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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.
Influence of stator vane number on performance of the axial-flow pump
Can Kang,Xiaojie Yu,Weifeng Gong,Changjiang Li,Qifeng Huang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
The interplay of impeller and stator is investigated for an axial-flow pump. Three stator vane numbers of 5, 7 and 9 are devised tomatch the same impeller. The renormalization group k-ε turbulence model is used to simulate three-dimensional flows in three pumpswith different vane numbers. Axial velocity distributions at impeller outlet and stator outlet are comparatively analyzed. Experimentsassess operation performance of the three pumps. Vibration parameters and static pressure fluctuations are measured as well. It is indicatedthat the influence of vane number on both pump head and pump efficiency is insignificant. Large stator vane number contributes tothe improvement of the uniformity of axial velocity distribution at impeller outlet. At stator outlet, similar tendency is revealed. Severevibration occurs near the outlet bend of the pump, as is particularly remarkable at vane number of 9. For the three cases, blade passingfrequency and its harmonics are predominant in the frequency spectra of pressure fluctuations. As flow rate increases from 0.8Q to 1.0Q,high-frequency pressure fluctuations are suppressed considerably at vane number of 9, while the other two cases also manifest a declinein overall pressure fluctuation amplitude. The 7-vane case is the most preferable one among the three cases in terms of both pump performanceand pressure fluctuation between the impeller and the stator.
Guiju Xu,Jiangshuai Huang,Xiaojie Su 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.1
In this paper, we propose a decentralized adaptive control scheme for a class of interconnected nonlinearsystems without a priori knowledge of subsystems’ control directions and unknown actuator failure. To addressthis problem, a novel Nussbaum-type function is proposed and a key theorem is drawn which involves quantifyingthe interconnections of multiple Nussbaum-type functions of the subsystems with different control directions in asingle inequality. The effect of actuator failures is successfully compensated. Global stability of the closed-loopsystem and asymptotic stabilization of subsystems’ output are proved and a simulation example is given to illustratethe effectiveness of the proposed control scheme.
Qin, Shuanglin,Wang, Pan,Huang, Shuangping,Liu, Shuai,Wang, Gaopeng,Wang, Liping,Sun, Meng,Wang, Xiaoji Korean Chemical Society 2015 대한화학회지 Vol.59 No.6
The reductive amination of cyclohexanone with ammonia over Cu-Cr-a/γ-Al<sub>2</sub>O<sub>3</sub> was investigated. It was found that a proper solvent with high solubility of ammonia and 4Å molecular sieves for the elimination of generated water contributed to the formation of cyclohexylamine in the premixing process. In addition, the addition of ammonia in the fixedbed reactor could obviously improve the conversion of cyclohexanone to cyclohexylamine. Finally, reaction conditions including reaction temperature, hydrogen pressure and charging rate of the premix were optimized. Under the optimized conditions, cyclohexylamine was obtained in 83.06% yield.
Yue Gao,Zhiguo Zhao,Xiaojie Huang,Huan Xing,Guang Yang 한국고분자학회 2024 Macromolecular Research Vol.32 No.3
The development of smart materials with reversible thermochromic properties is of great importance in the fields of sensors, displays and anticounterfeitings. In this article, a diacetylene monomer (AQDA) containing aminoquinoline as a head group was synthesized. Together with fluorescein-substituted diacetylene (FDA) and 10,12-pentacosadiynoic acid (PCDA), hybrid PDA vesicles were obtained through self-assembly and topochemical polymerization process. The hybrid PDA vesicles (FDA, AQDA and PCDA with molar ratio of 7:2:1) display an partially reversible green-to-orange red colorimetric change in a wider temperature range from 20 to 100 °C focusing on the stronger hydrogen bonding and aromatic interactions. This work may provide fundamental understanding of the mechanism and strategies for the design of reversible thermochromic PDA materials.
Xiang-Hong Xu,Yuanhui Jia,Xinyao Zhou,Dandan Xie,Xiaojie Huang,Linyan Jia,Qian Zhou,Qingliang Zheng,Xiangyu Zhou,Kai Wang,Li-Ping Jin 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
Preeclampsia is a pregnancy-specific disorder that is a major cause of maternal and fetal morbidity and mortality with a prevalence of 6–8% of pregnancies. Although impaired trophoblast invasion in early pregnancy is known to be closely associated with preeclampsia, the underlying mechanisms remain elusive. Here we revealed that lysyl oxidase (LOX) and LOX-like protein 2 (LOXL2) play a critical role in preeclampsia. Our results demonstrated that LOX and LOXL2 expression decreased in preeclamptic placentas. Moreover, knockdown of LOX or LOXL2 suppressed trophoblast cell migration and invasion. Mechanistically, collagen production was induced in LOX- or LOXL2-downregulated trophoblast cells through activation of the TGF-β1/Smad3 pathway. Notably, inhibition of the TGF-β1/Smad3 pathway could rescue the defects caused by LOX or LOXL2 knockdown, thereby underlining the significance of the TGF-β1/ Smad3 pathway downstream of LOX and LOXL2 in trophoblast cells. Additionally, induced collagen production and activated TGF-β1/Smad3 were observed in clinical samples from preeclamptic placentas. Collectively, our study suggests that the downregulation of LOX and LOXL2 leading to reduced trophoblast cell migration and invasion through activation of the TGF-β1/Smad3/collagen pathway is relevant to preeclampsia. Thus, we proposed that LOX, LOXL2, and the TGF-β1/Smad3/collagen pathway can serve as potential markers and targets for clinical diagnosis and therapy for preeclampsia.