Abstract: A semiconductor package includes a redistribution substrate having a first side and an opposite second side. A plurality of redistribution patterns are in the redistribution substrate, and a semiconductor chip is on the first side of the redistribution substrate. A plurality of metal pillars are positioned around and spaced apart from a periphery of the semiconductor chip and are connected to the redistribution patterns. A plurality of solder balls are on the second side of the redistribution substrate. Each of the metal pillars includes a third side facing the first side of the redistribution substrate, and an opposite fourth side. The fourth side has a square or octagonal shape in plan view.

Abstract: Disclosed are a propulsion device for a ship and a ship having same. The propulsion device, according to an embodiment of the present invention, comprises: a rear propeller fixed to a driveshaft; a front propeller positioned in front of the rear propeller, and supported rotably on the driveshaft; and a counter rotation device for reversing and transmitting the rotation of the driveshaft to the front propeller; a motor for rotating the driveshaft; and an housing, which extends from to the lower part of the hull, and which is installed so as to envelope the counter rotation device and the motor.

Abstract: Disclosed herein is a propulsion apparatus for ships. The propulsion apparatus, which includes a front propeller and a rear propeller to rotate in opposite directions and provides propulsion power to propel a hull of a ship, includes a power unit to supply power to rotate the rear propeller, a main shaft to transfer the power supplied from the power unit to the rear propeller, a hollow shaft extending in a longitudinal direction of the main shaft to allow the main shaft to pass therethrough and coupled to the front propeller, a drive motor including a rotor coupled to an outer circumferential surface of the hollow shaft and a stator supported by the hull, the drive motor rotating the hollow shaft in a direction opposite to a direction of rotation of the main shaft, and an electricity supply unit to supply electricity to the drive motor.

Abstract: Disclosed are a propulsion device for a ship and a ship having same. The propulsion device, according to an embodiment of the present invention, comprises: a rear propeller fixed to a driveshaft; a front propeller positioned in front of the rear propeller, and supported rotably on the driveshaft; and a counter rotation device for reversing and transmitting the rotation of the driveshaft to the front propeller; a motor for rotating the driveshaft; and an housing, which extends from to the lower part of the hull, and which is installed so as to envelope the counter rotation device and the motor.

Abstract: Disclosed are a propulsion device for a ship and a ship having same. The propulsion device, according to an embodiment of the present invention, comprises: a rear propeller fixed to a first driveshaft; a front propeller positioned in front of the rear propeller and supported rotably on the first driveshaft; a counter rotation device, which penetrates the hull, and which counter-rotates the front propeller and the rear propeller on the basis of the rotation of a second driveshaft, which is installed perpendicular to the first driveshaft; and a housing installed so as to envelope the second driveshaft and the counter rotation device.

Abstract: Disclosed is an excitation force reducing type ship. An excitation force reducing type ship according to one embodiment of the present invention comprises: a hull having a rear end with a propeller; and an excitation force reducing module which forms an air layer for generating reflected waves on a surface of the hull neighboring the propeller during an operation of the propeller so as to reduce the excitation force in the direction of the hull, wherein the excitation force reducing module can be arranged eccentrically with respect to a center line penetrating through the center of the axis of rotation of the propeller in a vertical direction of the hull.

Abstract: Disclosed herein is a propulsion apparatus for ships. The propulsion apparatus, which includes a front propeller and a rear propeller to rotate in opposite directions and provides propulsion power to propel a hull of a ship, includes a power unit to supply power to rotate the rear propeller, a main shaft to transfer the power supplied from the power unit to the rear propeller, a hollow shaft extending in a longitudinal direction of the main shaft to allow the main shaft to pass therethrough and coupled to the front propeller, a drive motor including a rotor coupled to an outer circumferential surface of the hollow shaft and a stator supported by the hull, the drive motor rotating the hollow shaft in a direction opposite to a direction of rotation of the main shaft, and an electricity supply unit to supply electricity to the drive motor.