I
nte
rna
t
io
na
l J
o
urna
l o
f
E
lect
rica
l a
nd
Co
m
p
ute
r
E
ng
in
ee
ring
(
I
J
E
CE
)
V
o
l.
10
,
No
.
1
,
Feb
r
u
ar
y
2020
,
p
p
.
396
~
406
I
SS
N:
2088
-
8708
,
DOI
: 1
0
.
1
1
5
9
1
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j
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e
.
v
10
i
1
.
pp
3
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6
-
406
396
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C
o
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s
p
o
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A
uth
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r
:
B
alik
a
J
.
C
h
ellia
h
,
Dep
ar
t
m
en
t o
f
C
o
m
p
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ter
Scie
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g
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SR
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I
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s
tit
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f
Sc
ien
ce
a
n
d
T
ec
h
n
o
lo
g
y
,
Ch
e
n
n
ai,
I
n
d
ia
.
E
m
ail:
j
b
alik
a
@
o
u
tlo
o
k
.
co
m
1.
I
NT
RO
D
UCT
I
O
N
A
Ser
v
ic
e
O
r
ien
t
e
d
A
p
p
r
o
a
c
h
p
r
o
v
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d
es
in
te
r
a
cti
o
n
s
w
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lo
o
s
e
ly
co
u
p
le
d
s
er
v
i
ce
s
th
at
o
p
e
r
at
e
in
d
e
p
en
d
en
t
ly
.
SOA
p
r
o
v
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d
es
s
er
v
ic
e
r
eu
s
e,
th
u
s
av
o
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g
s
tar
t
in
g
f
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m
th
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cr
atch
w
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p
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r
a
d
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d
m
o
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if
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n
e
e
d
e
d
.
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h
is
s
av
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s
ti
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d
m
o
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y
.
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h
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g
en
er
a
l
p
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ci
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l
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th
at
w
e
f
o
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lo
w
in
v
o
lv
e
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o
o
s
e
co
u
p
lin
g
;
m
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tain
in
g
m
in
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m
a
l
d
e
p
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d
en
cies
am
o
n
g
s
er
v
ice
s
an
d
o
n
ly
r
e
q
u
i
r
in
g
th
em
to
m
ain
tain
a
w
ar
en
ess
o
f
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th
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r
,
d
is
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ili
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p
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m
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s
er
v
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t
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a
ct;
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er
v
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s
an
d
c
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s
u
m
er
s
ad
h
er
e
to
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d
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in
e
d
ag
r
e
em
en
t
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eg
a
r
d
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g
s
er
v
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p
a
r
am
ete
r
s
an
d
QOS
.
C
o
m
p
o
n
en
ts
o
f
SOA
i
n
clu
d
e
s
er
v
i
ce
s
,
p
r
o
v
id
e
r
s
,
r
e
q
u
est
er
s
,
an
d
l
o
c
at
o
r
s
.
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d
o
f
p
r
o
v
i
d
in
g
l
ar
g
e
s
e
r
v
ices
t
o
n
u
m
b
er
o
f
c
o
n
s
u
m
er
s
le
ad
s
t
o
r
e
q
u
ir
e
th
e
w
eb
s
er
v
i
ce
s
asy
n
ch
r
o
n
o
u
s
in
n
atu
r
e
.
T
h
e
w
ay
o
f
p
r
o
v
i
d
in
g
asy
n
ch
r
o
n
o
u
s
s
er
v
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s
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ce
th
e
c
o
m
m
u
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o
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h
ea
d
an
d
s
er
v
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ce
s
ca
n
b
e
ef
f
ec
tiv
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o
f
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ev
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in
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a
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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E
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&
C
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p
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n
g
I
SS
N:
2088
-
8708
S
ervice
s
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tio
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in
s
ervice
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ted
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r
ch
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in
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p
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a
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(
B
a
l
ika
J.
C
h
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)
397
B
y
m
ak
in
g
s
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v
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ca
lls
asy
n
ch
r
o
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o
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s
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it
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p
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v
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in
o
n
d
e
m
a
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d
en
v
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n
t
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v
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(
Qo
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to
co
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s
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m
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s
.
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d
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in
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ac
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d
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e
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w
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d
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s
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r
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b
y
th
e
w
a
y
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f
p
ass
in
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q
u
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t
m
ess
ag
e.
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n
t
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f
ac
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b
etw
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clien
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an
d
s
er
v
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c
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p
r
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b
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d
to
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est
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s
am
e
th
in
g
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t
o
b
e
m
o
n
ito
r
e
d
ef
f
ec
ti
v
ely
b
y
th
at
in
t
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f
ac
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.
T
h
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p
ap
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is
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r
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s
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ch
a
w
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y
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h
at
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2
c
o
n
tain
s
r
elate
d
w
o
r
k
,
S
ec
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n
3
s
tates
th
e
p
r
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p
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s
ed
s
y
s
te
m
a
n
d
it
s
ar
ch
itect
u
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tech
n
iq
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d
alg
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ith
m
S
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4
d
em
o
n
s
tr
ates
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ices
s
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tio
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tr
ate
g
y
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S
ec
tio
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s
h
o
w
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e
x
p
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m
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tal
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y
s
i
s
a
n
d
in
S
ec
tio
n
6
co
n
cl
u
s
io
n
a
n
d
f
u
t
u
r
e
w
o
r
k
h
as
b
ee
n
s
tated
.
2.
RE
L
AT
E
D
WO
RK
I
n
s
er
v
ice
o
r
ien
ted
ar
ch
itect
u
r
e
(
SO
A
)
,
s
er
v
ice
a
g
en
t
s
co
u
ld
d
is
co
v
er
n
u
m
er
o
u
s
s
er
v
ice
p
r
o
v
id
er
s
w
h
ic
h
g
i
v
es
s
i
m
ilar
f
u
n
ctio
n
w
it
h
d
is
s
i
m
ilar
q
u
alit
y
o
f
s
er
v
ice
(
Qo
S).
C
o
o
p
er
ativ
e
m
i
x
ed
s
tr
ateg
y
(
C
MS)
[
1
]
is
u
s
ed
to
tack
le
th
e
s
er
v
ice
s
elec
tio
n
p
r
o
b
lem
(
SS
P
)
o
f
ti
m
e
-
s
e
n
s
i
tiv
e
s
er
v
ices
e
x
h
a
u
s
tin
g
th
e
th
eo
r
y
o
f
g
a
m
e
s
t
h
at
s
o
lv
e
s
i
n
co
n
s
tan
t
-
s
u
m
n
o
n
-
co
o
p
er
ativ
e
n
-
p
er
s
o
n
d
y
n
a
m
ic
g
a
m
e.
MS
d
ea
ls
u
s
er
s
a
n
o
p
ti
m
ized
p
r
o
b
a
b
ilit
y
m
as
s
f
u
n
ctio
n
i
n
its
p
lace
o
f
a
d
eter
m
i
n
is
t
ic
ch
o
ice
to
c
h
o
o
s
e
an
a
p
p
r
o
p
r
iate
p
r
o
v
id
er
f
r
o
m
th
e
ca
n
d
id
ates
a
n
d
r
e
m
o
v
es
th
e
v
ar
iat
io
n
o
f
q
u
eu
e
le
n
g
t
h
,
an
d
in
cr
ea
s
e
t
h
e
w
h
o
le
p
er
f
o
r
m
a
n
ce
o
f
SO
A
s
ig
n
i
f
ica
n
tl
y
.
A
SO
A
m
o
d
elin
g
an
d
d
esig
n
g
r
o
u
n
d
ed
o
n
th
e
n
o
tio
n
o
f
s
er
v
ice
co
m
p
o
n
e
n
t
an
d
s
tan
d
ar
d
UM
L
m
o
d
eli
n
g
co
n
s
tr
u
cts
[
2
]
th
at
p
r
o
v
id
e
th
e
in
ter
f
ac
e
o
f
a
s
er
v
ice
co
m
p
o
n
en
t
w
o
r
k
s
b
etter
th
an
th
e
lis
t
o
f
o
p
er
atio
n
s
ig
n
at
u
r
es
to
s
tip
u
la
te
th
e
co
m
p
le
te
co
n
tr
ac
t
b
et
wee
n
t
h
e
s
er
v
ice
p
r
o
v
id
er
an
d
co
n
s
u
m
er
.
T
h
e
W
eb
s
er
v
ices
o
u
ts
o
u
r
cin
g
m
an
a
g
er
f
r
a
m
e
w
o
r
k
f
o
r
d
y
n
a
m
ic
b
u
s
in
es
s
p
r
o
ce
s
s
es
u
s
e
s
an
XM
L
-
b
ased
an
n
o
tatio
n
d
o
cu
m
en
t
is
s
u
g
g
ested
to
s
eiz
e
th
e
b
u
s
in
e
s
s
r
eq
u
ir
e
m
e
n
ts
a
n
d
u
s
ed
to
d
y
n
a
m
ical
l
y
p
r
o
d
u
c
e
q
u
est
s
cr
ip
t
s
f
o
r
a
p
r
o
g
r
ess
iv
e
W
eb
s
er
v
ices
d
i
s
co
v
er
y
e
n
g
i
n
e
to
ca
tc
h
W
eb
s
er
v
ices
f
r
o
m
UDDI
r
e
g
is
tr
ie
s
an
d
W
eb
s
er
v
ice
in
s
p
ec
tio
n
la
n
g
u
a
g
e
d
o
cu
m
e
n
ts
[
3
,
4]
.
Ser
v
ice
s
elec
tio
n
in
d
y
n
a
m
ic
e
n
v
ir
o
n
m
e
n
t
is
th
e
tr
ea
t
m
e
n
t
o
f
tech
n
iq
u
es
i
n
c
h
o
o
s
in
g
a
n
d
o
f
f
er
in
g
Q
u
alit
y
o
f
Ser
v
ice
s
(
Qo
S)
to
co
n
s
u
m
er
s
.
T
h
e
d
y
n
a
m
ic
n
at
u
r
e
o
f
w
eb
s
er
v
ices
is
ca
p
t
u
r
ed
b
y
a
n
e
n
v
ir
o
n
m
e
n
t
co
llecti
n
g
r
u
n
ti
m
e
i
n
f
o
r
m
atio
n
o
f
w
eb
s
er
v
ices.
Uti
lizin
g
t
h
e
s
tatu
s
es
,
av
ailab
ilit
y
e
s
ti
m
atio
n
o
n
d
y
n
a
m
ic
s
ca
le
[
5
]
is
p
r
o
p
o
s
ed
alo
n
g
w
it
h
m
u
lt
ip
le
Qo
S
cr
iter
ia's
s
u
c
h
as
co
s
t
an
d
p
er
f
o
r
m
a
n
ce
i
m
p
l
ies
Stat
u
s
I
d
en
tific
atio
n
b
ased
s
er
v
ice
s
elec
tio
n
.
T
h
e
k
e
y
r
eq
u
ir
e
m
e
n
ts
f
o
r
co
m
m
er
cial
s
er
v
ice
o
r
ien
ted
ar
ch
itect
u
r
es
[
6
]
w
it
h
s
tr
ict
late
n
c
y
r
eq
u
ir
e
m
en
ts
ar
e
d
etai
led
.
B
ased
o
n
t
h
is
,
r
ec
o
g
n
izi
n
g
th
e
ca
p
ab
ilit
ie
s
o
f
t
h
e
h
o
s
t
in
g
en
v
ir
o
n
m
e
n
t
a
n
d
ef
f
ec
ti
v
el
y
m
a
tch
i
n
g
t
h
o
s
e
f
o
r
th
e
w
a
n
ted
s
er
v
ic
e
co
n
f
i
g
u
r
atio
n
ar
e
r
eq
u
ir
ed
to
en
ab
le
h
o
s
ti
n
g
s
er
v
ices
w
it
h
s
tr
ict
Qo
S
r
eq
u
ir
e
m
e
n
ts
.
A
m
et
h
o
d
[
7
,
8]
to
g
at
h
er
co
n
tex
t
b
ased
d
ata
o
f
s
er
v
ice
p
r
o
v
id
er
s
is
g
iv
e
n
as
in
p
u
t
t
o
th
e
r
u
le
b
ased
s
y
s
te
m
a
n
d
ap
p
r
o
p
r
iaten
ess
o
f
ev
er
y
SP
is
o
b
tai
n
ed
as
o
u
tp
u
t
in
cl
u
d
in
g
r
ec
o
m
m
e
n
d
ed
s
tip
u
latio
n
s
r
eg
ar
d
i
n
g
t
h
eir
u
s
a
g
e
.
Ser
v
ice
O
r
ien
ted
A
r
c
h
itect
u
r
e
(
SO
A
)
w
h
ic
h
c
o
m
p
r
i
s
es
o
f
m
an
y
co
n
s
u
m
er
s
m
ee
t
s
w
it
h
r
eliab
ilit
y
a
n
d
a
v
ailab
ilit
y
p
r
o
b
le
m
.
A
s
er
v
ice
s
e
lectio
n
a
n
d
r
ep
licatio
n
b
ased
o
n
Qu
al
it
y
o
f
S
er
v
ice
(
Qo
S)
m
ec
h
an
i
s
m
[
9
]
is
ab
le
to
co
n
tr
o
l
s
er
v
ice
r
ep
lica
p
r
o
p
e
r
ly
i
n
o
r
d
er
to
,
in
cr
e
ase
s
er
v
ice
in
s
t
an
ce
,
s
er
v
ice
r
ep
licatio
n
is
a
d
o
p
ted
.
T
o
co
n
tr
o
l
th
e
s
elec
tio
n
an
d
r
ep
licat
io
n
o
f
s
er
v
ice,
t
h
i
s
p
ap
er
p
r
o
p
o
s
es.
T
h
u
s
t
h
e
s
y
s
te
m
i
s
ab
le
to
co
n
tr
o
l
s
er
v
ice
r
ep
lica
p
r
o
p
er
ly
an
d
f
o
r
ce
s
er
v
ice
d
is
t
r
ib
u
tio
n
f
o
r
ef
f
ec
t
in
g
r
eg
u
lar
c
o
n
s
u
m
er
as
f
e
w
as p
o
s
s
ib
le.
A
s
tate
o
f
ar
t
in
ter
ce
p
to
r
m
o
d
u
le
an
d
h
ig
h
l
y
p
r
o
b
ab
il
is
tic
q
u
e
u
e
m
a
n
a
g
e
m
e
n
t
tec
h
n
iq
u
e
ar
e
in
tr
o
d
u
ce
d
in
th
is
ch
ap
ter
.
T
h
e
lack
o
f
e
x
is
ti
n
g
v
alid
atio
n
s
y
s
te
m
t
h
at
is
o
lates
t
h
e
r
eq
u
est
v
alid
atio
n
f
r
o
m
s
er
v
ice
r
en
d
er
in
g
f
o
r
ce
s
t
h
e
q
u
eu
e
to
b
e
o
v
er
cr
o
w
d
ed
w
i
t
h
in
v
alid
ated
r
eq
u
ests
a
n
d
in
s
ec
u
r
e
h
it
s
[
1
0
-
15]
.
T
h
e
least
ef
f
o
r
t
to
th
e
v
al
id
atio
n
o
f
th
e
e
x
i
s
ti
n
g
s
y
s
te
m
leav
es
th
e
s
er
v
ice
p
r
o
v
id
er
in
s
ec
u
r
e
an
d
b
u
s
y
r
o
w
d
i
n
g
a
h
i
g
h
l
y
r
ated
s
er
v
ice
p
r
o
v
id
er
s
'
q
u
e
u
e
w
i
ll
d
ep
r
ec
ate
t
h
e
q
u
alit
y
o
f
s
er
v
ice
p
r
o
v
id
er
w
h
ic
h
i
s
m
ea
n
t
to
p
r
o
v
id
e
an
d
v
ice
v
er
s
a.
T
h
e
s
u
r
v
e
y
s
h
o
w
s
t
h
at
t
h
er
e
is
a
n
e
ed
f
o
r
s
u
ch
a
m
o
d
el
th
at
d
ea
ls
th
e
q
u
e
u
e
len
g
t
h
as
a
r
an
d
o
m
v
ar
iab
le
th
at
m
o
s
t li
k
el
y
c
h
o
o
s
es a
q
u
e
u
e
w
it
h
lo
wer
len
g
t
h
an
d
w
it
h
b
est e
f
f
o
r
t s
er
v
ice.
T
h
e
in
ter
ce
p
to
r
is
in
tr
o
d
u
ce
d
to
h
av
e
an
ef
f
icie
n
t
f
lo
w
o
f
s
er
v
ice
w
it
h
o
u
t
a
n
y
w
eb
s
ec
u
r
it
y
th
r
ea
t
s
u
c
h
as
p
ass
i
n
g
r
eq
u
ests
f
r
o
m
clien
ts
w
it
h
o
u
t
p
r
o
p
er
v
alid
atio
n
.
T
h
is
ap
p
r
o
ac
h
f
u
r
th
er
in
teg
r
ates
a
s
a
n
itizer
m
o
d
u
le
w
h
ic
h
d
is
ca
r
d
s
t
h
e
in
v
alid
r
eq
u
est
s
s
e
n
t
b
y
a
n
y
cli
en
t
an
d
p
r
o
m
o
tes
e
f
f
icie
n
c
y
[
1
6
-
20]
.
Fu
r
th
er
it
estab
lis
h
es
a
ti
m
e
-
s
e
n
s
iti
v
e
s
er
v
ice
w
i
th
m
in
i
m
u
m
w
aiti
n
g
ti
m
e
an
d
co
n
s
is
te
n
t
p
er
f
o
r
m
an
ce
i
n
q
u
alit
y
.
T
h
e
in
ter
ce
p
to
r
allo
w
s
a
v
alid
r
eq
u
est
to
h
it
t
h
e
s
er
v
ice
an
d
t
h
e
r
esp
o
n
s
e
w
il
l
b
e
g
iv
e
n
ac
c
o
r
d
in
g
l
y
.
I
n
ca
s
e
o
f
an
y
d
e
la
y
th
e
i
n
ter
ce
p
to
r
d
u
l
y
in
ti
m
ate
s
th
e
clie
n
t a
n
d
th
e
cli
en
t
w
ill b
e
k
ep
t p
o
s
ted
in
ti
m
e
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2088
-
8708
I
n
t J
E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
10
,
No
.
1
,
Feb
r
u
ar
y
2
0
2
0
:
396
-
406
398
3.
ARCH
I
T
E
C
T
UR
E
O
F
Q
o
S
I
M
P
RO
VIS
AT
I
O
N
A
T
Q
U
E
UE
L
E
VE
L
I
n
ter
ce
p
to
r
an
d
p
r
o
b
ab
ilis
tic
ap
p
r
o
ac
h
attem
p
t
s
to
d
esig
n
an
ef
f
icie
n
t
f
lo
w
o
f
s
er
v
ice
w
it
h
o
u
t
an
y
w
eb
s
ec
u
r
it
y
th
r
ea
t
s
.
As
it
d
ec
o
u
p
les
th
e
s
an
i
tizer
m
o
d
u
le
f
r
o
m
t
h
e
s
er
v
ice
p
r
o
v
id
er
,
th
e
o
v
er
all
b
u
r
d
en
i
n
w
eb
s
er
v
ice
p
r
o
v
id
er
is
r
ed
u
ce
d
co
n
s
id
er
ab
ly
[
2
1
-
25]
.
T
h
is
ap
p
r
o
ac
h
estab
lis
h
e
s
a
tim
e
s
e
n
s
iti
v
e
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er
v
ice
w
it
h
m
i
n
i
m
u
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g
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e
a
n
d
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n
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ten
t
p
er
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m
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ce
.
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n
t
h
e
ar
ch
itec
tu
r
e
d
ep
icted
in
Fig
u
r
e
1
,
th
er
e
is
th
e
p
r
o
b
ab
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m
o
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el
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tes
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est
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t
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l
w
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y
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ie
s
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er
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eq
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est
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u
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e
w
h
i
ch
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s
m
i
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h
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n
o
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lized
p
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b
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ilis
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m
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el.
On
ce
t
h
e
r
eq
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e
s
t
i
s
ta
k
en
o
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t
f
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o
m
t
h
e
q
u
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e,
it
i
s
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eli
v
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ed
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e
in
ter
ce
p
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th
a
t
h
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al
id
atio
n
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n
d
s
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it
izatio
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m
o
d
u
le.
Fig
u
r
e
1
.
A
r
ch
itectu
r
e
o
f
s
er
v
i
ce
d
eliv
er
y
w
it
h
i
n
ter
ce
p
to
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an
d
p
r
o
b
ab
ilis
tic
ap
p
r
o
ac
h
R
eg
i
s
tr
atio
n
o
f
s
er
v
ice
r
eq
u
e
s
to
r
,
Sig
n
at
u
r
e
&
I
P
Ver
if
icat
io
n
,
A
tte
m
p
ts
C
h
ec
k
an
d
Sa
n
itizer
ar
e
th
e
p
r
o
ce
s
s
es
i
n
i
n
ter
ce
p
to
r
m
o
d
u
le.
T
h
e
m
o
ti
v
atio
n
b
e
h
i
n
d
th
e
i
n
ter
ce
p
to
r
m
o
d
u
le
is
t
o
is
o
late
th
e
r
eq
u
est
v
alid
atio
n
f
r
o
m
t
h
e
s
er
v
ice
p
r
o
v
id
er
.
T
h
is
ar
ch
itect
u
r
e
s
h
o
w
n
i
n
Fig
u
r
e
2
w
i
ll
co
m
p
lete
l
y
allo
w
th
e
in
ter
ce
p
to
r
to
b
e
f
u
n
ctio
n
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n
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ep
en
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en
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er
en
tl
y
w
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th
t
h
e
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er
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ice
p
r
o
v
id
e
r
.
T
h
u
s
it
r
ed
u
ce
s
th
e
b
u
r
d
en
o
f
th
e
s
er
v
ice
p
r
o
v
id
er
to
a
g
r
ea
ter
ex
te
n
t.
T
h
e
s
er
v
ice
p
r
o
v
id
e
r
n
e
v
er
k
ee
p
s
an
y
ch
o
r
es
e
x
ce
p
t
th
e
co
r
e
b
u
s
in
e
s
s
i
n
h
an
d
.
T
h
e
r
o
u
n
d
tr
ip
ti
m
e
w
ill b
e
s
ta
m
p
ed
alo
n
g
w
it
h
th
e
s
er
v
ice
r
ep
l
y
.
Fig
u
r
e
2
.
I
n
ter
ce
p
to
r
m
o
d
u
le
p
r
o
ce
s
s
v
alid
r
eq
u
est
s
in
w
eb
s
er
v
ice
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
E
lec
&
C
o
m
p
E
n
g
I
SS
N:
2088
-
8708
S
ervice
s
elec
tio
n
in
s
ervice
o
r
i
en
ted
a
r
ch
itectu
r
e
u
s
in
g
p
r
o
b
a
b
ilis
tic
a
p
p
r
o
a
ch
a
n
d
...
(
B
a
l
ika
J.
C
h
ellia
h
)
399
3
.
1
.
I
P
r
eg
is
t
ra
t
io
n
T
h
e
r
eq
u
est
T
im
e
(
lo
g
in
ti
m
e
o
f
th
e
r
eq
)
is
a
n
e
w
ta
g
w
h
ich
is
en
clo
s
ed
f
o
r
th
i
s
an
d
in
cl
u
d
es
T
o
k
en
th
at
ta
k
es
v
alu
e
s
f
r
o
m
0
to
1
,
Sig
n
at
u
r
eT
o
k
en
ST
clien
t
.
I
t p
er
f
o
r
m
s
t
h
e
r
eg
i
s
tr
atio
n
o
f
th
e
u
s
er
w
i
th
cr
ed
en
tia
ls
an
d
co
n
s
eq
u
e
n
t si
g
n
at
u
r
e
v
ali
d
atio
n
.
I
f c
o
n
ta
in
s
_
To
ke
n
== 0
Th
en
Do
R
eg
is
tr
a
tio
n
(
u
s
er_
n
a
me,
p
w
d
)
;
E
ls
e
if c
o
n
ta
in
s
_
To
ke
n
== 1
Do
Sig
n
at
u
r
e
_
Valid
atio
n
(
u
s
er
_
n
a
m
e,
p
w
d
,
S
Tclien
t
)
Do
R
eg
is
tr
a
tio
n
(
u
s
er_
n
a
me,
p
w
d
)
W
h
ile
(
Lo
g
in
_
I
P
:
LIP
,
Lo
g
in
_
T
ime:
LT
,
To
ke
n
/s
ee
d
,
)
{
Gen
era
te
To
ke
n
A
p
p
en
d
s
LT
,
LIP
a
n
d
To
ke
n
/
s
ee
d
in
w
h
itelis
t
}
T
h
e
cr
y
p
to
g
r
ap
h
icall
y
p
r
o
tecte
d
p
s
eu
d
o
r
an
d
o
m
n
u
m
b
er
p
r
o
d
u
ce
r
g
en
er
a
tes
th
e
to
k
e
n
an
d
th
e
w
h
iteli
s
t
i
s
p
o
p
u
lated
w
it
h
eit
h
er
th
e
to
k
e
n
o
r
s
ee
d
.
T
h
e
to
k
en
is
o
b
tain
ed
b
y
t
h
e
clie
n
t
wh
ich
ca
lcu
late
s
t
h
e
Sig
n
at
u
r
e_
T
o
k
en
as f
o
llo
w
s
:
S
ig
n
a
tu
r
e_
To
ke
n
is
co
mp
u
ted
b
y
th
e
MD5
a
l
g
o
r
ith
m
w
ith
To
ke
n
a
n
d
p
w
d
a
s
p
a
r
a
mete
r
s
.
W
h
ite
lis
t
m
a
y
f
u
r
t
h
er
co
m
p
r
i
s
es
ad
d
itio
n
al
attr
ib
u
te
s
lik
e
u
s
er
n
a
m
e,
p
ass
w
o
r
d
,
T
im
e
s
ta
m
p
s
k
e
w
–
T
SS
,
No
o
f
A
tte
m
p
t
s
–
No
A
,
T
h
r
esh
o
ld
li
m
it
–
T
L
,
I
n
ter
v
a
l
–
I
T
,
L
ast
R
eq
u
est
T
i
m
e
–
L
R
T
.
T
h
e
d
ef
au
lt
to
k
en
v
a
lid
it
y
is
1
2
h
o
u
r
s
an
d
it
w
il
l
ex
p
ir
e
in
ca
s
e
o
f
No
A
e
x
ce
ed
in
g
th
e
t
h
r
esh
o
ld
.
Usi
n
g
a
s
ig
n
a
tu
r
e
T
o
k
en
is
b
etter
t
h
a
n
t
h
e
co
n
v
e
n
tio
n
al
au
t
h
e
n
ticatio
n
s
c
h
e
m
es,
w
h
ic
h
aid
s
in
d
ea
lin
g
o
f
D
OS.
Alt
h
o
u
g
h
,
o
cc
u
r
r
en
ce
s
o
f
th
e
d
e
m
an
d
s
ar
e
a
u
g
m
e
n
t
ed
b
y
t
h
e
in
v
ad
er
,
it
is
co
n
s
t
r
ain
ed
th
at
t
h
e
m
ar
k
/
k
er
n
el
w
o
u
ld
s
ta
n
d
u
s
ab
le
s
i
m
p
l
y
f
o
r
t
h
e
s
p
ec
if
ied
a
m
o
u
n
t o
f
p
er
io
d
o
r
u
n
til it
’
s
ali
v
e.
3
.
2
.
I
nte
rc
ept
o
r
m
o
du
le
a
lg
o
rit
hm
T
h
e
in
v
alid
r
eq
u
est
an
d
co
r
r
esp
o
n
d
in
g
er
r
o
r
m
es
s
ag
e
ar
e
s
e
n
t
b
ac
k
to
th
e
clien
t.
Her
e
f
o
r
th
e
s
i
g
n
at
u
r
e
v
er
i
f
icatio
n
m
o
d
u
le
MD
5
alg
o
r
it
h
m
is
u
s
ed
th
at
ta
k
es
to
k
en
an
d
p
ass
w
o
r
d
as
p
ar
am
e
ter
s
to
g
en
er
ate
t
h
e
s
ig
n
at
u
r
e
to
k
en
as
s
ig
n
at
u
r
e
v
alid
atio
n
,
w
h
ich
tak
es
u
s
er
n
a
m
e
an
d
p
ass
w
o
r
d
an
d
g
iv
es
y
es
to
clien
t
co
n
s
id
er
ed
as
a
to
k
en
f
r
o
m
t
h
e
w
h
ite
lis
t.
W
h
ite
lis
t
g
iv
es
t
h
e
p
er
m
itted
to
k
e
n
s
a
n
d
b
lack
lis
t
li
s
ts
n
o
n
p
er
m
i
tt
ed
to
k
en
s
.
I
f
th
e
to
k
e
n
is
n
o
t
i
n
th
e
w
h
ite
li
s
t
th
e
r
eq
u
est
w
i
ll
b
e
d
en
ied
w
it
h
th
e
er
r
o
r
m
es
s
ag
e
o
th
er
w
is
e
s
e
n
t to
I
P
v
er
if
icatio
n
m
o
d
u
le.
3
.
3
.
Sig
na
t
ure
v
er
if
ica
t
io
n
I
t
v
alid
ates
th
e
a
u
t
h
e
n
ticit
y
o
f
th
e
clie
n
t
b
y
v
er
if
y
i
n
g
th
e
v
a
lu
e
i
n
t
h
e
Si
g
n
at
u
r
e_
T
o
k
en
tag
o
b
tain
ed
th
r
o
u
g
h
t
h
e
clie
n
t r
eq
u
est.
S
ig
n
a
tu
r
e_
V
a
lid
a
tio
n
(
u
s
er_
n
a
me,
p
a
s
s
w
o
r
d
,
S
Tclien
t)
{
1
.
C
o
n
s
u
m
ea
k
er
n
el
f
r
o
m
t
h
e
W
h
itelis
t
2
.
I
f
k
er
n
el
s
p
a
w
n
t
h
e
to
k
e
n
s
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2088
-
8708
I
n
t J
E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
10
,
No
.
1
,
Feb
r
u
ar
y
2
0
2
0
:
396
-
406
400
E
ls
e
if
T
o
k
en
Do
s
tag
e
n
u
m
b
er
3
3
.
STI
N
T
=
MD
5
(
p
w
d
+T
o
k
e
n
)
4
.
I
f
ST
clien
t =
ST
_
I
N
T
{
P
r
i
n
t su
cc
es
s
to
clien
t
Do
I
P_
v
er
f
icatio
n
(
I
P
clien
t)
}
E
ls
e
{
P
r
in
t th
e
Un
ac
ce
p
tab
le
Des
ir
es o
f
f
a
u
lt d
is
p
atc
h
}
}
T
h
e
ch
o
ice
o
f
ch
o
o
s
i
n
g
a
h
a
s
h
alg
o
r
it
h
m
li
k
e
MD
5
is
tr
a
n
s
f
o
r
m
i
n
g
t
h
e
ca
l
c
u
lat
io
n
s
i
m
p
ler
t
h
an
r
etain
in
g
a
p
air
o
f
p
r
iv
ate
an
d
p
u
b
lic
k
e
y
s
t
h
a
t a
r
e
en
cr
y
p
ted
b
y
a
f
u
r
t
h
er
cr
y
p
to
g
r
ap
h
ic
al
g
o
r
ith
m
.
3
.
4
.
I
P
v
er
if
ica
t
io
n
I
t
ch
ec
k
s
w
h
et
h
er
t
h
e
I
P
ad
d
r
ess
o
f
clie
n
t
is
v
al
id
b
y
u
s
in
g
eith
er
w
h
itel
is
t
o
r
b
lack
li
s
t.
T
h
e
b
lac
k
lis
t
h
o
ld
s
a
s
et
o
f
clien
t
’
s
I
P
ad
d
r
ess
th
at
m
ad
e
th
r
ea
t
to
th
e
s
er
v
ice
p
r
o
v
id
er
.
I
n
I
P
v
er
if
i
ca
tio
n
,
f
ir
s
t
s
tep
is
s
ig
n
at
u
r
e
v
alid
atio
n
w
h
ich
is
f
o
llo
w
ed
b
y
I
P
v
er
if
icat
io
n
m
o
d
u
le.
C
o
n
s
id
er
in
g
I
P
w
h
ite
l
is
t
an
d
b
lac
k
L
is
t,
an
y
I
P
w
h
ic
h
is
in
t
h
e
w
h
ite
li
s
t
w
i
ll
b
e
al
lo
w
ed
o
th
er
w
i
s
e
it
w
ill
b
e
d
ec
lin
ed
.
I
f
I
P
ad
d
r
ess
is
i
n
I
P
w
h
ite
lis
t
an
d
n
o
t
in
t
h
e
I
P
b
lack
lis
t
th
e
n
it
is
a
s
u
cc
ess
,
it
i
s
an
o
th
er
w
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s
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in
v
alid
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est.
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m
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t
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d
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atte
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f
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r
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i
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m
e
is
g
r
ea
ter
th
a
n
t
h
e
co
n
s
ta
n
t
t
i
m
e
(
allo
w
ed
t
i
m
e)
th
e
n
th
e
r
eq
u
est
w
i
ll b
e
in
v
alid
.
I
P
_
V
erfi
ca
tio
n
(
I
P
clien
t)
{
1
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A
s
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u
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t.
2
.
I
fI
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p
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3
.
5
.
E
f
f
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rt
s
p
la
id
A
cc
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s
s
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g
d
e
m
a
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d
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o
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th
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s
p
ec
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p
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d
o
f
v
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lu
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ass
o
ciate
d
w
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th
th
e
i
n
f
o
r
m
atio
n
d
ep
en
d
s
p
r
o
ce
ed
in
g
w
i
th
f
o
llo
w
in
g
li
m
itatio
n
s
.
a.
R
ef
er
e
n
ce
s
o
f
t
i
m
e
s
m
u
s
t b
e
r
ep
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ted
in
s
ta
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d
ar
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o
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at
(
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b.
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h
e
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ec
o
m
m
e
n
d
ed
ti
m
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r
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n
ce
s
s
h
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b
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in
X
m
l
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m
a
Def
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itio
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ate
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f
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m
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alu
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m
u
s
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b
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s
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c.
T
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TS
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limit fo
r
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d
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t.
I
T
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p
ermitt
ed
time
g
a
p
fr
o
m
L
T
to
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RT
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l
ika
J.
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h
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m
p
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LT
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3
.
6
.
Sa
nitize
r
T
h
e
s
ch
e
m
a
ca
c
h
i
n
g
p
r
o
ce
s
s
is
m
ai
n
tai
n
ed
b
y
th
e
s
an
i
tiz
er
w
h
ich
i
s
th
e
p
r
o
ce
s
s
o
f
m
ai
n
tai
n
in
g
in
d
ig
e
n
o
u
s
r
ep
licas
o
f
t
h
e
r
ep
r
esen
tatio
n
.
S
y
s
te
m
ca
n
b
e
s
u
p
p
o
s
ed
to
b
e
u
p
d
ated
r
eg
u
lar
l
y
w
h
e
n
t
h
er
e
i
s
a
n
y
ch
an
g
e.
T
h
is
s
a
n
itizer
ca
n
b
e
ea
s
il
y
m
an
ip
u
lated
w
i
th
th
e
h
elp
o
f
n
a
m
e
s
p
ac
e
p
ar
tic
u
lar
l
y
n
a
m
i
n
g
th
e
f
o
ld
er
s
.
On
co
n
s
id
er
in
g
t
h
e
s
c
h
e
m
a,
t
h
e
u
n
r
estra
i
n
ed
in
c
id
en
ce
m
u
s
t
b
e
li
m
ited
til
l
f
u
r
t
h
er
en
d
,
s
i
n
ce
th
a
t
is
t
h
e
m
ai
n
r
ea
s
o
n
f
o
r
co
er
civ
e
p
ar
s
in
g
a
tt
ac
k
.
T
h
u
s
,
th
e
s
e
i
n
cid
en
ts
w
o
u
ld
li
k
el
y
b
e
d
etain
ed
w
it
h
r
e
s
p
ec
t
to
th
e
k
in
d
o
f
ap
p
licatio
n
in
u
s
e.
A
s
n
a
m
esp
ac
e
in
j
ec
tio
n
attac
k
s
ar
e
lik
e
l
y
to
o
cc
u
r
an
ea
c
h
n
a
m
esp
ac
es
an
d
r
elate
d
tag
s
ar
e
m
o
n
ito
r
ed
an
d
th
ese
d
etails
ar
e
en
lis
ted
in
s
id
e
th
e
w
h
itel
is
t
i
n
o
r
d
er
t
o
p
r
o
v
id
e
au
th
en
tica
ti
o
n
.
T
h
e
p
r
ed
ef
in
ed
in
p
u
t
p
o
licie
s
o
f
t
h
e
p
o
r
ts
a
n
d
s
er
v
ice
s
s
h
o
u
ld
b
e
en
f
o
r
c
ed
s
o
th
at
i
m
p
r
o
v
ed
s
ec
u
r
it
y
w
i
ll
b
e
en
f
o
r
ce
d
.
T
h
e
XSD
P
ath
is
ex
tr
ac
ted
f
r
o
m
XM
L
f
o
r
m
o
f
s
er
v
ice
r
eq
u
est
a
n
d
ch
ec
k
ed
u
p
if
e
m
p
t
y
,
in
ca
s
e
t
h
e
v
a
lu
e
i
s
n
u
l
l,
t
h
e
r
eq
u
e
s
t
w
i
ll b
e
f
o
r
b
id
d
en
an
d
th
e
er
r
o
r
m
es
s
ag
e
w
ill
b
e
co
n
v
e
y
ed
to
t
h
e
c
lien
t to
a
v
o
id
t
h
e
p
ar
a
m
eter
ta
m
p
er
in
g
at
tack
.
Fu
r
t
h
er
t
h
e
th
r
es
h
o
ld
o
f
t
h
e
m
a
g
n
it
u
d
e
o
f
th
e
s
er
v
ice
r
eq
u
es
t
m
es
s
ag
e
i
s
en
f
o
r
ce
d
an
d
a
n
y
m
es
s
ag
e
th
a
t
ex
ce
ed
s
t
h
e
s
t
i
p
u
lated
s
ize
w
o
u
ld
b
e
r
ej
ec
ted
.
T
h
u
s
th
e
co
er
civ
e
p
ar
s
i
n
g
attac
k
i
s
h
an
d
led
.
T
h
er
ef
o
r
e
th
e
s
a
n
itizer
m
o
d
u
l
e
au
t
h
en
t
icate
s
t
h
e
d
ata
i
n
co
n
tr
ad
ictio
n
o
f
t
h
e
XM
L
s
tip
u
l
atio
n
s
a
n
d
u
p
h
o
ld
s
th
e
d
ata
co
r
r
ec
tn
ess
,
co
m
p
lete
n
es
s
an
d
s
tr
u
ctu
r
e.
3
.
7
.
Alg
o
rit
h
m
f
o
r
pro
ba
b
ili
s
t
ic
qu
eue
s
elec
t
io
n
T
h
e
p
r
o
b
ab
ilis
tic
ap
p
r
o
ac
h
ten
d
s
to
p
r
o
v
id
e
th
e
p
r
o
b
ab
i
lit
y
d
is
t
r
ib
u
tio
n
f
o
r
s
er
v
ice
s
elec
tio
n
.
I
t
is
u
s
e
f
u
l
i
n
ti
m
e
-
s
e
n
s
iti
v
e
s
er
v
ices.
P
r
o
b
ab
ilis
tic
ap
p
r
o
ac
h
e
n
s
u
r
es
b
es
t
m
a
n
ag
e
m
e
n
t
o
f
q
u
e
u
e
s
.
P
r
o
v
id
in
g
b
alan
ce
a
m
o
n
g
p
r
o
v
id
er
s
h
e
lp
s
r
etain
q
u
alit
y
p
ar
a
m
eter
f
o
r
f
u
r
t
h
er
s
e
g
m
e
n
t
s
.
User
s
s
e
n
d
th
e
r
eq
u
est
s
w
h
ic
h
w
il
l
b
e
d
is
tr
ib
u
ted
th
r
o
u
g
h
p
r
o
b
ab
ilis
tic
m
o
d
el
w
i
th
o
p
ti
m
a
l
q
u
eu
e
len
g
t
h
a
n
d
it
h
elp
s
y
o
u
to
c
h
o
o
s
e
th
e
les
s
cr
o
w
d
ed
q
u
eu
e
an
d
t
h
at
is
g
iv
e
n
to
th
e
in
ter
ce
p
to
r
s
w
h
ich
c
h
ec
k
s
t
h
e
r
e
g
is
tr
atio
n
a
n
d
v
er
i
f
ie
s
I
P
f
o
r
s
an
it
izatio
n
.
C
r
o
w
d
in
g
a
h
ig
h
l
y
r
ated
s
er
v
ice
p
r
o
v
id
er
s
'
q
u
eu
e
w
ill
d
ep
r
ec
ate
th
e
q
u
ali
t
y
th
at
t
h
e
s
er
v
ice
p
r
o
v
id
er
p
r
o
m
i
s
es to
p
r
o
v
id
e
an
d
v
ice
v
er
s
a
.
A
s
y
n
c
h
r
o
n
o
u
s
q
u
e
u
i
n
g
p
r
o
v
i
d
es
a
s
y
n
c
h
r
o
n
o
u
s
s
er
v
ice
ill
u
s
io
n
t
h
at
h
id
es
th
e
v
alid
atio
n
lo
g
ic
f
o
r
th
e
s
er
v
ice
ca
ll
in
to
a
s
h
ar
e
d
ca
ll
an
d
th
en
p
h
a
s
es
t
h
e
i
n
b
o
u
n
d
r
eq
u
es
t
o
n
a
s
er
v
ice
m
es
s
ag
e
q
u
e
u
e
f
o
r
p
r
o
ce
s
s
in
g
a
t
a
later
p
er
io
d
.
I
f
th
e
s
er
v
ice
r
eq
u
es
t
v
a
lid
ates
t
h
en
it
ca
n
b
e
p
lace
d
o
n
t
h
e
q
u
eu
e
f
o
r
p
r
o
ce
s
s
i
n
g
an
d
a
'
s
u
cc
es
s
'
r
esp
o
n
s
e
is
s
u
ed
to
th
e
r
eq
u
ester
i
m
m
ed
iat
el
y
.
A
f
ail
u
r
e
w
ill
ca
u
s
e
an
er
r
o
r
r
esp
o
n
s
e
to
th
e
s
er
v
ice
co
n
s
u
m
er
.
T
h
e
m
ess
a
g
e
i
s
t
h
en
ab
an
d
o
n
ed
a
n
d
n
o
t
p
lace
d
i
n
t
h
e
q
u
e
u
e.
B
o
th
t
h
e
r
eq
u
e
s
t
a
n
d
r
esp
o
n
s
e
o
p
er
atio
n
s
o
cc
u
r
in
d
ep
en
d
en
tl
y
a
n
d
th
u
s
p
r
o
v
id
e
b
o
th
th
e
s
er
v
er
to
r
etu
r
n
to
th
eir
co
r
e
p
r
o
ce
s
s
in
g
af
ter
s
e
n
d
i
n
g
a
r
eq
u
est
/r
esp
o
n
s
e
m
e
s
s
a
g
e.
T
h
e
y
ca
n
i
n
ter
ac
t
u
s
in
g
m
e
s
s
a
g
es
i
n
th
e
f
o
r
m
o
f
n
o
n
-
b
lo
ck
in
g
in
ter
r
u
p
ts
,
t
h
u
s
p
r
o
v
id
in
g
m
u
c
h
u
s
er
ex
p
er
ien
ce
.
4.
SE
RV
I
C
E
S S
E
L
E
C
T
I
O
N
S
T
RA
T
E
G
Y
I
n
s
er
v
ice
o
r
ien
ted
ar
ch
i
tec
tu
r
e,
s
er
v
ice
p
r
o
v
id
er
s
o
f
f
er
d
if
f
er
en
t
q
u
alit
y
o
f
s
er
v
ice
(
Qo
S),
th
u
s
t
h
e
y
en
co
u
n
ter
d
ec
is
io
n
co
n
f
lict
s
i
n
s
elec
tio
n
to
o
b
tain
an
o
p
ti
m
al
s
er
v
ice
q
u
alit
y
t
h
at
r
es
u
lt i
n
p
o
o
r
p
e
r
f
o
r
m
a
n
ce
.
4
.
1
.
P
ro
ble
m
w
it
h
pu
re
s
t
ra
t
eg
y
T
h
e
ar
r
iv
al
o
f
th
e
s
e
r
ies
o
f
s
er
v
ic
e
r
e
q
u
es
ts
th
at
c
o
m
e
to
w
eb
s
er
v
ice
en
v
i
r
o
n
m
e
n
t
f
o
llo
w
s
th
e
d
is
t
r
i
b
u
ti
o
n
o
f
Po
is
s
o
n
w
i
th
as
m
ea
n
ar
r
iv
a
l
r
ate
.
E
v
e
r
y
r
eq
u
est
o
f
u
s
e
r
is
m
ea
n
t
t
o
s
ele
ct
o
n
e
s
er
v
i
ce
p
r
o
v
i
d
e
r
am
o
n
g
th
e
m
p
ar
all
el
it
em
s
[
M
i
]
i
m
=1
f
o
r
f
in
is
h
in
g
th
e
d
em
an
d
s
.
T
h
e
u
s
er
s
p
a
r
es
T
p
ti
m
e
to
f
in
is
h
p
lan
n
in
g
r
o
u
t
in
es
s
u
ch
as
b
i
n
d
in
g
p
r
o
v
id
e
r
an
d
t
r
an
s
m
itti
n
g
d
at
a.
T
h
e
p
ar
am
eter
s
T
p
,
l,
an
d
μ
w
h
ich
ar
e
p
r
esu
m
ed
t
o
b
e
n
o
t
a
v
a
r
i
ab
le
d
u
r
in
g
th
e
q
u
eu
in
g
d
u
r
at
io
n
o
f
th
e
s
e
r
v
ic
e
r
e
q
u
ests
d
if
f
er
b
ased
o
n
th
ese
r
e
q
u
es
ts
an
d
r
es
p
o
n
s
es.
A
n
y
r
eq
u
est
j
n
ee
d
s
th
e
n
e
ce
s
s
ar
y
d
e
tai
ls
at
ti
m
e
t
o
f
s
er
v
i
ce
l
ev
el
p
a
r
am
eter
an
d
q
u
eu
e
len
g
th
f
r
o
m
th
e
b
r
o
k
er
b
ef
o
r
e
th
e
s
ele
cti
o
n
o
f
s
e
r
v
i
ce
p
r
o
v
id
e
r
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2088
-
8708
I
n
t J
E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
10
,
No
.
1
,
Feb
r
u
ar
y
2
0
2
0
:
396
-
406
402
T
h
e
n
o
n
-
p
r
o
b
a
b
il
is
ti
c
s
t
r
a
teg
y
J
is
t
o
s
ele
ct
th
e
s
e
r
v
ic
e
p
r
o
v
i
d
er
b
y
w
h
ich
th
e
r
eq
u
est
m
ig
h
t
an
tici
p
ate
to
b
e
c
o
m
p
lete
d
in
th
e
m
in
im
u
m
d
u
r
ati
o
n
:
I
n
o
r
d
e
r
t
o
an
tici
p
ate
th
e
r
e
q
u
est
t
o
b
e
co
m
p
le
te
d
w
ith
in
th
e
m
in
i
m
u
m
d
u
r
at
io
n
,
an
y
p
u
r
e
s
t
r
at
eg
y
is
s
el
ec
t
e
d
as f
o
ll
o
w
in
g
:
m
in
T
i
=
(
L
i
+
1
)
/
μ
i
B
y
ass
u
m
in
g
th
at
th
e
J
ch
o
o
s
e
s
th
e
s
e
r
v
ic
e
p
r
o
v
i
d
e
r
M
1
an
d
th
e
r
at
io
L
i
/
μ
i
w
h
er
e
,
L
1
/
μ
1
,
i
=2
,
3
,
.
.
.
,
m
at
t
.
Du
r
in
g
ev
a
lu
ati
o
n
o
f
ex
p
ec
t
ed
tim
e,
ev
er
y
r
eq
u
est
w
ill
ch
o
o
s
e
th
e
o
n
e
w
ith
th
e
l
o
w
est
ex
p
e
cte
d
tim
e.
C
o
n
s
id
er
in
g
th
e
tim
e
p
e
r
i
o
d
w
h
en
M
1
ac
q
u
i
r
es
th
e
p
o
s
iti
o
n
o
f
th
e
b
est
p
r
o
v
i
d
er
,
s
ay
D
t
j
u
s
t
b
ef
o
r
e
th
e
in
te
r
v
a
l
t,
th
e
r
e
q
u
est
o
r
s
o
f
th
e
s
e
r
v
ice
ar
e
in
c
o
m
in
g
w
h
ile
th
is
r
ec
es
s
m
u
s
t
h
av
e
co
m
p
let
ed
th
e
s
i
m
ilar
o
p
p
o
r
tu
n
ity
to
tie
M
1
.
S
im
ilar
q
u
ality
o
f
s
e
r
v
i
ce
is
n
o
t
d
eliv
e
r
e
d
w
h
en
th
e
q
u
eu
e
l
en
g
th
is
len
g
th
ie
r
th
an
th
e
q
u
eu
e
at
th
e
tim
e
J
a
r
r
iv
es
t
o
q
u
eu
e
o
n
tim
e
t+T
p
,
I
t
d
is
co
v
er
s
th
e
f
in
d
i
n
g
o
f
q
u
eu
e
is
le
n
g
t
h
ier
th
a
n
its
a
n
ti
cip
atio
n
an
d
it
m
a
y
n
o
t
d
eliv
er
th
e
s
i
m
ilar
q
u
alit
y
o
f
s
er
v
ice.
T
h
u
s
it
ca
u
s
es
p
e
r
io
d
ic
f
lu
ct
u
atio
n
i
n
t
h
e
q
u
e
u
e
len
gt
h
a
n
d
ca
u
s
e
s
a
d
r
asti
c
in
cr
ea
s
e
in
t
h
e
p
ea
k
q
u
eu
e
le
n
g
th
.
4
.
2
.
O
pti
m
izing
qu
a
lity
pa
ra
m
et
er
Ou
r
to
p
p
r
io
r
it
y
is
to
o
p
ti
m
iz
e
th
e
QOS
p
ar
a
m
eter
o
f
s
er
v
ice
q
u
e
u
es
s
o
as
to
p
r
o
v
id
e
a
r
etain
o
f
q
u
alit
y
o
f
t
h
e
s
er
v
ice
p
r
o
v
id
e
r
s
.
A
m
o
r
e
b
alan
ce
d
d
is
tr
ib
u
t
io
n
u
s
i
n
g
p
r
o
b
ab
ilis
tic
ap
p
r
o
ac
h
ca
n
d
r
asti
ca
ll
y
u
tili
ze
th
e
r
e
m
ai
n
i
n
g
s
er
v
ice
p
r
o
v
id
er
s
o
f
m
ed
io
cr
e
q
u
alit
y
p
ar
a
m
eter
as
w
ell
a
s
i
m
p
r
o
v
e
th
e
e
f
f
icie
n
c
y
o
f
b
est b
y
r
ed
u
ci
n
g
its
q
u
eu
e
p
ea
k
len
g
t
h
.
5.
E
XP
E
R
I
M
E
NT
A
L
RE
SUL
T
S
W
e
ar
e
c
o
n
s
id
er
in
g
t
h
r
ee
s
er
v
ice
p
r
o
v
id
er
s
w
h
ic
h
p
r
o
v
id
e
d
if
f
er
en
t
q
u
alit
y
p
ar
a
m
e
ter
w
it
h
t
h
e
to
p
o
n
e
p
r
o
v
id
in
g
th
e
b
est
q
u
alit
y
p
ar
a
m
eter
an
d
t
h
e
b
o
tto
m
o
n
e
p
r
o
v
id
in
g
least.
W
e
p
r
o
v
id
e
a
d
is
tr
ib
u
tio
n
o
f
s
er
v
ice
r
eq
u
est
s
u
s
i
n
g
p
r
o
b
ab
ilis
tic
ap
p
r
o
ac
h
to
ea
ch
o
f
th
e
s
er
v
ice
p
r
o
v
id
er
.
I
t
is
w
ell
n
o
t
ed
th
a
t
an
y
n
u
m
b
er
o
f
r
eq
u
est
m
a
y
ar
r
iv
e
at
a
p
ar
ticu
lar
in
ter
v
al
o
f
ti
m
e.
T
h
e
u
t
ilit
y
o
f
a
s
y
n
c
h
r
o
n
o
u
s
q
u
e
u
e
s
ca
n
f
u
r
th
er
p
r
o
v
id
e
i
m
p
r
o
v
e
th
e
u
s
er
r
esp
o
n
s
e
o
p
er
atio
n
.
5
.
1
.
Si
m
ula
t
io
n s
et
u
p
Fo
r
o
u
r
ea
s
e
o
f
e
v
alu
at
io
n
w
e
h
a
v
e
ch
o
s
e
n
3
s
er
v
ic
e
p
r
o
v
id
er
s
ea
ch
w
it
h
t
h
ei
r
d
ed
icate
d
as
y
n
ch
r
o
n
o
u
s
p
r
o
ce
s
s
i
n
g
w
it
h
th
e
f
ir
s
t
o
n
e
p
r
o
v
id
in
g
th
e
h
i
g
h
e
s
t
s
er
v
ice
q
u
a
lit
y
a
n
d
th
e
last
p
r
o
v
id
in
g
w
it
h
least
s
er
v
ice
q
u
al
it
y
.
T
h
u
s
to
ass
es
th
e
m
w
e
g
e
n
er
ate
a
r
a
tio
n
al
n
u
m
b
er
o
f
r
eq
u
e
s
ts
a
t
ev
er
y
i
n
ter
v
al
a
n
d
r
ec
o
r
d
th
e
r
eq
u
ests
d
is
tr
ib
u
t
i
o
n
as
w
ell
a
s
t
h
e
q
u
eu
e
len
g
th
o
f
th
e
p
r
o
v
id
er
s
.
Fi
g
u
r
e
3
s
h
o
w
t
h
er
eq
u
e
s
ts
d
is
tr
ib
u
tio
n
b
ased
o
n
QO
S p
ar
a
m
eter
.
T
o
f
u
r
th
er
ill
u
s
tr
ate
w
e
p
r
o
v
id
e
a
q
u
eu
e
le
n
g
t
h
d
is
tr
ib
u
t
io
n
l
in
e
o
f
s
er
v
ice
p
r
o
v
id
er
s
.
T
h
e
s
i
m
u
latio
n
is
ex
te
n
d
ed
w
i
th
t
h
e
f
u
r
t
h
er
s
e
tu
p
th
at
t
h
e
1
0
0
0
q
u
eu
es a
r
e
s
et
u
p
w
ith
i
ts
i
n
itial r
a
n
d
o
m
q
u
eu
e
le
n
g
th
o
f
m
ea
n
1
0
an
d
SD3
i
s
c
h
o
s
e
n
f
r
o
m
n
o
r
m
al
d
is
tr
ib
u
tio
n
.
T
h
e
w
eb
s
er
v
ice
r
eq
u
es
t
ar
r
iv
al
f
o
llo
w
s
t
h
e
e
x
p
o
n
e
n
tial
d
is
tr
ib
u
tio
n
.
Fig
u
r
e
3
.
R
eq
u
est
s
d
is
tr
ib
u
tio
n
b
ased
o
n
QOS
p
ar
a
m
eter
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
E
lec
&
C
o
m
p
E
n
g
I
SS
N:
2088
-
8708
S
ervice
s
elec
tio
n
in
s
ervice
o
r
i
en
ted
a
r
ch
itectu
r
e
u
s
in
g
p
r
o
b
a
b
ilis
tic
a
p
p
r
o
a
ch
a
n
d
...
(
B
a
l
ika
J.
C
h
ellia
h
)
403
A
t
a
n
y
m
o
m
e
n
t
to
en
q
u
e
a
s
er
v
ice
r
eq
u
est,
a
r
an
d
o
m
q
u
eu
e
len
g
t
h
is
ch
o
s
e
n
f
r
o
m
e
x
p
o
n
en
t
ial
d
is
tr
ib
u
tio
n
i
n
w
h
ic
h
la
m
b
d
a
v
alu
e
i
s
th
e
in
v
er
s
e
o
f
m
ea
n
q
u
eu
e
le
n
g
th
s
.
T
h
e
s
i
m
u
la
tio
n
s
ce
n
ar
io
is
s
et
to
b
e
Mo
n
te
-
C
ar
lo
s
i
m
u
latio
n
w
h
er
e
th
e
r
an
d
o
m
s
a
m
p
li
n
g
f
r
o
m
p
r
o
b
ab
i
lis
tic
d
is
tr
ib
u
t
io
n
i
s
p
r
esu
m
ed
to
h
av
e
a
r
ep
lica
o
f
r
ea
l
w
o
r
ld
.
A
m
ill
io
n
s
er
v
ice
r
eq
u
est
s
w
er
e
g
e
n
er
ated
an
d
th
e
g
r
o
w
t
h
s
o
f
th
e
q
u
eu
es
ar
e
r
ec
o
r
d
ed
af
ter
ev
er
y
1
0
0
0
r
eq
u
ests
.
5
.
2
.
Resul
t
s
a
n
d d
is
c
us
s
io
n
P
r
o
v
id
in
g
a
b
alan
ce
o
f
d
is
tr
ib
u
tio
n
o
f
r
eq
u
e
s
ts
a
m
o
n
g
t
h
e
p
r
o
v
id
er
s
h
elp
s
th
e
m
to
r
etain
t
h
eir
q
u
alit
y
p
ar
am
eter
f
o
r
f
u
r
th
er
s
eg
m
e
n
t
s
.
Mo
r
eo
v
er
it
also
m
ak
e
s
u
s
e
o
f
q
u
alit
y
o
f
o
th
er
q
u
e
u
es
th
an
s
i
m
p
l
y
tar
g
et
in
g
th
e
b
est
p
r
o
v
id
er
.
A
p
r
o
b
ab
ilis
tic
ap
p
r
o
ac
h
ca
n
en
s
u
r
e
th
e
b
est
m
a
n
ag
e
m
e
n
t
o
f
q
u
eu
e
s
an
d
ev
en
t
u
all
y
r
ed
u
ce
s
p
ea
k
q
u
eu
e
le
n
g
th
a
n
d
u
n
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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:
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I
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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t J
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C
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p
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I
SS
N:
2088
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8708
S
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t p
er
f
o
r
m
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n
ce
in
q
u
a
lit
y
.
RE
F
E
R
E
NC
E
S
[
1
]
T
e
m
g
li
t,
N.,
Ch
i
b
a
n
i,
A
.
,
Djo
u
a
n
i,
K.,
&
Na
c
e
r,
M
.
A
.
“
A
Dist
rib
u
te
d
A
g
e
n
t
-
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se
d
A
p
p
ro
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Op
ti
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b
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f
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jec
t
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o
re
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ra
p
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y
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”
IEE
E
S
y
ste
ms
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o
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r
n
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,
1
2
(2
),
1
6
5
5
–
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6
6
6
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o
i:
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1
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st.2
0
1
6
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2
6
4
7
2
8
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,
2
0
1
8
[
2
]
Zh
u
,
W
.
,
Yin
,
B.
,
G
o
n
g
,
S
.
,
&
Ca
i,
K.
-
Y.,
“
A
n
A
p
p
ro
a
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h
to
Web
S
e
rv
ice
s
S
e
lec
ti
o
n
f
o
r
M
u
lt
i
p
le
Us
e
rs,”
IEE
E
Acc
e
ss
,
5
,
1
5
0
9
3
–
1
5
1
0
4
.
d
o
i:
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ss
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2
0
1
7
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2
7
2
2
2
2
8
,
2
0
1
7
[
3
]
T
a
n
g
,
M
.
,
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e
n
g
,
Z.
,
Ka
n
g
,
G
.
,
L
iu
,
J.,
Ya
n
g
,
Y.,
&
Zh
a
n
g
,
T
.
“
Co
ll
a
b
o
ra
ti
v
e
W
e
b
S
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r
v
ice
Qu
a
li
ty
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re
d
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v
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Ex
p
lo
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g
M
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tri
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a
c
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ti
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tw
o
rk
M
a
p
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”
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r
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a
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3
(
1
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7
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2
5
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7
,
2
0
1
6
.
[
4
]
Ha
sh
m
i,
K.,
M
a
li
k
,
Z.
,
Err
a
d
i,
A
.
,
&
Re
z
g
u
i,
A
.
“
Qo
S
De
p
e
n
d
e
n
c
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M
o
d
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li
n
g
f
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r
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m
p
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site
S
y
st
e
m
s,”
IEE
E
T
ra
n
sa
c
ti
o
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s
o
n
S
e
rv
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s Co
mp
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t
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,
1
–
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o
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1
1
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c
.
2
0
1
6
.
2
5
8
9
2
4
4
,
2
0
1
6
.
[
5
]
S
a
lee
m
,
M
.
S
.
,
Di
n
g
,
C.
,
L
iu
,
X.,
&
Ch
i,
C.
-
H.
“
P
e
rso
n
a
li
z
e
d
De
c
isio
n
-
S
trate
g
y
b
a
se
d
W
e
b
S
e
rv
ic
e
S
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lec
ti
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si
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g
a
L
e
a
rn
in
g
-
to
-
Ra
n
k
A
lg
o
rit
h
m
,
”
IEE
E
T
ra
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sa
c
ti
o
n
s
o
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S
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rv
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s
Co
mp
u
ti
n
g
,
8
(5
),
7
2
7
–
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3
9
.
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o
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1
0
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1
1
0
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sc
.
2
0
1
4
.
2
3
7
7
7
2
4
,
2
0
1
5
.
[
6
]
Hu
,
Y.,
P
e
n
g
,
Q.
,
Hu
,
X
.
,
&
Y
a
n
g
,
R.
“
T
ime
Aw
a
re
a
n
d
Da
ta
S
p
a
rsity
T
o
lera
n
t
W
e
b
S
e
rv
ice
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c
o
m
m
e
n
d
a
ti
o
n
Ba
se
d
o
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m
p
ro
v
e
d
Co
ll
a
b
o
r
a
ti
v
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F
il
terin
g
,
”
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
S
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rv
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Co
m
p
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ti
n
g
,
8
(5
),
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8
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–
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.
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o
i:
1
0
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1
1
0
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sc
.
2
0
1
4
.
2
3
8
1
6
1
1
,
2
0
1
5
.
[
7
]
Rica
rd
o
J.
Ra
b
e
l
o
,
Ov
id
iu
N
o
ra
n
a
n
d
P
e
ter
Be
rn
u
s
,
“
T
o
w
a
rd
s
th
e
Ne
x
t
Ge
n
e
ra
ti
o
n
S
e
rv
ice
Orie
n
ted
E
n
terp
r
ise
A
rc
h
it
e
c
tu
re
,”
IEE
E
1
9
t
h
I
n
tern
a
t
io
n
a
l
E
n
terp
r
ise
Distrib
u
ted
Ob
jec
t
Co
m
p
u
ti
n
g
W
o
rk
sh
o
p
,
2
0
1
5
[
8
]
S
u
th
e
e
ra
P
u
n
t
h
e
e
ra
n
u
ra
k
,
"
S
O
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s
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lec
ti
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d
re
p
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c
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ti
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n
b
a
se
d
o
n
Qo
S
,
"
T
EN
CON
2
0
1
4
-
2
0
1
4
IEE
E
Re
g
io
n
1
0
Co
n
f
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re
n
c
e
,
2
0
1
4
.
[
9
]
S
a
u
ra
b
h
S
h
riv
a
sta
v
a
a
n
d
A
sh
ish
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h
a
rm
a
,
“
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n
a
p
p
ro
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c
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f
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r
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S
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se
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F
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lt
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c
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ig
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ra
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in
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rv
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A
rc
h
it
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tu
re
”
,
IEE
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In
ter
n
a
ti
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a
l
Co
n
fer
e
n
c
e
o
n
I
n
fo
rm
a
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S
y
ste
ms
a
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d
Co
mp
u
ter
Ne
two
rk
s
,
2
0
1
3
[
1
0
]
M
a
d
i
h
a
W
a
ris
,
Dr.
S
h
o
a
b
A
h
m
a
d
Kh
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n
a
n
d
M
u
h
a
m
m
a
d
Za
m
a
n
F
a
k
h
a
r,
“
F
a
c
to
rs
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ff
e
c
ti
n
g
S
e
rv
ice
Orie
n
ted
A
rc
h
it
e
c
tu
re
I
m
p
le
m
e
n
tatio
n
”
,
IE
EE
S
c
ien
c
e
a
n
d
In
f
o
rm
a
ti
o
n
C
o
n
f
e
re
n
c
e
,
2
0
1
3
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