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RISS 인기검색어
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- 저자 : ( Changhui Yu ) (검색결과 4 건)
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Yongqiang Wang,Yu Luo,Changhui Feng 한국고분자학회 2019 Macromolecular Research Vol.27 No.10
This study aimed to investigate the effects of temperature and aging on the characteristic parameters of dielectric spectra of epoxy resin impregnated paper insulation. A broadband dielectric spectra test platform was established and an equivalent physical model of the valve side dry-type bushing of the converter transformer was developed. Different degrees of thermal aging were performed at 130 °C for 0, 4, 8, 16, and 32 days. In addition, variation of the complex permittivity and dielectric loss factors of epoxy resin impregnated paper at different temperatures and different degrees of aging was revealed. The dielectric spectra test results were fitted using the Havriliak-Negami (HN) relaxation model. The characteristic parameters were extracted, and the influences of temperature and aging on the characteristic parameters of the HN model were analyzed. The results show that in the low frequency range, temperature and aging exert greater influences on the complex permittivity. In the high frequency range, temperature and aging have smaller effect. The relaxation time and temperature satisfy the relationship of the Arrhenius equation, and the relaxation strength increases exponentially with increasing temperature. The relaxation time τ, the relaxation intensity Δε, the shape parameter α, and the shape parameter β can characterize the aging degree of paper insulation. A linear relationship between relaxation and aging times, and an exponential relationship between relaxation intensity and aging time were revealed.
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Yongqiang Wang,Changhui Feng,Yu Luo,Ruoyu Fei 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
To study the variation of surface characteristics of glass fiber reinforced epoxy composite insulation materialsduring the development of tracking, this paper established an experimental platform for tracking under the inclined platemethod and prepared samples of glass fiber reinforced epoxy resin. In this paper, according to the experimental dischargephenomenon, discharge repetition rate phase diagram and corrosion degree of materials, the process of tracking was dividedinto four stages: initiation, stability, development and outbreak stages. Scanning electron microscope was used to observe thechange of micromorphology of samples in different stages of tracking. The content of elements in different stages of trackingwas determined by energy dispersive spectrometer. The surface characteristic functional groups in different stages of trackingwere measured by Fourier transform infrared spectroscopy. The results show that with the change of surface morphology andthe formation of surface products during tracking, the content of C element in the spherical region of the material decreasedfirst and then increased, and the content of O and Si increased first and then decreased. The epoxy group of the material wasgradually decomposed. Carbonyl group was generated on the surface of the material, and then decomposed during theoutbreak stages. In addition, the deterioration mechanism of thermal aging and tracking was quite different. Thermal agingprovided convenient routes for the electron injection into the material during tracking, thus reducing the tracking and erosionresistance of the material.
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Ginsenosides Rc, as a novel SIRT6 activator, protects mice against high fat diet induced NAFLD
Zehong Yang,Yuanyuan Yu,Nannan Sun,Limian Zhou,Dong Zhang,HaiXin Chen,Wei Miao,Weihang Gao,Canyang Zhang,Changhui Liu,Xiaoying Yang,Xiaojie Wu,Yong Gao The Korean Society of Ginseng 2023 Journal of Ginseng Research Vol.47 No.3
Background: Hepatic lipid disorder impaired mitochondrial homeostasis and intracellular redox balance, triggering development of non-alcohol fatty liver disease (NAFLD), while effective therapeutic approach remains inadequate. Ginsenosides Rc has been reported to maintain glucose balance in adipose tissue, while its role in regulating lipid metabolism remain vacant. Thus, we investigated the function and mechanism of ginsenosides Rc in defending high fat diet (HFD)-induced NAFLD. Methods: Mice primary hepatocytes (MPHs) challenged with oleic acid & palmitic acid were used to test the effects of ginsenosides Rc on intracellular lipid metabolism. RNAseq and molecular docking study were performed to explore potential targets of ginsenosides Rc in defending lipid deposition. Wild type and liver specific sirtuin 6 (SIRT6, 50721) deficient mice on HFD for 12 weeks were subjected to different dose of ginsenosides Rc to determine the function and detailed mechanism in vivo. Results: We identified ginsenosides Rc as a novel SIRT6 activator via increasing its expression and deacetylase activity. Ginsenosides Rc defends OA&PA-induced lipid deposition in MPHs and protects mice against HFD-induced metabolic disorder in dosage dependent manner. Ginsenosides Rc (20mg/kg) injection improved glucose intolerance, insulin resistance, oxidative stress and inflammation response in HFD mice. Ginsenosides Rc treatment accelerates peroxisome proliferator activated receptor alpha (PPAR-α, 19013)-mediated fatty acid oxidation in vivo and in vitro. Hepatic specific SIRT6 deletion abolished ginsenoside Rc-derived protective effects against HFD-induced NAFLD. Conclusion: Ginsenosides Rc protects mice against HFD-induced hepatosteatosis by improving PPAR-α-mediated fatty acid oxidation and antioxidant capacity in a SIRT6 dependent manner, and providing a promising strategy for NAFLD.
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Identity-based Deniable Authenticated Encryption for E-voting Systems
( Chunhua Jin ),( Guanhua Chen ),( Jianyang Zhao ),( Shangbing Gao ),( Changhui Yu ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.6
Deniable authentication (DA) is a protocol in which a receiver can generate an authenticator that is probabilistically indistinguishable from a sender. DA can be applied in many scenarios that require user privacy protection. To enhance the security of DA, in this paper, we construct a new deniable authenticated encryption (DAE) scheme that realizes deniable authentication and confidentiality in a logical single step. Compared with existing approaches, our approach provides proof of security and is efficient in terms of performance analysis. Our scheme is in an identity-based environment; thus, it avoids the public key certificate-based public key infrastructure (PKI). Moreover, we provide an example that shows that our protocol is applicable for e-voting systems.
DBpia
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