Abstract: The cryogenic austenitic high-manganese steel having excellent corrosion resistance, according to one aspect of the present invention, comprises 0.2-0.5 wt % of C, 23-28 wt % of Mn, 0.05-0.5 wt % of Si, 0.03 wt % or less of P, 0.005 wt % or less of S, 0.5 wt % or less of Al, and 3-4 wt % of Cr, with the remainder being Fe and other unavoidable impurities, also comprises at least 95 area % of austenite as a microstructure, and has Cr concentration sections continuously formed within an area of 50 ?m in the thickness direction from the surface, wherein the Cr concentration sections comprise a high Cr concentration section having a relatively high concentration of Cr, and a low Cr concentration section having a relatively low concentration of Cr, and the high Cr concentration section may be distributed at 30 area % or less (but not 0%) relative to the whole surface area of the Cr sections.

Abstract: An aspect of the present invention provides: an austenitic high-manganese steel having excellent extreme low temperature toughness in a heat-affected cone; and a method for manufacturing same.

Abstract: According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected zone, and a manufacturing method therefor can be provided.

Abstract: According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected cone, and a manufacturing method therefor can be provided.

Abstract: The inventive concept relates to a chair-type virtual reality controller, wherein the chair-type virtual reality controller includes a seat on which a user is seated, a base on which feet of the user seated on the seat rest, wherein a walking motion of the user is performed on the base; a rotary shaft rotatably coupled to the base such that the seat rotates relative to the base; and a control unit configured to present a VR image to the user based on a rotation motion of a body of the user seated on the seat around the rotary shaft and the walking motion of the user on the base.

Abstract: There is provided an automatic inspection apparatus and method for detecting stains on a polarizing plate using color difference analysis. The automatic inspection apparatus includes an inspection unit including at least one reference polarizing plate and a target polarizing plate or polarizing element mounted on the at least one reference polarizing plate; a light source unit disposed on one surface of the inspection unit and irradiating the inspection unit with light; an imaging unit disposed on the other surface of the inspection unit, imaging the target polarizing plate or polarizing element, and transferring an image thereof; and an arithmetic operation unit performing color difference analysis for individual inspection regions of the image of the target polarizing plate or polarizing element transferred by the imaging unit and detecting a blurred stain.

Abstract: There is provided an automatic inspection apparatus and method for detecting stains on a polarizing plate using color difference analysis. The automatic inspection apparatus includes an inspection unit including at least one reference polarizing plate and a target polarizing plate or polarizing element mounted on the at least one reference polarizing plate; a light source unit disposed on one surface of the inspection unit and irradiating the inspection unit with light; an imaging unit disposed on the other surface of the inspection unit, imaging the target polarizing plate or polarizing element, and transferring an image thereof; and an arithmetic operation unit performing color difference analysis for individual inspection regions of the image of the target polarizing plate or polarizing element transferred by the imaging unit and detecting a blurred stain.

Abstract: An apparatus for manufacturing molten iron by using a calcination furnace, and a manufacturing method therefor are disclosed. A high temperature reducing gas (1000 to 1100° C.) from a melter gasifier is used as a calcination heat in a calcination furnace so as to cool the high temperature reducing gas to the optimum reduction temperature (800 to 850° C.), and so as to supply the cooled reducing gas to a shaft furnace, whereby the manufacture of the molten iron can be efficiently carried out, and a high thermal efficiency is realized even without a separate gas cooling device. Therefore, a separate cooling device for cooling the hot reducing gas of the melter gasifier is not required. Further, the hot reducing gas is naturally cooled at the calcination furnace, and therefore, the thermal efficiency of the hot reducing gas of the melter gasifier is maximized. Further, a separate water-using cooler and a separate compressor are omitted, and therefore, the molten iron manufacturing facility is simplified.

Abstract: A method for injecting fine iron ore in a smelting reducing process is disclosed, in which the carrier gas for the iron ore is the discharge gas from a melter gasifier without the need of separate carrier gas. It includes the steps of pre-reducing iron ore in a pre-reduction furnace, melting and reducing it in the melter gasifier, supplying the discharge gas from the melter gasifier through an ascending tube to a cyclone and to said pre-reduction furnace, directing the cooled and cleaned fine iron ore through a recycling system and a melting burner into the melter gasifier. A part of the discharge gas is supplied through a venturi scrubber, a first compressor and a circulating tube into an ascending tube. A part of the compressed gas circulating through the tube is recompressed by means of a second compressor and fine iron ore from a stored source is injected into ascending the tube by the recompressed gas by means of a pneumatic fine iron ore conveying system.