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Distributed Security Control for Complex Cyber-physical Systems Against Denial-of-service Attacks
Xiaojie Huang,Da-Wei Ding,Zhiqiang Li,Cuijuan An 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2
This paper investigates the problem of distributed security control for complex cyber-physical systems against denial-of-service (DoS) attacks. A distributed security controller with interconnected control nodes is proposed on the basis of piecewise Lyapunov functions. The bounds of attack frequency and attack duration are explicitly calculated to achieve security synchronization. Meanwhile, an event-based data update strategy is proposed to resist the negative influence of DoS attacks on data transmission. Finally, a simulation example is given to verify the effectiveness of the proposed method.
A Novel Double Layer Cantilevers Harvester for Vibration Energy
Chen Xiaojie,Qiu Chengjun,Qu Wei,Liu Yibo,Xia Hongyang 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.8
This paper reported a double layer cantilever harvester powered for vibration energy. A space layer between the PZT beam and the support silicon beam is existed, leading to the double layer cantilever structure. Such structure can allow the more strain generated by the piezoelectric layer due to the existing of space layer, and the output voltage is further increased. The formula of output voltage is then derived from the piezoelectric effect equation and vibration model. And the formula verifies the relationship of voltage and structure parameter. And the simulation in micrometer lever is used to discuss the relationship. Finally, the prototype is assembled and measured to verify the feature of the device. Experimentally, the 3.8V output voltage and 16.9uW output power is acquired.
Investigation on characteristics of pressure fluctuation in a centrifugal pump with clearance flow
Lulu Zheng,Xiaoping Chen,Wei Zhang,Zu-chao Zhu,Jinglei Qu,Mengmeng Wang,Xiaojie Ma,Xueli Cheng 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.9
Clearance flow has great impact on pressure fluctuation of centrifugal pumps. Numerical calculations are performed to study the pressure fluctuation characteristics of centrifugal pump with wear ring clearance, especially in the regions of interaction between main flow and clearance flow (IMC) and clearance. The accuracy of numerical calculations is illustrated by comparing the experiments of performance and pressure fluctuation. Results show that, in clearance region the pressure fluctuation is still governed by blade passing frequency (f BPF ). Its amplitude of dominate frequency of pressure fluctuation becomes larger as the probe approaches the impeller exit. In IMC region, the pressure fluctuation at impeller outlet is dominated by f BPF . However, the dominate frequency at the entrance of impeller is less than f BPF . In addition, as the flow rate increased, the amplitude of dominate frequency of pressure fluctuation increases at impeller entrance, whereas an inverse trend is observed at wear ring clearance region.
Jingjing Lin,Song Yan,Xiaojie Zhang,Yueran Liu,Jun Lian,Hualin Lin,Wei Wei,Deli Lu,Sheng Han 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
Holey Fe-Anderson-type polyoxometalate/polyaniline/graphene (PPG) hybrid materials were first prepared by anchoring Anderson-type polyoxometalates [FeMo6O24H6]3- (FeMo6) onto graphene modified with polyaniline via a facile hydrothermal treatment. The as-prepared materials exhibited an excellent electrochemical performance with a high specific capacitance of 1366 F g -1 at 1 A g -1 and outstanding cycling stability (97.6% capacitance retention after 5000 cycle times). The uptake of polyaniline/FeMo6 nanoparticles on graphene not only provided the pseudocapacitance but also weakened the aggregation between the graphene layers, resulting in a higher surface area compared with pure graphene. In addition, the AC//PPG-15 asymmetric supercapacitor device showed a high energy density of 24.65 W h kg -1 at a low power density of 326.25 W kg -1 and good cycling stability (94.82% capacitance retention after 5000 cycles). Hence, the as-prepared PPG hybrid materials in this work possess tremendous potential as electrodes for high-performance supercapacitors.
Construction of Eukaryotic Vector Expressing shRNA of Lycopene Cyclase Gene carRA
( Ye Li ),( Lihua Jin ),( Qing Wei ),( Xiaojie Wang ),( Bo Li ),( Yuning Zhang ),( Liqing Zhang ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.2
To construct eukaryotic vector expressing shRNA (short hairpin RNA) of carRA. Methods: Designing three different shRNA targeting the coding sequence of the car RA, the mU6-carRA shRNA was constructed by inserting the designed shRNA to the eukaryotic expression vector mU6pro. The constructed eukaryotic vector expressing shRNA of carRA was transformed into DH5 strain. Finally, the recombinant plasmid identified by restriction endonuclease was used for sequence analysis. Results: It was verified by partial nucleotide sequencing and restriction endonuclease digestion that the constructed eukaryotic vector expressing shRNA of carRA was correct. Conclusion: The results of study lay the foundation for further studying on its inhibitive effect on cycling of lycopene.
Wang, Chenchong,Shen, Chunguang,Huo, Xiaojie,Zhang, Chi,Xu, Wei Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.5
In order to make reasonable design for the improvement of comprehensive mechanical properties of RAFM steels, the design system with both machine learning and high-throughput optimization algorithm was established. As the basis of the design system, a dataset of RAFM steels was compiled from previous literatures. Then, feature engineering guided random forests regressors were trained by the dataset and NSGA II algorithm were used for the selection of the optimal solutions from the large-scale solution set with nine composition features and two treatment processing features. The selected optimal solutions by this design system showed prospective mechanical properties, which was also consistent with the physical metallurgy theory. This efficiency design mode could give the enlightenment for the design of other metal structural materials with the requirement of multi-properties.
Zhongyao Zhang,Xiaopeng Chen,Jiezhen Liang,Xiaojie Wei,Kaixi Deng,Jiezhong Zou,Linlin Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
The petrol-based random copolymer, e.g., aromatic-hydrocarbon resin, is widely used in industrial production,but the research about its gas–liquid two flow is far from being solved. Herein, the formation,motion, and deformation of a single bubble in six different concentrations of random copolymer solutionswere systemically investigated using high-speed photography (1000 fps), combined with digital imageprocessing technology. The departure time of the bubble first decreases and then increases, and maximumof aspect ratio and specific surface area reduce as the proportion of solute increases. The bubbledeparture time decreases and bubble size increases with viscous force increases in the case of same surfacetension. Based on force balance analysis, added mass force is one of the prime reasons to affect bubbleoscillation during the acceleration phase after bubble detachment, whereas the effect of added massforce decreases as solute increases or as the bubble reaches stability zone. Also, velocity, drag coefficientand aspect ratio of bubble were discussed in detail by dimensionless analysis. Furthermore, three newshape numerical models (based on We, Ta, and WeEo, respectively) were proposed, which allowed for satisfactorypredictions, and new correlations represent well the experimental data in a wider range of Monumbers from the mentioned literature (11.6 logMo 0.63).
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.