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it
u
a
tio
n
s
w
h
e
r
e
a
h
u
g
e
v
ol
um
e
of
obj
e
c
t
s
i
n
hun
dr
e
ds
of
t
h
ous
a
n
d
s
e
x
i
s
t
a
n
d i
t
l
e
a
ds
t
o r
ol
e
pe
r
m
i
s
s
i
o
n
e
x
pl
os
i
on
pr
obl
e
m
.
T
h
e
A
B
A
C
m
o
d
e
l is
m
o
r
e
f
le
x
ib
l
e
th
a
n
R
B
A
C
b
u
t it
m
o
r
e
c
o
m
p
le
x
t
h
a
n
R
B
A
C
.
E
B
A
C
[
5
]
is
a
n
e
w
p
a
r
a
d
ig
m
t
h
at
ad
d
s
r
eact
i
v
e
f
u
n
c
t
i
o
n
al
i
t
y
t
o
acces
s
co
n
t
r
o
l
.
T
h
e E
B
A
C
s
y
s
t
e
m
ch
a
n
g
es
t
h
e acce
s
s
p
r
i
v
i
l
eg
e
s
o
f
u
s
er
s
d
y
n
a
m
i
cal
l
y
b
as
ed
o
n
d
i
f
f
er
e
n
t
d
at
ab
as
e an
d
t
e
m
p
o
r
al
e
v
en
t
s
.
I
n
a
n
E
B
A
C
s
y
s
t
e
m
,
t
h
e acc
es
s
co
n
t
r
o
l
p
o
l
i
ci
es
ar
e r
ep
r
es
en
t
ed
i
n
t
er
m
s
o
f
E
v
en
t
-
C
o
n
d
itio
n
-
A
ct
i
o
n
r
u
l
es
,
w
h
er
e
t
h
e
A
ct
i
o
n
p
ar
t
ch
an
g
es
t
h
e
acces
s
p
r
iv
ile
g
e
s o
f
u
se
r
s.
T
h
es
e
m
o
d
el
s
h
av
e
f
eat
u
r
e co
m
p
l
i
m
en
t
ar
y
t
o
eac
h
o
t
h
er
p
r
o
b
l
e
m
.
T
h
es
e
m
o
d
el
s
h
a
s
s
t
at
i
c
b
o
u
n
d
a
r
y
t
o
p
r
o
v
i
d
e acces
s
co
n
t
r
o
l
.
S
o
i
n t
h
i
s
p
a
p
e
r
,
a
n E
ve
nt
-
Ro
l
e
-
A
t
t
r
i
b
u
t
e B
as
ed
f
i
n
e
g
r
ai
n
ed
A
cces
s
C
o
n
t
r
o
l
m
e
c
h
a
n
i
s
m
i
s
pr
opos
e
d
w
hi
c
h
pr
ov
i
de
a
f
l
e
x
i
b
l
e b
o
u
n
d
ar
y
f
o
r
s
ec
u
r
i
t
y
p
o
l
i
ci
es
.
T
h
e s
ecu
r
i
t
y
p
o
l
i
ci
e
s
ar
e
d
ev
el
o
p
ed
b
as
ed
o
n
t
h
e ev
en
t
,
r
o
l
es
an
d
at
t
r
i
b
u
t
es
.
I
n
i
t
i
al
l
y
a f
i
n
e g
r
ai
n
ed
d
es
cr
i
p
t
i
o
n
i
s
d
ef
i
n
ed
an
d
d
ev
el
o
p
ed
an
ev
en
t
-
Ro
l
e
-
A
t
t
r
i
b
u
t
e b
as
ed
acces
s
co
n
t
r
o
l
m
e
ch
an
i
s
m
o
n
t
o
p
i
t
.
I
t
p
r
o
v
i
d
es
h
i
g
h s
e
c
ur
i
t
y
l
e
ve
l
t
o
b
i
g
d
at
a b
y
ch
a
n
g
i
n
g
u
s
er
’
s
,
o
b
j
ect
s
an
d
s
ecu
r
i
t
y
p
o
l
i
ci
es
b
as
ed
o
n
t
h
e ev
e
n
t
.
2.
LI
TER
A
TU
R
E
S
U
RVE
Y
A
m
i
r
,
M
.
,
et
al
[
6
]
p
r
o
p
o
s
ed
a n
o
v
e
l
t
o
k
e
n
b
as
ed
acces
s
co
n
t
r
o
l
b
as
ed
o
n
cas
cad
i
n
g
p
er
m
i
s
s
i
o
n
p
o
lic
y
to
c
o
n
tr
o
l in
te
r
a
c
ti
v
it
y
w
it
h
b
ig
d
at
a.
T
o
k
en
b
as
ed
acces
s
co
n
t
r
o
l
i
s
o
n
e o
f
t
h
e acces
s
co
n
t
r
o
l
m
ech
a
n
i
s
m
t
h
at
can
co
m
f
o
r
t
ab
l
y
h
an
d
l
e an
d
eas
i
l
y
h
a
n
d
l
e i
n
t
er
act
i
o
n
s
w
i
t
h
b
i
g
d
at
a.
I
t
al
s
o
en
ab
l
es
p
r
o
vi
s
i
o
ni
ng o
f
a
c
c
e
s
s
t
o
f
i
ne
l
e
ve
l
s
o
f
gr
a
n
ul
a
r
i
t
y b
ut
t
hi
s
a
p
p
r
o
a
c
h ha
r
d
t
o
m
a
na
ge
d
ur
i
n
g t
h
e
r
a
pi
d g
r
o
w
t
h
of
r
e
pos
i
t
or
y
.
T
h
i
s
pr
obl
e
m
i
s
h
a
n
dl
e
d b
y
pr
opos
e
d n
ov
e
l
t
ok
e
n
ba
s
e
d a
c
c
e
s
s
c
on
t
r
ol
ba
s
e
d
on
c
a
s
c
a
di
n
g
p
er
m
i
s
s
i
o
n
p
o
l
i
c
y
w
h
er
e t
h
e
acces
s
p
o
l
i
ci
es
ar
e e
x
t
e
n
d
ed
t
o
al
l
o
w
f
i
n
er
co
n
t
r
o
l
g
r
an
u
l
ar
i
t
y
o
f
v
i
s
i
b
l
e
r
es
o
u
r
ces
al
o
n
g
w
i
t
h
t
h
e co
n
t
ex
t
-
sp
eci
f
i
c p
ar
a
m
et
er
s
t
h
at
r
ef
i
n
e acces
s
b
as
ed
o
n
t
h
e o
r
i
g
i
n
co
n
t
e
x
t
.
B
u
t
t
h
i
s
cas
cad
i
n
g
p
er
m
i
s
s
i
o
n
p
o
l
i
c
y
m
o
d
el
can
n
o
t
b
e s
t
eer
ed
t
o
w
ar
d
s
t
h
e s
ec
u
r
i
t
y
r
eal
m
w
h
i
ch
p
r
o
v
i
d
e b
et
t
er
a
u
th
e
n
tic
a
tio
n
o
f
to
k
e
n
s
.
H
u
,
V
.
C
.
,
e
t
al
[
7
]
p
r
o
p
o
s
ed
a
g
en
er
al
acces
s
co
n
t
r
o
l
s
c
he
m
e
f
or
di
s
t
r
i
b
u
t
e
d B
i
g da
t
a
pr
oc
e
s
s
i
n
g
c
l
u
st
e
r
s.
I
n
t
hi
s
pa
pe
r
i
n
t
r
odu
c
e
d t
h
e
de
f
i
n
i
t
i
on
of
B
i
g
da
t
a
a
n
d i
l
l
u
s
t
r
a
t
e
d a
bi
g
da
t
a
pr
oc
e
s
s
m
ode
l
,
ab
s
t
r
act
ed
b
as
ed
o
n
g
en
er
al
d
i
s
t
r
i
b
u
t
ed
p
r
o
ces
s
i
n
g
e
n
v
i
r
o
n
m
en
t
a
n
d
p
r
es
en
t
ed
B
i
g
d
at
a acc
es
s
co
n
t
r
o
l
s
ch
e
m
e
an
d
co
n
s
i
d
er
at
i
o
n
s
b
as
ed
o
n
t
r
u
s
t
b
et
w
ee
n
B
i
g
d
at
a M
as
t
er
S
y
s
t
e
m
an
d
B
i
g
d
at
a s
o
u
r
ce p
r
o
v
i
d
er
s
an
d
s
i
m
u
l
t
a
n
eo
u
s
l
y
b
et
w
ee
n
co
o
p
er
at
i
n
g
s
y
s
t
e
m
an
d
Mas
t
er
s
y
s
t
e
m
.
T
h
e p
r
o
p
o
s
ed
acces
s
co
n
t
r
o
l
s
ch
e
m
e
f
o
cu
s
ed
on
a
u
t
h
or
i
z
a
t
i
on t
h
a
t
pr
ot
e
c
t
s
B
i
g
da
t
a
pr
oc
e
s
s
i
ng
a
n
d
d
at
a f
r
o
m
t
h
e i
n
s
i
d
er
at
t
ac
k
s
.
Mo
r
eo
v
er
i
t
u
s
ed
at
t
r
i
b
u
t
es
o
f
act
i
o
n
s
,
s
u
b
j
ect
s
,
act
i
o
n
s
an
d
s
o
m
et
i
m
e
s
en
v
i
r
o
n
m
e
n
t
co
n
d
i
t
i
o
n
s
w
h
i
c
h
d
et
er
m
i
n
e t
h
e acces
s
p
e
r
m
i
s
s
io
n
.
B
u
t th
e
s
e
c
u
r
it
y
o
f
B
ig
d
a
ta
is
s
t
ill c
h
a
lle
n
g
i
n
g
o
n
e
.
H
ua
ng,
J
.
,
e
t
a
l
[
8]
p
r
o
p
o
s
e
d
a
f
r
a
m
e
w
o
r
k
t
h
a
t i
n
te
g
r
a
te
s
A
ttr
ib
u
te
B
a
s
e
d
A
c
c
e
s
s
C
o
n
tr
o
l (
A
B
A
C
)
an
d
R
o
l
e B
as
ed
A
cce
s
s
C
o
n
t
r
o
l
(
R
B
A
C
)
.
T
h
e p
r
o
p
o
s
ed
f
r
am
e
w
o
r
k
u
s
ed
a
t
t
r
i
b
u
t
ed
b
as
ed
p
o
l
i
ci
es
t
o
cr
eat
e a
R
B
A
C
m
o
d
el
.
T
h
i
s
can
b
e
ach
i
ev
ed
b
y
m
o
d
el
i
n
g
R
B
A
C
i
n
t
o
t
w
o
l
ev
el
s
.
T
h
e
a
bove
g
r
oun
d l
e
v
e
l
i
s a
s
t
a
n
da
r
d R
B
A
C
m
ode
l
e
x
pa
n
de
d
w
i
t
h
e
nv
i
r
onm
e
n
t
a
n
d i
t
i
s
u
s
e
d t
o s
u
ppor
t
R
B
A
C
m
ode
l
v
e
r
i
f
i
c
a
t
i
on
.
A
n
o
th
e
r
le
v
e
l is
u
n
d
e
r
g
r
o
u
n
d
le
v
e
l th
a
t is
u
tiliz
e
d
to
r
e
p
r
e
s
e
n
t s
e
c
u
r
i
t
y
k
n
o
w
le
d
g
e
i
n
te
r
m
s
o
f
a
ttr
ib
u
te
b
a
s
e
d
p
o
lic
ie
s
th
a
t
a
u
to
m
a
tic
a
ll
y
g
e
n
e
r
a
te
s
t
h
e
s
i
m
p
l
e
R
B
A
C
m
o
de
l
i
n
t
h
e
a
bov
e
g
r
oun
d
l
e
v
e
l
.
T
h
i
s
f
r
a
m
e
w
or
k
t
a
c
k
l
e
s
t
h
e
pr
obl
e
m
o
f
pe
r
m
i
s
s
i
on
a
s
s
i
gnm
e
n
t
f
or
l
a
r
g
e
s
c
a
l
e
a
ppl
i
c
a
t
i
on
s
s
u
c
h a
s
bi
g da
t
a
.
B
u
t
t
h
e
pr
opos
e
d
f
r
a
m
e
w
o
r
k
u
s
ed
l
es
s
n
u
m
b
er
o
f
f
eat
u
r
es
t
h
at
r
ed
u
ce t
h
e p
er
f
o
r
m
an
ce o
f
f
r
a
m
e
w
o
r
k
.
K
ha
n
,
M
.
F
.
F
.
,
&
S
ak
a
m
u
r
a,
K
.
[
9
]
p
r
o
p
o
s
ed
a
c
o
n
t
ex
t
s
e
n
s
i
t
i
v
e
ap
p
r
o
ach
t
o
acces
s
co
n
t
r
o
l
t
h
a
t
d
ev
el
o
p
ed
o
n
co
n
v
en
t
i
o
n
al
R
o
l
e B
as
ed
A
cces
s
C
o
n
t
r
o
l
(
R
B
A
C
)
an
d
D
i
s
cr
et
i
o
n
ar
y
A
cce
s
s
C
o
n
t
r
o
l
(
D
A
C
)
.
I
n
ad
d
i
t
i
o
n
t
o
t
h
at
,
a f
i
n
e g
r
ai
n
e
d
acces
s
co
n
t
r
o
l
m
ec
h
an
i
s
m
i
s
p
r
opos
e
d t
o pe
r
s
on
a
l
h
e
a
l
t
h i
n
f
or
m
a
t
i
on
u
s
i
ng
eT
R
O
N
s
ecu
r
i
t
y
.
T
h
e eT
R
O
N
s
ec
u
r
i
t
y
ar
ch
i
t
ect
u
r
e
ad
v
o
c
at
e u
s
e o
f
t
a
m
p
er
r
es
i
s
t
an
t
c
h
i
p
s
eq
u
i
p
p
ed
w
i
t
h
f
u
n
ct
i
o
n
s
f
o
r
m
u
t
u
al
a
u
t
h
e
n
t
i
cat
i
o
n
an
d
en
cr
y
p
t
ed
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M
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B
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3
.
1
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F
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1
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R
EF
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ES
[
1]
Y
a
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g
, K
., H
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, Q
.
, L
i
, H
., Z
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, K
., S
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.
, &
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.
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-
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pol
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.
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I
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r
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hi
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s
J
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,
4
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2)
,
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3
-
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1,
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01
7.
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In
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A
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3193
[
2]
R
e
ddy
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.
B
.
A
c
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c
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or
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put
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N
F
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C
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M
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-
22,
20
13
.
[
3]
L
o
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g
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ta
f
f
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J
.
,
&
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o
b
le
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J
.
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ttr
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at
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, 5
8
-
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16
.
[
4]
A
ed
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.
,
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az,
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.
A
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4)
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-
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3,
200
6.
[
5]
B
hi
de
,
M
.
,
P
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n
de
y
,
S
.
,
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upt
a
,
A
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003
.
[
6]
A
m
ir
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,
P
illa
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,
&
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u
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F
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4.
[
7]
H
u
,
V
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C
.
,
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r
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ce,
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,
F
er
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ai
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.
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n
,
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.
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A
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or
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om
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1
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.
[
8]
H
u
a
n
g
, J
., N
i
c
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l
, D
.
M
., B
o
b
b
a
, R
., &
H
u
h
, J
. H
. A
f
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m
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w
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p
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s
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to
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le
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di
ngs
o
f
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pos
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,
187
-
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96,
20
12
.
[
9]
K
h
a
n
, M
.
F
. F
.
, &
S
a
k
a
m
u
r
a
, K
. (
2
0
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,
M
a
y
)
. F
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ai
n
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acce
s
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d
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n
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s
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5 I
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,
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5.
[
1
0]
K
uhn
,
D
.
R
.
V
u
l
ne
r
a
bi
l
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t
y
hi
e
r
a
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c
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(
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)
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11
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h Sy
m
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E
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-
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20
11
.
[
1
1]
G
u
p
t
a
, A
., P
a
n
d
h
i
, K
., B
i
n
d
u
,
P
.
V
., &
T
h
i
l
a
g
a
m
, P
. S
. (
2
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)
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a
n
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A
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s
s
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a
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d
d
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a S
eg
r
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r
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f
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D
at
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di
a T
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nol
og
y
,
24
,
15
50
-
15
57
.
[
1
2]
Z
e
n
g
, W
., Y
a
n
g
,
Y
., &
L
u
o
, B
. C
o
n
t
e
n
t
-
b
as
ed
acces
s
co
n
t
r
o
l
:
U
s
e d
at
a co
n
t
en
t
t
o
as
s
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s
t
acc
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s
co
n
t
r
o
l
f
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-
s
cal
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n
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t
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r
i
c d
at
ab
as
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.
I
n
B
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g D
at
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B
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g D
at
a)
,
2
01
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E
E
I
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r
n
at
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C
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o
n
I
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E
, 7
0
1
-
71
0,
201
4.
[
1
3]
R
a
j
poot
,
Q
.
M
.
,
J
e
ns
e
n,
C
.
D
.
,
&
K
r
i
s
h
na
n,
R
.
A
t
t
r
i
b
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nc
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d
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ol
e
-
b
as
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acces
s
co
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t
r
o
l
m
o
d
el
.
I
n
I
nt
e
r
nat
i
o
nal
C
on
f
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on T
r
us
t
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d P
r
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v
ac
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ne
s
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pr
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ng
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r
I
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r
na
t
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l
P
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s
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ng
,
3
-
1
7,
20
15.
Evaluation Warning : The document was created with Spire.PDF for Python.