Abstract: Disclosed is a radar antenna including an antenna body including a first plate and a second plate; a slot radiation part and a slot reception part formed in the first plate; a transmission port and a reception port formed in the second plate; and a waveguide formed by assembling the first and second plates. The slot radiation part includes a first slot radiation part configured to radiate a radio wave in a first detection range, and a second slot radiation part configured to radiate radio waves in a second detection range having a larger width and distance than the first detection range.

Abstract: A method of providing user propensity analysis service using artificial intelligence-based fingerprints includes: generating a learning model for determining fingerprint types, configured to collect data samples including fingerprints through an execution of a program in a computing device, and determine at least 12 types of fingerprints through image analysis and artificial intelligence learning on the collected data samples; collecting data adapted to determine propensities of the fingerprints, then establishing determination data for determining the propensities for each of at least 12 or more types of fingerprints based on the determined propensities; when a fingerprint image of the user is input, applying the input fingerprint image to the learning model for determining the fingerprint type to determine the fingerprint type of the user; and generating user propensity information using the determined data for the fingerprint type and providing the user propensity information to the user.

Abstract: A method of estimating a channel of a base station in a communication system using an IRS may comprise: receiving a first signal through a direct path between a terminal and the base station from the terminal and a second signal through an indirect path through the IRS from the terminal; estimating a first angle of arrival of the second signal received from the IRS; estimating a second angle of arrival of a signal transmitted to the IRS by the terminal based on the estimated first angle of arrival; estimating a third angle of arrival of the first signal received from the terminal based on the estimated first angle of arrival; and estimating path gains on the direct path and the indirect path based on the estimated first angle of arrival to the estimated third angle of arrival.

Abstract: Provided are a database (DB) managing method and system, wherein, while forming an index of a DB, a lower value and an upper value of key values of a plurality of records included in one page are stored as separators and an overlapping part of the key values is deleted from the plurality of records by using the separators to save a storage space where pages of the index is stored, and thus the performance of the DB is improved.

Abstract: The present invention relates to a coding education system, and more particularly, to a coding education system using a drone which enables to more effectively operate a programming education for controlling a drone.

Abstract: The present invention relates to a moving object detection technique, and more particularly, to a real-time moving object detection method using a continuous wave radar that detects a moving object in real time using a Robust Principal Component Analysis through Gradient descent.

Abstract: A database management method generates an execution plan with respect to a factorized character string generated by factoring an execution value list of a query and storing the factorized character string and an execution plan identifier associated with the factorized character string. The method includes receiving a factorized character string generated from a query; determining whether the factorized character string is stored in a memory; transmitting an execution plan identifier matching the factorized character string stored in the memory when the factorized character string is stored in the memory; generating and transmitting an execution plan identifier with respect to an execution plan of the factorized character string when the factorized character string is not stored in the memory; receiving a query request consisting of the execution plan identifier and an execution value list included in the query; and providing a query result obtained using the query request.

Abstract: Provided are a database (DB) managing method and system, wherein, while forming an index of a DB, a lower value and an upper value of key values of a plurality of records included in one page are stored as separators and an overlapping part of the key values is deleted from the plurality of records by using the separators to save a storage space where pages of the index is stored, and thus the performance of the DB is improved.

Abstract: A database management method generates an execution plan with respect to a factorized character string generated by factoring an execution value list of a query and storing the factorized character string and an execution plan identifier associated with the factorized character string. The method includes receiving a factorized character string generated from a query; determining whether the factorized character string is stored in a memory; transmitting an execution plan identifier matching the factorized character string stored in the memory when the factorized character string is stored in the memory; generating and transmitting an execution plan identifier with respect to an execution plan of the factorized character string when the factorized character string is not stored in the memory; receiving a query request consisting of the execution plan identifier and an execution value list included in the query; and providing a query result obtained using the query request.

Abstract: Disclosed is a database management method which generates an execution plan with respect to a factorized character string generated by factoring an execution value list of a query and stores the factorized character string and an execution plan identifier with respect to the factorized character string, matching each other.

Abstract: Disclosed is a database management method which generates an execution plan with respect to a factorized character string generated by factoring an execution value list of a query and stores the factorized character string and an execution plan identifier with respect to the factorized character string, matching each other.