Abstract: The present invention relates to an apparatus for controlling the operation of an LED and to a method for controlling the drive current thereof. More particularly, the present invention relates to an apparatus for controlling the operation of an LED, which is capable of driving a direct current-operated LED module or an alternating current-operated LED module using alternating current power, and to a method for controlling the drive current of the apparatus. According to the present invention, the drive current of an LED array can be output in the form of a sine wave by a constant-current regulation or constant-power regulation even when input voltage varies, thus suppressing harmonics, improving the power factor, minimizing flicker, and preventing a temperature increase in the LED array and in an LED operation control circuit.

Abstract: A method for manufacturing a silicon-based nanocomposite anode active material for the lithium secondary battery and the lithium secondary battery using same, comprising the following steps: a first step of mounting a silicon-based wire between two electrodes, which are placed in a methanol-based solvent atmosphere, and manufacturing a dispersion solution in which silicon-based nanoparticles are dispersed by means of high-voltage pulse discharging; and a second step of manufacturing a silicon-based nanocomposite body by compositing the silicon-based nanoparticles in the solution and a different type of material.

Abstract: A photovoltaic power conditioning system and method is provided. The system includes an isolated DC/DC converter (41), a DC/AC inverter (42), and a sine filter (43). The isolated DC/DC converter (41) receives a DC voltage from a solar cell through a parallel connection structure and converts the DC voltage into another DC voltage and then outputs the converted DC voltage through a series connection structure. The DC/AC inverter (42) converts the DC voltage output from the isolated DC/DC converter into an AC voltage. The sine filter (43) performs sine filtering on the AC voltage output from the DC/AC inverter and outputs the filtered AC voltage. The system employs a topology allowing it to be responsible for part of the output capacity, thereby significantly reducing the required capacity and increasing the system efficiency, so that the system can be applied to small and large-capacity photovoltaic power generation.

Abstract: There is disclosed an apparatus for femtosecond laser optically pumped by a laser diode pumping module that is able to mechanically couple optical mounts for mounting optical mounts to each other by using a bar with a low thermal expansion coefficient and to form a light pumping module distant from a laser platform or a case, to provide a stable mode locking for an ultrashort laser and to enhance a power stability and a beam stability.

Abstract: An active voltage drop control-type pulse power generator includes power stages, a power inverter, a power loop, a control inverter, a control loop, and a compensation unit. The power stages include power cells connected in series. Each power cell includes a switch and a capacitor connected in series, a driver for driving the switch, a bypass diode connected to both ends of the switch, and a rectifying diode connected to both ends of the capacitor. The power inverter charges the capacitor via the power loop and the rectifying diode inside each power cell. The control inverter provides a control signal for the switch via the control loop and the driver inside each power cell. The compensation unit is connected to one of the power cells and generates a compensation voltage for compensating for a voltage drop at a load according to a voltage detected in real-time from the power cell.

Abstract: The present invention provides a cylindrical magnetic levitation stage and an exposure apparatus, which can form a nanoscale pattern of a large area directly on the surface of a large cylinder. The present invention provides an exposure apparatus including a new type of cylindrical magnetic levitation stage, which can levitate, rotate, and move a cylinder in the axial direction by the principle of magnetic levitation in a non-contact manner and form a nanoscale pattern on the surface of the cylinder, and a light source for irradiating light on the surface of the cylinder, thereby reducing the position error of the cylindrical magnetic levitation stage to a nanoscale size and correcting the error caused by mechanical processing in real time.

Abstract: Provided are an electronic device and a fabrication method thereof. The electronic device according to the concept of the present invention includes auxiliary interconnections disposed on a substrate, a light extraction layer that is provided on the substrate and fills between the auxiliary interconnection, and a first electrode provided on the auxiliary interconnections and the light extraction layer, wherein the light extraction layer may have a first surface facing the substrate and a second surface opposite to the first surface, the first surface may have protrusions, and the auxiliary interconnections may include a material having a lower resistance than the first electrode. Since electrical properties of the electronic device are improved, uniform light emission characteristics may be realized.

Abstract: A high precision DC/DC resonant converter with a wide load range includes a first switch leg having one end connected to an anode terminal of a DC power source and the other connected to a cathode terminal of the DC power source to independently operate at a switching frequency used in an application of an output voltage for no load or a light load equal to or less than a rated load; and one or more second switch legs having one end connected to the anode terminal of the DC power source and the other end connected to the cathode terminal of the DC power source to operate at a switching frequency for the rated load or a frequency equal to or less than the switching frequency used in the application of the output voltage for no load or the light load that the first switch leg takes charge of.

Abstract: Disclosed is a deposition apparatus for depositing a specific substance on an elongate substrate such as an elongate strip of tape or film. The apparatus includes a vacuum chamber, supply reel and the for reel for supplying elongate substrate in rolled form, a drum, disposed in the vacuum chamber, the drum having a helically-shaped guide groove formed along an outer surface of the drum for receiving the elongate substrate supplied from the supply reel to be wound in the guide groove and to subsequently feed the elongate substrate to a retreat reel to wind thereon upon rotation of the drum, and a deposition source material for depositing a material onto a surface of the elongate substrate which is wound on the drum.

Abstract: Disclosed herein are a method for manufacturing a functional material for use in various industrial fields in which anisotropy or physical properties change according to height may be utilized, as well as a functional material manufactured thereby. The method includes the steps of: (1) mixing powders composed of the components of the functional material with a binder to prepare a mixed paste; (2) coating the mixed paste on a substrate, and then separating the coated material from the substrate, thus preparing a slice; (3) repeating step (2) to prepare a plurality of slices, and stacking the slices in a mold; and (4) pressing the stacked slices at a predetermined temperature and pressure. A multifunctional material, such as an anisotropic material having physical properties which change according to the direction of material, or a material having physical properties which change in a graduated manner according to height, may be manufactured in a simple and economical manner.

Abstract: There is disclosed a femtosecond laser apparatus including a first laser material comprising Ng, Np and Nm axes spatially perpendicular to each other; a second laser material comprising Np axis, Nm axis and Ng axis; and a first laser diode and second laser diodes, wherein the traveling direction of laser beams generated from the first and second laser materials is substantially parallel to Ng axis of the first laser material and the polarizing direction of laser beams generated from the first and second laser materials is substantially parallel to Np axis of the first laser material, and the traveling direction of laser beams generated from the first and second laser materials is substantially parallel to Np axis of the second material and the polarizing direction of laser beams generated from the first and second laser materials is substantially parallel to Nm axis of the second laser material.

Abstract: Provided is a method for suppressing a circulating current in a modular multi-level converter for a high voltage direction-current (HVDC) transmission system. The HVDC transmission system converts an alternating current (AC) into a direct current (DC) and vice versa, transmits energy using a DC cable, and including a modular multilevel converter generating a high voltage source by stacking a plurality of sub-modules in series. In the circulating current suppression method, a circulating current (idiffj; j=a,b,c) of a,b,c phase in an abc 3-phase stationary reference frame, a DC current (idc) flowing in a DC cable, a current reference value (i*dc) of a DC component that needs to flow in the DC cable are inputted. The circulating current (idiffj) of the a,b,c phase is controlled to become zero. A compensation value (V*diffj) for suppressing a harmonic component of the circulating current is outputted.

Abstract: A one-dimensional conductive nanomaterial-based conductive film having the conductivity thereof enhanced by a two-dimensional nanomaterial in which the conductive film includes a substrate, a one-dimensional conductive nanomaterial layer formed on the substrate, and a two-dimensional nanomaterial layer formed on the one-dimensional conductive nanomaterial layer, wherein the one-dimensional conductive nanomaterial layer includes a one-dimensional conductive nanomaterial formed of at least one selected from a carbon nanotube, a metal nanowire, and a metal nanorod, and the two-dimensional nanomaterial layer includes a two-dimensional nanomaterial formed of at least one selected from graphene, boron nitride, tungsten oxide (WO3), molybdenum sulfide (MoS2), molybdenum telluride (MoTe2), niobium diselenide (NbSe2), tantalum diselenide (TaSe2), and manganese dioxide (MnO2).

Abstract: Disclosed herein is a transparent conductive polycarbonate film coated with carbon nanotubes, including a transparent conductive layer formed by applying a mixed solution of carbon nanotubes and a binder on one side or both sides of a transparent polycarbonate film, and a touch panel using the transparent conductive polycarbonate film as a lower transparent electrode. The present invention provides a transparent conductive polycarbonate film coated with a mixed solution of carbon nanotubes and a binder, by which a touch panel having high transmissivity can be manufactured by directly forming a transparent conductive layer on a polycarbonate film used as a protective film of a liquid crystal display using carbon nanotubes, without using a polyethylene terephthalate (PET) substrate used for a transparent electrode of a conventional touch panel, by which the production cost of the touch panel can be decreased, and by which a thin touch panel can be manufactured.

Abstract: An active voltage drop control-type pulse power generator includes power stages, a power inverter, a power loop, a control inverter, a control loop, and a compensation unit. The power stages include power cells connected in series. Each power cell includes a switch and a capacitor connected in series, a driver for driving the switch, a bypass diode connected to both ends of the switch, and a rectifying diode connected to both ends of the capacitor. The power inverter charges the capacitor via the power loop and the rectifying diode inside each power cell. The control inverter provides a control signal for the switch via the control loop and the driver inside each power cell. The compensation unit is connected to one of the power cells and generates a compensation voltage for compensating for a voltage drop at a load according to a voltage detected in real-time from the power cell.

Abstract: The present invention provides a pressing-type cylindrical metal air battery which comprises: an external case which is formed in a cylindrical shape, and has a cathode terminal on one side and an anode terminal hole on the other side; an internal case which is formed in a cylindrical shape and coaxially inserted into the inside of the external case, has an anode terminal that is inserted into or extracted from the inside or the outside of the anode terminal hole on one side, and has an air inflow hole on the surface of a wall so that air can flow into the air inflow hole; and an elastic sealing means which is formed on the one side of the internal case, enables the air to flow into the anode terminal hole by elastically pressurizing the anode terminal when a battery is inserted into a battery compartment, and seals the anode terminal hole by elastically restoring the anode terminal again if the battery is separated from the battery compartment.

Abstract: A rolled superconducting article includes: a cylindrical bobbin having a post in a cylindrical shape; a superconducting strip wound on the cylindrical bobbin in a rolled shape with a predetermined tension applied, wherein the superconducting strip is formed of a superconducting thin film, which is coated with a metal coating layer on a facing surface of the superconducting thin film, and a stabilizing substrate wound on the superconducting strip, wherein the stabilizing substrate is coated with a metal coating layer on a facing surface of the stabilizing substrate; an anti-bonding substrate wound on an outer surface of the stabilizing substrate with a predetermined tension applied; wherein the superconducting thin film is thermally adhered to the stabilizing substrate by heat-treating the rolled superconducting strip with the anti-bonding substrate wound therearound.

Abstract: The present invention relates to an apparatus for controlling the operation of an LED and to a method for controlling the drive current thereof. More particularly, the present invention relates to an apparatus for controlling the operation of an LED, which is capable of driving a direct current-operated LED module or an alternating current-operated LED module using alternating current power, and to a method for controlling the drive current of the apparatus. According to the present invention, the drive current of an LED array can be output in the form of a sine wave by a constant-current regulation or constant-power regulation even when input voltage varies, thus suppressing harmonics, improving the power factor, minimizing flicker, and preventing a temperature increase in the LED array and in an LED operation control circuit.

Abstract: Disclosed herein is a method of manufacturing a hybrid packaging material, comprising the steps of: (a) forming a colloidal inorganic nanosol; (b) surface-treating the inorganic nanosol of step (a) with an organic metal alkoxide containing an organic function group by stirring the inorganic nanosol together with the organic metal alkoxide; (c) replacing a solvent of the inorganic nanosol with an organic solvent different in type from the solvent to prepare an organic solvent-type inorganic nanosol; (d) substituting the organic solvent of the inorganic nanosol of step (c) with a functional organic monomer or a silicon compound, followed by concentration to prepare a solvent-free organic-inorganic hybrid material; and (e) adding a nanoclay dispersed in a solvent to the solvent-free organic-inorganic hybrid material.

Abstract: A flexible dye-sensitized solar cell includes: a fiber layer formed of nanofibers; a conductive electrode layer formed on one side of the fiber layer; a photoelectrode layer formed on the conductive electrode layer; a counter electrode layer formed on the other side of the fiber layer; a sealing member for enclosing the fiber layer, the conductive electrode layer, the counter electrode layer and the photoelectrode layer therein so as to seal said layers from the outside; and an electrolyte infiltrated into the fiber layer. A cell body in which an electrode and a photoelectrode are formed on one surface of the fiber that contains an electrolyte therein and a counter electrode is formed on the other side of the fiber is sealed with a polymer film, thus forming a flexible solar cell having an excellent sealing structure for preventing the electrolyte from leaking out of the cell even when pressure is externally applied.