Abstract: The present invention relates to a parcel sorting system which is operated using two separate tracks so as to distinguish between concentrated population areas and other areas, and feed and sort only parcels destined for a corresponding area, whereby parcel sorting can be efficiently performed, and the system can be efficiently constructed while occupying a small area.

Abstract: The present disclosure relates to a portable protective device for preventing respiratory viruses, which is characterized in that a face shield can be worn in close contact with the user's face to prevent the user's eyes and respiratory organs from being exposed to the outside, whereby it is possible to prevent permeation of contaminated air by supplying purified air through an air purifier, and to enable a user to take drink, etc. while minimizing exposure to respiratory viruses because an insertion port for inserting a straw to enable the user to take drink such as coffee is provided.

Abstract: The present invention relates to a video-based integrated building construction and maintenance management method in which a series of processes of building construction and maintenance after the completion of the construction is produced as a video and registered in a building management server, and this video is configured to be checked by a building owner or resident so that a building can be transparently managed by fundamentally preventing faulty construction that may occur during a construction step and untrustworthy maintenance, and thus a sense of trust may be given to the building owner or resident.