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In this paper, we investigate the sampled-data control problem for polynomial sampled-data fuzzy system with time-varying delay. Based on sampled-data technique, a fuzzy controller is designed to guarantee the stability of closed-loop polynomial fuzzy system. By examining the stabilization problem, the Lyapunov-Krasovskii functional (LKF) is adopted and a delay-dependent stabilization condition is...
A new type of subsynchronous resonance (SSR), namely, subsynchronous control interaction (SSCI), was recently observed in doubly-fed induction generators (DFIGs) interfaced with series-compensated power networks. In this paper, a more accurate method based on aggregated RLC circuit model is proposed to intuitively explain and quantitatively evaluate this type of SSR. For a practical power system containing...
This study proposed a novel method to analyze slick-free and oil covered sea surface backscattering in the special case of Deepwater Horizon (DWH) oil spill accident based on combination of tilted Bragg scattering and volume scattering components. The DWH accident represents a particular and challenging case due to the very large amount of leaked oil that came from the bottom of the ocean. The proposed...
In this paper, we will expand the industrial ecosystem to three subsystems: the economy subsystem, the environment subsystem, and the innovation subsystem. Based on principal component analysis and grey correlation analysis, a model of the optimizing degree of Chinese economic industrial ecosystem is developed at the provincial level, and a mathematical definition of the optimization degree is provided...
In this paper, a force allocation model for armed police handling of emergencies is proposed. First, the actual effectiveness of equipment for dispersal is calculated by fully considering the impact of the external environment. Second, the mathematical model of the force allocation is proposed. Third, the solution of the force allocation model is achieved by the linear programming method. Experiments...
In Microgrids, the traditional droop characteristic may result in control errers, because of the output impedance and line impedance. In this paper, the active and reactive circulating current of the parallel system model and the traditional droop characteristic are analyzed. Considering of the output impedance and line impedance, the reactive power sharing improperly is analyzed. Because of the improper...
In this paper, a certain linear optimal programming to reach a minimum total investment of system with the constraints of carbon sink, ecological environment benefits, social economy benefits and so on have been developed and used in a Clean Development Mechanism (CDM) afforestation program in Inner Mongolia. The optimization results of our model propose a more efficient afforestation scheme than...
In this paper, we first established the coastal urban ecological economic development index system. Then using factor analysis and stochastic frontier approach, the coastal zone urban ecological economy input-output efficiency was analyzed. The results could provide theory basis for coastal urban ecological economic development research.
In China, IPO underpricing phenomena attracts more and more attentions. This paper constructs a structural system of equations and uses the instrumental-variables method to analyze IPO underpricing of the full-circulating stocks. Our empirical findings that those IPO underpricing and initial turnovers are negatively correlated support the hypothesis of speculative bubbles. The IPO underpricing is...
Simulation is a key technique for the design and redesign of business processes and is used to evaluate new business process models with respect to key performance indicators. The increasing complexity of todaypsilas business processes hampers a quick identification of weak points of a business process design that were uncovered during simulation. In this paper we add a third dimension into the description...
Draping and buckling of woven fabric and knitted fabric are simulated with finite element method under gravity load, and the difference between them is analyzed. In the process of simulation, micro-mechanical models of woven fabric and knitted fabric that characterize the special properties of fabric due to their structures are used. The fabric sheet is discretized with 8-node shell elements which...
According to the behavior of seismically isolated continuous bridges, the bidirectional nonlinear characteristics of lead rubber bearing are taken into account by using two orthogonal nonlinear level spring elements. Based on the FEA software, the analysis models of seismically isolated and non-isolated continuous bridges are established. And the nonlinear seismic response for these analysis models...
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