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Modeling of 3-stage Electromagnetic Induction Launcher
Daehwan Kwak,Young Bae Kim,Jong Soo Kim,Chuhyun Cho,Kyung-Seung Yang,Seong-Ho Kim,Byung-Ha Lee,Sanghyuk An,Young-Hyun Lee,Seok Han Yoon,In Su Koo,Yong Gi Baik,Yun Sik Jin 한국자기학회 2015 Journal of Magnetics Vol.20 No.4
Electromagnetic Induction Launchers (EIL) have been receiving great attention due to their advantages of noncontact between the coils and a projectile. This paper describes the modeling and design of 3-stage EIL to accelerate a copper projectile of 50 kg with 290 mm diameter. Our EIL consists of three independent driving coils and pulsed power modules to generate separate driving currents. To find efficient acceleration conditions, the appropriate shape of the driving coils and the position of the projectile have been calculated by using a finite element analysis (FEA) method. The results showed that the projectile can be accelerated more effectively as the gap between the coils is smaller; a final velocity of 45 m/s was obtained. The acceleration efficiency was estimated to be 23.4% when a total electrical energy of 216 kJ was discharged.
( Daehwan Kim ),( Bu Mahn Park ),( Jong Hwan Bae ),( Sekyoo Jeong ) 한국피부장벽학회 2015 한국피부장벽학회지 Vol.17 No.2
Beneficial effects of ceramides or pseudoceramide on skin barrier functions have been repeatedly reported. Most of the studies, however, have focused on the (bio)physical properties of ceramides, in terms of skin lipids structural properties. Recently, important roles of liposensors, including peroxisome-proliferator activated receptor (PPAR) and cannabinoid receptors (CBRs), in skin homeostasis have been suggested, which implies the development potential of "biological pseudoceramide". Previously, we have reported that oleic acid containing pseudoceramide, α-oleoyl oleamide serionol (α-OOS), has an anti-inflammatory activity through CBRs activation. In this study, the effects of newly developed pseudoceramide, Ceramide HS, were investigated. While Ceramide HS also contains oleic acid moiety, it did not show significant anti-inflammatory activity, compared the α-OOS. However, topical application of Ceramide HS on the barrier disrupted skin significantly accelerated barrier recovery in acute disruption model using hairless mouse. In vitro study also showed that Ceramide HS upregulated the mRNA expressions of anti-microbial peptides (AMPs), i.e. human beta defensing and cathelicidin, in HaCaT cells. Interestingly, biomechanical analysis showed that application of Ceramide HS on damaged hair improved the mechanical strength and surface friction. Taken together, these results suggest that the newly developed pseudoceramide, Ceramide HS, have beneficial effects on both skin and hair and it might be used for scalp care products.
Minjee Lee,hayoung kim,Bae Cheol-Min,Lee Daehwan,Choi Boyoung,Park Hyun Min,Jungwoo Yang 건강기능식품미래포럼 2023 건강기능식품미래포럼 학술지 Vol.3 No.3
Supplementing with low-molecular-weight collagen peptides (LMWCPs) contributes to counteracting signs of aging and improving skin hydration. In this study, a method for producing LMWCPs (Post Collagen®) from raw collagen material was developed as follows: 1) cultivating Lacticaseibacillus rhamnosus IDCC 3201, 2) and collecting the liquid part above the sediment, 3) fermenting the collected liquid (2,500 L) with raw collagen material (1,000 kg) and 4) performing spray-drying. Analysis using gel permeation chromatography confirmed that the raw collagen material had broken down into LMWCPs. Additionally, these fermented collagen peptides (FCP, Post Collagen®) displayed antimicrobial activity against 4 major bacteria responsible for causing gastroenteritis. In terms of their potential benefits, treating normal human dermal fibroblasts with 80 mg/mL of FCP significantly increased the production of type I procollagen and stimulated the up-regulation of the hyaluronan synthase 2 gene. Therefore, these findings support that the supernatant of L. rhamnosus IDCC 3201 culture could offer various health benefits of the collagens from of various sources by providing LMWCPs as multifunctional dietary components.