<s>
The	O
S-graph	B-General_Concept
framework	O
is	O
an	O
approach	O
to	O
solving	O
batch	O
process	O
scheduling	O
problems	O
in	O
chemical	O
plants	O
.	O
</s>
<s>
S-graph	B-General_Concept
is	O
suited	O
for	O
the	O
problems	O
with	O
a	O
non-intermediate	O
storage	O
(	O
NIS	O
)	O
policy	O
,	O
which	O
often	O
appears	O
in	O
chemical	O
productions	O
,	O
but	O
it	O
is	O
also	O
capable	O
of	O
solving	O
problems	O
with	O
an	O
unlimited	O
intermediate	O
storage	O
(	O
UIS	O
)	O
policy	O
.	O
</s>
<s>
The	O
S-graph	B-General_Concept
representation	O
exploits	O
problem-specific	O
knowledge	O
to	O
develop	O
efficient	O
scheduling	O
algorithms	O
.	O
</s>
<s>
S-graph	B-General_Concept
framework	O
also	O
contains	O
combinatoric	O
algorithms	O
to	O
solve	O
both	O
of	O
these	O
problems	O
.	O
</s>
