Abstract: A big data-based price comparison service providing system using time-series analysis and price prediction is provided. A big data-based price comparison service providing system includes a user terminal and a price comparison service providing server including a big datafication unit, a database unit, and a search providing unit.

Abstract: Disclosed is a system for providing a big data-based AI automatic allocation matching service using taxi demand prediction. The system comprises a user terminal, a taxi terminal and a matching service providing server including a big datafication unit, a prediction unit, a transmission unit, a matching unit, and an alarm unit.

Abstract: The present disclosure relates to a variable helmet that can be unfolded flat and carried or kept when not in use. A configuration of the variable helmet is characterized by including a protective pad in which a plurality of unit pads are planarly coupled like a mosaic so that the protective pad is in a hemispherical shape to cover and protect a head of a wearer and is able to be unfolded flat like a plate, the protective pad having unevenness portions provided in a sawtooth shape at both ends thereof; both-end fixing means allowing the unit pads to have a hemispherical shape by tightening the both ends of the protective pad; and a chin strap allowing the protective pad to be fixed in a state in which the protective pad is covered on the head.