Abstract: Provided is an electrical steel sheet comprising: a groove formed in a surface of a steel sheet, wherein the groove includes a bottom surface, a first side surface extending from the bottom surface, and a second side surface extending from the bottom surface in opposite to the first side surface, wherein the groove has a depth from the surface to the bottom surface, a width in a rolling direction of the steel sheet, and a length in a width direction of the steel sheet, and wherein the groove is formed through laser-irradiation and removal of melt produced by the laser-irradiation; an opening defined by the bottom surface, the first side surface and the second side surface; and a first solidification portion formed on the first side surface of the groove. The first solidification portion is formed by a solidification of part of the melt produced from the laser-irradiation.

Abstract: Provided is a method and device for refining a magnetic domain of a grain-oriented electrical steel plate. The magnetic domain refining method of a grain-oriented electrical steel plate for stable permanent magnetic domain refining processing even if a steel plate is transferred at high speed of 2 m/s or more includes zigzag controlling for straightly transferring the steel plate without being inclined in right and left directions along a production line center, tension controlling for applying tension to the steel plate to maintain the steel plate in a flat state, steel plate support roll position adjusting for controlling a predetermined position of the steel plate in up and down directions while supporting the steel plate, and laser irradiating for irradiating a laser beam to melt the steel plate to form a groove in a surface of the steel plate.

Abstract: Provided is an authentication service system and authentication service method. According to embodiments of the present disclosure, when a plurality of authentication processes are performed using different authentication factors, an access token is issued based on an authentication factor used in a previous authentication process; and a subsequent authentication process is performed according to validity of the access token issued in the previous authentication process.

Abstract: A system and method for authentication are provided. The system for authentication according to one embodiment of the present disclosure includes: a service server configured to: receive a first authentication request message from an authentication server and convert a random number included in the first authentication request message into an optical code; a first user terminal configured to receive the optical code from the service server and display the optical code; and a second user terminal configured to: recognize the random number by capturing an image of the displayed optical code in response to receiving a second authentication request message from the service server and authenticate a user by using the random number, the second authentication request message, and biometric information of the user.

Abstract: A device according to an embodiment of the present invention for detecting an internal flaw in a steel plate by using a height-adjustable ultrasonic sensor may comprise: a spray nozzle installed a certain distance apart from the bottom of a steel plate, for spraying a medium toward the steel plate and forming a medium column; an ultrasonic sensor installed inside the spray nozzle, for transmitting and receiving ultrasonic waves for detecting flaws in the steel plate through the medium column; a flaw detecting unit for detecting the presence of internal flaws in the steel plate on the basis of the transmitted and received ultrasonic waves; and a driving unit installed inside the spray nozzle, for adjusting the distance between the ultrasonic sensor and the steel plate according to the thickness of the steel plate.

Abstract: The present invention relates to a method for analyzing single nucleotide polymorphism (SNP) of mitochondrial DNA (mtDNA) using a peptide nucleic acid (PNA) probe and a melting curve analysis and more particularly, to a method for analyzing SNP of mtDNA by the melting curve analysis of a PNA probe and mtDNA using the PNA probe coupled with a reporter and a quencher. According to the present invention, the method for analyzing SNP of mtDNA uses PNA probes labeled with the reporter and the quencher so that time and cost required for individual identification can be drastically decreased, initial analysis can be carried out in the event of a large number of inspections or mass casualties, and human identification information can be coded, and thus it is very easy to manage and supervise the same.

Abstract: An operating method performed by a storage device includes selecting a first task from among a plurality of tasks queuing in a command queue of the storage device, checking a first block to be accessed by the first task using a mapping table loaded to the storage device, determining whether the first block is a read reclaim target or a replacement target, and determining an order of executing the first task depending on whether the first block is the read reclaim target or the replacement target.

Abstract: A method of operating a storage device includes receiving a write task from a host device. The method also includes storing the write task in a task queue included in the storage device. A write execution command is received from the host device. The method includes executing the write task in response to the write execution command and performing an internal management operation of the storage device after the write task is stored in the task queue and before the write execution command is received.

Abstract: Provided is an oriented electrical steel sheet including a groove existing on the surface of the electrical steel sheet and a forsterite layer formed on a part or all of the surface of the electrical steel sheet, in which forsterite which is extended from the forsterite layer and penetrates to a base steel sheet in an anchor form is present on the surface of the side of the groove.

Abstract: Disclosed herein are a method and a device for forming a groove in a surface of a steel sheet. In the method for forming a groove in a surface of a steel sheet, in order to form grooves at a depth of 10% or less of a thickness of the steel sheet in the surface of the steel sheet by irradiating a laser beam, in the case in which laser beams are irradiated from a plurality of laser oscillators to a scan mirror, pass through the scan mirror, and are then irradiated to the surface of the steel sheet, two or more laser beams share one scan mirror with each other to minimize a thermal influence of groove portions at a high line speed of 20 mpm or more, thereby accomplishing iron loss improvement characteristics before (after) heat treatment.

Abstract: A unit cell pack according to the present disclosure includes a first battery module including battery cartridges that are sequentially stacked, a plurality of batteries wherein two batteries are seated on an upper surface of each of the battery cartridges, electrode connection members respectively positioned on both sides of the battery cartridges, and a battery cover covering the battery cartridges, the plurality of batteries, and the electrode connection members; a second battery module being adjacent to the first battery module and including same constituent elements as the first battery module; a battery housing surrounding the first battery module and the second battery module, and including air inflow window covers and air outflow window covers facing each other; and a fan duct disposed on the air outflow window covers of the battery housing, in which the two batteries on the upper surface of each of the battery cartridges are electrically connected in parallel, the battery cartridges are electrically

Abstract: The present invention relates to a method for preparing graphene using a spontaneous process, and particularly, to a method for mass-producing high-quality graphene composed of a single layer or several layers by using lithium intercalation of a graphite electrode occurring during the process of charging a lithium ion battery and a lithium ion capacitor in the preparation of graphene to form a graphite intercalation compound, and performing exfoliation through a reaction with water (or alcohol).

Abstract: Disclosed herein is a battery module configured to have a structure in which two or more unit cells are fixed to a cartridge and a plurality of cartridges is stacked, the battery module including unit cells having electrode terminals formed at one side thereof, cartridges for fixing the unit cells, and bus bars coupled with the electrode terminals for electrically connecting the unit cells with each other, wherein the unit cells are mounted to the cartridges such that the electrode terminals of the unit cells face each other in a state in which the unit cells are arranged in a line such that side surfaces of the unit cells are parallel to the ground, and the electrode terminals facing each other are connected to each other in parallel by the bus bars mounted to the cartridges to form a parallel unit cell connection structure for each of the cartridges, and the cartridges are stacked such that a plurality of parallel unit cell connection structures is arranged from the ground in a height direction.

Abstract: The present invention relates to a method for preparing graphene using a spontaneous process, and particularly, to a method for mass-producing high-quality graphene composed of a single layer or several layers by using lithium intercalation of a graphite electrode occurring during the process of charging a lithium ion battery and a lithium ion capacitor in the preparation of graphene to form a graphite intercalation compound, and performing exfoliation through a reaction with water (or alcohol).

Abstract: A method for manufacturing an electrical steel sheet is provided. The method for manufacturing an electrical steel sheet includes forming a groove having first and second side surfaces and a bottom surface by melting a surface of a steel sheet by laser irradiation, and forming an opening by removing melted byproducts of the steel sheet formed on the first and second side surfaces and the bottom surface through air blowing or suctioning to expose at least one surface of the first side surface, the second side surface, and the bottom surface in the forming of the groove.

Abstract: A storage device includes a data storage having first and second storage areas corresponding to different physical addresses. First data are stored in the first storage area. The storage device further includes a first memory that stores a reference count associated with the first data, and a controller that rearranges the first data from the first storage area to the second storage area in response to a change in the reference count of the first data.

Abstract: A method for fabricating a 3D (three-dimensional) structure is disclosed to provide hydrophobicity to a surface of a 3D structure by using a dipping method in which a predetermined-shaped structure is immersed in a molten metal solution. The method includes: immersing a predetermined-shaped structure in a molten metal solution to coat a molten metal material on the surface of the predetermined-shaped structure; anodizing a metal base coated with the molten metal material; coating a polymer material on an outer surface of the metal-coated base to form a negative replica structure; covering an outer surface of the negative replica structure with an outer formation material; and removing the metal-coated base from the negative replica structure and the outer formation material.

Abstract: Disclosed herein is a middle or large-sized battery module having secondary batteries or unit modules, each of which has two or more secondary batteries mounted therein, stacked in a state in which the secondary batteries or the unit modules are erected vertically, the battery module including a base plate on which the secondary batteries or the unit modules are stacked in a vertically erected state, a pair of end plates disposed in tight contact with outer sides of the outermost unit modules or the outermost unit modules in a state in which the bottom of each of the end plates is fixed to the base plate, and supporting bars connected between opposite sides of upper parts or side parts of the end plates so as to interconnect and support the end plates, wherein the base plate is provided at opposite sides thereof with a pair of upward protrusions extending in a longitudinal direction of the base plate to prevent the base plate from being deformed due to vertical vibration and to disperse pressure (load), and o

Abstract: A method of processing data in a storage device includes writing first data to a data storage unit of the storage device upon receiving the first data from an external host of the storage device, outputting a message to the external host indicating completion of writing the first data to the data storage unit, and determining whether a first data unit included in the first data is redundant in the data storage unit. Determining whether the first data unit is redundant is performed subsequent to or in parallel with writing the first data to the data storage unit.

Abstract: The present invention relates to a method for manufacturing a solid body having a superhydrophobic surface structure formed by using a surface treatment of a metal body, a replication process, and a polymer sticking phenomenon to increase efficiency of fluid transfer and prevent foreign materials from being accumulated in the tube, and a superhydrophobic fluid transfer tube using the method. The superhydrophobic fluid transfer tube includes a fluid guider and a solid body provided on a fluid contact surface of the fluid guider and has micrometer-scaled unevenness and nanometer-scaled protrusions.