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공민규(Min Gyu Kong),강동수(Dong Soo Kang),송철기(Chul Ki Song),박중환(Joong Hwan Park),정종규(Jong Kyu Jung),윤세봉(Se Bong Yoon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Gears are widely used in the commercial vehicles. Because recent heavy-duty commercial vehicles require higher power delivery, multi-stage gear system is being developed in many vehicle companies. In order to deliver higher power, the multi-stage gear system will require higher strength gears. In this paper, strength analysis of gears is studied by using ROMAX-DESIGNER and gears are evaluated for stability and durability.
최외숙(Oi-Sook Choi),권미화(Mi-Hwa Kwon),공민규(Min-Kyu Kong),이순희(Soon-Hee Lee),강성례(Sung-Rye Gang),김필순(Pil-Sun Kim),김영철(Young-Chul Kim) 환경독성보건학회 2008 환경독성보건학회지 Vol.23 No.2
The purpose of this study was to investigate the effects of frankincense oil in skin aging animal model. Skin aging was induced by both the irradiation of UVB and the application of squalene monohydroperoxide (Sq-OOH) to the back of experimental animals for 4 weeks. And at the same time experimental materials were applied topically. Six to seven weeks female SHR-1 hairless mice were divided into five groups including nor-mal (N: saline), control (C: UVB+Sq-OOH+saline), vehicle control (VC: UVB+Sq-OOH+jojoba oil), positive control (PC: UVB+Sq-OOH+0.01% retinoic acid) and experimental (E: UVB+Sq-OOH+3% Frankincense oil) groups, five animals each group. Lipid lamella and lipid content in stratum corneum of the E group were almost intact with a regular arrangement which were similar to the N group. Collagen fibers in dermis of the E group were almost intact with a regular arrangement which were similar to the N group. Relatively much less number of mast cells and inflammatory cells were found in the E group compared to the C group. The activities of XO, SOD and CAT were no significant difference between the E and N groups. In conclusion, the application of frankincense oil to the skin aging animal model reduced both the generation of free radicals and the damage of skin tissues. Therefore, frankincense oil can be used practically for the prevention or improvement of skin aging in terms of health promotion and beauty for the people.