<s>
Novelty	B-Algorithm
detection	I-Algorithm
is	O
the	O
mechanism	O
by	O
which	O
an	O
intelligent	O
organism	O
is	O
able	O
to	O
identify	O
an	O
incoming	O
sensory	O
pattern	O
as	O
being	O
hitherto	O
unknown	O
.	O
</s>
<s>
In	O
technology	O
,	O
the	O
principle	O
became	O
important	O
for	O
radar	B-Application
detection	I-Application
methods	O
during	O
the	O
Cold	O
War	O
,	O
where	O
unusual	O
aircraft-reflection	O
patterns	O
could	O
indicate	O
an	O
attack	O
by	O
a	O
new	O
type	O
of	O
aircraft	O
.	O
</s>
