Abstract: A method of reducing a concentration of a nitrogen oxide, the method comprising: contacting a microorganism with a nitrogen oxide-containing sample to reduce the concentration of the nitrogen oxide in the sample, wherein the contacting comprises contacting the microorganism with Fe(II)(L)-NOx in a bioreactor, wherein the Fe(II)(L)-NOx is a complex in which a chelating agent, Fe2+, and NOx are chelated, wherein L is the chelating agent, and wherein NOx is a nitrogen oxide ligand.

Abstract: The present invention includes: a voice sensor for detecting voice information; a camera for capturing an image of a subject related to the voice information; and a control unit for controlling the camera such that the image of the subject related to the voice information is captured when the voice sensor detects the voice information, and determining, by using the captured image of the subject and the voice information, whether the subject related to the voice information is a counterfeit face, thereby determining whether to execute a control command corresponding to the voice information.

Abstract: The present invention includes: a voice sensor for detecting voice information; a camera for capturing an image of a subject related to the voice information; and a control unit for controlling the camera such that the image of the subject related to the voice information is captured when the voice sensor detects the voice information, and determining, by using the captured image of the subject and the voice information, whether the subject related to the voice information is a counterfeit face, thereby determining whether to execute a control command corresponding to the voice information.

Abstract: The present invention relates to digital signage comprising a large display part for outputting visual information. The digital signature comprises: a display part extending in one direction and formed in a bar shape; a sensing part, which is positioned in a region adjacent to the display part and detects at least one group; and a control part for dividing the display part into a plurality of regions such that the regions of the display parts are assigned to each of the at least one group, and controlling the display part such that visual information related to the at least one group is outputted to the region adjacent to the at least one group among the plurality of regions, wherein the control part divides the display part such that the region adjacent to the at least one group has a width corresponding to the width of the space occupied by the at least one group.