Sang Woo Kim

Catholic University of Korea, Sŏul, Seoul, South Korea

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Publications (341)712.49 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Affine projection sign algorithm (APSA) is a useful adaptive filter for a highly correlated input signal in the presence of impulsive noise. In this study, a novel variable step-size APSA is proposed using selective input vectors to achieve both fast convergence rate and low steady-state mean-square deviation (MSD) with low computational cost. The selective input vectors and step size are chosen so as to maximize the theoretical MSD difference derived using Price׳s theorem. The simulation results show that the proposed algorithm has the fastest convergence rate and lowest steady-state MSD when compared with recent variable step-size APSAs. Moreover, it effectively reduces computational cost.
    Signal Processing 10/2015; 115. DOI:10.1016/j.sigpro.2015.04.005 · 2.24 Impact Factor
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    ABSTRACT: We report the fabrication of nickel nanofiber catalysts supported on nickel metallic foam using a modified electrospinning with a grounded rotor and sequential reduction process. The robust deposition of aligned Ni nanofibers with a uniform morphology on the highly porous surfaces of the metallic foam could be achieved by controlling electrospinning parameters such as applied voltage, tip-collector-distance (TCD), concentration of polymer, and humidity. The diameters of the obtained nanofibers decreased with increasing voltage and TCDs. The uniform and thinnest Ni nanofibers on the Ni foam were obtained at a humidity of less than 30%, 15 kV applied voltage, and 17 cm TCD when using a precursor composed of nickel nitrate salt and poly(vinyl) pyrrolidone. The Ni foam catalyst support exhibited the superior thermal conducting property than other supports of MgO–MgAl2O4, Al2 O3, and SiC, enabling to a higher heat transfer during catalytic reaction. As a result, the Ni nanofiber catalyst with a high surface area and superior heat transfer performance, which is supported on the metallic foam, were successfully fabricated via a modified electrospinning for potential application of XTL process converting anything to liquids, such as for Gas-to-Liquid (GTL), Coal-to-Liquid (CTL), and Biomass-to-Liquid (BTL).
    Journal of Nanoscience and Nanotechnology 07/2015; 15(7). DOI:10.1166/jnn.2015.10414 · 1.34 Impact Factor
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    ABSTRACT: Prohibitin (PHB) is a ubiquitously expressed and highly conserved protein that participates in diverse cellular processes, and its functions are linked to a variety of diseases. In the present study, to explore transcriptional activation and signaling pathways involved in PHB regulation in response to sex hormone treatment, we investigated the effects of estrogen (17-β-estradiol, E2) on regulation of PHB in several metabolic tissues from male and female rats. Elevated expression of PHB was prominent in white adipose tissue (WAT) and the liver, and E2 stimulated PHB expression in both ND and HFD-fed rats. To further confirm the expression of PHB which was increased in WAT and the liver, we analyzed PHB expression levels in 3T3-L1 and C9 cells after the treatment of E2. Transcription and protein levels of PHB were dose-dependently increased by E2 treatment in both cell types, supporting our in vivo data. To further evaluate the possible role of E2 in elevation of PHB via estrogen receptors (ER), the potent ER inhibitor fulvestrant was treated to 3T3-L1 and C9 cells. Fulvestrant markedly suppressed both transcription and protein levels of PHB, suggesting that PHB expression in both tissues may be regulated through ERs. GeneMANIA, a predictive web interface, was used to show that Phb is regulated via the intracellular steroid hormone receptor signaling pathway, suggesting a role for ERs in expression of Phb as well as other metabolically important genes. Based on these results, we expect that targeting PHB would be a useful therapeutic approach for treatment of obesity.
    Molecular and Cellular Biochemistry 06/2015; DOI:10.1007/s11010-015-2468-1 · 2.39 Impact Factor
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    ABSTRACT: S.‐W. Kim and co‐workers report a novel highly sensitive piezoelectric nanogenerator (PNG) for self‐powered pressure sensors based on a micro‐patterned piezoelectric polymer P(VDF‐TrFE) thin film. The micro‐structured PNGs presented on page 3203 has five times larger output power compared to the flat film‐based PNG. The micro‐structured PNG shows high sensitivity and mechanical durability under various circumstances such as rain drop and wind blow.
    Advanced Functional Materials 06/2015; 25(21). DOI:10.1002/adfm.201570145 · 10.44 Impact Factor
  • 04/2015; 39(2):513-520. DOI:10.17779/KAOMP.2015.39.2.513
  • 04/2015; 39(2):525-530. DOI:10.17779/KAOMP.2015.39.2.525
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    ABSTRACT: For afternoon colonoscopy, same-day administration of sodium picosulfate, magnesium oxide, and citric acid (PM/Ca) is recommended. However, few studies have evaluated the bowel-cleansing efficacy and safety of this regimen. The aim of this study was to compare the bowel-cleansing efficacy, side effects, and patient's tolerability of a same-day split administration of PM/Ca with polyethylene glycol (PEG) for afternoon colonoscopy.Patients were randomly assigned to a PM/Ca group or a PEG group. The PM/Ca group consumed 1 sachet of PM/Ca at 06:00 and 1 sachet of PM/Ca 4 hours before the colonoscopy. They also took 2 tablets of bisacodyl before sleep on the night before. The PEG group consumed 2 L of PEG at 06:00 and 2 L of PEG 4 hours before the colonoscopy. All subjects were instructed to finish the bowel cleanser or fluid at least 2 hours before colonoscopy. All colonoscopic examinations were performed in the afternoon on the same day. The bowel-cleansing efficacy was scored using 2 scales: the Ottawa Bowel Preparation Scale (OBPS) and the Aronchick scale. Ease of using the bowel cleanser was rated from 1 (very easy) to 5 (very difficult).Two hundred nine patients underwent colonoscopy. The bowel-cleansing scores by OBPS did not differ between groups (5.0 vs 4.9, P = 0.63). Ease of using the bowel cleanser was superior in the PM/Ca group (P < 0.01).The cleansing efficacy of PM/Ca administered on the day of colonoscopy is comparable to that of PEG. Patients prefer PM/Ca.
    Medicine 04/2015; 94(13):e628. DOI:10.1097/MD.0000000000000628 · 4.87 Impact Factor
  • Sang Woo Kim, Kuk Young Cho
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    ABSTRACT: With increasing interest in flexible electronic devices and wearable appliances, flexible lithium ion batteries are the most attractive candidates for flexible energy sources. During the last decade, many different kinds of flexible batteries have been reported. Although research of flexible lithium ion batteries is in its earlier stages, we have found that developing components that satisfy performance conditions under external deformation stress is a critical key to the success of flexible energy sources. Among the major components of the lithium ion battery, electrodes, which are connected to the current collectors, are gaining the most attention owing to their rigid and brittle character. In this mini review, we discuss candidate materials for current collectors and the previous strategies implemented for flexible electrode fabrication.
    03/2015; 6(1):1-6. DOI:10.5229/JECST.2015.6.1.1
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    ABSTRACT: Background When patients using the Ilizarov device need a free-flap procedure for their thigh and leg, it is difficult to isolate the major vessels as the recipient vessel due to the limited working space around the Ilizarov rings and pins. The usefulness of a perforator as the recipient vessel to allow minimally invasive surgery was investigated in this study. Methods Between October 2011 and December 2013, 77 patients using the Ilizarov device needed free flap reconstruction using an anterolateral thigh perforator flap or superficial circumflex iliac artery perforator flap. The perforator was used as a recipient vessel in 50 cases, with which end-to-end anastomosis was performed using a perforator-to-perforator approach, and major vessels were used as a recipient vessel in 27 cases (n = 20, anterior tibial vessel; n = 7, posterior vessel). Results When the perforator was used as the recipient vessel, total loss developed in one case and marginal necrosis in four cases. When the major vessel was used as the recipient vessel, whole necrosis developed in one case and marginal necrosis in two cases. The procedure increased the freedom of hand movement, decreased the recipient vessel dissection time, and reduced the recipient dissection scar. Conclusions The use of perforators as recipients overcomes the obstacles associated with the Ilizarov device and allows convenient and rapid reconstruction, with similar success as microsurgery using major vessels. Further studies are needed to address the limitations of this approach, which include perfusion physiology and the viable limit of the flap dimension. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Journal of Reconstructive Microsurgery 03/2015; DOI:10.1055/s-0035-1548549 · 1.01 Impact Factor
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    ABSTRACT: One of the most interesting issues in obesity research is why certain humans are obesity-prone (OP) while others are obesity-resistant (OR) upon exposure to a high-calorie diet. However, the pathways responsible for these phenotypic differences are still largely unknown. In order to discover marker molecules determining susceptibility and/or resistance to obesity in response to high fat diet (HFD) or anti-obesity herbal medicine (TH), we conducted comparative proteomic analysis of white adipose tissue (WAT) from OP, OR, as well as TH-treated mice. OP mice fed HFD gained approximately 33% more body weight than OR mice, and TH significantly reduced body weight gain in HFD-fed mice by 30%. These mice were further subjected to proteomic analysis using two-dimensional electrophoresis (2-DE) combined with matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF-MS). Proteomic data revealed 59 spots that were differentially regulated from a total of 1,045 matched spots, and 57 spots of these were identified as altered WAT proteins between OP and OR mice by peptide mass finger printing. Interestingly, 45 proteins were similarly regulated in OR mice in response to TH treatment. Of these, 10 proteins have already been recognized in the context of obesity; however, other proteins involved in obesity susceptibility or resistance were identified for the first time in the present study. Our results suggest that TH actively contributed to body weight reduction in HFD-fed obese mice by altering protein regulation in WAT, and it was also found that TH-responsive proteins can be used as potent molecules for obesity treatment. © 2015 S. Karger AG, Basel.
    Cellular Physiology and Biochemistry 03/2015; 35(4):1482-1498. DOI:10.1159/000373967 · 3.55 Impact Factor
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    Ikchan Jeon, Sang Woo Kim
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    ABSTRACT: Posterior vertebral translation as a type of spondylolisthesis, retrolisthesis is observed commonly in patients with degenerative spinal problems. Nevertheless, there is insufficient literature on retrolisthesis compared to anterolisthesis. The purpose of this study is to clarify the clinical features of retrolisthesis, and its developmental mechanism associated with a compensatory role in sagittal imbalance of the lumbar spine. From 2003 to 2012, 230 Korean patients who underwent spinal surgery in our department under the impression of degenerative lumbar spinal disease were enrolled. All participants were divided into four groups : 35 patients with retrolisthesis (group R), 32 patients with simultaneous retrolisthesis and anterolisthesis (group R+A), 76 patients with anterolisthesis (group A), and 87 patients with non-translation (group N). The clinical features and the sagittal parameters related to retrolisthesis were retrospectively analyzed based on the patients' medical records. There were different clinical features and developmental mechanisms between retrolisthesis and anterolisthesis. The location of retrolisthesis was affected by the presence of simultaneous anterolisthesis, even though it predominantly manifest in L3. The relative lower pelvic incidence, pelvic tilt, and lumbar lordosis compared to anterolisthesis were related to the generation of retrolisthesis, with the opposite observations of patients with anterolisthesis. Retrolisthesis acts as a compensatory mechanism for moving the gravity axis posteriorly for sagittal imbalance in the lumbar spine under low pelvic incidence and insufficient intra-spinal compensation.
    Journal of Korean Neurosurgical Society 03/2015; 57(3):178-84. DOI:10.3340/jkns.2015.57.3.178 · 0.52 Impact Factor
  • 02/2015; 39(1):403-412. DOI:10.17779/KAOMP.2015.39.1.403
  • 02/2015; 39(1):441-446. DOI:10.17779/KAOMP.2015.39.1.441
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    ABSTRACT: Regulation of DJ1 is associated with a number of human diseases. To determine the involvement of DJ1 in progression of diabetes in a gender-dependent manner, we investigated its tissue-specific expression in streptozotocin (STZ)-induced diabetic male and female rats in this study. In animal experiments, females showed greater susceptibility towards developing diabetes because of lower insulin secretion and higher blood glucose levels as compared to male diabetic rats upon exposure to STZ. Immunoblotting confirmed sexually dimorphic regulation of DJ1 in various metabolic tissues such as the liver, pancreas and skeletal muscle. Immunofluorescence analysis revealed the location as well as reinforced the gender-dependent expression of DJ1 in hepatic tissue. Co-immunoprecipitation assay identified several interacting proteins with DJ1 whose functions were shown to be involved in various metabolic pathways viz. antioxidative and stress defence system, protein and methionine metabolism, nitrogen metabolism, urea metabolism, etc. Using GeneMANIA, a predictive web interface for gene functions, we showed for the first time that DJ1 may regulate T1DM via the JNK1 pathway, suggesting DJ1 interacts with other proteins from various metabolic pathways. We anticipate that the current data will provide insights into the aetiology of T1DM. © 2015 The Authors. Journal of Cellular and Molecular Medicine published by John Wiley & Sons Ltd and Foundation for Cellular and Molecular Medicine.
    Journal of Cellular and Molecular Medicine 02/2015; 19(5). DOI:10.1111/jcmm.12490 · 3.70 Impact Factor
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    ABSTRACT: Traumatic diaphragm hernia can occur in rare cases and generally accompanies thoracic or abdominal injuries. When suffering from ankylosing spondylitis, a small force can develop into vertebral fracture and an adjacent structural injury, and lead to diaphragm hernia without accompanying concomitant thoracoabdominal injury. A high level of suspicion may be a most reliable diagnostic tool in the detection of a diaphragm injury, and we need to keep in mind a possibility in a patient with ankylosing spondylitis and a thoracolumbar fracture, even in the case of minor trauma.
    Journal of Korean Neurosurgical Society 02/2015; 57(2):131-4. DOI:10.3340/jkns.2015.57.2.131 · 0.52 Impact Factor
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    Su Jin Hong, Sang Woo Kim
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    ABSTRACT: Helicobacter pylori infection, a common infection in many countries, is related to the clinical course of upper gastrointestinal diseases. Gastroesophageal reflux disease (GERD) is a common esophageal disease in Western countries and its prevalence is increasing in Asian countries. The pathophysiology of GERD is multifactorial. Although no single factor has been isolated as the cause of GERD, a negative association between the prevalence of H. pylori and the severity of GERD, including Barrett's esophagus, has been demonstrated in epidemiological studies. The high prevalence of H. pylori infection affects the incidence of GERD in Asian countries. In the subjects with East Asian CagA-positive strains, acid injury may be minimized by hypochlorhydria from pangastritis and gastric atrophy. Additionally, host genetic factors may affect the development of GERD. The interactions between genetic factors and the virulence of H. pylori infection may be the reason for the low prevalence of GERD in Asian countries. H. pylori eradication is not considered pivotal in GERD exacerbation based on evidence from Western studies. A recent meta-analysis demonstrated that eradication therapy of H. pylori was related to a higher risk of developing de novo GERD in Asian studies. H. pylori infection remains an inconclusive and important issue in GERD in Asian countries.
    Gastroenterology Research and Practice 01/2015; 2015:985249. DOI:10.1155/2015/985249 · 1.50 Impact Factor
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    ABSTRACT: A new minimization criterion for the normalized subband adaptive filter (NSAF), which is called improved NSAF (INSAF), was introduced recently to improve the performance of the steady-state mean-square deviation (MSD). However, the steady-state MSD analysis of the INSAF was not studied. Therefore, this paper proposes a general solution of steady-sate MSD analysis of the INSAF algorithm, which is based on the substitution of the past weight error vector in the weight error vector. The simulation shows that our theoretical results correspond closely with the computer simulation results in various environments.
    Signal Processing 01/2015; 106:49–54. DOI:10.1016/j.sigpro.2014.06.026 · 2.24 Impact Factor
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    ABSTRACT: A series of Cu–ZnO–Al2O3 catalysts were prepared by coprecipitation method. The pH of solution was adjusted from 6 to 8 by using Na2CO3 solution. The prepared catalysts were evaluated for methanol synthesis from syngas (H2, CO and CO2) at lower temperature and pressures. Catalysts have been characterized by N2 physisorption, porosity measurements, XRD, TG/DTA, TPD (CO2/NH3) and XPS. Among all the catalysts pH 7 catalyst was shown higher catalytic activity towards methanol formation. It was found that the catalyst is mainly possessed the higher number of surface active sites (Cu0/Cu+), acidic and basic nature and optimum synergism between three components (Cu–ZnO–Al2O3). The activity results were evaluated with and without CO2 in syngas and it was found that higher CO conversion and higher methanol selectivity in the presence CO2.
    Journal of Nanoscience and Nanotechnology 01/2015; 15(1). DOI:10.1166/jnn.2015.8352 · 1.34 Impact Factor
  • Sang Woo Kim, Hyun-seok Choi, Kyung-sub Lee
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    ABSTRACT: In this work, we investigate the thermal conductivity of a three-component composite consisting of FeCr metal core-aluminum oxide shell particles with a highly mesoporous shell layer. This composite showed highly enhanced thermal conductivity compared to typical two-component composites consisting of uni-modal particles. The improved thermal conductivity was found to be the result of excellent thermal contact conductance through the shell layer between the core particle surface and the continuous polymer medium. There was no effect from the enhancement of the thermal conductivity in the shell layer itself because the predicted thermal conductivity of the shell layer is significantly reduced by phonon scattering at the boundaries of the nanocrystals of a size less than a phonon mean free path in the alumina in the shell layer containing a columnar-like pore morphology. The thermal conductivity of the three-component composites containing core-shell particles with a nanostructured shell layer was well predicted from the modified core-shell percolation theory, which considered the effects of phonon scattering and pores.
    Materials Research Bulletin 12/2014; 60:843-848. DOI:10.1016/j.materresbull.2014.09.079 · 2.29 Impact Factor
  • Advanced Functional Materials 11/2014; 24(44). DOI:10.1002/adfm.201470288 · 10.44 Impact Factor

Publication Stats

3k Citations
712.49 Total Impact Points

Institutions

  • 2010–2015
    • Catholic University of Korea
      • • Department of Internal Medicine
      • • College of Medicine
      Sŏul, Seoul, South Korea
    • POSCO E&C
      Urusan, Ulsan, South Korea
    • Hoseo University
      Onyang, Chungcheongnam-do, South Korea
  • 2009–2015
    • Yeungnam University
      • Department of Neurosurgery
      Gyeongsan, Gyeongsangbuk-do, South Korea
    • Ulsan University Hospital
      Urusan, Ulsan, South Korea
    • Seoul Veterans Hospital
      Sŏul, Seoul, South Korea
    • Seoul National University of Science and Technology
      Sŏul, Seoul, South Korea
    • Howard Hughes Medical Institute
      Ashburn, Virginia, United States
    • Pusan National University
      Tsau-liang-hai, Busan, South Korea
    • Kyungpook National University Hospital
      Sŏul, Seoul, South Korea
  • 2004–2015
    • Korea Institute of Science and Technology
      • • Clean Energy Research Center
      • • High Temperature Energy Materials Research Center
      Sŏul, Seoul, South Korea
    • Hankuk University of Foreign Studies
      • Department of Chemistry
      Sŏul, Seoul, South Korea
  • 2002–2015
    • Daegu University
      • Department of Biotechnology
      Daikyū, Daegu, South Korea
  • 1992–2015
    • Pohang University of Science and Technology
      • • Department of Electronic and Electrical Engineering
      • • Department of Electrical and Computer Engineering
      Geijitsu, North Gyeongsang, South Korea
  • 2014
    • Gyeongsang National University
      Shinshū, Gyeongsangnam-do, South Korea
    • Kongju National University
      Gongju, Chungcheongnam-do, South Korea
  • 2013–2014
    • Brown University
      • Department of Neuroscience
      Providence, Rhode Island, United States
    • Yonsei University
      • Department of Chemical and Biomolecular Engineering
      Sŏul, Seoul, South Korea
  • 2012–2014
    • Sungkyunkwan University
      • School of Advanced Materials Science and Engineering (AMSE)
      Sŏul, Seoul, South Korea
    • Gyeongnam National University of Science and Technology
      Sŏul, Seoul, South Korea
  • 2010–2014
    • University of Ulsan
      • College of Medicine
      Urusan, Ulsan, South Korea
  • 2009–2013
    • Kangwon National University
      • Department of Applied Plant Sciences
      Kang-neung, Gangwon, South Korea
  • 2005–2012
    • Inje University
      • College of Medicine
      Kŭmhae, Gyeongsangnam-do, South Korea
    • Kyungpook National University
      • Advanced Display Manufacturing Research Center
      Daikyū, Daegu, South Korea
  • 2011
    • Chonnam National University
      • Department of Pathology
      Gwangju, Gwangju, South Korea
  • 2009–2010
    • University of Pittsburgh
      Pittsburgh, Pennsylvania, United States
  • 2008–2010
    • Chung-Ang University
      • College of Pharmacy
      Sŏul, Seoul, South Korea
    • Chosun University
      • Department of Advanced Materials Engineering
      Gwangju, Gwangju, South Korea
    • Chonbuk National University
      • School of Medicine
      Seoul, Seoul, South Korea
  • 2005–2010
    • Inje University Paik Hospital
      • Department of Pediatrics
      Sŏul, Seoul, South Korea
  • 2007–2008
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
    • Dongguk University
      Sŏul, Seoul, South Korea
    • Dong-A University
      • Department of Electronics Engineering
      Tsau-liang-hai, Busan, South Korea
  • 2002–2008
    • Chungnam National University
      • Department of Chemical Engineering
      Sŏngnam, Gyeonggi Province, South Korea
  • 2005–2006
    • Chungbuk National University
      • Department of Electronic Engineering
      Chinsen, Chungcheongbuk-do, South Korea
  • 1989–2003
    • Seoul National University
      Sŏul, Seoul, South Korea
  • 2001
    • Korea Advanced Institute of Science and Technology
      • Department of Chemistry
      Seoul, Seoul, South Korea
    • Hannam University
      • Department of Chemistry
      Daiden, Daejeon, South Korea
  • 1996
    • Korea University
      • Department of Materials Science and Engineering
      Seoul, Seoul, South Korea