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In electroencephalogram (EEG) brain-computer interfaces (BCI), the performance of systems deteriorates especially when the number of channels is larger. Therefore, it is important to select the suitable channels for classification of different motor imagery tasks. In this paper, the optimal combination of channels selection method is presented. Based on the l1 norm of common spatial pattern (CSP)...
Near-field intensity distributions of high-density amplitude gratings with period d=2.3λ and different duty cycles illuminated by TE and TM polarized waves are simulated by using the finite-difference time-domain method. Numerical results show that intensity distributions of in the grooves change differently when duty cycle varies for TE and TM polarizations. As duty cycle increases, peak intensity...
During the cutting machinepsilas work time, the wear of the cutting piece is a constant process of gradually wear. So it is difficult to ensure the accuracy and efficiency of processing. This paper introduces the principles and compositions of a linear CCD diameter measurement system, makes a non-contact automated on-line measurement for the grinding wheel diameter; as for the wear capacity of the...
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