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Filter-based Immersion and Invariance Adaptive Control of Nonlinear Systems
Wei Chen,Jian Hu,Jianyong Yao,Weirong Nie,Haibo Zhou 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.1
This paper proposes a novel filter-based immersion and invariance (I&I) adaptive method for nonlinear systems with additive disturbances and parameter uncertainties. The key innovation of the proposed method is a filter construction that involves the dynamics of the system, based on which the I&I parameter estimator with a sigma modification term is designed. Comparing existing I&I methods, the expression for the novel filter-based I&I estimator is given in terms of total derivatives rather than partial derivatives, which is no longer subject to the integrability condition. In combining the sigma modification term, the proposed parameter estimator also guarantee the uniformly ultimately bounded stability of the parameter estimation error when the system is disturbed, which cannot be achieved by the original I&I method. Furthermore, Lyapunov theory demonstrates that the proposed method can guarantee the stability of the nonlinear systems discussed in this paper. Simulation and experimental results confirm the effectiveness of the proposed method.
Yan Cui,Qing Ye,Heya Wang,Yingchao Li,Xiuhua Xia,Weirong Yao,He Qian 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.12
The present study was designed to investigatethe protective effect of aloin against alcoholic liver disease ina chronic alcohol feeding mouse model. Mice were givenalcohol twice a day by intragastric administration for11 weeks (4.0, 4.7, 5.5 g/kg bw/day for the first 3 weeksrespectively, 6.3 g/kg bw/day for the following 8 weeks). Aloin (10, 30 mg/kg bw) or vehicle was given by gavage tomice after each alcohol administration. Alcohol elevated theserum transaminases alanine aminotransferase, aspartateaminotransferase, total cholesterol and triglyceride levelswhich were significantly attenuated by the co-administrationof aloin (p\0.05). Histopathological observations wereconsistent with these indices. Co-administration of aloinsignificantly suppressed the alcohol-dependent induction ofsterol regulatory element-binding protein-1c expression(p\0.01) and remarkably up-regulated themRNA levels ofAMP-activated protein kinase-a2 (p\0.001). Furthermore,aloin supplementation significantly inhibited the alcoholdependentelevation of malondialdehyde and cytochromeP4502E1 expression (p\0.05), and significantly elevatedsuperoxide dismutase activity (p\0.01). The up-regulationof serum lipopolysaccharide (LPS), hepatic nitric oxide,tumor necrosis factor a, toll-like receptor-4, and myeloiddifferentiation primary response gene 88 were also markedlysuppressed by the co-administration of aloin (p\0.05) inalcohol-treated mice. These results suggest that aloin mayrepresent a novel, protective strategy against chronic alcoholicliver injury by attenuating lipid accumulation, oxidativestress and LPS-induced inflammatory response.