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연구논문 : 솔잎추출물 처리가 모발생장 및 생리적 변화특성에 미치는 요인 연구
신부섭 ( Buseop Shin ) 한국미용학회 2013 한국미용학회지 Vol.19 No.4
The study is to provide it as a basic study of using pine needle extracts in the field of natural functional hair growth improvement and its medical aspect in treatment improvement. A total of 60 5-week old C57BL/6(20~22 g) mice were epilated by having 1 week of adaptation period, and the 60 epilated mice were randomly distributed into 4 subgroups, 15 in each group, by following a randomized block design, and the extracts were dermal coated to perform tests in the field of molecular pathology, hematology, superoxide metabolism enzymatic activation and lipid peroxide content along with the measurement of organ weight, and the following results were acquired. Statistically significant difference (p<0.05) was observed between the positive control and the experimental groups (E1, E2), but no significant difference was observed between the test groups. Integrating the results, the pine needle extracts were found to have a significant effect on hair growth. The present study is considered useful in the development of hair growth improving agent and in the study of ingredients that show various efficacy. Therefore, it is considered necessary to perform further studies.
신부섭(Buseop Shin),손혁수(Hyuksu Son),임원식(Wonsik Lim) 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.6
Unlike passenger vehicles, heavy-duty vehicles vary greatly in overall mass depending on the load. When braking while driving a heavy-duty vehicle at high speed using friction brakes, significantly large braking power is generated. If there is no energy release system with sufficient power capacity, the brake system will overheat and lose braking power or even cause a fire. Therefore, in order to secure the braking stability of heavy-duty vehicles, a stable auxiliary braking system that assists the friction brake system is essential. As an auxiliary braking system, a retarder is a device that obtains braking force by using fluid flow resistance, and offers the advantages of being compact and having excellent operating durability. Since the internal flow field of the retarder rotates at high speed in a state where air and fluid are mixed, it is very difficult to measure flow characteristics and predict performance using performance tests. To overcome this difficulty, this study proposes an equivalent performance model that can represent the retarder output performance by analyzing the retarder shape factor and applying the transient state analysis results of the internal flow field.