Research subjects as a hobby

Bowed string

Logistic map and scratching sound

Listen to the sound of twinkling stars

Where the 4-digit number 2020, the year of Tokyo Olympic and Paralympic Games appears in the 10 thousand digits of π?

How about the year 2025 of Osaka expo?

Logo of Tokyo 2020 and rhombus puzzle

Introduction to signal processing

signal processing with scilab

Designs of 12 signs of the Chinese zodiac

2024Dragon〜2011Hare