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In underwater vehicles controlled by thrusters and fins, effect of the AUV depth control could be seriously affected because of dead zone nonlinearity in steering gear transmission system. This paper takes a certain AUV as an example. In this paper, a nonlinear pid controller is desired in considering of the actuator being saturated; response speed of the actuator is improved through tracking differentiator;...
The security of an MH plaintext is intended to be based on the subset sum problem (SSP). However, when the density of a knapsack is less than 0.9408, SSP can be solved in polynomial time through the LLL lattice basis reduction algorithm for seeking the shortest non-zero vector in a lattice. In this paper, we discuss the method of attack on the MH cryptosystem, and analyze the effect of the length...
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