[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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This paper presents a new method for measuring reflection characteristics of building materials for TV broadcasting wave using a small sample of which dimensions are about one wavelength. The effect of incoming wave is cancelled out by using a hybrid junction combined with two antennas. Then the true reflection from the sample is extracted from measured data after removing the effects of multi-path reflections by means of a linear displacement of the sample. Both normal and oblique incidence of waves can be handled.
The principle and the subsequent error analysis are confirmed first by an experiment at 5 GHz using samples which are larger than and comparable with a wavelength. Then, reflection characteristics of a few samples are measured at 200 MHz, utilizing a TV broadcasting wave. A decay of reflection due to curing of concrete is detected.

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Among the number of known psychological effects associated with the variation of display size, Realistic Feeling induced by wide screen display is the most familiar and important one.
The authors have studied the nature of this effect both by a psychophysical method in which the induced effect in direction sensation of the observer is measured using a hemispheric display, and by the conventional subjective evaluation method.
It is shown by the experiments that the induced effect increases logarithmically with the display angle and that, for a narrow angle of display which is less than 20° in visual angle, the measure of Realistic Feeling is very small and it saturates as the display angle reaches above 80°.

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