Patent ID: 11947029
Assignee: KOREA INSTITUTE OF ENERGY RESEARCH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A method for detecting occupants in a system for detecting occupants, the system including a first beacon, a second beacon, and a device for detecting occupants, wherein the method comprises:
a first transmission operation of transmitting a 1-1 signal and a 2-1 signal, having a first transmission strength, respectively from the first beacon and the second beacon, which are installed in a first space partitioned by a bulkhead in a building;
a second transmission operation of transmitting a 1-2 signal and a 2-2 signal, having a second transmission strength, respectively from the first beacon and the second beacon;
a vector calculation operation in which, when 1-1 reception strength information for the 1-1 signal, 1-2 reception strength information for the 1-2 signal, 2-1 reception strength information for the 2-1 signal, and 2-2 reception strength information for the 2-2 signal are measured in a communication terminal receiving signals from the first beacon and the second beacon, the device for detecting occupants calculates a first vector using the 1-1 reception strength information and the 2-1 reception strength information corresponding to the first transmission strength and calculates a second vector using the 1-2 reception strength information and the 2-2 reception strength information corresponding to the second transmission strength; and
an occupant detection operation in which the device for detecting occupants estimates whether the communication terminal is located in the first space and detects a number of occupants in the first space by comparing cosine similarity for the first vector and the second vector with a preset reference value,
wherein, in the occupant detection operation, the device for detecting occupants increases the number of occupants in the first space by 1 when the cosine similarity is greater than or equal to the reference value, and
wherein, after the occupant detection operation, the method further comprises an air conditioning control operation in which the device for detecting occupants adjusts at least one condition among a wind speed, a wind direction, a temperature, and a humidity of an air conditioning device installed in the first space according to the number of occupants in the first space.