Sang Woo Kim

Pohang University of Science and Technology, Geijitsu, North Gyeongsang, South Korea

Are you Sang Woo Kim?

Claim your profile

Publications (197)291.71 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: Abstract Despite the fact that gender dimorphism in diet-induced oxidative stress is associated with steroid sex hormones, there are some contradictory results concerning roles of steroid hormones in gender dimorphism. To evaluate the role of gender dimorphism as well as the effects of sex steroid hormones in response to high fat diet (HFD)-induced oxidative stress, we measured cellular levels of major antioxidant proteins in the liver, abdominal white adipose tissue, and skeletal muscles of Sprague-Dawley rats following HFD or sex hormone treatment using Western blot analysis. Animal experiments revealed that estrogen (E2) and testosterone (DHT) negatively and positively affected body weight gain, respectively. Interestingly, plasma levels of malondialdehyde (MDA) increased in both E2- and DHT-treated rats. We also observed that cellular levels of classical antioxidant proteins, including catalase, glutathion peroxidase, peroxiredoxin, superoxide dismutase, and thioredoxin, were differentially regulated hormone- and gender-dependent manner in various metabolic tissues. In addition, tissue-specific expression of DJ-1 protein with respect to HFD-induced oxidative stress in association with sex steroid hormone treatment was observed for the first time. Taken together, our data shows that females were more capable at overcoming oxidative stress than males through feasible expression of antioxidant proteins in metabolic tissues. Although the exact regulatory mechanism of sex hormones in diet-induced oxidative stress could not be fully elucidated, the current data will provide clues regarding the tissue-specific roles of antioxidant proteins during HFD-induced oxidative stress in association with sex steroid hormones.
    Free radical research 02/2014; · 2.22 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: A flexible hybrid anode from graphite and thin film silicon is realized by the concept of a 3D sandwich current collector by the combination of micro-contact printing and RF magnetron sputtering. Flexible lithium-ion batteries with a new hybrid anode demonstrate not only enhanced specific capacity but also improved rate capability compared to that of a conventional graphite anode under bending deformation.
    Advanced Materials 02/2014; · 14.83 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: Caveolin-1 (CAV1) is a conserved group of structural membrane proteins that form special cholesterol and sphingolipid-rich compartments, especially in adipocytes. Recently, it has been reported that CAV1 is an important target protein in sex hormone-dependent regulation of various metabolic pathways, particularly in cancer and diabetes. To clarify distinct roles of CAV1 in sex-dependent obesity development, we investigated the effects of high fat diet (HFD) and sex steroid hormones on CAV1 expression in adipose tissues of male and female rats. Results of animal experiments revealed that estrogen (17-β-estradiol, E2) and androgen (dihydrotestosterone, DHT) had opposite effects on body weight gain as well as on the regulation of CAV1, hormone sensitive lipase (HSL) and uncoupling protein 1 (UCP1) in adipose tissues. Furthermore, sex hormone receptors and aromatase were differentially expressed in a sex-dependent manner in response to E2 and DHT treatments. In vivo data were confirmed using 3T3-L1 and HIB1B cell lines, where Cav1 knock down stimulated lipogenesis but suppressed sex hormone receptor signaling proteins. Most importantly, co-immunoprecipitation enabled the identification of previously unrecognized CAV1-interacting mitochondrial or lipid oxidative pathway proteins in adipose tissues. Taken together, current data showed that CAV1 may play important preventive role in the development of obesity, with more prominent effects in females, and proved to be an important target protein for the hormonal regulation of adipose tissue metabolism by manipulating sex hormone receptors and mitochondrial oxidative pathways. Therefore, we can report, for the first time, the molecular mechanism underlying the effects of sex steroid hormones in the sex-dimorphic regulation of CAV1.
    PLoS ONE 01/2014; 9(3):e90918. · 3.73 Impact Factor
  • Jae-Yong Choi, Sang Woo Kim, Kuk Young Cho
    [show abstract] [hide abstract]
    ABSTRACT: Adhesive nanocomposites, which have potential use as light-weight thermal interface materials for heat removal in electronic devices, were prepared by using graphene-encapsulated poly(methyl methacrylate) microparticles with two different loading amounts of graphene (0.9 and 0.09 wt.%), and their thermal conductivities were compared. Three different types of graphene-encapsulated microparticles (large, small, and those with a rough surface with an internal pore structure) were fabricated and characterized. Adhesive nanocomposites were UV cured easily to a solid state via thiol-ene reaction. The thermal conductivity of the nanocomposites prepared in this study was 200% higher than that of a simple blend of poly(methyl methacrylate) and graphene, despite the low amounts of graphene encapsulation. The results suggest that an improvement in thermal conductivity can be achieved by effective adhesion of graphene to the surface of microparticle. This new approach can be applied where light-weight or transparency is required in addition to transport performance.
    Composites Science and Technology 01/2014; · 3.33 Impact Factor
  • Jong Hyun Choi, Seung Hun Kim, Sang Woo Kim
    [show abstract] [hide abstract]
    ABSTRACT: We propose a novel scheme for combining two adaptation terms of affine projection algorithms with different projection orders and step-sizes. The selection of the mixing parameter that determines the performance of the proposed combination scheme is derived by the largest decrease of the mean-square deviation. The experimental results show that the proposed algorithm exhibits a fast convergence speed and a small steady-state misalignment. Moreover, the proposed algorithm achieves a low computational complexity in the steady-state.
    Signal Processing. 01/2014; 100:64–70.
  • [show abstract] [hide abstract]
    ABSTRACT: The extremely stable high-power generation from hybrid piezoelectric nanogenerator (HP-NG) based on a composite of single-crystalline piezoelectric perovskite zinc stannate (ZnSnO3) nanocubes and polydimethylsiloxane without any electrical poling treatment is reported. The HP-NG generates large power output under only vertical compression, while there is negligible power generation with other configurations of applied strain, such as bending and folding. This unique high unidirectionality of power generation behavior of the HP-NG provides desirable features for large-area piezoelectric power generation based on vertical mechanical compression such as moving vehicles, railway transport, and human walking. The HP-NGs of ZnSnO3 nanocubes exhibit high mechanical durability, excellent robustness, and high power-generation performance. A large recordable output voltage of about 20 V and an output current density value of about 1 μA cm−2 are successfully achived, using a single cell of HP-NG obtained under rolling of a vehicle tire.
    Advanced Functional Materials 01/2014; 24(1). · 9.77 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: Prior to 1994, plantar fascia ruptures were considered as an acute injury that occurred primarily in athletes. However, plantar fascia ruptures have recently been reported in the setting of preexisting plantar fasciitis. We analyzed risk factors causing plantar fascia rupture in the presence of preexisting plantar fasciitis. We retrospectively reviewed 286 patients with plantar fasciitis who were referred from private clinics between March 2004 and February 2008. Patients were divided into those with or without a plantar fascia rupture. There were 35 patients in the rupture group and 251 in the nonrupture group. The clinical characteristics and risk factors for plantar fascia rupture were compared between the 2 groups. We compared age, gender, the affected site, visual analog scale pain score, previous treatment regimen, body mass index, degree of ankle dorsiflexion, the use of steroid injections, the extent of activity, calcaneal pitch angle, the presence of a calcaneal spur, and heel alignment between the 2 groups. Of the assessed risk factors, only steroid injection was associated with the occurrence of a plantar fascia rupture. Among the 35 patients with a rupture, 33 had received steroid injections. The odds ratio of steroid injection was 33. Steroid injections for plantar fasciitis should be cautiously administered because of the higher risk for plantar fascia rupture. Level III, retrospective comparative study.
    Foot & ankle international. / American Orthopaedic Foot and Ankle Society [and] Swiss Foot and Ankle Society. 11/2013;
  • [show abstract] [hide abstract]
    ABSTRACT: Harvesting energy using piezoelectric materials such as ZnO, at nanoscale due to geometrical effects, are highly desirable for powering portable electronics, biomedical, and healthcare applications. Although one-dimensional nanostructures such as nanowires have been the most widely studied for these applications, there exist a limited number of piezomaterials that can be easily manufactured into nanowires, thus, developing effective and reliable means of preparing nanostructures from a wide variety of piezomaterials is essential for the advancement of self-powered devices. In this study, ZnO embossed hollow hemispheres thin film for highly responsive pressure sensors and nanogenerators are reported. The asymmetric hemispheres, formed by an oblique angle deposition, cause an unsymmetrical piezoelectric field direction by external force, resulting in the control of the current direction and level at about 7 mA cm-2 at normal force of 30 N. The nanogenerators repeatedly generate the voltage output of ≈0.2 V, irrespective of the degree of symmetry. It is also demonstrated that when one piece of hemisphere layer is stacked over another to form a layer-by-layer matched architecture, the output voltage in nanogenerators increases up to 2 times.
    Advanced Functional Materials 11/2013; · 9.77 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: The aim of this study is to assess outcomes during first one year for patients with severe motor weakness caused by lumbar disc herniation that underwent surgical or nonsurgical treatment. The 46 patients with motor weakness because of lumbar disc herniation who were treated at neurosurgical department and rehabilitation in our hospital from 2006 to 2010, retrospectively. Each group had 26 surgical treatments and 20 conservative treatments. We followed up 1, 3, 6 months and 12 month and monitored a Visual Analogue rating Scale (VAS) of back and leg pain, Oswestry Disability Index (ODI) and degree of motor weakness. We analyzed the differences between surgical and nonsurgical groups using Mann-Whitney U test and repeat measure ANOVA in each follow-up periods. In the recovery of motor weakness, surgical treatment uncovered a rapid functional recovery in the early periods (p=0.003) and no difference between groups at the end of follow-up period was found (p>0.05). In VAS of back and leg, the interaction between time and group was not found (p>0.05) and there was no difference between groups (p>0.05). In ODI, the interaction between time and group was not found (p>0.05) and there was no difference between groups (p>0.05). Surgical treatment for motor weakness caused by herniated intervertebral disc resulted in a rapid recovery in the short-term period, especially 1 month. We think early and proper surgical treatment in a case of motor weakness from disc herniation could be a good way for providing a chance for rapid alleviation.
    Journal of Korean Neurosurgical Society 09/2013; 54(3):183-188. · 0.56 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The aim of this study was to investigate the difference in clinical and radiographic outcomes between conventional open lateral soft tissue release (OLSTR) and transarticular lateral soft tissue release (TLSTR) in patients undergoing distal chevron metatarsal osteotomy (DCMO) for hallux valgus (HV) correction. This study included weight-bearing anteroposterior radiographs of 138 patients (185 feet) with HV that underwent DCMO and Akin phalangeal osteotomy at a mean age of 51.7 years (21-74) with a mean 26 months of follow-up between June 2004 and June 2010. Patients were classified into two groups: OLSTR as group 1 (84 feet) and TLSTR as group 2 (101 feet). We evaluated clinical and radiographic outcomes between the two groups using the American Orthopaedic Foot and Ankle Society hallux score, visual analogue scale pain score, hallux valgus angle, intermetatarsal angle and complications, pre- and post-operatively. There were no significant differences between the two groups except for post-operative complications such as first metatarsophalangeal joint (MTPJ) stiffness (group 1) and post-operative hallux varus (group 2). Clinical and radiographic outcomes between OLSTR and TLSTR in HV correction using DCMO were not significantly different except for post-operative limitation of motion of the first MTPJ and hallux varus tendency. Different precautions should be taken into account when choosing the type of lateral soft tissue release due to possible complications associated with each technique.
    International Orthopaedics 08/2013; · 2.32 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: To suggest a new useful diagnostic technique, principles of the selective excitation technique-magnetic resonance images (Proset-MRI), and to know the precise radiologic findings that can prove symptomatic foraminal and extraforaminal stenosis at L5-S1. Nineteen patients with symptomatic L5-S1 stenosis were checked by Proset-MRI. Four patients were performed decompressive surgery and 15 patients were performed selective nerve root block (SNRB) at L5. The pain scale of patients was checked by Visual Analogue Scale (VAS) scores at the pre- and post-treatment state. Proset-MRI findings of patients with symptomatic stenosis are root swelling (RS) and indentation. The comparisons with VAS scores had a meaningful statistical result at each RS (p<0.01) and indentation (p<0.01). However, the findings of RS combined with indentation lacked statistical significance (p=0.0249). In addition, according to a comparison with the treatment modalities, reducing of VAS scores had statistical meaningful significance in decompressive surgery cases (p<0.01), and also in SNRB cases (p<0.01) after a 3-month follow-up period. The three dimensional Proset-MRI is very useful and sensitive technique to diagnose the symptomatic foraminal and extraforaminal stenosis at L5-S1.
    Journal of Korean Neurosurgical Society 07/2013; 54(1):30-3. · 0.56 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: Seven bacterial isolates (viz., AB05, AB10, AB11, AB12, AB14, AB15, and AB17) were derived from the rhizosphere and evaluated in terms of plant growth-promoting activities and the inhibition of Phytophthora infestans affecting tomatoes in Korea. According to 16S rDNA sequencing, a majority of the isolates are members of Bacillus, and a single isolate belongs to Paenibacillus. All seven isolates inhibited P. infestans by more than 60% in vitro. However, AB15 was the most effective, inhibiting mycelial growth of the pathogen by more than 80% in vitro and suppressing disease by 74% compared with control plants under greenhouse conditions. In a PGPR assay, all of the bacterial isolates were capable of enhancing different growth parameters (shoot/root length, fresh biomass, dry matter, and chlorophyll content) in comparison with non-inoculated control plants. AB17-treated plants in particular showed the highest enhancement in fresh biomass with 18% and 26% increments in the root and shoot biomass, respectively. However, isolate AB10 showed the highest shoot and root growth with 18% and 26% increments, respectively. Moreover, the total chlorophyll content was 14%~19% higher in treated plants.
    Journal of Microbiology and Biotechnology 05/2013; 23(7):885-892. · 1.40 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: Seven bacterial isolates viz. AB05, AB10, AB11, AB12, AB14, AB15 and AB17 were derived from the rhizosphere and evaluated in terms of plant growth-promoting activities and inhibition of Phytophthora infestans affecting tomatoes in Korea. According to 16S rDNA sequencing, a majority of the isolates are members of Bacillus while a single isolate belongs to Paenibacillus. All seven isolates inhibited P. infestans by more than 60% in vitro. However, AB15 was the most effective, inhibiting mycelial growth of the pathogen by more than 80% in vitro and suppressing disease by 74% compared to control plants under greenhouse conditions. In a PGPR assay, all of the bacterial isolates were capable of enhancing different growth parameters (shoot/root length, fresh biomass, dry matter and chlorophyll content) in comparison to non-inoculated control plants. AB17 treated plants in particular showed the highest enhancement in fresh biomass with 18% and 26% increment in root and shoot biomass, respectively. However, isolate AB10 showed highest shoot and root growth with 18% and 26% increments, respectively. Also, total chlorophyll content was 14%~19%higher in treated plants.
    Journal of Microbiology and Biotechnology 05/2013; · 1.40 Impact Factor
  • Source
    Sang Woo Kim, Jae-Pyoung Ahn
    [show abstract] [hide abstract]
    ABSTRACT: This study proposes a seed/template-free method that affords high-purity semiconducting nanowires from nanoclusters, which act as basic building blocks for nanomaterials, under supercritical CO2 fluid. Polycrystalline nanowires of Gd-doped ceria (Gd-CeO2) were formed by CO2-mediated non-oriented attachment of the nanoclusters resulting from the dissociation of single-crystalline aggregates. The unique formation mechanism underlying this morphological transition may be exploited for the facile growth of high-purity polycrystalline nanowires.
    Scientific Reports 04/2013; 3:1606. · 2.93 Impact Factor
  • Soon-Cheol Kweon, Sang Woo Kim
    [show abstract] [hide abstract]
    ABSTRACT: Ferromagnetic FeCoNi alloy nanowires (NWs) with self-formed anti-oxidation (Si/Al) layers were prepared via electrospinning a sol–gel precursor solution containing Si and Al element and multi-walled carbon nanotubes (MWNTs), and their structures and magnetic properties were investigated. The uniform and narrow-sized MWNTs-magnetic alloy NWs with a well-crystallized bcc (1 1 0) texture of FeCo along the easy axis were formed by introduction of MWNTs acted as a sintering inhibitor during annealing. The coercive field at room temperature increased two times higher than that of MWNT-free magnetic NWs due to the well-developed texture and the small grain size, which is slightly larger than the single domain size within the 10–15 nm range for most magnetic metals. As a result, the highly enhanced ferromagnetic NW mats with a MWNT-incorporated nanowire structure have shown great promise for providing a wide range of potential applications, including magnetic recording and ultrahigh-density magnetic storage devices operating room temperature.
    Materials Research Bulletin. 03/2013; 48(3):948–954.
  • Source
    Sang Woo Kim, Min Su Kim, Young Jin Jung
    [show abstract] [hide abstract]
    ABSTRACT: Chondrosarcoma is a very uncommon malignant primary bone tumor, especially, it occurs extremely rare in the spine. A 52-year-old man was admitted to the emergency room with sudden paraplegia. Twelve hours prior to a paraplegic event, he visited an outpatient clinic with discomfort and tenderness around the medial border of the right scapular, and his neurologic status was absolutely intact. Magnetic resonance imaging showed a lobulated soft tissue mass from T3 to T5, which extended to the epidural space. Computed tomography scans showed soft tissue mass on the spinal posterior arch and osteolytic change of the adjacent bony structures. Emergent surgery was performed and the lesion was removed. Dark reddish blood and gel-like material were encountered around the dura and posterior arch during the operation. Multiple pulmonary nodules were found on a chest CT scan and a biopsy of one of them had been proven to be a metastasis of chondrosarcoma. The histologic examination showed dedifferentiated chondrosarcoma. The patient's neurologic deficit was improved slowly from ASIA A to ASIA D. Chondrosarcoma in the spine is extremely rare, even more with acute hemorrhage and sudden expansion into the epidural space. We named it chondrosarcoma apoplexy. We should consider the possibility of a hemorrhagic event when the patient's neurologic deficit worsens suddenly with spinal bone tumor.
    Journal of Korean Neurosurgical Society 01/2013; 53(1):46-8. · 0.56 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: A normalized subband adaptive filter algorithm uses a fixed step size, which is chosen as a trade-off between the steady-state error and the convergence rate. In this letter, a variable step size for normalized subband adaptive filters is derived by minimizing the mean-square deviation between the optimal weight vector and the estimated weight vector at each instant of time. The variable step size is presented in terms of error variance. Therefore, the proposed algorithm is capable of tracking in non-stationary environments. The simulation results show good tracking ability and low misalignment of the proposed algorithm in system identification.
    IEEE Signal Processing Letters 12/2012; 19(12):906-909. · 1.67 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: In vitro and greenhouse screening of seven rhizobacterial isolates, AB05, AB10, AB11, AB12, AB14, AB15 and AB17, was conducted to investigate the plant growth promoting activities and inhibition against anthracnose caused by Colletotrichum acutatum in pepper. According to identification based on 16S rDNA sequencing, the majority of the isolates are members of Bacillus and a single isolate belongs to the genus Paenibacillus. All seven bacterial isolates were capable of inhibiting C. acutatum to various degrees. The results primarily showed that antibiotic substances produced by the selected bacteria were effective and resulted in strong antifungal activity against the fungi. However, isolate AB15 was the most effective bacterial strain, with the potential to suppress more than 50% mycelial growth of C. acutatumin vitro. Moreover, antibiotics from Paenibacillus polymyxa (AB15) and volatile compounds from Bacillus subtilis (AB14) exerted efficient antagonistic activity against the pathogens in a dual culture assay. In vivo suppression activity of selected bacteria was also analyzed in a greenhouse with the reference to their prominent in vitro antagonism efficacy. Induced systemic resistance in pepper against C. acutatum was also observed under greenhouse conditions. Where, isolate AB15 was found to be the most effective bacterial strain at suppressing pepper anthracnose under greenhouse conditions. Moreover, four isolates, AB10, AB12, AB15, and AB17, were identified as the most effective growth promoting bacteria under greenhouse conditions, with AB17 inducing the greatest enhancement of pepper growth.
    Mycobiology 12/2012; 40(4):244-51.
  • Source
    Sang Woo Kim, Jeong Hwan Choi
    [show abstract] [hide abstract]
    ABSTRACT: Cerebrospinal fluid (CSF) leakage otorrhea may be congenital or can be caused by trauma, surgery, cholesteatoma, and tumors. Spontaneous CSF leakage through the middle ear without a secondary cause is a relatively rare disease. The pathophysiology of CSF otorrhea has not been clear yet. However, there are two theories of the pathophysiology of spontaneous CSF otorrhea have been studied in the medical field: one based on the congenital defect; the other about the arachnoid granulation which causes bone erosion. Herein, we examine and report a case of CSF otorrhea caused by arachnoid granulation. Literatures pertaining to the disorder will be reviewed and characteristics of the disorder also will be discussed.
    Korean journal of audiology. 12/2012; 16(3):152-5.
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: Meningiomas represent 18-20% of all intracranial tumors and have a 20-50% 10-year recurrence rate, despite aggressive surgery and irradiation. Hydroxyurea, an inhibitor of ribonucleotide reductase, is known to inhibit meningioma cells by induction of apoptosis. We report the long-term follow-up result of hydroxyurea therapy in the patients with recurrent meningiomas. Thirteen patients with recurrent WHO grade I or II meningioma were treated with hydroxyurea (1000 mg/m(2)/day orally divided twice per day) from June 1998 to February 2012. Nine female and 4 male, ranging in age from 32 to 83 years (median age 61.7 years), were included. Follow-up assessment included physical examination, computed tomography, and magnetic resonance imaging (MRI). Standard neuro-oncological response criteria (Macdonald criteria) were used to evaluate the follow-up MRI scans. The treatment was continued until there was objective disease progression or onset of unmanageable toxicity. Ten of the 13 patients (76.9%) showed stable disease after treatment, with time to progression ranging from 8 to 128 months (median 72.4 months; 6 patients still accruing time). However, there was no complete response or partial response in any patients. Three patients had progressive disease after 88, 89, 36 months, respectively. There was no severe (Grade III-IV) blood systemic disorders and no episodes of non-hematological side effects. This study showed that hydroxyurea is a modestly active agent against recurrent meningiomas and can induce long-term stabilization of disease in some patients. We think that hydroxyurea treatment is well tolerated and convenient, and could be considered as an alternative treatment option in patients with recurrent meningiomas prior to reoperation or radiotherapy.
    Journal of Korean Neurosurgical Society 12/2012; 52(6):517-22. · 0.56 Impact Factor

Publication Stats

1k Citations
291.71 Total Impact Points

Institutions

  • 1995–2014
    • Pohang University of Science and Technology
      • • Department of Electronic and Electrical Engineering
      • • Department of Electrical and Computer Engineering
      Geijitsu, North Gyeongsang, South Korea
  • 2013
    • University of Ulsan
      • College of Medicine
      Ulsan, Ulsan, South Korea
  • 2009–2013
    • Kangwon National University
      • Department of Applied Plant Sciences
      Kang-neung, Gangwon, South Korea
    • Yeungnam University
      • Department of Neurosurgery
      Onyang, South Chungcheong, South Korea
    • Kyungpook National University Hospital
      Sŏul, Seoul, South Korea
  • 2004–2013
    • Korea Institute of Science and Technology
      • High Temperature Energy Materials Research Center
      Sŏul, Seoul, South Korea
  • 2012
    • Catholic University of Korea
      • Department of Internal Medicine
      Seoul, Seoul, South Korea
  • 2008–2010
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • Chung-Ang University
      • College of Pharmacy
      Sŏul, Seoul, South Korea
    • Chungnam National University
      • Department of Chemical Engineering
      Sŏngnam, Gyeonggi Province, South Korea
    • Dong-A University
      • Department of Electronics Engineering
      Pusan, Busan, South Korea
    • Chonbuk National University
      • School of Medicine
      Seoul, Seoul, South Korea
    • Chosun University
      • Department of Advanced Materials Engineering
      Goyang, Gyeonggi, South Korea
  • 2006–2009
    • Inje University Paik Hospital
      • Department of Laboratory Medicine
      Goyang, Gyeonggi, South Korea
  • 2002–2009
    • Daegu University
      • Department of Biotechnology
      Taegu, Daegu, South Korea
  • 2007
    • Inje University
      • College of Medicine
      Kimhae, South Gyeongsang, South Korea
  • 1989–2007
    • Seoul National University
      • Department of Electrical and Computer Engineering
      Sŏul, Seoul, South Korea
  • 2005
    • Cheongju University
      • Department of Electronic Engineering
      Sŏul, Seoul, South Korea
  • 2003
    • Konkuk University
      Sŏul, Seoul, South Korea
  • 2001–2002
    • Korea Advanced Institute of Science and Technology
      • Department of Chemistry
      Seoul, Seoul, South Korea
  • 1996
    • Korea University
      • Department of Materials Science and Engineering
      Seoul, Seoul, South Korea