Difference between revisions of "Open Problems"
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<li>In [[Self-Assembly of Discrete Self-Similar Fractals]], Patitz and Summers proved several results about self-assembling discrete self-similar fractals, but it is still an open questions as to whether or not there exists a discrete self-similar fractal that can be self-assembled in the [[Abstract Tile Assembly Model (aTAM) | aTAM]]. Also, are there discrete self-similar fractals which are not pinch-point fractals that are provably impossible to strictly self-assemble (e.g. the Sierpinski carpet)?</li> | <li>In [[Self-Assembly of Discrete Self-Similar Fractals]], Patitz and Summers proved several results about self-assembling discrete self-similar fractals, but it is still an open questions as to whether or not there exists a discrete self-similar fractal that can be self-assembled in the [[Abstract Tile Assembly Model (aTAM) | aTAM]]. Also, are there discrete self-similar fractals which are not pinch-point fractals that are provably impossible to strictly self-assemble (e.g. the Sierpinski carpet)?</li> | ||
| − | <li>In [[Self- | + | <li>In [[Self-Assembly with Geometric Tiles]], a construction was shown in which 2D tiles with disconnected geometries which are forced to stay within the plane as they combine, are capable of assembling $n \times n$ squares using only $O(\log(\log(n)))$ tile types. Can a similar construction be shown with connected geometries (and staying in 2D)?</li> |
| − | <li>In [[ | + | <li>In [[Computability and Complexity in Self-Assembly]], it was shown that for every computably enumerable language $L \subset \mathbb{N}$, a pattern representing $L$ [[Weak_Self-Assembly | weakly self-assembles]] along the x-axis, but with the points spread out roughly quadratically. Can those points instead be spread out by only a constant factor? (Or with no space between them as with decidable languages as shown in [[Self-Assembly of Decidable Sets]]?)</li> |
==References== | ==References== | ||
Revision as of 19:20, 27 May 2014
The following are a list of open problems in self-assembly:
- In his 1998 thesis [1], Winfree showed that the class of directed aTAM systems at temperature 2 is computationally universal, and in [2] Cook et al. showed that undirected temperature 1 aTAM systems could perform computations with a given amount of certainty. They also showed that in 2 planes directed aTAM temperature 1 systems are computationally universal. Is the class of directed aTAM systems at temperature 1 in the plane computationally universal? In [3] Doty, Patitz, and Summers provide deep insights into this question.
- In [4], Doty et al. introduced a model known as the fuzzy temperature model and showed that in this model n by n squares could efficiently self-assemble. Can systems in this model also perform general computation?
- In [5] Doty et al. showed that the aTAM is intrinsically universal for itself, but for directed systems the intrinsically universal tile set fundamentally relies on nondeterminism. Is the class of directed aTAM systems intrinsically universal for itself?
- Is the STAM intrinsically universal for itself? Also, in [6] it was shown that the 3D aTAM is IU for a subset of the STAM, but it remains open whether or not adding negative strength glues allows the 3D aTAM to be IU for the full STAM.
- Is the class of aTAM systems at temperature 1 intrinsically universal for itself?
- In his 1998 thesis [1], Winfree introduced both the aTAM and its more practical counterpart the kTAM. Currently, the 2HAM does not have a more realistic counterpart. Formulate a "k2HAM" model which takes into account the size of assemblies binding together (the bigger the assemblies the less likely it is they will bind together) and the lack of rigidity when assemblies come together.
- In Self-Assembly of Discrete Self-Similar Fractals, Patitz and Summers proved several results about self-assembling discrete self-similar fractals, but it is still an open questions as to whether or not there exists a discrete self-similar fractal that can be self-assembled in the aTAM. Also, are there discrete self-similar fractals which are not pinch-point fractals that are provably impossible to strictly self-assemble (e.g. the Sierpinski carpet)?
- In Self-Assembly with Geometric Tiles, a construction was shown in which 2D tiles with disconnected geometries which are forced to stay within the plane as they combine, are capable of assembling \(n \times n\) squares using only \(O(\log(\log(n)))\) tile types. Can a similar construction be shown with connected geometries (and staying in 2D)?
- In Computability and Complexity in Self-Assembly, it was shown that for every computably enumerable language \(L \subset \mathbb{N}\), a pattern representing \(L\) weakly self-assembles along the x-axis, but with the points spread out roughly quadratically. Can those points instead be spread out by only a constant factor? (Or with no space between them as with decidable languages as shown in Self-Assembly of Decidable Sets?)
- ↑ 1.0 1.1
Erik Winfree - Algorithmic Self-Assembly of DNA
- Ph.D. Thesis, California Institute of Technology , June 1998
- BibtexAuthor : Erik Winfree
Title : Algorithmic Self-Assembly of DNA
In : Ph.D. Thesis, California Institute of Technology -
Address :
Date : June 1998
- ↑
Matthew Cook, Yunhui Fu, Robert T. Schweller - Temperature 1 Self-Assembly: Deterministic Assembly in 3{D} and Probabilistic Assembly in 2{D}
- SODA 2011: Proceedings of the 22nd Annual ACM-SIAM Symposium on Discrete Algorithms ,2011
- BibtexAuthor : Matthew Cook, Yunhui Fu, Robert T. Schweller
Title : Temperature 1 Self-Assembly: Deterministic Assembly in 3{D} and Probabilistic Assembly in 2{D}
In : SODA 2011: Proceedings of the 22nd Annual ACM-SIAM Symposium on Discrete Algorithms -
Address :
Date : 2011
- ↑
David Doty, Matthew J. Patitz, Scott M. Summers - Limitations of Self-Assembly at Temperature 1
- Theoretical Computer Science 412:145-158,2011
- BibtexAuthor : David Doty, Matthew J. Patitz, Scott M. Summers
Title : Limitations of Self-Assembly at Temperature 1
In : Theoretical Computer Science -
Address :
Date : 2011
- ↑
David Doty, Matthew J. Patitz, Dustin Reishus, Robert T. Schweller, Scott M. Summers - Strong Fault-Tolerance for Self-Assembly with Fuzzy Temperature
- Proceedings of the 51st Annual IEEE Symposium on Foundations of Computer Science (FOCS 2010) pp. 417--426,2010
- BibtexAuthor : David Doty, Matthew J. Patitz, Dustin Reishus, Robert T. Schweller, Scott M. Summers
Title : Strong Fault-Tolerance for Self-Assembly with Fuzzy Temperature
In : Proceedings of the 51st Annual IEEE Symposium on Foundations of Computer Science (FOCS 2010) -
Address :
Date : 2010
- ↑
David Doty, Jack H. Lutz, Matthew J. Patitz, Robert T. Schweller, Scott M. Summers, Damien Woods - The tile assembly model is intrinsically universal
- Proceedings of the 53rd Annual IEEE Symposium on Foundations of Computer Science ,2012
- BibtexAuthor : David Doty, Jack H. Lutz, Matthew J. Patitz, Robert T. Schweller, Scott M. Summers, Damien Woods
Title : The tile assembly model is intrinsically universal
In : Proceedings of the 53rd Annual IEEE Symposium on Foundations of Computer Science -
Address :
Date : 2012
- ↑
Jacob Hendricks, Jennifer E. Padilla, Matthew J. Patitz, Trent A. Rogers - Signal Transmission across Tile Assemblies: 3D Static Tiles
Simulate Active Self-assembly by 2D Signal-Passing Tiles
- DNA Computing and Molecular Programming - 19th International Conference, DNA 19, Tempe, AZ, USA, September 22-27, 2013. Proceedings pp. 90-104,2013
- BibtexAuthor : Jacob Hendricks, Jennifer E. Padilla, Matthew J. Patitz, Trent A. Rogers
Title : Signal Transmission across Tile Assemblies: 3D Static TilesSimulate Active Self-assembly by 2D Signal-Passing Tiles
Proceedings -
In : DNA Computing and Molecular Programming - 19th International Conference, DNA 19, Tempe, AZ, USA, September 22-27, 2013.
Address :
Date : 2013
