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김대용ㆍ조석철ㆍ권혁선ㆍ김미경(Dae Young KimㆍSeok chul ChoㆍHyuk sun KwonㆍMee Kyung Kim) 한국인체미용예술학회 2016 한국인체미용예술학회지 Vol.17 No.1
In this study, we investigated the anti-oxidative effects, antimicrobial, and anti-inflammatory activities of the extracts from broccoli to evaluate its use as a functional ingredient in cosmetics. The extracts are WE (water extract at RT), MWE (mineral water extract at RT), EE (70% ethanol extract at RT), and USEE (heat process for 12 hours at 60℃ after ultrasonification for six hours with 70% ethanol). The measurements of the total polyphenol content from broccoli extracts were highest in EE at 425.24±13.9 mg/g dry. The result of electron donating ability of EE was the highest at 10,000 ㎍/㎖ as 97.81% and increased in a concentration-dependent manner. The ferric reducing antioxidant powder (FRAP) of EE was the highest at 10,000 ㎍/㎖ as 1235.6 μM. In an antimicrobial activity test, the EE showed significant antimicrobial activity against S. epidermidis, S. aureus, E. coli, P. acnes, and P. ovale. Furthermore, broccoli extract exhibited no cytotoxicity in RAW 264.7 cells. Also anti- inflammatory activity by NO assay showed LPS-induced NO was significantly inhibited following treatment with EE of 1,000 ㎍/㎖. Therefore, the broccoli ethanol extract can be used as a resource of natural cosmetic material for functional cosmetics.
김철수(Chul-Su KIM),권혁선(Hyuk-Sun KWON),조상수(Sang-Soo CHO),김정규(Jung-Kyu KIM) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
In this study, in order to perform more efficiently safety design and integrity assessment of structural members, the relational database system on the fatigue strength of steels was constructed. Fatigue strength database contained 343 S-N curves for 39 kinds of the steels and was developed using MS-SQL 2000. Furthermore, the application program for reliability analysis was developed to consider variation of applied stress and fatigue strength. This program consists of 5 modules: search condition, evaluation of P-S-N curve, probabilistic characteristics of fatigue strength and applied stress history, and reliability analysis with strength-stress interference model.
이정훈(Jeong Hun Lee),박성혁(Sung Hyuk Park),권혁선(Hyuk Sun Kwon),김교성(Go Sung Kim),이종수(Chong Soo Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
This study aims to investigate low-cycle fatigue (LCF) behavior of welds of DP780 steels processed by different welding methods: Laser, TIG (tungsten inert gas) and MAG (metal active gas) methods. The LCF properties were analyzed in the context of microstructure and hardness of heat affected zone (HAZ). With an increase in the amount of welding heat inputs, the width of weld metal zone and HAZ increased but hardness decreased. The results of fatigue test showed that the fatigue resistance of as-received material without welding was most superior and that of MAG welded material having the highest heat input was the worst. The Laser and TIG welded materials showed similar fatigue properties. For the Laser welded metal, the fatigue fracture occurred in the parent metal away from the welded zone because the HAZ region had nearly identical characteristic with the parent metal. In case of TIG and MAG welded materials, however, the fatigue crack initiated from the HAZ region due to the relatively lower hardness of HAZ.