ETRI (Electronics and Telecommunications Research Institute)

Disclosed herein are a QR code-based authentication apparatus and method. The QR code-based authentication method includes, as a user authentication request is received from a user computer, transmitting, by a server, data required for QR code generation to the user computer, as the user computer generates and outputs a QR code, scanning, by a user mobile device, the QR code, and as an authentication request is received from the user mobile device using QR code scan information, performing, by the server, user authentication, wherein the user computer includes a web browser and an application module, and performs user authentication by verifying whether public Internet Protocol (IP) addresses of the user mobile device, the web browser, and the application module are identical to each other.

The present disclosure provides an adaptive complex positioning method and apparatus which may combine measurement information about a wireless communication infrastructure, installed near a take-off and landing point of air mobility, with information obtained from a sensor equipped in air mobility and may thus have high position accuracy in a complicated center of a city also, in order to solve a problem where the position accuracy of a conventional global navigation satellite system (GNSS) is lowered in a complicated center of a city.

Disclosed is a wireless communication system using multiple transmission and reception points. In a wireless communication system having a first transmission and reception point and at least one second transmission and reception point belonging to the same cell, the first transmission and reception point has a wider transmission area than the at least one second transmission and reception point, and the first transmission and reception point and the at least one second transmission and reception point generate downlink transmission signals by using the same physical layer cell ID or virtual cell IDs allocated to each terminal, and then the terminals generate uplink transmission signals by using the allocated virtual cell IDs.

A method by which a terminal operating in an unlicensed band transmits a signal comprises the steps of: receiving, from a base station, configuration information about a carrier; receiving configuration information for configuring N (where N is an integer) guard band(s) for some frequency domains of the carrier; and transmitting a signal to the base station by using a first frequency domain of a bandwidth part belonging to the carrier, wherein the first frequency domain can be a domain excluding the N guard band(s) from the frequency domain of the bandwidth part.

Disclosed herein is an apparatus and method for optimizing a logical quantum circuit. The apparatus moves Pauli operations just before a final logical measurement operation within a logical quantum circuit by performing a Pauli frame, generates an optimization block on a block basis by separating logical operations within the logical quantum circuit into sections, rearranges the order of logical operations within the optimization block, merges consecutive logical operations, among the rearranged logical operations, and sets consecutive logical operations within the logical quantum circuit to be performed in parallel.

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Disclosed herein is a method for storing blockchain transaction data. The method includes selecting at least one block file storing blockchain transactions as an encoding block file target, generating encoded chunks including parity chunks using the encoding block file target, and making at least one of the encoded chunks correspond to at least one of blockchain nodes to store at least one of the encoded chunks.