−90−80−70−60−50−40−300.5123456789101112Ta g 21
Ta g 22
Ta g 23(m)Figure 7: Average value of signal strength sent by three tags and measured within different ranges.RFID readerRecovery roomR 5R 4 R 3 R 2 R 1R 6R 7R 8R 9 R^10Front
doorNursing
centerTr a n s f e r
roomWaiting
roomRecovery roomPlastercastElevatorPatient enterSidewalksidewalkSidewalkSidewalkSidewalkSidewalkSidewalkSidewalk SidewalkSidewalkNonreaction areaR (^11) R 12
R 15
R 13 R^14
Sidewalk reader
54.35m
49.25
m
Figure 8: A simulated installation of RFID readers with 6-meters distance between two readers in the surgery room.