Abstract: A semiconductor memory device includes; a first stacked structure including a first staircase portion, a second stacked structure on the first stacked structure and including a second staircase portion overlapping the first staircase portion, a first contact plug penetrating the first stacked structure and the second stacked structure, electrically connected to the first stacked structure and not electrically connected to the second stacked structure, and a second contact plug penetrating the first stacked structure and the second stacked structure, electrically connected to the second stacked structure and not electrically connected to the first stacked structure.

Abstract: A wall-mounted drum washing machine includes a housing having one or more through-holes in a rear surface thereof; and one or more fixing units having a first side or end fixed to a wall and a second side or end inserted in one of the through-hole(s), wherein each through-hole includes a guide having a cross-sectional area that decreases from a rear surface of the housing toward a front of the housing.

Abstract: A wall-mounted drum washing machine includes a housing having one or more through-holes in a rear surface thereof; and one or more fixing units having a first side or end fixed to a wall and a second side or end inserted in one of the through-hole(s), wherein each through-hole includes a guide having a cross-sectional area that decreases from a rear surface of the housing toward a front of the housing.

Abstract: A control method for a wall-mounted drum washing machine, which removes foams remaining in a detergent box and a conditioner box at a final stage of a spin-drying process of the wall-mounted drum washing machine, thereby maintaining the detergent box and the conditioner box in a clean state.

Abstract: A control method for a wall-mounted drum washing machine, which removes foams remaining in a detergent box and a conditioner box at a final stage of a spin-drying process of the wall-mounted drum washing machine, thereby maintaining the detergent box and the conditioner box in a clean state.

Abstract: An apparatus for detecting an error in the measurement of a water level in a washing machine includes a water level sensor measuring a water level in a washing tub; a water supply and drain device supplying water to the washing tub or discharging water from in the washing tub; and a control unit controlling the water supply and drain device to adjust the water level in the washing tub, and detecting a measurement error of the water level sensor based on a water level change measured by the water level sensor while the water level is adjusted.

Abstract: A method for controlling a drum type washing machine including a condensing duct configured to receive air from a tub, the method including supplying a first coolant into a storage unit in the condensing duct holding or maintain the first supply of the coolant in the storage unit; and supplying a second coolant into the storage unit after a preset or predetermined time period elapses is provided. The preset time period is shorter by a predetermined time length than an expected time period for thermal equilibrium between the coolant in the storage unit and the air in the condensing duct.

Abstract: A drum type washing machine includes a tub; a heating duct outside the tub, configured to heat air that circulates back to the tub; a condensing duct having one end connected to the tub and another end connected to the heating duct, configured to reduce moisture in the air from the tub; and a coolant supplying unit configured to supply coolant to the condensing duct. The condensing duct having an inner tube in which the air from the tub flows, and an outer tube surrounding at least a section or part of the inner tube. The coolant supplying unit is configured to supply the coolant to a space between the inner tube and the outer tube.

Abstract: A method for controlling a drum type washing machine including a condensing duct configured to receive air from a tub, the method including supplying a first coolant into a storage unit in the condensing duct holding or maintain the first supply of the coolant in the storage unit; and supplying a second coolant into the storage unit after a preset or predetermined time period elapses is provided. The preset time period is shorter by a predetermined time length than an expected time period for thermal equilibrium between the coolant in the storage unit and the air in the condensing duct.

Abstract: An apparatus for detecting an error in the measurement of a water level in a washing machine includes a water level sensor measuring a water level in a washing tub; a water supply and drain device supplying water to the washing tub or discharging water from in the washing tub; and a control unit controlling the water supply and drain device to adjust the water level in the washing tub, and detecting a measurement error of the water level sensor based on a water level change measured by the water level sensor while the water level is adjusted.

Abstract: A wall-mounted drum washing machine includes a housing having one or more through-holes in a rear surface thereof; and one or more fixing units having a first side or end fixed to a wall and a second side or end inserted in one of the through-hole(s), wherein each through-hole includes a guide having a cross-sectional area that decreases from a rear surface of the housing toward a front of the housing.

Abstract: A control method for a wall-mounted drum washing machine, which removes foams remaining in a detergent box and a conditioner box at a final stage of a spin-drying process of the wall-mounted drum washing machine, thereby maintaining the detergent box and the conditioner box in a clean state.