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Park Soomin,Hisashi Kihara,Ken-ichi Abe 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.5
One of the problems relating to frost formation in the field of aviation is the effects of Cold Soaked Frost. It is hazardous problem for which various solutions are the responsibility of several aviation administrations. Owing to the lack of computational research on frost formation such as on a wing surface, an advanced model for predicting frost thickness under a various range of flow conditions was developed and validated in this study. In evaluating the growth rate of the solid layer, the relation between the partial vapor pressure and the saturation pressure was used to determine the supersaturation degree. Frost thickness was assumed on the basis that the mass transfer effects associated with the diffusivity of the vapor are related mainly to the growth rate of crystallization. We performed a favorable regression procedure to find constant values for the correlation of the growth rate. The proposed frost thickness model was validated through the comparison of the simulation results with various experimental data for the case of a flat plate. The results obtained using the proposed model agree satisfactorily with the experimental data.
Park, Soomin,Kim, Esther Hehsun,Eoel, Moonjung,Song, Hyeon Don,Lee, Suseung,Roh, Jin-Kyu,Lee, Byoung-Cheun,Kim, Younghun,Yi, Jongheop American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.3
<P>Although little is known about the behavior of engineered nanomaterials after exposure to terrestrial areas, recent studies indicate that silver nanoparticles (AgNPs) can perturb the soil environment due to their biocidal and catalytic properties. The fundamental evaluation of the environmental fate of AgNPs would be a significant step toward a comprehensive understanding of the harmful effects of such particles on ecosystems. Therefore, from an eco-toxicological perspective, the estimation of AgNP behavior in soil should be investigated. Among the various environmental characteristics, the deposition of nanoparticles in the soil constitute is a critical step in their migration into surface or groundwater and interaction with organisms, which is determined by the stability of aqueous dispersions in a soil micro-environment. In the present study, we observed the aggregation and deposition of AgNPs to natural soil surfaces by comparing the partitioning of AgNPs in a soil/water interface with that of Ag+ ion. Both AgNPs and Ag+ ion were selectively quantified by means of inductively coupled plasma (ICP) spectrometry and an ion-selective electrode (ISE). We interpreted the partitioning of AgNPs and Ag+ ion using the Freundlich isotherm and the findings indicate that AgNPs with reduced dispersion stability in a soil micro-environment were aggregated and deposited on the surface of natural soil. This study provides a fundamental basis for understanding the deposition of AgNPs, which will enable their accumulation and mobility in a soil environment to be predicted.</P>
Park, Soomin 신영어영문학회 2021 신영어영문학 Vol.78 No.-
This study was performed to find out the significant metaphtonymies of FEAR in English with quantitative analysis as a Corpus-based study. To identify the significant metaphtonymies of FEAR from the synchronic view, the data was extracted from COCA and analyzed in the light of Metaphtonymy with the statistics such as the relative frequency (FPR) and the standard error (SE). By analyzing metaphtonymies, it is natural that metaphtonymies are divided into metaphor from metonymy and metonymy within metaphor as per two types of source data. With the comparison between FPR and SE in each metaphtonymy, the general metaphtonymy of FEAR with significant value can be drawn out.
Rapidly resolved IgG4-related retroperitoneal fibrosis after steroid pulse therapy
( Soomin Jeung ),( Hyosang Kim ),( Yuri Seo ),( Hee-young Yoon ),( Nah Kyum Lee ),( Shinhee Park ),( Bomi Seo ),( Su-yeon Park ),( Su-kil Park ) 영남대학교 의과대학 2016 Yeungnam University Journal of Medicine Vol.33 No.1
Retroperitoneal fibrosis (RF) is a disorder characterized by the presence of a retroperitoneal mass and concurrent systemic inflammation. Some cases of RF are recognized as belonging to the spectrum of immunoglobulin G4-related disease (IgG4-RD). Glucocorticoids are highly effective for treatment of retroperitoneal fibrosis, although the optimal dose and duration of therapy have not been established. An initial dose of prednisone (40-60 mg) daily is usually administered with a tapering scheme. We report on a 55-year-old man diagnosed with IgG4-related RF and successfully treated with a 3-day course of daily 250 mg (4 mg/kg) intravenous methylprednisolone, which resulted in the prompt resolution of urinary obstruction and systemic symptoms.
Park, Junsu,Kim, Gil-Pyo,Nam, Inho,Park, Soomin,Yi, Jongheop IOP Pub 2013 Nanotechnology Vol.24 No.2
<P>Silicon nanoparticles trapped in an ordered mesoporous carbon composite were prepared by a one-step self-assembly with solvent evaporation using the triblock copolymer Pluronic F127 and a resorcinol–formaldehyde polymer as the templating agent and carbon precursor respectively. Such a one-pot synthesis of Si/ordered mesoporous carbon nanocomposite is suitable for large-scale synthesis. Characterization confirmed that the Si nanoparticles were trapped in the ordered mesoporous carbon, as evidenced by transmission electron microscopy, x-ray diffraction analysis and nitrogen sorption isotherms. The composite showed a high reversible capacity above 700 mA h g<SUP>−1</SUP> during 50 cycles at 2 A g<SUP>−1</SUP>. The improved electrochemical performance of the composite can be ascribed to the buffering effect of spaces formed in the ordered pore channels during the volume expansion of silicon and the rapid movement of lithium ions through the uniform cylindrical pore structure of the mesopores.</P>
Prediction and Evaluation of Frosting Surface on Cylindrical Structure Using Growth Rate Model
Park Soomin,Hisashi Kihara,Ken-ichi Abe 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.1
Icing and frosting on a surface can cause critical degradation in mechanical performance. In the aviation and astronautical fields, lots of accidents and safety issues have been attributed to this problem. Various prediction models for frost formation have been developed to address this issue. In the present study, we apply a newly developed model to numerical prediction of frost formation on a cylindrical surface. The proposed model in the present study is based on the growth rate from the Arrhenius formula considering Gibbs free energy term with the entropy difference. The overall frost properties are calculated using the correlation for the diffusivity of vapor in humid air. The approach is validated by comparing the computational results with the experimental data obtained from previous literatures. The results generally show similar trends to the measurement data. It is expected that a better treatment for the heat and mass balances in the early period of the growth would rectify the discrepancy between the measurements and the computation. The predicted results are within an error range of ± 25%, and thus the present model is expected to be applicable not only to a flat surface but also to more complex surfaces with curvature.