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A capacity variable watermarking algorithm for 2D engineering graphic based on complex number system is proposed. The coordinates of vertices in the engineering graphic are extracted to construct complex signals, which are transformed by Fourier transformation. The watermark sequence will be selected m bits each time to have a transformation under complex number base, then the real part and imaginary...
A multiple encryption algorithm is proposed for 2D engineering graphic based on Fourier descriptors and chaos scrambling. The specific coordinates of vertices in the 2D engineering graphic are extracted to construct the corresponded complex signals, which are in turn transformed by Fourier transformation, then bit XOR operation is used between the FFT magnitude coefficients and a binary sequence,...
In all-optical networks with no wavelength conversion, signals must travel on the same wavelength over possibly very long distances. During transmission, the QoS of signals as measured by their Bit Error Rates is degraded not only by the propagation through fibers, but also by small optical leaks from other signals called crosstalk that occur in the nodes and cannot be removed at the physical layer...
The pulsed electro-acoustic (PEA) method is widely known to be an excellent method for measuring the space charge distribution that accumulates in thick solid dielectric materials. One of the most important conditions for developing the measurement technique is that a high-voltage pulse (>400 V, pulse width<20 ns) must be easy to generate. In this paper, a new high voltage pulse generator using...
It has been observed that voltage waveforms generated by power electronic converters may affect significantly the reliability of electric motor insulation. The electrical characterization of magnet wire for electric motor has been carried out through aging tests under different aging time. We have measured the space charge parameter (e.g., the number of charge, trapping energy) in magnet wire under...
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