Abstract: A secondary battery according to the present disclosure comprises a cathode, an anode facing the cathode, and a gel polymer electrolyte including a cross-linkable monomer, a polymerization product of the cross-linkable monomer, and a liquid electrolyte. A conversion rate of the cross-linkable monomer is 85% or more. Accordingly, side reactions with the electrolyte may be prevented, and the cycle life of the battery may be improved.

Abstract: The present disclosure relates to methods and systems based on digital rights management (DRM), and more particularly to DRM-based encryption/decryption methods and encryption/decryption systems that can encrypt/decrypt content using metadata. The DRM-based content encryption system of the present disclosure may include a content provider that encrypts content to be encrypted based on encryption information received from a DRM server to generate encrypted content, a DRM server that provides said encryption information to the content provider based on a request from the content provider, a decryption server that provides decryption information corresponding to the encryption information to the user terminal based on a request from the user terminal, and the user terminal that decrypts the encrypted content based on the decryption information received from the DRM server to generate decrypted content.

Abstract: A system and a method for split-rendering for persons with color weakness are proposed. The split-rendering method may include, by a service server, in response to a login of a user device, loading a color weakness profile corresponding to a user of the logging-in user device. The method may also include, by the service server, in response to the user being color-weak in accordance with the loaded color weakness profile, selecting one of a plurality of split-rendering servers. The method may further include, by the service server, transmitting a video content along with the color weakness profile to the selected split-rendering server, and by the service server, transmitting access information about the selected split-rendering server to the user device.

Abstract: A root canal cleaning device according to one embodiment of the present invention comprises: an acoustic pressure generating unit that operates in response to the electric input; a handpiece housing that accommodates the acoustic pressure generating unit; a coolant passage formed inside the handpiece housing; a coolant inlet that communicates with the coolant passage formed inside the handpiece housing; and a cleaning solution nozzle formed in the handpiece housing, wherein an ultrasonic acoustic pressure applied to a coolant is transmitted to a cleaning solution by the acoustic pressure generating unit, and vapor bubbles are generated in the cleaning solution by the transmitted ultrasonic acoustic pressure, and target contaminants inside the tooth including the root canal is removed by the action of the vapor bubbles and the cleaning solution on a tooth being treated. The cleaning solution includes a degassed liquid.

Abstract: Provided herein may be a memory controller and a memory system including the same. The memory controller may include an error correction circuit configured to perform error correction decoding on data that is read by read retry operations, a buffer memory configured to store decoding history information including retry fail voltages used for a failure in the read retry operations and syndrome weights respectively corresponding to the retry fail voltages, and a processor configured to, when a number of times that the read retry operations fail reaches a threshold number of times, determine a voltage corresponding to a minimum syndrome weight determined based on a relationship between changes in the syndrome weights relative to magnitudes of the retry fail voltages, to be an optimally estimated read voltage, and provide data that is read using the optimally estimated read voltage to the error correction circuit.

Abstract: A low-latency 360 virtual reality (VR) streaming method for estimating a region of interest (ROI) of a user is proposed. The method may include receiving device pose information from a user device, extracting an ROI of a user, based on the device pose information, and generating ROI tile information corresponding to the ROT. The method may also include generating ROI estimation tile information corresponding to a position at which the ROI is to be changed, and requesting, from a streaming server, a tile corresponding to the ROI tile information and the ROI estimation tile information to receive a high-quality tile stream and a low-quality tile stream of full video that includes a low-quality full video tile stream. The method may further include decoding and rendering the high-quality tile stream and the low-quality full video tile stream and providing the rendered video to the user device.

Abstract: Disclosed herein are a method and apparatus for a video streaming of an extended reality device. According to an embodiment, the method for the video streaming may include a receiving situation information including user location information and pose information at a current point in time from the extended reality device, predicting changes in user location information and pose information at a preset next point in time using pre-learned artificial intelligence receiving, as input, situation information at the current point in time and situation information at a preset previous point in time, rendering an image texture of a video based on the predicted changes in user location information and pose information at the next point in time and transmitting image data with the image texture rendered at the next point in time to the extended reality device, wherein the situation information at the current point in time and the situation information at the present previous point in time configure consecutive frames.

Abstract: A memory device may include a read controller and an error correction circuit. The read controller may sequentially perform a plurality of read retry operations on a memory device. The error correction circuit may perform a plurality of first error correction decodings on read data respectively acquired from the plurality of read retry operations, store a plurality of Unsatisfied Syndrome Check (USC) values respectively produced by the plurality of first error correction decodings, and perform a second error correction decoding based on read data corresponding to a minimum USC value among the plurality of USC values.

Abstract: Methods and systems for streaming DRM content are disclosed, and specific embodiments of the present disclosure can prevent communication degradation between a DRM server and a client terminal by reconstructing three-dimensional AR objects of DRM content packaged with an encryption key into a predetermined number of resolutions and then streaming them in segments, decrypting the three-dimensional AR objects of each received resolution matching a client authentication authority, and rendering them over a rendered low-resolution single image.

Abstract: Disclosed herein are a method and apparatus for point cloud video streaming. According to an embodiment, the method for point cloud video streaming may include receiving pose information from a user terminal changing the pose of a virtual camera in a virtual space where a point cloud video is played, by applying the pose information to the virtual camera, rendering an image texture of the point cloud video corresponding to a viewpoint of the virtual camera with the changed pose and transmitting video data with the rendered image texture to the user terminal.

Abstract: Disclosed herein are a method and apparatus for a camera calibration. According to an embodiment, the method for the camera calibration may include a recognition unit configured to recognize a captured calibration pattern, a selection unit configured to select, among a plurality of preset calibration algorithms, a calibration algorithm corresponding to the recognized calibration pattern and an execution unit configurated to perform camera calibration by using the selected calibration algorithm and the captured calibration pattern.

Abstract: A method of fabricating a semiconductor device includes providing a substrate, forming a target film, a first mask film, a second mask film, and an upper mask pattern on the substrate, forming a first spacer pattern that includes a first line portion and a second line portion, and a folding portion that connects the first line portion and the second line portion, forming a slit mask pattern that partially covers the first spacer pattern, forming a first mask pattern by patterning the second mask film using the slit mask pattern and the first spacer pattern as an etching mask, forming a second spacer pattern, forming a second mask pattern by patterning the first mask film using the second spacer pattern as an etching mask, and forming a plurality of target patterns by patterning the target film using the second mask pattern as an etching mask.

Abstract: A low-latency 360 virtual reality (VR) streaming method for estimating a region of interest (ROI) of a user is proposed. The method may include receiving device pose information from a user device, extracting an ROI of a user, based on the device pose information, and generating ROI tile information corresponding to the ROT. The method may also include generating ROI estimation tile information corresponding to a position at which the ROI is to be changed, and requesting, from a streaming server, a tile corresponding to the ROI tile information and the ROI estimation tile information to receive a high-quality tile stream and a low-quality tile stream of full video that includes a low-quality full video tile stream. The method may further include decoding and rendering the high-quality tile stream and the low-quality full video tile stream and providing the rendered video to the user device.

Abstract: Provided herein may be a memory controller and a memory system including the same. The memory controller may include an error correction circuit configured to perform error correction decoding on data that is read by read retry operations, a buffer memory configured to store decoding history information including retry fail voltages used for a failure in the read retry operations and syndrome weights respectively corresponding to the retry fail voltages, and a processor configured to, when a number of times that the read retry operations fail reaches a threshold number of times, determine a voltage corresponding to a minimum syndrome weight determined based on a relationship between changes in the syndrome weights relative to magnitudes of the retry fail voltages, to be an optimally estimated read voltage, and provide data that is read using the optimally estimated read voltage to the error correction circuit.

Abstract: An augmented reality (AR) streaming device interoperating with an edge server is proposed. The AR streaming device may include a sensing module including a camera and a certain inertia sensor, a display module streaming AR video, a communication module transmitting or receiving data to or from the edge server and the sensing module. The device may also include a memory and a processor executing a program stored in the memory. When image data and inertia data are obtained through the sensing module, the processor may perform synchronization and encoding on the image data and the inertia data to transmit to the edge server through the communication module. When segmentation rendering-processed AR video is received from the edge server, the processor may perform decoding and blending on the segmentation rendering AR video to perform control to be streamed through the display module.

Abstract: A haptic effect transmission method for providing real-time immersive content according to the present invention includes executing participatory content in which one or more users participate, collecting motion information of the users participating in the participatory content through a haptic device, multiplexing the motion information with video and audio files of the participatory content to obtain a multiplexed file, and demultiplexing the multiplexed file and providing the demultiplexed file to a display device and a haptic device of a client terminal.

Abstract: A system and a method for split-rendering for persons with color weakness are proposed. The split-rendering method may include, by a service server, in response to a login of a user device, loading a color weakness profile corresponding to a user of the logging-in user device. The method may also include, by the service server, in response to the user being color-weak in accordance with the loaded color weakness profile, selecting one of a plurality of split-rendering servers. The method may further include, by the service server, transmitting a video content along with the color weakness profile to the selected split-rendering server, and by the service server, transmitting access information about the selected split-rendering server to the user device.

Abstract: A memory device may include a read controller and an error correction circuit. The read controller may sequentially perform a plurality of read retry operations on a memory device. The error correction circuit may perform a plurality of first error correction decodings on read data respectively acquired from the plurality of read retry operations, store a plurality of Unsatisfied Syndrome Check (USC) values respectively produced by the plurality of first error correction decodings, and perform a second error correction decoding based on read data corresponding to a minimum USC value among the plurality of USC values.

Abstract: A haptic effect transmission method for providing real-time immersive content according to the present invention includes executing participatory content in which one or more users participate, collecting motion information of the users participating in the participatory content through a haptic device, multiplexing the motion information with video and audio files of the participatory content to obtain a multiplexed file, and demultiplexing the multiplexed file and providing the demultiplexed file to a display device and a haptic device of a client terminal.

Abstract: A method of fabricating a semiconductor device includes preparing a substrate including a cell region and a peripheral region having different active region densities, forming cell trenches for limiting cell active regions in the cell region so that the cell active regions are formed to be spaced apart by a first width in a first direction and by a second width in a second direction, forming peripheral trenches for limiting a peripheral active region in the peripheral region, and forming, in the cell trenches, a first insulating layer continuously extending in the first and second directions and contacting sidewalls of the cell active regions, and having a thickness equal to or greater than half of the first width and less than half of the second width.