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심병섭,정대호,김환용 원광대학교 공업기술개발연구소 2003 工業技術開發硏究誌 Vol.23 No.-
In this paper, it proposes the efficient iterative decoding stop criterion using the variance value of LLR. It is venfying that the proposal iterative decoding stop criterion can be reduced the average iterative decoding number compared to conventional schemes with a negligible degradation of the error performance. The proposal algorithm and hardware synthesize to use the Synopsys Tool, performance validations perform through the ModelSim.
탄소섬유의 CVD-SiC 증착특성에 미치는 CH₃SiCl₃대 H₂의 비율의 영향
박병배,심환보,이보성,이영석,김종환 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
Chemical vapor deposition of SiC on carbon fibers was investigated to improve oxidation resistance of carbon fibers, which was performed at the horizontal hot-wall reactor using the reactant mixtures of CH₃SiCl₃and H₂ with carrier gas Ar. The chemical composition, oxidation resistance, and tensile strength of SiC-coated carbon fiber were investigated as functions of CH₃SiCl₃/H₂ ratio, reaction temperature, coating thickness, and so on. The composition of deposited layer revealed C rich β-SiC at low hydrogen concentration and Si rich β-SiC at high hydrogen concentration. Because Si rich β-SiC layer is easy to be converted into SiO₂ favorable to oxidation resistance, high input value of H₂/CH₃SiCl₃ mole ratio resulted in good oxidation resistance in the SiC coating layer of carbon fibers.
이홍식,지환욱,심재설 中央大學校 建設環境硏究所 1997 環境科學硏究 Vol.8 No.-
A numerical model is presented for the prediction of wave height distribution in a harbor due to the linear wave theory. The method is based upon the solution of a time-dependent analysis including wave refraction, diffraction, and arbitrary reflection coefficient by the finite difference approach. The present numerical model has been validated in several stages. The result obtained from wave shoaling effect has been compared with hydraulic experimental result presented by Ito and Tanimoto. The portion of the diffracted wave heights in a harbor has also been compared with the experimental works proposed by Nisimura et. al.. Good agreement was obtained between the present model and previously obtained results. Therefore it is concluded that the model can be applied to predict the wave height distribution in a harbor with varying depth and arbitrary reflection coefficients. Finally, a numerical example of this application for the Hwa-Sun harbor is shown.
Gas-Flow Sensor using Optical Fiber Bragg Grating(FBG)
Shim, Joon-Hwan,Cho, Seok-Je,Yu, Yung-Ho,Sohn, Kyung-Rak Korean Institute of Navigation and Port Research 2008 한국항해항만학회지 Vol.32 No.9
We have proposed and demonstrated an gas-flow sensor using optical fiber bragg grating(FEG). The flow sensor has no electronics and no mechanical parts in its sensing part and the structure is th11s simple and immune to electromagnetic interference(EMI). The FEG sensor was consisted qf the sensing element and a coil heater. The metal coil was used to supply the current to the FEG. While some currents supply to the coil, the refractive index of the FEG under the coil is changed and thus the wavelength shift of fiber optic sensor was induced In this work, the wavelength shift according to flow-rate was experimentally studied and was used to evaluate the gas flow-rate in a gas tube. As a result, it was possible to measure the flow-rate in a linear range from 5 to $20{\ell}/min$ with a resolution of approximately $1{\ell}/min$ at the applied currents of 100 mA and 120 mA. The measured sensitivities were $15.3\;pm/\ell/min$ for 100 mA and $20.2\;pm/\ell/min$ for 120 mA.
Anti-inflammatory and radical scavenging properties of Verbena officinalis
Hwan Ki Shim,Seong Yeol Kim,Borim Kim,Jae Park Cho,Yae Jeong Park,Won Geun Ji,차동석,전훈 경희대학교 융합한의과학연구소 2010 Oriental Pharmacy and Experimental Medicine Vol.10 No.4
Verbena officinalis (Verbenaceae) has been used as herbal medicine or health supplement in both Western and Eastern countries for centuries. In the present study, we examined the antiinflammatory and antioxidant activities of the methylene chloride fraction of V. officinalis (VMC). To elucidate the anti-inflammatory properties of VMC, we investigated the inhibition effects of nitric oxide production in interferon-gamma (IFN-γ) and lipopolysaccharide-stimulated mouse peritoneal macrophages. VMC suppressed nitric oxide production, inducible nitric oxide synthase and cyclooxygenase-2 expression dose-dependently without notable cytotoxicity. In various radical scavenging assays, VMC exhibited strong scavenging effect on DPPH radical, superoxide radical,nitric oxide radical and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) radical. VMC also showed potent reducing power. These findings strongly suggest that VMC may be beneficial in oxidative stress-mediated inflammatory disorders.
Pediatric Eosinophilic Granuloma in the Skull after Minor Head Trauma: A Case Report
Shim Hwan Seok,Shin Hee Sup,Lee Seung Hwan,Koh Jun Seok,Ko Hak Cheol 대한말초신경학회 2020 The Nerve Vol.6 No.2
Here, we report a case of eosinophilic granuloma (EG) of the skull in a pediatric patient after minor head trauma without hemorrhage or fracture. A 15-year-old boy presented with a soft mass on the left side of his forehead. The mass was 2 cm in size and was associated with tenderness. It had grown rapidly in 1month. He had been hit by a baseball on the left side of his forehead 9 months before. Cerebral computed tomography revealed a 2-cm-sized mass in the frontal bone region on the left side with a lytic bony defect. This mass was wellenhanced on cerebral magnetic resonance imaging, and the margin was well-demarcated without intracerebral infiltration. The mass was removed surgically. Total excision was performed through craniectomy around the mass, and the bony defect was reconstructed using bone cement. Three years postoperatively, there was no local or distant recurrence. Minor trauma without hemorrhage or fracture can trigger the development of EG. In pediatric patients, clinicians should be aware of a possible association between solitary EG of the skull and minor head trauma.
Analysis of zinc oxide nanoparticles binding proteins in rat blood and brain homogenate
Shim, Kyu Hwan,Hulme, John,Maeng, Eun Ho,Kim, Meyoung-Kon,An, Seong Soo A Dove Medical Press 2014 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.9 No.2
<P>Nanoparticles (NPs) are currently used in chemical, cosmetic, pharmaceutical, and electronic products. Nevertheless, limited safety information is available for many NPs, especially in terms of their interactions with various binding proteins, leading to potential toxic effects. Zinc oxide (ZnO) NPs are included in the formulation of new products, such as adhesives, batteries, ceramics, cosmetics, cement, glass, ointments, paints, pigments, and supplementary foods, resulting in increased human exposures to ZnO. Hence, we investigated the potential ZnO nanotoxic pathways by analyzing the adsorbed proteins, called protein corona, from blood and brain from four ZnO NPs, ZnO<SUP>SM20(−)</SUP>, ZnO<SUP>SM20(+)</SUP>, ZnO<SUP>AE100(−)</SUP>, and ZnO<SUP>AE100(+)</SUP>, in order to understand their potential mechanisms in vivo. Through this study, liquid chromatography–mass spectroscopy/mass spectroscopy technology was employed to identify all bound proteins. Totals of 52 and 58 plasma proteins were identified as being bound to ZnO<SUP>SM20(−)</SUP> and ZnO<SUP>SM20(+)</SUP>, respectively. For ZnO<SUP>AE100(−)</SUP> and ZnO<SUP>AE100(+)</SUP>, 58 and 44 proteins were bound, respectively. Similar numbers of proteins were adsorbed onto ZnO irrespective of size or surface charge of the nanoparticle. These proteins were further analyzed with ClueGO, a Cytoscape plugin, which provided gene ontology and the biological interaction processes of identified proteins. Interactions between diverse proteins and ZnO nanoparticles could result in an alteration of their functions, conformation, and clearance, eventually affecting many biological processes.</P>