Abstract: A holographic-based directional sound device is provided, the device including: a sound wave generating means generating a sound wave; and a flat plate configured to have the sound wave generating means installed at the center so as to radiate the sound wave to the outside through a surface, and to be composed of a plurality of unit cells, in which at least one groove is formed on a surface of the unit cell, and a radiation angle of the sound wave is determined according to a depth of the groove with respect to the unit cell, wherein the depth of the groove is determined by an individual surface admittance calculated by a cosine function or a sine function of the sum of a first value and a second value on the basis of a preset radiation angle of the sound wave and a preset frequency of the sound wave.

Abstract: The present invention relates to a metal-organic framework and an energy storage system having the same, and more specifically, to an energy storage system that is capable of providing excellent electrical conductivity and electrochemical capacity properties, especially excellent electrochemical performance at low temperatures, by means of a novel one-dimensional metal-organic framework having thianthrene-based organic ligands.

Abstract: A sound insulation plate includes a patterned frame and an elastic membrane, wherein the patterned frame includes a central pattern region and multiple peripheral pattern regions arranged around the central pattern region, the multiple peripheral pattern regions being separated from the central pattern region by a separation bar, and wherein the elastic membrane is mounted on the patterned frame to block passage of air and converts airborne sound waves into elastic waves.

Abstract: The present invention relates to a device for converting a frequency of an electromagnetic wave and, more specifically, to a device for converting an original frequency of an electromagnetic wave into a frequency corresponding to a resonator mode by using a time-varying Fabry-Perot resonator including a time-varying reflective surface of which reflectivity changes with time.

Abstract: Proposed are a stretchable display panel device capable of effectively correcting an image according to a strain ratio and a method of correcting the image. The stretchable display panel device includes a stretchable display panel, a measurement unit, and a correction unit. The measurement unit measures the strain ratio of the stretchable display panel. The correction unit corrects the image on the stretchable display panel on the basis of the strain ratio. The expandable and contractible display panel overall has a uniform strain ratio and has a negative effective Poisson’s ratio. The strain ratio is a strain ratio in a first direction.

Abstract: Provided are a graphene preparation apparatus, including: a chamber having a space for preparation of graphene; a first electrode and a second electrode disposed in the chamber to be separated a predetermined distance from each other, the first electrode and the second electrode supporting a catalytic metal and receiving electric current for preparation of the graphene to heat the catalytic metal using Joule heating; additional heaters disposed at opposite sides of the catalytic metal, respectively, and heating the catalytic metal to compensate for a temperature difference between both end regions and a central region of the catalytic metal heated using Joule heating induced by the first electrode and the second electrode; and a current supply unit supplying electric current to the first electrode and the second electrode.

Abstract: The present invention relates to a metal-organic framework and an energy storage system having the same, and more specifically, to an energy storage system that is capable of providing excellent electrical conductivity and electrochemical capacity properties, especially excellent electrochemical performance at low temperatures, by means of a novel one-dimensional metal-organic framework having thianthrene-based organic ligands.

Abstract: A graphene manufacturing device using Joule heating includes: a chamber having a space provided therein so as to synthesize graphene; and a first roller portion and a second roller portion disposed inside the chamber to be spaced from each other such that same support a catalyst metal penetrating the interior of the chamber and are supplied with an electric current for graphene synthesis, thereby Joule-heating the catalyst metal. In order to compensate for a temperature deviation of the catalyst metal passing between the first roller portion and the second roller portion, a first area of the catalyst metal, which is close to the first roller portion, and a second area of the catalyst metal, which is close to the second roller portion, are disposed to have movement paths facing each other.

Abstract: Disclosed herein is a meta-muffler for reducing broadband noise. The meta-muffler includes: a flow pipe through which a fluid flows; an outer barrel disposed outside the flow pipe to be spaced apart from the flow pipe; and multiple metastructures arranged in a flow direction of the fluid and each comprising an opening opened parallel to the flow direction of the fluid, a resonance chamber disposed between the flow pipe and the outer barrel and communicating with the flow pipe through the opening, and a neck adjustment member extending from the outer barrel toward the flow pipe to be spaced apart from the opening in the flow direction of the fluid. The meta-muffler can increase transmission loss of noise flowing through the flow pipe through maximization of energy loss of sound waves entering the resonance chamber of the metastructure and can effectively attenuate noise over a wide band ranging from low frequencies to high frequencies.

Abstract: An apparatus for repairing elements, includes: a bonding material transfer stamp transferring a new bonding material to a repair area on a substrate, the repair area having a defective element or a residual bonding material removed therefrom; and an element transfer stamp transferring a new element to the new bonding material, wherein the element transfer stamp comprises a load control portion for elements, the load control portion being bent and deformed upon receiving pressing force such that a zero-stiffness load smaller than a critical damage load of the new element is applied to the new element.

Abstract: Disclosed herein are a metastructure having a zero elastic modulus zone, which can experience constant stress in a predetermined strain zone, and a method for designing the same. The metastructure includes a first unit and a second unit, wherein the first unit has a structure capable of buckling and has a stress-strain relation having a zone corresponding to a negative elastic modulus, the second unit is disposed adjacent to the first unit and has a stress-strain relation having a zone corresponding to a positive elastic modulus, and the metastructure has zero elastic modulus in a predetermined target strain zone through synthesis of the negative elastic modulus of the first unit with the positive elastic modulus of the second unit.

Abstract: A sound insulation plate includes a patterned frame and an elastic membrane, wherein the patterned frame includes a central pattern region and multiple peripheral pattern regions arranged around the central pattern region, the multiple peripheral pattern regions being separated from the central pattern region by a separation bar, and wherein the elastic membrane is mounted on the patterned frame to block passage of air and converts airborne sound waves into elastic waves.

Abstract: Disclosed herein are a non-rigid pad for device transfer, which allows uniform contact pressure to be applied between multiple devices and a target substrate to which the devices are to be transferred, a method of manufacturing the same, and a non-rigid pad group for device transfer including the same. The non-rigid pad includes: a base plate; and multiple pillars each protruding from one surface of the base plate with one end thereof connected to the one surface of the base plate, the pillars being bent and deformed upon application of external force, wherein the non-rigid pad is disposed between a transfer film to which multiple devices to be transferred to a target substrate are adhesively attached and a pressing unit providing pressing force to transfer the multiple devices to the target substrate, the non-rigid pad being bent and deformed upon application of pressing force by the pressing unit to allow uniform contact pressure to be applied between the multiple devices and the target substrate.

Abstract: The present disclosure relates to a two-dimensional Ni-organic framework/rGO composite including: a two-dimensional electroconductive Ni-organic framework in which Ni and an organic ligand containing a substituted or unsubstituted C6-C30 arylhexamine are repeatedly bonded in a branched form; and reduced graphene oxide (rGO). Thus, when a composite of reduced graphene oxide (rGO) and a two-dimensional Ni-MOF is prepared and used as an energy storage electrode material, the two-dimensional Ni-organic framework/rGO composite of the present disclosure can exhibit higher discharge capacity per weight due to the synergistic effect of rGO and Ni-MOF as compared to when Ni-MOF is used alone, and the composite can be used to manufacture a thin-film type electrode, which can be used as a next-generation energy storage electrode having high mechanical bending strength and energy density per volume.

Abstract: A holographic-based directional sound device is provided, the device including: a sound wave generating means generating a sound wave; and a flat plate configured to have the sound wave generating means installed at the center so as to radiate the sound wave to the outside through a surface, and to be composed of a plurality of unit cells, in which at least one groove is formed on a surface of the unit cell, and a radiation angle of the sound wave is determined according to a depth of the groove with respect to the unit cell, wherein the depth of the groove is determined by an individual surface admittance calculated by a cosine function or a sine function of the sum of a first value and a second value on the basis of a preset radiation angle of the sound wave and a preset frequency of the sound wave.

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: A transparent stealth structure includes: a first transparent film structure stacked on a front surface of a transparent base, the first transparent film structure causing energy loss of incident electromagnetic waves having a target frequency to change a phase of transmitted electromagnetic waves propagating toward the transparent base; and a second transparent film structure stacked on a back surface of a transparent base, the second transparent film structure reflecting the transmitted electromagnetic waves having passed through the transparent base while adjusting a phase of reflected waves propagating toward the first transparent film structure, wherein the first transparent film structure includes a first front transparent conductive pattern having a first sheet resistance and a second front transparent conductive pattern filling a region, and the second transparent film structure includes a first rear transparent conductive pattern having a third sheet resistance and a second rear transparent conductiv

Abstract: Provided is a graphene production method using Joule heating, including: a catalytic metal placement step in which a catalytic metal is disposed on a pair of electrodes disposed inside a chamber; a gas supply step in which a carbon-containing reaction gas and a carrier gas for transporting the reaction gas are supplied into the chamber; a heating step in which the catalytic metal is rapidly heated to a temperature required for synthesis of graphene; a temperature maintenance step in which the temperature of the catalytic metal is maintained to form the graphene on the catalytic metal; and a cooling step in which the catalytic metal is cooled to prevent local occurrence of hotspots on the graphene formed on the catalytic metal, wherein the heating step, the temperature maintenance step, and the cooling step constitute one cycle of temperature control and the cycle is repeated for a predetermined process time.

Abstract: The present invention relates to a carrier film for transferring a microelement, wherein, when a microelement is pressurized, a uniform pressurizing force is provided to the entire microelement, and a damage to the microelement can be prevented. The carrier film for transferring a microelement comprises: a load control layer having a first elastic modulus and having a space formed in a part of the interior thereof; and an adhesive layer having a second elastic modulus that is smaller than the first elastic modulus, the adhesive layer being provided on the upper portion of the load control layer and configured such that a microelement supposed to be transferred to a target substrate is attached thereto. The load control layer has a first zero-rigidity area that maintains a first stress in a first deformation range from a first strain to a second strain.

Abstract: An exemplary embodiment of the present invention provides an anisotropic medium for full transmission of obliquely incident elastic waves considering a longitudinal wave and a shear wave by using an anisotropic medium designed to fully transmit elastic waves in a desired mode when elastic waves are obliquely incident to a boundary of different media.