Hirokazu Yokoi

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Lorentz reciprocity is a direct consequence of Maxwell equations governing the propagation of light in passive linear media with symmetric permittivity and permeability tensors. Here, we demonstrate the first active optical isolator and circulator implemented in a linear and reciprocal material platform using commercial Mach-Zehnder modulators. In a(More)
The artifacts caused by various factors, EOG (electrooculogram), blink and EMG (electromyogram), in EEG (electroencephalogram) signals increase the difficulty in analyzing them. In addition, EEG signals containing artifacts often cannot be used in analyzing them. So, it is useful and indispensable to eliminate the artifacts from EEG signals. A neural(More)
Guinea pigs were exposed to a blast (maximum 1.0 kg/cm2) of nitrous gas for 0.2 s through the external auditory canal. Then, they were either killed immediately, 1 day, 3 days, 1 week, 2 weeks, or 4 weeks after exposure to the blast. The morphological changes of the cochlear sensory hairs were examined by means of a scanning electron microscope. Changes in(More)