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The nonlinear control system on Kahler manifold is studied by using differential geometric theory of nonlinear control system. The representation of the state equation of nonlinear control systems on the local coordinate of Kahler manifold is given. The relationship between equilibrium of nonlinear systems and geodesic of Kahler manifold considered by using the property of geodesic. At last, the local...
A special kind of port-controlled bilinear Hamilton system is researched. The controllability distribution and observability codistribution of the kind of port-controlled bilinear Hamilton systems are disused by using differential geometric of nonlinear control system. Lie brackets between input vector field and control vector field, Lie derivative of output function along input vector field and control...
Aim at robustness and efficiency of traditional Dynamic Graph Watermark (DGW), a DGW-AB algorithm based on threshold scheme is proposed, in which the idea of secret sharing to the software watermarking is introduced. Experimental results have shown that the proposed method can make up the weakness of CT algorithm, and prevent invaders from getting the original watermark.
Modern anti-ship mines can be detonated by the electromagnetic signature of a surface ship [1]. For this reason, it is desirable to have simulation methods to study the propagation of extremely low frequency (ELF) electromagnetic waves under water. The finite-difference time-domain (FDTD) method [2-5] is one of the most widely used methods in electromagnetic simulation. Unfortunately, the discrete...
This letter describes the application of the finite-difference time-domain (FDTD) method to the simulation of extremely low frequency (ELF) electromagnetic signals under water. This requires substantial modification to the traditional FDTD method, as well as the development of an analytic method needed to verify the accuracy of the FDTD method.
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