Abstract: The present invention relates to an ultra-thin acoustic lens for subwavelength focusing in a megasonic range and a design method thereof. More particularly, the present invention relates to a super-oscillatory planar ultra-thin acoustic lens for subwavelength focusing in the megasonic range, which includes a plurality of concentric regions arranged in a concentric shape with reference to the center point, wherein the concentric regions include a plurality acoustic insulation region for insulating incident acoustic waves, and a plurality of transmission regions for transmitting acoustic waves, the acoustic insulation regions and the transmission regions being formed alternatively in a radial direction from the center point so as to focus incident acoustic wave energy onto a subwavelength region.

Abstract: The present invention relates to an ultra-thin acoustic lens for subwavelength focusing in a megasonic range and a design method thereof. More particularly, the present invention relates to a super-oscillatory planar ultra-thin acoustic lens for subwavelength focusing in the megasonic range, which includes a plurality of concentric regions arranged in a concentric shape with reference to the center point, wherein the concentric regions include a plurality acoustic insulation region for insulating incident acoustic waves, and a plurality of transmission regions for transmitting acoustic waves, the acoustic insulation regions and the transmission regions being formed alternatively in a radial direction from the center point so as to focus incident acoustic wave energy onto a subwavelength region.

Abstract: A medical phantom is an object that models at least a part of the human body by using unit blocks, wherein the unit blocks include: a first unit block having a hexahedral shape of which the inside is empty; and a second unit block. The second unit block has a shape, of which the inside is empty, different from the hexahedral shape The second unit block also has ridges formed at the upper end thereof for stud-and-tube coupling, and has furrows formed at the lower end thereof and enabled to be coupled to the ridges.

Abstract: One embodiment of the present invention relates to a medical phantom which is an object that models at least a part of the human body by using a plurality of unit blocks, wherein the plurality of unit blocks include: a first unit block having a hexahedral shape of which the inside is empty; and a second unit block having a shape, of which the inside is empty, different from the hexahedral shape, having a plurality of ridges formed at the upper end thereof for stud-and-tube coupling, and having a plurality of furrows formed at the lower end thereof and enabled to be coupled to the plurality of ridges. The medical phantom is determined according to a combination form of the first unit block and the second unit block, at least one hole is formed on the lateral surfaces of the first unit block and the second unit block and a medium can be injected through the at least one hole.

Abstract: The present disclosure relates to a temperature controllable anechoic sound absorber using two different kinds of scattering particles and a method for manufacturing the same. More specifically, a temperature rise controllable anechoic sound absorber using two different kinds of scattering particles, which absorbs a sound wave which is transmitted through a medium, includes a composite material which induces a scattering process of the sound wave and has a first scattering particle and a second scattering particle; and a base material which fills a base of the absorber during the scattering process of the sound wave. Herein, volume content ratios of the base material, the first scattering particle, and the second scattering particles are adjusted so that a heat capacity of the absorber is within a set heat capacity range.

Abstract: A phantom for measuring thickness of a thin layer and a method of using thereof. The phantom may include a non-scattering muscle mimicking material having a flat top surface; a plurality of soft tissue mimicking thin layers placed in a first area, which is at least a part of a top surface of the non-scattering muscle mimicking material, and having thicknesses different from each other; and an anechoic blood mimicking liquid material placed in an area other than the first area among an entire area of the top surface of the non-scattering muscle mimicking material and on a top surface of the plurality of soft tissue mimicking thin layers.

Abstract: A phantom for measuring thickness of a thin layer and a method of using thereof. The phantom may include a non-scattering muscle mimicking material having a flat top surface; a plurality of soft tissue mimicking thin layers placed in a first area, which is at least a part of a top surface of the non-scattering muscle mimicking material, and having thicknesses different from each other; and an anechoic blood mimicking liquid material placed in an area other than the first area among an entire area of the top surface of the non-scattering muscle mimicking material and on a top surface of the plurality of soft tissue mimicking thin layers.

Abstract: A camera tracing and surveillance system and method for security using a thermal image coordinate, whereby an image having high resolution for identification in which a person can be accurately identified within a surveillance area and identity of the person can be accurately checked, can be obtained using a simple algorithm. To this end, the person within the surveillance area is identified and a position coordinate of the person is extracted from a thermal image captured by a thermal image camera, and a tracing and surveillance camera traces the person, enlarges an image of the person, and captures the enlarged image based on the extracted position coordinate so that an image having high resolution for identification can be obtained.

Abstract: A magnetostrictive phased array transducer for transducing shear horizontal bulkwaves including a plurality of magnetostrictive members each having a bottom surface of a plate-shaped structure made of a ferromagnetic material, which is mounted to be adhered closely to the surface of a mounting place; an insulator disposed on a side surface of each magnetostrictive member; a meander coil having a plurality of coil lines extended in the direction parallel with the bottom surface on each insulator, wherein adjacent coil lines are connected so that current flows in the opposite directions to each other, thereby generating a dynamic magnetic field with respect to each magneto strictive member; and a magnet mounted to generate a static magnetic field perpendicular to the dynamic magnetic field. When the current is supplied to the meander coil, a plurality of magnetostrictive members generate a plurality of shear horizontal bulkwaves while being deformed by the magnetostriction effect.

Abstract: A camera tracing and surveillance system and method for security using a thermal image coordinate, whereby an image having high resolution for identification in which a person can be accurately identified within a surveillance area and identity of the person can be accurately checked, can be obtained using a simple algorithm. To this end, the person within the surveillance area is identified and a position coordinate of the person is extracted from a thermal image captured by a thermal image camera, and a tracing and surveillance camera traces the person, enlarges an image of the person, and captures the enlarged image based on the extracted position coordinate so that an image having high resolution for identification can be obtained.

Abstract: Magnetostrictive transducers for monitoring wall thinning in a pipe, and an apparatus and method for monitoring wall thinning in a pipe using magnetostrictive transducers are provided. The magnetostrictive transducers generate broadband multimode shear horizontal (SH) waves, and allow the generated SH waves to travel along the pipe, thus correctly monitoring a status of the wall thinning of the pipe. The apparatus includes a transmitting transducer which is installed outside of a pipe and generates shear horizontal (SH) waves traveling along the pipe, a receiving transducer which is spaced apart from the transmitting transducer and measures the shear horizontal (SH) waves traveling along the pipe, and a controller for monitoring wall thinning of the pipe by exciting and measuring output signals of the transmitting and receiving transducers.

Abstract: Magnetostrictive transducers for monitoring wall thinning in a pipe, and an apparatus and method for monitoring wall thinning in a pipe using magnetostrictive transducers are provided. The magnetostrictive transducers generate broadband multimode shear horizontal (SH) waves, and allow the generated SH waves to travel along the pipe, thus correctly monitoring a status of the wall thinning of the pipe. The apparatus includes a transmitting transducer which is installed outside of a pipe and generates shear horizontal (SH) waves traveling along the pipe, a receiving transducer which is spaced apart from the transmitting transducer and measures the shear horizontal (SH) waves traveling along the pipe, and a controller for monitoring wall thinning of the pipe by exciting and measuring output signals of the transmitting and receiving transducers.

Abstract: A sensor for detecting surface defects of a metal tube solves a problem of a conventional eddy current probe in that it is difficult to detect a crack in the circumferential direction of a metal tube. The sensor includes a plurality of coils wound at a predetermined inclined angle. The plurality of coils is inserted into the inside of a metal tube. Alternating current is applied to the coils to measure a change in impedance of the coils due to a change in an eddy current generated in the metal tube, thus detecting a surface defect of the metal tube.

Abstract: Disclosed herein is a sensor for detecting surface defects of a metal tube, which can solve a problem of a conventional eddy current probe in that it is difficult to detect a crack in the circumferential direction of a metal tube. For this purpose, the present provides a sensor for detecting surface defects of a metal tube, the sensor including a plurality of coils wound at a predetermined inclined angle, wherein the plurality of coils is inserted into the inside of a metal tube and an alternating current is applied to the coils to measure a change in impedance of the coils due to a change in an eddy current generated in the metal tube, thus detecting a surface defect of the metal tube.