<s>
Tse-yun	O
Feng	O
suggested	O
the	O
use	O
of	O
degree	B-Operating_System
of	I-Operating_System
parallelism	I-Operating_System
to	O
classify	O
various	O
computer	B-General_Concept
architecture	I-General_Concept
.	O
</s>
<s>
degree	B-Operating_System
of	I-Operating_System
parallelism	I-Operating_System
.	O
</s>
<s>
The	O
maximum	O
degree	B-Operating_System
of	I-Operating_System
parallelism	I-Operating_System
depends	O
on	O
the	O
structure	O
of	O
the	O
arithmetic	O
and	O
logic	O
unit	O
.	O
</s>
<s>
Higher	O
degree	B-Operating_System
of	I-Operating_System
parallelism	I-Operating_System
indicates	O
a	O
highly	O
parallel	O
ALU	O
or	O
processing	O
element	O
.	O
</s>
<s>
According	O
to	O
Feng	B-Architecture
's	I-Architecture
classification	I-Architecture
,	O
computer	B-General_Concept
architecture	I-General_Concept
can	O
be	O
classified	O
into	O
four	O
.	O
</s>
<s>
It	O
fails	O
to	O
project	O
the	O
concurrency	O
in	O
pipeline	O
processors	O
,	O
as	O
degree	B-Operating_System
of	I-Operating_System
parallelism	I-Operating_System
does	O
n't	O
account	O
for	O
concurrency	O
handle	O
by	O
pipe-lined	O
design	O
.	O
</s>
