Author Archive: DongJoon

Multiple Reflections

What is Image? Our eyes are designed to sense where the light started. Even if the light did not actually start there, our eyes say there is an ‘image’. There are a lot of ‘images’ when you look at the…
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파동의 전파 Wave Propagation

Wave Propagation

In science, a wave is a phenomenon in which energy is transmitted through the medium. Only energy is transmitted through the waves. The medium that participates in the vibration only vibrates and does not actually move. Not all waves require…
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하이포사이클로이드 Hypocycloid


A hypocycloid is a special plane curve generated by the trace of a fixed point on a small circle that rolls within a larger circle. If the radius of a large circle is R, and the radius of a small…
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에피사이클로이드 Epicycloid


Epicycloid refers to the trajectory drawn by a vertex on a small circle when a small circle is rolled outside a large circle. The radius of a large circle is denoted by R, the radius of a small circle is…
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사운드 분석 - 진동수와 음량

Sound Analysis

What is the main frequency of the sound around us? This simulation works on Microsoft Edge , not Internet Explorer, FireFox, Chrome, Safari, Opera. Please allow to request access to the microphone.