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. O
Its O
area O
is O
24 O
mm/sup O
2 O
/ O
and O
its O
power O
consumption O
is O
120 B-KEY
mW I-KEY
Application O
of O
nonlinear B-KEY
time I-KEY
series I-KEY
analysis O
techniques O
to O
high-frequency B-KEY
currency I-KEY
exchange I-KEY
data I-KEY
In O
this O
work O
we O
have O
applied O
nonlinear B-KEY
time I-KEY
series I-KEY
analysis O
to O
high-frequency B-KEY
currency I-KEY
exchange I-KEY
data I-KEY
. O
The O
time O
series O
studied O
are O
the O
exchange B-KEY
rates I-KEY
between O
the O
US B-KEY
Dollar I-KEY
and O
18 O
other O
foreign B-KEY
currencies I-KEY
from O
within O
and O
without O
the O
Euro B-KEY
zone I-KEY
. O
Our O
goal O
was O
to O
determine O
if O
their O
dynamical O
behaviours O
were O
in O
some O
way O
correlated O
. O
The O
nonexistence O
of O
stationarity B-KEY
called O
for O
the O
application O
of O
recurrence B-KEY
quantification I-KEY
analysis I-KEY
as O
a O
tool O
for O