Abstract: A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer satisfying a specific formula formed on the cathode current collector. The cathode active material layer includes lithium metal oxide particles that have a single particle shape, and a single crystalline structure or a poly-crystalline structure including two or more single crystals. A lithium secondary battery including the cathode, and a method of preparing a cathode active material are also provided.

Abstract: Provided are a method of detecting chromosomal aneuploidy of a targeted fetal chromosome, and a computer-readable medium having recorded thereon a program to be applied to performing the method. According to the present disclosure, fetal chromosomal aneuploidy may be non-invasively and prenatally diagnosed with excellent sensitivity and specificity.

Abstract: Provided is a boil-off gas compressor for LNG-fueled vessels using LNG as fuel for a propulsion engine thereof. The boil-off gas compressor includes: compressor housings in which impellers are rotatably arranged; a motor housing in which a motor is disposed to drive the impellers; and a bearing for rotatably supporting rotation shafts, which transfer rotation drive force of the motor to the impellers. The compressor housings may be integrally formed with the motor housing.

Abstract: A battery module may effectively cool the plurality of battery cells by using the heat sink. The battery module includes an outer case having an accommodation space therein; an inner case having a storage space therein, the inner case being in the accommodation space; a plurality of battery cells in the storage space; a heat sink in the accommodation space with the heat sink being between the inner case and one side wall of the outer case and configured to cool the battery cells; and a pressing part in the accommodation space and having at least a portion between the other side wall of the outer case, which is opposite to the one side wall, and the inner case. The pressing part is configured to press the inner case toward the heat sink.

Abstract: A method and system for providing secure data communication between two or more user terminals in a communication network is proposed. The method may include receiving, from a first user terminal, a first instruction set configured to request that a private account be converted into a group account, the private account owned by a user of the first user terminal. The method may also include generating the group account jointly owned by at least the user of the first user terminal and a user of a second user terminal. The method may also include controlling a first database to store a second information set relating to the group account, and generating a second virtual database different from the first database. The method may also include copying the second information set stored in the first database and recording the copied second information set in the second virtual database.

Abstract: A user terminal including a graphical user interface (GUI) for providing secure data communication with a server in a communication network is proposed. The user terminal may include a GUI configured to receive one or more user inputs and display data received from the server. The GUI may include a first screen configured to display a first instruction set for converting a private account to a group account and a second screen configured to display a group account information set received from the server. The user terminal may cause the server to generate the group account, control a first database of the server to store a second information set relating to the group account, generate a second virtual database of the server different from the first database, and copy the second information set stored in the first database and record the copied second information set in the second virtual database.

Abstract: Provided is a compound of Chemical Formula 1: wherein: L1 and L2 are the same as or different from each other, and are each independently an arylene group which is unsubstituted or substituted with an aryl group, Ar1 and Ar2 are the same as or different from each other, and are each independently the following Chemical Formula A, where X1 is N or CR1, X2 is N or CR2, X3 is N or CR3, X4 is N or CR4, and X5 is N or CR5, at least two of X1 to X5 are N, and the other substituents are as defined in the specification, and an organic light emitting device including the same. The organic light emitting device including the compound of Chemical Formula 1 exhibits remarkably excellent characteristics in terms of voltage, efficiency and service life.

Abstract: Various perovskite solar cell embodiments include a flexible metal substrate (e.g., including a metal doped TiO2 layer), a perovskite layer, and a transparent electrode layer (e.g., including a dielectric/metal/dielectric structure), wherein the perovskite layer is provided between the flexible metal substrate and the transparent electrode layer. Also, various tandem solar cell embodiments including a perovskite solar cell and either a quantum dot solar cell, and organic solar cell or a thin film solar cell.

Abstract: A transformer includes: an upper primary substrate (110) which is formed by stacking a plurality of dielectric substrates, each substrate being provided with spiral conductive patterns; a lower secondary substrate (120) which is formed by stacking a plurality of dielectric substrates, each substrate being provided with spiral conductive patterns, in which the lower secondary substrate is positioned below the upper primary substrate (110) in such a way that the lower secondary substrate comes into contact with the upper primary substrate (110) or is spaced apart from the upper primary substrate (110); and a secondary coil element (200) of a planar shape to produce an induced current by a current applied to the upper primary substrate (110) and the lower primary substrate (120).

Abstract: The present application relates to a composition for freeze-preserving microalgae belonging to the family Thraustochytriaceae and a method for freeze-preserving microalgae belonging to the family Thraustochytriaceae using same. By the composition for freeze-preserving microalgae belonging to the family Thraustochytriaceae according to an aspect and the method for freeze-preserving microalgae belonging to the family Thraustochytriaceae using same, the microalgae may be stored stably for a long period of time, and the costs for preservation of the microalgae may be reduced by shortening a process. In addition, according to a method for preparing freeze-dried biomass of microalgae belonging to the family Thraustochytriaceae using the composition, even during long-term storage at room temperature, freeze-dried biomass in the form of powder that can maintain bacterial activity and is easy for storage and transportation may be manufactured through a simple process.

Abstract: A rebreathing apparatus having inhaled oxygen mixing and exhaled carbon dioxide removal functions, enabling rebreathing by maintaining the amount of breathing oxygen by inhalation and removing carbon dioxide discharged by exhalation. The rebreathing apparatus includes a mask having one side to which an inhalation hose is connected and the other side to which an exhalation hose is connected; an exhaled breath storing container storing exhaled breath; a filter removing carbon dioxide; an inhaled breath storing container storing the air having passed through the filter; an oxygen storing container supplying oxygen to the inhalation storing container; a decompressor installed at an inlet of the oxygen storing container; an oxygen mixing module mixing the oxygen discharged through the oxygen supplying hose with the air; and a controller controlling operations of the exhaled breath storing container, the inhaled breath storing container, the oxygen storing container, the filter, and the oxygen mixing module.

Abstract: A cathode composition for a lithium secondary battery includes a cathode active material including cathode active material particles having a single particle shape, flake graphite, and a conductive material including an amorphous carbon-based conductive material.

Abstract: Various perovskite solar cell embodiments include a flexible metal substrate (e.g., including a metal doped TiO2 layer), a perovskite layer, and a transparent electrode layer (e.g., including a dielectric/metal/dielectric structure), wherein the perovskite layer is provided between the flexible metal substrate and the transparent electrode layer. Also, various tandem solar cell embodiments including a perovskite solar cell and either a quantum dot solar cell, and organic solar cell or a thin film solar cell.

Abstract: A methane cracking apparatus includes a supply pipeline that supplies a gas, a reactor having an interior space, and in which a catalyst for decomposing the gas may be disposed in the interior space, an agitator provided in the interior space and that agitates a material in the interior space, a first discharge pipeline connected to the reactor and that discharges decomposition materials generated as the gas may be decomposed, and a second discharge pipeline connected to the reactor, that discharges the decomposition materials, and disposed on an upper side of the first discharge pipeline.

Abstract: Provided is a method for transmitting paging information in a cellular system. An object of the method is transmitting paging information which can improve applicability of a limited radio resource by variably and flexibly setting up and mapping a transport channel and a physical channel in order to transmit information notifying start of downlink information from a base station to a terminal in a cellular system for packet transmission. The method includes the steps of: forming a paging channel (PCH) in a transport channel corresponding to generation of paging information; setting a paging indication channel (PICH) based on the paging information and forming the paging indication channel in a radio resource of a physical layer; and allocating the paging channel to the radio resource of the physical layer.

Abstract: Disclosed is a catalyst complex for a fuel cell. The catalyst complex includes a support including carbon (C), platinum (Pt) supported on the support, and an iridium (Ir) compound supported on the support, and the iridium compound includes at least one of iridium oxide represented by Chemical Formula 1, IrOx, and iridium-transition-metal oxide represented by Chemical Formula 2, IrMOx, wherein M is a transition metal selected from the group consisting of Fe, Co, Cu, Ni and combinations thereof, and x is from 1 to 2.

Abstract: Provided are a method of detecting chromosomal aneuploidy of a targeted fetal chromosome, and a computer-readable medium having recorded thereon a program to be applied to performing the method. According to the present disclosure, fetal chromosomal aneuploidy may be non-invasively and prenatally diagnosed with excellent sensitivity and specificity.

Abstract: The present invention relates to a A preamble allocation method and a random access method in a mobile communication system. In the present invention, includes allocating one among preamble resources is allocated to a specific mobile stations station in advance, before random access. The mobile stations request station requests random access by transmitting a preamble based on the pre-allocated preamble resource to a base station. It is therefore possible to prevent A collision caused by the fact that other mobile stations transmit the same preamble the same preamble transmission by another mobile station may be prevented.