The local system consists of a presence sensor network
(infrared sensors) judiciously distributed in the patient's room
and wirelessly connected to a centralized supervisory computer
in the local nurse. This computer includes algorithms for
monitoring and diagnostics via a specially developed interface.
The nurse can see the movements of the patient in real time and
obtain the location of alarms. She validates the alarms and can
connect with the physician through the computer that is directly
connected to Internet network via a high-speed satellite
communication.
To locate precisely the subject in his living room, one
sensor, placed on the ceiling, by area is used as illustrated in
Fig. 2. Zones are defined to focus on the bed, around the bed,
in the bathroom, as well as those where the person is staying
long (chair, table, etc.). Each area dimension represents about 1
to 2 m2 coverage. We take care not to make overlapping
between the coverage areas of sensors. However, two sensors
can detect in the same time when the subject moves or tends
The local system consists of a presence sensor network(infrared sensors) judiciously distributed in the patient's roomand wirelessly connected to a centralized supervisory computerin the local nurse. This computer includes algorithms formonitoring and diagnostics via a specially developed interface.The nurse can see the movements of the patient in real time andobtain the location of alarms. She validates the alarms and canconnect with the physician through the computer that is directlyconnected to Internet network via a high-speed satellitecommunication.To locate precisely the subject in his living room, onesensor, placed on the ceiling, by area is used as illustrated inFig. 2. Zones are defined to focus on the bed, around the bed,in the bathroom, as well as those where the person is stayinglong (chair, table, etc.). Each area dimension represents about 1to 2 m2 coverage. We take care not to make overlappingbetween the coverage areas of sensors. However, two sensorscan detect in the same time when the subject moves or tends
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