Abstract: A dressing is used for curing a wound, and includes a dressing body having a first plane to make contact with a wound of a patient and a second plane opposite to the first surface, a display unit provided on the second plane to display information, and having a flexibility, and a light irradiation device to apply light the wound of the patient. The light irradiation device includes a device board, at least one light emitting diode mounted on the device board, and a water-proof protective film provided on the light emitting diode to protect the light emitting diode.

Abstract: The present invention relates to a controller of an AC-DC converter, which controls an LED lighting using electricity of AC 100V to 250V which is used in a building or home, and more particularly, to a controller of an AC-DC converter for LED lighting, which is capable of effectively controlling brightness of an LED lighting.

Abstract: The present invention relates to a controller of an AC-DC converter, which controls an LED lighting using electricity of AC 100V to 250V which is used in a building or home, and more particularly, to a controller of an AC-DC converter for LED lighting, which is capable of effectively controlling brightness of an LED lighting.

Abstract: A low power frequency divider and a low power phase locked loop, which consume the least power. The low power frequency divider generates a frequency dividing signal by dividing a frequency of an input signal in a uniform ratio, and includes a phase to voltage converter, a comparator, a phase synchronization circuit, and a reset circuit. The phase to voltage converter generates a phase voltage signal corresponding to phase change of the input signal in response to a reset signal. The comparator generates a comparator signal by comparing the phase voltage signal and a reference phase voltage signal. The phase synchronization circuit generates the frequency dividing signal by matching phases of the input signal and the comparator signal. The reset circuit generates the reset signal in response to the comparator signal or the frequency dividing signal.

Abstract: A low power frequency divider and a low power phase locked loop, which consume the least power. The low power frequency divider generates a frequency dividing signal by dividing a frequency of an input signal in a uniform ratio, and includes a phase to voltage converter, a comparator, a phase synchronization circuit, and a reset circuit. The phase to voltage converter generates a phase voltage signal corresponding to phase change of the input signal in response to a reset signal. The comparator generates a comparator signal by comparing the phase voltage signal and a reference phase voltage signal. The phase synchronization circuit generates the frequency dividing signal by matching phases of the input signal and the comparator signal. The reset circuit generates the reset signal in response to the comparator signal or the frequency dividing signal.

Abstract: Provided is a handheld addition and subtraction trainer which is designed for kids to improve ability in addition and subtraction and in which a process of presenting an addition and subtraction question with random numbers on a display panel, a process of checking whether a user's answer is correct or not, and a process of presenting a next addition and subtraction question are repeatedly performed. Further, the handheld addition and subtraction trainer has a clock for measuring a user's ability in addition and subtraction by counting the number of correct answers and by measuring a time taken for finding an answer.

Abstract: Disclosed are a printed circuit board and a method for wiring signal lines on the same. Connecting lines for electrically connecting chip select pins of a semiconductor chip, no connect pins and address designate pins, are formed on a PCB. In case of an unstack type, a pad is connected to chip select pin and no connect functioning pin of other semiconductor chip via a first signal line. In case of a stack type, another pad used with a pad is connected to a no connect functioning pin and a chip select pin of the corresponding semiconductor chip having no connection with the first signal line via a second signal line. According to the type of semiconductor chip, e.g. unstack or stack type, a second connecting pad selectively connecting by a first jumper having almost zero resistance value, is disposed between the first and the second signal lines. A first connecting pad is also disposed at the second signal line, the first pad is selectively connected by a second jumper having zero resistance value.