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Network Security Prediction Method Based on Kalman Filtering Fusion Decision Entropy Theory
Yunfa Li,Mingyi Li,Yangyang Shen 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.12
Network security situation prediction is of great significance for the use of the Internet, and it is the focus of production and life issues. Under the guidance of the model combination forecasting method, In this paper, based on the Kalman filtering model a new method of network security prediction is presented, which is based on the theory of decision entropy. In this method, the Kalman state equation and measurement equation are constructed according to the key attributes of the network security state, and then combined with the decision entropy theory to predict the future state of network security. The experimental results show that the proposed method has high prediction accuracy and is suitable for the state prediction of network security.
Flow Features of a Prefabricated Pumping Station Operating under High Flow Rate Conditions
Qing Li,Can Kang,Mingyi Li 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.2
A prefabricated pumping station catering to the delivery of medium with high flow rate is investigated. Two configurations of storage tanks are devised. Computational fluid dynamics (CFD) is utilized to acquire flow patterns in the pumping station as the pumps operate concurrently. Flow rate allocation and the disturbance of pump operation to ambient medium are depicted. It is demonstrated that both the serial and parallel configurations can fulfill the requirements of high flow rate. Flow rate differs over storage tanks and pumps as well, as is intensified with the serial configuration. The operation of the pumps arouses non-symmetric flow structures in the tank. In comparison, the parallel configuration is desirable in consideration of the uniformity of cross-sectional total pressure and velocity distributions in the outlet pipe of the prefabricated pumping station.
Lu Li,Mingyi Zhang,Ying Liu,Xitian Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.5
BiOX ( X=Cl , Br, I) nanosheet arrays have been grown on the surface of carbon cloth as recycled photocatalysts. Photocatalytic tests display that the BiOCl/carbon cloth heterostructures possess a much higher degradation rate compared with BiOCl grown on a fluorine-doped tin oxide(FTO) planar substrate. The photocatalytic experimental results indicate that BiOCl/carbon cloth heterostructures show excellent cyclic properties.
Construction of Hierarchical Ni(OH)2@CoMoO4 Nanoflake Composite for High-Performance Supercapacitors
Xueqing Li,Shuang-Yan Lin,Mingyi Zhang,Ge Jiang,Hong Gao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.5
Hierarchical Ni(OH)2@CoMoO4 nanoflake composite on Ni foam was successfully constructed by electrodepositing Ni(OH)2 onto CoMoO4 nanoflake and investigated as binder-free electrodes for supercapacitor. The composite shows a large areal capacitance of 5.23 F cm-2 at current density of 8 mA cm-1, and a capacitance retention of 82.5% after 1000 cycles. The high electrochemical performances can be attributed to the hierarchical nanoflakes structure and the synergetic effect between Ni(OH)2 nanosheets and CoMoO4 nanoflakes. This work demonstrates that Ni(OH)2@CoMoO4 nanoflake composite is highly desirable for application as advanced electrochemical electrode material.
Yongqi Yin,Sufang Fu,Sheng Zhou,Yuling Song,Lin Li,Mingyi Zhang,Jie Wang,Pandiyarajan Mariyappan,Saad M. Alshehri,Tansir Ahamad,Yusuke Yamauchi 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3
Ideal bandgap ~1.4 eV of lead–tin (Pd–Sn) organic–inorganic hybrid perovskite absorber is essential to further enhance thepower conversion efciency of perovskite solar cells (PVSCs). However, due to the facile oxidation of Sn2+, large amount ofSn substituted Pb based PVSCs sufer with low stability in ambient environment. In this work, we realize an ideal bandgapperovskite by introducing a small amount (10 mol%) of Sn2+ to methylammonium lead iodide (MAPbI3). A large grain sizeMAPb0.9Sn0.1I3 flms with strong absorbance can be obtained. As a result, the best performance up to 18.3% efciency isachieved. Importantly, the MAPb0.9Sn0.1I3 cell retains 90% of its performance after operation at the maximum power pointunder full 1-sun illumination for 500 h, in contrast to the quick degradation of MAPbI3 cell. This study demonstrates thepromising potential of stable and efcient ideal band-gap Pb–Sn PVSCs.