Abstract: A case for an electronic device includes: a soft protective cover having a back panel to cover a back portion of the electronic device and side walls extending from the back panel to cover side portions of the electronic device; a hard protective frame, constructed to removably mount on the soft protective cover and wrapping around the side walls of the soft protective cover. The hard protective frame comprises a disconnected side and two facing sides. The disconnected side is disconnected and has a first end portion and a second end portion; and a first mating means formed on the first and second end portions of the hard protective frame and corresponding portions of the side wall of the soft protective cover.

Abstract: An apparatus and method for diagnosing rotor shaft are disclosed herein. The apparatus for diagnosing a rotor shaft that is installed in a bearing so that the rotor shaft is rotated around an axis of rotation includes a measurement unit, a calculation unit, an image generation unit, and a diagnosis unit. The measurement unit measures first vibration signals at two points of the rotor shaft located on a surface perpendicular to the axis of rotation. The calculation unit generates second vibration signals, which are vibration signals at points located in a plane identical to the plane of the two points of the rotor shaft at which the first vibration signals are measured, based on the first vibration signals. The image generation unit generates an image based on the second vibration signals. The diagnosis unit diagnoses the rotor shaft based on the generated image.

Abstract: Disclosed herein is a washing machine including a damping device to be operable according to vibration displacement. In a washing machine including a damping device provided to damp a vibration transferred from a washing tub, the damping device includes a suspension member, a damping unit provided to move along the suspension member, and a friction unit provided in the damping unit to form a frictional force with the suspension member, and the friction unit is disposed while being spaced apart from an inner surface of the damping unit to be selectively movable depending on a level of the vibration of the washing tub.

Abstract: Provided are a device and a method for adjusting the number and size of air bubbles, more particularly, a device and a method for adjusting the number and size of air bubbles, capable of mixing a liquid and gas to form an air bubble mixture or air bubble water (water containing air bubble) and freely adjusting the number and size of air bubbles contained in the formed air bubble mixture to thereby be used in various fields.