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In this paper, a reversible authentication scheme based on prediction-error expansion (PEE) is proposed. Firstly, the compound symbolic chaos sequence as well as image block pixel bits and position-bits are input into a hash function to produce hash-bits. Then exclusive-or operation, between the label-bits taken from the chaos sequence and hash-bits, is performed to generate the check bits, which...
A model is developed for bistatic bottom reverberation in the deep ocean, which includes the propagation and scattering processes. The two-way propagations from the source to scatterer and the scatterer to receiver are described by ray theory. The sound speed profile in the deep ocean is taken into account for the accuracy. The scattering intensity is assumed to be a sum of the roughness-scattering...
A method is developed and introduced into simulation of waveforms scattered by a spherical shell covered by a visco-elastic layer. Both forward and backward scattered waveforms are investigated. Comparisons of the results and those without the visco-elastic layer show that the forward scattering strength is hardly affected by the visco-elastic layer no matter in a low or a high incident frequency,...
Inversion of modal dispersion curves is an effective method for obtaining underwater acoustic parameters. In this paper, an inversion scheme for synchronously obtaining the sound speed profile and bottom parameters using two wideband explosive sound sources is proposed based on modal dispersion characteristics. First, the first three orders of empirical orthogonal functions were determined and used...
The integration of various networks which adopt different wireless access technology can improve wireless transmission performance and provide mobile users with always best connection. Vertical handoff is the foundation of the integration of the heterogeneous wireless network. In the process of vertical handoff, handoff algorithm is an important part, directly determining handoff performance. Considering...
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