Abstract: The touch panel according to a preferred embodiment of the present invention includes: a transparent substrate having one surface on which a first groove portion is formed and the other surface on which a second groove portion is formed; a first electrode formed on one surface of the transparent substrate so as to cross the first groove portion; and a second electrode formed on the other surface of the transparent substrate so as to cross the second groove portion.

Abstract: A power factor correction circuit, a power supply device and a vacuum cleaner using the same. The power supply device for a vacuum cleaner is applicable to a vacuum cleaner having a flexible hose. The power supply device for a vacuum cleaner includes: A power factor correction unit correcting a power factor of an AC voltage supplied from an AC power source; a rectifying unit rectifying the AC voltage power factor-corrected by the power factor correction unit into a direct current (DC) voltage and outputting the DC voltage; a smoothing unit smoothing the DC voltage output from the rectifying unit and outputting the smoothed the DC voltage; an a converting unit converting the smoothed DC voltage from the smoothing unit into an AC voltage, wherein the power factor correction unit uses a conductive line included in the flexible hose, as an inductor.

Abstract: Disclosed herein are a printed circuit board and a method of manufacturing the same. The printed circuit board includes a base substrate; a circuit layer including a connection pad having a vertically etched upper portion and formed on the upper portion of the base substrate; a solder resist layer formed on the upper portion of the base substrate and including an opening part exposing the connection pad; and a surface treatment layer formed on the upper portion of the connection pad exposed by the opening part.

Abstract: A front end module is disclosed. The front end module includes a plurality of antennas receiving different frequency band signals, respectively, an impedance matching circuit unit comprising a plurality of tuners respectively connected to the plurality of antennas to control impedance matching, a selection unit selecting one frequency band signal from multiple frequency band signals passing through the impedance matching circuit unit, a measuring unit measuring signal strength of a received signal selected at the selection unit, and a control unit controlling an operation of the selection unit and an impedance of the tuner according to the signal strength of the received signal measured at the measuring unit.

Abstract: A system, method and medium correcting a display image. The system includes a parameter calculation module to calculate a plurality of parameters required for a transform of a first image, based on a plurality of characteristic differences between the first image and a second image, into which the first image is to be transformed to visually match the second image, a first characteristic transform module to transform a first characteristic of the first image using the plurality of calculated parameters, the transformation resulting in an unrelated change to a second characteristic of the first image, and a second characteristic restoration module to restore the second characteristic changed by the transforming of the first characteristic.