thyroid nodules with FNA tract signs were nondiagnositc 6 nodule (6%), benign 79 (77%), atypical of undetermined significance 13 (13%), and follicular neoplasm 4 (4%). The final diagnosis was made in 49 (48%) of 102 nodules; 48 benign nodules (nodular hyperplasia or benign follicular nodule 47, follicular adenoma 1) and one malignant nodule (minimally invasive follicular carcinoma). The initial FNA cytology results of finally diagnosed thyroid nodules with FNA tract signs were nodiagnostic 1 (2%), benign 43 (88%), AUS 4(8%), and follicular neoplasm 1 (2%). The most common sonographic feature of nodules with FNA tract sign nodules were solid (97%), ovoid to round shape (99%), well-defined smooth margin (71%), isoechogenicity (84%), absence of calcification (91%), central and peripheral vascularity (67%), hypoechoic halo (87%), and absence of spongiform appearance (96%). The malignant risk of nodules with FNA tract sign was 2%. The malignant risk of isoechoic nodules with FNA tract sign was 0% (0/45) and that of hypoechoic nodules with FNA tract sign was 25% (1/4). CONCLUSION FNA tract sign is highly predictive of a benign follicular nodule and isoechoic thyroid nodule with FNA tract sign may be considered as a benign follicular nodule. CLINICAL RELEVANCE/APPLICATION Although FNA tract sign is uncommon, it will be helpful in the management of thyroid nodules.
    Radiological Society of North America 2012 Scientific Assembly and Annual Meeting; 11/2012
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    ABSTRACT: To evaluate the diagnostic values of CT findings of nutcracker syndrome (NCS). Twenty seven subjects that underwent CT and renal venography, were divided into three groups based on the venographic renocaval pressure gradient (PG) and collateral veins of the left renal vein (LRV): non-compensated NCS patients with PG≥3 mm Hg (group 1, n=12), partially compensated NCS patients with borderline PG (1<3 mm Hg) and collateral veins (group 2, n=6), and control group with low PG (0-1 mm Hg) without collateral veins (group 3, n=9). The CT findings were analyzed with regard to abrupt narrowing of the LRV with an acute angle (beak sign), aortomesenteric angle between the superior mesenteric artery and aorta on sagittal images, and LRV diameter ratio (hilar-aortomesenteric). Beak sign of the LRV was found in 91.7% (11/12) of group 1, 50% (3/6) of group 2, and in 11.1% (1/9) of group 3 with the significant difference between groups 1 and 3 (P<.05, χ2 test). Mean values of all quantitative CT parameters differed significantly only between groups 1 and 3 (P<.05, one-way ANOVA test). For differentiating the non-compensated NCS from the control group, the beak sign showed 91.7% sensitivity and 88.9% specificity. Of the various CT parameters, the beak sign and LRV diameter ratio of ≥4.9 showed the greatest diagnostic accuracy (AUC 0.903, ROC analysis). Beak sign of the LRV and CT findings can be useful in diagnosing the non-compensated NCS.
    European journal of radiology 12/2011; 80(3):648-54. · 2.65 Impact Factor
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    Chemistry of Materials. 08/2011; 23(17):3795–3797.
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    ABSTRACT: Laribacter hongkongensis is an emerging pathogen in patients with community-acquired gastroenteritis and traveler's diarrhea. We herein report a case of L. hongkongensis infection in a 24-yr-old male with liver cirrhosis complicated by Wilson's disease. He was admitted to a hospital with only abdominal distension. On day 6 following admission, he complained of abdominal pain and his body temperature reached 38.6℃. The results of peritoneal fluid evaluation revealed a leukocyte count of 1,180/µL (polymorphonuclear leukocyte 74%). Growth on blood culture was identified as a gram-negative bacillus. The isolate was initially identified as Acinetobacter lwoffii by conventional identification methods in the clinical microbiology laboratory, but was later identified as L. hongkongensis on the basis of molecular identification. The patient was successfully treated with cefotaxime. To the best of our knowledge, this case is the first report of hospital-acquired L. hongkongensis bacteremia with neutrophilic ascites.
    Journal of Korean medical science 05/2011; 26(5):679-81. · 0.84 Impact Factor
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    ABSTRACT: Numerous sulfonated polymer electrolyte membranes (PEMs) have been developed for direct methanol fuel cells (DMFCs) during the last decade. An analysis for DMFC PEMs obtained from the literature data and structural information is presented based on non-traditional length scale parameters. The analysis presented highlights specific differences in chemical composition between PEMs including perfluorinated sulfonic acids, hydrocarbon-based and polymers having specific interactions. Differences in cross-linked, homopolymer-like, random and multi-block polymer architectures are also discussed. The analysis presented gives important insight into molecular design aspects of sulfonated PEMs for DMFCs.Highlights► Structural effects of polymer electrolyte membranes for direct methanol fuel cells are investigated using length scale parameters. ► Desirable properties are obtained with high sulfonic acid concentration and low water uptake. ► Strategic approach to improve the membrane properties is demonstrated.
    Journal of Membrane Science 01/2011; 374:49-58. · 4.09 Impact Factor
  • Dae Sik Kim, Michael D. Guiver
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    ABSTRACT: During the last two decades, extensive efforts have been made to develop alternative hydrocarbon-based polymer electrolyte membranes to overcome the drawbacks of the current widely used perfluorosulfonic acid Nafion. This chapter presents an overview of the synthesis, chemical properties, and polymer electrolyte fuel cell applications of new proton-conducting polymer electrolyte membranes based on sulfonated poly(arylene ether ether ketone) polymers and copolymers. Primary attention has been paid to the basic properties of the sulfonated polymer prepared by post-sulfonation and direct copolymerization. This chapter attempts to summarize the preparation of sulfonated poly(arylene ether ether ketone) polymers with high proton conductivity, including synthesis from monomers containing sulfonic acid groups and hybrid membranes containing inorganic materials, and fuel cells derived from new proton-conducting polymer electrolytes that have been made during the past decade.
    07/2010: pages 51-86;
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    ABSTRACT: The purpose of this study was to compare the sonographic features as well as the results of fine-needle aspiration biopsy (FNAB) of follicular variant papillary thyroid carcinoma (FVPTCs) and conventional papillary thyroid carcinoma (PTCs). Forty patients with 44 FVPTCs and 59 patients with 74 conventional PTCs were enrolled in this study. The sonographic features, sonographic gradings, and FNAB results were compared between the two groups. The mean nodule size of FVPTCs was larger than that of conventional PTCs (17.70 versus 10.53 mm; P < .001). Sonographic features of an ovoid-to-round shape (95% versus 73%), isoechogenicity (52% versus 8%), and a hypoechoic halo (25% versus 3%) were more frequent in FVPTCs than conventional PTCs (P < .001). Sonographic features of a taller-than-wide shape (5% versus 22%), a spiculated margin (7% versus 32%), marked hypoechogenicity (5% versus 38%), and microcalcification (7% versus 24%) were rarer in FVPTCs than conventional PTCs (P < .05). The incidence of a sonographically malignant grade was also lower in FVPTCs (48%) than conventional PTCs (81%; P < .001). A diagnosis of PTC on FNAB of FVPTCs was less common than that of conventional PTCs (28% versus 56%; P = .0393); however, a diagnosis of an indeterminate cytologic type such as atypical cells or follicular lesions in FVPTCs was higher than that in conventional PTCs (46% versus 19%; P = .0418). Follicular variant papillary thyroid carcinomas show a relatively larger size, more benign sonographic features, a lower incidence of a sonographically malignant grade, and a lower diagnostic rate of PTC on FNAB compared with conventional PTCs.
    Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 12/2009; 28(12):1685-92. · 1.40 Impact Factor
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    ABSTRACT: To investigate the type of MR imaging diagnosis that corresponded to spinal lesions detected on a bone scan according to the number of lesions in breast cancer patients. We retrospectively reviewed spinal MR images of 134 patients with breast cancer whose bone scans showed one or more spinal hot uptakes. The patients were grouped according to the number of spinal lesions detected on the bone scan: one or two lesions versus multiple (more than two) lesions. By using MR imaging, we determined the etiology of the spinal lesions in terms of being either benign or malignant. If the lesions were benign, we further categorized them into several specific pathologies. Sixty-four (48%) of 134 patients had one or two spinal lesions as seen on a bone scan. On MR imaging, 45 (70%) of the 64 lesions had benign pathologies, whereas 19 lesions (30%) were malignant. The benign pathologies in the 45 patients included facet arthrosis in 20 patients (44%), discovertebral degeneration in 12 patients (27%), compression fractures in eight patients (18%), and Schmorl's nodes in five patients (11%). Seventy (52%) of 134 patients had multiple spinal lesions as seen on the bone scan, and MR imaging revealed multiple bone metastases in 67 patients (96%) and facet arthrosis in three patients (4%). One or two spinal lesions seen on a bone scan in breast cancer patients are more likely to be benign pathologies such as facet arthrosis, discovertebral degeneration, compression fracture or Schmorl's node on MR imaging.
    Nuclear Medicine Communications 10/2009; 30(9):736-41. · 1.38 Impact Factor
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    ABSTRACT: We analyzed the prognostic factors from 259 cases of febrile neutropenia occurring in 137 patients with hematologic disease. Based on multivariate analysis, significant prognostic factors are recovery of neutropenia, respiratory infection, baseline serum albumin, baseline bicarbonate, baseline CRP, and CRP on the fifth day after antibiotic treatment. From these variables, we derived a predictive model for the prognosis of febrile neutropenia using baseline serum albumin, bicarbonate, and CRP, which could be easily checked before chemotherapy. Further studies in prospective setting are needed for the validation of this model.
    Leukemia research 09/2009; 34(3):294-300. · 2.36 Impact Factor
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    ABSTRACT: Post-sulfonation of selective styrene-grafted ultra-high molecular weight polyethylene (UHMWPE-g-PS) films was carried out by chlorosulfonic acid and the properties of the membranes were investigated. The UHMWPE-g-PS films were previously prepared by initial γ-irradiation of polyethylene powder, grafting with styrene, followed by hot-pressing to process into films. The range of ion exchange capacities (IECs) obtained with different degrees of grafting (DG) of styrene was in the range of 0.97–2.77 mequiv./g. The water and methanol uptake of sulfonated films were studied on a weight and volume basis. FTIR spectroscopy and thermal gravimetric analysis (TGA) of control UHMWPE, UHMWPE-g-PS, and UHMWPE-g-PSSA were compared. The methanol permeability values at 30 °C for the series of UHMWPE-g-PSSA membranes were in the range 4.86 × 10−8 to 1.67 × 10−6 cm2/s, with corresponding proton conductivities of 0.025–0.29 S/cm at 90 °C. The methanol permeability values of UHMWPE-g-PSSA were generally lower than that of Nafion 117 for comparable or even higher proton conductivity. Transmission electron microscopy (TEM) analysis was used to observe microstructure for evidence of nanophase separation of hydrophilic and hydrophobic domains. Owing to its low cost and the results of the current study, UHMWPE-g-PSSA is suggested as a viable proton exchange membrane for low temperature hydrogen and direct methanol fuel cell applications.
    Journal of Membrane Science 05/2009; · 4.09 Impact Factor
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    ABSTRACT: To determine retrospectively whether unenhanced computed tomographic (CT) images of the brain have added value in distinguishing tumefactive demyelinating lesions (TDLs) from primary glioma or central nervous system (CNS) lymphoma, compared with conventional contrast material-enhanced magnetic resonance (MR) images only. This study was approved by the institutional review board, and informed consent was waived. Unenhanced CT and MR images in 15 patients with TDLs (seven women, eight men; mean age, 42 years; range, 27-57 years) and 48 patients with primary brain tumor (27 women, 21 men; mean age, 48 years; range, 19-70 years; 10 lymphomas, 38 gliomas) were retrospectively reviewed. The CT attenuation of regions that were enhanced or unenhanced at MR imaging was visually categorized into three grades, and CT attenuation values were determined quantitatively. The diagnostic accuracy of MR imaging for differentiating TDLs from tumors was compared with that of MR imaging plus CT. The following MR imaging features were found more frequently in patients with TDL than in those with brain tumor: incomplete rim enhancement, mixed T2-weighted iso- and hyperintensity of enhanced regions, absence of a mass effect, and absence of cortical involvement (all P values < .05). CT hypoattenuation of MR enhanced regions was observed in 14 (93%) of 15 patients with TDL but in only two (4%) of 48 patients with tumor. The CT attenuation of MR enhanced regions was significantly lower for patients with TDL than for those with tumor (P < .001). The diagnostic accuracy of CT plus MR imaging was significantly higher than that of MR imaging alone (97% vs 73.0%, respectively; P < .001), and the diagnostic accuracy of CT was significantly higher than that of unenhanced T1-weighted MR imaging (95% vs 63%, P < .001). Unenhanced CT plus MR imaging was more accurate for distinguishing TDLs from glioma or CNS lymphoma than contrast-enhanced MR imaging alone.
    Radiology 03/2009; 251(2):467-75. · 6.34 Impact Factor
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    Macromolecules 02/2009; · 5.93 Impact Factor
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    ABSTRACT: Surface fluorination effectively reduced the water absorption of crosslinked polyvinyl alcohol (PVA)/poly(styrene sulfonic acid-co-maleic acid) (PSSA_MA) membranes. The crosslinked PVA membranes were prepared using PSSA_MA as a crosslinking agent as well as a donor of the hydrophilic group (–SO3H and/or –COOH). Surface treatment by gaseous fluorine treatment disrupted the C–OH bonds and generated C–F and C–F2 groups at the membrane surface where atomic percent of fluorine increased up to 5.4%. The membranes with highly hydrophobic fluorinated surface exhibited improved proton conductivity and methanol permeability at a relatively low water uptake.
    Journal of Membrane Science. 01/2009;
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    ABSTRACT: In the present study, crosslinked poly(vinyl alcohol) (PVA) membranes were prepared using poly(styrene sulfonic acid-co-maleic acid) (PSSA_MA) (PVA:PSSA_MA=1:7). The PSSA_MA was used both as a crosslinking agent and as a donor of the hydrophilic group (–SO3H and/or –COOH). The hybrid membranes were prepared by modified clay such as Clay Na+, Clay 30B, and Clay 15A. The thermal, water uptake, proton and methanol transport properties of the hybrid membrane were found to be sensitive to the clay type and content. The hybrid membrane with Clay 30B shows higher proton conductivity than other hybrid membranes due to hydroxyethyl group. The membrane with Clay 15A showed the lowest methanol permeability due to lower specific gravity than other clay. Compared to the membrane without modified, the PVA/PSSA_MA/Clay 15A containing 4wt% of Clay 15A showed both high proton conductivity (0.023S/cm) and low methanol permeability (2.19×10−7cm2/s).
    Journal of Industrial and Engineering Chemistry - J IND ENG CHEM. 01/2009; 15(2):265-269.
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    ABSTRACT: Poly(vinylidene fluoride) (PVDF) membranes were surface-modified using fluorotelemer intermediate Zonyl BA-L as a fluorinated surface modifying macromolecules (SMM) additives in the concentration range from 0 to 2wt.%. Prepared membranes were characterized by contact angle measurement, electron spectroscopy for chemical analysis (ESCA), scanning electron microscopy (SEM), and pervaporation test. The experimental results showed that SMM migrated to the surface and effectively increased the surface hydrophobicity of the PVDF membranes. The pure water permeation flux evaluated by pervaporation decreased with an increase in the content of SMM.
    Journal of Industrial and Engineering Chemistry - J IND ENG CHEM. 01/2009; 15(3):393-397.

Publication Stats

534 Citations
110.50 Total Impact Points

Institutions

  • 2014
    • Kyonggi University
      • Department of Advanced Materials Engineering
      Sŏul, Seoul, South Korea
  • 2011
    • Sungkyunkwan University
      • Department of Internal Medicine
      Seoul, Seoul, South Korea
  • 2009–2011
    • Los Alamos National Laboratory
      • Sensors and Electrochemical Devices Group
      Los Alamos, NM, United States
    • Seoul National University Hospital
      • Department of Radiology
      Seoul, Seoul, South Korea
    • Government College University, Lahore
      • Department of Chemistry
      Lahore, Punjab, Pakistan
  • 2008–2009
    • Korea University
      • Department of Internal Medicine
      Seoul, Seoul, United States
    • Yonsei University Hospital
      • Department of Internal Medicine
      Seoul, Seoul, South Korea
  • 2007
    • Seoul Medical Center
      Sŏul, Seoul, South Korea
  • 2004–2006
    • Hannam University
      Shinshū, South Gyeongsang, South Korea
  • 2003–2006
    • Hanyang University
      • • Division of Chemical Engineering and Bioengineering
      • • Division of Mechanical Engineering
      Seoul, Seoul, South Korea
  • 1993–1996
    • Korea Advanced Institute of Science and Technology
      • Department of Nuclear and Quantum Engineering
      Sŏul, Seoul, South Korea