Abstract: Disclosed is an apparatus that comprises a photo-acoustic transceiver which outputs, through a laser generator, a laser pulse output toward an object to be examined, and receives, through an ultrasonic wave receiver, an ultrasonic wave image signal from the object to be examined; an analog-to-digital converter which receives the ultrasonic wave image signal and converts same into a digital image signal; a main control unit which receives the digital image signal to generate ultrasonic wave scanning three-dimensional image information about the object to be examined; and a trigger control unit which receives motion information of a photo-acoustic probe to generate a scanning trigger signal corresponding to the motion information, receives laser pulse output information to generate a laser trigger signal corresponding to the laser pulse output, and generates an output trigger signal corresponding to the laser trigger signal and outputs same to the analog-to-digital converter.

Abstract: Disclosed is a method for manufacturing a lightweight brake disc with maximized heat dissipation ability. The method includes a first step of mixing gray cast iron and Fe—Cr ferroalloy with each other to produce a mixture, melting and solidifying the mixture to cast an alloy; a second step of heat-treating the alloy cast in the first step to pearlitize a microstructure of the alloy; and a third step of performing nitriding heat treatment of the alloy heat-treated in the second step.

Abstract: An encapsulant for encapsulating perovskite to prevent lead leakage therefrom, a method for encapsulating perovskite to prevent lead leakage therefrom, and a perovskite photoactive device including the encapsulant are disclosed. The encapsulant for encapsulating perovskite may contain a crown ether-based compound having a benzene ring substituted with an alkyl group. The perovskite encapsulating method may include coating, on a perovskite layer, a solution in which a crown ether-based compound having a benzene ring substituted with an alkyl group is dissolved in an organic solvent. The perovskite photoactive device includes an encapsulant encapsulating the perovskite layer to prevent the lead leakage therefrom.

Abstract: An earphone with an ANC automatic blocking function includes: a danger occurrence notification sound information registration unit registering and storing unique sound information of a danger occurrence notification sound certified by a public institution; an external sound recognition unit recognizing an external sound during operation of an ANC function; a sound information comparison analysis unit comparing sound information recognized by the external sound recognition unit with sound information registered in the danger occurrence notification sound information registration unit and analyzing and determining whether matching sound information exists; and an ANC function maintaining and blocking controller blocking the ANC function immediately when it is determined from an analysis result of the sound information comparison analysis unit that there exists sound information matching the sound information recognized by the external sound recognition unit.

Abstract: The present invention relates to a method for manufacturing a heterogeneous composite material thin plate, and a heterogeneous composite material thin plate manufactured thereby, the method comprising the steps of: (a) manufacturing a composite powder by ball milling an aluminum or aluminum alloy powder and a carbon nanotube powder; (b) manufacturing a multilayer billet comprising the composite powder, and comprising a core layer and two or more shell layers that encompass the core layer, the core layer being formed of the composite powder or an aluminum alloy, the shell layers excluding the outermost shell layer and being formed of the composite powder, and the outermost shell layer being formed of (i) an aluminum or aluminum alloy powder or (ii) the composite powder; (c) manufacturing an extruded material by extruding the multilayer billet; and (d) rolling the extruded material to mold same into a thin plate shape.

Abstract: There are provided a system and a method for vehicle-to-vehicle radio communication using an ultraviolet C band which enable vehicle-to-vehicle (V2V) communication by a wireless communication scheme using an ultraviolet C band (200 to 280 nm) to enhance safety of a vehicle operation. The system includes: a transmitter performing optical modulation for signal transmission when binary data for transmission is input, being driven to transmit the modulated optical signal, and transmitting a signal for vehicle-to-vehicle radio communication using an ultraviolet C band; and a receiver filtering an optical signal received through a UV lens, converting the filtered optical signal into a photon signal, and demodulating and recovering the photon signal.

Abstract: Disclosed are an object damage inspection system and an object damage inspection method using the same. The system includes a vibration exciter for setting a vibration exciting pattern and applying a physical force to one face of the fixed test object based on the set vibration exciting pattern; a sensor contacting a portion of the test object, wherein the sensor collects a vibration signal generated from the test object when the physical force is applied thereto; and a damage determiner configured to determine whether the test object has physical damage, based on a test object measurement frequency signal and a reference object measurement frequency signal, wherein the test object measurement frequency signal includes a frequency domain signal into which the vibration signal collected by the sensor is converted.

Abstract: The present invention relates to a conjugated polymer compound for a polymer solar cell donor and a polymer solar cell comprising same, wherein the conjugated polymer compound has a D-A form in which an electron-donating unit (benzodithiophene, BDT) and an electron-withdrawing unit (quinoxline, Qx) are combined, where a cyano (CN) substituent instead of fluorine (F) is introduced into the Qx unit to improve charge generation, charge transfer, and charge recombination characteristics of the polymer solar cell regardless of the type of acceptor contained in a photo-active layer, so that a polymer solar cell with greatly improved photo-conversion efficiency (PCE) can be implemented.

Abstract: There are provided a porous membrane including a perfluoroalkoxy alkane (PFA)-based melt-extruded film and having pores controlled by biaxial stretching, and a manufacturing method therefore. The porous membrane is for water treatment and includes a fluoropolymer. The method includes forming a film by melt-extruding a fluoropolymer; and controlling the pore size of the formed film by biaxial stretching. The membrane for water treatment is based on a fluoropolymer and has physical properties that are resistant to high temperatures and strong acids, and it is able to be used for treatment of wastewater such as semiconductor wastewater.

Abstract: The present invention relates to a method for manufacturing a heterogeneous composite material thin plate and a heterogeneous composite material thin plate manufactured by same, the method comprising the steps of: (a) ball-milling an aluminum or aluminum alloy powder and a carbon nanotube powder so as to prepare a composite powder; (b) preparing a multi-layered billet comprising the composite powder, the multi-layered billet characterized by comprising a core layer and two or more shell layers surrounding the core layer, wherein the core layer is made of the composite powder or an aluminum alloy, the shell layers excluding the outermost shell layer are made of the composite powder, and the outermost shell layer is made of (i) an aluminum or aluminum alloy powder or (ii) the composite powder; and (c) rolling the multi-layered billet so as to form a thin plate shape.

Abstract: The present invention provides a composition for inhibiting ice recrystallization, including: A nucleic acid structure comprising a scaffold nucleic acid folded at predetermined positions to form a plurality of strands, and a plurality of staple nucleic acids, wherein at least a portion thereof has a complementary sequence to at least a portion of the scaffold nucleic acid, thereby binding to the scaffold nucleic acid to form a double strand. Therefore, it is possible to increase a survival rate of cells due to having excellent effect of inhibiting ice recrystallization upon cryopreservation of the cells, and maintain a texture of food even when using the composition in the freezing of food.

Abstract: Disclosed are a solenoid actuator and a multi-stage solenoid actuator for transmitting a constant force. The solenoid actuator includes a tubular solenoid, a power unit capable of applying current to the solenoid, and a magnetic pair member having two magnetic members providing magnetic fields formed such that respective first poles thereof face each other and respective second poles thereof different from the first poles are located at both distal ends, and extending through the tub of the solenoid.

Abstract: A method for analyzing change in a mode of a unidirectional composite material includes applying a physical force of a predetermined pattern onto a unidirectional composite material specimen; sensing a vibration signal generated by the physical force at at least one sensed position thereof; performing modal analysis of a frequency response at a corresponding measurement location, based on the physical force applied to the specimen and the vibration signal measured at the sensed position of the specimen, and calculating at least one mode shape vector of the specimen based on the modal analysis result; compensating the calculated mode shape vector based on a distance between a normal line passing through a center of the specimen and the sensed position, thereby calculating a modified mode shape vector; and calculating a first modal assurance criterion (MAC) of the specimen based on the modified mode shape vector.

Abstract: Disclosed are an ultrasonic medium supplying jig and a fast ultrasonic scanning apparatus with a circulating medium, in which the medium is continuously supplied to between an ultrasonic probe and a to-be-scanned object to prevent the to-be-scanned object from being submerged in water, thereby enabling a stable ultrasound image to be obtained while achieving fast scanning.

Abstract: A method for analyzing dynamic mode change of an anisotropic material includes performing modal analysis of a first physical force applied to an isotropic material specimen and a first vibration signal collected from the isotropic material specimen, acquiring a first modal parameter of the isotropic material specimen, based on the modal analysis result, performing modal analysis of a second physical force applied to the anisotropic material specimen and a second vibration signal collected from the anisotropic material specimen, acquiring a second modal parameter of the anisotropic material specimen, based on the modal analysis result, acquiring a modal assurance criterion (MAC) for each mode of the anisotropic material specimen, based on the first and second modal parameters, and acquiring each similar mode of the anisotropic material specimen to each mode of the isotropic material specimen.

Abstract: The present disclosure relates to a recombinant gas vesicle nanoparticle, and the recombinant gas vesicle nanoparticle prepared by the method of the present disclosure is a nano-sized protein particle that it is biologically non-toxic and safe. Further, its outer surface protein, GvpC, can be recombined to include the exogenous protein to reconstitute gas vesicle nanoparticles presenting/mounting the exogenous protein on the surface, so that it can be used as various antigen-loaded vaccine compositions that are active under physiological conditions, therapeutic target-specific carriers, including a sensor for target-specific therapy.

Abstract: Disclosed is a beamforming method using a deep neural network. The deep neural network may include an input layer, L hidden layers, and an output layer, and the beamforming method may include: obtaining channel information h between a base station and K terminals and a transmit power limit value P of the base station, and inputting h and P into the input layer; and performing beamforming on signals to be transmitted to the K terminals using beamforming vectors derived using the output layer and at least one activation function, wherein the base station transmits the signals to the K terminals using M transmit antennas. Here, the output layer may be configured in a direct beamforming learning (DBL) scheme, a feature learning (FL) scheme, or a simplified feature learning (SFL) scheme.

Abstract: An apparatus for generating arc image-based welding quality inspection model is disclosed. The apparatus includes: a hall sensor for measuring a welding current flowing in a base metal through an arc welding machine; a voltage meter for measuring a welding voltage through a circuit generated between the arc welding machine and the base metal; a camera for capturing an image of a welding target area on which the arc welding machine performs welding; and a model generator configured to: identify a welding state based on the welding current measured using the hall sensor and the welding voltage measured using the voltage meter; obtain an arc image based on the image captured; associate the obtained arc image with a welding quality identified based on the arc image to generate a dataset; and apply the generated dataset to a deep-learning model to generate an arc image-based welding quality inspection model.

Abstract: There is provided a simultaneous localization and mapping (SLAM) system including a first LiDAR and a second LiDAR mounted on a vehicle bumper; a LiDAR data merge unit receiving data from the first LiDAR and the second LiDAR, aligning LiDAR times through time synchronization, and then converting the data into a point cloud type and merging the data; an electronic control unit (ECU) providing inertial data of the vehicle for correcting the data merged in the LiDAR data merge unit; and an SLAM unit correcting the data merged in the LiDAR data merge unit by using the inertial data of the vehicle received from the ECU to obtain LiDAR odometry for estimating a movement of the vehicle, generating a 3D map of a road on which the vehicle travels, and extracting a location and a traveling route of the vehicle inside a road.

Abstract: There is provided a message chain-based CAN security system with a hash function, including: a hash value generating unit generating a hash value H(r,ID,i)/H?(r,ID,i) using a received Hash Reset Key HRKr and ID to be transmitted or received by the system when an arbitrary node transmits the HRKr; a CAN message transmitting unit transmitting a CAN message including the hash value H(r,ID,i)/H?(r,ID,i); a validity determining unit determining whether H(r,ID,i) of a CAN message received by a node which has received the CAN message matches a value held by the system; a message receiving and executing unit allowing message reception and executing a command when the validity determining unit determines that the CAN message is valid; and a warning transmitting unit transmitting an intruder detection warning.