Abstract: A vehicle foldable seat includes a seatback unit fixed to a vehicle body and coupled to a headrest and a seat cushion unit rotatably connected to the seatback unit. The seat cushion unit is fixed by elastic force in a stowing position, is selectively switched to a seating position when fixation thereof is released, and is engaged with the seatback unit to be fixed in the seating position.

Abstract: Provided is a composition for surface treatment of a steel sheet, the composition having excellent resistance to an acid, such as sulfuric acid, and to a coated steel sheet to which the composition for surface treatment is applied, wherein the composition for surface treatment comprises 30-50% wt % of colloidal silica containing 5-20 nm-sized silica, 40-60% wt % of silane containing three or more alkoxy groups, 5-15 wt % of an acrylate-based organic monomer, 0.01-1 wt % of an acid, and 1-15 wt % of a solvent.

Abstract: Disclosed is a method of preparing sodium-catalyzed iron-aluminum inorganic catalyst for catalyzing a hydrogenation reaction of carbon dioxide. The method of preparing sodium-catalyzed iron-aluminum inorganic catalyst includes: a first step of mixing a precipitant solution formed by dissolving a basic precipitant with a reaction solution formed by dissolving an iron (Fe) precursor material and an aluminum (Al) precursor material, thereby forming a suspension solution; a second step of aging the suspension solution; a third step of separating powder from the aged suspension solution; a fourth step of drying the separated powder and then performing a first heat treatment, thereby forming first catalyst powder; and a fifth step of adding and stirring the first catalyst powder and a sodium precursor material to water and evaporating the water and then performing a second heat treatment, thereby preparing a sodium-introduced iron-aluminum inorganic catalyst.

Abstract: According to various embodiments of the present invention, disclosed is an electronic device comprising: a housing that comprises a front surface, a back surface opposite the front surface, and side surfaces surrounding a space between the front surface and the back surface and made of a metal material; at least one antenna array disposed within the housing so as to radiate a millimeter wave signal toward the inside of the electronic device; a wireless communication circuit electrically connected to the at least one antenna array and configured to communicate by using the millimeter wave signal; and a reflecting member arranged such that the millimeter wave signal radiated from the at least one antenna array is reflected toward the outside of the electronic device. In addition, various embodiments known from the specification are possible.

Abstract: An electronic device includes a housing that includes a first plate, a second plate facing a direction opposite the first plate, and a side member surrounding a space between the first plate and the second plate, an antenna structure that includes a plurality of dielectric layers perpendicular to the side member and parallel to the first plate, a first array of conductive plates aligned in a first direction perpendicular to the first plate at a first dielectric layer of the dielectric layers, a second array of conductive plates spaced from the first array and aligned in the first direction at the first dielectric layer, wherein the second array is farther from the first plate than the first array, at least one ground plane positioned on at least one of the dielectric layers and interposed between the first array and the second array, when viewed from above the side member, and a wireless communication circuit electrically connected to the first array and the second array and configured to transmit and/or rece

Abstract: According to an embodiment, an electronic device comprises a housing comprising a first plate and a second plate facing away from to the first plate; and a substrate disposed between the first plate and the second plate and comprising a first side facing the first plate and a second side facing the second plate, wherein the substrate comprises, a first conductive plate disposed on a first insulating layers and facing the second side; a conductive pattern disposed on a second insulating layer, wherein the second conductive layer is between the first conductive layer and the first side; a second conductive plate disposed on a third insulating layer between the second insulating layer and the first side, and when the second plate is viewed from above the second side, the second plate at least partially overlaps with the first conductive plate; a ground plate disposed on a fourth insulating layer, wherein the fourth insulating layer is between the third insulating layer and the first side; a conductive via constr

Abstract: An electronic device includes a first conductive plate, a second conductive plate that is spaced from the first conductive plate and is disposed parallel to the first conductive plate, a conductive element that is disposed in a space between the first conductive plate and the second conductive plate, a wireless communication circuit that is electrically connected with the first conductive plate and the conductive element, and a printed circuit board that is coupled with at least one side of the first conductive plate, at least one side of the second conductive plate, and one end of the conductive element. The wireless communication circuit is configured to transmit/receive a first radio frequency (RF) signal having a vertical polarization characteristic using the first conductive plate and the second conductive plate and to transmit/receive a second RF signal having a horizontal polarization characteristic using the conductive element.

Abstract: Provided are a novel isoprene synthase derived from sweet potato and a method of preparing isoprene using the same, and more specifically, a novel isoprene synthase derived from sweet potato, a gene encoding the isoprene synthase, a host cell transformed with the gene, and a method of preparing isoprene using the same. The isoprene synthase of the present invention may have higher isoprene productivity as compared to isoprene synthases known in the related art to thereby be effectively used in isoprene biosynthesis and preparation of an isoprene polymer using the same.

Abstract: An electronic device is provided. The electronic device includes a housing including a first plate, a second plate facing the first plate and spaced from the first plate, and a side member surrounding a space between the first plate and the second plate, wherein the second plate includes a nonconductive material, at least one antenna element positioned within the space and positioned on a substrate parallel to the second plate, wherein the at least one antenna element is spaced from the second plate by a gap h, and a wireless communication circuit electrically connected to the antenna element and configured to transmit and/or receive a signal with a frequency between 20 GHz and 100 GHz and a wavelength corresponding to the frequency, wherein the gap h corresponds to n ? ? 2 , wherein n is an integer and ? is the wavelength.

Abstract: An antenna device is provided and includes a plurality of antenna radiators arranged in an array, a ground member in operable communication with the plurality of antenna radiators, a plurality of conductive cells arranged on the plurality of antenna radiators, and a plurality of feeding lines electrically connected to the plurality of antenna radiators.

Abstract: An antenna device is provided and includes a plurality of antenna radiators arranged in an array, a ground member in operable communication with the plurality of antenna radiators, a plurality of conductive cells arranged on the plurality of antenna radiators, and a plurality of feeding lines electrically connected to the plurality of antenna radiators.

Abstract: An antenna device includes a ground member including a plane part and a plurality of extension parts extending from one end of the plane part in a first direction and arranged along a second direction, a plurality of patch-type radiators arranged on the plane part along the second direction and configured to radiate vertical polarization, and a plurality of straight radiators spaced apart from the ground member, respectively arranged to be adjacent to the plurality of extension parts, extending in the first direction, and configured to radiate horizontal polarization.

Abstract: According to various embodiments of the present invention, disclosed is an electronic device comprising: a housing that comprises a front surface, a back surface opposite the front surface, and side surfaces surrounding a space between the front surface and the back surface and made of a metal material; at least one antenna array disposed within the housing so as to radiate a millimeter wave signal toward the inside of the electronic device; a wireless communication circuit electrically connected to the at least one antenna array and configured to communicate by using the millimeter wave signal; and a reflecting member arranged such that the millimeter wave signal radiated from the at least one antenna array is reflected toward the outside of the electronic device. In addition, various embodiments known from the specification are possible.

Abstract: An antenna device includes a ground member including a plane part and a plurality of extension parts extending from one end of the plane part in a first direction and arranged along a second direction, a plurality of patch-type radiators arranged on the plane part along the second direction and configured to radiate vertical polarization, and a plurality of straight radiators spaced apart from the ground member, respectively arranged to be adjacent to the plurality of extension parts, extending in the first direction, and configured to radiate horizontal polarization.

Abstract: An antenna device includes a ground member including a plane part and a plurality of extension parts extending from one end of the plane part in a first direction and arranged along a second direction, a plurality of patch-type radiators arranged on the plane part along the second direction and configured to radiate vertical polarization, and a plurality of straight radiators spaced apart from the ground member, respectively arranged to be adjacent to the plurality of extension parts, extending in the first direction, and configured to radiate horizontal polarization.

Abstract: An electronic device includes a housing that includes a first plate, a second plate facing a direction opposite the first plate, and a side member surrounding a space between the first plate and the second plate, an antenna structure that includes a plurality of dielectric layers perpendicular to the side member and parallel to the first plate, a first array of conductive plates aligned in a first direction perpendicular to the first plate at a first dielectric layer of the dielectric layers, a second array of conductive plates spaced from the first array and aligned in the first direction at the first dielectric layer, wherein the second array is farther from the first plate than the first array, at least one ground plane positioned on at least one of the dielectric layers and interposed between the first array and the second array, when viewed from above the side member, and a wireless communication circuit electrically connected to the first array and the second array and configured to transmit and/or rece

Abstract: Provided are a novel isoprene synthase derived from sweet potato and a method of preparing isoprene using the same, and more specifically, a novel isoprene synthase derived from sweet potato, a gene encoding the isoprene synthase, a host cell transformed with the gene, and a method of preparing isoprene using the same. The isoprene synthase of the present invention may have higher isoprene productivity as compared to isoprene synthases known in the related art to thereby be effectively used in isoprene biosynthesis and preparation of an isoprene polymer using the same.

Abstract: An electronic device includes a first conductive plate, a second conductive plate that is spaced from the first conductive plate and is disposed parallel to the first conductive plate, a conductive element that is disposed in a space between the first conductive plate and the second conductive plate, a wireless communication circuit that is electrically connected with the first conductive plate and the conductive element, and a printed circuit board that is coupled with at least one side of the first conductive plate, at least one side of the second conductive plate, and one end of the conductive element. The wireless communication circuit is configured to transmit/receive a first radio frequency (RF) signal having a vertical polarization characteristic using the first conductive plate and the second conductive plate and to transmit/receive a second RF signal having a horizontal polarization characteristic using the conductive element.

Abstract: An electronic device is provided. The electronic device includes a housing including a first plate, a second plate facing the first plate and spaced from the first plate, and a side member surrounding a space between the first plate and the second plate, wherein the second plate includes a nonconductive material, at least one antenna element positioned within the space and positioned on a substrate parallel to the second plate, wherein the at least one antenna element is spaced from the second plate by a gap h, and a wireless communication circuit electrically connected to the antenna element and configured to transmit and/or receive a signal with a frequency between 20 GHz and 100 GHz and a wavelength corresponding to the frequency, wherein the gap h corresponds to n?/2, wherein n is an integer and ? is the wavelength.

Abstract: According to an embodiment, an electronic device comprises a housing comprising a first plate and a second plate facing away from to the first plate; and a substrate disposed between the first plate and the second plate and comprising a first side facing the first plate and a second side facing the second plate, wherein the substrate comprises, a first conductive plate disposed on a first insulating layers and facing the second side; a conductive pattern disposed on a second insulating layer, wherein the second conductive layer is between the first conductive layer and the first side; a second conductive plate disposed on a third insulating layer between the second insulating layer and the first side, and when the second plate is viewed from above the second side, the second plate at least partially overlaps with the first conductive plate; a ground plate disposed on a fourth insulating layer, wherein the fourth insulating layer is between the third insulating layer and the first side; a conductive via constr