Abstract: A fluid silencer includes: an expansion pipe disposed on a pipe through which a fluid containing noise sources flows and having an accommodation space therein; a viscous fluid received in the accommodation space; a noise introducing member disposed between the pipe and the expansion pipe to seal the accommodation space and allowing the noise sources to be introduced into the accommodation space therethrough; at least one partition member disposed in the accommodation space and dividing the accommodation space in a flow direction of the fluid; multiple baffle members disposed on one surface of the partition member and forming multiple sound absorbing spaces into which the noise sources introduced into the accommodation space are dispersedly introduced; and an elastic member disposed between the partition member and the baffle members and contracted/expanded by the viscous fluid entering/leaving the sound absorbing spaces as the noise sources are introduced into the sound absorbing spaces.

Abstract: The provided is an ultra-wideband electromagnetic wave absorber having a hexagonal double layer structure, and in the ultra-wideband electromagnetic wave absorber, the first conductive pattern disposed on the top of the first dielectric layer and the second conductive pattern disposed on the top of the second dielectric layer are arranged in an up-down double layer structure, thereby expanding the electromagnetic wave absorption bandwidth, and even when applied to a corner or a curved structure forming 60° or 120° by hexagonal unit cells, the unit cells can be periodically arranged at the same interval. In addition, since dielectrics with a difference of less than 10% in dielectric constant in a vacuum state have a relatively low specific gravity, the overall weight can be made very light by using such dielectrics in the first dielectric layer and the second dielectric layer.

Abstract: According to the present invention, a drone control system includes: a flying drone; a cloud server configured to transmit and receive information to and from the drone by wireless communication; and a ground control system configured to establish a flight plan of the drone by connecting the drone and the cloud server by the wireless communication.

Abstract: A sound wave delivery structure of the present invention comprises unit structure cells each formed to have a cubic shape and comprising a column portion formed on a region corresponding to sides, and a space portion formed in an internal region surrounded by the column portion. There are a plurality of unit structure cells which are successively arranged in a first direction, in which sound waves are delivered, and a second direction crossing the first direction.

Abstract: A method of displaying a corridor for an unmanned vehicle using a point cloud. The method includes: displaying the space vector points in a preset 3-dimensional space; and generating and displaying individual corridors, each individual corridor connecting between selected space vector points from among the space vector points. Each of the space vector points includes location information and size information, the individual corridor is displayed by a stereoscopic structure including an internal space in which the unmanned vehicle can fly, and the form of the individual corridor is determined based on the size information of a pair of adjacent space vector points.

Abstract: A method of displaying a corridor for an unmanned vehicle using a point cloud. The method includes: displaying the space vector points in a preset 3-dimensional space; and generating and displaying individual corridors, each individual corridor connecting between selected space vector points from among the space vector points. Each of the space vector points includes location information and size information, the individual corridor is displayed by a stereoscopic structure including an internal space in which the unmanned vehicle can fly, and the form of the individual corridor is determined based on the size information of a pair of adjacent space vector points.

Abstract: Proposed is a 4-dimensional path display method for an unmanned vehicle using a point cloud that makes it easy to control the unmanned vehicle and provides a minute and safe path in response to collision accidents during flight of unmanned vehicles by using the point cloud in the 3-dimensional airspace space to define and display the corridor that constitutes the flight path of the unmanned vehicle in detail and easily. The 4-dimensional path display method for an unmanned vehicle using a point cloud according to an embodiment of the present invention includes the steps of defining a 3-dimensional airspace space for generating a flight path of the unmanned vehicle, and generating and displaying the flight path of the unmanned vehicle using the point cloud in the 3-dimensional airspace space.

Abstract: A fluid silencer includes: an expansion pipe disposed on a pipe through which a fluid containing noise sources flows and having an accommodation space therein; a viscous fluid received in the accommodation space; a noise introducing member disposed between the pipe and the expansion pipe to seal the accommodation space and allowing the noise sources to be introduced into the accommodation space therethrough; at least one partition member disposed in the accommodation space and dividing the accommodation space in a flow direction of the fluid; multiple baffle members disposed on one surface of the partition member and forming multiple sound absorbing spaces into which the noise sources introduced into the accommodation space are dispersedly introduced; and an elastic member disposed between the partition member and the baffle members and contracted/expanded by the viscous fluid entering/leaving the sound absorbing spaces as the noise sources are introduced into the sound absorbing spaces.

Abstract: According to the present invention, a drone control system includes: a flying drone; a cloud server configured to transmit and receive information to and from the drone by wireless communication; and a ground control system configured to establish a flight plan of the drone by connecting the drone and the cloud server by the wireless communication.