Recently,artificial synapses involving an electrochemical reaction of Li-ion have been attributed to have remarkable synaptic properties.Three-terminal synaptic transistors utilizing Li-ion intercalation exhibits reli...Recently,artificial synapses involving an electrochemical reaction of Li-ion have been attributed to have remarkable synaptic properties.Three-terminal synaptic transistors utilizing Li-ion intercalation exhibits reliable synaptic characteristics by exploiting the advantage of nondistributed weight updates owing to stable ion migrations.However,the three-terminal configurations with large and complex structures impede the crossbar array implementation required for hardware neuromorphic systems.Meanwhile,achieving adequate synaptic performances through effective Li-ion intercalation in vertical two-terminal synaptic devices for array integration remains challenging.Here,two-terminal Au/LixCoO_(2)/Pt artificial synapses are proposed with the potential for practical implementation of hardware neural networks.The Au/LixCoO_(2)/Pt devices demonstrated extraordinary neuromorphic behaviors based on a progressive dearth of Li in LixCoO_(2)films.The intercalation and deintercalation of Li-ion inside the films are precisely controlled over the weight control spike,resulting in improved weight control functionality.Various types of synaptic plasticity were imitated and assessed in terms of key factors such as nonlinearity,symmetricity,and dynamic range.Notably,the LixCoO_(2)-based neuromorphic system outperformed three-terminal synaptic transistors in simulations of convolutional neural networks and multilayer perceptrons due to the high linearity and low programming error.These impressive performances suggest the vertical two-terminal Au/LixCoO_(2)/Pt artificial synapses as promising candidates for hardware neural networks.展开更多
The purpose of the present study was to investigate the relationship between types of leisure activities and happi-ness,life satisfaction,and health perception of older Korean adults during the COVID-19 era.Using snow...The purpose of the present study was to investigate the relationship between types of leisure activities and happi-ness,life satisfaction,and health perception of older Korean adults during the COVID-19 era.Using snowballing and purposive sampling methods,123 respondents participated in the study.The results show that participation in outdoor activities and home-based activities served as a strong predictor of happiness,life satisfaction,and health perceptions among older Korean adults.Thesefindings suggest that engaging in outdoor activities and home-based activities is likely to increase the psychological and mental health of older Korean adults during the COVID-19 era.展开更多
Little information exists with regard to the relationship between leisure and coping mechanisms among people with physical disabilities.The purpose of this study is to investigate the relationships among leisure,copin...Little information exists with regard to the relationship between leisure and coping mechanisms among people with physical disabilities.The purpose of this study is to investigate the relationships among leisure,coping,and personal growth among people with physical disabilities living in the U.S.Using a purposive sampling strategy,121 participants completed all 3 instruments:assessment of leisure and recreation involvement,coping strategy indicator,and personal growth.Frequency,descriptive analysis,Pearson correlations,and path analysis were utilized to test the relationship between leisure involvement,coping strategies,and personal growth.There were statistically significant direct effects of leisure involvement and avoidance-withdrawal coping strategies on personal growth.The effects of social support seeking coping strategies and problem-solving coping strategies on personal growth were not statistically significant.Results also indicated that leisure involvement had significant direct effects on social support seeking,avoidance-withdrawal,and problem-solving coping strategies.The results demonstrated that leisure engagement was associated with coping strategies and personal growth.In particular,leisure engagement had direct effects on problem-solving coping,social seeking coping,and avoidance/withdrawal coping as well as a direct effect on personal growth.展开更多
基金supported by National Research Foundation of Korea (NRF) grant funded by the Korea government Ministry of Science and ICT (MSIT) (2021R1A4A3027878, 2021M3H4A3A02086430)supported by the KRISS (Korea Research Institute of Standards and Science) MPI Lab. program
基金financially supported by National R&D Program(2018M3D1A1058793,2021M3H4A3A02086430)through NRF(National Research Foundation of Korea)funded by the Ministry of Science and ICTsupported by SAIT,Samsung Electronics Co.,Ltd。
文摘Recently,artificial synapses involving an electrochemical reaction of Li-ion have been attributed to have remarkable synaptic properties.Three-terminal synaptic transistors utilizing Li-ion intercalation exhibits reliable synaptic characteristics by exploiting the advantage of nondistributed weight updates owing to stable ion migrations.However,the three-terminal configurations with large and complex structures impede the crossbar array implementation required for hardware neuromorphic systems.Meanwhile,achieving adequate synaptic performances through effective Li-ion intercalation in vertical two-terminal synaptic devices for array integration remains challenging.Here,two-terminal Au/LixCoO_(2)/Pt artificial synapses are proposed with the potential for practical implementation of hardware neural networks.The Au/LixCoO_(2)/Pt devices demonstrated extraordinary neuromorphic behaviors based on a progressive dearth of Li in LixCoO_(2)films.The intercalation and deintercalation of Li-ion inside the films are precisely controlled over the weight control spike,resulting in improved weight control functionality.Various types of synaptic plasticity were imitated and assessed in terms of key factors such as nonlinearity,symmetricity,and dynamic range.Notably,the LixCoO_(2)-based neuromorphic system outperformed three-terminal synaptic transistors in simulations of convolutional neural networks and multilayer perceptrons due to the high linearity and low programming error.These impressive performances suggest the vertical two-terminal Au/LixCoO_(2)/Pt artificial synapses as promising candidates for hardware neural networks.
基金supported by the 2020 Korean Studies Grant Program of the Academy of Korean Studies(AKS-2020-R-20).
文摘The purpose of the present study was to investigate the relationship between types of leisure activities and happi-ness,life satisfaction,and health perception of older Korean adults during the COVID-19 era.Using snowballing and purposive sampling methods,123 respondents participated in the study.The results show that participation in outdoor activities and home-based activities served as a strong predictor of happiness,life satisfaction,and health perceptions among older Korean adults.Thesefindings suggest that engaging in outdoor activities and home-based activities is likely to increase the psychological and mental health of older Korean adults during the COVID-19 era.
基金supported by Leisure Research Institute at Indiana University.
文摘Little information exists with regard to the relationship between leisure and coping mechanisms among people with physical disabilities.The purpose of this study is to investigate the relationships among leisure,coping,and personal growth among people with physical disabilities living in the U.S.Using a purposive sampling strategy,121 participants completed all 3 instruments:assessment of leisure and recreation involvement,coping strategy indicator,and personal growth.Frequency,descriptive analysis,Pearson correlations,and path analysis were utilized to test the relationship between leisure involvement,coping strategies,and personal growth.There were statistically significant direct effects of leisure involvement and avoidance-withdrawal coping strategies on personal growth.The effects of social support seeking coping strategies and problem-solving coping strategies on personal growth were not statistically significant.Results also indicated that leisure involvement had significant direct effects on social support seeking,avoidance-withdrawal,and problem-solving coping strategies.The results demonstrated that leisure engagement was associated with coping strategies and personal growth.In particular,leisure engagement had direct effects on problem-solving coping,social seeking coping,and avoidance/withdrawal coping as well as a direct effect on personal growth.
