<s>
A	O
Timed	B-Application
Event	I-Application
System	I-Application
defining	O
the	O
state	O
trajectory	O
associated	O
with	O
the	O
current	O
and	O
event	B-Application
segments	I-Application
came	O
from	O
the	O
class	O
of	O
General	O
System	O
to	O
allows	O
non-deterministic	O
behaviors	O
in	O
it	O
 [ Hwang2012 ] 	O
.	O
</s>
<s>
Since	O
the	B-Application
behaviors	I-Application
of	I-Application
DEVS	I-Application
can	O
be	O
described	O
by	O
Timed	B-Application
Event	I-Application
System	I-Application
,	O
DEVS	B-Application
and	O
RTDEVS	O
is	O
a	O
sub-class	O
or	O
an	O
equivalent	O
class	O
of	O
Timed	B-Application
Event	I-Application
System	I-Application
.	O
</s>
<s>
is	O
the	O
set	O
of	O
state	O
trajectories	O
in	O
which	O
indicates	O
that	O
a	O
state	O
can	O
change	O
into	O
along	O
with	O
an	O
event	B-Application
segment	I-Application
.	O
</s>
<s>
We	O
call	O
an	O
event	B-Application
segment	I-Application
a	O
-length	O
behavior	O
of	O
,	O
if	O
.	O
</s>
<s>
We	O
call	O
an	O
event	B-Application
segment	I-Application
an	O
infinite-length	O
behavior	O
of	O
,	O
if	O
.	O
</s>
