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In this proceeding, we introduce peristaltic gel actuators as a chemical robot. The polymer gels prepared here have a cyclic reaction network like metabolic process in itself. With a cyclic reaction, the polymer gel swells-shrinks autonomously. The periodic self-oscillating motion of the gel is produced by the dissipating chemical energy of the oscillatory Belouzov-Zhabotinsky (BZ) reaction. We have...
We propose a delegation function on Web-based applications federated with a single sign-on system, in which users are authenticated by their electronic certificate, based on SAML protocol. The function enables a delegatee to access Web-based business applications instead of delegator. In order to realize the function, we first design the contents and issuing process of the electronic ''delegation...
A hybrid spiking neuron is a wired system of shift registers and behaves like a neuron model. The neuron exhibits various bifurcation phenomena and response characteristics for a stimulation spike-train input. In this paper we formulate some typical bifurcation mechanisms and clarify these mechanisms by using discrete/continuous hybrid maps. Based on the analysis results, we can clarify mechanisms...
epsiv-filter can reduce most kinds of noise from a single-channel noisy signal with preserving the signal that varies drastically such as a speech signal. The filter design is simple and it can effectively reduce noise. It can reduce not only stationary noise but also nonstationary noise. However, it has some parameters and we need to set them appropriately based on empirical control. So far, there...
This paper describes an algorithm for internal noise reduction from dependent mixtures of microphones and a piezoelectric device under blind condition. The features of our approach are summarized as follows: (1) The purposed method handles internal noise reduction of the acoustical array combining microphones and a piezoelectric device in the time domain. (2) It can reduce the internal noise from...
Band-pass bilateral filter is an improved bilateral filter which does not have low-pass characteristics but has band-pass characteristics to enhance image contrast around edges. However, the computation time is relatively large due to Gaussian calculation in all pixels. To reduce the calculation cost, we look to a nonlinear filter called epsilon-filter and propose an advanced epsilon-filter which...
This paper describes a blind separation algorithm of monaural sound based on peak tracking of frequency spectra. We have already reported a blind separation method based on the change ratio of frequency components. However, it cannot handle a signal with frequency fluctuation such as a speech signal or a vibrato tone, because such type of signal is regarded as the mixture of different sounds. Our...
This paper describes noise reduction based on a bilateral filter improved for an acoustical signal. A microphone array system has been utilized in various scenes. However, when we utilize the microphone array system in life space, the problem of back ground noise arises. Although the back ground noise is not always stationary, statistically independent or disjoint, the amplitude of the noise is usually...
This paper deals with the high-precision positioning control of a dual-stage feed drive. The control system is constructed using an equivalent-input-disturbance approach to improve the disturbance rejection performance. The design procedure is explained, and a numerical example demonstrates both the validity of the method and its advantages over a method based on a disturbance observer.
epsiv-filter can reduce most kinds of noise from a single-channel noisy signal with preserving the signal that varies drastically such as a speech signal. It can reduce not only stationary noise but also nonstationary noise. However, it has some parameters whose values are set empirically. So far, there are few studies to evaluate the appropriateness of the parameter setting of epsiv-filter. In this...
This paper presents a model-based ultra-precision stage control that utilizes a contact-type non-resonant ultrasonic actuator. The linear actuator is the synchronous piezoelectric device driver (SPIDER), which has the strong non-linearity due to the friction drive mechanism. Therefore, the friction characteristics are at first experimentally evaluated. Next, focusing on the non-linear property of...
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