Kazushi Ishihara

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We have successfully achieved high speed (~50 ns) unipolar operation in RRAM devices comprised of titanium oxynitride (TiON) combined with a control resistor connected in series. For unipolar switching, programming and erasing pulses can be the same width, typically, a few tens of nano-seconds. This enables high speed and high density cross-point RRAM(More)
Sound-imitation words, a sound-related subset of onomatopoeia , are important for computer-human interaction and automatic tagging of sound archives. The main problem of automatic recognition of sound-imitation word is that the literal representation of such words is dependent on listeners and influenced by a particular cultural history. Based on our(More)
Environmental sounds are very helpful in understanding environmental situations and in telling the approach of danger, and sound-imitation words (sound-related onomatopoeia) are important expressions to inform such sounds in human communication, especially in Japanese language. In this paper, we design a method to recognize sound-imitation words (SIWs) for(More)
A digital control technique is proposed to obtain sinusoidal three-phase PWM (pulsewidth-modulated) inverter output. Sensing two line-to-line voltages the required pulse patterns for deadbeat response are computed in real time, based on the predicted voltages by an observer at 18 kHz sampling frequency. This closed-loop voltage control inherently results in(More)
This paper focuses on recognition of repeats in continuous environmental sounds. Environmental sounds, that are very informative in our daily lives, often repeat several times. Repeat recognition for environmental sounds is essential for compact representation of those sounds and for forecasting the future. In our method, input environmental sound signal is(More)
Onomatopoeia, or sound-imitation words (SIWs) are important in informing sound events in human-computer communication. One problem is listener-dependency in recognizing environmental sounds by means of SIWs, that is, different listener hears the same environmental sound as a different SIW even under the same condition. Therefore, the use of usual Japanese(More)
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