Abstract: A directional sound apparatus includes a planar shape plate and a sound wave generator. The planar shape plate has a plurality of grooves formed on a surface of the planar shape plate. The sound wave generator is configured to radiate a sound wave to outside from the surface of the planar shape plate. A width of each of the grooves and a distance between the grooves adjacent to each other are smaller than a wavelength of the sound wave. The planar shape plate has a plurality of cell areas in which at least one groove is included. A structure of the groove included in a first cell area is different from that of the groove included in a second cell area adjacent to the first cell area, so that surface admittance in the first cell area is different from that in the second cell area.

Abstract: In a droplet ejection apparatus and a droplet ejection method using the droplet ejection apparatus, the droplet ejection apparatus includes a liquid supply unit, a nozzle and a standing wave generating unit. The liquid supply unit is configured to provide a pressure to a liquid. The nozzle is connected to the liquid supply unit through a connecting conduit, to eject the liquid with a droplet. The standing wave generating unit is configured to generate a standing wave around the nozzle at which the droplet is formed, to detach the droplet from the nozzle.

Abstract: An embodiment of the present invention provides an ultrasonic wave amplifying unit which can improve ultrasonic power in air, wherein the ultrasonic wave amplifying unit includes multiple rings having a concentric axis and each having a first width, and a slit having a second width is formed between the rings and an air layer is formed between the multiple rings and an ultrasonic wave generator generating ultrasonic waves or a transfer medium transferring the ultrasonic waves.

Abstract: A method for designing a piezoelectric element unit, a ultrasonic element having the piezoelectric element manufactured using the method, a method for manufacturing the ultrasonic element, and an acoustic pressure focusing device having the ultrasonic element are provided. In the method for designing a piezoelectric element unit, a target position and a target distance are selected. A basic information of a piezoelectric element base material is inputted. Each of a plurality of grids is grouped into a unit grid group. A size of an output acoustic pressure outputted at each unit grid group is calculated. The unit grid group outputting the output acoustic pressure included in a range of a reference acoustic pressure among a plurality of the unit groups is decided. The plurality of ring patterns being concentric is determined based on a pattern shape information.

Abstract: An embodiment of the present invention provides an ultrasonic wave amplifying unit which can improve ultrasonic power in air, wherein the ultrasonic wave amplifying unit includes multiple rings having a concentric axis and each having a first width, and a slit having a second width is formed between the rings and an air layer is formed between the multiple rings and an ultrasonic wave generator generating ultrasonic waves or a transfer medium transferring the ultrasonic waves.

Abstract: A directional sound apparatus includes a planar shape plate and a sound wave generator. The planar shape plate has a plurality of grooves formed on a surface of the planar shape plate. The sound wave generator is configured to radiate a sound wave to outside from the surface of the planar shape plate. A width of each of the grooves and a distance between the grooves adjacent to each other are smaller than a wavelength of the sound wave. The planar shape plate has a plurality of cell areas in which at least one groove is included. A structure of the groove included in a first cell area is different from that of the groove included in a second cell area adjacent to the first cell area, so that surface admittance in the first cell area is different from that in the second cell area.

Abstract: In a module for detecting a fingerprint, an electronic device using the module and a method for manufacturing an acoustic control member for the module, the module includes a contact member, a transducer, an impedance matching member, an acoustic control member and a signal processor. A fingerprint makes contact with the contact member. The transducer outputs an ultrasonic signal to the contact member and receives the ultrasonic signal reflected from the contact member. The impedance matching member is charged between the contact member and the transducer, to transmit the ultrasonic signal between the contact member and the transducer. The acoustic control member is inserted between the contact member and the transducer. The impedance matching member is charged inside of the acoustic control member. The signal processor makes electric contact with the transducer, to sense the fingerprint based on the received ultrasonic signal.

Abstract: In a module for detecting a fingerprint, an electronic device using the module and a method for manufacturing an acoustic control member for the module, the module includes a contact member, a transducer, an impedance matching member, an acoustic control member and a signal processor. A fingerprint makes contact with the contact member. The transducer outputs an ultrasonic signal to the contact member and receives the ultrasonic signal reflected from the contact member. The impedance matching member is charged between the contact member and the transducer, to transmit the ultrasonic signal between the contact member and the transducer. The acoustic control member is inserted between the contact member and the transducer. The impedance matching member is charged inside of the acoustic control member. The signal processor makes electric contact with the transducer, to sense the fingerprint based on the received ultrasonic signal.

Abstract: A sound wave metamaterial amplifies a sound wave, and includes a plate. The plate has a plurality of sound wave guides passing through both surfaces of the plate and having a predetermined pattern. The sound wave guides are spaced apart from each other by a predetermined distance and face each other, with respect to a central point, a central axis or a central surface.

Abstract: The present invention relates to a cochlear implant apparatus, and more particularly, to a cochlear implant apparatus capable of controlling the sensitivity or selectivity of sound through actuators. In accordance with an exemplary embodiment of the present invention, a cochlear implant apparatus for active feedback control which is inserted into the human body and configured to detect a sound in each frequency band includes a sensor unit configured to detect vibration according to a sound and generate an electrical signal corresponding to a magnitude of the vibration and actuators disposed in the sensor unit and each configured to react to the electrical signal and to control sensitivity according to the magnitude of the sound or the selectivity of a sound detected in each frequency band.

Abstract: Disclosed herein are a microelectromechanical systems (MEMS) microphone with a dual-back plate, and a method of manufacturing the same. The MEMS microphone according to an exemplary embodiment of the present invention includes: a substrate having a first back plate formed at a central portion thereof; a membrane plate disposed on first support parts formed at both sides on the substrate and vibrated depending on external sound pressure; and a second back plate disposed on second support parts formed at both sides of the membrane plate.

Abstract: A sound wave metamaterial amplifies a sound wave, and includes a plate. The plate has a plurality of sound wave guides passing through both surfaces of the plate and having a predetermined pattern. The sound wave guides are spaced apart from each other by a predetermined distance and face each other, with respect to a central point, a central axis or a central surface.

Abstract: The present invention relates to a cochlear implant apparatus, and more particularly, to a cochlear implant apparatus capable of controlling the sensitivity or selectivity of sound through actuators. In accordance with an exemplary embodiment of the present invention, a cochlear implant apparatus for active feedback control which is inserted into the human body and configured to detect a sound in each frequency band includes a sensor unit configured to detect vibration according to a sound and generate an electrical signal corresponding to a magnitude of the vibration and actuators disposed in the sensor unit and each configured to react to the electrical signal and to control sensitivity according to the magnitude of the sound or the selectivity of a sound detected in each frequency band.

Abstract: Disclosed herein are a microelectromechanical systems (MEMS) microphone with a dual-back plate, and a method of manufacturing the same. The MEMS microphone according to an exemplary embodiment of the present invention includes: a substrate having a first back plate formed at a central portion thereof; a membrane plate disposed on first support parts formed at both sides on the substrate and vibrated depending on external sound pressure; and a second back plate disposed on second support parts formed at both sides of the membrane plate.

Abstract: Disclosed is a device for a cochlear implant with a sensor and an electrode to sense vibration of a sound and stimulate the auditory nerve, the device comprising a sensor unit inserted in a scala tympani of the cochlea, sensing vibration caused by a sound from the cochlea, converting the sensed vibration into an electrical signal, and transmitting the converted electrical signal to the outside of the cochlea.

Abstract: Disclosed is a frequency analyzer for a MEMS based cochlear implant with self power supply. The frequency analyzer for a MEMS based cochlear implant includes: an upper structure including a first substrate, and a nano wire contact portion formed under the first substrate and coated with a high conductivity metal; and a lower structure including a second substrate having a space filled with a fluid and an upper portion of which is opened, a membrane formed on the fluid filled in the space of the second substrate, a first electrode formed on the membrane, and a nano wire formed on the first electrode and having the piezoelectric characteristics related to an arbitrary direction in which the nano wire is grown.

Abstract: Disclosed herein is an apparatus for measuring adhesive and frictional properties of a polymer hemisphere relative to a contact plate provided in the apparatus. The apparatus comprise a body having a movable table installed to move along an X-axis and Y-axis and a vertical column positioned at a rear side of the movable table, a sample mount provided on the movable table and having a mirror to reflect surface images of a horizontal contact plate, a head assembly located at a front side of the column and having a polymer hemisphere used to press a surface of the contact plate to implement an adhesive force test, a camera device located at a front side of the mirror to capture the surface images of the contact plate during the adhesive force test, and a control device for analyzing various data inputted thereto during the adhesive force test.

Abstract: Disclosed is a frequency analyzer for a MEMS based cochlear implant with self power supply. The frequency analyzer for a MEMS based cochlear implant includes: an upper structure including a first substrate, and a nano wire contact portion formed under the first substrate and coated with a high conductivity metal; and a lower structure including a second substrate having a space filled with a fluid and an upper portion of which is opened, a membrane formed on the fluid filled in the space of the second substrate, a first electrode formed on the membrane, and a nano wire formed on the first electrode and having the piezoelectric characteristics related to an arbitrary direction in which the nano wire is grown.

Abstract: An atomic force microscope probe provides an indentation testing function in a direction along an axis. The probe has a tip and an arm structure holding the tip. The arm structure has one end mounted on a fixed stage, the other end coupled to the AFM tip, and a hollow frame having a shape symmetric with respect to a plane including an axis on which the two ends are positioned.

Abstract: An atomic force microscope probe provides an indentation testing function in a direction along an axis. The probe has a tip and an arm structure holding the tip. The arm structure has one end mounted on a fixed stage, the other end coupled to the AFM tip, and a hollow frame having a shape symmetric with respect to a plane including an axis on which the two ends are positioned.