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간헐적인 층간접착 을 이용한 Graphite/Epoxy 복합재료 의 파괴인성 개선
임승규,홍창선 대한기계학회 1984 대한기계학회논문집 Vol.8 No.5
본 연구에서는 [0˚/90˚]$_{2s}$, Gr/Gp 복합 적층판에 대해서 접착면의 비율과 폴리에스테르 필름의 구멍의 형상이 적층판의 인장 성질과 파괴인성에 미치는 영향에 대한 실험적인 결과를 얻고자 한다.다. The concept of intermittent interlaminar bonding is investigated as a means of improving the fracture toughness of cross-ply Gr/Ep composites without significant loss of tensile strength and modulus. The concept of linear elastic fracture mechanics(LEFM)is used to study the effects of strong bonded area and bonding composites. The experimental results indicate that the fracture toughness and notch strength of intermittent interlaminar bonded composities are improved and the tensile strength only decreased by 3-8% in comparison to those of the fully bonded composites. Damage zones around the crack tip are detected by the modified X-Ray non-destructive testing technique and the fractography. The improvement of toughness is explained based on the damage zones. The mechanisms of damage zone are shown to be caused by subcrack along the fiber on the 0.deg. ply, matrix cracking along the fiber on the 90.deg. ply, interlaminar delamination, and ply pull-out of the 0.deg. ply.
노인들의 생활체육 참여 동기와 여가 및 생활만족도와의 관계
임승규,석강훈,김주호 한국스포츠학회 2011 한국스포츠학회지 Vol.9 No.4
The purpose of this study was to examine the participation motivation of elderly people in sport for all and the impact of their participation motivation on leisure satisfaction and life satisfaction, as our society has turned into an aging society. The findings of the study were as follows: First, the sport for all participation motivation of the elderly people had a significant impact on psychological, physiological, resting, educational and social leisure satisfaction, which were the subfactors of leisure satisfaction. Second, the sport for all participation motivation of the elderly people exerted a significant influence on their positive and negative life satisfaction, which were the subfactors of life satisfaction. Third, the elderly people's leisure satisfaction through sport for all had a significant impact on their positive and negative life satisfaction, which were the subfactors of life satisfaction. The findings of the study suggest that a wide variety of programs should be developed and provided for elderly people to enjoy sport for all and lead a comfortable life without being alienated in today's aging society, and that they should officially be assisted from the government to take part in sport for all to boost their quality of life.
임승규,설재욱,김선종,정재민,선윤권,최진봉 한방재활의학과학회 2023 한방재활의학과학회지 Vol.33 No.1
Objectives This study was conducted to find out the antioxidant and inflammatory improvement effects of Wolbigachul-tang. Methods To evaluate the antioxidant and anti-inflammatory effects of wolbigachul- tang, the total polyphenol and flavonoid contents were measured. And radical scavenging function was measured. In addition reactive oxygen species, nitric oxide, cytokines productions were measured by treating wolbigachul-tang in the lipopolysaccharide- induced RAW264.7 cells. We also measured the gene expression of inducible nitric oxide synthase, cyclooxygenase-2, cytokines too. Results Radical scavenging experiments showed significant concentration-dependent scavenging capacity increase. The amount of reactive oxygen species, nitric oxide, cytokines production in the cell all showed a significant concentration-dependent decrease compared to the control group. The gene expression of inducible nitric oxide synthase, cyclooxygenase-2, and cytokines also showed a significant concentration- dependent decrease compared to the control group. Conclusions In conclusion, it is believed that wolbigachul-tang can be applied to various inflammatory diseases. (J Korean Med Rehabil 2023;33(1):1-12)