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. 8
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3,
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17
, p
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11
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.
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-
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743
Rec
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18
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r.
So
i
t
i
s
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n
d
a
m
e
n
t
a
l
fo
r
e
a
c
h
p
a
re
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t
to
h
a
v
e
a
d
o
m
i
n
a
ti
n
g
re
a
c
t
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o
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r
s
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e
l
d
t
h
e
c
h
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d
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o
m
m
i
s
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g
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Howe
v
e
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th
e
c
o
u
p
l
e
o
f
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PS
b
a
s
e
d
a
ft
e
r
th
i
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g
s
a
re
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p
e
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i
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e
m
a
rk
e
t,
th
e
y
c
o
s
t
h
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d
a
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e
d
s
a
m
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n
th
t
o
m
o
n
th
c
h
a
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e
fo
r
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M
a
d
v
a
n
t
a
g
e
.
En
e
rg
i
z
e
G
P
S
i
s
s
i
g
n
i
fi
c
a
n
t
fo
r
o
u
ts
i
d
e
a
ft
e
r
a
n
d
n
o
t
f
o
r
n
e
a
rb
y
s
p
o
ts
l
i
k
e
s
tr
i
p
s
h
o
p
p
i
n
g
c
e
n
t
e
rs
o
r
h
o
u
s
e
s
.
Al
s
o
,
th
e
th
i
n
g
s
a
c
c
e
s
s
i
b
l
e
i
n
t
h
e
m
a
r
k
e
t
a
re
n
o
t
v
i
e
win
g
t
h
e
i
m
p
ro
v
e
m
e
n
t
o
f
a
y
o
u
n
g
wea
ri
n
g
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t
.
O
u
r
a
n
s
wer
u
ti
l
i
z
e
s
two
c
o
n
tra
p
ti
o
n
s
fo
r
p
a
re
n
t
a
n
d
t
y
k
e
,
c
l
e
a
r
R
F
c
o
rre
s
p
o
n
d
e
n
c
e
b
e
twe
e
n
g
a
d
g
e
ts
,
v
i
rtu
a
l
fe
n
c
i
n
g
u
s
i
n
g
RF
a
n
d
ty
k
e
i
m
p
ro
v
e
m
e
n
t
v
i
e
wi
n
g
.
Th
e
p
a
re
n
t
a
n
d
c
h
i
l
d
c
a
n
wea
r
th
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s
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e
v
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ra
th
e
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th
a
n
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s
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e
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t
d
i
s
p
l
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y
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ti
m
e
d
a
ta
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o
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m
.
Key
w
ords
:
G
PS,
tra
c
k
i
n
g
s
e
n
s
o
r,
RF
c
o
m
m
u
n
i
c
a
ti
o
n
,
t
y
k
e
,
G
S
M
n
e
two
rk
,
v
o
i
c
e
d
e
te
c
ti
o
n
Copy
ri
gh
t
©
2
0
1
7
In
s
titu
te
o
f
Adv
a
nc
e
d
Eng
in
e
e
ring
a
nd
Sc
ie
nc
e
.
All
righ
t
s
re
s
e
rve
d.
1.
Int
r
o
d
u
ctio
n
P
aren
ts
w
a
nt
to
k
ee
p
an
e
y
e
o
n
the
i
r
ba
b
i
es
at
a
n
y
ti
m
e
w
he
n
the
y
are
a
wa
y
f
r
o
m
ho
m
e.
T
ha
t
i
s
m
ore
r
el
ev
a
nt
i
n
the
pres
en
t
urba
n
l
i
f
e,
where
bo
th
pa
r
e
nts
w
an
t
t
o
ea
r
n
i
nc
om
e
an
d
as
a
r
es
ul
t
u
na
b
l
e
t
o
att
en
d
m
os
t
o
f
the
ti
m
e.
G
P
S
m
ea
ns
G
l
ob
a
l
P
os
i
ti
on
i
ng
S
y
s
tem
[1]
an
d
i
t
i
s
us
ed
t
o
f
i
nd
o
ut
t
he
l
oc
a
ti
on
.
Rem
ov
a
l
of
he
r
r
i
ng
b
on
e
ef
f
ec
ts
f
r
o
m
A
E
M
d
ata
m
ap
s
us
i
ng
t
he
R
ad
o
n
tr
a
ns
f
or
m
di
s
c
us
s
ed
i
n
[2]
.
A
c
as
e
s
tud
y
of
ef
f
ec
ti
v
e
do
s
e
r
ed
u
c
ti
on
t
hroug
h
v
en
ti
l
at
i
on
s
c
he
m
e:
Des
i
g
n
ph
i
l
os
op
h
y
i
n
prot
ot
y
pe
f
as
t
breed
er
r
ea
c
tor
pres
en
te
d
i
n
[
3
-
4].
S
ho
r
e
l
i
ne
e
v
o
l
ut
i
o
n
du
e
t
o
the
c
on
s
tr
uc
t
i
on
of
r
ub
bl
e
m
ou
nd
j
ett
i
es
at
M
un
am
ba
m
i
nl
et
i
n
E
r
na
k
ul
am
–
T
r
i
c
hu
r
di
s
tr
i
c
t
of
the
s
tat
e
o
f
K
eral
a
i
n
the
In
di
a
n
pe
ni
ns
u
l
a
e
x
pl
ai
ne
d
i
n
[5]
.
A
tte
nu
at
i
o
n
of
Ne
ga
t
i
v
e
I
m
pa
c
ts
b
y
Mi
c
r
o
A
l
ga
e
a
nd
E
nric
h
ed
A
r
tem
i
a
S
a
l
i
na
o
n
P
en
a
eu
s
Mo
no
do
n
an
d
L
i
top
en
a
eu
s
V
an
n
am
ei
La
r
v
a
l
C
ul
t
ure
di
s
c
us
s
ed
i
n
[6
].
A
l
s
o,
the
pro
du
c
ts
av
a
i
l
ab
l
e
i
n
the
m
ar
k
et
are
no
t
m
on
i
tori
n
g
the
ac
t
i
v
i
t
y
of
a
c
hi
l
d
w
e
arin
g
i
t.
In
t
hi
s
de
v
i
c
e
ha
nd
y
f
or
pa
r
en
ts
.
S
o
t
hi
s
d
ev
i
c
e
c
al
l
e
d
as
c
hi
l
d
tr
ac
k
er.
Ch
i
l
d's
d
ev
i
c
e
a
l
erts
th
e
pa
r
e
nt.
T
hi
s
pa
pe
r
di
s
pu
t
ed
f
r
om
f
ol
l
o
wi
ng
r
es
ea
r
c
h
arti
c
l
es
an
d
s
ec
urit
y
c
an
b
e
a
dd
e
d
f
or
da
ta
ac
c
es
s
us
i
ng
P
r
e
v
en
t
i
o
n
of
Co
-
op
erati
v
e
B
l
ac
k
Hol
e
a
tta
c
k
on
DS
R
protoc
o
l
us
i
ng
Cr
y
pto
grap
hi
c
A
l
g
orit
hm
[7
].
a.
when
the
c
h
i
l
d rem
ov
i
n
g t
h
e d
e
v
i
c
e
b.
If
, th
e c
hi
l
d c
r
os
s
es
th
e
v
i
r
t
ua
l
f
en
c
e.
c.
If
, th
e b
a
b
y
f
e
l
l
.
d.
If
, th
e d
e
v
i
c
e s
ub
m
erged
i
n
wate
r
f
or f
ew
c
o
ns
ec
uti
v
e
s
ec
on
ds
.
e.
If
, t
he
c
hi
l
d's
bo
d
y
tem
pe
r
at
ure or h
ea
r
t rat
e i
s
a
bn
orm
al
.
A
c
hi
l
d
c
an
s
en
d
S
O
S
a
l
ert
to
the
p
arent
wi
th
a
s
i
ng
l
e
k
e
y
a
v
a
i
l
ab
l
e.
B
oth
th
e
de
v
i
c
e
wi
l
l
ac
t a
s
a
watc
h t
h
at
s
ho
w
s
t
he
t
i
m
e,
da
te
a
nd
da
y
i
nf
orm
ati
on
.
2.
W
o
r
king
P
r
in
ciple
T
he
m
ai
n
ai
m
of
thi
s
proj
ec
t
i
s
to
tr
ac
k
i
ng
an
d
m
on
i
tori
ng
the
c
h
i
l
d
b
y
us
i
ng
wi
r
el
es
s
tec
hn
o
l
og
y
s
uc
h
as
IR
i
s
f
ol
l
o
w
e
d
b
y
T
o
he
l
p
th
e
pa
r
en
ts
to
c
on
tr
o
l
the
ba
b
y
f
r
om
an
y
wher
e
at
an
y
t
i
m
e,
w
h
eth
er
i
n
th
e
n
ex
t
r
oo
m
or
aw
a
y
f
r
om
ho
m
e.
T
he
de
v
i
c
e
c
a
n
be
k
ep
t
ph
y
s
i
c
al
l
y
at
a
s
af
e d
i
s
t
an
c
e
a
w
a
y
f
r
om
th
e b
a
b
y
.
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N:
2
50
2
-
4
75
2
IJE
E
CS
V
ol
.
8
,
N
o.
3,
Dec
e
m
be
r
20
17
:
7
4
3
–
7
4
6
744
F
i
gu
r
e
1
.
C
hi
l
d D
ev
i
c
e
F
i
gu
r
e
2
.
P
aren
t De
v
i
c
e
T
he
proj
ec
t
en
ti
t
l
e
d
“
Ch
i
l
d
T
r
ac
k
i
ng
S
y
s
tem
”
i
s
an
a
pp
l
i
c
ati
on
t
ha
t
al
l
o
w
s
p
are
nts
to
m
on
i
tor
the
i
r
c
hi
l
d's
.
F
i
g
ur
e
1
s
ho
w
s
tha
t
t
he
c
h
i
l
d
ap
pa
r
atu
s
.
T
he
s
e
de
v
i
c
es
ha
v
e
m
ul
ti
pl
e
s
en
s
ors
s
uc
h
as
te
m
pe
r
atu
r
e
s
en
s
or,
w
at
er
l
e
v
e
l
s
en
s
or,
he
art
r
ate
s
en
s
or
an
d
p
r
es
s
ure
l
ev
e
l
s
en
s
or.
E
ac
h
s
en
s
or
f
i
nd
s
ou
t
the
c
hi
l
d
s
tat
us
.
F
i
g
u
r
e
2
s
h
o
w
s
th
at
t
he
pa
r
e
n
t
de
v
i
c
e
.
B
oth
de
v
i
c
es
ha
v
e
RF
tr
an
s
c
ei
v
er.
RF
tr
an
s
c
ei
v
er
i
s
us
ed
to
c
o
m
m
un
i
c
ate
wi
th
pa
r
e
nt
de
v
i
c
e
an
d
c
hi
l
d
d
ev
i
c
e.
T
he
m
ai
n
a
i
m
of
th
i
s
pa
pe
r
ex
pl
ai
n
ed
tha
t
th
e
c
h
i
l
d
d
ev
i
c
e
c
om
m
un
i
c
ate
s
w
i
th
th
e
pa
r
en
t
d
ev
i
c
e.
It
i
s
a
wi
r
el
e
s
s
ne
tw
ork
de
s
i
gn
.
RT
C
m
ea
ns
Rea
l
T
i
m
e
Cl
oc
k
.
S
o
tho
s
e
de
v
i
c
es
di
s
pl
a
y
th
e
r
ea
l
ti
m
e
c
l
oc
k
.
B
oth
d
ev
i
c
es
c
on
tr
ol
l
ed
b
y
the
m
i
c
r
oc
on
tr
ol
l
er.
B
o
th
de
v
i
c
es
ha
v
e
a
n
i
nd
i
v
i
d
ua
l
s
c
r
ee
n.
T
he
s
e d
i
s
pl
a
y
us
ed
to
m
on
i
tor t
he
c
hi
l
d s
tat
us
.
Evaluation Warning : The document was created with Spire.PDF for Python.
IJE
E
CS
IS
S
N:
2
50
2
-
4
75
2
Chi
l
d Tr
ac
k
er: P
r
es
en
c
e a
n
d L
oc
at
i
o
n
F
i
nd
i
ng
S
y
s
tem
to
P
r
o
tec
t Ch
i
l
d…
(
G
.
S
en
t
hi
l
na
t
ha
n
)
745
3.
Re
sult
s a
n
d
D
isc
u
s
sio
n
F
i
gu
r
e
3
.
H
ard
w
are
Im
pl
em
en
tat
i
o
n o
f
P
are
nt
D
ev
i
c
e
F
i
gu
r
e
3
.
H
ard
w
are
Im
pl
em
en
tat
i
o
n o
f
Chi
l
d
De
v
i
c
e
T
he
s
y
s
tem
ex
ec
uti
on
c
on
c
en
tr
ate
s
on
t
ak
i
ng
af
ter
of
c
hi
l
d's
ad
v
a
nc
em
en
t
to
an
d
f
r
o
m
s
c
ho
ol
.
A
pa
r
t
i
c
ul
ar
r
eg
i
on
c
an
be
p
ortr
a
y
e
d
f
or
ea
c
h
t
y
k
e
f
r
ee
l
y
,
s
o
i
f
the
c
h
i
l
d
m
ov
e
d
ou
ts
i
de
of
de
s
c
r
i
bi
ng
r
an
ge
prepare
d
m
e
s
s
ag
e
wi
l
l
b
e
g
i
v
en
t
o
g
ate
k
ee
pe
r
s
.
In
l
i
k
e
m
an
ne
r
,
i
f
the
b
ab
y
i
s
c
r
y
i
ng
i
n
l
i
gh
t
of
c
urr
en
t
c
i
r
c
um
s
tan
c
es
m
ad
e
m
es
s
ag
e
wi
l
l
be
s
en
t
to
the
p
arent.
T
he
f
r
ee
f
or
al
l
s
w
i
tc
he
s
g
i
v
en
at
c
h
i
l
d
m
od
ul
e
tha
t
c
an
be
us
ed
b
y
a
n
ad
o
l
es
c
en
t
to
prepar
e
h
i
s
p
eo
p
l
e.
No
w
a
da
y
’
s
m
os
t o
f
th
e p
arents
a
r
e wo
r
k
i
ng
. S
o t
h
at
t
i
m
e t
he
s
e d
e
v
i
c
es
are
m
ore us
ef
ul
.
4.
Co
n
clus
ion
Chi
l
d
T
r
ac
k
i
ng
S
y
s
tem
c
an
ov
erc
om
e
the
di
s
ad
v
a
nta
g
es
of
the
pres
en
tl
y
e
x
i
s
ti
ng
f
r
a
m
ew
ork
.
It
i
s
a
prec
i
ou
s
ap
pl
i
c
ati
on
whi
c
h
he
l
ps
pa
r
en
ts
to
s
c
r
ee
n
th
e
i
r
y
o
u
ng
s
ters
b
y
f
ol
l
o
wi
ng
th
ei
r
ph
o
ne
ex
erc
i
s
es
,
pro
gram
c
on
du
c
t,
a
n
d
G
P
S
area.
In
th
i
s
pa
pe
r
ex
pl
a
i
ne
d
t
wo
de
v
i
c
es
s
uc
h
as
pa
r
en
t
de
v
i
c
e
a
nd
c
hi
l
d
de
v
i
c
e.
T
he
pa
r
en
t
d
ev
i
c
e
ha
s
T
em
pe
r
atu
r
e
s
en
s
or,
A
c
c
i
de
n
t
l
oc
a
ti
o
n
s
en
s
or,
V
oi
c
e
Det
ec
tor,
G
S
M,
an
d
G
P
S
.
I
t
i
d
en
t
i
f
i
es
the
b
od
y
te
m
pe
r
atu
r
e
of
the
c
hi
l
dre
n.
G
S
M
s
en
d
al
erts
f
r
o
m
c
hi
l
d
d
ev
i
c
e
t
o
pa
r
e
nt
de
v
i
c
e.
S
o
th
at
pa
r
en
ts
q
ui
c
k
l
y
de
term
i
ne
the
c
h
i
l
d
c
urr
en
t
l
oc
ati
on
a
nd
c
on
di
ti
o
n.
It
f
oc
us
es
on
c
urr
en
t
c
hi
l
d
po
s
i
ti
o
n
an
d
i
t's
c
he
c
k
i
ng
th
e s
tat
us
of
th
e c
hi
l
d i
s
s
e
nt
to
pa
r
e
nt
d
ev
i
c
e
th
r
ou
g
h RF tr
a
ns
c
ei
v
er.
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N:
2
50
2
-
4
75
2
IJE
E
CS
V
ol
.
8
,
N
o.
3,
Dec
e
m
be
r
20
17
:
7
4
3
–
7
4
6
746
Ref
er
en
ce
s
[1
]
Y
u
i
c
h
i
ro
M
O
RI,
e
t
a
l
.
A
Se
l
f
-
Con
fi
g
u
ra
b
l
e
New
G
e
n
e
ra
ti
o
n
Chi
l
d
r
e
n
T
ra
c
k
i
n
g
Sy
s
te
m
b
a
s
e
d
o
n
M
o
b
i
l
e
Ad
Ho
c
N
e
tw
o
rk
s
Co
n
s
i
s
t
i
n
g
o
f
An
d
r
o
i
d
M
o
b
i
l
e
T
e
rm
i
n
a
l
s
.
2
0
1
1
.
[2
]
J
Sa
ra
n
y
a
a
n
d
J
Se
l
v
a
k
u
m
a
r
.
Im
p
l
e
m
e
n
ta
ti
o
n
o
f
Ch
i
l
d
re
n
T
ra
c
k
i
n
g
Sy
s
te
m
o
n
An
d
r
o
i
d
M
o
b
i
l
e
T
e
rm
i
n
a
l
s
.
2
0
1
3
.
[3
]
J
a
e
Hy
u
n
g
Cho
a
n
d
M
y
e
o
n
g
-
W
o
o
Cho
.
Eff
e
c
t
i
v
e
Po
s
i
ti
o
n
T
ra
c
k
i
n
g
Us
i
n
g
B
-
Sp
l
i
n
e
Su
rfa
c
e
Eq
u
a
ti
o
n
Ba
s
e
d
o
n
W
i
re
l
e
s
s
Se
n
s
o
r Ne
t
w
o
rk
s
a
n
d
P
a
s
s
i
v
e
UHF
-
RFID
.
2
0
1
3
.
[4
]
T
o
m
o
y
u
k
i
O
h
ta
,
e
t
al
.
A
n
a
d
a
p
ti
v
e
m
u
l
t
i
h
o
p
c
l
u
s
t
e
ri
n
g
s
c
h
e
m
e
fo
r
a
d
h
o
c
n
e
tw
o
rk
s
w
i
th
h
i
g
h
m
o
b
i
l
i
ty
.
2
0
0
3
.
[5
]
Ei
ta
ro
Ko
h
n
o
e
t
a
l
.
Se
c
u
re
d
e
c
e
n
tra
l
i
z
e
d
d
a
ta
tra
n
s
f
e
r
a
g
a
i
n
s
t
n
o
d
e
c
a
p
tu
r
e
a
tt
a
c
k
s
fo
r
w
i
re
l
e
s
s
s
e
n
s
o
r
n
e
tw
o
rk
.
2
0
0
9
.
[6
]
Luo
S a
n
d
Hu
Q
.
A
Dy
n
a
m
i
c
M
o
ti
o
n
Pa
tt
e
rn
A
n
a
l
y
s
i
s
Ap
p
ro
a
c
h
t
o
F
a
l
l
De
t
e
c
t
i
o
n
.
2
0
0
4
.
[7
]
Ve
n
n
i
l
a
G
,
Ari
v
a
z
h
a
g
a
n
D
&
M
a
n
i
c
k
a
s
a
n
k
a
r
i
N.
Pre
v
e
n
ti
o
n
o
f
Co
-
o
p
e
ra
t
i
v
e
Bl
a
c
k
Hol
e
a
tt
a
c
k
i
n
M
a
n
e
t
o
n
DSR
p
ro
to
c
o
l
u
s
i
n
g
Cry
p
to
g
ra
p
h
i
c
Al
g
o
ri
th
m
.
I
n
te
rn
a
t
i
o
n
a
l
J
o
u
rn
a
l
o
f
En
g
i
n
e
e
ri
n
g
a
n
d
Te
c
h
n
o
l
o
g
y
(
IJ
ET)
.
2
0
1
4
;
6
(
5
)
:
2401.
Evaluation Warning : The document was created with Spire.PDF for Python.