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: "an improved outer bound on the storage repair bandwidth tradeoff of exact repair regenerating codes"
  Abstract: In this paper we establish an improved outer bound on the storage-repair-bandwidth tradeoff of regenerating codes under exact repair. The result shows that in particular, it is not possible to construct exact-repair regenerating codes that asymptotically achieve the tradeoff that holds for functional repair. While this had been shown earlier by Tian for the special case of $[n,k,d]=[4,3,3]$ the present result holds for general $[n,k,d]$. The new outer bound is obtained by building on the framework established earlier by Shah et al.

Connected through hyperedge HE-1 (induced by source paper "on the achievability region of regenerating codes for multiple erasures"):
  with members:
    - "progress on high rate msr codes enabling arbitrary number of helper nodes"
    - "minimum storage regenerating codes for all parameters"
    - "explicit constructions of high rate mds array codes with optimal repair bandwidth"
    - "centralized repair of multiple node failures with applications to communication efficient secret sharing"
    - "shortened regenerating codes"
    - "a note on the rate region of exact repair regenerating codes"
    - "layered exact repair regenerating codes via embedded error correction and block designs"
    - "outer bounds for exact repair codes"

Connected through hyperedge HE-2 (induced by source paper "on secure exact repair regenerating codes with a single pareto optimal point"):
  with members:
    - "on the tradeoff region of secure exact repair regenerating codes"
    - "toward optimal secure distributed storage systems with exact repair"
    - "the storage repair bandwidth trade off of exact repair linear regenerating codes for the case d k n 1"
    - "outer bounds for exact repair codes"
    - "optimal locally repairable and secure codes for distributed storage systems"
    - "characterizing the rate region of the 4 3 3 exact repair regenerating codes"
    - "data secrecy in distributed storage systems under exact repair"
    - "exact repair regenerating codes via layered erasure correction and block designs"

Connected through hyperedge HE-3 (induced by source paper "centralized multi node repair regenerating codes"):
  with members:
    - "cooperative repair constructions of optimal mds codes for all admissible parameters"
    - "optimal mds codes for cooperative repair"
    - "repairing reed solomon codes universally achieving the cut set bound for any number of erasures"
    - "repairing reed solomon codes with two erasures"
    - "repairing multiple failures for scalar mds codes"
    - "progress on high rate msr codes enabling arbitrary number of helper nodes"
    - "repairing reed solomon codes with multiple erasures"
    - "minimum storage regenerating codes for all parameters"

Connected through hyperedge HE-4 (induced by source paper "increasing availability in distributed storage systems via clustering"):
  with members:
    - "the storage versus repair bandwidth trade off for clustered storage systems"
    - "an explicit coupled layer construction of a high rate msr code with low sub packetization level small field size and all node repair"
    - "explicit constructions of high rate mds array codes with optimal repair bandwidth"
    - "the storage repair bandwidth trade off of exact repair linear regenerating codes for the case d k n 1"
    - "achieving arbitrary locality and availability in binary codes"
    - "layered exact repair regenerating codes via embedded error correction and block designs"
    - "locality and availability in distributed storage"
    - "characterizing the rate region of the 4 3 3 exact repair regenerating codes"

Connected through hyperedge HE-5 (induced by source paper "a connection between locally repairable codes and exact regenerating codes"):
  with members:
    - "when locally repairable codes meet regenerating codes what if some helpers are unavailable"
    - "layered exact repair regenerating codes via embedded error correction and block designs"
    - "locally repairable codes and matroid theory"
    - "codes between mbr and msr points with exact repair property"
    - "when and by how much can helper node selection improve regenerating codes"
    - "outer bounds for exact repair codes"
    - "optimal locally repairable and secure codes for distributed storage systems"
    - "new codes and inner bounds for exact repair in distributed storage systems"

Connected through hyperedge HE-6 (induced by source paper "toward optimal secure distributed storage systems with exact repair"):
  with members:
    - "layered exact repair regenerating codes via embedded error correction and block designs"
    - "outer bounds for exact repair codes"
    - "optimal locally repairable and secure codes for distributed storage systems"
    - "new codes and inner bounds for exact repair in distributed storage systems"
    - "characterizing the rate region of the 4 3 3 exact repair regenerating codes"
    - "data secrecy in distributed storage systems under exact repair"
    - "a solution to the network challenges of data recovery in erasure coded distributed storage systems a study on the facebook warehouse cluster"
    - "rate region of the 4 3 3 exact repair regenerating codes"

Connected through hyperedge HE-7 (induced by source paper "outer bounds on the storage repair bandwidth tradeoff of exact repair regenerating codes"):
  with members:
    - "shortened regenerating codes"
    - "a note on the rate region of exact repair regenerating codes"
    - "the storage repair bandwidth trade off of exact repair linear regenerating codes for the case d k n 1"
    - "layered exact repair regenerating codes via embedded error correction and block designs"
    - "outer bounds for exact repair codes"
    - "new codes and inner bounds for exact repair in distributed storage systems"
    - "characterizing the rate region of the 4 3 3 exact repair regenerating codes"
    - "zigzag codes mds array codes with optimal rebuilding"

Connected through hyperedge HE-8 (induced by source paper "information theoretically secure erasure codes for distributed storage"):
  with members:
    - "toward optimal secure distributed storage systems with exact repair"
    - "the storage repair bandwidth trade off of exact repair linear regenerating codes for the case d k n 1"
    - "a framework of constructions of minimal storage regenerating codes with the optimal access update property"
    - "optimal locally repairable and secure codes for distributed storage systems"
    - "a framework of constructions of minimum storage regenerating codes with the optimal update access property for distributed storage systems based on invariant subspace technique"
    - "novel repair by transfer codes and systematic exact mbr codes with lower complexities and smaller field sizes"
    - "generalization of rashmi shah kumar minimum storage regenerating codes"
    - "on minimizing data read and download for storage node recovery"

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.IT(Information Theory)