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Yuelin Song,Ping Yang,Ziya Peng,Wei Jiang 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.2
AH-32 steel has been widely used in ship and marine structures but not been extensively studied for low-cycle fatigue (LCF) crack growth characteristics. The objective here is to explore the evolution mechanism behind LCF crack propagation behavior under different load conditions, for which the investigation of experimental and numerical simulation is considered in a detailed manner. An analytical model is presented to consider the effect accumulative plastic strain for ship cracked plate subjected to high stress cyclic loading. Different numerical parameters are proposed to quantify stress–strain field near crack-tip, and an integral model is developed to calculate the magnitude of the compressive stress. The effect of the maximum and minimum load on crack closure level is analyzed. The results show that there is an excellent correlation between LCF crack closure parameter and the magnitude of the compressive stress in the plastic wake, which indicates the presented integral model provides a new way for LCF crack propagation analysis.
Xing Fan,Jisu Seo,YueLin Li,Ahyun Ryu,Kyoungok Joo,Moonkyoung Park,Rhayun Song 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10
Aim(s): Physical and cognitive functioning are both indicators of aging process. Older adults experience abnormal declines in physical and cognitive functioning that increase their risk of dependence, subsequently quality of life. This study aims to explore the relationship between physical and cognitive functioning, and mediation effect of cognitive functioning on the relationship of physical functioning and health-related quality of life among older adults with mild cognitive impairment. Method(s): Seventy-nine older adults living in community participated in the study. Measurements included the self-reported questionnaire for physical functioning consisted of grip strength, one leg standing with eyes open (balance), and Timed Up and Go (mobility). Cognitive functioning was measured by Korean version of MOCA. SF-12 was used to assess physical and psychological components of quality of life (QOL). Data were using multiple regression and a simple mediation model applying the PROCESS macro for mediation. Result(s): Physical functioning explained 14.5% of variance in cognitive functioning. Physical and cognitive functioning together explained 22.4% of variance in physical component of QOL, 18.7% of variance in mental component of QOL. Indicators of physical functioning significantly related with cognitive functioning with balance (B=0.41, p=.02). Cognitive functioning had significant indirect effects B= 0.19, 95%CI (.491~.008) between balance and physical component of QOL, while the indirect effects was not significant with mental component of QOL (B=0.06, 95%CI -.107~0.332). Conclusion(s): The findings showed cognitive functioning had a significant mediating effects between the physical functioning and physical components of QOL. These findings have suggested that nursing intervention to improve physical functioning such as balance, mobility and grip strength may also improve cognitive functioning, consequently improving physical component of QOL for older adults with mild cognitive impairment. Further studies are warranted to explore the effects of health promotion programs designed to enhance physical and cognitive functioning in this population.
Yue Lin,Yuanyuan Zhang,Qiongtao Song,Tao Song,Xue Han,Ying Zhang,Xuan Zhang,Xi Chu,Fenghua Zhang,Li Chu,Jianping Zhang 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.10
To explore the cardiovascular protective effectsof Magnesium isoglycyrrhizinate (MI), especially theunderlying cellular mechanisms related to L-type calciumchannels and myocardial contractility, and to examine theeffects of MI on hERG K? current expressed in HEK293cells. We used the whole-cell patch clamp technique,video-based edge detection and dual excitation fluorescencephotomultiplier systems to explore the effect of MIon L-type Ca2? currents (ICa-L) and cell contraction in ratcardiomyocytes. We also examined the rapidly activatingdelayed rectifier potassium current (IKr) expressed inHEK293 cells using a perforated patch clamp. MI inhibitedICa-L in a dose-dependent manner, with a half-maximalinhibitory concentration (IC50) of 0.22 mg/ml, and themaximal inhibitory effect was 61.10 ± 0.59%. MI at aconcentration of 0.3 mg/ml reduced cell shortening by24.12 ± 3.97% and the peak value of the Ca2? transient by36.54 ± 4.96%. MI had no significant influence on hERGK? channels expressed in HEK293 cells at all testpotentials. MI exerts protective effects on the heart via theinhibition of ICa-L and cell shortening in rat cardiomyocytes. However, MI had no significant influence on IKr;thus, MI may exert cardioprotective effects without causingdrug-induced long QT syndrome.