<s>
The	O
SMART	O
(	O
System	B-Application
for	I-Application
the	I-Application
Mechanical	I-Application
Analysis	I-Application
and	I-Application
Retrieval	I-Application
of	I-Application
Text	I-Application
)	O
Information	B-Library
Retrieval	I-Library
System	I-Library
is	O
an	O
information	B-Library
retrieval	I-Library
system	I-Library
developed	O
at	O
Cornell	O
University	O
in	O
the	O
1960s	O
.	O
</s>
<s>
Many	O
important	O
concepts	O
in	O
information	B-Library
retrieval	I-Library
were	O
developed	O
as	O
part	O
of	O
research	O
on	O
the	O
SMART	O
system	O
,	O
including	O
the	O
vector	O
space	O
model	O
,	O
relevance	B-Application
feedback	I-Application
,	O
and	O
Rocchio	B-Algorithm
classification	I-Algorithm
.	O
</s>
<s>
The	O
mnemonic	O
for	O
representing	O
a	O
combination	O
of	O
weights	O
takes	O
the	O
form	O
ddd.qqq	O
,	O
where	O
the	O
first	O
three	O
letters	O
represents	O
the	O
term	O
weighting	O
of	O
the	O
collection	O
document	O
vector	O
and	O
the	O
second	O
three	O
letters	O
represents	O
the	O
term	O
weighting	O
for	O
the	O
query	B-Library
document	O
vector	O
.	O
</s>
<s>
For	O
example	O
,	O
ltc.lnn	O
represents	O
the	O
ltc	O
weighting	O
applied	O
to	O
a	O
collection	O
document	O
and	O
the	O
lnn	O
weighting	O
applied	O
to	O
a	O
query	B-Library
document	O
.	O
</s>
