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12Cr 합금강의 결정구조에 따른 전기화학적 부식민감성 평가
박광진(KwangJin Park),이규영(KwangJin Park),배동호(DongHo Bae),강용호(YongHo Kang),강명준(MyoungJun Kang),김득한(DeugHan Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Even though 12Cr alloy steel can be different in alloy composition and crystal structure according to the manufactures, it was found that more than 60% of damages were occurred at the condition alternatively repeated wet and dry and condensed vapor at low pressure. And also, it has been well known that both the mechanical properties and the influence of corrosion environments on strength of the 12Cr alloy steel change by its crystal structure. However, in spite of these common facts, it is difficult to find out the quantitative results including the particular environmental condition as well as the actual service conditions. In this study, as a fundamental investigation for providing information to design and to asses integrity of the 12Cr alloy steel, electro-chemical corrosion susceptibility and corrosion rate of the steam turbine bucket material of which its grain size is different was assessed under NaCl solution at 90℃.
American Dream and New Management in Alfred P. Sloan’s Adventures of a White-Collar Man
( Kwangjin Lee ) 서울대학교 미국학연구소 2017 미국학 Vol.40 No.2
This paper analyzes Alfred P. Sloan, Jr.’s Adventures of a White-Collar Man published in 1941. It attempts to find the reason that he wrote the book then. Sloan explicitly insists that the prosperous American society was possible thanks to the adventurers in engineering and business. This paper interprets that he intended to remind the readers that the American Dream were still valid and alive. More importantly, this paper points out that more significant aspects of this book is that it shows the rise of new era in business management. Due to the complexity and the size of the companies, Sloan found totally new and effective principles and successfully applied them to General Motors. The new management that he used became a standard ever since. Therefore Sloan can be seen as a demarcation of a new era in American history.
Antioxidant Effect of Mulberry Leaves and Yacon Tuber Extracts in High-fat Diet-fed Rats
Kwangjin Kim,Yong Lim,Ji Hye Oh,Un Kyu Park,Man Kyu Huh,Seock-Yeon Hwang 대한의생명과학회 2020 Biomedical Science Letters Vol.26 No.3
The effect of mulberry leaves and yacon tuber extracts (MYE) on antioxidant was tested in this study. The present study investigated the in vivo effects of the anti-oxidative effect of MYE on catalase (CAT), superoxide dismutase (SOD), glutathione S-transferase (GST), glutathione peroxidase (GSH-Px), and thiobarbituric acid reactive substances (TBARS). The seven-day acclimation of the mice was divided into six groups: Normal diet group (NOR), high fat diet group (HFD), high fat diet with 0.5% hydroxycitric acid group diet group for positive group (HHCA), high fat diet with 1% mulberry leaf and 1% yacon diet group (MYE-1), high fat diet with 3% mulberry leaf and 3% yacon group (MYE-3) and high fat diet with 5% mulberry leaf and 5% yacon group (MYE-5). The effect of serum antioxidant in the catalase of MYE-1, MYE-3, and HHCA comparing to HFD by 31.0%, 27.7% and 45.2%, respectively (P<0.05~0.01). The effect on hepatic antioxidant in the catalase of HFD was significantly increased 3.7 (77.3%) times than that of NOR (P<0.01). But, the activities of catalase were decreased significantly in MYE-1, MYE-3, MYE-5 and HHCA by 21.7%, 24.2%, 24.9%, and 28.8% compared to HFD, respectively. GSH-Px was significantly decreased in MYE-1, MYE-3, MYE-5 and HHCA by 15.5%, 37.1%, 23.4%, and 23.7% compared to HFD, respectively (P<0.05). The activities of CAT, SOD, GST, GSH-Px, and TBARS were more significantly decreased in MYE-1 and MYE-3 than those of HFD and HHCA. MYE have shown significant effects on anti-oxidative function against high fat diet.