Abstract: A bulk acoustic resonator comprises a membrane including a piezoelectric film having multiple layers of piezoelectric material. At least one of the multiple layers of piezoelectric material has a different dopant concentration than another of the multiple layers of piezoelectric material.

Abstract: A method of calculating a collision risk of a ship according to an embodiment of the present disclosure may include: calculating an available velocity area based on maneuvering performance of a host ship; calculating a velocity obstacle area where there is a possibility of collision between an object and the host ship; and calculating a collision risk based on at least one of the available velocity area, the velocity obstacle area, and a preset weight.

Abstract: A device according to an aspect includes a memory in which at least one program is stored and at least one processor configured to execute the at least one program, wherein the at least one processor obtains information about a candidate object using a distance detection sensor, obtains an image of the candidate object using an image capturing sensor, determines whether the candidate object is a real object using the image of the candidate object, and displays a marker containing information about the candidate object determined to be a real object on a monitoring image.

Abstract: A wafer-level package module includes a first substrate having a first bulk acoustic wave (BAW) device mounted thereon with a first aluminum nitride piezoelectric layer. The wafer-level package module further includes a second substrate having a second BAW device mounted thereon with a second aluminum nitride piezoelectric layer. The first BAW device has a electromechanical coupling coefficient (kt2) different from the second BAW device.

Abstract: A doorbell apparatus and a method of controlling power supply to a doorbell apparatus are provided. The doorbell apparatus may include a power supplier, a battery device charged with power from the power supplier device, a doorbell controller driven using the power from the power supplier device or the power charged in the battery device, and a power supply controller configured to control supply of power to the doorbell controller according to whether the power is input from the power supplier device.

Abstract: A doorbell apparatus and a method of controlling power supply to a doorbell apparatus are provided. The doorbell apparatus may include a power supplier, a battery device charged with power from the power supplier device, a doorbell controller driven using the power from the power supplier device or the power charged in the battery device, and a power supply controller configured to control supply of power to the doorbell controller according to whether the power is input from the power supplier device.

Abstract: Disclosed is a broadcasting receiver. The broadcasting receiver comprises a low noise block down converter outputting a signal by amplifying a received signal, a tuner tuning a plurality of broadcasting channels based on the signals output from the low noise block down converter, and a frequency drift detector detecting frequency drifts of the broadcasting channels tuned by the tuner, and correcting oscillation frequencies of at least one of the low noise block down converter and the tuner.

Abstract: A method for receiving satellite broadcasting includes: amplifying an inputted satellite broadcasting signal; converting the amplified signal to a baseband signal by mixing the amplified signal with a center frequency of a selected channel; and varying a channel bandwidth of the baseband signal.

Abstract: Disclosed is a broadcasting receiver. The broadcasting receiver comprises a low noise block down converter outputting a signal by amplifying a received signal, a tuner tuning a plurality of broadcasting channels based on the signals output from the low noise block down converter, and a frequency drift detector detecting frequency drifts of the broadcasting channels tuned by the tuner, and correcting oscillation frequencies of at least one of the low noise block down converter and the tuner.

Abstract: A method for receiving satellite broadcasting includes: amplifying an inputted satellite broadcasting signal; converting the amplified signal to a baseband signal by mixing the amplified signal with a center frequency of a selected channel; and varying a channel bandwidth of the baseband signal.