<s>
Automatic	B-General_Concept
indexing	I-General_Concept
is	O
the	O
computerized	O
process	O
of	O
scanning	O
large	O
volumes	O
of	O
documents	O
against	O
a	O
controlled	O
vocabulary	O
,	O
taxonomy	O
,	O
thesaurus	O
or	O
ontology	B-Language
and	O
using	O
those	O
controlled	O
terms	O
to	O
quickly	O
and	O
effectively	O
index	O
large	O
electronic	B-Protocol
document	I-Protocol
depositories	O
.	O
</s>
<s>
As	O
the	O
number	O
of	O
documents	O
exponentially	O
increases	O
with	O
the	O
proliferation	O
of	O
the	O
Internet	O
,	O
automatic	B-General_Concept
indexing	I-General_Concept
will	O
become	O
essential	O
to	O
maintaining	O
the	O
ability	O
to	O
find	O
relevant	O
information	O
in	O
a	O
sea	O
of	O
irrelevant	O
information	O
.	O
</s>
<s>
This	O
scale	O
provides	O
a	O
basis	O
for	O
what	O
is	O
considered	O
a	O
good	O
Automatic	B-General_Concept
Indexing	I-General_Concept
System	O
and	O
shows	O
where	O
problems	O
are	O
being	O
encountered	O
.	O
</s>
<s>
There	O
are	O
scholars	O
who	O
cite	O
that	O
the	O
subject	O
of	O
automatic	B-General_Concept
indexing	I-General_Concept
attracted	O
attention	O
as	O
early	O
as	O
the	O
1950s	O
,	O
particularly	O
with	O
the	O
demand	O
for	O
faster	O
and	O
more	O
comprehensive	O
access	O
to	O
scientific	O
and	O
engineering	O
literature	O
.	O
</s>
<s>
This	O
was	O
the	O
beginning	O
of	O
Automatic	B-General_Concept
Indexing	I-General_Concept
and	O
the	O
formula	O
to	O
pull	O
keywords	O
from	O
text	O
based	O
on	O
frequency	O
analysis	O
.	O
</s>
<s>
It	O
was	O
later	O
determined	O
that	O
frequency	O
alone	O
was	O
not	O
sufficient	O
for	O
good	O
descriptors	O
however	O
this	O
began	O
the	O
path	O
to	O
where	O
we	O
are	O
now	O
with	O
Automatic	B-General_Concept
Indexing	I-General_Concept
.	O
</s>
<s>
The	O
automatic	B-General_Concept
indexing	I-General_Concept
is	O
also	O
partly	O
driven	O
by	O
the	O
emergence	O
of	O
the	O
field	O
called	O
computational	O
linguistics	O
,	O
which	O
steered	O
research	O
that	O
eventually	O
produced	O
techniques	O
such	O
as	O
the	O
application	O
of	O
computer	O
analysis	O
to	O
the	O
structure	O
and	O
meaning	O
of	O
languages	O
.	O
</s>
<s>
Automatic	B-General_Concept
indexing	I-General_Concept
is	O
further	O
spurred	O
by	O
research	O
and	O
development	O
in	O
the	O
area	O
of	O
artificial	B-Application
intelligence	I-Application
and	O
self-organizing	O
system	O
also	O
referred	O
to	O
as	O
thinking	O
machine	O
.	O
</s>
<s>
Automatic	B-General_Concept
Indexing	I-General_Concept
has	O
many	O
practical	O
applications	O
like	O
for	O
instance	O
in	O
the	O
field	O
of	O
medicine	O
.	O
</s>
<s>
In	O
research	O
published	O
in	O
2009	O
,	O
researchers	O
talk	O
about	O
how	O
automatic	B-General_Concept
indexing	I-General_Concept
can	O
be	O
used	O
to	O
create	O
an	O
information	O
portal	O
where	O
users	O
can	O
find	O
out	O
reliable	O
information	O
about	O
a	O
drug	O
.	O
</s>
