<s>
A	O
WiTrack	B-Algorithm
is	O
a	O
3-D	O
motion	O
tracking	O
sensor	O
that	O
is	O
capable	O
of	O
monitoring	O
human	O
body	O
movements	O
.	O
</s>
<s>
The	O
WiTrack	B-Algorithm
functions	O
through	O
the	O
use	O
of	O
radio	O
signals	O
,	O
which	O
help	O
perform	O
the	O
task	O
of	O
finding	O
a	O
person	O
's	O
current	O
location	O
,	O
the	O
radio	O
signals	O
not	O
been	O
affected	O
at	O
all	O
by	O
walls	O
and	O
other	O
physical	O
obstacles	O
present	O
.	O
</s>
<s>
WiTrack	B-Algorithm
functions	O
through	O
the	O
use	O
of	O
radio	O
signals	O
that	O
reflect	O
off	O
a	O
person	O
,	O
this	O
does	O
not	O
require	O
a	O
user	O
to	O
hold	O
on	O
to	O
a	O
wireless	O
device	O
like	O
other	O
previous	O
similar	O
inventions	O
.	O
</s>
<s>
WiTrack	B-Algorithm
uses	O
a	O
total	O
of	O
four	O
antennas	O
,	O
one	O
antenna	O
is	O
used	O
for	O
transmitting	O
signals	O
and	O
three	O
antennas	O
are	O
used	O
for	O
receiving	O
the	O
signals	O
.	O
</s>
<s>
WiTrack	B-Algorithm
classifies	O
a	O
fall	O
as	O
a	O
rapid	O
change	O
on	O
the	O
elevation	O
of	O
a	O
person	O
.	O
</s>
<s>
WiTrack	B-Algorithm
can	O
track	O
the	O
motion	O
of	O
a	O
person	O
's	O
arm	O
and	O
detect	O
on	O
what	O
direction	O
the	O
arm	O
is	O
pointing	O
at	O
.	O
</s>
<s>
The	O
WiTrack	B-Algorithm
was	O
well	O
received	O
,	O
this	O
led	O
to	O
the	O
creation	O
of	O
Emerald	O
.	O
</s>
<s>
Emerald	O
was	O
an	O
extension	O
to	O
the	O
WiTrack	B-Algorithm
's	O
ability	O
to	O
track	O
falls	O
among	O
the	O
elderly	O
.	O
</s>
<s>
Just	O
like	O
WiTrack	B-Algorithm
,	O
Emerald	O
tracks	O
the	O
motion	O
of	O
a	O
person	O
through	O
the	O
use	O
of	O
radio	O
signals	O
reflected	O
off	O
the	O
person	O
's	O
body	O
.	O
</s>
<s>
Emerald	O
was	O
presented	O
to	O
President	O
Barack	O
Obama	O
at	O
the	O
White	B-Application
House	I-Application
on	O
August	O
4	O
,	O
2015	O
and	O
was	O
seen	O
as	O
a	O
huge	O
innovation	O
towards	O
tracking	O
falls	O
among	O
the	O
elderly	O
.	O
</s>
<s>
WiTrack	B-Algorithm
is	O
still	O
able	O
to	O
detect	O
a	O
person	O
's	O
arm	O
gesture	O
even	O
through	O
physical	O
objects	O
.	O
</s>
<s>
WiTrack	B-Algorithm
's	O
ability	O
to	O
track	O
motion	O
with	O
such	O
ease	O
and	O
simplicity	O
will	O
make	O
it	O
useful	O
in	O
tracking	O
elderly	O
patients	O
at	O
high	O
risk	O
of	O
falling	O
.	O
</s>
<s>
WiTrack	B-Algorithm
is	O
able	O
to	O
differentiate	O
a	O
fall	O
from	O
sitting	O
down	O
or	O
standing	O
,	O
it	O
's	O
able	O
to	O
recognize	O
a	O
fall	O
as	O
a	O
fast	O
change	O
in	O
the	O
distance	O
between	O
the	O
person	O
and	O
the	O
ground	O
.	O
</s>
<s>
WiTrack	B-Algorithm
is	O
able	O
to	O
detect	O
a	O
lethal	O
fall	O
with	O
a	O
high	O
accuracy	O
percentage	O
of	O
96.9	O
%	O
,	O
making	O
it	O
easy	O
and	O
reliable	O
to	O
use	O
.	O
</s>
<s>
WiTrack	B-Algorithm
is	O
one	O
of	O
many	O
attempts	O
at	O
3-D	O
motion	O
tracking	O
technology	O
.	O
</s>
<s>
Worldwide	O
known	O
gaming	O
consoles	O
,	O
such	O
as	O
the	B-Operating_System
Wii	I-Operating_System
and	O
Xbox	B-Algorithm
Kinect	I-Algorithm
,	O
have	O
long	O
been	O
praised	O
for	O
interacting	O
with	O
their	O
players	O
,	O
involving	O
them	O
in	O
physical	O
activity	O
.	O
</s>
<s>
These	O
other	O
medical	O
alarms	O
can	O
detect	O
the	O
fall	O
of	O
a	O
person	O
through	O
the	O
use	O
of	O
3-D	O
motion	O
sensors	O
,	O
similar	O
to	O
the	O
WiTrack	B-Algorithm
.	O
</s>
<s>
Another	O
obstacle	O
that	O
stands	O
on	O
the	O
way	O
is	O
the	O
fact	O
that	O
WiTrack	B-Algorithm
is	O
only	O
able	O
to	O
identify	O
one	O
person	O
at	O
a	O
time	O
,	O
but	O
this	O
is	O
being	O
resolved	O
at	O
the	O
time	O
by	O
the	O
MIT	O
team	O
.	O
</s>
