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스테인레스 430 소재의 전처리에 따른 고온 산화거동에 관한 연구
문민석(MinSeok Moon),우기도(KeeDo Woo),송준혁(JoonHyuk Song),오제하(JeHa Oh),강신재(ShinJae Kang) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10
Solid Oxide Fuel Cell (SOFCs) was high temperature operating Fuel cell system. Normally, this system operating temperature is approximately at 800~ 1000C. Fuel cell's efficiency was related with operating temperature. Operating temperature is increased that fuel cell efficiency is increased. Generally, SOFC was used to Bipolar plate material that Ceramic material with doped on the surface. Because SOFC was exposed high temperature atmosphere, ceramic material has stratified properties at the high temperature. At recent times, SOFC investigated focus on reduced operating temperature, IT SOFC (operation temperature at 600~800C) and LT SOFC (operation temperature at 400~600C). The aim of this study, apply to 430 stainless steels with different surface pre-treatment 3types, As-polished, As-Received and Sand Blast on the surface and no thermal satisfied coating treatment on the surface. 430 materials was exposure in the box furnace, at 800C with high temperature oxidation environment. And it observed to oxidation behavior with different exposures time. Oxidation behavior was analysis by SEM, EDS and XRD inspection.
중온용 SOFC 분리판에 적용하기 위한 스테인레스 304 소재의 전처리에 따른 고온 산화거동에 관한 연구
문민석(MinSeok Moon),우기도(KeeDo Woo),송준혁(JoonHyuk Song),김원태(WonTae Kim),오제하(JeHa Oh),강신재(ShinJae Kang) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
Solid oxide fuel cells (SOFCs) have many attractive features for widespread applications for Generation system. Recently investigation for bipolar plate is focus on the Metallic bipolar plate. Solid Oxide Fuel Cell was operated to high temperature than other Fuel cell system, approximately at 800~1000C. Presently day was investigated reduced operation temperature at 600~800C, that is Intermediate temperature SOFC. Solid Oxide Fuel Cell has required of low cost and high-temperature corrosion resistance during the operation. In this case, apply to 304 stainless steels with different pre-surface treatment with no coating treatment on the surface, As-polished, As-Received and Sand Blast on the surface. And 304 was exposure to high temperature oxidation environment, in the box furnace at 800C, and review to oxidation behavior with each material during the different exposures time.(100hrs, 400hrs). Oxidation behavior was measured by SEM, EDS and XRD inspection.
Effects of Fe Addition on Rolling and Age-Hardening Behavior in Al—Si—Mg Alloys
Kim, DaeHwan,Kim, JaeHwang,Son, HyeonTaek,Woo, KeeDo American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.6
<P>Effects of Fe addition on rolling and age-hardening behavior in Al-Si-Mg alloys are investigated in this paper. Microstructure evolution of rolled Al-Si-Mg based alloys was observed using an optical microscope and field emission scanning electron microscope. The chemical compositions of Fe intermetallic compounds (Fe-IMCs) were analyzed by energy dispersive spectrometer (EDS). Fe-IMCs were finely fragmented with the size of around 300 nm and well distributed in the Al matrix through cold rolling process. Heat treatments were carried out to understand the effects of Fe-IMCs on the age-hardening behavior. The peak hardness of Fe-free, 0.5% Fe and 1.0% Fe alloys during aging at 250 degrees C appeared at 1.8, 1.2 and 0.6 ks, respectively. The age-hardening is accelerated at the initial stage during aging at 250 degrees C, while the degree of hardness difference decreased with increasing the Fe contents.</P>
Aquatide Activation of SIRT1 Reduces Cellular Senescence through a SIRT1-FOXO1-Autophagy Axis
( Chae Jin Lim ),( Yong-moon Lee ),( Seung Goo Kang ),( Hyung W. Lim ),( Kyong-oh Shin ),( Se Kyoo Jeong ),( Yang Hoon Huh ),( Suin Choi ),( Myungho Kor ),( Ho Seong Seo ),( Byeong Deog Park ),( Keedo 한국응용약물학회 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.5
Ultraviolet (UV) irradiation is a relevant environment factor to induce cellular senescence and photoaging. Both autophagy- and silent information regulator T1 (SIRT1)-dependent pathways are critical cellular processes of not only maintaining normal cellular functions, but also protecting cellular senescence in skin exposed to UV irradiation. In the present studies, we investigated whether modulation of autophagy induction using a novel synthetic SIRT1 activator, heptasodium hexacarboxymethyl dipeptide-12 (named as Aquatide), suppresses the UVB irradiation-induced skin aging. Treatment with Aquatide directly activates SIRT1 and stimulates autophagy induction in cultured human dermal fibroblasts. Next, we found that Aquatide-mediated activation of SIRT1 increases autophagy induction via deacetylation of forkhead box class O (FOXO) 1. Finally, UVB irradiation-induced cellular senescence measured by SA-β-gal staining was significantly decreased in cells treated with Aquatide in parallel to occurring SIRT1 activation-dependent autophagy. Together, Aquatide modulates autophagy through SIRT1 activation, contributing to suppression of skin aging caused by UV irradiation.