Abstract: Provided are a method and energy harvesting system for extracting maximum power from an input source. When the energy harvesting system includes a converter, a sensing part, an artificial intelligence (AI) calculator, and a resistor part, the method includes: sensing an input voltage and an input current from the input source using the sensing part, converting the input voltage and the input current corresponding to analog values into digital values through an analog-to-digital converter (ADC) block, and transmitting the digital values to the AI calculator; calculating input power on the basis of the digital values using the AI calculator and acquiring an optimal sampling ratio for extracting maximum power on the basis of the input power; controlling a resistor divider ratio on the basis of the optimal sampling ratio to equalize a sampling ratio to the optimal sampling ratio; and performing a regulation operation through the converter.

Abstract: A technology associated with an electrical circuit, in particular, a zero current detection circuit, is disclosed. The disclosed zero current detection circuit includes a plurality of dynamic comparators. Operating clocks of the dynamic comparators are generated by a plurality of flip-flops each configured to latch an output of one dynamic comparator corresponding thereto and then to supply the latched output as a clock of another dynamic comparator downstream of the former dynamic comparator. The dynamic comparators is activated as power is supplied thereto only in a required period of a charging/discharging cycle of a boost type power converter.

Abstract: An indoor wireless positioning method includes receiving initial received signal strength indicator (RSSI) information from a reception unit; searching for a fingerprint matching measured initial RSSI information in a fingerprint database; determining a first location corresponding to the retrieved fingerprint to be an initial location of the reception unit; receiving additional RSSI information from the reception unit; extracting features of variability between the additional RSSI information and the initial RSSI information; searching for variability fingerprints matching the initial location and extracted RSSI variability features in a variability fingerprint database; and updating a second location to a current location of the reception unit when the second location corresponding to the retrieved variability fingerprint is different from the initial location, wherein the second location is a location in a candidate area within a preset distance range centered on the first location.

Abstract: Technology regarded to an electric circuit, particularly a zero current detection circuit, is disclosed. The proposed zero current detection circuit has a calibration circuit that calibrates an offset error thereof. The offset calibration circuit detects a delay between an output time point of the zero current detection circuit and a moment of change in voltage of the common node and outputs a calibration signal accordingly. The zero current detection circuit includes a pre-amplifier that calibrates a differential voltage according to an offset control signal and a phase comparator that detects a zero current point from the differential voltage.

Abstract: Disclosed is sensing calibration technology for permanently recording a calibration value of a measurement value when a temperature measurement circuit is manufactured. An environment emulating calibration circuit element configured to generate a calibration current emulating an environmental temperature is added to the temperature measurement circuit. The environment emulating calibration circuit element operates to change an output current of a temperature sensing circuit by the amount of change according to the environmental temperature according to a set state value input from an calibration device during factory calibration. During factory calibration, the external calibration device calculates a calibration value from output values measured while changing a set state of the environment emulating calibration circuit element and sets the calibration value in the temperature measurement circuit.

Abstract: Technology regarded to an electric circuit, particularly a zero current detection circuit, is disclosed. The proposed zero current detection circuit has a calibration circuit that calibrates an offset error thereof. The offset calibration circuit detects a delay between an output time point of the zero current detection circuit and a moment of change in voltage of the common node and outputs a calibration signal accordingly. The zero current detection circuit includes a pre-amplifier that calibrates a differential voltage according to an offset control signal and a phase comparator that detects a zero current point from the differential voltage.

Abstract: A technology associated with an electrical circuit, in particular, a zero current detection circuit, is disclosed. The disclosed zero current detection circuit includes a plurality of dynamic comparators. Operating clocks of the dynamic comparators are generated by a plurality of flip-flops each configured to latch an output of one dynamic comparator corresponding thereto and then to supply the latched output as a clock of another dynamic comparator downstream of the former dynamic comparator. The dynamic comparators is activated as power is supplied thereto only in a required period of a charging/discharging cycle of a boost type power converter.

Abstract: A display device can include a first sub light-emitting element, a second sub light-emitting element and a third sub light-emitting element. The first sub light-emitting element includes a 1-1 hole transport layer, a 1-2 hole transport layer disposed on the 1-1 hole transport layer, and a first organic light-emitting layer disposed on the 1-2 hole transport layer. The second sub light-emitting element includes a 2-1 hole transport layer, a 2-2 hole transport layer disposed on the 2-1 hole transport layer, and a second organic light-emitting layer disposed on the 2-2 hole transport layer. The third sub light-emitting element includes a 3-1 hole transport layer, a 3-2 hole transport layer disposed on the 3-1 hole transport layer, and a third organic light-emitting layer disposed on the 3-2 hole transport layer.

Abstract: Provided are a method and energy harvesting system for extracting maximum power from an input source. When the energy harvesting system includes a converter, a sensing part, an artificial intelligence (AI) calculator, and a resistor part, the method includes: sensing an input voltage and an input current from the input source using the sensing part, converting the input voltage and the input current corresponding to analog values into digital values through an analog-to-digital converter (ADC) block, and transmitting the digital values to the AI calculator; calculating input power on the basis of the digital values using the AI calculator and acquiring an optimal sampling ratio for extracting maximum power on the basis of the input power; controlling a resistor divider ratio on the basis of the optimal sampling ratio to equalize a sampling ratio to the optimal sampling ratio; and performing a regulation operation through the converter.

Abstract: A display device includes a display panel configured to include a first display area in which a plurality of first pixels are disposed, and a second display area in which a plurality of second pixels and a light-transmission area between the second pixels are disposed; and a sensor disposed corresponding to the second display area, wherein the second pixel includes a plurality of sub-pixels, the plurality of sub-pixels include a red sub-pixel including a red organic compound layer disposed between a first anode electrode and a first cathode electrode, a green sub-pixel including a green organic compound layer disposed between a second anode electrode and a second cathode electrode, and a blue sub-pixel including a blue organic compound layer disposed between a third anode electrode and a third cathode electrode, and a thickness of the green organic compound layer is larger than thicknesses of the red organic compound layer and the blue organic compound layer.

Abstract: An indoor wireless positioning method according to one embodiment of the present invention includes receiving initial received signal strength indicator (RSSI) information from a reception unit; searching for a fingerprint matching measured initial RSSI information in a fingerprint database; determining a first location corresponding to the retrieved fingerprint to be an initial location of the reception unit; receiving additional RSSI information from the reception unit; extracting features of variability between the additional RSSI information and the initial RSSI information; searching for variability fingerprints matching the initial location and extracted RSSI variability features in a variability fingerprint database; and updating a second location to a current location of the reception unit when the second location corresponding to the retrieved variability fingerprint is different from the initial location, wherein the second location is a location in a candidate area within a preset distance range ce

Abstract: A cosmetic stick case contains a magnetic member. The cosmetic stick case includes a cosmetic stick body, a cosmetic stick inserted into the cosmetic stick body, and a push button for drawing out the cosmetic stick to an outside by a pressing operation. The cosmetic stick body contains a first magnetic force member and the push button contains a second magnetic force member. Attractive force between the first magnetic force member and the second magnetic force member keeps the push button in a fixed state without being shaken while the push button is inserted into the cosmetic stick body.

Abstract: Disclosed is a cosmetic stick case using a magnetic force. The cosmetic stick case includes a cosmetic stick body, a cosmetic stick inserted into the cosmetic stick body, and a push button for drawing out the cosmetic stick to an outside by a pressing operation. The cosmetic stick body is provided with a first magnetic force member and the push button is provided with a second magnetic force member so that the push button is fixed without being shaken by the magnetic force.

Abstract: A slide type lipstick case prevents a cosmetic stick from sliding down when using the lipstick case, while maintaining soft sensitivity when operating the lipstick case, by: forming a button and a button guide slit into which the button is inserted on the outer peripheral surface of an outer case; connecting a slide member for moving the cosmetic stick upwards and downwards, to a rib of the button and the lower end of a cosmetic stick holder; forming control protrusions on the upper and lower side of the button guide slit; and forming friction protrusions, at the rib of the button, for interfering the upward and downward movements of the button by fractionizing button guide slit.

Abstract: The present device relates to a slide type lipstick case and, more particularly, to a slide type lipstick case which prevents a cosmetic stick from sliding down when using the lipstick case, while maintaining soft sensitivity when operating the lipstick case, by: forming a button and a button guide slit into which the button is inserted on the outer peripheral surface of an outer case; connecting a slide member f or moving the cosmetic stick upwards and downwards, to a rib of the button and the lower end of a cosmetic stick holder; forming control protrusions on the upper and lower side of the button guide slit; and forming friction protrusions, at the rib of the button, for interfering the upward and downward movements of the button by fractionizing button guide slit.