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The complex dynamics of an autonomous prey-predator system with impulsive state feedback control is studied. The sufficient conditions for the existence and stability of semi-trivial are obtained by using the Poincare map. Numerical simulations show that the complex dynamics of system we considered, including the doubling-bifurcations, chaos, etc.
A more efficient robust watermarking algorithm based on DCT is proposed in this paper. The strength parameter of watermark in some approaches proposed is determined by experiments, we aim at establishing a mathematical model for hiding data in host image. By modifying the relationships between the selected middle-frequency coefficients and standard variance of DCT coefficients, watermark is embedded...
A way to apply the metamorphic theory to the design of gripper transfer system is proposed. The characteristic of multi-degree of freedom at the different work-stage of the gripper transfer system is analyzed. To achieve gripper transfer system's function we can design the origin mechanism units and then combine them according to the metamorphic mechanism. This is a new and valid method to the configuration...
This paper presents some key issues in fiber-optic interferometric magnetic field sensors. Practically applicable methods to design and implement fiber-optic Michelson interferometer and transducers are described with experimental verifications. Detection scheme of traditional hardware demodulation is improved, and a new software demodulation method is addressed. Transducers were implemented by using...
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