human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "active tile self assembly self similar structures and recursion"
  Abstract: We present an active tile assembly model which extends Winfree's abstract tile assembly model to tiles that are capable of transmitting and receiving binding site activation signals. In addition, we introduce a mathematical framework to address self-similarity and recursion within the model. The model is applied to show a recursive assembly of an archetypal self-similar aperiodic tiling known as the L-shape tiling.

Connected through hyperedge HE-1 (induced by source paper "self assembly of 4 sided fractals in the two handed tile assembly model"):
  with members:
    - "hierarchical growth is necessary and sometimes sufficient to self assemble discrete self similar fractals"
    - "the non cooperative tile assembly model is not intrinsically universal or capable of bounded turing machine simulation"
    - "universal simulation of directed systems in the abstract tile assembly model requires undirectedness"
    - "hierarchical self assembly of fractals with signal passing tiles extended abstract"
    - "hierarchical self assembly of fractals with signal passing tiles"
    - "self assembly of shapes at constant scale using repulsive forces"
    - "universal shape replicators via self assembly with attractive and repulsive forces"
    - "the simulation powers and limitations of higher temperature hierarchical self assembly systems"

Connected through hyperedge HE-2 (induced by source paper "parallel computation using active self assembly"):
  with members:
    - "more tight bounds for active self assembly using an insertion primitive"
    - "the two handed tile assembly model is not intrinsically universal"
    - "signal transmission across tile assemblies 3d static tiles simulate active self assembly by 2d signal passing tiles"
    - "on the equivalence of cellular automata and the tile assembly model"
    - "active self assembly of algorithmic shapes and patterns in polylogarithmic time"
    - "intrinsic universality in tile self assembly requires cooperation"
    - "intrinsic universality and the computational power of self assembly"
    - "and and or or uniform polynomial size circuits"

Connected through hyperedge HE-3 (induced by source paper "intrinsic universality and the computational power of self assembly"):
  with members:
    - "the simulation powers and limitations of higher temperature hierarchical self assembly systems"
    - "it s a tough nanoworld in tile assembly cooperation is not strictly more powerful than competition"
    - "computing in continuous space with self assembling polygonal tiles"
    - "doubles and negatives are positive in self assembly"
    - "more tight bounds for active self assembly using an insertion primitive"
    - "scaled tree fractals do not strictly self assemble"
    - "universal computation with arbitrary polyomino tiles in non cooperative self assembly"
    - "the power of duples in self assembly it s not so hip to be square"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.ET(Emerging Technologies)