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1
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s
taf
f
m
e
m
b
er
wh
o
ca
n
th
e
n
r
em
o
tely
co
n
tr
o
l
th
e
s
itu
atio
n
.
T
h
is
“
Hu
m
an
-
in
-
th
e
-
L
o
o
p
”
d
esig
n
en
s
u
r
es
th
at
au
to
m
atio
n
s
u
p
p
o
r
ts
,
r
ath
e
r
th
an
s
u
p
p
lan
ts
,
th
e
v
ital h
u
m
a
n
co
m
p
o
n
en
t
o
f
h
o
s
p
itality
.
T
h
e
m
ain
r
esear
ch
m
o
tiv
atio
n
f
o
r
th
e
d
e
v
elo
p
m
en
t
o
f
C
L
AR
A
i
s
f
u
n
d
am
en
tally
lin
k
ed
to
th
e
“
Au
to
m
atio
n
Par
a
d
o
x
”
th
at
h
as
b
ee
n
i
d
en
tifie
d
in
th
e
s
er
v
ice
s
ec
to
r
s
.
T
h
is
p
a
r
ad
o
x
a
r
g
u
es
th
at
as
s
y
s
tem
s
b
ec
o
m
e
m
o
r
e
an
d
m
o
r
e
au
t
o
m
ated
,
th
e
im
p
o
r
tan
ce
an
d
cr
iticality
o
f
th
e
r
em
ain
in
g
h
u
m
an
i
n
ter
ac
tio
n
s
b
ec
o
m
e
d
is
p
r
o
p
o
r
tio
n
ately
g
r
ea
ter
.
T
h
is
is
b
ec
au
s
e,
wh
en
r
o
u
tin
e
task
s
ar
e
d
eleg
ated
to
au
to
m
ated
s
y
s
tem
s
,
th
e
r
em
ain
in
g
h
u
m
a
n
task
s
ar
e
,
b
y
d
e
f
in
itio
n
,
m
o
r
e
c
o
m
p
lex
,
m
o
r
e
s
en
s
itiv
e,
an
d
m
o
r
e
cr
itical.
T
h
e
d
ev
elo
p
m
en
t
o
f
C
L
AR
A
is
b
ased
o
n
f
o
u
r
m
ai
n
m
o
tiv
ati
o
n
s
:
a.
E
co
n
o
m
ic
e
f
f
icie
n
cy
:
Ma
n
y
o
r
g
an
izatio
n
s
,
esp
ec
ially
s
m
all
an
d
m
ed
iu
m
e
n
ter
p
r
is
es
(
SME
s
)
,
co
-
wo
r
k
in
g
s
p
ac
es,
an
d
s
atellite
o
f
f
ices,
ca
n
n
o
t
ec
o
n
o
m
ically
ju
s
tify
t
h
e
n
ee
d
f
o
r
a
m
an
n
e
d
r
ec
ep
t
io
n
d
esk
2
4
×
7
.
C
L
AR
A
f
ill
s
th
is
g
ap
b
y
allo
win
g
a
s
in
g
le
r
em
o
te
s
taf
f
m
em
b
er
to
co
n
tr
o
l
m
u
ltip
le
f
r
o
n
t
d
esk
s
at
t
h
e
s
am
e
tim
e
th
r
o
u
g
h
a
ce
n
tr
ali
ze
d
Staf
f
Dash
b
o
a
r
d
.
T
h
is
“o
n
e
-
to
-
m
a
n
y
”
a
p
p
r
o
ac
h
g
r
ea
tly
r
ed
u
ce
s
c
o
s
ts
wh
ile
m
ain
tain
in
g
a
p
h
y
s
ical
p
r
esen
ce
.
b.
Op
er
atio
n
al
r
esil
ien
ce
:
Hu
m
an
s
taf
f
m
em
b
er
s
ar
e
p
r
o
n
e
to
b
io
lo
g
ical
n
ee
d
s
s
u
ch
as
illn
ess
,
b
r
ea
k
s
,
an
d
v
ac
atio
n
s
,
th
u
s
cr
ea
tin
g
p
o
ten
tial
s
in
g
le
p
o
in
ts
o
f
f
ailu
r
e
in
p
u
r
ely
h
u
m
an
-
s
taf
f
ed
s
y
s
tem
s
.
C
L
AR
A’
s
AI
lay
er
is
“a
lway
s
-
o
n
,
”
en
s
u
r
in
g
th
at
b
asic
s
er
v
ices
s
u
ch
as
ch
ec
k
-
i
n
an
d
FAQ
an
s
wer
in
g
ar
e
a
v
ailab
le
1
0
0
% o
f
t
h
e
tim
e,
th
u
s
en
s
u
r
in
g
b
u
s
in
ess
co
n
tin
u
ity
.
c.
T
ec
h
n
o
lo
g
ical
m
atu
r
ity
:
T
h
e
v
iab
ilit
y
o
f
s
u
ch
a
s
y
s
tem
h
as
o
n
ly
r
ec
en
tly
b
ee
n
m
ad
e
p
o
s
s
ib
le
th
r
o
u
g
h
th
e
co
n
v
er
g
en
ce
o
f
th
r
ee
k
ey
t
ec
h
n
o
lo
g
ies:
W
eb
R
T
C
f
o
r
en
ab
lin
g
b
r
o
wser
-
b
ased
,
p
lu
g
in
-
f
r
ee
v
id
e
o
co
m
m
u
n
icatio
n
;
lar
g
e
lan
g
u
ag
e
m
o
d
els
(
L
L
Ms)
f
o
r
n
atu
r
al
l
an
g
u
ag
e
u
n
d
e
r
s
tan
d
in
g
;
a
n
d
p
r
o
g
r
ess
iv
e
we
b
a
p
p
s
(
PW
As)
f
o
r
r
o
b
u
s
t,
cr
o
s
s
-
p
latf
o
r
m
d
ep
lo
y
m
en
t.
d.
User
e
x
p
er
ien
ce
(
UX)
g
a
p
:
T
h
e
cu
r
r
en
t
s
tate
o
f
th
e
m
a
r
k
et
f
o
r
v
is
ito
r
m
an
ag
e
m
en
t
is
d
is
jo
in
ted
.
Sy
s
tem
s
cu
r
r
en
tly
ex
is
t
as
eith
er
ad
m
in
is
tr
ativ
e
“Visit
o
r
m
an
ag
em
en
t
s
y
s
tem
s
”
(
e.
g
.
,
iPad
ap
p
s
f
o
r
s
ig
n
in
g
NDAs)
o
r
“Vid
eo
I
n
ter
co
m
s
”
(
e
.
g
.
,
R
i
n
g
d
o
o
r
b
ells
)
.
T
h
er
e
is
a
clea
r
a
b
s
en
ce
o
f
in
teg
r
ated
s
y
s
tem
s
th
at
b
r
in
g
to
g
eth
er
th
e
ad
m
in
is
tr
ativ
e
r
ich
n
ess
o
f
a
VM
S
an
d
th
e
co
m
m
u
n
icatio
n
im
m
e
d
iacy
o
f
a
n
in
ter
co
m
[
2
]
–
[
5
]
.
T
h
e
d
esig
n
o
f
th
e
h
y
b
r
id
r
ec
ep
tio
n
is
t
s
y
s
tem
is
f
ac
ed
with
a
n
u
m
b
er
o
f
n
o
n
-
tr
i
v
ial
en
g
in
ee
r
in
g
ch
allen
g
es,
wh
ich
th
is
r
esear
c
h
s
tu
d
y
s
ee
k
s
to
s
o
lv
e.
a.
Han
d
o
f
f
f
r
ictio
n
:
o
n
e
o
f
th
e
m
ajo
r
s
h
o
r
tco
m
in
g
s
o
f
cu
r
r
en
t
s
y
s
tem
s
i
s
th
e
f
r
ictio
n
t
h
at
ex
is
ts
wh
en
tr
an
s
itio
n
in
g
f
r
o
m
an
i
n
ter
ac
t
io
n
with
th
e
ch
atb
o
t
to
an
i
n
ter
ac
tio
n
with
th
e
h
u
m
an
r
ec
ep
tio
n
is
t.
T
h
is
f
o
r
ce
s
th
e
u
s
er
to
d
ial
a
d
if
f
e
r
en
t
n
u
m
b
er
o
r
wait
f
o
r
a
ca
l
lb
ac
k
,
th
u
s
d
is
r
u
p
tin
g
th
e
co
n
tin
u
ity
o
f
th
e
co
n
v
er
s
atio
n
.
T
h
e
s
ea
m
less
u
p
g
r
ad
e
o
f
a
tex
t
o
r
v
o
ice
c
o
n
v
er
s
atio
n
to
a
s
y
n
ch
r
o
n
o
u
s
v
i
d
eo
ca
ll
in
th
e
s
am
e
win
d
o
w
is
a
co
m
p
lex
s
ig
n
alin
g
an
d
s
tate
m
an
ag
em
e
n
t
p
r
o
b
lem
.
b.
Netwo
r
k
v
o
latilit
y
:
W
eb
R
T
C
-
b
ased
r
ea
l
-
tim
e
v
id
e
o
co
m
m
u
n
icatio
n
is
ex
tr
em
ely
s
en
s
itiv
e
to
p
ac
k
et
lo
s
s
an
d
laten
c
y
(
$
_
{
}
$
)
.
T
h
e
im
p
lem
e
n
tatio
n
o
f
r
eliab
le
v
id
eo
s
tr
e
am
in
g
in
th
e
we
b
b
r
o
wser
,
wh
ich
p
r
o
v
id
es
less
d
ir
ec
t
co
n
tr
o
l
o
v
er
th
e
n
etwo
r
k
s
tack
th
an
n
ativ
e
ap
p
licatio
n
s
,
is
a
co
m
p
lex
s
ig
n
alin
g
p
r
o
b
lem
t
h
at
r
eq
u
i
r
es
s
o
p
h
is
ticated
s
ig
n
alin
g
an
d
f
allb
ac
k
m
ec
h
an
is
m
s
to
en
s
u
r
e
q
u
a
lity
o
f
s
er
v
ice
(
Qo
S).
c.
Data
p
er
s
is
ten
ce
in
u
n
s
tab
le
en
v
ir
o
n
m
en
ts
:
Kio
s
k
s
th
at
ar
e
s
et
u
p
in
th
e
p
h
y
s
ical
lo
b
b
y
o
f
b
u
ild
in
g
s
m
a
y
u
s
e
W
i
-
Fi
co
n
n
ec
tiv
ity
th
at
i
s
co
n
g
ested
o
r
u
n
s
tab
le.
I
f
i
n
ter
n
et
co
n
n
ec
tiv
ity
is
lo
s
t,
t
h
e
ap
p
licatio
n
s
h
o
u
ld
n
o
t
cr
ash
o
r
d
is
p
lay
s
y
s
tem
er
r
o
r
s
.
I
t
s
h
o
u
ld
h
av
e
a
r
o
b
u
s
t
ar
ch
itectu
r
e
t
h
at
en
ab
le
s
it
to
d
eg
r
ad
e
g
r
ac
ef
u
lly
,
s
er
v
in
g
ca
c
h
ed
c
o
n
ten
t a
n
d
q
u
eu
in
g
d
ata
f
o
r
later
s
y
n
ch
r
o
n
izatio
n
.
d.
Secu
r
ity
o
f
s
ig
n
alin
g
:
I
n
o
r
d
er
to
estab
lis
h
a
p
ee
r
-
to
-
p
ee
r
(
P2
P)
co
n
n
ec
tio
n
,
clien
ts
n
e
ed
to
e
x
ch
an
g
e
n
etwo
r
k
i
n
f
o
r
m
atio
n
,
n
am
el
y
I
P
ad
d
r
ess
es
an
d
p
o
r
ts
,
in
th
e
f
o
r
m
o
f
in
ter
ac
tiv
e
co
n
n
ec
tiv
it
y
estab
lis
h
m
en
t
(
I
C
E
)
ca
n
d
id
ates.
T
h
is
ex
ch
an
g
e
n
ee
d
s
to
b
e
d
o
n
e
s
ec
u
r
ely
to
p
r
ev
en
t
th
e
e
x
p
o
s
u
r
e
o
f
th
e
in
ter
n
al
n
etwo
r
k
to
p
o
lo
g
y
to
p
o
ten
tial a
ttack
er
s
,
r
eq
u
ir
i
n
g
s
tr
ict
au
th
en
ticatio
n
an
d
en
cr
y
p
ti
o
n
p
r
o
to
co
ls
.
R
esear
ch
aim
an
d
o
b
jectiv
es
:
to
d
esig
n
,
e
n
g
in
ee
r
,
an
d
v
alid
ate
“CLARA,”
a
p
r
o
d
u
ct
io
n
-
g
r
a
d
e
Un
if
ied
Mo
n
o
r
ep
o
s
y
s
tem
th
at
o
p
er
ates
s
im
u
ltan
eo
u
s
ly
as
a
v
is
ito
r
-
f
ac
in
g
AI
k
io
s
k
an
d
a
s
taf
f
-
f
ac
in
g
m
an
ag
em
en
t
d
ash
b
o
a
r
d
,
f
ac
ili
tatin
g
ef
f
icien
t,
in
tellig
en
t,
an
d
h
u
m
a
n
-
ce
n
tr
ic
v
is
ito
r
m
an
ag
em
en
t.
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
-
8
7
0
8
C
LAR
A
:
A
u
n
ified
h
y
b
r
id
AI
-
h
u
ma
n
r
ec
ep
tio
n
is
t fra
mewo
r
k
u
s
in
g
Web
R
TC
and
…
(
D
h
a
n
u
s
h
S
r
id
h
a
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B
a
b
u
)
2771
Ob
jectiv
es o
f
th
e
p
r
o
ject
in
clu
d
e:
a.
Un
if
ied
AI
r
ec
ep
tio
n
is
t:
d
e
v
elo
p
a
s
y
s
tem
ca
p
ab
le
o
f
c
o
r
r
ec
tly
a
n
s
wer
in
g
g
en
er
al
a
n
d
s
p
ec
ialized
in
q
u
ir
ies
f
o
r
in
s
titu
tio
n
s
(
ad
m
is
s
io
n
s
,
tu
itio
n
,
s
ch
ed
u
les,
an
d
s
o
o
n
)
a
n
d
,
wh
en
n
ec
ess
ar
y
,
s
ea
m
less
ly
h
an
d
o
f
f
to
h
u
m
a
n
r
ep
r
esen
tativ
es th
r
o
u
g
h
r
ea
l
-
tim
e
v
id
eo
wi
th
o
u
t lo
s
in
g
c
o
n
tex
t.
b.
Mu
ltil
in
g
u
al
in
ter
ac
tio
n
:
o
f
f
e
r
r
o
b
u
s
t
m
u
ltil
in
g
u
al
ca
p
ab
il
ities
w
ith
s
p
ee
ch
-
to
-
tex
t
an
d
tex
t
-
to
-
s
p
ee
ch
f
u
n
ctio
n
ality
f
o
r
s
ix
p
r
o
m
in
en
t
I
n
d
ian
la
n
g
u
a
g
es:
E
n
g
li
s
h
,
Hin
d
i
,
T
elu
g
u
,
Kan
n
ad
a
,
T
am
il
,
an
d
Ma
lay
alam
.
c.
Staf
f
wo
r
k
f
l
o
w
o
p
tim
izatio
n
:
im
p
lem
en
t
r
eliab
le
s
taf
f
wo
r
k
f
lo
ws
f
o
r
s
ec
u
r
e
lo
g
in
,
p
r
es
en
ce
d
etec
tio
n
,
r
eq
u
est q
u
e
u
in
g
,
a
n
d
ca
ll st
ate
m
an
ag
em
e
n
t.
d.
E
x
ten
s
ib
ilit
y
:
p
lan
f
o
r
a
m
o
d
u
lar
f
r
am
ewo
r
k
with
h
o
o
k
s
f
o
r
s
im
p
le
ex
ten
s
io
n
o
f
f
u
t
u
r
e
f
u
n
ctio
n
alities
s
u
ch
as a
n
aly
tics
,
n
o
tific
atio
n
s
,
an
d
a
u
to
m
ated
p
r
o
ce
s
s
es.
2.
L
I
T
E
R
AT
U
RE
R
E
VI
E
W
T
h
is
r
ev
iew
o
f
liter
atu
r
e
ex
p
l
o
r
es
th
e
s
tate
o
f
t
h
e
ar
t
in
th
r
ee
r
elate
d
f
ield
s
:
co
n
v
er
s
atio
n
al
AI
,
r
ea
l
-
tim
e
web
co
m
m
u
n
icatio
n
(
W
eb
R
T
C
)
,
an
d
r
o
b
u
s
t
web
d
esig
n
.
T
h
r
o
u
g
h
a
n
an
aly
s
is
o
f
cu
r
r
en
t
liter
atu
r
e,
we
d
eter
m
in
e
th
e
tec
h
n
ical
u
n
d
e
r
p
in
n
in
g
s
o
f
th
e
C
L
AR
A
s
y
s
tem
an
d
th
e
ar
ea
s
in
wh
ich
c
u
r
r
en
t
s
y
s
tem
s
f
all
s
h
o
r
t,
an
d
t
h
u
s
wh
er
e
C
L
AR
A
ca
n
f
ill a
n
ee
d
.
2
.
1
.
E
v
o
lutio
n o
f
co
nv
er
s
a
t
i
o
na
l a
g
ent
s
in cus
t
o
m
er
s
er
v
ice
Au
to
m
ated
cu
s
to
m
e
r
s
er
v
ice
h
as
ev
o
lv
ed
th
r
o
u
g
h
g
en
e
r
atio
n
s
:
f
r
o
m
r
ig
id
,
r
u
le
-
b
ased
s
y
s
tem
s
to
f
lex
ib
le,
g
en
er
ativ
e
m
o
d
els.
Gen
er
atio
n
1
was
b
ased
o
n
m
en
u
-
d
r
i
v
en
in
ter
ac
tio
n
s
(
DT
M
F/B
u
tto
n
)
with
f
ew
o
p
tio
n
s
an
d
a
n
n
o
y
in
g
d
ee
p
m
en
u
s
.
Gen
er
atio
n
2
b
r
o
u
g
h
t
k
e
y
wo
r
d
-
m
atch
in
g
b
o
ts
(
E
L
I
Z
A
-
lik
e
)
th
a
t
s
u
p
p
o
r
ted
te
x
t
in
p
u
t
b
u
t
h
ad
h
ig
h
ab
a
n
d
o
n
m
en
t
r
ates
d
u
e
to
th
e
in
ab
ilit
y
to
p
r
o
ce
s
s
lo
n
g
-
tail
q
u
e
r
ies
—
co
m
p
lex
o
r
u
n
u
s
u
al
q
u
esti
o
n
s
b
ey
o
n
d
s
cr
ip
ted
r
esp
o
n
s
es.
Mo
r
e
r
ec
en
t
r
esear
ch
d
escr
i
b
es
co
n
tem
p
o
r
ar
y
ag
en
ts
as
eith
er
Gen
er
atio
n
3
o
r
“
co
n
tex
t
-
awa
r
e
g
en
er
ativ
e,
”
f
u
ele
d
b
y
lar
g
e
l
an
g
u
ag
e
m
o
d
els
(
L
L
Ms)
.
T
h
ese
m
o
d
els
em
p
lo
y
s
o
p
h
is
ticat
ed
n
atu
r
al
lan
g
u
a
g
e
p
r
o
ce
s
s
in
g
(
NL
P)
to
d
etec
t
in
ten
t
an
d
s
en
tim
en
t.
C
L
AR
A
f
o
llo
ws
th
is
th
ir
d
-
g
en
er
atio
n
m
o
d
el,
u
tili
zin
g
t
h
e
Go
o
g
le
Gem
in
i
API
f
o
r
n
atu
r
al
lan
g
u
ag
e
p
r
o
ce
s
s
in
g
.
I
t
in
c
o
r
p
o
r
ates
a
v
ital
Gen
er
atio
n
4
elem
en
t:
s
m
o
o
th
h
u
m
an
h
an
d
o
f
f
.
T
h
is
ar
ch
itec
tu
r
e
is
b
ac
k
ed
b
y
e
v
id
en
ce
th
at
p
u
r
e
AI
is
in
ad
e
q
u
ate
in
h
i
g
h
-
r
is
k
h
o
s
p
itality
ap
p
licatio
n
s
wh
er
e
n
u
an
ce
an
d
h
u
m
an
ju
d
g
m
en
t
ar
e
r
e
q
u
ir
ed
.
T
h
e
r
esear
ch
in
[
5
]
,
[
6
]
o
b
s
er
v
es
th
at
wh
ile
NL
P h
as im
p
r
o
v
ed
,
th
e
ab
s
en
c
e
o
f
an
escalatio
n
o
p
tio
n
r
em
a
in
s
a
p
r
im
ar
y
s
o
u
r
ce
o
f
u
s
er
d
i
s
s
ati
s
f
ac
tio
n
.
2
.
2
.
WebRT
C
a
nd
re
a
l
-
t
im
e
bro
wser
co
m
m
un
ica
t
io
n
W
eb
r
ea
l
-
tim
e
co
m
m
u
n
icatio
n
(
W
eb
R
T
C
)
h
as
em
er
g
e
d
a
s
th
e
g
lo
b
al
s
tan
d
ar
d
f
o
r
p
e
er
-
to
-
p
ee
r
au
d
io
,
v
id
e
o
,
an
d
d
ata
tr
an
s
f
e
r
d
ir
ec
tly
with
in
th
e
b
r
o
wser
,
with
o
u
t
th
e
n
ee
d
f
o
r
p
lu
g
in
s
.
A
co
m
p
r
eh
en
s
iv
e
AC
M
s
u
r
v
ey
in
2
0
2
2
,
“
W
eb
R
T
C
:
T
h
e
f
u
tu
r
e
o
f
b
r
o
wser
-
b
ased
co
m
m
u
n
icatio
n
,
”
d
escr
i
b
es
th
e
f
u
n
d
a
m
en
tal
p
r
o
to
co
ls
th
at
m
a
k
e
th
is
p
o
s
s
ib
le:
-
D
atag
r
am
tr
an
s
p
o
r
t la
y
er
s
ec
u
r
ity
(
DT
L
S):
Secu
r
es
th
e
d
ata
s
tr
ea
m
to
en
s
u
r
e
p
r
iv
ac
y
a
n
d
i
n
teg
r
ity
.
-
S
ec
u
r
e
r
ea
l
-
tim
e
tr
a
n
s
p
o
r
t
p
r
o
to
co
l
(
SR
T
P):
T
h
e
s
ec
u
r
e
p
r
o
t
o
co
l
f
o
r
tr
an
s
m
itti
n
g
au
d
io
an
d
v
id
e
o
o
v
er
I
P
n
etwo
r
k
s
.
-
I
n
ter
ac
tiv
e
co
n
n
ec
tiv
ity
estab
lis
h
m
en
t
(
I
C
E
)
:
Ass
i
s
ts
in
f
in
d
in
g
th
e
o
p
tim
al
p
ath
to
co
n
n
ec
t
two
p
ee
r
s
,
tr
av
er
s
in
g
NAT
s
an
d
f
i
r
ewa
lls
[
6
]
.
On
e
o
f
th
e
im
p
o
r
tan
t
d
esig
n
ch
o
ices
in
W
eb
R
T
C
,
as
d
esc
r
ib
ed
in
th
e
liter
atu
r
e,
is
th
at
W
eb
R
T
C
s
p
ec
if
ies
th
e
m
ed
ia
p
lan
e
(
v
id
eo
tr
an
s
m
is
s
io
n
)
b
u
t
d
o
e
s
n
o
t
s
p
ec
if
y
th
e
Sig
n
alin
g
p
lan
e
—
th
e
in
itial
h
an
d
s
h
ak
e
p
r
o
ce
s
s
in
wh
ic
h
p
ee
r
s
d
is
co
v
er
an
d
co
n
n
ec
t
to
e
ac
h
o
th
er
.
C
L
AR
A
r
em
ed
ies
th
is
b
y
em
p
l
o
y
in
g
a
cu
s
to
m
s
ig
n
alin
g
s
er
v
er
im
p
lem
en
ted
with
So
ck
et.
I
O.
T
h
is
allo
ws
f
o
r
lo
w
-
laten
cy
co
m
m
u
n
icatio
n
o
f
s
ess
io
n
d
escr
ip
tio
n
p
r
o
to
co
l
(
SDP)
m
ess
ag
es
an
d
I
C
E
ca
n
d
id
ates,
wh
ich
is
cr
itical
f
o
r
co
n
n
ec
ti
o
n
estab
lis
h
m
en
t
in
r
estrictiv
e
n
etwo
r
k
s
.
T
h
e
AC
M
s
u
r
v
ey
v
alid
ates
th
is
s
t
r
ateg
y
,
s
tatin
g
th
at
s
elf
-
m
an
ag
ed
s
ig
n
alin
g
ca
n
s
ig
n
if
ican
tly
lo
wer
laten
cy
co
m
p
ar
ed
to
th
ir
d
-
p
ar
ty
C
PaaS
s
er
v
ices.
2
.
3
.
H
u
m
a
n
-
in
-
t
he
-
lo
o
p (
H
I
T
L
)
wo
rk
f
lo
ws
R
esear
ch
o
n
h
u
m
an
-
in
-
th
e
-
lo
o
p
(
HI
T
L
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s
y
s
tem
s
,
as
p
r
ese
n
ted
in
th
e
r
esear
ch
p
ap
er
“
Hy
b
r
id
AI
-
h
u
m
an
wo
r
k
f
lo
ws
in
en
ter
p
r
is
e
”
(
Sp
r
in
g
er
,
2
0
2
4
)
,
i
n
d
icate
s
th
at
u
s
er
tr
u
s
t
in
AI
in
c
r
ea
s
es
wh
en
a
h
u
m
an
f
allb
ac
k
p
lan
is
v
is
ib
le
an
d
ea
s
ily
ac
ce
s
s
ib
le.
T
h
e
r
esear
ch
d
em
o
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tr
ated
th
at
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er
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ar
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4
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m
o
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e
lik
ely
t
o
in
ter
ac
t
with
an
AI
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tem
if
th
ey
ar
e
awa
r
e
th
at
a
h
u
m
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is
“
On
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click
awa
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T
h
is
in
f
o
r
m
s
th
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d
esig
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s
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s
er
in
ter
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wh
er
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“
C
all
Staf
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b
u
tto
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p
r
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m
in
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t
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n
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n
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t
b
u
r
ied
in
s
u
b
-
m
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.
T
h
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ap
p
r
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itizes
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e
v
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ilit
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o
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tem
lim
itatio
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s
,
p
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o
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id
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an
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m
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way
to
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ce
s
s
h
u
m
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in
tellig
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wh
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r
th
e
AI
c
o
n
f
id
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ce
lev
el
is
lo
w
[
7
]
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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:
2
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8
8
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I
n
t J E
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&
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,
Vo
l.
1
6
,
No
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3
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J
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20
2
6
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6
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1
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2
.
4
.
M
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la
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Mo
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in
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tead
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Po
ly
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class
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d
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s
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o
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twar
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v
elo
p
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R
eilly
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s
2
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id
e,
Mo
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ch
itectu
r
es
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o
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f
u
ll
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tack
s
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lab
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tates
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Dep
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Mism
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s
tack
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p
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t d
ev
elo
p
m
e
n
t
[
8
]
.
W
ith
th
e
clien
t,
s
er
v
er
,
an
d
s
h
ar
ed
lib
r
ar
ies
o
r
g
an
ize
d
in
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n
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r
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y
,
C
L
AR
A
m
ain
tain
s
co
n
s
is
ten
cy
in
d
ata
s
tr
u
ct
u
r
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lik
e
th
e
C
all
Ses
s
io
n
in
ter
f
ac
e
o
r
Au
th
Pay
lo
a
d
ty
p
e
ac
r
o
s
s
th
e
e
n
tire
s
tack
.
I
f
th
e
b
ac
k
e
n
d
API
s
ch
em
a
ch
an
g
es,
th
e
f
r
o
n
ten
d
b
u
ild
wil
l
im
m
ed
iately
f
ail,
av
o
id
in
g
r
u
n
tim
e
e
r
r
o
r
s
an
d
m
ain
tain
in
g
ty
p
e
co
r
r
ec
t
n
ess
th
r
o
u
g
h
o
u
t
th
e
d
ev
elo
p
m
en
t
p
r
o
ce
s
s
.
T
h
is
Sin
g
le
So
u
r
ce
o
f
T
r
u
th
is
v
ital
to
tr
u
s
two
r
th
y
s
ig
n
alin
g
lo
g
ic,
wh
er
e
an
in
co
m
p
atib
ilit
y
b
et
wee
n
th
e
SDP
p
ay
lo
ad
lay
o
u
t
co
u
ld
ca
u
s
e
ca
ll
f
ailu
r
es.
2
.
5
.
Securit
y
c
o
ncer
ns
in
W
ebSo
ck
et
s
ig
na
lin
g
Secu
r
ity
in
s
ig
n
alin
g
is
a
v
ital
asp
ec
t
o
f
W
eb
R
T
C
.
T
h
e
E
ls
ev
ier
J
o
u
r
n
al
o
f
I
n
f
o
r
m
atio
n
Secu
r
it
y
(
2
0
2
3
)
i
d
en
tifie
s
s
ig
n
alin
g
i
n
jectio
n
an
d
m
an
-
in
-
th
e
-
m
id
d
le
(
MI
T
M)
attac
k
s
as
s
ig
n
if
ican
t
th
r
ea
ts
in
W
eb
So
ck
et
s
ig
n
alin
g
.
C
L
AR
A
in
co
r
p
o
r
ates secu
r
ity
b
est p
r
ac
tices b
ased
o
n
th
ese
d
is
co
v
e
r
ies:
a.
W
eb
So
ck
et
s
ec
u
r
e
(
W
SS
)
:
A
ll
s
ig
n
alin
g
m
ess
ag
es
ar
e
tr
an
s
m
itted
o
v
er
a
T
L
S
-
e
n
cr
y
p
t
ed
co
n
n
ec
tio
n
,
s
af
eg
u
ar
d
in
g
th
e
SDP m
ess
ag
e
f
r
o
m
ea
v
esd
r
o
p
p
in
g
.
b.
T
o
k
en
-
b
ased
au
th
e
n
ticatio
n
:
T
h
e
So
ck
et
co
n
n
ec
tio
n
h
an
d
s
h
ak
e
p
r
o
ce
s
s
d
em
a
n
d
s
a
v
a
lid
J
SON
W
e
b
T
o
k
en
(
J
W
T
)
.
c.
R
o
o
m
is
o
latio
n
:
C
L
AR
A
u
s
es
So
ck
et.
I
O
R
o
o
m
s
to
co
m
p
l
etely
is
o
late
ca
ll
s
ess
io
n
s
,
p
r
ev
en
tin
g
u
s
er
s
f
r
o
m
ac
ce
s
s
in
g
r
o
o
m
s
th
e
y
ar
e
n
o
t
au
th
o
r
ized
to
jo
in
an
d
p
r
o
tectin
g
s
ig
n
alin
g
m
ess
ag
es
f
r
o
m
u
n
au
th
o
r
ized
ac
ce
s
s
.
2
.
6
.
L
a
t
ency
o
ptim
iza
t
io
n a
nd
o
f
f
lin
e
re
s
ilience
A
2
0
2
3
p
a
p
er
i
n
th
e
J
o
u
r
n
al
o
f
Netwo
r
k
an
d
C
o
m
p
u
ter
A
p
p
licatio
n
s
illu
s
tr
ates
th
e
im
p
o
r
tan
ce
o
f
laten
cy
o
p
tim
izatio
n
in
r
ea
l
-
tim
e
v
id
eo
c
o
m
m
u
n
icatio
n
b
y
f
av
o
r
i
n
g
UDP
(
u
s
in
g
W
eb
R
T
C
)
o
v
er
T
C
P
to
m
itig
ate
h
ea
d
-
of
-
lin
e
b
lo
ck
in
g
[
9
]
.
C
L
AR
A
f
o
llo
ws
th
i
s
b
est
p
r
ac
tice
b
y
en
ab
lin
g
p
ee
r
-
to
-
p
ee
r
UDP
s
tr
ea
m
s
.
Fu
r
th
er
m
o
r
e
,
W
eb
Dev
’
s
2
0
2
1
ar
ticle
o
n
Of
f
lin
e
-
First
W
eb
Ar
ch
itectu
r
es
f
o
r
Pu
b
lic
Kio
s
k
s
s
u
g
g
ests
im
p
lem
en
tin
g
th
e
Ap
p
Sh
ell
p
atter
n
an
d
Ser
v
ice
W
o
r
k
e
r
s
to
d
ea
l
with
u
n
r
eliab
le
n
etwo
r
k
s
.
C
L
A
R
A
f
o
llo
ws
th
is
b
est
p
r
ac
tice
b
y
c
atch
in
g
th
e
m
ain
UI
,
en
s
u
r
in
g
th
e
a
v
a
tar
r
em
ain
s
in
ter
ac
tiv
e
ev
en
w
h
en
th
e
b
ac
k
en
d
is
d
o
wn
tem
p
o
r
ar
ily
.
3.
P
RO
P
O
SE
D
SYS
T
E
M
A
RC
H
I
T
E
CT
U
RE
3
.
1
.
O
v
er
v
iew
o
f
hy
brid
a
rc
hite
ct
ure
C
L
AR
A
will
b
e
co
n
s
tr
u
cted
as
a
U
n
if
ied
C
o
m
m
u
n
icati
o
n
Sy
s
tem
c
o
n
s
is
tin
g
o
f
th
r
ee
h
ig
h
l
y
in
teg
r
ated
co
m
p
o
n
en
ts
:
th
e
C
lien
t
I
n
ter
f
ac
e
(
Vis
ito
r
Kio
s
k
)
,
th
e
Staf
f
Dash
b
o
ar
d
,
a
n
d
th
e
Un
if
ied
Ser
v
er
.
T
h
e
aim
is
to
in
teg
r
ate
au
to
m
ate
d
s
elf
-
s
er
v
ice
with
h
u
m
a
n
in
ter
ac
tio
n
.
a.
C
lien
t in
ter
f
ac
e
(
v
is
ito
r
k
io
s
k
)
1)
Platfo
r
m
: Reac
t 1
9
+
Vite
(
Pr
o
g
r
ess
iv
e
W
eb
Ap
p
)
2)
Har
d
war
e:
T
ab
let
o
r
to
u
ch
-
en
ab
led
k
io
s
k
3)
Fu
n
ctio
n
:
T
h
is
is
th
e
m
ain
v
i
s
ito
r
in
ter
ac
tio
n
p
o
in
t.
I
t
in
cl
u
d
es
an
a
n
im
ated
a
v
atar
f
o
r
g
r
ee
tin
g
u
s
er
s
an
d
in
c
o
r
p
o
r
ates
th
e
W
eb
Sp
e
ec
h
API
f
o
r
v
o
ice
r
ec
o
g
n
itio
n
.
I
t
ca
n
r
esp
o
n
d
to
FAQs
u
s
in
g
th
e
Go
o
g
le
Gem
in
i A
PI
an
d
m
ak
e
v
id
eo
c
alls
.
4)
Key
f
ea
tu
r
e
:
T
h
e
o
n
e
-
tap
v
id
e
o
ca
ll
c
h
an
g
es
t
h
e
UI
f
r
o
m
ch
at
to
a
f
u
ll
-
s
cr
ee
n
v
id
eo
m
ee
ti
n
g
with
o
u
t
lo
s
in
g
th
e
co
n
v
er
s
atio
n
co
n
tex
t.
b.
Staf
f
d
ash
b
o
ar
d
1)
Platfo
r
m
: Reac
t +
Vite
+
T
ailwin
d
C
SS
2)
Har
d
war
e:
Desk
to
p
,
lap
to
p
,
o
r
tab
let
co
m
p
u
ter
3)
Fu
n
ctio
n
: A
s
taf
f
m
an
a
g
em
en
t
d
ash
b
o
ar
d
f
o
r
s
ettin
g
av
ailab
i
lity
an
d
p
r
o
ce
s
s
in
g
in
co
m
in
g
r
eq
u
ests
.
4)
Key
Featu
r
es:
5)
T
im
etab
le
v
iew:
S
taf
f
m
em
b
er
s
ca
n
s
et
s
tatu
s
(
B
u
s
y
,
Av
ailab
le)
6)
No
tific
atio
n
ce
n
ter
:
R
eal
-
tim
e
n
o
tific
atio
n
s
f
o
r
in
co
m
in
g
ca
ll
s
u
s
in
g
W
eb
So
ck
ets
7)
Vid
eo
m
o
d
al:
A
p
o
p
-
u
p
win
d
o
w
f
o
r
ac
ce
p
tin
g
o
r
r
ejec
tin
g
ca
lls
an
d
d
is
p
lay
in
g
th
e
v
is
ito
r
'
s
ca
m
er
a
s
tr
ea
m
c.
Un
if
ied
s
er
v
er
1)
Platfo
r
m
: N
o
d
e.
js
+
E
x
p
r
ess
+
So
ck
et.
I
O
2)
Fu
n
ctio
n
: T
h
e
m
aster
c
o
o
r
d
in
atio
n
s
er
v
er
f
o
r
m
a
n
ag
in
g
d
ata
f
lo
w
an
d
s
tate
3)
Key
f
ea
tu
r
es:
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
-
8
7
0
8
C
LAR
A
:
A
u
n
ified
h
y
b
r
id
AI
-
h
u
ma
n
r
ec
ep
tio
n
is
t fra
mewo
r
k
u
s
in
g
Web
R
TC
and
…
(
D
h
a
n
u
s
h
S
r
id
h
a
r
B
a
b
u
)
2773
˗
API
g
atew
ay
: REST
API
s
f
o
r
Au
th
en
ticatio
n
(
/au
th
)
an
d
d
at
a
ac
ce
s
s
(
/time
tab
les)
˗
Sig
n
alin
g
s
witch
b
o
ar
d
:
W
eb
So
ck
et
n
am
esp
ac
es
f
o
r
r
o
u
tin
g
v
id
eo
co
n
n
ec
tio
n
in
f
o
r
m
atio
n
b
etwe
en
u
s
er
s
˗
Per
s
is
ten
ce
m
an
ag
er
:
Po
s
tg
r
eSQL
d
atab
ase
o
p
er
atio
n
s
with
f
ailo
v
er
s
u
p
p
o
r
t
f
o
r
d
ata
a
v
ailab
ilit
y
d
u
r
in
g
o
u
tag
es.
3
.
2
.
F
illi
ng
re
s
ea
rc
h g
a
ps
C
L
AR
A
i
s
d
esig
n
ed
to
f
ill s
p
ec
if
ic
r
esear
ch
g
ap
s
in
t
h
e
cu
r
r
e
n
t state
o
f
th
e
tech
in
d
u
s
tr
y
.
˗
Gap
1:
T
h
e
u
n
ca
n
n
y
v
alley
o
f
d
is
co
n
n
ec
ted
AI
.
Mo
s
t
k
io
s
k
s
ar
e
s
ilo
ed
,
an
d
wh
en
th
ey
d
o
n
o
t
r
ec
eiv
e
a
q
u
esti
o
n
,
th
e
y
leav
e
u
s
er
s
s
tu
ck
.
C
L
AR
A
clo
s
es
th
is
g
ap
w
ith
in
teg
r
ated
escalatio
n
.
T
h
e
AI
m
o
n
ito
r
s
its
o
wn
co
n
f
id
e
n
ce
lev
el.
W
h
en
f
r
u
s
tr
atio
n
o
r
lo
w
co
n
f
i
d
en
ce
ap
p
ea
r
s
,
it
au
to
m
atica
lly
p
r
esen
ts
th
e
“
C
all
Staf
f
”
b
u
tto
n
,
en
s
u
r
in
g
th
e
u
s
e
r
ex
p
er
ie
n
ce
r
em
ain
s
s
ea
m
less
an
d
f
r
u
s
tr
atio
n
-
f
r
ee
.
˗
Gap
2:
L
aten
cy
in
clo
u
d
-
b
ase
d
s
ig
n
alin
g
.
M
o
s
t
v
id
eo
-
b
ased
s
o
lu
tio
n
s
in
v
o
lv
e
th
ir
d
-
p
ar
ty
C
PaaS
p
r
o
v
id
er
s
(
s
u
ch
as
T
wilio
o
r
Ag
o
r
a)
,
in
cr
ea
s
in
g
laten
cy
a
n
d
co
s
ts
.
C
L
AR
A
clo
s
e
s
th
is
g
ap
with
s
elf
-
h
o
s
ted
s
ig
n
alin
g
.
B
y
h
o
s
tin
g
a
cu
s
to
m
So
ck
et.
I
O
s
er
v
er
,
th
e
laten
cy
o
f
s
ig
n
alin
g
r
e
m
ain
s
lo
w
—
u
s
u
ally
u
n
d
er
50
m
s
o
n
a
lo
ca
l n
etwo
r
k
—
an
d
elim
in
ates p
er
-
m
in
u
te
b
illi
n
g
ch
ar
g
es,
p
r
o
v
id
in
g
a
c
o
s
t
-
ef
f
ec
tiv
e
an
d
h
ig
h
-
p
er
f
o
r
m
an
ce
s
o
lu
tio
n
.
˗
Gap
3
:
Vu
ln
er
ab
ilit
y
o
f
d
ata
b
ase
-
d
ep
en
d
e
n
t
k
io
s
k
s
.
Mo
s
t
web
ap
p
licatio
n
s
f
ail
wh
en
th
ei
r
d
atab
ase
f
ails
,
an
d
d
is
p
lay
in
g
a
“Da
tab
ase
co
n
n
ec
tio
n
er
r
o
r
”
s
cr
ee
n
in
a
l
o
b
b
y
ca
n
d
am
ag
e
th
e
r
ep
u
tatio
n
o
f
an
in
s
titu
tio
n
.
C
L
AR
A
clo
s
es
th
is
g
ap
with
in
-
m
em
o
r
y
f
allb
ac
k
.
I
t
i
s
d
esig
n
ed
to
f
u
n
ctio
n
as
a
s
tatele
s
s
r
ela
y
wh
en
s
to
r
ag
e
f
ails
.
C
alls
ca
n
s
till
b
e
f
o
r
war
d
ed
b
ec
au
s
e
th
e
y
’
r
e
tr
an
s
ien
t,
s
o
th
e
p
r
i
m
ar
y
f
u
n
ctio
n
o
f
th
e
k
io
s
k
,
co
m
m
u
n
icatio
n
,
is
m
ain
tain
ed
ev
e
n
wh
en
l
o
g
g
in
g
is
lo
s
t.
˗
Gap
4
:
L
o
s
s
o
f
co
n
tex
t
d
u
r
in
g
h
u
m
an
h
an
d
o
f
f
.
On
e
o
f
th
e
b
ig
g
est
p
ain
p
o
i
n
ts
in
s
u
p
p
o
r
t
is
h
av
in
g
u
s
er
s
r
ep
ea
t
in
f
o
r
m
atio
n
wh
en
h
an
d
ed
o
f
f
to
a
h
u
m
an
.
C
L
AR
A
clo
s
es
th
is
g
ap
with
c
o
n
tex
t
f
o
r
war
d
in
g
.
W
h
en
a
ca
ll
i
s
an
s
wer
ed
,
th
e
Staf
f
Dash
b
o
ar
d
d
is
p
lay
s
a
b
r
ief
s
u
m
m
ar
y
o
f
th
e
AI
in
ter
ac
tio
n
(
f
o
r
ex
am
p
le,
“Visit
o
r
ask
ed
ab
o
u
t:
Deliv
er
i
es”)
,
allo
win
g
s
taf
f
to
s
tar
t
wi
th
co
n
te
x
t
(
“Hi,
I
s
ee
y
o
u
h
av
e
a
p
ac
k
ag
e
f
o
r
u
s
?”
)
,
m
ak
in
g
th
e
h
a
n
d
o
f
f
ea
s
ier
.
4.
SYST
E
M
DE
SI
G
N
4
.
1
.
3
-
T
ier
M
o
no
re
po
a
rc
hite
ct
ure
C
L
AR
A
h
a
s
a
clea
n
3
-
T
ier
Mo
n
o
r
ep
o
ar
ch
itectu
r
e,
wh
i
ch
is
p
r
o
p
er
ly
s
y
n
ch
r
o
n
ized
with
npm
wo
r
k
s
p
ac
es.
T
h
is
allo
ws th
e
co
m
p
o
n
en
ts
to
b
e
m
o
d
u
la
r
y
et
h
ig
h
ly
in
ter
lin
k
ed
.
a.
T
ier
1:
C
lien
t
-
Sid
e
(
Fro
n
ten
d
)
1)
Ap
p
s
: a
p
p
s
/clien
t a
n
d
ap
p
s
/s
taf
f
2)
T
ec
h
s
tack
: Reac
t 1
9
,
Vite,
T
a
ilwin
d
C
SS
3)
R
o
le:
R
en
d
er
s
th
e
UI
,
h
an
d
le
s
m
ed
ia
ca
p
t
u
r
e
v
ia
.
.
,
an
d
m
an
ag
es
lo
ca
l
s
tate.
T
h
e
cli
en
t
ap
p
h
as
a
“Ch
at
I
n
ter
f
a
ce
”
th
em
e,
wh
ile
th
e
s
taf
f
ap
p
h
as
a
“Da
s
h
b
o
ar
d
/Ad
m
in
”
th
e
m
e.
B
o
th
s
h
ar
e
an
d
co
n
s
u
m
e
a
co
m
m
o
n
“Vid
eo
C
all”
co
m
p
o
n
e
n
t
f
r
o
m
th
e
p
ac
k
ag
es/W
eb
R
T
C
s
h
ar
ed
lib
r
ar
y
.
b.
T
ier
2:
Ser
v
er
-
Sid
e
(
B
ac
k
en
d
)
1)
Ap
p
: a
p
p
s
/s
er
v
er
2)
T
ec
h
s
tack
: E
x
p
r
ess
.
js
,
So
ck
et
.
I
O
3)
R
o
le:
Han
d
les
b
u
s
in
ess
lo
g
ic,
au
th
en
ticatio
n
,
an
d
s
ig
n
al
in
g
r
o
u
tin
g
.
Pro
v
id
es
R
E
ST
en
d
p
o
i
n
ts
s
ec
u
r
ed
b
y
C
OR
S
m
id
d
lewa
r
e
an
d
h
elm
et
-
p
r
o
tecte
d
h
ea
d
e
r
s
.
A
s
p
ec
if
ic
R
T
C
n
am
esp
ac
e
o
n
th
e
So
ck
et.
I
O
s
er
v
er
h
a
n
d
les r
ea
l
-
tim
e
ev
en
ts
.
c.
T
ier
3:
Data
-
Sid
e
(
Sto
r
ag
e
)
1)
T
ec
h
s
tack
: Po
s
tg
r
eSQL
,
I
n
-
M
em
o
r
y
Ma
p
2)
R
o
le:
Han
d
les
lo
n
g
-
ter
m
s
to
r
ag
e
f
o
r
User
Pro
f
iles
an
d
C
all
L
o
g
s
.
Sto
r
ag
e
lo
g
ic
is
b
ased
o
n
a
R
ep
o
s
ito
r
y
p
atter
n
th
at
a
b
s
tr
ac
ts
th
e
d
ata
s
to
r
e,
en
a
b
lin
g
a
s
witch
b
etwe
en
th
e
d
atab
ase
an
d
th
e
In
-
Me
m
o
r
y
Ma
p
.
4
.
2
.
Da
t
a
f
l
o
w
a
nd
ent
it
y
re
l
a
t
io
ns
hip
s
I
n
C
L
AR
A,
th
e
d
ata
f
lo
w
is
en
g
in
ee
r
ed
to
h
av
e
lo
w
late
n
cy
wh
ile
k
ee
p
in
g
s
ec
u
r
ity
a
s
th
e
to
p
p
r
io
r
ity
.
T
h
e
p
r
o
ce
s
s
o
f
in
ter
a
ctio
n
is
r
ep
r
esen
ted
th
r
o
u
g
h
d
i
s
tin
ct
s
tag
es o
f
d
ata
f
lo
w
[
1
0
]
.
4.
3
.
Ca
ll initia
t
i
o
n f
lo
w
(
L
ev
el
1
DF
D)
a.
T
r
ig
g
er
: T
h
e
Vis
ito
r
click
s
“Call Staf
f
”
o
n
th
e
Kio
s
k
.
b.
E
m
it: T
h
e
C
lien
t A
p
p
em
its
a
ca
ll: in
itiate
ev
en
t w
ith
m
etad
ata
to
th
e
Ser
v
er
.
c.
Valid
ate:
T
h
e
Ser
v
er
v
alid
ates
th
e
r
eq
u
est an
d
d
eter
m
i
n
es wh
ich
s
taf
f
m
em
b
e
r
s
ar
e
ac
tiv
e.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8
7
0
8
I
n
t J E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
1
6
,
No
.
3
,
J
u
n
e
20
2
6
:
2
7
6
9
-
2
7
8
1
2774
d.
R
o
u
te:
T
h
e
Ser
v
er
em
its
a
ca
ll:
I
n
co
m
in
g
ev
e
n
t
to
th
e
s
p
ec
if
ic
R
o
o
m
I
D
ass
o
ciate
d
with
th
e
tar
g
et
s
taf
f
m
em
b
er
.
e.
Aler
t: T
h
e
Staf
f
Ap
p
r
i
n
g
s
an
d
d
is
p
lay
s
a
p
o
p
u
p
.
f.
Ack
n
o
wled
g
e:
T
h
e
Staf
f
Ap
p
ac
k
n
o
wled
g
es
th
e
e
v
en
t,
an
d
th
e
C
lien
t
UI
tr
an
s
itio
n
s
to
a
“Ri
n
g
in
g
”
s
tate
[
1
1
]
,
[
1
2
]
.
4.
4
.
E
ntit
y
-
re
la
t
io
ns
hip
m
o
del
T
h
e
d
atab
ase
d
esig
n
e
n
ab
les e
n
tity
-
r
elatio
n
s
h
ip
m
o
d
elin
g
f
o
r
u
s
er
s
an
d
ca
ll ses
s
io
n
s
.
a.
USERS
T
ab
le:
Sto
r
es
s
taf
f
in
f
o
r
m
atio
n
a
n
d
r
o
les.
Key
f
ield
s
in
clu
d
e:
1)
UUI
D
(
Prim
ar
y
Key
)
2)
em
ail
(
Un
iq
u
e)
3)
p
ass
wo
r
d
_
h
ash
4)
r
o
le
(
E
NUM
: '
s
taf
f
'
,
'
ad
m
in
'
)
5)
d
ep
ar
tm
en
t
b.
C
AL
L
_
SESSIO
N
S T
ab
le:
T
r
ac
k
s
all
in
ter
ac
tio
n
s
.
Key
f
ield
s
in
clu
d
e:
1)
_
(
PK)
2)
_
3)
_
(
Fo
r
eig
n
Key
)
4)
s
tatu
s
(
E
NUM
:
'
r
in
g
in
g
,
'
'
ac
ce
p
ted
,
'
'
en
d
ed
'
)
5)
_
,
_
(
tim
estam
p
s
)
6)
_
,
_
s
to
r
ed
as JS
ONB to
en
ab
le
b
r
o
wser
-
ag
n
o
s
tic
f
o
r
m
ats
4.
5
.
UM
L
s
equence
f
o
r
ca
ll set
up
T
h
e
s
eq
u
e
n
ce
o
f
e
v
en
ts
f
r
o
m
th
e
Vis
ito
r
,
Sig
n
alin
g
Ser
v
er
,
a
n
d
Staf
f
is
r
e
p
r
esen
ted
in
a
UM
L
s
eq
u
en
ce
d
iag
r
am
f
o
r
th
e
h
an
d
s
h
ak
e
p
r
o
ce
s
s
:
a.
Staf
f
click
s
“Ac
ce
p
t Call
.
”
b.
Staf
f
B
r
o
wser
ex
ec
u
tes
.
(
)
to
ac
c
ess
th
e
ca
m
er
a.
c.
Staf
f
B
r
o
wser
estab
lis
h
es a
n
(
)
.
d.
Staf
f
B
r
o
wser
ca
lls
(
)
.
e.
Staf
f
B
r
o
wser
em
its
a
s
ig
n
al
ev
en
t (
ty
p
e:
'
o
f
f
e
r
'
,
s
d
p
)
to
th
e
Ser
v
er
.
f.
Ser
v
er
r
elay
s
th
e
s
ig
n
al
to
th
e
C
lien
t K
io
s
k
.
g.
C
lien
t K
io
s
k
ca
lls
(
)
.
h.
C
lien
t K
io
s
k
ca
lls
(
)
.
i.
C
lien
t K
io
s
k
em
its
a
s
ig
n
al
ev
en
t (
ty
p
e:
'
an
s
wer
'
,
s
d
p
)
to
th
e
Ser
v
er
.
j.
Ser
v
er
r
elay
s
th
e
s
ig
n
al
to
th
e
Staf
f
B
r
o
wser
.
k.
Staf
f
B
r
o
wser
ca
lls
(
)
.
5.
M
E
T
H
O
DO
L
O
G
Y
AND
I
M
P
L
E
M
E
NT
A
T
I
O
N
5
.
1
.
T
o
o
ls
a
nd
t
ec
hn
o
lo
g
ies
C
L
AR
A
w
as
d
ev
el
o
p
e
d
wit
h
a
r
o
b
u
s
t
tec
h
s
ta
c
k
t
h
at
is
m
o
r
e
f
o
c
u
s
e
d
o
n
p
er
f
o
r
m
a
n
ce
a
n
d
s
ca
l
ab
ilit
y
.
a.
L
a
n
g
u
a
g
e
:
T
y
p
e
S
c
r
i
p
t
5
.
0
+
f
o
r
s
t
a
ti
c
t
y
p
i
n
g
,
w
h
ic
h
h
e
l
p
s
r
e
d
u
c
e
r
u
n
t
i
m
e
e
r
r
o
r
s
a
n
d
i
m
p
r
o
v
e
m
a
i
n
t
a
i
n
a
b
il
i
t
y
.
b.
R
u
n
tim
e:
No
d
e.
js
1
8
.
x
(
L
T
S)
as th
e
b
ac
k
en
d
r
u
n
tim
e
en
v
ir
o
n
m
en
t.
c.
Fro
n
ten
d
:
R
ea
ct
1
9
.
0
f
o
r
th
e
UI
,
co
u
p
led
with
Vite
5
.
0
f
o
r
o
p
tim
al
p
er
f
o
r
m
an
ce
an
d
T
ail
win
d
C
SS
3
.
4
f
o
r
s
ty
lin
g
.
d.
R
ea
l
-
tim
e
: So
ck
et.
I
O
4
.
7
f
o
r
t
h
e
W
eb
So
ck
et
s
ig
n
alin
g
lay
e
r
.
e.
Data
b
ase: Po
s
tg
r
eSQL
1
5
.
0
f
o
r
r
elatio
n
al
d
ata
s
to
r
a
g
e.
f.
C
o
n
tain
er
izatio
n
: D
o
ck
er
2
4
.
0
f
o
r
ap
p
co
n
tain
er
izatio
n
a
n
d
r
ep
r
o
d
u
cib
le
d
ep
l
o
y
m
en
t.
5
.
2
.
Alg
o
rit
hm
ic
im
plementa
t
io
n
5
.
2
.
1
.
E
x
press
ba
ck
end:
a
uth
a
nd
s
ig
na
lin
g
lo
g
ic
Au
th
en
ticatio
n
is
p
er
f
o
r
m
e
d
u
s
in
g
a
Du
al
-
T
o
k
en
Ap
p
r
o
ac
h
to
ac
h
iev
e
a
b
alan
ce
b
etwe
en
s
ec
u
r
ity
an
d
u
s
ab
ilit
y
.
a.
L
o
g
in
: A
f
ter
s
u
cc
ess
f
u
l v
alid
a
tio
n
o
f
c
r
ed
en
tials
,
th
e
s
er
v
er
p
r
o
v
id
es two
to
k
en
s
:
1)
Acc
ess
T
o
k
en
(
s
h
o
r
t
-
liv
e
d
,
1
5
m
in
u
tes)
f
o
r
API
ac
ce
s
s
.
2)
R
ef
r
esh
T
o
k
en
(
l
o
n
g
-
liv
ed
,
7
d
ay
s
)
s
to
r
ed
in
a
n
HT
T
P
-
On
ly
co
o
k
ie.
b.
Mid
d
l
ewa
r
e:
A
cu
s
to
m
m
i
d
d
l
e
war
e
is
u
s
e
d
f
o
r
p
r
o
te
cte
d
r
o
u
t
es.
I
t e
x
tr
ac
ts
t
h
e
t
o
k
e
n
f
r
o
m
t
h
e
a
u
t
h
o
r
iza
ti
o
n
h
e
ad
er
,
c
h
e
ck
s
its
s
i
g
n
at
u
r
e
wi
th
a
s
ec
r
et
k
ey
,
a
n
d
ass
ig
n
s
t
h
e
d
e
co
d
ed
p
a
y
l
o
a
d
t
o
.
.
O
n
f
ail
u
r
e,
i
t
r
et
u
r
n
s
a
4
0
1
U
n
a
u
t
h
o
r
iz
ed
r
es
p
o
n
s
e
[
1
3
]
.
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
-
8
7
0
8
C
LAR
A
:
A
u
n
ified
h
y
b
r
id
AI
-
h
u
ma
n
r
ec
ep
tio
n
is
t fra
mewo
r
k
u
s
in
g
Web
R
TC
and
…
(
D
h
a
n
u
s
h
S
r
id
h
a
r
B
a
b
u
)
2775
T
y
p
eScr
ip
t
function authMiddleware(req, res, next) {
const token = req.headers.authorization?.split(' ');
try {
const payload = jwt.verify(token, SECRET);
req.user = payload;
next();
} catch (e) {
res.status(401).json({ error: 'Token Expired' });
}
}
5
.
2
.
2
.
So
ck
e
t
.
I
O
Ro
o
m
ma
na
g
em
ent
a
lg
o
rit
hm
T
h
e
s
ig
n
alin
g
s
er
v
er
m
u
s
t
ef
f
i
cien
tly
r
o
u
te
m
ess
ag
es
b
etwe
e
n
s
p
ec
if
ic
p
ee
r
s
with
o
u
t
b
r
o
ad
ca
s
tin
g
to
th
e
en
tire
n
etwo
r
k
.
T
h
is
is
ac
h
iev
ed
th
r
o
u
g
h
a
r
o
o
m
m
a
n
ag
e
m
en
t a
lg
o
r
ith
m
(
_
{
}
).
a.
Ma
p
p
in
g
:
T
h
e
s
er
v
er
m
ain
tai
n
s
a
g
lo
b
al
Ma
p
d
ata
s
tr
u
ctu
r
e:
wh
ich
m
ap
s
to
.
b.
J
o
in
lo
g
ic
:
W
h
en
a
u
s
er
c
o
n
n
e
cts
an
d
a
u
th
en
ticates,
th
eir
s
o
ck
et
is
au
to
m
atica
lly
jo
in
ed
to
a
r
o
o
m
n
am
e
d
:
{
}
.
J
av
aScr
ip
t
socket.on('join', (userId) => {
socket.join(“user:” + userId);
userSocketMap.set(userId
, socket.id);
console.log(`User ${userId} joined room user:${userId}`);
});
c.
R
o
u
tin
g
lo
g
ic
:
T
o
s
en
d
a
m
ess
ag
e
to
a
s
p
ec
if
ic
u
s
er
,
th
e
s
er
v
er
em
its
th
e
ev
en
t
to
t
h
at
u
s
er
'
s
s
p
ec
if
ic
r
o
o
m
.
T
h
is
en
s
u
r
es
$
(
1
)
$
r
o
u
tin
g
co
m
p
lex
ity
.
J
av
aScr
ip
t
socket.on('callUser', (targetId, data) => {
io.to(“user:” + targetId).emit('incomingCall', data);
console.log(`Routing call to user:${targetId}`);
});
d.
C
lean
u
p
:
On
d
is
co
n
n
ec
tio
n
,
th
e
s
o
ck
et
is
au
to
m
atica
lly
r
e
m
o
v
ed
f
r
o
m
all
r
o
o
m
s
,
an
d
th
e
en
tr
y
is
clea
r
ed
f
r
o
m
th
e
.
5
.
2
.
3
.
WebRT
C
peer
co
nn
ec
t
io
n ha
nd
s
ha
k
e
(
I
CE
s
t
a
t
e
ma
chine)
T
h
e
p
r
o
ce
s
s
o
f
estab
lis
h
in
g
a
W
eb
R
T
C
co
n
n
ec
tio
n
is
a
s
tr
aig
h
tf
o
r
war
d
I
C
E
s
tate
m
ac
h
in
e
to
f
in
d
a
v
alid
n
etwo
r
k
p
ath
.
T
h
is
p
r
o
ce
s
s
in
v
o
lv
es
ex
ch
an
g
i
n
g
s
ess
io
n
d
escr
ip
tio
n
p
r
o
to
co
l
(
SDP)
in
f
o
r
m
atio
n
an
d
I
C
E
ca
n
d
id
ates
.
T
h
is
p
r
o
ce
s
s
ca
n
b
e
m
o
d
eled
as a
s
tate
tr
an
s
itio
n
d
iag
r
am
.
L
et
S b
e
th
e
s
et
o
f
I
C
E
s
tates: {N
ew,
Gath
er
in
g
,
C
h
ec
k
in
g
,
C
o
n
n
ec
ted
,
Failed
}.
L
et
C
b
e
th
e
s
et
o
f
I
C
E
C
an
d
i
d
ates.
a.
State
S0
(
New
)
: T
h
e
R
T
C
Peer
C
o
n
n
ec
tio
n
o
b
ject
is
cr
ea
ted
.
b.
State
S1
(
Gath
er
in
g
)
:
T
h
e
b
r
o
wser
s
ea
r
ch
es
STUN
s
er
v
er
s
t
o
d
is
co
v
er
its
p
u
b
lic
I
P
ad
d
r
e
s
s
,
en
ter
in
g
th
e
ℎ
(
)
.
c.
State
S2
(
C
h
ec
k
in
g
)
:
T
h
e
b
r
o
wser
m
atch
es
lo
ca
l
ca
n
d
id
ates
(
C
_
lo
ca
l
)
with
r
em
o
te
ca
n
d
id
ates
(
C
_
r
emo
te
)
r
ec
eiv
ed
th
r
o
u
g
h
s
ig
n
alin
g
a
n
d
p
er
f
o
r
m
s
co
n
n
ec
tiv
ity
ch
ec
k
s
.
T
h
is
is
th
e
ℎ
(
)
.
(
_
,
_
)
→
{
,
}
d.
State
S3
(
C
o
n
n
ec
ted
)
: A
v
alid
p
ath
is
estab
lis
h
ed
.
T
h
e
m
ed
ia
s
tr
ea
m
b
eg
i
n
s
to
f
l
o
w
o
v
er
SR
T
P.
e.
State
S4
(
Fai
led
)
:
I
f
n
o
v
alid
p
ath
is
estab
lis
h
ed
(
e.
g
.
,
s
y
m
m
etr
ic
NAT
)
,
th
e
s
tate
tr
an
s
it
i
o
n
s
to
'
F
AI
L
E
D'
,
in
itiatin
g
a
f
allb
ac
k
o
r
er
r
o
r
m
ess
ag
e.
T
h
is
n
eg
o
tiatio
n
p
r
o
ce
s
s
is
as
y
n
ch
r
o
n
o
u
s
.
T
h
e
s
ig
n
alin
g
s
e
r
v
er
tr
an
s
m
its
d
if
f
er
e
n
t
p
ay
lo
ad
s
(
o
f
f
er
,
an
s
wer
,
ca
n
d
id
ate)
f
r
o
m
ea
c
h
p
ee
r
[
1
4
]
,
[
1
5
]
.
5
.
2
.
4
.
I
n
-
m
emo
ry
f
a
llb
a
ck
re
s
ilience
lo
g
ic
T
h
e
C
allR
ep
o
s
ito
r
y
clas
s
h
as
a
f
allb
ac
k
s
y
s
tem
m
o
d
eled
b
y
a
s
elec
tio
n
f
u
n
ctio
n
σ
.
T
h
is
is
cr
itical
f
o
r
k
ee
p
in
g
t
h
e
s
y
s
tem
u
p
a
n
d
r
u
n
n
in
g
wh
en
th
e
d
ata
b
ase
is
n
o
t
s
tab
le.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8
7
0
8
I
n
t J E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
1
6
,
No
.
3
,
J
u
n
e
20
2
6
:
2
7
6
9
-
2
7
8
1
2776
L
et
D
b
e
th
e
Data
b
ase
s
tatu
s
an
d
M
b
e
th
e
m
em
o
r
y
s
to
r
e
.
T
h
e
s
to
r
a
g
e
f
u
n
ctio
n
Sto
r
e(
s
ess
io
n
)
is
d
ef
in
ed
as:
Store
(
session
) =
DB
.
insert
(
session
)
if
D
=
CONNECTED
MemoryMap
.
set
(
session
.
id
,
session
)
if
D
≠
CONNECTE
D
I
n
o
th
er
wo
r
d
s
,
th
e
s
y
s
tem
ch
ec
k
s
th
e
d
atab
ase
co
n
n
ec
tio
n
b
ef
o
r
e
e
v
er
y
wr
ite.
I
f
th
e
d
atab
ase
is
d
o
wn
[
1
6
]
,
it
p
r
in
ts
a
war
n
in
g
m
ess
ag
e
an
d
wr
ites
th
e
s
ess
io
n
in
f
o
r
m
atio
n
to
a
Ma
p
in
th
e
ap
p
licatio
n
h
ea
p
.
W
h
ile
th
is
in
f
o
r
m
atio
n
is
ep
h
e
m
er
al
(
lo
s
t
d
u
r
in
g
r
estar
ts
)
,
it
g
u
ar
an
tees
th
at
ca
llin
g
o
r
co
n
n
ec
tin
g
a
ca
ll
n
ev
er
g
ets b
lo
ck
ed
b
y
a
d
atab
ase
f
ailu
r
e.
J
av
aScr
ip
t
class CallRepository {
constructor() {
this.memoryMap = new Map();
}
async create(session) {
if (this.dbStatus === 'CONNECTED') {
// Primary path: Insert into database
return await this.db.insert(session);
} else {
// Fallback path: Use in
-
memory map
console.warn('DB Down, using Memory');
this.memoryMap.set(session.id, session);
return session;
}
}
}
6.
RE
SU
L
T
S AN
D
D
I
SCU
SS
I
O
N
6
.
1
.
P
er
f
o
r
m
a
nce
a
nd
t
esting
s
um
m
a
r
y
T
h
e
C
L
AR
A
s
y
s
tem
was te
s
te
d
f
o
r
p
er
f
o
r
m
a
n
ce
to
en
s
u
r
e
its
ap
p
licab
ilit
y
f
o
r
r
ea
l
-
tim
e
u
s
ag
e
with
in
an
in
s
titu
tio
n
al
en
v
ir
o
n
m
en
t.
T
h
e
test
in
g
was
ce
n
ter
ed
o
n
th
r
ee
m
ain
asp
ec
ts
:
laten
cy
,
th
r
o
u
g
h
p
u
t,
a
n
d
r
eliab
ilit
y
.
6
.
1
.
1
.
Video
la
t
ency
a
nd
qu
a
lity
m
et
rics
Glass
-
to
-
Glas
s
laten
cy
(
_
)
–
th
e
tim
e
tak
en
f
r
o
m
th
e
ac
tu
al
ev
en
t
in
th
e
r
ea
l
wo
r
ld
t
o
its
ap
p
ea
r
an
ce
o
n
th
e
r
ec
eiv
in
g
s
cr
ee
n
–
is
th
e
m
o
s
t im
p
o
r
tan
t
m
etr
ic
in
v
id
eo
c
o
m
m
u
n
icatio
n
.
a.
Ap
p
r
o
ac
h
:
_
m
ea
s
u
r
em
en
ts
w
er
e
d
o
n
e
u
s
in
g
a
h
i
g
h
-
s
p
ee
d
ca
m
er
a
s
y
s
tem
th
at
r
ec
o
r
d
e
d
b
o
th
t
h
e
s
en
d
in
g
an
d
r
ec
eiv
in
g
s
cr
ee
n
s
s
im
u
ltan
eo
u
s
ly
[
1
7
]
–
[
2
0
]
.
b.
Fin
d
in
g
s
c.
C
o
n
clu
s
io
n
:
T
h
e
s
y
s
tem
r
em
ain
s
well
w
ith
in
th
e
2
0
0
m
s
th
r
esh
o
ld
s
co
n
s
id
er
ed
n
ec
es
s
ar
y
f
o
r
n
atu
r
al,
u
n
b
r
o
k
en
co
n
v
er
s
atio
n
f
l
o
w.
Ad
ap
tiv
e
r
eso
lu
tio
n
s
ca
lin
g
(
r
ed
u
cin
g
f
r
o
m
7
2
0
p
to
3
6
0
p
o
n
s
u
b
o
p
tim
al
n
etwo
r
k
s
)
m
ain
tain
e
d
f
r
am
e
r
ates,
alb
eit
at
th
e
ex
p
en
s
e
o
f
p
ix
el
d
en
s
ity
.
6
.
1
.
2
.
O
nli
ne
m
o
de
-
AP
I
lo
a
d t
esting
L
o
ad
test
in
g
was d
o
n
e
u
s
in
g
t
h
e
k
6
t
o
o
l to
d
eter
m
in
e
th
e
s
ca
lab
ilit
y
o
f
th
e
s
ig
n
alin
g
s
er
v
er
.
a.
Scen
ar
io
:
5
0
0
co
n
cu
r
r
en
t v
ir
tu
al
u
s
er
s
(
VUs)
m
im
ick
in
g
s
taf
f
m
em
b
e
r
s
lo
g
g
i
n
g
i
n
an
d
f
etc
h
in
g
tim
etab
les
at
th
e
s
am
e
tim
e.
b.
Me
tr
ics:
1)
T
h
r
o
u
g
h
p
u
t (
λ
)
: th
e
n
u
m
b
e
r
o
f
s
u
cc
ess
f
u
l r
eq
u
ests
p
er
m
in
u
t
e
2)
P9
5
r
esp
o
n
s
e
tim
e
: th
e
9
5
th
p
er
ce
n
tile o
f
r
esp
o
n
s
e
tim
es
c.
R
esu
lts
:
1)
P9
5
r
esp
o
n
s
e
tim
e:
8
5
m
s
2)
E
r
r
o
r
r
ate:
0
%
3)
R
eso
u
r
ce
u
tili
za
tio
n
: CP
U
r
e
m
ain
ed
at
4
5
% o
n
a
s
tan
d
a
r
d
2
v
C
PU in
s
tan
ce
d.
An
aly
s
is
:
T
h
e
ev
en
t
-
d
r
iv
en
,
n
o
n
-
b
lo
c
k
in
g
I
/O
ar
c
h
itectu
r
e
o
f
No
d
e.
js
was
ex
tr
em
ely
ef
f
ec
tiv
e
at
h
an
d
lin
g
th
e
co
n
cu
r
r
en
c
y
o
f
W
eb
So
ck
e
t c
o
n
n
ec
tio
n
s
an
d
API
r
eq
u
ests
.
6
.
1
.
3
.
O
f
f
lin
e/f
a
llb
a
ck
m
o
de
re
lia
bil
it
y
A
f
u
ll d
atab
ase
f
ailu
r
e
was sim
u
lated
b
y
s
to
p
p
in
g
th
e
Po
s
tg
r
eSQL
co
n
tain
er
(
d
o
ck
e
r
s
to
p
Po
s
tg
r
es
).
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
-
8
7
0
8
C
LAR
A
:
A
u
n
ified
h
y
b
r
id
AI
-
h
u
ma
n
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ec
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tio
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is
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mewo
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k
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Web
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TC
and
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(
D
h
a
n
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s
h
S
r
id
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a
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B
a
b
u
)
2777
a.
Ob
s
er
v
atio
n
:
T
h
e
s
er
v
er
lo
g
s
im
m
ed
iately
r
ef
lecte
d
a
“c
o
n
n
ec
tio
n
er
r
o
r
”
an
d
f
ell
b
ac
k
to
th
e
“m
em
o
r
y
s
to
r
e”
s
tr
ateg
y
.
b.
I
m
p
ac
t:
No
is
s
u
es
wer
e
v
is
ib
l
e
to
u
s
er
s
.
Vis
ito
r
s
co
u
ld
in
iti
ate
ca
lls
,
an
d
s
taf
f
m
em
b
er
s
co
u
ld
jo
in
th
em
.
T
h
e
s
y
s
tem
was a
s
tateles
s
r
elay
.
c.
R
ec
o
v
er
y
:
Au
to
m
atica
lly
r
ec
o
n
n
ec
tin
g
to
th
e
d
atab
ase
v
alid
ated
th
e
o
f
f
lin
e
-
f
ir
s
t a
r
ch
itectu
r
e.
6
.
1
.
4
.
User
inte
rf
a
ce
a
nd
us
a
bil
it
y
t
esting
W
e
co
n
d
u
cted
a
u
s
ab
ilit
y
test
with
ten
p
ar
ticip
an
ts
,
f
iv
e
s
taf
f
an
d
f
iv
e
v
is
ito
r
s
.
a.
Vis
ito
r
f
ee
d
b
ac
k
:
T
h
e
a
n
im
ate
d
av
atar
p
r
o
v
id
e
d
a
s
en
s
e
o
f
s
o
cial
p
r
esen
ce
an
d
m
ad
e
th
e
p
ar
ticip
an
t
f
ee
l
as if
th
ey
wer
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b
ein
g
h
ea
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d
.
T
h
e
“Call Staf
f
”
b
u
tto
n
was a
s
ig
n
if
ican
t c
o
n
f
id
en
ce
b
u
ild
e
r
[
2
1
]
.
b.
Staf
f
f
ee
d
b
ac
k
:
Staf
f
ap
p
r
ec
i
ated
th
e
au
d
ib
le
aler
ts
,
wh
ich
allo
wed
th
em
to
m
u
ltit
ask
with
o
u
t
m
is
s
in
g
ca
lls
.
c.
SUS
s
co
r
e:
T
h
e
s
y
s
tem
u
s
ab
i
lity
s
ca
le
s
co
r
ed
8
8
o
u
t
o
f
1
0
0
,
in
d
icatin
g
a
n
A
-
g
r
ad
e
lev
el
o
f
u
s
ab
ilit
y
.
F
ig
u
r
e
1
s
h
o
ws
th
e
r
esu
lts
o
f
th
e
f
r
o
n
t
s
cr
ee
n
o
f
C
L
AR
A
o
n
ce
it
i
s
o
p
en
ed
an
d
a
ls
o
th
e
n
etwo
r
k
p
er
f
o
r
m
an
ce
is
co
m
p
ar
ed
in
T
ab
le
1
.
Fig
u
r
e
1
.
Fro
n
t scr
ee
n
o
f
th
e
C
L
AR
A
w
ith
v
ar
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u
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f
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ab
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1
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Netwo
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2
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ir
m
th
e
h
y
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o
th
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th
at
h
y
b
r
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AI
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ch
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e
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n
s
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cc
ess
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ll
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n
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o
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ig
h
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T
h
e
o
f
f
lin
e
-
f
ir
s
t
d
atab
ase
ar
ch
itectu
r
e
was
s
u
r
p
r
is
in
g
ly
r
esil
ien
t,
d
ec
o
u
p
lin
g
th
e
s
ig
n
alin
g
p
ath
f
r
o
m
th
e
p
er
s
is
ten
ce
lay
er
.
Mo
n
o
r
ep
o
d
ev
elo
p
m
en
t
was
f
aster
,
an
d
th
e
s
h
ar
ed
C
allSe
s
s
io
n
ty
p
e
d
ef
in
itio
n
b
etwe
en
th
e
b
ac
k
en
d
s
ch
em
a
a
n
d
th
e
f
r
o
n
ten
d
R
ea
ct
co
m
p
o
n
en
ts
r
ed
u
ce
d
d
ata
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s
tr
u
ctu
r
e
m
is
m
atch
er
r
o
r
s
to
al
m
o
s
t n
o
th
in
g
[
2
2
]
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8
7
0
8
I
n
t J E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
1
6
,
No
.
3
,
J
u
n
e
20
2
6
:
2
7
6
9
-
2
7
8
1
2778
T
h
e
s
u
cc
ess
f
u
l
b
u
ild
o
f
C
L
AR
A
d
em
o
n
s
tr
ates
th
at
cu
r
r
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t
web
tech
,
s
u
ch
as
W
eb
R
T
C
an
d
Pro
g
r
ess
iv
e
W
eb
Ap
p
s
,
h
as
r
e
ac
h
ed
a
le
v
el
o
f
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atu
r
ity
to
r
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p
r
o
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ietar
y
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ar
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war
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f
o
r
a
p
p
licatio
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s
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ch
as
v
is
ito
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m
an
ag
em
en
t.
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h
e
s
y
n
er
g
y
o
f
co
s
t
-
ef
f
ec
tiv
e
n
ess
(
u
s
in
g
o
f
f
-
th
e
-
s
h
elf
iPad
s
in
s
tead
o
f
s
p
ec
ialized
in
ter
co
m
h
ar
d
war
e)
an
d
f
lex
ib
ilit
y
(
r
em
o
tely
m
an
a
g
in
g
s
taf
f
)
p
r
o
v
id
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a
co
m
p
ellin
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b
u
s
in
ess
ca
s
e
f
o
r
im
p
lem
en
tatio
n
i
n
ed
u
ca
tio
n
al
an
d
b
u
s
in
ess
en
v
ir
o
n
m
en
t
s
[
2
3
]
.
T
o
m
ea
s
u
r
e
tech
n
ical
ef
f
ec
tiv
en
ess
,
co
s
t
ef
f
icien
cy
,
a
n
d
an
al
y
s
is
q
u
ality
th
e
p
er
f
o
r
m
a
n
ce
m
ea
s
u
r
es w
er
e
d
o
n
e
[
2
4
]
.
T
h
e
C
L
AR
A
Un
if
ied
Mo
n
o
r
e
p
o
p
r
o
v
i
d
es
a
p
r
o
d
u
ctio
n
-
r
ea
d
y
p
r
o
to
ty
p
e
f
o
r
a
h
y
b
r
id
AI
r
e
ce
p
tio
n
is
t
.
B
y
in
teg
r
atin
g
m
o
d
e
r
n
we
b
t
ec
h
—
R
ea
ct
f
o
r
th
e
UI
,
No
d
e.
js
f
o
r
lo
g
ic,
W
eb
R
T
C
[
2
5
]
,
[
2
6
]
f
o
r
m
ed
ia,
an
d
Po
s
tg
r
eSQL
f
o
r
d
ata
—
we
'
v
e
b
u
ilt
a
s
y
s
tem
th
at
i
s
g
r
ea
ter
t
h
an
th
e
s
u
m
o
f
its
p
ar
ts
.
I
t
s
o
l
v
es
th
e
Au
to
m
atio
n
Par
ad
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x
b
y
alwa
y
s
h
av
in
g
h
u
m
an
em
p
ath
y
at
h
an
d
,
as we
ll a
s
th
e
Scalab
ilit
y
p
r
o
b
lem
b
y
d
eleg
atin
g
m
u
n
d
an
e
task
s
to
AI
.
E
x
ten
s
iv
e
test
in
g
h
as sh
o
wn
th
at
o
u
r
s
y
s
tem
is
r
o
b
u
s
t,
s
ec
u
r
e,
a
n
d
u
s
er
-
f
r
ien
d
l
y
.
C
o
s
t
-
ef
f
ec
tiv
e
s
ca
lab
ilit
y
:
Ou
r
s
y
s
tem
allo
ws
a
s
in
g
le
em
p
lo
y
ee
to
m
an
ag
e
m
u
ltip
le
p
h
y
s
ic
al
lo
b
b
ies
f
r
o
m
a
d
is
tan
ce
,
s
ig
n
if
ican
tl
y
r
ed
u
cin
g
p
e
r
s
o
n
n
el
c
o
s
ts
.
Z
er
o
-
in
s
tall
d
ep
lo
y
m
en
t:
As
a
web
-
b
ased
PW
A,
C
L
AR
A
ca
n
r
u
n
o
n
co
m
m
o
d
ity
h
ar
d
war
e
(
s
u
ch
as
iPad
s
)
with
o
u
t
r
eq
u
ir
in
g
lar
g
e
s
o
f
tw
ar
e
in
s
tallatio
n
s
o
r
s
p
ec
ialized
h
ar
d
war
e.
Hig
h
a
v
ailab
ilit
y
:
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r
in
-
m
em
o
r
y
f
a
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en
s
u
r
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a
s
ea
m
less
u
s
er
ex
p
e
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ien
ce
,
e
v
en
d
u
r
in
g
o
u
tag
es.
Un
if
ied
d
ata
m
o
d
el:
T
h
e
Mo
n
o
r
ep
o
s
tr
u
ctu
r
e
h
elp
s
en
s
u
r
e
co
n
s
is
ten
cy
an
d
m
ain
tain
ab
ilit
y
,
m
in
im
izin
g
tech
n
ical
d
eb
t
[
2
7
]
.
7.
CO
NCLU
SI
O
N
T
h
is
s
tu
d
y
s
u
cc
ess
f
u
lly
d
e
m
o
n
s
tr
ates
th
e
C
L
AR
A
u
n
if
ied
Mo
n
o
r
ep
o
as
a
p
r
o
d
u
ctio
n
-
r
ea
d
y
p
r
o
to
ty
p
e
f
o
r
a
h
y
b
r
id
A
I
r
ec
ep
tio
n
is
t
,
ef
f
ec
tiv
ely
b
ala
n
cin
g
au
to
m
ated
ef
f
icien
cy
with
h
u
m
an
o
v
er
s
ig
h
t.
B
y
lev
er
ag
in
g
m
o
d
er
n
web
tech
n
o
lo
g
ies,
th
e
s
y
s
tem
ac
h
iev
e
s
s
ca
lab
le
an
d
co
s
t
-
ef
f
ec
tiv
e
v
is
ito
r
m
an
ag
em
en
t
with
o
u
t
r
ely
in
g
o
n
s
p
ec
ialize
d
h
ar
d
war
e.
Fu
tu
r
e
v
e
r
s
io
n
s
o
f
C
L
AR
A
will
f
u
r
th
er
in
te
g
r
ate
AI
an
d
ex
p
an
d
f
u
n
ctio
n
ality
:
v
o
ice
b
io
m
etr
i
cs:
in
teg
r
atin
g
V
o
ice
I
D
to
id
en
tify
r
eg
u
lar
s
taf
f
m
em
b
e
r
s
o
r
V
I
P
v
is
ito
r
s
,
allo
win
g
f
o
r
p
er
s
o
n
alize
d
g
r
e
etin
g
s
.
Mu
lti
-
ten
an
t
SaaS:
Mo
d
if
y
in
g
th
e
d
atab
ase
s
ch
em
a
to
h
an
d
le
m
u
ltip
le
o
r
g
an
izatio
n
s
o
n
a
s
in
g
le
s
er
v
er
,
allo
win
g
f
o
r
a
co
m
m
e
r
cial
SaaS
o
f
f
er
in
g
.
Mo
b
ile
n
ativ
e
ap
p
:
W
r
ap
p
in
g
th
e
s
taf
f
PW
A
in
R
ea
ct
Nativ
e
t
o
p
r
o
v
i
d
e
s
y
s
tem
-
lev
el
p
u
s
h
n
o
tific
atio
n
s
,
aler
tin
g
s
taf
f
ev
en
wh
en
th
e
ap
p
is
clo
s
ed
.
L
L
M
in
teg
r
atio
n
with
R
AG:
Up
g
r
ad
in
g
NL
P
f
r
o
m
s
im
p
le
k
ey
wo
r
d
s
ea
r
c
h
to
a
r
etr
iev
al
-
au
g
m
e
n
ted
g
en
er
atio
n
m
o
d
el
u
s
in
g
Op
e
n
AI
o
r
Gem
in
i
API
s
.
T
h
is
allo
ws
C
L
AR
A
to
p
r
o
ce
s
s
co
m
p
lex
,
co
n
tex
t
-
d
ep
en
d
e
n
t
q
u
er
ies
b
y
r
etr
iev
i
n
g
in
f
o
r
m
atio
n
f
r
o
m
th
e
in
s
titu
tio
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’
s
d
o
cu
m
en
ts
o
n
d
em
a
n
d
.
I
n
co
n
cl
u
s
io
n
,
C
L
AR
A
r
ep
r
esen
ts
a
s
ig
n
if
i
ca
n
t
s
tep
f
o
r
war
d
in
th
e
ap
p
licatio
n
o
f
AI
an
d
r
ea
l
-
ti
m
e
co
m
m
u
n
icatio
n
tech
n
o
lo
g
y
to
th
e
h
o
s
p
itality
a
n
d
v
is
ito
r
m
a
n
ag
em
en
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