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.

Abstract: The present invention relates to a condensing heat exchanger and a boiler/water heater including the same and, more particularly, to a condensing heat exchanger, which can increase a contact area between water and a combustion gas having high temperature and improve efficiency by passing a combustion gas, generated from a combustion chamber, through a plurality of exhaust pipes and which can be fabricated in a small and compact size, and a boiler/water heater including the same.

Abstract: A premix combustion device of a gas burner applicable to a domestic gas boiler or water heater, includes a gas mixture supply pipe to supply gas mixture to the gas burner, and a gas supply and an air supply connected with the gas mixture supply pipe. A damper is provided at a predetermined position in the gas mixture supply pipe to regulate the amount of the gas mixture to be supplied to the gas burner, the degree of opening of the damper is adjusted by an electrically operated valve controlled by a control signal from a controller, and a valve disc arranged to open and close the gas mixture supply pipe according to operation of the valve is provided with a plurality of holes.

Abstract: The present invention relates to an incinerator devised to incinerate various kinds of wastes including medical and food wastes. Up to this time, the waste containing an explosive chemical substance like alcohol or the waste containing water in large quantities has been disposed of unsanitarily, requiring a great deal of labor and cost. The present invention is equipped with a primary combustion chamber, a secondary combustion chamber, a communicating means which introudces gases to the secondary combustion chamber from the primary combustion chamber, an exhaust means which discharges waste gas from the secondary combustion chamber and a microwave generation means. It is an incinerator aimed to solve the above problem by a method wherein waste is incinerated after it is desiccated and pyrolyzed by applying microwaves thereto and explosive gas is disposed of. It is an sanitary incinerator which contains no bad smell, no harmful substance and no smoke in the exhaust gas discharged after incineration.