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New Stability Conditions for Uncertain T-S Fuzzy Systems with Interval Time-Varying Delay
Jiyao An,Guilin Wen,Tao Li,Renfa Li 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.3
This paper focuses on the stability problem for uncertain T-S fuzzy systems with interval time-varying delay. The system uncertainties are assumed to be time-varying and norm-bounded. The time-varying delay is considered as either being differentiable uniformly bounded with delay-derivative bounded by constant interval, or being fast-varying case with no restrictions on the delay derivative. Since we employ a novel Lyapunov-Krasovskii functional (LKF) which contains the information on the time-varying delay, and estimate the upper bound of its derivative less conservatively and adopt the convex optimization approach, some less conservative delay-derivative-dependent stability conditions are obtained in terms of linear matrix inequalities (LMIs), without using any free weighting matrix. These conditions are derived that depends on both the upper and lower bounds of the delay derivatives. Finally, some numerical examples are given to demonstrate the effectiveness and reduced conservatism of the proposed method.
Jiyao An 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
In this letter, the problem of delay-derivative-dependent stability analysis for linear systems with intervaldelay is investigated. By constructing variable delay-decomposition Lyapunov-Krasovskii (LK) functional, somedelay-derivative-dependent stability criteria are derived by incorporating with different bounding techniques toestimate some integral terms in the derivative of the LK functional. These criteria are efficient when the upperbound of delay derivative is larger than one. These criteria improve the existing ones with smaller computationburden and less conservatism, which are shown through numerical examples.
David Jiyao Chou,Kelly Yinching Lam,Jianping Chen,Ping Yao,Tina Tingxia Dong,Aizhen Xiong,Guixin Chou,Zhengtao Wang,Karl Wah-Keung Tsim 셀메드 세포교정의약학회 2014 셀메드 (CellMed) Vol.4 No.4
Linderae Radix, the dry roots of Lindera aggregata (Sims) Kosterm, has long been used as traditional Chinese medicine for treatment of inflammatory diseases. The total alkaloids are believed to be the active components responsible for anti-inflammation of Linderae Radix. Here, the total alkaloids of Linderae Radix were extracted and isolated, including 12 isoquinoline alkaloids and 1 furan sesquiterpene. Within the alkaloids, norisoboldine, boldine, linderaline, isoboldine, reticuline, N-methyllaurotetanine, norjuziphine were found to be the major ingredients. In lipopolysaccharide-treated macrophage RAW 264.7 cells, application of Linderae Radix extract, or total alkaloids, suppressed the transcription of pro-inflammatory cytokines, interleukin-1β and interleukin-6. Out of the 12 alkaloids, norisoboldine, boldine, and isoboldine were tested in lipopolysaccharide-treated macrophages, and norisoboldine was the strongest alkaloid in suppressing the cytokine expressions. The current studies suggested that the identification of alkaloids from Linderae Radix could provide a plausible explanation for herbal therapeutic functions.
Kim, YoungHee,Abers, Geoffrey A.,Li, Jiyao,Christensen, Douglas,Calkins, Josh,Rondenay, Sté,phane American Geophysical Union 2014 Journal of Geophysical Research: Solid Earth Vol.119 No.3
We image the slab underneath a 450 km long transect of the Alaska subduction zone to investigate (1) the geometry and velocity structure of the downgoing plate and their relationship to slab seismicity and (2) the interplate coupled zone where the great 1964 earthquake (M-w 9.2) exhibited the largest amount of rupture. The joint teleseismic migration of two array data sets based on receiver functions (RFs) reveals a prominent, shallow-dipping low-velocity layer at similar to 25-30 km depth in southern Alaska. Modeling of RF amplitudes suggests the existence of a thin layer (V-s of similar to 2.1-2.6 km/s) that is similar to 20-40% slower than underlying oceanic crustal velocities, and is sandwiched between the subducted slab and the overriding plate. The observed megathrust layer (with V-p/V-s of 1.9-2.3) may be due to a thick sediment input from the trench in combination with elevated pore fluid pressure in the channel. Our image also includes an unusually thick low-velocity crust subducting with a similar to 20 degrees dip down to 130 km depth at similar to 200 km inland beneath central Alaska. The unusual nature of this subducted segment results from the subduction of the Yakutat terrane crust. Our imaged western edge of the Yakutat terrane aligns with the western end of a geodetically locked patch with high slip deficit, and coincides with the boundary of aftershock events from the 1964 earthquake. It appears that this sharp change in the nature of the downgoing plate could control the slip distribution of great earthquakes on this plate interface.
Liu, Weipeng,Cui, Xiaofeng,Zhou, Jiyao,Zhang, Zehua,Hou, Mingxuan,Shan, Shengqi,Wu, Shang The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.11
In this paper, a composite passivity-based control method based on a finite-time disturbance observer (FTDO) and a passivity-based control (PBC) is proposed to improve the stability of the Boost converters with constant power loads in DC Microgrids. The FTDO improves the robustness and rapidity of the system by accurately estimating system disturbances. The PBC ensures the stability of the system via its transient energy dissipation. The FTDO operates parallel to the PBC, and compensates the observed value to the PBC through a feedforward channel. When compared with other controls, the proposed composite passivity-based control has the advantages of a fast dynamic response and accurate tracking of system disturbances in a wide working range. Finally, the control method proposed in this paper is verified by MATLAB/Simulink simulations and hardware in the hard-ware-in-loop experiments.