Abstract: A vehicle power conversion system includes an input power supply including an AC power input, a battery, a power factor correction circuit connected to the input power supply, a power transmission unit including an inverter connected in parallel to the battery, a three-phase motor connected to the inverter, and at least one relay connected to the three-phase motor and configured to transfer power between the input power supply and the battery, and a buck converter including a first switching element and a second switching element, connected in parallel to the power factor correction circuit, wherein an end of the second switching element is connected in parallel to the power transmission unit, and wherein the buck converter is configured to step down an output voltage of the power factor correction circuit and transfer the stepped down output voltage.

Abstract: The present disclosure relates to a method for preparing a copolymer, a copolymer prepared therefrom, and a thermoplastic resin composition including the copolymer. The method includes introducing and polymerizing an aromatic vinyl-based monomer, a vinyl cyan-based monomer, and an imide-based monomer, wherein the imide-based monomer is introduced at once in an amount of 1 wt % to 24 wt % before the start of polymerization, and is continuously introduced in an amount of 76 wt % to 99 wt % from the start of the polymerization.

Abstract: The present disclosure relates to a thermoplastic resin composition including a styrene-based copolymer comprising a (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a maleimide-based monomer; a first graft copolymer including an acrylic-based rubber polymer, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer; and a second graft copolymer comprising an acrylic-based rubber polymer, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer, wherein the styrene-based copolymer has a residual oligomer content of 0.37% by weight or less, and the acrylic-based rubber polymer of the first graft copolymer and the acrylic-based rubber polymer of the second graft copolymer have different average particle diameters. A method of preparing the thermoplastic resin composition, and a molded article including the thermoplastic resin composition are also disclosed.

Abstract: A pneumatic tire is proposed. The pneumatic tire may include an inner liner configured to maintain a pressure of air filled inside the pneumatic tire, a sealant layer disposed on an inner peripheral surface of the inner liner, and a sound absorbing material disposed adjacent to the sealant layer. The sealant layer may include a first sealant layer formed by a first sealant string adjacent to at least a portion of an inner peripheral surface of the inner liner. The sealant layer may also include a second sealant layer formed by a second sealant string adjacent to at least a portion of the first sealant layer. The second sealant layer may be equal to or smaller, in width, than the first sealant layer in an axial direction of the pneumatic tire. The sound absorbing material may be smaller in width than the first sealant layer in the axial direction.

Abstract: Provided is a thermoplastic resin composition which includes: a first graft copolymer including a C4 to C10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a second graft copolymer including a C4 to C10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a first styrene-based copolymer being a copolymer of a monomer mixture including a C1 to C3 alkyl-substituted styrene-based monomer, a vinyl cyan-based monomer, and a C1 to C3 alkyl (meth)acrylate-based monomer, wherein the first graft copolymer and the second graft copolymer have cores having mutually different average particle diameters. The thermoplastic resin composition is excellent in colorability, weather resistance, tensile strength, flexural strength, and impact strength.

Abstract: An embodiment apparatus includes a converter including a plurality of switching elements configured as a bridge circuit connected to an input terminal and having a plurality of bridge arms, wherein a topology of the converter is configured to be switchable to a full-bridge type topology or a half-bridge type topology, and wherein a resonant capacitor is connected to a midpoint between respective ones of the bridge arms, and a controller configured to switch the topology of the converter to the full-bridge type or the half-bridge type by controlling whether the resonant capacitor is activated based on a load current of the converter.

Abstract: The present disclosure relates to a styrene copolymer, a thermoplastic resin composition, and methods of preparing the styrene copolymer and the thermoplastic resin composition. More particularly, the present disclosure relates to a styrene copolymer having a low residual oligomer content and excellent transparency due to uniform polymerization of components to be added; and a thermoplastic resin composition including the styrene copolymer and an acrylic rubber graft copolymer and being suitable for a molded article having excellent heat resistance, scratch resistance, and surface appearance.

Abstract: Provided is a polymer production method including: batch-adding a reaction solution including a monomer mixture including a maleimide-based monomer, a vinyl aromatic monomer, and a vinyl cyanide-based monomer and an aqueous solvent to a reactor and initiating polymerization; and carrying out the polymerization while continuously adding the maleimide-based monomer and the aqueous solvent to the reactor, wherein the reaction solution satisfies the above Formula 1.

Abstract: The present invention relates to a method for preparing a vinyl chloride-based polymer, including: bulk polymerizing a vinyl chloride-based monomer in a polymerization reactor to prepare a vinyl chloride-based polymer; and adding water and vapor to the polymerization reactor, and heating to remove an unreacted vinyl chloride-based monomer, wherein an addition amount of the water is 0.500 to 5.000 parts by weight based on 100 parts by weight of the vinyl chloride-based polymer.

Abstract: The present disclosure relates to an apparatus and a method for controlling an LLC resonance converter. The apparatus includes a converter connected to an input terminal, including a plurality of switching elements constituting a bridge circuit, and enabling a topology change in the form of a full bridge and a half bridge; and a controller detecting a charge measurement value of a battery being charged with a power transferred by the converter, and changing a topology of the converter based on the charge measurement value. Since battery charging is performed by changing the topology of the converter in accordance with the charge measurement value of the battery, the LLC resonance converter can be controlled at an optimized frequency, the efficiency is increased, and cost savings can be achieved.

Abstract: The present invention relates to a method of preparing a polymer, which includes: adding a first reaction solution including an aqueous solvent and a monomer mixture including an alkyl-substituted aromatic vinyl-based monomer, an alkyl-unsubstituted aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to a reactor and initiating polymerization; and performing polymerization by continuously adding an alkyl-substituted aromatic vinyl-based monomer to the reactor, wherein the first reaction solution satisfies Expression 1 (see the description of the invention).

Abstract: A low voltage converter includes a transformer controller configured to control at least one switch to supply a high voltage of a main battery to a transformer. The transformer is configured to convert the high voltage of the main battery to a low voltage. An output circuit is configured to output the low voltage to a load or a battery through a capacitor coupled in series with an inductor is provided.

Abstract: A power conversion system for electrically driven mobility device includes a first energy storage device and a second energy storage device having a voltage output lower than a voltage of the first energy storage device, a relay having one terminal connected to the first energy storage device, a DC link capacitor connected to the other terminal of the relay, a first DC converter provided between the DC link capacitor and the second energy storage device and capable of bidirectional voltage conversion, and a controller configured to control the first DC converter to convert a level of the voltage of the second energy storage device and to apply the voltage having the converted level to the capacitor before switching of the relay from an off state to an on state to charge the DC link capacitor to a preset voltage or higher, and then to switch the relay to the on state.

Abstract: A display device is provided. The display device includes: a display substrate on which a plurality of light-emitting areas are defined; and a color conversion substrate on which a plurality of light-transmitting areas respectively associated with the plurality of light-emitting areas and light-blocking areas between the plurality of light-transmitting areas are defined, the color conversion substrate comprising color patterns in the light-blocking areas, and light-blocking members on the color patterns, wherein at least one of the light-emitting areas has an area smaller than the area of the light-transmitting area that overlaps it in a thickness direction, and the color patterns include a blue colorant.

Abstract: A vehicle power conversion apparatus is provided to reduce an overall system size by integrating a motor controller which generates power and a power supply apparatus which converts the power. The vehicle power conversion apparatus includes a driving motor which is connected to an engine and a power converter which selectively converts power in a plurality of modes to generate the power related to an operation of the driving motor. A first battery supplies the power for the conversion or receives the converted power.

Abstract: An etching composition for a silver-containing thin film includes an inorganic acid compound, a carboxylic acid compound, a sulfonic acid compound, a glycol compound, a nitrogen-containing dicarbonyl compound, a metal-based oxidizer, and water.

Abstract: A display device is provided. The display device includes: a display substrate on which a plurality of light-emitting areas are defined; and a color conversion substrate on which a plurality of light-transmitting areas respectively associated with the plurality of light-emitting areas and light-blocking areas between the plurality of light-transmitting areas are defined, the color conversion substrate comprising color patterns in the light-blocking areas, and light-blocking members on the color patterns, wherein at least one of the light-emitting areas has an area smaller than the area of the light-transmitting area that overlaps it in a thickness direction, and the color patterns include a blue colorant.

Abstract: A phosphoric acid-free etchant composition and a method of forming a wiring, the composition including about 40 wt % to about 60 wt % of an organic acid compound; about 6 wt % to about 12 wt % of a glycol compound; about 1 wt % to about 10 wt % of nitric acid, sulfuric acid, or hydrochloric acid; about 1 wt % to about 10 wt % of a nitrate salt compound; and water, all wt % being based on a total weight of the phosphoric acid-free etchant composition.

Abstract: Disclosed is a method for producing a diene-based graft copolymer resin, and a diene-based graft copolymer resin produced therefrom, the method including: adding, into a reactor, a polymerization solution containing a diene-based rubber polymer, an aromatic vinyl-based monomer, a vinyl cyan-based monomer, a polymerization initiator, and a reaction solvent, and polymerizing the polymerization solution to prepare a polymer; recovering a solution containing unreacted monomers and a reaction solvent from the polymerization solution, dispersing a releasing agent in the recovered solution, and then adding the solution into the front end of a volatilization tank; and removing the unreacted monomers and the reaction solvent from the volatilization tank.

Abstract: An apparatus of incorporating a non-isolated charger and a DC converter, may include a non-isolated charger including a non-isolated converter converting a level of input voltage and outputting converted voltage to a battery; and a DC converter including a first switch selectively making an electrical connection to a connection node of the non-isolated converter and the battery and a primary side circuit including at least some of switching elements included in the non-isolated converter and converting a level of voltage of the battery transmitted by the primary side circuit and outputting converted voltage.