Faculty Profiles - MAEDA Yoshinobu

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Consideration on Recognition of Block-type 2-D Bar Code

NAKAMURA Hideo, MAKINO Hideo, YAMAMIYA Shiro, MAEDA Yoshinobu, HIRONO Mikihiko

Technical report of IEICE. HCS 98 ( 503 ) 1 - 8 1999.1

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

An"easy-to-use"block-type two-dimensional bar code, based upon error-correcting codes and code concatenation, has been developed.The configuration of the bar code could be changed by using sub-sets of the unit block.Furthermore, it was possible to decode under various conditions including change of slope, rotation, distortion, fragmentation, and also when a part of the bar code was missing.In this paper, the recognition characteristics for several slopes and rotations was experimentally evaluated.Also, we were able to show that"the redundant encoding process"had high recognition properties for the bar code, when using printed fragments of a paper sheet, the complex surfaces of an object, and even when scanning the image on a T-shirt.

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Consideration of Program Transmission Method in Implantable Stimulator

SONE Hiroyuki, MAKINO Hideo, MAEDA Yoshinobu, KITAMURA Masakazu, SATO Eiichi

IEICE technical report. ME and bio cybernetics 98 ( 309 ) 21 - 27 1998.9

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

The purpose of implantable stimulators is the recover of organism function, through electrical stimulation of the internal body part. Battery capacity determines the term of implantation. The battery is contained in a titanium housing and this makes battery exchange difficult. It is therefore necessary to minimize the electrical power consumption of the stimulator, even during the signal communication period between the stimulator and the program transmitting device (the programmer). In this paper we adopt the resonant communication method, in which the power consumption is suppressed in the communication from the stimulator to the programmer. We studied the communication properties in two cases. In the first case the transmission-receiving coil of the stimulator is set in the titanium housing. In the second case the coil is set in the epoxy resin portion of stimulator. As a result, resonant communication in the first case was not possible but in the second case it was possible to communicate when coil arrangements were within 20mm distance with a 10mm horizontal gap between the stimulator and the programmer.

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Twisted homoclinic orbit in reduced Hodgkin-Huxley equations

FUKAI Hidekazu, MAEDA Yoshinobu, PAKDAMAN K., NOMURA Taishin, SATO Shunsuke

IEICE technical report. Nonlinear problems 98 ( 45 ) 49 - 56 1998.5

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

The various responses exhibited by the four-variable Hodgkin-Huxley equations when the input current is changed can all be reproduced by two variable reduced models. However, when the parameter representing the potassium reversal potential is also modified, dynamics, such as twisted homoclinic orbits appear that are inherently of dimension higher than two. In this work, we show that, in this case, it is still possible to reduce the HH equation to a three variable system. Our analysis suggests that global bifurcations such as twisted homoclinic bifurcation and period doubling can be preserved in the reduction process.

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On reduction of neuron models

MAEDA Yoshinobu, PAKDAMAN K., NOMURA Taishin, DOI Shinji, SATO Shunsuke

生体・生理工学シンポジウム論文集 12 81 - 84 1997.9

Response characteristics of excitable cell models to bursting inputs.

MAEDA YOSHINOBU, DOI SHINJI, NOMURA TAISHIN, SATO SHUNSUKE

生体・生理工学シンポジウム論文集 11th 73-76 - 76 1996.11

Reduction of the bursting neuron model and analysis of the dynamics.

MAEDA YOSHINOBU, DOI SHINJI, NOMURA TAISHIN, SATO SHUNSUKE

生体・生理工学シンポジウム論文集 10th 461-464 - 464 1995.11

Nonlinear Dynamics of the Bursting Neuron Model

MAEDA Yoshinobu, DOI Shinji, NOMURA Taishin, SATO Shunsuke

IEICE technical report. ME and bio cybernetics 95 ( 84 ) 85 - 92 1995.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A bursting discharge is one of the most typical temporal behaviors of neurons. A bursting neuron repeats periodically or non-periodically two phases ; an active phase in which impulses are successively produced and a silent phase in which no impulse is produced at all. In this paper, nonlinear dynamics of spontaneous bursting discharges is investigated by means of a model of bursting discharges (a bursting neuron model) from a point of view of dynamical system theory.

Reduction and phase space analysis of the Onchidium pacemaker neuron model

Maeda Yoshinobu, Doi Shinji, Nomura Taishin, Sato Shunsuke

IEICE technical report. ME and bio cybernetics 94 ( 80 ) 25 - 32 1994.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Hayashi et al.presented a Hodgkin-Huxley type neuron model with eight variables as the model of mollusk Onchidium pacemaker neurons which showed several oscillatory phenomena such as beating and periodic or chaotic bursting discharges.In order to study the dynamical behavior of the pacemaker neuron model,we derive a three- variables reduced model from the original neuron model using the reduction method proposed by Kepler et al..Then,using the nullcline in the three-dimensional phase space,structures of the periodic orbit corresponding to beating and bursting discharge are studied.

Two-dimensional bifurcation diagram of Hodgkin-Huxley model

Maeda Yoshinobu, Doi Shinji, Sato Shunsuke

IEICE technical report. ME and bio cybernetics MBE93 - 22 1993

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Two-dimensional bifurcation diagram with respect to two parameters,namely,current pulse intervals and current pulse intensity normalized by threshold current,are investigated for the response sequences of Hodgkin-Huxley model driven by periodic pulse trains.Results are compared qualitatively with those of the electrophysiological experiment reported by Takahashi and others. Effects of the temperature parameter on the bifurcation diagram are also considered.

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