Biomedical Engineering Reference
In-Depth Information
Table 5. Role-based summary of genes at the 3x3 square
N
Pmtr
Act
Cons
Seq
Special
1-7
*
true
0100-1010
8
0000-0011
2.0101E-13
false
0001
9
0000
45.125
false
1100
Grown W
10
0010
1.4626E-29
false
0011
11
0000
41.1894
false
1000
Grown S
when the percentage has not been distributed yet.
The development of the structure can be seen in
Figure 12.
In this case, the tissue reaches its stable stage
very early, in cycle 8. This solution has a 0.0216
error.
the possible boxes of such area and they only use
14 cells. During the GA DNA search no obstacles
were used to reach the DNA fitness so this proves
that flexibility is inherent in the model used.
After all these tests, we can conclude that
the system searches for certain functions/roles
instead of concrete values in order to make the
DNA strands work.
It was observed that the system can be con-
figured in a simple way so as to change the range
of shapes or their orientation. Our current work
is focused on combining these compact genomes
(which perform simple growing tasks), scaling
them, and combining them in order to develop,
together with other compact genomes, more
complexes figures. One of the means for carry-
ing out this process would involve a set of initial
genes that generates a general shape such as the
one show in Figure 12; from this shape, another
set of genes would elaborate other different struc-
tures that could be combined with the previously
achieved ones.
Considerations
Other tests were carried out to explore the genera-
tion capabilities of the model. Some further testing
examples are: leaving only the edges of an initial
square shape, generating a cross shape from a
unique cell, or trying to generate a square structure
in an environment with non-valid positions. Some
of these examples could see on Figure 13.
Starting from a satisfactory 5x5 square test
result, other tests are performed in order to evalu-
ate the flexibility of the DNA solution that was
found. The dark points of the image at the right
of Figure 14 are positions that can not be occu-
pied by the cells; this fact induces a higher error
rate, but the used DNA was originated from an
environment without such obstacles. The results
are shown in Figure 14.
As it can be observed in Figure 14, in both types
of blockades, the tissue development is affected
by the obstacles placed in the environment.
The cells try to solve the problem and tend to
build the square trying to avoid the obstacles. The
two obtained solutions take up an approximately
5x5 box square area, although they do not use all
FUTURE TRENDS
The model showed here, have been applied to
the development of simple forms like: squares,
crosses, etc., but development of complex forms
and the reutilization of genes to archive it, is still an
open question. The way to archive these complex
forms is not clearly, so a lot of different attempts
may be tried until the best way is found.
 
Search WWH ::




Custom Search