We design a T-Shaped wavelength division de-multiplexer in two-dimensional (2D) photonic crystal based on the coupling resonance characteristics. In this structure, three high effective and relative narrow bandwidths optical wavelengths (1 310, 1 440, and
sparse coding method, which can effectively reduce the dimension of the neuronal activity and express neural coding. Multichannel spike trains were recorded in rat prefrontal cortex during a work memory task in Y-maze. As discrete signals, spikes were tra