Abstract: A compressor including a shaft, a flange to support shaft, and a muffler to reduce noise generated in a compression chamber of the compressor. The flange including a plurality of noise reductions units each of which is formed to have a different volume and at least a portion of the noise reduction unit is covered by the muffler.

Abstract: In a substrate processing method, a cleaning process is performed at a first temperature to remove a portion of a cumulative layer that is deposited within a chamber by deposition processes (step 1). The deposition processes are performed at the first temperature on a plurality of substrates within the chamber respectively (step 2). The step 1 and the step 2 are performed alternately and repeatedly.

Abstract: A robot vacuum cleaner that may increase cleaning efficiency around obstacles includes a main body having an intake to suck in dust and air while the main body is driven on a floor, a shutter installed in front of the intake to be able to move from the main body toward the floor, and a shutter driver configured to supply power to move the shutter.

Abstract: In a substrate processing method, a cleaning process is performed at a first temperature to remove a portion of a cumulative layer that is deposited within a chamber by deposition processes (step 1). The deposition processes are performed at the first temperature on a plurality of substrates within the chamber respectively (step 2). The step 1 and the step 2 are performed alternately and repeatedly.

Abstract: Provided is a three-dimensional rigid ball driving system including: a support frame having a polyhedral shape; a rigid ball positioned at the center of an inner portion of the support frame; a plurality of ball bearings installed at corners of inner sides of the support frame, respectively, and contacting a surface of the rigid ball; and a plurality of electromagnets disposed around the ball bearings and generating magnetic fields to rotate the rigid ball; and a controller controlling the electromagnets to control a rotation direction and a rotation speed of the rigid ball.

Abstract: Provided is a non-adhesive type vibration reduction apparatus comprising: a support; a body; and an elastomer, wherein the elastomer is coupled in a non-adhesive manner in which an adhesive is not used, thereby preventing a separation of and reducing a damage of an elastomer which result from a weakening of an adhesive force.

Abstract: Provided is a method for estimating and calibrating an absolute misalignment between an attitude control sensor of a satellite or a flight vehicle imaging and transmitting ground images having high resolution and an imaging payload.

Abstract: Provided is a non-adhesive type vibration reduction apparatus comprising: a support; a body; and an elastomer, wherein the elastomer is coupled in a non-adhesive manner in which an adhesive is not used, thereby preventing a separation of and reducing a damage of an elastomer which result from a weakening of an adhesive force.

Abstract: Provided is a method for estimating and calibrating an absolute misalignment between an attitude control sensor of a satellite or a flight vehicle imaging and transmitting ground images having high resolution and an imaging payload.

Abstract: The present invention relates to a method of measuring the rotating speed of a sphere for controlling the posture of a satellite. The method includes: an accelerometer installing operation in which a pair of accelerometers is installed at each accelerometer coordinate axis, the accelerometers being located in the sphere; an accelerometer coordinate axis alignment operation in which the accelerometer coordinate axes are aligned to allow the accelerometer coordinate axes to be in line with system coordinate axes, respectively; an acceleration measuring operation in which a current is applied to an electromagnet to rotate the sphere and sequentially measure the acceleration; an acceleration calculating operation in which only the acceleration generated by the rotation of the sphere is calculated; and a rotating speed calculating operation in which the rotating speed of the sphere with respect to each coordinate axis is calculated using the acceleration.

Abstract: Provided is a three-dimensional rigid ball driving system including: a support frame having a polyhedral shape; a rigid ball positioned at the center of an inner portion of the support frame; a plurality of ball bearings installed at corners of inner sides of the support frame, respectively, and contacting a surface of the rigid ball; and a plurality of electromagnets disposed around the ball bearings and generating magnetic fields to rotate the rigid ball; and a controller controlling the electromagnets to control a rotation direction and a rotation speed of the rigid ball.

Abstract: A showerhead includes a body configured to receive a reaction gas, a nozzle on the body configured to inject the reaction gas to a substrate, and a plurality of conducting members in thermal contact with the body to conduct heat generated from the substrate.

Abstract: Provided are an attitude control system and method of a spacecraft of an artificial satellite that may enhance a maneuverability and a controllability by simultaneously applying a reaction wheel and a thruster among drive units used to maneuver an attitude of the spacecraft of the artificial satellite. The attitude control system may include: a thruster-based attitude controller which control firing time of thrusters mounted on the spacecraft; and a reaction wheel-based attitude controller controlling driving of a reaction wheel mounted on the spacecraft. The spacecraft may include a plurality of reaction wheels. When a defect occurs in the spacecraft due to a partial malfunction of the reaction wheels, an attitude maneuverability of the spacecraft may be corrected by simultaneously applying the thruster-based attitude controller and the reaction wheel-based attitude controller.

Abstract: A base member including two-step recesses and a hard disk drive (HDD) including the same. The HDD includes a base member; a spindle motor installed in the base member; a data storage disk assembled to the spindle motor; and an actuator rotatably installed in the base member and for moving a read/write head to a desired position on the disk, wherein the base member includes: a first floor surface disposed in a region facing the disk and having a center portion in which the spindle motor is installed; a shroud formed on a circumference of the first floor surface and extending the exterior circumference of the disk; and two-step recesses formed in an operating region of the actuator, wherein the two-step recesses comprise a first step recess formed on the first floor surface and a second step recess formed on a floor surface of the first step recess.

Abstract: A hard disk drive (HDD) includes a base including a voice coil motor (VCM) which drives an actuator, a cover combined with an upper surface of the base, and a magnetic leakage flux reducer adjacent to the VCM to reduce a magnetic leakage flux leaked from the VCM. Therefore, the HDD includes a simple structure to be made light and reduces the magnetic leakage flux which affects the VCM.

Abstract: A base member including two-step recesses and a hard disk drive (HDD) including the same. The HDD includes a base member; a spindle motor installed in the base member; a data storage disk assembled to the spindle motor; and an actuator rotatably installed in the base member and for moving a read/write head to a desired position on the disk, wherein the base member includes: a first floor surface disposed in a region facing the disk and having a center portion in which the spindle motor is installed; a shroud formed on a circumference of the first floor surface and extending the exterior circumference of the disk; and two-step recesses formed in an operating region of the actuator, wherein the two-step recesses comprise a first step recess formed on the first floor surface and a second step recess formed on a floor surface of the first step recess.

Abstract: A spindle motor assembly includes a spindle motor, a disk for storing data, the disk being installed on the spindle motor, and a disk clamp for fixing the disk to the spindle motor. The disk clamp includes a hollow formed in a central portion thereof, a coupling portion formed around an external circumference of the hollow and including a plurality of screw insertion holes into which clamp fastening screws to be coupled to the spindle motor are inserted, and a pressing portion formed around an external circumference of the coupling portion to press the disk. The coupling portion includes a first region and a second region that are asymmetrical with respect to each other, the plurality of screw insertion holes are formed in the first region only, and a thickness extension portion or a through hole is formed in at least a portion of the second region.

Abstract: A hard disk drive (HDD) apparatus includes a connector combined with a side of a printed circuit board (PCB) and with a connection terminal of a flexible printed cable (FPC), a flip pivotably combined with the connector to lock the connection terminal into and unlock the connection terminal from the connector, and an area increasing and strength reinforcing portion formed at the flip to increase a handling area of the flip and reinforce strength of the flip.

Abstract: A hard disk drive, in which a flexible printed circuit board (FPC) bracket is readily assembled and sealed to a base together with a gasket header even though a screw or a sealing tape that involves a screw driver or other assembling tools is not used, or a boss of the base is not tapped.

Abstract: Provided are an attitude control system and method of a spacecraft of an artificial satellite that may enhance a maneuverability and a controllability by simultaneously applying a reaction wheel and a thruster among drive units used to maneuver an attitude of the spacecraft of the artificial satellite. The attitude control system may include: a thruster-based attitude controller which control firing time of thrusters mounted on the spacecraft; and a reaction wheel-based attitude controller controlling driving of a reaction wheel mounted on the spacecraft. The spacecraft may include a plurality of reaction wheels. When a defect occurs in the spacecraft due to a partial malfunction of the reaction wheels, an attitude maneuverability of the spacecraft may be corrected by simultaneously applying the thruster-based attitude controller and the reaction wheel-based attitude controller.