Abstract: An air cleaner includes a housing including a first opening configured to absorb outside air, a second opening configured to discharge the air outside, and a housing body having an internal flow path connecting the first opening and the second opening, a blower unit including a blowing fan configured to blow air accommodated in the internal flow path toward the second opening, and a driving motor disposed between the first opening and the blowing fan and detachably shaft-coupled to the blowing fan, and installed in the internal flow path, a filter installed in the internal flow path and configured to purify air absorbed through the first opening, and a discharge unit including a discharge grille having a plurality of discharge holes formed to allow air reaching the second opening to pass therethrough and detachably coupled to the second opening.

Abstract: An apparatus and method for managing three-dimensional (3D) printing. The method includes receiving a video of a product being output from a 3D printer, acquiring first output information by comparing a first frame of the video and a second frame subsequent to the first frame, acquiring second output information by extracting output layer-specific trace information from a G-code of the product being output acquired from the 3D printer, and acquiring quality information of the product being output on the basis of the first output information and the second output information.

Abstract: Provided is an air cleaner including a body; a cover having an intake hole configured to take air in the body; and a detachable member provided to the body and the cover, and configured to detachably apply the cover relative to the body. The detachable member includes a first detachable element provided to the cover; and a second detachable element provided to the body and configured to be detachable with the first detachable element by a magnetic force.

Abstract: Provided is an apparatus for receiving an unmanned mail capable of automatically acquiring the address information even though the user does not directly input the address information. The apparatus acquires address information of an addressee by automatically recognizing the address of the mail when the address is written on the mail, and acquires the address information of the addressee through the paper on which the address is printed or written, identification, and biometric recognition when the address is not written on the mail. The apparatus may acquire the address information of the addressee through a mail sender's voice.