Abstract: A secondary battery charging and discharging system includes an accommodation unit configured to accommodate a battery cell, a charging and discharging unit configured to be electrically connected to first and second electrode leads of the battery cell accommodated in the accommodation unit, and a cooler configured to supply cooled air to the battery cell accommodated in the accommodation unit. The cooler includes a blower fan, a heat sink, and a Peltier element positioned between the blower fan and the heat sink. A method of controlling an internal temperature of a secondary battery charging and discharging system is also provided.

Abstract: Disclosed is a method for producing hydrogen, carbon, and ethylene from a methane-containing feedstock even without recycling of unreacted methane by providing a single process or system in which a methane-containing feedstock is subjected to two methane conversion steps. The method includes a first conversion step of producing hydrogen and carbonaceous materials and a second conversion step of producing acetylene from unreacted methane and hydrogen discharged from the first conversion step while maintaining a good methane conversion and suppressing coke formation, followed by separating and recovering ethylene and hydrogen produced through selective hydrogenation of acetylene.

Abstract: Provided are a compound for an organic optoelectronic device represented by Chemical Formula 1, a composition for an organic optoelectronic device including the same, an organic optoelectronic device, and a display device. The content of Chemical Formula 1 is as defined in the specification.

Abstract: Disclosed is a process for converting methane into value-added compounds. In this process, a gas mixture containing hydrogen as well as high-concentration acetylene formed through methane pyrolysis (e.g. non-oxidative coupling of methane) is selectively hydrogenated in the presence of a bimetallic supported catalyst. This process obtains ethylene from acetylene in the gas mixture while unreacted methane and hydrogen are recovered as byproducts and/or additionally recycled.

Abstract: A compound for an organic optoelectronic device is represented by Chemical Formula 1, wherein Ar1 may be a substituted or unsubstituted C6 to C18 aryl group, L1 may be a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted C2 to C20 heteroarylene group, or a combination thereof, and L2 may be a single bond or a substituted or unsubstituted phenylene group.

Abstract: A laser crystallization device includes: a first solid-state laser generator which generates a first solid-state laser having a first energy intensity; a second solid-state laser generator which generates a second solid-state laser having a second energy intensity lower than the first energy intensity; and a third solid-state laser generator which generates a third solid-state laser having a third energy intensity lower than the first energy intensity.

Abstract: A compound for an organic optoelectronic device, a composition for an organic optoelectronic device including the same, an organic optoelectronic device, and a display device, the compound being represented by Chemical Formula 1:

Abstract: A compound for an organic optoelectronic device, an organic optoelectronic device including the same, and a display device, the compound being represented by Chemical Formula 1:

Abstract: Provided are a compound for an organic optoelectronic device represented by Chemical Formula 1, a composition for an organic optoelectronic device, an organic optoelectronic device including the same, and a display device. Details for Chemical Formula 1 are as defined in the specification.

Abstract: Disclosed is a switch circuit for an ultra-high frequency band, which includes a transistor including a first terminal connected to an input stage, a second terminal connected to an output stage, and a gate terminal, an inductor connected to the transistor in parallel, between the input stage and the output stage, a variable gate driver to apply a gate input voltage to the gate terminal and, an input resistor connected between the variable gate driver and the gate terminal. The variable gate driver adjusts the gate input voltage to be in one of a first voltage level for turning on the transistor and a second voltage level for turning off the transistor. The second voltage level varies depending on a capacitance between the first terminal and the second terminal, when the transistor is in a turn-off state.

Abstract: The present disclosure relates to a method and device for providing training content. A method may comprise displaying a question card including a first area and a second area; determining a recommended question using an artificial intelligence (AI) model trained on the basis of training data of a user; displaying, on the first area of a screen of a learner terminal, a plurality of prediction values for information obtained by analyzing a correlation between the training ability of the user and the recommended question using the AI model, together with the recommended question; displaying summary information about the recommended question on the second area of the screen of the learner terminal; and displaying a question object of the recommended question on the screen of the learner terminal when the user decides to solve the recommended question on the basis of the plurality of prediction values and the summary information.

Abstract: Provided is a semi-permanent hair dye composition, and particularly, a foam-type semi-permanent hair dye composition which is easily applied onto the inner part of the hair due to having high foam forming ability and high foam retention and exhibits less color fading after dyeing and excellent colorability. The semi-permanent hair dye composition includes a pigment penetration agent, a cationic surfactant, and a non-ionic surfactant as well as a basic pigment.

Abstract: A conductive pattern is disclosed that includes a conductive layer including aluminum, a first capping layer disposed on the conductive layer and including titanium, and a second capping layer disposed on the first capping layer and including titanium nitride. A mixed region in which the aluminum and the titanium are mixed with each other is disposed in at least portions of the conductive layer and the first capping layer.

Abstract: Disclosed herein are operation methods of a memory controller which controls a memory device. The method includes storing write data in a first area of the memory device, extracting first error position information indicating a position of at least one error included in data stored in the first area, storing the first error position information in a second area of the memory device, reading read data from the first area of the memory device, reading the first error position information from the second area of the memory device, refining the read data based on the first error position information to generate refined data, performing soft decision decoding based on the refined data to generate corrected data, and outputting the corrected data.

Abstract: A washing machine having a plurality of washing apparatuses is disclosed. By providing the plurality of washing apparatuses, it is possible to separately wash the laundry as needed. In addition, by controlling the plurality of washing apparatuses using one power button and an additional option button, it is possible to implement the control panel that is easy to operate and convenient to use.

Abstract: A washing machine having a plurality of washing apparatuses is disclosed. By providing the plurality of washing apparatuses, it is possible to separately wash the laundry as needed. In addition, by controlling the plurality of washing apparatuses using one power button and an additional option button, it is possible to implement the control panel that is easy to operate and convenient to use.

Abstract: A compound for an organic optoelectronic device, a composition for an organic optoelectronic device including the same, an organic optoelectronic device, and a display device, the compound being represented by Chemical Formula 1:

Abstract: An organic optoelectronic device and a display device, the organic optoelectronic device including an anode and a cathode facing each other, a light emitting layer between the anode and the cathode, a hole transport layer between the anode and the light emitting layer, and a hole transport auxiliary layer between the light emitting layer and the hole transport layer, wherein the light emitting layer includes a first compound represented by a combination of Chemical Formula 1 and Chemical Formula 2, and a second compound represented by Chemical Formula 3, and the hole transport auxiliary layer includes a third compound represented by Chemical Formula 4: