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tian
c
h
ild
r
en
u
s
e
m
o
b
ile
f
r
o
m
a
g
e
8
.
I
n
I
n
d
ia,
J
ap
an
,
an
d
P
ar
ag
u
a
y
,
ch
ild
r
en
m
o
b
ile
u
s
a
g
e
r
ate
s
in
cr
ea
s
in
g
f
r
o
m
a
g
e
1
0
[
6
]
.
So
,
it
is
v
er
y
clea
r
ev
id
en
ce
t
h
at
c
h
ild
r
en
ar
e
v
er
y
i
n
ter
ested
i
n
u
s
i
n
g
s
m
ar
tp
h
o
n
es
w
o
r
ld
w
id
e,
w
h
ic
h
is
c
u
r
r
en
tl
y
a
v
er
y
co
n
ce
r
n
i
s
s
u
e.
On
th
e
o
t
h
er
h
an
d
,
A
s
p
er
Dr
A
.
P
.
J
A
b
d
u
l
Kala
m
's
w
o
r
d
s
,
“
Yo
u
n
g
s
ter
s
ar
e
th
e
f
u
t
u
r
e
p
illar
s
o
f
o
n
e's
n
atio
n
”
,
to
d
a
y
'
s
c
h
ild
r
en
ar
e
to
m
o
r
r
o
w
s
lead
er
s
; p
r
eser
v
i
n
g
t
h
eir
d
r
ea
m
s
an
d
l
iv
e
s
a
b
etter
f
u
tu
r
e
i
s
cr
u
cial
f
o
r
ev
er
y
n
atio
n
[
7
]
.
No
w
ad
a
y
s
,
k
id
s
'
ca
n
k
n
o
w
ab
o
u
t
p
r
esen
t
tech
n
o
lo
g
y
t
h
r
o
u
g
h
a
s
m
ar
t
d
ev
ice.
I
t
m
a
y
a
f
f
ec
t
th
eir
p
h
y
s
ical
an
d
m
en
ta
l
d
ev
elo
p
m
e
n
t
a
n
d
h
a
m
p
er
th
eir
ed
u
ca
tio
n
al
a
n
d
co
m
m
u
n
a
l
li
f
e.
P
ar
en
ts
ar
e
g
etti
n
g
w
o
r
r
ied
ab
o
u
t
th
ese
th
i
n
g
s
[
8
]
-
[
1
0
]
.
C
o
n
s
id
er
in
g
th
e
p
r
es
en
t
s
it
u
atio
n
,
p
ar
en
t
s
n
ee
d
s
m
ar
t
tech
n
o
lo
g
y
f
o
r
m
o
n
ito
r
i
n
g
an
d
co
n
tr
o
lli
n
g
th
e
ir
ch
ild
r
en
's
m
o
v
e
m
e
n
t.
I
n
o
u
r
d
ig
ital
er
a,
ch
ild
r
en
u
s
e
s
m
ar
t
d
ev
ices
lik
e
t
ab
lets
.
Fo
r
th
is
r
ea
s
o
n
,
p
ar
en
t
s
n
ee
d
t
o
k
n
o
w
h
o
w
m
an
y
ti
m
e
s
th
e
y
u
s
e
tab
le
ts
,
w
h
ic
h
t
y
p
e
o
f
w
e
b
s
ite
th
e
y
v
is
i
t,
an
d
w
h
ic
h
s
ite
t
h
e
y
s
p
e
n
d
th
eir
ti
m
e
o
n
m
o
r
e.
E
v
er
y
t
h
i
n
g
i
s
p
o
s
s
ib
le
th
r
o
u
g
h
u
s
i
n
g
au
to
m
ated
tech
n
o
lo
g
y
.
So
p
ar
en
ts
n
ee
d
au
to
m
a
ted
tech
n
o
lo
g
y
f
o
r
th
i
s
p
u
r
p
o
s
e
[
1
1
]
.
I
n
th
is
cir
cu
m
s
tan
ce
,
ev
er
y
p
ar
en
t
tr
ies
to
g
iv
e
th
ei
r
b
est
co
n
ce
r
n
to
tak
e
ca
r
e
o
f
th
eir
ch
ild
r
en
to
s
a
v
e
t
h
e
m
f
r
o
m
th
e
d
ar
k
w
o
r
ld
an
d
th
e
tech
n
o
lo
g
y
's
b
ad
ef
f
ec
ts
to
s
av
e
t
h
eir
ch
ild
r
en
's
f
u
tu
r
e.
T
h
e
r
esear
ch
h
as
b
ee
n
g
i
v
en
m
o
r
e
f
o
cu
s
o
n
p
a
r
en
tal
co
n
tr
o
l
o
v
er
ch
ild
r
en
's
m
o
b
ile
d
ev
ice
s
.
2.
L
I
T
E
R
AT
U
RE
R
E
VI
E
W
A
s
m
ar
t
m
o
b
ile
p
h
o
n
e
p
r
o
v
id
es
v
ar
io
u
s
u
p
to
d
ate
s
er
v
ices
to
u
s
.
Usi
n
g
t
h
e
g
lo
b
al
p
o
s
itio
n
in
g
s
y
s
te
m
(
GP
S)
,
w
e
ca
n
g
et
to
k
n
o
w
o
u
r
d
ev
ices
'
g
eo
g
r
ap
h
ic
lo
ca
tio
n
a
n
d
g
i
v
e
in
f
o
r
m
atio
n
th
r
o
u
g
h
h
o
r
t
m
e
s
s
a
g
e
s
er
v
ice
(
SMS)
s
er
v
ice.
Al
-
Ma
z
lo
u
m
e
t
a
l
.
u
s
ed
th
ese
t
w
o
s
er
v
ices
in
th
eir
p
r
o
p
o
s
ed
s
y
s
te
m
.
T
h
e
y
i
n
tr
o
d
u
ce
d
GP
S
an
d
SMS
-
b
ased
ch
ild
tr
ac
k
i
n
g
s
y
s
te
m
u
s
i
n
g
s
m
ar
t
p
h
o
n
e
[
1
2
]
.
T
h
is
p
ap
er
d
escr
ib
es
h
o
w
a
s
m
ar
t
m
o
b
ile
p
h
o
n
e
h
elp
s
p
ar
en
ts
tr
ac
k
th
eir
ch
ild
r
en
in
r
ea
l
-
ti
m
e.
Mo
s
t
k
id
s
an
d
p
a
r
en
ts
u
s
e
an
an
d
r
o
id
m
o
b
ile
p
h
o
n
e,
an
d
th
e
y
k
n
o
w
th
e
m
o
b
ile
p
h
o
n
e
's av
ail
ab
le
s
er
v
ice.
T
h
eir
p
r
o
p
o
s
ed
s
y
s
te
m
co
n
s
i
s
ts
o
f
t
w
o
s
id
es,
th
e
ch
ild
s
id
e
an
d
th
e
p
ar
en
t
s
id
e.
A
r
eq
u
e
s
t
SM
S
g
o
es
to
th
e
c
h
ild
's
d
ev
ice
to
k
n
o
w
t
h
e
c
h
ild
's
e
x
ac
t
lo
ca
tio
n
f
r
o
m
t
h
e
p
ar
en
t
d
ev
ice.
Af
ter
g
et
tin
g
t
h
e
r
eq
u
est S
MS,
th
e
ch
ild
's d
ev
ice
r
ep
lies
to
th
e
p
ar
en
t's
d
ev
ice
'
s
GP
S p
o
s
itio
n
.
Ko
th
a
w
ad
e
et
a
l
.
[
1
3
]
p
r
o
p
o
s
e
d
a
s
y
s
te
m
“
m
u
lti
-
p
lat
f
o
r
m
ap
p
licatio
n
f
o
r
p
ar
en
t
an
d
s
c
h
o
o
l
u
s
i
n
g
GP
S
tr
ac
k
in
g
”
.
I
n
t
h
is
p
ap
er
,
th
e
y
d
ev
elo
p
ed
a
GP
S
b
ased
ap
p
licatio
n
s
y
s
te
m
f
o
r
an
o
r
g
an
i
za
tio
n
a
n
d
p
ar
en
t
s
m
o
b
ile
s
.
T
h
e
o
r
g
an
izatio
n
ca
n
u
s
e
t
h
is
ap
p
licatio
n
f
o
r
m
o
n
ito
r
in
g
a
n
d
tr
ac
k
i
n
g
th
e
lo
ca
tio
n
o
f
th
e
s
ch
o
o
l
b
u
s
es.
P
ar
en
ts
ca
n
g
et
t
h
e
ad
d
r
ess
es
o
f
th
eir
c
h
ild
r
en
an
d
lo
ca
te
th
e
m
o
n
h
i
s
/
h
er
m
o
b
ile
d
ev
ices.
S
ch
o
o
l
au
th
o
r
it
y
a
ls
o
ca
n
m
o
n
i
to
r
an
d
tr
ac
k
th
e
s
ch
o
o
l
b
u
s
es
ti
m
el
y
a
n
d
en
s
u
r
es
th
e
s
af
et
y
o
f
ch
i
ld
r
en
.
I
t
also
all
o
w
s
p
ar
en
ts
to
tr
ac
k
r
ea
l
-
ti
m
e
in
f
o
r
m
a
tio
n
ab
o
u
t
t
h
e
s
ch
o
o
l
b
u
s
d
u
r
i
n
g
tr
av
el
s
.
Al
m
o
m
a
n
i
et
al
.
[
1
4
]
p
r
o
p
o
s
ed
a
s
y
s
te
m
w
i
th
t
w
o
t
y
p
es
o
f
ap
p
licatio
n
s
a
w
eb
ap
p
licatio
n
an
d
a
m
o
b
ile
ap
p
licatio
n
f
o
r
a
u
s
er
f
ac
ilit
y
.
A
u
s
er
ca
n
ac
ce
s
s
th
i
s
s
y
s
te
m
at
a
n
y
ti
m
e
f
r
o
m
a
n
y
wh
er
e.
T
h
er
e
ar
e
t
w
o
s
id
es:
clie
n
t
-
s
er
v
er
.
T
h
e
s
er
v
er
-
s
id
e
ca
r
r
ies
a
GP
R
S,
a
w
eb
,
an
d
a
n
SM
S
s
er
v
er
,
an
d
t
h
e
clien
t
-
s
id
e
co
n
tai
n
s
a
GP
S
tr
a
ck
er
an
d
a
G
P
S
m
o
d
e
m
.
T
h
e
u
s
er
in
f
o
r
m
atio
n
is
s
to
r
ed
in
th
e
d
atab
ase
o
n
th
e
s
er
v
er
-
s
id
e
[
1
4
]
.
T
h
er
e
is
an
o
th
er
s
i
m
ilar
co
n
ce
p
t
u
s
ed
b
y
Al
-
S
u
w
aid
i
an
d
Z
e
m
er
l
y
[
1
5
]
in
th
eir
p
r
o
p
o
s
ed
s
y
s
te
m
n
a
m
ed
“
lo
ca
tin
g
f
r
ie
n
d
s
an
d
f
a
m
il
y
u
s
i
n
g
m
o
b
ile
p
h
o
n
es
w
it
h
a
g
lo
b
al
p
o
s
itio
n
in
g
s
y
s
te
m
(
GP
S)
”
.
T
h
e
y
h
av
e
also
d
ev
elo
p
ed
t
w
o
ap
p
r
o
ac
h
es:
th
e
clie
n
t
-
s
er
v
er
ap
p
r
o
a
ch
.
T
h
is
p
ap
er
s
h
o
w
ed
b
o
th
clien
ts
h
a
v
e
th
e
s
a
m
e
co
n
tr
o
l a
n
d
co
m
m
a
n
d
p
r
iv
ile
g
es,
w
h
er
ea
s
t
h
e
o
th
er
s
y
s
te
m
d
o
es n
o
t p
r
o
v
id
e
it.
Gao
et
a
l
.
[
1
6
]
d
ev
elo
p
ed
a
s
ec
u
r
it
y
m
e
th
o
d
n
a
m
ed
ch
ild
g
u
ar
d
o
n
s
m
ar
t
d
ev
ices
f
o
r
o
b
s
er
v
in
g
ch
ild
r
en
's
ac
tiv
i
ties
i
n
r
ea
l
-
ti
m
e
.
Gu
ar
d
ian
s
u
s
ed
t
h
is
s
y
s
te
m
at
a
lo
w
co
s
t,
an
d
t
h
e
y
ca
n
g
e
t
b
etter
b
en
ef
its
b
y
u
s
i
n
g
th
is
s
y
s
te
m
.
Satis
h
et
a
l.
[
1
7
]
d
escr
ib
ed
th
eir
p
a
p
er
a
b
o
u
t
an
an
d
r
o
id
a
p
p
licatio
n
u
s
ed
to
tr
ac
k
m
i
s
s
i
n
g
ch
ild
r
en
.
T
h
e
an
d
r
o
id
ap
p
licatio
n
w
o
r
k
s
w
i
t
h
t
w
o
s
er
v
ices:
GP
S
an
d
SMS
s
er
v
ice.
T
h
e
G
P
S
is
u
s
ed
to
tr
ac
k
th
e
lo
ca
tio
n
o
f
t
h
e
m
is
s
i
n
g
c
h
ild
.
I
f
GP
S
s
er
v
ice
i
s
u
n
ab
le
,
th
e
ap
p
licatio
n
ca
n
w
o
r
k
w
i
th
SMS
s
er
v
ice
b
y
s
en
d
i
n
g
a
n
d
r
ec
eiv
in
g
t
h
e
m
es
s
ag
e.
T
h
er
e
is
a
n
o
t
h
er
p
ap
er
w
h
er
e
th
e
r
esear
ch
er
Bh
oi
et
a
l.
[
1
8
]
im
p
le
m
e
n
ts
a
p
r
o
j
ec
t
b
ased
o
n
a
p
ar
ticu
lar
ar
ea
f
o
r
ea
ch
ch
ild
.
W
h
en
th
e
ch
ild
co
m
es
o
u
t
o
f
t
h
is
s
p
ec
i
f
ic
ar
ea
o
f
th
eir
s
ch
o
o
l,
th
en
a
n
aler
t m
e
s
s
a
g
e
s
en
d
s
to
th
e
p
ar
en
t'
s
m
o
b
ile
p
h
o
n
e
b
y
u
s
i
n
g
a
p
an
ic
s
w
itc
h
.
Sar
an
ya
et
a
l.
[
1
9
]
p
r
o
p
o
s
ed
a
ch
ild
m
o
n
ito
r
i
n
g
s
y
s
te
m
b
as
ed
o
n
an
d
r
o
id
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[
2
1
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[
2
3
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F
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2
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2
5
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[
2
6
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s.
[
2
7
]
F
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t
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x
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0
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2
.
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O
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.
[
2
8
]
F
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n
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q
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a
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t
y
.
[
2
9
]
F
o
c
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n
g
o
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a
u
t
i
sm a
sso
c
i
a
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O
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3.
RE
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:
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T
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elp
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v
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m
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.
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1
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1
]
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