<s>
SIMCOS	B-Language
(	O
an	O
acronym	O
standing	O
for	O
SIMulation	O
of	O
COntinuous	O
Systems	O
)	O
is	O
a	O
computer	B-Language
language	I-Language
and	O
a	O
development	O
environment	O
for	O
computer	B-Application
simulation	I-Application
.	O
</s>
<s>
Tutsim	B-Application
,	O
ACSL	B-Application
etc	O
.	O
)	O
</s>
<s>
It	O
is	O
a	O
DOS	B-Device
based	O
software	O
occasionally	O
it	O
is	O
slightly	O
modified	O
so	O
it	O
can	O
be	O
run	O
under	O
actual	O
versions	O
of	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
When	O
a	O
simulation	O
scheme	O
must	O
be	O
prepared	O
it	O
must	O
be	O
described	O
in	O
the	O
SIMCOS	B-Language
language	O
.	O
</s>
<s>
Edit	O
enclosed	O
with	O
DOS	B-Device
.	O
</s>
<s>
Whichever	O
form	O
of	O
entry	O
of	O
the	O
model	O
is	O
used	O
,	O
the	O
first	O
phase	O
of	O
simulation	O
reprocesses	O
it	O
into	O
space	O
of	O
states	O
form	O
and	O
rewrites	O
the	O
program	O
into	O
Fortran	B-Application
and	O
prepares	O
files	O
with	O
input	O
parameters	O
.	O
</s>
<s>
This	O
Fortran	B-Application
program	O
is	O
compiled	O
into	O
an	O
executable	O
file	O
(	O
.EXE	O
)	O
and	O
executed	O
.	O
</s>
<s>
When	O
it	O
terminates	O
,	O
SIMCOS	B-Language
takes	O
control	O
again	O
and	O
can	O
display	O
results	O
as	O
a	O
graphic	O
plot	O
.	O
</s>
<s>
The	O
"	O
heart	O
"	O
of	O
the	O
executable	O
is	O
function	O
INTEG	O
which	O
can	O
solve	O
differential	O
equations	O
using	O
one	O
of	O
several	O
numerical	B-Algorithm
methods	I-Algorithm
.	O
</s>
<s>
values	O
of	O
parameters	O
,	O
initial	O
conditions	O
)	O
from	O
files	O
then	O
it	O
calls	O
the	O
function	O
DERIV	O
where	O
the	O
model	O
is	O
actually	O
described	O
as	O
series	O
of	O
functions	O
of	O
its	O
derivatives	B-Algorithm
.	O
</s>
<s>
The	O
returned	O
values	O
are	O
used	O
at	O
the	O
selected	O
numerical	B-Algorithm
method	I-Algorithm
.	O
</s>
