A Method of High-Precision Frequency Detection with FFT

SUMMARY Except for the nonlinear complex method such as MEM, there has not been known a method to determine the frequency with a high accuracy from the short wave train. Generally, it is considered that the frequency resolution in FFT is of the order of the step in the frequency. This paper attempts to derive a correction formula for FFT results by which the frequency, amplitude and phase of the arbitrary input signal with discrete frequencies can be calculated easily and with a high accuracy. The effect of the noise on the accuracy is discussed in the practical measurement condition, and it is shown by theory and numerical experiment for the case of whitenoise that the accuracy is linearly dependent on the noise ratio

「個人向け国債」を考える : 将来ビジョンの中での位置づけ

はじめに　1. わが国における国債発行の現状　2. 「個人向け国債」の特質　3. アメリカ貯蓄債権の概要　4. 「個人向け国債」の評価を考える　5. 証券教育の早期実施を

Public subsidies and the recommendation of child vaccines among primary care physicians : a nationwide cross-sectional study in Japan.

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