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This ‘check room' system let us know the percentage of population in the subway or train before we board, it would resolve the inefficiency of finding the relatively pleasant room. Also, as it can distribute the population in an effective way, it will make our lives more convenient.
After check the occupied part of the person each room, it is converted percent, and identify persons.
It will sended to the station, you can confirm at the gate.
Daejun, South Korea