Abstract: A liquefied gas storage tank includes a corner block disposed on a corner portion, wherein the corner block includes a lower block, an upper block and an upper connecting block, the upper block includes a first inner fixing unit and a second inner fixing unit respectively provided inside a first surface and a second surface, bonded and connected to a secondary barrier, and each having a structure in which a primary inner plywood, a primary corner insulating material, and a primary outer plywood are stacked, and an inner bent portion installed at a corner spatial portion between the first inner fixing unit and the second inner fixing unit, and both side surfaces of the inner bent portion that are perpendicular to the secondary barrier each have a height reduced from a total height of each of the first and second inner fixing units.

Abstract: The liquefied gas storage tank includes a primary barrier, a primary insulation wall, a secondary barrier, and a secondary insulation wall. In a state where unit elements are arranged adjacent to each other, each of the unit elements being formed by stacking the secondary insulation wall, the secondary barrier, and a fixed insulation wall which is a part of the primary insulation wall, the primary insulation wall may comprise: a connection insulation wall provided in the space between the adjacent fixed insulation walls; first slits formed between the fixed insulation walls and the connection insulation wall when the connection insulation wall is inserted and installed between the adjacent fixed insulation walls; a plurality of second slits formed in a lengthwise direction and a widthwise direction of the fixed insulation walls; and a first insulating filler material for filling the first slits.

Abstract: According to an electronic key device capable of wirelessly controlling a lock system and transmitting control authentication of a lock system, a system therefor, and a method therefor, which are presented in the present invention, an operation of the lock system is controlled by communicating with the lock system, and an electronic key can be simply transmitted and rented, at a long distance through a communication network, by communicating with another electronic key device and granting operation control authority of the lock system to the other electronic key device.

Abstract: According to an electronic key device capable of wirelessly controlling a lock system and transmitting control authentication of a lock system, a system therefor, and a method therefor, which are presented in the present invention, an operation of the lock system is controlled by communicating with the lock system, and an electronic key can be simply transmitted and rented, at a long distance through a communication network, by communicating with another electronic key device and granting operation control authority of the lock system to the other electronic key device.