Abstract: A cleaner can include a cleaner main body including a suction motor configured to generate a suction force to suction air containing dust on a cleaning surface, the cleaner main body being configured to separate the dust from the air suctioned; a nozzle placed on the cleaning surface and configured to suck the air containing dust on the cleaning surface; and an extension tube to which the nozzle is detachably connected, one end connected to the nozzle and the other end connected to the cleaner main body to guide the air containing dust from the cleaning surface to the cleaner main body.

Abstract: A nozzle for a cleaner has a nozzle housing including a nozzle base and a nozzle cover coupled to an upper side of nozzle base, the nozzle cover including a bottom wall recessed towards the nozzle base, a flow path forming portion positioned between the nozzle base and the nozzle cover, a connection tube positioned at a rear side of nozzle housing, a water tank positioned on the nozzle cover and a plurality of rotation cleaning units arranged on a bottom side of the nozzle base and spaced apart from each other in a lateral direction, each the plurality of rotation cleaning units including a rotation plate configured to be coupled to a mop.

Abstract: A nozzle for a cleaner includes a nozzle housing having a suction flow path through which air containing dust flows, a first rotation cleaning unit and a second rotation cleaning unit located on a bottom side of the nozzle housing, the first rotation cleaning unit and the second rotation cleaning unit being spaced apart from each other in a left-right direction of the nozzle housing, each of the first rotation cleaning unit and the second rotation cleaning unit having a rotation plate, a driving device located in the nozzle housing, and a water tank located on the nozzle housing, the water tank being configured to store water to be supplied to the first rotation cleaning unit and the second rotation cleaning unit. The water tank includes a first chamber, and a second chamber spaced apart from the first chamber in the left-right direction of the nozzle housing.

Abstract: A nozzle for a cleaner includes a nozzle housing having a suction flow path through which air containing dust flows, a first rotation cleaning unit and a second rotation cleaning unit located on a bottom side of the nozzle housing, the first rotation cleaning unit and the second rotation cleaning unit being spaced apart from each other in a left-right direction of the nozzle housing, each of the first rotation cleaning unit and the second rotation cleaning unit having a rotation plate, a driving device located in the nozzle housing, and a water tank located on the nozzle housing, the water tank being configured to store water to be supplied to the first rotation cleaning unit and the second rotation cleaning unit. The water tank includes a first chamber, and a second chamber spaced apart from the first chamber in the left-right direction of the nozzle housing.

Abstract: A three-dimensional (3D) semiconductor memory device includes a substrate including a cell array region, a connection region, and a block selection region between the cell array and connection regions, a stack structure including horizontal layers vertically stacked on the substrate, each of the horizontal layers including electrode portions extending in a first direction on the cell array and block selection regions and a connecting portion disposed on the connection region to connect the electrode portions in a second direction perpendicular to the first direction, and block selection gate electrodes intersecting sidewalls of the electrode portions of the horizontal layers on the block selection region. Each of the electrode portions includes a first semiconductor region having a first conductivity type on the cell array region and includes a channel dopant region having a second conductivity type different from the first conductivity type on the block selection region.

Abstract: A three-dimensional (3D) semiconductor memory device includes a substrate including a cell array region, a connection region, and a block selection region between the cell array and connection regions, a stack structure including horizontal layers vertically stacked on the substrate, each of the horizontal layers including electrode portions extending in a first direction on the cell array and block selection regions and a connecting portion disposed on the connection region to connect the electrode portions in a second direction perpendicular to the first direction, and block selection gate electrodes intersecting sidewalls of the electrode portions of the horizontal layers on the block selection region. Each of the electrode portions includes a first semiconductor region having a first conductivity type on the cell array region and includes a channel dopant region having a second conductivity type different from the first conductivity type on the block selection region.