Abstract: A steering wheel includes a damper unit and an airbag cover configured to move, when a horn is activated, in a horn operation direction with respect to an airbag housing. The damper unit includes a damper made of insulating material coupled to the airbag housing, a switch assembly coupled to the airbag housing in an insulating state via the damper and coupled to the steering wheel to be continuously energized, and a spring. The spring is coupled to the airbag housing to be continuously energized and selectively electrically conducted with the switch assembly depending on whether the airbag cover is in contact with the switch assembly due to elastic deformation when the airbag cover moves in the horn operation direction.

Abstract: A Merkle tree-based data management method may comprise: aligning data into two-dimensional square matrix; calculating a hash value of each node of the two-dimensional square matrix; calculating hash values of each row of the two-dimensional square matrix; generating an additional column with nodes having the hash values of each row; calculating hash values of each column of the two-dimensional square matrix; generating an additional row with nodes having hash values of each column; and calculating a Merkle root by concatenating the hash values of the additional column and the hash values of the additional row.

Abstract: An apparatus and a method for payment using short range communication are disclosed. The apparatus includes an electronic device having a communication module configured to wirelessly transmit at least one piece card information to an external device, a sensor configured to sense an orientation of the electronic device so as to generate a first signal, a processor configured to be electrically connected the wireless communication module and the sensor, and a memory configured to be electrically connected to the processor and at least temporarily store first card information and second card information, wherein the memory, at the time of execution, includes instructions which instruct the processor to receive the first signal, select one of the first card information and the second card information, at least partially on the basis of the first signal, and wirelessly transmit the selected card information to the external device.