[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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The extensive applications of the computer prediction of field strength are restricted, because of the tremendous amount of manual work needed to extract terrain height data from the topographical maps, and of the large computation time consumed to obtain ground profile data with satisfactory accuracy.
We have developed a system which free from these restrictions by using grid-coordinated terrain information prepared by the Geographical Survey Institute of the Ministry of Construction. The system efficiently predicts field strength with satisfactory accuracy, and can be accepted any point in Japan as transmitter and receiver sites.
We have investigated several efficient interpolation methods to reconstruct accurate profiles from grid-coordinated terrain information and the efficient method to handle a large amount of the terrain information in the computer system.
We confirmed that the calculated results were pretty close to the field measurement data.

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Hundreds of light intensity distribution images of a GaP green light emitting diode with preliminarily introduced dislocations have been recorded at regular time intervals and processed using digital image processing technique and it has been made possible to detect the slightest temporal variations of light intensity, which cannot be recognized by human eyes, as two-dimensional patterns.
It has been shown that non-uniform degradation rate distribution, which corresponds to the distribution of spatially localized defects such as dislocations, is based on the very slow movement of defects.

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