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Study on the Effect of Deep Seawater Salt on Biological Activities and Immune Function
신세계,최윤희 강원대학교 농업생명과학연구원 2023 강원 농업생명환경연구 Vol.35 No.4
In this study, we investigated the potential health effects of deep seawater salt (DS) compared to those of solar-dried salt, focusing on its anti-inflammatory properties. We found that the DS had a higher pH and reduction potential and contained more OH groups than the solar-dried salt. Additionally, the analysis of DS using ICP-MS revealed that it had the highest percentage of calcium (Ca) % and magnesium (Mg) % contents among the minerals examined. We also examined the impact of deep-seawater salt on nitric oxide (NO) production and the expression of pro-inflammatory mediators, such as inducible nitric oxide synthase (iNOS) and cyclooxygenase 2 (COX-2). DS decreases NO production and increases the expression of iNOS and COX-2, indicating its potential anti-inflammatory effects. These results demonstrated the potential anti-inflammatory and immune-enhancing effects of deep-seawater salts. These effects were attributed to reduced NO production and increased iNOS and COX-2 expression. Various minerals in deep seawater, particularly those with high calcium concentrations, are believed to be responsible for these effects. In addition, components such as K are thought to contribute to the observed outcomes. Further research into the interactions between deep-seawater salts and other components is expected to facilitate the development of excellent salt products.
Enhancing tube hydroformability by reducing the local strain gradient at potential necking sites
신세계로,B. D. Joo,C. J. Van Tyne,문영훈 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
Bursting in tube hydroforming is preceded by localized deformation, which is often called necking. The retardation of the initiation ofnecking is a means to enhance hydroformability. Since high strain gradients occur at necking sites, a decrease in local strain gradients isan effective way to retard the initiation of necking. In the current study, the expansion at potential necking sites was intentionally restrictedin order to reduce the strain gradient at potential necking sites. From the strain distribution obtained from FEM, it is possible todetermine strain concentrated zones, which are the potential necking sites. Prior to the hydroforming of a trailing arm, lead patch is attachedto the tube where the strain concentration would occur. Due to the incompressibility of lead, the tube expansion is locally restricted,and the resultant strain extends to adjacent regions of the tube during hydroforming. After the first stage of hydroforming, thelead is removed from the tube, and the hydroforming continues to obtain the targeted shape without the local restriction. This method wassuccessfully used to fabricate a complex shaped automotive trailing arm that had previously failed during traditional hydroforming processing.
신세계로(S. G. R. Shin),주병돈(B. D. Joo),이철환(C. H. Lee),김동우(D. W. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Hydroforming technology has received an attention of the automotive industry because of its advantages compared to conventional manufacturing technologies. A wide range of products such as subframes, camshafts, radiator frames, axles and crankshafts are made by hydroforming process and the hydroformed parts often need to be structurally joined to other components during assembly. Therefore, it is useful if the hydroformed automotive parts can be manufactured with a localized attachment flange. In this study, hydroforming process for the flanged tubular parts was proposed. FE analysis to form flanged rectangular shape was preformed with Dynaform 5.5. With optimized condition, hydroforming experiments to form flange were performed. Forming characteristic at various tube properties conditions was analyzed and optimized internal pressure condition was evaluated. The results show that flanged parts can be successfully produced by tube hydroforming process.
Direct Laser Melting 공정시 차폐가스가 성형 특성에 미치는 영향
한상욱(S. W. Han),신세계로(S. G. R. Shin),신은경(E. K. Shin),이철환(C. H. Lee),문영훈(Y. H. Moon) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Direct Laser Melting process is a kind of prototyping process whereby a 3-D part is built layer wise by laser scanning the powder. This process is highly influenced by shielding gas and laser parameters such as laser power, scan rate, layering thickness and rescanning. Especially, shielding gas is important in evaluating the microstructure and mechanical properties. In this study, fabrication was carried out by experimental facilities consisting of a 200W fiber laser. Cylinder was fabricated by shielding gas atmosphere such as Air, Ar and N₂ with Fe-Ni-Cr powder to investigate forming characteristics. Although surface properties was improve, surface roughness was similar without significant change. In order to evaluate the formability, flow stress curves were analyzed. The microstructure is different by scan rate and rescanning.