Gamagori, Japan

Aichi University of Technology is a private university in Gamagōri, Aichi, Japan. The school opened as a junior college in 1987. It became a four-year in 2000. Wikipedia.

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Shiina Y.,Aichi University of Technology | Hishida M.,Chiba University
International Journal of Heat and Mass Transfer | Year: 2010

The critical Rayleigh number Ra C at the onset of natural convection was studied by linear stability analysis for high porosity anisotropic horizontal porous layers of uniformly arraying vertical thin circular wires stretched across a hot and a cold surface. Navier-Stokes equations including flow resistance by the wires were solved since Darcy's law cannot be applied due to high porosity. Ratio of permeability in the horizontal direction to the vertical direction is constant to be 0.5 but ratio of effective thermal diffusivity ξ is changed dependent on wire materials. The critical Rayleigh number Ra C for the case of ξ = 1 obtained by the analysis agreed well with the experiment. © 2009 Elsevier Ltd. All rights reserved.

Nakagawa T.,Aichi Institute of Technology | Mizutani S.,Aichi University of Technology | Chen M.,Chaoyang University of Technology
Reliability Engineering and System Safety | Year: 2010

Some systems work for a job with random working times. It would be useful for such systems that they are checked at the completion of working times to detect their failures, which is called a random inspection policy. Two inspection policies, where a system is checked at periodic or successive times and also at every completion of working times, are considered. The total expected costs until the detection of failure are obtained, and when the random working time is exponential, optimal inspection policies which minimize them are derived analytically. Furthermore, the inspection policy where the system is checked only at every completion of N th working time is proposed. Finally, as one of modified random inspection models, the backup model where the system goes back to the latest checking time when it has failed is taken up and analyzed, by using the inspection policy. © 2010 Elsevier Ltd. All rights reserved.

Goto N.,Tokushima University | Miyazaki Y.,Aichi University of Technology
Japanese Journal of Applied Physics | Year: 2010

Wavelength-selective optical processing using collinear acoustooptic (AO) switches will be useful in photonic routing systems. We have studied the applications of this processing to optical label recognition in label routers. We propose the recognition of hierarchical routing labels encoded in the binary-phase-shift-keying (BPSK) format using an AO processor consisting of optical delay waveguides and parallel double-stage AO switches. Using wavelength-multiplexed hierarchical labels, simple processing using the AO processor can be realized. The recognition characteristics are analyzed and numerically confirmed by computer simulation. © 2010 The Japan Society of Applied Physics.

Large numbers of studies have focused onmicrorobots and numerous contests are held annually to develop microrobot technologies. These activities have resulted in that various types of microrobots have been proposed. They include motor, piezoelectric-element, and electromagnet microrobots. We consider a mechanism of movement and a method of control for an electro-magnet microrobot that both runs in a straight line and turns using a single electromagnet coil by adjusting the direction of the robot's permanentmagnets and the input voltage applied to the electromagnet coil. The microrobot's straight running forward is modeled mathematically and its motion features are studied on horizontal and inclined planes through simulation and some experiments. In addition, turning characteristics is studied using an experiment.

Tamano S.,Nagoya Institute of Technology | Itoh M.,Aichi University of Technology
Journal of Turbulence | Year: 2012

The drag-reducing effect of a spanwise-traveling wave with wall deformation on a zeropressure-gradient turbulent boundary layer over a flexible sheet was investigated. The test plate placed in the wind tunnel consisted of a flexible sheet section, where the traveling wave motion was generated by a vibration device with a crank via upstream and downstream smooth rigid wall sections. Streamwise and wall-normal velocity components were measured by single and cross hot-wire anemometers. Amplitude and frequency of the spanwise-traveling-wave motion were measured using two laser displacement sensors. The drag reduction ratio was estimated from the friction coefficients through the growth rate of the momentum thickness of the turbulent boundary layer over the flexible sheet section. A maximum drag reduction ratio DR of up to 13% was obtained. The relations between sheet displacement and streamwise and wall-normal velocity fluctuations were compared at a large DR (DR = 8%) and at a very small DR (DR = 2%), which was almost the same as the no drag reduction case, taking into account the experimental uncertainty. For the larger drag reduction, a slow-velocity fluctuation with large amplitude appeared further away from the flexible sheet. Quadrant analysis of streamwise and wall-normal velocity fluctuations revealed that the drag reduction was attributed to a reduction in the sweep event and an increase in the negative contribution of the inward-interaction event to the Reynolds shear stress due to the sheet displacement fluctuation. © 2012 Taylor & Francis.

Miyazaki Y.,Aichi University of Technology
2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings | Year: 2013

Transverse interactions between optical modes and surface acoustic waves (SAW) in optical waveguides with acousto-optic effects yield optical mode conversions and switching with high speed responses of nano seconds. Eigen mode characteristics of electromagnetic fields in A-O waveguides are studied for transverse A-O interactions, by Mathieu function expansion method. Mode couplings in optical devices consisting of two parallel A-O waveguides by transverse SAW, are discussed based on eigen mode characteristics of transverse A-O interactions. © 2013 IEICE.

Isogai M.,Aichi University of Technology
Journal of Robotics and Mechatronics | Year: 2014

We have been studying the mechanism and control method for electromagnet-type microrobots that have a volume of 1 cm3. Running straight and making turns with just a single electromagnet coil is the feature of the microrobot I developed. Newly developed micro-robot is controlled by a wireless remote controller using the difference in the vibration characteristics of the left and right legs of the microrobot.

Spatiotemporal receptive fields of direction selective cells, or cells whose responses are selective to direction of motion of visual stimuli, were investigated theoretically. A learning algorithm for a spatiotemporal receptive field of a model visual cell was derived according to an information maximization principle. It was assumed that the model visual cell receives input from nonlagged and lagged model LGN neurons. According to the algorithm, model cells were trained by using computer-generated moving images as training data. After the training, cells tuned to various directions of motion were generated. Also, generated synaptic weight patterns of the cells were similar to Gabor wavelets and receptive fields of simple cells in the visual cortex. Thus, they were orientation and spatial frequency selective as well as direction selective. © 2013 Elsevier B.V.

Miyazaki Y.,Aichi University of Technology
Progress in Electromagnetics Research Symposium | Year: 2012

For medical image diagnosis assisted by computers, computer tomography technologies using X-ray, optic and electromagnetic beam waves as incident waves have been rapidly developed.Incident beam waves scan in transverse cross sections of biological organs to get interior medical image information.Wave CT technologies are developed by inverse Fourier transforms for beam wave attenuations along beam propagation axises.Beam transverse scanning is based on spatial sampling theorem for transversely scanning of incident beam waves.Similar principle in space as sampling theorem in time is expressed by eigen function expansions of beam fields.In spatial case, electric field may be expressed as super-position of local field sampling data, using local eigen functions with spatial unit element distances.In free space, asymptotic Hermite Gaussian functions for rectangular coordinates can show local beam eigen functions.Based on spatial sampling theorem, precise image reconstruction theory of electromagnetic CT method is shown, discussing scattering and mode couplings in virtual waveguide arrays.

Miyazaki Y.,Aichi University of Technology
Progress in Electromagnetics Research Symposium | Year: 2013

Among several optical devices, fundamental characteristics and processing systems of collinear optical switching device have been studied about optical dielectric waveguides on LiNbO3 crystal substrates. Conventional waveguide-type A-O devices use collinear interaction with mode coupling based on Bragg condition between optical waves and SAW both propagating in same directions. Collinear A-O devices of waveguide-type show sufficient performance for wavelength selective switching with narrow bandwidths. However, in these collinear A-O devices, since SAW propagation speed is very slow, interaction time is several micro seconds for 10mm waveguide device length. In A-O devices of optical waveguides using transverse A-O interaction, where SAW propagates transversely and at right angles to optical wave propagation direction, SAW propagation lengths needed for complete A-O interaction may become 10 μm and interaction time may be several nano seconds, with ultra high speed switching. In this paper, fundamental characteristics of transverse A-O interaction are studied as electromagnetic boundary value problem. Refractive indexes in optical waveguides induced by A-O effects with SAW are shown by sine functions. Wave field characteristics in inhomogeneous media of periodic structures for transverse directions given by A-O effects are analyzed by analytic method of Hill's equations for transverse spectral functions. Electromagnetic fields in core and clad regions with periodic structures are shown by Mathieu functions. By boundary conditions, eigen equations of transverse type A-O waveguides are derived. Dispersion characteristics of A-O eigen modes are studied for wavelengths of optical waves and SAW, with acousto-optic coefficients for stable pass and unstable forbidden bands. Based on these fundamental field characteristics of A-O waveguides, mode couplings and switchings in transverse A-O waveguide devices consisting of coupled several optical waveguides controlled by SAW may be shown. Copyright © 2013 The Electromagnetics Academy.

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