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Aiming to the defects in the traditional speed-control of rotary screen rack, such as poor dynamic performance, poor noise immunity, untimely regulation and strong dependence on personnel and experience and so on, this paper proposes a linear quadratic regulator with status feedback, which was used in the constant-speed control of LHG type rotary screen rack. It can be easily and quickly solve riccati...
Positive systems represent a class of systems whose state variables are nonnegative. This paper presents an ℒ1 adaptive controller for such systems. The control objective is to force the system output track a given nonnegative reference signal. In the analysis of the ℒ1 adaptive controller, we first show the positivity of the constructed reference system, and then demonstrate that the controlled system...
Shearlet is a new effective signal representation tool in many image applications. A novel image denoising scheme based on Shearlet transform and particle swarm optimization is proposed in this paper. Experiments show that the proposed scheme can remove the pseudo-Gibbs artifacts and image noise effectively. Besides, it outperforms the existing schemes in regard of both the peak-signal-to-noise-ratio...
Owing to the problem that particle swarm optimization algorithm is easily falling into local optima point in optimization of high-dimensional and complex functions. In this paper, a novel two sub-swarms exchange particle swarm optimization based on multi-phases(TSEM-PSO) is proposed. The particle swarm is divided into two identical sub-swarms, with the first adopting the standard PSO model, and the...
Particle swarm optimization and its modifications appear premature convergence for complex optimization problem, because particles' performance becomes same in seeking later period. In this paper, a new model is proposed to avoiding particles' performance same and possessing strong exploration capacity. Considering exploration and exploitation capacity diverse in different stage, the particle swarm...
Particle swarm optimization and its modification for two sub-swarms exchange appear premature convergence for complex optimization problem, because particles' performance becomes same in seeking later period. Therefore, in this paper, a modified two sub-swarms exchange particle swarm optimization is proposed. The particle swarm is divided into two identical sub-swarms, with the first adopting the...
In this paper, a Two Sub-swarms Quantum-behaved Particle Swarm Optimization Algorithm Based on Exchange Strategy (TS-QPSO) is proposed. Two sub-swarms of particles with quantum Behavior are set up in TS-QPSO. Once the whole swarm falls into local optima and the best value of the global swarm is not improved after the allowable iterations, the exchange strategy will be carried out. The amount of exchange...
In this article, on the basis of Porter's competitive forces model, a competitiveness model of public transportation is proposed. Then several visualized indexes are selected and structural equation model is applied to calculate. At last, the quantitative result with high degree of fitting is calculated through AMOS software, which can be used in the policy making and implement of public transportation.
We observed structure and form of adult anulus fibrous of lumbar intervertebral disc at fibrous layer level. Anulus fibrosus of lumbar interverbral disc was delaminated microsurgical technique. 8 testing points were taken in each layer and the angles between their fibers going and horizontal plane were measured. We got the results: Fiber going angle at each measurement point ceaselessly increased...
A method in this paper, which the theory of planar analytic geometry is used to model and simulate in vehicle transmission shaft, is firstly presented. This method is clear, uncomplicated and lucid, which offers a more convenient way to analyze vehicle transmission shaft kinematics characteristic so that it is suitable for project designs. The Matlab software is used to make the simulation in vehicle...
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