Abstract: An organic zinc catalyst and a preparation method thereof are provided. According to the present invention, the organic zinc catalyst has a smaller thickness and a larger surface area to exhibit more improved activity in polymerization for the preparation of a poly(alkylene carbonate) resin.

Abstract: The present invention relates to a manufacturing method of an organic zinc catalyst having more uniform and finer particle size and showing a more improved activity in a polymerization process for manufacturing a polyalkylene carbonate resin, and a manufacturing method of the polyalkylene carbonate resin using the organic zinc catalyst obtained by the manufacturing method of the organic zinc catalyst, the manufacturing method of an organic zinc catalyst including: forming a zinc dicarboxylate-based catalyst by reacting a zinc precursor with C3-C20 dicarboxylic acid, wherein the reaction step is performed under a condition in which the number of moles of the dicarboxylic acid is more than that of the zinc precursor in a reaction system, throughout the entire reaction step.

Abstract: The present invention relates to a manufacturing method of a polyalkylene carbonate resin capable of suppressing agglomeration among catalyst particles during polymerization to maintain an excellent catalytic activity in a polymerization process, wherein the manufacturing method of a polyalkylene carbonate resin may include polymerizing epoxide and a monomer including carbon dioxide in the presence of a zinc dicarboxylate-based organic zinc catalyst and a dispersant, and the dispersant may include at least one selected from the group consisting of C1-C10 alkyl acrylate, C1-C10 alkyl methacrylate, C1-C20 monocarboxylic acid having an oxo group in a molecular structure, and a polyether-based polymer having C2-C6 alkylene oxide repeating units.

Abstract: CRT-RSA encryption methods and apparatuses are disclosed. The CRT-RSA encryption method includes: calculating first parameter information and second parameter information used in a modular exponential calculation process based on a modular calculation result of a secret key that is obtained using Euler's phi function with respect to two different prime numbers calculated from the public key; performing a modular exponential calculation with respect to a next block based on calculation information of a previous block, in a block unit divided respectively from the first parameter information and the second parameter information; and calculating an encryption process based on a CRT calculation by using the modular exponential calculation results.

Abstract: An organic zinc catalyst having more uniform and fine particle size and showing more improved activity in a polymerization process for the preparation of a poly(alkylene carbonate) resin and a preparation method thereof, and a method of preparing a poly(alkylene carbonate) resin using the organic zinc catalyst, are provided. The preparation method of the organic zinc catalyst includes the steps of surface-treating a zinc precursor with a dispersant, and reacting the surface-treated zinc precursor with dicarboxylic acid to form a zinc dicarboxylate-based catalyst.

Abstract: Provided is a multi-operating switch unit for vehicles including: a housing part; a substrate; a switch shaft part; a rotary switch part; a directional switch part; and a push switch part. The directional switch part has: a directional slide part in which the position thereof can vary in the housing part due to a tilting directional operation of the switch shaft part; a directional switch that is arranged on the substrate and is operated due to the positional variation of the directional slide part; and a directional return part that returns the directional slide part and the switch shaft part. The directional return part has a return plunger; a return elastic part; and a return groove. The return plunger can be movable in the axial length direction of the switch shaft part with respect to the housing part, and the return groove is formed in the directional slide part.

Abstract: The present invention relates to a manufacturing method of a polyalkylene carbonate resin capable of suppressing agglomeration among catalyst particles during polymerization to maintain an excellent catalytic activity in a polymerization process, wherein the manufacturing method of a polyalkylene carbonate resin may include polymerizing epoxide and a monomer including carbon dioxide in the presence of a zinc dicarboxylate-based organic zinc catalyst and a dispersant, and the dispersant may include at least one selected from the group consisting of C1-C10 alkyl acrylate, C1-C10 alkyl methacrylate, C1-C20 monocarboxylic acid having an oxo group in a molecular structure, and a polyether-based polymer having C2-C6 alkylene oxide repeating units.

Abstract: The present invention relates to an organic zinc catalyst suppressing agglomeration among catalyst particles during a manufacturing method to have more uniform and finer particle size, thereby showing a more improved activity in a polymerization process for manufacturing a polyalkylene carbonate resin, a manufacturing method thereof, and a manufacturing method of a polyalkylene carbonate resin using the same, wherein the organic zinc catalyst is a zinc dicarboxylate-based organic zinc catalyst used for a reaction in which a polyalkylene carbonate resin is manufactured from carbon dioxide and epoxide and includes a monocarboxylic acid-derived moiety having a C3-C15 aliphatic hydrocarbon group (provided that at least one oxygen or carbonyl group is included or not included in the aliphatic hydrocarbon group) that is bonded to an end of at least one side of the zinc dicarboxylate-based organic zinc catalyst.

Abstract: An organic zinc catalyst and a preparation method thereof are provided. According to the present invention, the organic zinc catalyst has a smaller thickness and a larger surface area to exhibit more improved activity in polymerization for the preparation of a poly(alkylene carbonate) resin.

Abstract: The present invention relates to a manufacturing method of an organic zinc catalyst having more uniform and finer particle size and showing a more improved activity in a polymerization process for manufacturing a polyalkylene carbonate resin, and a manufacturing method of the polyalkylene carbonate resin using the organic zinc catalyst obtained by the manufacturing method of the organic zinc catalyst, the manufacturing method of an organic zinc catalyst including: forming a zinc dicarboxylate-based catalyst by reacting a zinc precursor with C3-C20 dicarboxylic acid, wherein the reaction step is performed under a condition in which the number of moles of the dicarboxylic acid is more than that of the zinc precursor in a reaction system, throughout the entire reaction step.

Abstract: Provided is a refrigerator including a main body providing a storage, a dispenser provided to the main body and configured to dispense water or ice, an operable operation part provided to the dispenser, and a dispenser motor driven according to operating the operation part, wherein the dispenser motor includes, a stator generating a magnetic field, a rotator rotatable by the magnetic field, and a compression member applying a frictional force to the rotator while rotation of the rotator is stopped. The dispensing of water or ice is quickly stopped by stopping the operating of the operation part.

Abstract: Provided is a refrigerator including a main body providing a storage, a dispenser provided to the main body and configured to dispense water or ice, an operable operation part provided to the dispenser, and a dispenser motor driven according to operating the operation part, wherein the dispenser motor includes, a stator generating a magnetic field, a rotator rotatable by the magnetic field, and a compression member applying a frictional force to the rotator while rotation of the rotator is stopped. The dispensing of water or ice is quickly stopped by stopping the operating of the operation part.

Abstract: Embodiments relates to a refrigerator that makes it possible to improve water supply performance by disposing an air exhaust unit in a water supply channel connected to the output side of a pump supplying water from a water tank to an ice maker or a dispenser, and effectively return water remaining when the use of dispenser is finished, by using an opening/closing member in the water supply channel, and a water tank for a refrigerator.

Abstract: The present invention relates to a preparation method of an organic zinc catalyst capable of preparing an organic zinc catalyst having a finer and more uniform particle size and more improved activity during a polymerization process for preparing a poly(alkylene carbonate) resin, and a preparation method of a poly(alkylene carbonate) resin using the organic zinc catalyst. The preparation method of an organic zinc catalyst includes reacting a zinc precursor and a dicarboxylic acid in the presence of a dispersant to form a zinc dicarboxylate-based catalyst, wherein a reaction step is performed under a condition at which the number of moles of the dicarboxylic acid present in a reaction system is larger than that of the zinc precursor throughout the entire reaction step.

Abstract: Provided is a multi-operating switch unit for vehicles including: a housing part; a substrate; a switch shaft part; a rotary switch part; a directional switch part; and a push switch part. The directional switch part has: a directional slide part in which the position thereof can vary in the housing part due to a tilting directional operation of the switch shaft part; a directional switch that is arranged on the substrate and is operated due to the positional variation of the directional slide part; and a directional return part that returns the directional slide part and the switch shaft part. The directional return part has a return plunger; a return elastic part; and a return groove. The return plunger can be movable in the axial length direction of the switch shaft part with respect to the housing part, and the return groove is formed in the directional slide part.

Abstract: CRT-RSA encryption methods and apparatuses are disclosed. The CRT-RSA encryption method includes: calculating first parameter information and second parameter information used in a modular exponential calculation process based on a modular calculation result of a secret key that is obtained using Euler's phi function with respect to two different prime numbers calculated from the public key; performing a modular exponential calculation with respect to a next block based on calculation information of a previous block, in a block unit divided respectively from the first parameter information and the second parameter information; and calculating an encryption process based on a CRT calculation by using the modular exponential calculation results.

Abstract: Provided are a refrigerator and a control method thereof. Various sized mineral water bottles that is generally available everywhere may be used as a water supply container. When water lack state occurs in a water supply process, a water supplement signal is outputted to allow a user to detect the water lack state, as well as, the user can quickly and easily replace the water supply container.

Abstract: A refrigerator is provided. The refrigerator includes a body defining a storage space; a door selectively shielding the storage space; a container connecting part disposed in the storage space or the door; a water supply container separably coupled to the container connecting part, the water supply container including an opening for injecting water; an ice making device for making ice using the water supplied from the water supply container; a water supply passage fluidly connecting the water supply container to the ice making device, the water supply passage extending in an inside direction of the water supply container; and a pump connected to the water supply passage to supply the water within the water supply container into the ice making device. According to the refrigerator, installation cost is reduced, and quality and reliability are improved.

Abstract: A refrigerator is provided. The refrigerator includes a body defining a storage space; a door selectively shielding the storage space; a container connecting part disposed in the storage space or the door; a water supply container separably coupled to the container connecting part, the water supply container including an opening for injecting water; an ice making device for making ice using the water supplied from the water supply container; a water supply passage fluidly connecting the water supply container to the ice making device, the water supply passage extending in an inside direction of the water supply container; and a pump connected to the water supply passage to supply the water within the water supply container into the ice making device. According to the refrigerator, installation cost is reduced, and quality and reliability are improved.

Abstract: Embodiments relates to a refrigerator that makes it possible to improve water supply performance by disposing an air exhaust unit in a water supply channel connected to the output side of a pump supplying water from a water tank to an ice maker or a dispenser, and effectively return water remaining when the use of dispenser is finished, by using an opening/closing member in the water supply channel, and a water tank for a refrigerator.