Abstract: A method and apparatus for selecting a beam direction is for use in a beamforming system. The beam direction selection method of a reception device having a plurality of antenna elements in a wireless communication system using beamforming according to the present disclosure includes acquiring a first reception beam angle estimated as optimal by allocating a first predetermined number of antenna elements to each of beam ports and scanning signals and acquiring a second reception beam angle estimated as optimal by allocating a second predetermined number of antenna elements, which is greater than the first predetermined number, to some of the beam ports and scanning the signals using the first reception beam angle. The beam selection apparatus and method of the present disclosure is capable of selecting a reception beam direction efficiently in a beamforming system.

Abstract: The present invention relates to a direction-controllable drug injection catheter. According to the present invention, provided is the catheter extending along a central axis “A” including a drug injection part in which a drug injection channel has been formed; a channel opening and closing means which opens and closes the drug injection channel; and a steering structure which is rotationally asymmetric with respect to the central axis “A” and varies according to a pressure change of the drug injection channel for the purpose of steering.

Abstract: Disclosed is a system for simultaneously measuring a surface normal vector and a surface reflection function in microscale. The system includes a light dome having a hemispherical-shaped structure and including LEDs to radiate light to an object placed therein; a macro lens installed camera arranged over the light dome to photograph the object through a hole formed at a center of the light dome under an environment in which a light is radiated from the light dome; an xyz micro-translation stage arranged under the light dome and configured to move in xyz-directions to adjust a focal distance between the macro lens installed camera and the object, and a measurement unit configured to control the light dome and the macro lens installed camera to obtain a microscale image, and configured to simultaneously measure a surface normal vector and a surface reflection function of the object based on the microscale image.

Abstract: A method for coating a thin film in a rolling manner and a thin film coating apparatus are provided. The method includes: floating a thin film material on a liquefied material; rolling a cylindrical substrate after contacting the cylindrical substrate with the thin film material; and coating the thin film material on a surface of the cylindrical substrate by using an attraction force between the surface of the cylindrical substrate and the thin film material.

Abstract: A mutant capable of producing 1,4-butanediol and a method of preparing 1,4-butanediol using the same are provided. The mutant microorganism is prepared by introducing and amplifying genes encoding enzymes converting succinate into 4-hydroxybutyrate and 4-hydroxybutyrate into 1,4-butanediol in a microorganism capable of producing succinate. The method includes culturing the mutant in a medium containing carbohydrate and obtaining 1,4-butanediol from the culture. Thus, 1,4-butanediol, which is essential in chemical industry, can be prepared in a biological process.

Abstract: A high-frequency signal predistortion device includes a high-frequency signal estimator, a predistortion estimator, and a predistorter. The high-frequency signal estimator is configured to determine non-linear distortion characteristics of high-frequency signals transmitted by antennas. The predistortion estimator is coupled to the high-frequency signal estimator. The predistortion estimator is configured to determine a predistortion coefficient based on the non-linear distortion characteristics. The predistorter is coupled to the predistortion estimator. The predistorter is configured to distort a base signal of the high-frequency signals based on the predistortion coefficient.

Abstract: A power management device according to example embodiments includes a self-startup circuit including an oscillator and a voltage multiplier to generate a start-up voltage in a first start-up period based on an input voltage, a boost converter to alternately charge the start-up voltage and an output voltage within a start-up voltage range during a second start-up period and to charge only the output voltage during an operation period, a controller to control the self-startup circuit and the boost converter based on a magnitude of the start-up voltage, a voltage charger including a start-up voltage capacitor and an output voltage capacitor, and a shared inductor connected between the input node and a common input node. The shared inductor operates as a part of the oscillator during the first start-up period and a part of the boost converter during the second start-up and operation periods.

Abstract: Disclosed is a method and system for re-directing a dynamic instance hosting service of a virtual object. The dynamic instance hosting service re-directing system may include a spatial information controller configured to determine whether an instance of an Internet of Things (IoT) device is movable based on spatial information of the IoT device using an instance hosting function; and an instance resource controller configured to manage available instance resources associated with the IoT device and an external service for an instance movement of the IoT device.

Abstract: A method and apparatus for robust localization in outdoor environments is provided. The localization method includes the steps of receiving scanner data from localization means and receiving angle information of a mobile device from an angle sensor, correcting the scanner data based on the received angle information, performing an Iterative Closest Point (ICP) mechanism for the corrected scanner data and generating a first constraint, and localizing the mobile device based on a graph structure under the first constraint.

Abstract: A coordinated transmission method based on beam division multiple access and an apparatus performing the same are disclosed. The coordinated transmission method in a beam division multiple access environment, which divides a service target region into a plurality of beam sectors through a plurality of antenna arrays having at least one of a pattern characteristic and a polarization characteristic, includes receiving a coordination request from a user terminal located in the service target region and performing any one among a macro diversity operation, a coordinated silence operation, and a coordinated beamforming operation for the user terminal based on an interference level included in the coordination request.

Abstract: Disclosed are a three-phase wireless power transfer (WPT) system and three-phase wireless rechargeable unmanned aerial vehicle (UAV) system based on the same. Three power receiving coils, including resonators, are installed at the ends of three landing leg of the UAV. A three-phase power converter installed in the UAV receives the three-phase AC induction current induced in three power receiving coils, including resonators, converting the three-phase AC induction current into a DC current to be charged in a battery. A three-phase power wireless charging apparatus wirelessly transfers three-phase power from three power transmitting coils to the three power receiving coils of the UAV when the three landing legs land on three coil seating units provided on a charging platform. A magnetic flux leakage shielding coil may be provided to prevent magnetic flux leakage from approaching the UAV. The power transfer efficiency is excellent, and electromagnetic interference can be also reduced.

Abstract: A method of fabricating a metal nanowire dispersion solution includes heating a first solution including a metal compound, a catalyst, an organic protection agent and menstruum, thereby forming metal nanowires in the first solution, performing a first cleaning process providing a first solvent into the metal nanowire, thereby separating the organic protection agent surrounding the metal nanowires from the metal nanowires, separating the metal nanowires from the first solution by vacuum-filtering, and dispersing the separated metal nanowires in a dispersion solvent.

Abstract: Provided is a method and apparatus for operating an idle mode in a wireless communication system. The method includes receiving a first message requesting entry to an idle mode from a Subscriber Station (SS) through at least one Base Station (BS), selecting in response to reception of the first message whether the MS is to enter an idle mode in which BSs belonging to a paging group broadcast a paging message for the MS or whether the MS is to enter a semi-idle mode in which BSs belonging to a semi-idle paging group, which is a subset of the paging group, broadcast the paging message for the SS, and transmitting Paging announce information instructing the BSs belonging to the semi-idle paging group to broadcast the paging message for the SS, if the semi-idle mode is selected.

Abstract: A manufacturing method of a triboelectric energy harvester, including the steps of generating an electrification material with a surface of a micro-nano pattern on an electrode and forming a coating electrification layer to support the micro-nano pattern on a surface of the electrification material, is provided.

Abstract: An organometallic complex represented by Formula 1-1 or Formula 1-2 is provided: wherein in Formulae 1-1 and 1-2, descriptions of R1 to R7, X1, X2, Y1 to Y4, rings A, B, C, and a to e are understood by referring to the description provided herein. An organic light-emitting device includes a first electrode, a second electrode facing the first electrode, and an organic layer that is disposed between the first electrode and the second electrode and includes an emission layer, wherein the organic layer includes at least one organometallic complex represented by Formula 1-1 or Formula 1-2.

Abstract: A method for transmitting downlink data in a multicast scheme by a base station in a wireless communication system is disclosed. The method includes receiving a first request signal requesting first data from a first user equipment (UE), receiving a second request signal requesting second data from a second UE, generating a transmission message by applying an exclusive OR (XOR) operation to the first data and the second data, and transmitting the transmission message to the first UE and the second UE in the multicast scheme.

Abstract: Provided are a novel UDP-glycosyltransferase (uridine diphosphate glycosyltransferase) protein having glycosyltransfer activity for glucose linked by a glycosidic bond at the C-20 position of PPD (protopanaxadiol)-type or PPT (protopanaxatriol)-type ginsenoside, and use thereof.

Abstract: An unmanned aerial vehicle includes a body portion, a plurality of driving portions, a plurality of arms and first and second landing members. The body portion is formed at a center thereof, and the body portion includes an inner space defined by an upper plate, a lower plate and a plurality of supporting frames that connect the upper plate with the lower plate. The plurality of driving portions generate an impellent force for a flight. Each of the plurality of arms has one end connected to the body portion and the other end connected to one of the driving portions.

Abstract: Disclosed is a method of reconstructing an image. The method of reconstructing an image includes receiving low dose X-ray computed tomography (CT) data, applying an analytic principle to an optimization approach for low dose imaging to transform the low dose X-ray CT data, and removing a noise included in the low dose X-ray CT data to reconstruct a high-quality image.

Abstract: Provided is a joint pattern beam sectorization method and apparatuses for performing the same, wherein the joint pattern beam sectorization method including generating, in a service target region, a pattern sector corresponding to an antenna array including antennas having an identical radiation pattern by using the antenna array and generating pattern beam sectors in the pattern sector through a beamforming using the antennas.