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Effects of the Frequency-degree Correlation on Local Synchronization in Complex Networks
Shijin Jiang,Wenyi Fang,Shaoting Tang,Sen Pei,Shu Yan,Zhiming Zheng 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2
We investigate the effects of the frequency-degree correlation on local synchronization in complex networks with Kuramoto oscillators. We find that a discontinuous synchronization transition occurs in the local patterns for heterogenous networks while for homogenous networks, the local synchronization transition remains continuous. Then, we extend our study to a general frequency-degree correlation case and conclude that the positive correlation does not change the local synchronization patterns while in the case of a negative correlation, the local synchronization transition degenerates to second order. Moreover, the correlation parameter α is verified to have a strong influence on the synchronization level. In particular, smaller |α| results in higher synchronization ability and faster speed to a synchronized state. Our study provides a deeper understanding of the effects of the frequency-degree correlation on network synchronization.
Using ARIMA Model to Fit and Predict Index of Stock Price Based on Wavelet De-Noising
Shihua Luo,Fang Yan,Dejian Lai,Wenyi Wu,Fucai Lu 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.12
To accommodate non-stationarity and strong noise in the SPI data, the research used wavelet method for de-noising and autoregressive integrated moving average model(ARIMA) for prediction. Seven-day moving averages of closing time SPI data in four Asian stock marketswereanalyzed.Empiricalresults show that after de-noising more accurate forecasting results can be obtained in developed markets. More developed market indexes seem more significant improvement; while for less developed market indexes, the improvement of de-noising is less significant. This is in accordance with current situation of market.
Xiufang Zhu,Qin Zhong,Han Yan,Xuejun Zhao,Wenyi Tan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
Perovskite-type Ce_(0.9)Sr_(0.1)Cr_(0.5)Mn_(0.5)O_(3-δ) (CSCMn) was synthesized and evaluated as anode for solid oxygen fuel cells based on Ce_(0.8)Sm_(0.2)O_(1.9) (SDC). The conductivities of CSCMn were evaluated with DC four-probe method in 3% H_2-N_2 and 5% H_2S-N_2 at 450-700 ℃, respectively. The compositions of CSCMn powders were studied by XRD and thermodynamic calculations. Meanwhile, sintering temperatures affecting phases of CSCMn is also proposed with XRD, and the analysis is given with thermodynamic calculations. CSCMn exhibits good chemical compatibility with electrolyte (SDC) in N_2. After exposure to 5% H_2S-N_2 for 5 h at 800 ℃, CSCMn crystal structures change and some sulfides are detected, as evidenced by XRD and Raman analyses. The electrochemical properties are measured for the cell comprising CSCMn- SDC/SDC/Ag in 5% H_2S-N_2 at 600 ℃ and in 3% H_2-N_2 at 450 and 500 ℃. The electrochemical impedance spectrum (EIS) is used to analyze ohm and polarization resistance of the cell at various temperatures.
Han, Xiaoqing,Luan, Tao,Sun, Yingying,Yan, Wenyi,Wang, Dake,Zeng, Xianlu Korean Society for Molecular and Cellular Biology 2020 Molecules and cells Vol.43 No.9
Myeloid-derived suppressor cells (MDSCs) promote tumour progression by contributing to angiogenesis, immunosuppression, and immunotherapy resistance. Although recent studies have shown that microRNAs (miRNAs) can promote the expansion of MDSCs in the tumour environment, the mechanisms involved in this process are largely unknown. Here, we report that microRNA 449c (miR-449c) expression was upregulated in myeloid progenitor cells upon activation of C-X-C motif chemokine receptor 2 (CXCR2) under tumour conditions. MiR-449c upregulation increased the generation of monocytic MDSCs (mo-MDSCs). The increased expression of miR-449c could target STAT6 mRNA in myeloid progenitor cells to shift the differentiation balance of myeloid progenitor cells and lead to an enhancement of the mo-MDSCs population in the tumour environment. Thus, our results demonstrate that the miR-449c/STAT6 axis is involved in the expansion of mo-MDSCs from myeloid progenitor cells upon activation of CXCR2, and thus, inhibition of miR-449c/STAT6 signalling may help to attenuate tumour progression.