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XU XIAOTONG,정행순,이지은,강우신,류시형,변의백,김광욱,변의홍,안동현 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.4
In this study, characterization and antiinflammatory activity of Undaria pinnatifida root (UPR) water extracts treated by gamma (γ)-irradiation were investigated. The UPR powder was dissolved in distilled water to form UPR water extracts. Subsequently, they were irradiated with cobalt-60 γ-rays in a dose range from 3 to 20 kGy. In the reducing sugar and viscosity analyses, the reducing sugar content showed a two-fold increase at 20 kGy compared to the non-irradiated control, and UPR water extracts viscosity decreased with increasing irradiation dose. Using thin layer chromatography (TLC), UPR polysaccharides were degraded to monosaccharides after γ-irradiation treatment. Moreover, UPR water extracts treated with γ-irradiation inhibited the production of nitric oxide (NO) and pro-inflammatory cytokine (IL-6 and TNF-α) activity. Therefore, γ-irradiation not only degrades UPR water extracts polysaccharides, but also increases the antiinflammatory activity of UPR water extracts.
Hybrid Control and Protection Scheme for Inverter Dominated Microgrids
Xu, Xiaotong,Wen, Huiqing,Jiang, Lin,Hu, Yihua The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
With the high penetration of various sustainable energy sources, the control and protection of Microgrids has become a challenging problem considering the inherent current limitation feature of inverter-based Distributed Generators (DGs) and the bidirectional power flow in Microgrids. In this paper, a hybrid control and protection scheme is proposed, which combines the traditional inverse-time overcurrent protection with the biased differential protection for different feeders with different kinds of loads. It naturally accommodates various control strategies such as P-Q control and V-f control. The parameter settings of the protection scheme are analyzed and calculated through a fast Fourier transform algorithm, and the stability of the control strategy is discussed by building a small signal model in MATLAB. Different operation modes such as the grid-connected mode, the islanding mode, and the transitions between these two modes are ensured. A Microgrid model is established in PSCAD and the analysis results show that a Microgrid system can be effectively protected against different faults such as the single phase to ground and the three phase faults in both the grid-connected and islanded operation modes.
Hybrid Control and Protection Scheme for Inverter Dominated Microgrids
Xiaotong Xu,Huiqing Wen,Lin Jiang,Yihua Hu 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
With the high penetration of various sustainable energy sources, the control and protection of Microgrids has become a challenging problem considering the inherent current limitation feature of inverter-based Distributed Generators (DGs) and the bidirectional power flow in Microgrids. In this paper, a hybrid control and protection scheme is proposed, which combines the traditional inverse-time overcurrent protection with the biased differential protection for different feeders with different kinds of loads. It naturally accommodates various control strategies such as P-Q control and V-f control. The parameter settings of the protection scheme are analyzed and calculated through a fast Fourier transform algorithm, and the stability of the control strategy is discussed by building a small signal model in MATLAB. Different operation modes such as the grid-connected mode, the islanding mode, and the transitions between these two modes are ensured. A Microgrid model is established in PSCAD and the analysis results show that a Microgrid system can be effectively protected against different faults such as the single phase to ground and the three phase faults in both the grid-connected and islanded operation modes.
Short selling mechanism and enterprise innovation
Xiaotong XU 한국유통과학회 2018 KODISA ICBE (International Conference on Business Vol.2018 No.-
Securities credit transaction was officially implemented in China s capital market at the end of March 2010, and it is a landmark event in China.On March 31, 2010, China officially relaxed short-selling controls, marking the era of China s capital market entering bilateral transactions.This paper take the data of A-share Listed companies in China as a sample to examine the impact of the liberalization of short selling on managers opportunistic behavior in innovative investment. The main conclusions of this paper are as follows: (1) There is a positive correlation between the short selling mechanism and the innovation input of enterprises, that is, the introduction of short selling mechanism has a positive incentive effect on the innovation input of enterprises. (2) Further, the impact of the short selling mechanism on the innovation output of enterprises is verified. It is found that the short selling mechanism is significantly positively correlated with the substantial innovation output of the enterprise; the short selling mechanism is significantly negatively correlated with the non-substantial innovation output of the enterprise; the short selling mechanism is negatively correlated with the total output of the enterprise innovation, but it is not statistically Significant.
Xiaotong Xu,정행순,이지은,강우신,류시형,김광욱,변의홍,조영제,안동현 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.1
This study investigated the characterization and functionality of Undaria pinnatifida root (UPT) extracts, degraded using a crude enzyme from Shewanella oneidensis PKA1008. To obtain the optimum degrading conditions, the UPT was mixed with alginate degrading enzymes from S. oneidensis PKA 1008 and was incubated at 30°C for 0, 3, 6, 12, 24, and 48 h. The alginate degrading ability of these enzymes was then evaluated by measuring the reducing sugar, viscosity, pH and chromaticity. Enzymatic extract at 24 h revealed the highest alginate degrading ability and the lowest pH value. As the incubation time increased, the lightness (L *) also decreased and was measured at its lowest value, 39.84, at 12 hours. The redness and yellowness increased gradually to 10.27 at 6 h and to 63.95 at 3 h, respectively. Moreover, the alginate oligosaccharides exhibited significant anti-inflammatory activity. These results indicate that a crude enzyme from S. oneidensis PKA 1008 can be used to enhance the polysaccharide degradation of UPT and the alginate oligosaccharides may also enhance the anti-inflammatory effect.