http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
신혁수,옥정석,노미현 대한운동학회 2013 아시아 운동학 학술지 Vol.15 No.4
[INTRODUCTION] The purposes of this study were to analyze relationship between balance ability, strength, and muscle power and investigate gender differences of these variables. [METHOD] Two hundreds sixty subjects (130 male and 130 female in mid-age group) participated in this study. We used balance system SD (Biodex Medical System Inc., U.S.) to obtain static and dynamic balance index and biodex system 4 pro, an isokinetic test equipment for left, right knee strength and muscle power. Pearson's correlation value between the observed variables were obtained and their significance was verified. Independence sample T-test were performed with α = .05. [RESULTS] The findings were as followings: First, the static and dynamic balance ability and knee muscle strength were significantly correlated. Second, the static and dynamic balance ability and knee muscle power had a significant correlation. Third, left/right knee strength and knee muscle power in men and women were significantly correlated each other. Fourth, the static balance ability of the left leg support and right leg support showed stronger results in men than women, but women were better than men for the dynamic balance ability of the right leg support and both legs support. Fifth, knee muscle strength was higher in men than women. Sixth, muscle power was higher in men than women. [CONCLUSION] These results suggest that participants in middle age show consistent correlation with muscle strength and muscle power per unit weight. Therefore, the weigh may be a critical factor to maintain their balance. Conversely, there was no significant difference between muscle strength and muscle power in gender, dynamic and static balance ability. There are more complex and sensitive factors involved in balance ability, thus further follow-up study will be needed in the future. [서론] 이 연구는 중·장년층에서의 균형력과 근력, 근파워의 상관관계를 분석하고 이들 변인의 성차를 구명하는데 그 목적이 있다. [방법] 이 연구의 피검자는 중·장년층 남자 130명, 여자 130명 계, 260명이었다. 이들을 대상으로 균형력 검사 장비를 사용하여 정적·동적 균형지수를 구하였고, 등속성 근육적성 검사 장비를 사용하여 좌·우측 무릎 근력 및 근파워를 측정였다. 이 연구의 가설을 검증하기 위하여 관찰변인들 간의 Pearson's Correlation를 산출하고 그 유의성을 검증하였으며, 각 변인의 성차에 대하여 독립표본 t-검증(Independent t-test)를 실시하였다. 가설검증의 유의수준은 α=.05로 설정하였다. [결과] 근력과 근파워는 균형력과 일관성 있는 상관관계를 나타내었으나, 절대값 보다는 단위체중당의 근력·근파워가 더욱 다각적인 측면에서의 균형력과 유의한 상관관계를 보였다. 단위체중당의 무릎 근력과 근파워는 남성이 여성에 비하여 강한 것으로 나타났으나, 균형력은 정적 균형에서는 여성보다 남성이, 동적균형에서는 여성이 남성보다 우수하여 상반된 결과를 보였다. [결론] 노화 과정에 있는 중장년층 남녀의 균형력은 단위체중당의 근력·근파워와 일관성 있는 상관관계를 보임으로써 균형력을 유지하는데 있어서 근육적성 뿐만 아니라 체중이 중요한 변수가 될 수 있다는 것을 시사하고 있다. 한편 근력과 근파워의 성차와는 달리, 동적․정적 균형력에서 남녀 간에 일관성 있는 성차가 나타나지 않음을 볼 때 균형력에는 보다 복잡하고 민감한 요인들이 관계하고 있다고 하겠다.
니파야자(Nypa fruticans Wurmb) 싹 추출물 및 분획물의항산화, 세포 보호 및 항균 효과에 관한 평가
신혁수,이윤주,김지웅,송바름,이상래,박수남 한국생약학회 2018 생약학회지 Vol.49 No.2
Nypa fruticans Wurmb is a species of palm, which is widely distributed in the mangrove forest of Southeast Asia. Various parts of N. fruticans has been used as a traditional medicinal plant. However, the physiological activities of N. fruticans has not yet been clarified well. Therefore, in this study, the 50% ethanol extract and its aqueous and ethyl acetate fractions of young shoots of N. fruticans were investigated for their antioxidant, cytoprotective effect, and antimicrobial activities. Every sample possessed very high free radical and various ROS scavenging capacities assessed by employing different in vitro assays such as DPPH∙, O2∙-, ∙OH, and 1O2 scavenging activities. Based on these results, the cytoprotective effect was investigated using the oxidative hemolysis of erythrocyte. We found that the extract and fractions provide a greater protective effect compared with (+)-a-tocopherol. Furthermore, antimicrobial activities were confirmed against skin pathogens by broth microdilution assay. The ethyl acetate fraction had much higher antimicrobial activities than methyl paraben against Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, and Candida albicans. Taken together, our results indicated that the young shoots of N. fruticans may have the potential role as a natural active ingredient through their antioxidant, cytoprotective effect, and antimicrobial activities.
신혁수, 김동범, 박진근, 이인환, 조해용 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2
A valve spring retainer is a small disc and located at intake and exhaust valve stem of engine. The retainer supports a valve spring and transmits spring force to a valve. Force is applied to the retainer repeatedly by a rocker arm. Durability of the retainer is an important factor of performance. Weight of retainer affect dynamic performance of engine. Therefore, optimal strength and weight of the retainer design are needed. In this study, stress distribution and fracture load of retainer were analyzed by using FEM to design optimal strength and weight. Static load test was simulated by using commercial FEM code DEFORM-3D. Shapes of the retainer to reduce weight were designed and analyzed to verify validity of it. Simulated results and experimental ones were compared