Road to development of the piezoresistive semiconductor pressure sensor is verified retroactively. There was a sixty year's history of the past. In this paper, it is explored the path of technological innovation in semiconductor pressure sensors, which are the basis of pressure sensors that are indispensable for automobiles today.
QR code, an abbreviation for Quick Response code, was developed and published three decades ago. It was originally designed for production and logistics industries with advantageous characters: 1) high-speed readability, 2) flexibility for reading angles, and 3) robust readability against noise. In this paper, structure of code and encoding/decoding process will be introduced.