Abstract: The present invention provides a polyamic acid aqueous solution composition capable of polymerizing polyamic acid in water rather than in an organic solvent, as well as achieving a high imidization rate during low-temperature curing.

Abstract: The present invention relates to an eco-friendly super-absorbent carboxymethyl cellulose polymer and a preparation method therefor, wherein the eco-friendly super-absorbent carboxymethyl cellulose polymer of the present invention is prepared by crosslinking carboxymethyl cellulose using an electron beam and thus has excellent biodegradability, and the polymer is free of toxic materials or microplastics and exhibits high absorbency and thus is suitable for use in sanitary products such as sanitary pads and diapers.

Abstract: Provided is a hologram printing method and apparatus using a hologram medium light efficiency map. A hologram printing method according to an embodiment emits a laser to a hologram medium, acquires an image by photographing light diffracted from the hologram medium, generates a light efficiency map of the hologram medium from the acquired image, and records hogels on the hologram medium by referring to the generated light efficiency maps of the hologram medium. Accordingly, light efficiency is measured on each hogel area, and hologram printing is performed by adjusting an intensity of a laser of each wavelength according to a hogel, so that uniformity of luminance and color of a hologram printing result can be enhanced.

Abstract: In a method for recovering a lithium precursor from a lithium secondary battery, an electrode powder is prepared from a lithium secondary battery. A calcium compound is mixed with the electrode powder to prepare a cathode active material mixture. The cathode active material mixture is reductively treated to form a preliminary precursor mixture. A lithium precursor is recovered from the preliminary precursor mixture. Accordingly, the lithium precursor is obtained with high purity without a complicated leaching process and an additional process resulting from a wet-based process using an acidic solution.

Abstract: There is provided an object attribute-based watermarking method for preventing leakage of a digital content. A video watermarking method according to an embodiment may acquire a requested video and watermarking information upon receiving a request for video streaming from a user, may determine some of objects appearing in the video according to the watermarking information, may transform attributes of the determined objects, and may stream the transformed video. Accordingly, by watermarking an attribute of an object appearing in a video differently according to a user and providing the video, a watermark may be difficult to perceive, robustness against various attacks may be guaranteed, and a leakage path of a content may be checked.

Abstract: A head-mounted display device includes a display panel and an optical system positioned on a front surface of the display panel, wherein the display panel sequentially includes a light emitting element unit, a retarder positioned on a front surface of the light emitting element unit, a reflective polarizer, and an absorptive polarizer, wherein the optical system includes a first curved lens configured to include a first retarder positioned on an inner surface and a beam splitter positioned on an outer surface and a second curved lens configured to include a second retarder positioned on an inner surface and a reflective polarizer positioned on an outer surface, wherein the first curved lens is positioned on the display panel, and the second curved lens is positioned on the first curved lens, and wherein the absorptive polarizer of the display panel includes an open portion from which the absorptive polarizer is removed.

Abstract: An apparatus for controlling a vehicle includes a communication device that communicates with an authentication device of the vehicle, and a processor that searches for the authentication device inside the vehicle and prevents a guide message for authentication from being output when at least one authentication device found inside the vehicle.

Abstract: A refrigerant composition according to embodiments of the present disclosure includes trifluoroiodomethane (R-131I), 1,1-difluoroethane (R-152a) and difluoromethane (R-32), wherein a content of the trifluoroiodomethane (R-131I) may be 20 to 60 wt. % based on a total weight of the refrigerant composition. Accordingly, environmental pollution caused by the refrigerant composition may be suppressed, and the cooling performance of the refrigerant composition may be improved.

Abstract: The present disclosure relates to a sauce composition for food which imparts crispness and eating convenience, and a method of manufacturing food using the same. Since the sauce composition of the present disclosure has a high sugar content and a high viscosity, when fried food is coated with the sauce composition, an amount of sauce or moisture included in the sauce adsorbed or transferred into fried food or batter is minimized, and most of the sauce is placed on the outermost surface of the batter. Thus, dampness of the fried food is prevented, and the crispy texture and flavor of the fried food may be implemented. In addition, since the sauce-coated fried food of the present disclosure may be obtained without a step of mixing the fried food with separate sauce, eating convenience of consumers may be improved.

Abstract: A mapping function extraction system includes a scan unit for generating appearance data of a multi-channel lens by scanning the multi-channel lens, a comparison unit for generating correction data by comparing the appearance data with pre-stored standard appearance data, and an extraction unit for generating a mapping function by applying the correction data to a pre-stored standard mapping function.

Abstract: There is provided a thin optical system for real-world occlusion in an augmented reality display. The optical system according to an embodiment includes: a first DCRA configured to reflect light beams focused on holes; a mask positioned on a light emitting surface of the first DCRA to pass or block the light beams emitted from the first DCRA; and a second DCRA configured to reflect the light beams which are focused on holes after passing through the mask. Accordingly, the optical system can implement real-world occlusion in the unit of pixel while having a thin form factor.

Abstract: A quantum dot including a core including a first semiconductor nanocrystal including zinc, selenium, and tellurium, and a semiconductor nanocrystal shell disposed on the core, the semiconductor nanocrystal shell including zinc, and selenium, sulfur, or a combination thereof, wherein the quantum dot does not include cadmium, a mole ratio of tellurium relative to selenium in the first semiconductor nanocrystal is greater than about 1:1, a mole ratio of a sum of selenium and sulfur relative to in the quantum dot is greater than about 1:1, a wavelength of a maximum emission peak of the quantum dot is in a range of about 500 nanometers (nm) to about 550 nm, and the quantum dot has quantum efficiency (QY) of greater than or equal to about 30%, a quantum dot-polymer composite including the quantum dot, a display device including the quantum dot-polymer composite, and an electroluminescent device including the quantum dot.

Abstract: A display device includes a display area including a first light-emitting area and a second light-emitting area; a peripheral area adjacent to the display area; pixels which emit incident light; an encapsulation layer covering the pixels; a first color-converting pattern corresponding to the first light-emitting area and having a refractivity; a transmission pattern corresponding to the second light-emitting area and through which the incident light is transmitted; a low refractivity layer is in the display area and facing the encapsulation layer with each of the first color-converting pattern and the transmission pattern therebetween, the low refractivity layer including: a resin and a hollow particle which define a refractivity lower than the refractivity of the first color-converting pattern; and a first dam structure in the peripheral area and spaced apart from the display area, the first dam structure and the transmission pattern being portions of a same material layer.

Abstract: The present invention relates to an alarming method for differentially generating an alarm, and a recording medium. According to one embodiment, a method for differentially providing an alarm in an alarming system linked to a drug injector may comprise the steps of: receiving state information from the drug injector; determining the priority of an alarm and an alarm type on the basis of the received state information of the drug injector and a response scenario corresponding to same; and differentially generating an alarm stimulating at least one or more from among visual, auditory, and tactile senses, on the basis of the priority and type of the alarm and the response scenario.

Abstract: A cathode active material for a lithium secondary battery includes a lithium-nickel metal oxide particle having a form of a secondary particle in which a plurality of primary particles are aggregated therein. The lithium-nickel metal oxide particle includes a penetration region formed in an area extending from a surface to a point 70% or less of a radius of the particle in a direction to a center of the particle. The penetration region includes a tungsten compound at an interface between the primary particles. A relative standard deviation (RSD) value calculated from results of measuring a tungsten content from the surface of the secondary particle to a depth of 10 10 nm 10 times at different points using an X-ray Photoelectron Spectroscopy (XPS) is in a range from 10% to 40%.

Abstract: A bioreactor for suspension cells is provided. The bioreactor for suspension cells may comprise: a frame unit; a driving unit mounted on the frame unit, and a cell culture unit including a housing having an inner space filled with a medium containing suspension cells, and a plurality of supports disposed in multiple stages in the inner space to be spaced at intervals from each other, the cell culture unit having one end axially coupled to the driving unit.

Abstract: The present invention relates to functionalized graphene having a functional group self-adsorbed onto silicon or a silicon compound, wherein the functionalized graphene has an interplanar distance of about 0.3558 nm to about 0.4790 nm.

Abstract: The present disclosure relates to a battery cell manufacturing apparatus assembling a battery cell including: an electrode assembly; an exterior material accommodating the electrode assembly therein; an electrode lead electrically connected to the electrode assembly and protruding to the outside of the exterior material; and an insulating portion insulating between the exterior material and the electrode lead, comprising: a supporting portion supporting a preliminary assembly in which the electrode assembly, the electrode lead, and the insulating portion are coupled; a photographing portion photographing a photographing area including the electrode lead and the insulating portion in the preliminary assembly; a transferring portion moving the preliminary assembly to a preset target area on the exterior material; and a controlling portion controlling at least one of the photographing portion, the transferring portion.

Abstract: A communication device of a vehicle transmits a charging permission request message to a server and receives charging permission information from the server. A charging requester is configured to transmit a charging request message including the charging permission information to a charging device and a power receiver is configured to receive a charging response message from the charging device and to wirelessly receive power from the charging device.

Abstract: A lithium composite transition metal oxide includes nickel (Ni), cobalt (Co), and manganese (Mn), wherein the lithium composite transition metal oxide includes two or more kinds of first dopants selected from the group consisting of Zr, Al, V, Co, and Mg and two or more kinds of second dopants selected from the group consisting of Ti, Y, Sr, Nb, Ba, and Ca, and particles of the lithium composite transition metal oxide has a crystallite size of 170-300 nm.