LCD-TV表面のアンチグレア（ＡＧ）処理のヘイズ度及び部屋の照度、照明の色温度を振って、３種の写真画像の綺麗さ、映りこみの気になり度を７段階評価尺度で主観評価し、綺麗さ、映りこみの気になり度に対するＬＣＤ－ＴＶ表面のヘイズ度、照度の満足限、許容限を求めた。リビングの典型的照度100lxにおいて、綺麗さに対する満足限はヘイズ度２％以下、許容限は２０％以下であるのに対し、映りこみの気になり度の満足限はヘイズ度１２％以上、許容限は０％であったことから、最適な表面処理はクリア（ツルツル表面）の反射防止処理付であることが分かった。

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Doppler effect of ultrasonic wave offers a system of measuring the speed of sands suspended in water. The design of this system demands the estimation of ultrasonic target strength of sands suspended in water. Furthermore, it seems that scattering of ultrasonic wave from the reveals their volume concentration and distribution in size. Then, this paper deals with a measuring method of the ultrasonic target strength of sands suspended in water. The amplitude of received signal is changing widely as the sample is rotated. This change seems to be caused by interference of the scattered waves from the particles. Statistical analysis on this interference leads to a result that the rms value of 36 measured sound pressure values gives the effective scattered sound pressure with about 10% in deviation. When the sample is placed in the neighborhood of transmitter and receiver, the received signal decreases, Compensation of this reduction is also described.

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