Abstract: The present disclosure relates to a crystallization method of branched-chain amino acids capable of sustainably cycling ammonia, and branched-chain amino acid crystal produced by the method.

Abstract: A method and a system thereof for producing a digital holographic screen based on multi-hogel printing are proposed. The system includes a light source unit including lasers, a dichroic mirror for RGB three color matching, mirrors, a beam splitter, and an optical shutter, an object beam unit including a spatial filter, a lens, and a mirror, a reference beam unit including a spatial filter, a lens, and a mirror, a diffuser fixing unit including a diffuser holder and a diffuser positioned between the object beam unit and a recording material and configured to scatter and diffuse the object beam, a photomask movement unit including a photomask holder, an XY-translation stage, and a photomask positioned between the reference beam unit and the recording medium and on which a grid-shaped on/off binary pattern is printed, and a controller configured to control the optical shutter and the XY-translation stage.

Abstract: A Merkle tree-based data management method may comprise: aligning data into two-dimensional square matrix; calculating a hash value of each node of the two-dimensional square matrix; calculating hash values of each row of the two-dimensional square matrix; generating an additional column with nodes having the hash values of each row; calculating hash values of each column of the two-dimensional square matrix; generating an additional row with nodes having hash values of each column; and calculating a Merkle root by concatenating the hash values of the additional column and the hash values of the additional row.

Abstract: The present invention relates to a method of manufacturing polycrystalline silicon ingot using a crucible in which an oxygen exhaust passage is formed by single crystal or polycrystalline rods, the method including the steps of: manufacturing the single crystal or polycrystalline silicon rods each having the shape of a quadrilateral pillar; putting the single crystal or polycrystalline quadrilateral pillar-shaped silicon rods into the crucible in such a manner as to be arranged close to one another along the inner peripheral surface of the crucible to thus form a space portion inside the single crystal or polycrystalline silicon rods, into which silicon chunks are put, and the oxygen exhaust passages between the inner peripheral surface of the crucible and the respective surfaces of the single crystal or polycrystalline silicon rods oriented toward the inner peripheral surface of the crucible; putting the silicon chunks into the space portion of the crucible; and melting and crystallizing the silicon chunks.

Abstract: A one touch type auxiliary brake for driving training is disclosed. The auxiliary brake includes: a stick member having a handle at an end thereof and extendedly provided by a distance from a passenger seat to a brake pedal shaft of a driver's seat; and a bracket member formed in a hollow rectangular frame shape so that the brake pedal shaft is positioned therein, wherein a first plane is fixedly coupled to an opposite end of the stick member, a second plane is provided to be inwardly inclined to allow the brake pedal shaft to be slidable into the rectangular frame when the brake pedal shaft is fastened thereto, and a fourth plane adjacent to an inclined end of the second plane is coupled to an elastic hinge to be rotated outward and returned to its original position when the brake pedal shaft is fastened thereto and unfastened therefrom.

Abstract: A one touch type auxiliary brake for driving training is disclosed. The auxiliary brake includes: a stick member having a handle at an end thereof and extendedly provided by a distance from a passenger seat to a brake pedal shaft of a driver's seat; and a bracket member formed in a hollow rectangular frame shape so that the brake pedal shaft is positioned therein, wherein a first plane is fixedly coupled to an opposite end of the stick member, a second plane is provided to be inwardly inclined to allow the brake pedal shaft to be slidable into the rectangular frame when the brake pedal shaft is fastened thereto, and a fourth plane adjacent to an inclined end of the second plane is coupled to an elastic hinge to be rotated outward and returned to its original position when the brake pedal shaft is fastened thereto and unfastened therefrom.

Abstract: The present invention relates to a method and a process of preparing precipitated calcium carbonate of high purity by extracting calcium ion contained in an alkali ion-containing inorganic material such as mineral, steelmaking slag and waste concrete with the use of an acidic aqueous solution, separating other metal ions from the extracted solution, preparing an alkaline earth metal hydroxide using an alkaline aqueous solution and then contacting the same with carbon dioxide.

Abstract: The present invention relates to a method and a process of preparing precipitated calcium carbonate of high purity by extracting calcium ion contained in an alkali ion-containing inorganic material such as mineral, steelmaking slag and waste concrete with the use of an acidic aqueous solution, separating other metal ions from the extracted solution, preparing an alkaline earth metal hydroxide using an alkaline aqueous solution and then contacting the same with carbon dioxide.

Abstract: The present invention relates to a method for preparing a carbonate of an alkali ion using an electrolysis system, more particularly to an improved method for preparing a carbonate of an alkali ion, including eluting an alkali ion from an inorganic material containing the alkali ion and converting the eluted alkali ion to a carbonate, using an electrolysis system which generates an eluting agent and a quick precipitating agent used for the elution of the alkali ion and the conversion to the carbonate at the same time.

Abstract: A method for producing DME, which comprises separating a CO2 rich stream from a crude product stream containing DME and CO2 obtained by a DME synthesis from a feed syn gas; introducing the CO2 rich stream to a reverse water gas shift (RWGS) reactor wherein it is reacted with hydrogen in the presence of an oxide catalyst of either ZnO or NiO to provide a CO rich stream, and recycling the CO rich stream to the step of the methanol synthesis step.

Abstract: The present invention provides a photoelectrochemical (PEC) system for the production of hydrogen from water, which comprises (A) an electrolytic bath comprising an electrode for catalytic oxidation, an electrode for catalytic reduction, an ion separation film disposed between the two electrodes, and an aqueous electrolyte solution into which the two electrodes and the ion separation film are immersed, and (B) a photoelectrode positioned at the outside of the electrolytic bath and electrically connected to the two electrodes. The inventive PEC system is characterized by disposing a photoelectrode at the position which does not contact aqueous electrolyte solution, thus preventing the lowering of the photoelectrode activities, and maximizing the hydrogen production efficiency.

Abstract: A highly efficient desulfurization method for removing a hydrogen sulfide and a sulfur dioxide simultaneously comprises the step of contacting a gas containing the hydrogen sulfide and the sulfur dioxide with water, or an aqueous solution containing a first heterogeneous catalyst for desulfurization to oxidize the hydrogen sulfide with the sulfur dioxide. 3˜5% sulfur-containing tail gas exhausted from, especially, Claus Process can be treated at a high efficiency of over 99%.

Abstract: The present invention is directed to a method for producing DME, which comprises separating a CO2 rich stream from a crude product stream containing DME and CO2 obtained by a DME synthesis from a feed syn gas; introducing the CO2 rich stream to a reverse water gas shift (RWGS) reactor wherein it is reacted with hydrogen in the presence of a catalyst to provide a CO rich stream, and recycling the CO rich stream to the step of the methanol synthesis step. In accordance with the present invention, a large amount of carbon dioxide gas generated during the preparing process of DME is effectively re-used, thus increasing the yield of DME and lowering the amount of carbon dioxide discharged.

Abstract: Malodorous gases such as amines, organosulfur compounds, hydrogen sulfide, styrene and aldehydes are economically and efficiently treated at ambient temperature and pressure by a catalytic absorption and oxidation process comprising: (a) bringing the malodorous gases into contact with a scrubbing water containing a heterogeneous catalyst to absorb the malodorous components catalytically, and (b) subjecting the resulting solution containing the malodorous components to a catalytic oxidation by contacting it with an oxidizing agent such as hydrogen peroxide, ozone, oxygen, air, nitrogen oxides, and NaOCl in the presence of the catalyst at a temperature ranging from 0 to 100 □ under an ambient pressure, the heterogeneous catalyst comprising an active metal element selected from alkali, alkaline earth and transition metals, and an oxide support material.