Abstract: A tandem solar cell includes a substrate a plurality of sub-cells stacked on the substrate and configured to sequentially perform photoelectric conversion with different wavelength band, and a metal disk array disposed on at least one of interfaces between adjacent sub-cells. A center wavelength of wavelength bands corresponding to the sub-cells gradually decreases as progressing downward with respect to an uppermost layer. The metal disk array reflects a light transmitting a sub-cell disposed over the metal disk array without being absorbed therein. The metal disk array is inserted by means of wafer bonding.

Abstract: Disclosed is a powerless humidification module for an air cleaner which is capable of preventing leakage of water into the air cleaner. A powerless humidification module for an air cleaner which is detachably mounted on an upper portion of a body of the air cleaner and is capable of preventing leakage of water includes a base cover having a first opening opened toward the air cleaner and a second opening opened toward a side surface of the first opening, a cistern part located in the interior of the base cover and located such that a space defined between an inner partition wall and an outer partition wall having predetermined heights such that water supplied to one side thereof is stored surrounds a periphery of the first opening whereby water supplied to one side thereof is stored, and a humidification filter located in the second opening.

Abstract: The present invention provides an air purifier that includes: a purifier body; a first air blower which is provided in the purifier body to introduce, purify and discharge outside air; an air guidance part which is provided on the movement path of the air discharged from the first air blower and is pivotably coupled to the upper end of the purifier body to guide an air discharge direction; and a second air blower which is installed on the air guidance part to blow air.

Abstract: An air purifier capable of adjusting wind directions according to an embodiment of the present invention comprises: a housing having an air outlet port on one side thereof; an air guide having a front end portion disposed at the center of the air outlet port such that the air outlet port becomes a ring shape and a rear end portion extending in a direction toward the other surface of the housing and coupled to the inside of the housing so as to be rotatable in a direction inclined with respect to the air release direction of the air outlet port; and a rotation-restraining portion for restraining the rotation of the air guide by elastically supporting the air guide on the housing.

Abstract: The present invention provides an air purifier including a plurality of bi-directional fans, which are arranged to be misaligned in a vertical direction such that the discharge directions of discharge ports are different from each other.

Abstract: A wind-direction adjustable air purifier according to an embodiment of the present invention comprises: a housing provided with an air discharge opening formed on one surface thereof; an air guide having a front end disposed in a center of the air discharge opening and a rear end extending toward the other surface of the housing such that the air discharge opening has a ring shape; and a rotation guide coupled to the inside of the housing so as be rotatable in the circumferential direction of the air discharge opening, and supporting the air guide in by the housing, wherein the air guide can be coupled to the rotation guide so as to be rotatable in a direction inclined relative to the air discharge direction of the air discharge opening.

Abstract: A robot purifier including: a purifying part which draws, purifies, and discharges air; and a driving part which is located at a lower end of the purifying part and is capable of autonomous driving, wherein the purifying part is capable of rotating 360 degrees horizontally, and the purifying part also is capable of rotating vertically such that an air intake direction and an air discharge direction in the vertical and horizontal directions is controllable.

Abstract: The present invention relates to a method for preparing a two-dimensional transition metal dichalcogenide and, more particularly, to a method for preparing a highly uniform two-dimensional transition metal dichalcogenide thin film. More specifically, the present invention is directed to a preparation method for a highly uniform two-dimensional transition metal dichalcogenide thin film at low temperature of 500° C. or below.

Abstract: A tandem solar cell includes a substrate a plurality of sub-cells stacked on the substrate and configured to sequentially perform photoelectric conversion with different wavelength band, and a metal disk array disposed on at least one of interfaces between adjacent sub-cells. A center wavelength of wavelength bands corresponding to the sub-cells gradually decreases as progressing downward with respect to an uppermost layer. The metal disk array reflects a light transmitting a sub-cell disposed over the metal disk array without being absorbed therein. The metal disk array is inserted by means of wafer bonding.

Abstract: A compressor noise suppressing structure including a dehumidifier. The compressor noise suppressing structure includes an installation member fixed to a base frame to support and accommodate a component installed within a housing, and a noise-proof member attached to the installation member and extending towards a first end of the base so as to cover at least one side of the compressor. According to the configuration of the compressor noise suppressing structure, noise generated when the compressor is operated is simultaneously blocked by the nose-proof member and the housing, and the installation member and the noise-proof member are configured as a single component.

Abstract: An air purifier according to the present disclosure includes: a memory for storing a flow rate/pressure differential correlation graph with regard to each filter utilization state; a pressure differential sensor for measuring a pressure differential, which is a difference in pressure between the front and rear ends of the filter; and a filter replacement time management unit for determining the time to replace the filter according to a result of matching a pressure differential of the filter, which is measured by the pressure differential sensor at a preset cycle, and the flow rate of air flowing into the filter during pressure differential measurement with the flow rate/pressure differential correlation graph for each utilization state.

Abstract: Disclosed is an air purifier which can secure a high air volume and a rapid flow velocity of discharged air, and also can achieve aesthetic improvement in design. The air purifier according to an embodiment of the present invention comprises: a housing; a blower fan which is provided inside the housing; and an annular discharge flow path which configures a path through which air inside the housing which flows by the blower fan is discharged to the outside, is formed inside the housing while having an annular discharge end, and has a cross-section which becomes narrower from, the inside of the housing towards the discharge end.

Abstract: The present invention relates to a novel recombinant batroxobin mixture, a hemostatic composition comprising the same, and a method for preparing the same. According to the present invention, the hemostatic composition of the present invention has an excellent hemostatic effect by suppressing rebleeding, and maintains activity thereof even when prepared in a solid form, and thus, the composition of the present invention can be easily used by being applied as a topical hemostatic agent.

Abstract: The present invention provides an air purifier. The air purifier according to one preferred embodiment, of the present invention may comprise: a housing; a blowing unit installed in the housing so as to draw in external air; and a filter unit having filtering surfaces, through which the air passes and which are disposed in multiple directions, and an air inflow space, which has at least a part thereof surrounded by the filtering surfaces disposed in the multiple directions and into which the air discharged from, the blowing unit flows.

Abstract: Disclosed is a slim-type air processing device adopting a centrifugal fan which is capable of air suction on both sides of the device. The disclosed slim-type air processing device comprises: a housing; a centrifugal fan provided inside the housing; an air suction part which is formed in the housing and is provided in the radial direction of the centrifugal fan; and an air processing part which is mounted in the housing, is disposed on a flow path of air flowing from the air suction part to the centrifugal fan, and processes air passing therethrough in a manner of at least one of dehumidification, humidification, and purification. According to the slim-type air processing device, it is possible to efficiently use the entire area of a filter, and to obtain an effect in which the device has a smaller size and has an improved design.

Abstract: The present invention relates to a method for preparing a two-dimensional transition metal dichalcogenide and, more particularly, to a method for preparing a highly uniform two-dimensional transition metal dichalcogenide thin film. More specifically, the present invention is directed to a preparation method for a highly uniform two-dimensional transition metal dichalcogenide thin film at low temperature of 500° C. or below.

Abstract: A power factor correction circuit and an electronic product including the same are disclosed. This technology configures a bridgeless circuit with no rectifier diode by using an additional switch, eliminating conduction loss due to the diode and reducing common mode EMI noise of the power factor correction circuit. A power factor correction circuit includes at least one inductor directly connected to an AC input stage, an output capacitor to smooth the output voltage, first switching elements to control current to store magnetic energy in the inductor, and a second switching element to maintain a substantially constant voltage between a ground voltage of an AC input stage and a ground voltage of an output stage.

Abstract: The present invention provides an air purifier comprising: a purifier body; a first air blowing means which is provided in the purifier body to introduce, purify and discharge outside air; an air guidance part which is provided on the movement path of the air discharged from the first air blowing means and is pivotably coupled to the upper end of the purifier body to guide an air discharge direction; and a second air blowing means which is installed on the air guidance part to blow air.

Abstract: The present disclosure relates generally to a switch driving circuit and power factor correction circuit having the same, and more particularly, to a technology to provide a negative offset using Zener diodes to prevent malfunctions in driving a switch. The switch driving circuit to operate a switch implemented with a Field Effect Transistor (FET) includes a first Zener diode connected to a control input end of the switch; a capacitor connected in parallel with the first Zener diode; and second and third Zener diodes for providing a negative offset to fix a voltage applied between the gate and source of the switch to a negative value.

Abstract: An air purifier according to an embodiment of the present invention may comprise: a memory for storing a flow rate/pressure differential correlation graph with regard to each filter utilization state; a pressure differential sensor for measuring a pressure differential, which is a difference in pressure between the front and rear ends of the filter; and a filter replacement time management unit for determining the time to replace the filter according to a result of matching a pressure differential of the filter, which is measured by the pressure differential sensor at a preset cycle, and the flow rate of air flowing into the filter during pressure differential measurement with the flow rate/pressure differential correlation graph for each utilization state.