[in Japanese]

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The effect of liquid binder on the film properties of screen-printed MgO film for the protective layer for AC-PDP has been studied. The liquid binder is a stabilized magnesium diethoxide solution which changes to MgO after firing and binds the MgO particles. After drying, the MgO film thickness increases with increasing MgO liquid binder content. However, after firing, the MgO film thickness decreases with increasing MgO liquid binder content, because the MgO powder content decreases with increasing liquid binder content. When liquid binder content is less than 10 wt%, surface roughness of the MgO film increases and film density decreases with increasing liquid binder content. This is caused by a gas generated by the liquid binder. When liquid binder content is more than 10 wt%, the surface roughness of the MgO film decreases and film density increases with increasing liquid binder content. This is caused by the liquid binder combining powders. Therefore, it is concluded that the optimization of liquid binder content is very important for improving film properties.

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The proposed system consists of a semi-spherical reflector, set on the ceiling of a room, and a pair of dual circularly polarized antennas for transmission and reception of communication. The system has a simple construction because the relay station, using a semi-spherical reflector, has no electronic devices, and needs no electric power supply. The paper describes the principle of the system and gives examples of the link design. The scattering characteristics of the semi-spherial reflector are investigated by using the physical optics method, and the results are confirmed by experiment. Finally transmission tests of a PN code are demonstrated by using the proposed antenna system.

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This study was motivated by an interesting property reported in MST neurons : their directional selectivity to optical stimuli was reversed as the area of stimuli was expanded. We considered these neurons play an important role in figure-ground discrimination, and attempted to make a neural network model to reproduce the reversal of directional selectivity. We used other model neurons in areas MT and MST with physiological relevant properties. The simulation of the model showed that it could elaborately mimic such reversal. We argued that the 'reversal' cell in area MST would indicate the direction of a target against a moving background. We also discussed the roles of other model neurons in motion detection.

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The problems with conventional designing conditions and design methods for Half-band FIR (Finite Impulse Response) filters are discussed first. Then a new design method and the qualitative formation of a new designing condition are explained. This new method can be applied to not only low-pass filters but also bandpass filters, band eliminating filters, and Mth-band filters.

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