<s>
In	O
the	O
field	O
of	O
simulation	O
,	O
a	O
discrete	B-Application
rate	I-Application
simulation	I-Application
models	O
the	O
behavior	O
of	O
mixed	O
discrete	O
and	O
continuous	O
systems	O
.	O
</s>
<s>
Industrial	O
areas	O
where	O
discrete	B-Application
rate	I-Application
simulation	I-Application
is	O
used	O
include	O
:	O
</s>
<s>
Discrete	B-Application
rate	I-Application
simulation	I-Application
combines	O
the	O
event-based	O
timing	O
of	O
discrete	B-General_Concept
event	I-General_Concept
simulation	I-General_Concept
and	O
the	O
continuous	O
variables	O
calculations	O
found	O
in	O
continuous	B-General_Concept
simulation	I-General_Concept
.	O
</s>
<s>
Discrete	B-Application
rate	I-Application
simulation	I-Application
is	O
similar	O
to	O
discrete	B-General_Concept
event	I-General_Concept
simulation	I-General_Concept
in	O
that	O
both	O
methodologies	O
model	O
the	O
operation	O
of	O
the	O
system	O
as	O
a	O
discrete	O
sequence	O
of	O
events	O
in	O
time	O
.	O
</s>
<s>
However	O
,	O
while	O
discrete	B-General_Concept
event	I-General_Concept
simulation	I-General_Concept
assumes	O
there	O
is	O
no	O
change	O
in	O
the	O
system	O
between	O
consecutive	O
events	O
,	O
in	O
a	O
discrete	B-Application
rate	I-Application
simulation	I-Application
model	O
the	O
flow	O
continues	O
to	O
move	O
at	O
a	O
constant	O
rate	O
such	O
that	O
,	O
for	O
example	O
,	O
the	O
level	O
in	O
a	O
tank	O
could	O
change	O
.	O
</s>
<s>
Another	O
difference	O
is	O
that	O
discrete	B-General_Concept
event	I-General_Concept
simulation	I-General_Concept
models	O
are	O
overwhelmingly	O
concerned	O
with	O
the	O
status	O
of	O
system	O
entities	O
(	O
discrete	O
objects	O
moving	O
through	O
the	O
system	O
)	O
while	O
discrete	B-Application
rate	I-Application
simulation	I-Application
models	O
are	O
concerned	O
with	O
the	O
status	O
(	O
quantity	O
and	O
location	O
)	O
of	O
homogeneous	O
flow	O
.	O
</s>
<s>
For	O
rate-based	O
systems	O
,	O
discrete	B-Application
rate	I-Application
simulation	I-Application
has	O
faster	O
computational	O
times	O
and	O
is	O
more	O
accurate	O
in	O
calculating	O
mass	O
balance	O
compared	O
to	O
discrete	B-General_Concept
event	I-General_Concept
simulation	I-General_Concept
.	O
</s>
<s>
Discrete	B-Application
rate	I-Application
simulation	I-Application
is	O
also	O
similar	O
to	O
continuous	B-General_Concept
simulation	I-General_Concept
in	O
that	O
it	O
simulates	O
homogeneous	O
flow	O
.	O
</s>
<s>
However	O
,	O
discrete	B-Application
rate	I-Application
simulation	I-Application
S	O
differs	O
from	O
continuous	B-General_Concept
simulation	I-General_Concept
in	O
that	O
it	O
is	O
event-based	O
and	O
does	O
not	O
simulate	O
every	O
time	O
slice	O
.	O
</s>
<s>
Modeling	O
linear	O
flow	O
systems	O
using	O
continuous	B-General_Concept
simulation	I-General_Concept
has	O
limitations	O
because	O
it	O
usually	O
is	O
unable	O
to	O
detect	O
important	O
events	O
,	O
such	O
as	O
a	O
tank	O
becoming	O
full	O
or	O
empty	O
,	O
until	O
after	O
the	O
event	O
has	O
occurred	O
plus	O
requires	O
many	O
more	O
system	O
recalculations	O
during	O
the	O
course	O
of	O
the	O
simulation	O
.	O
</s>
