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: "optimum header positioning in successive interference cancellation sic based aloha"
  Abstract: Random Access MAC protocols are simple and effective when the nature of the traffic is unpredictable and sporadic. In the following paper, investigations on the new Enhanced Contention Resolution ALOHA (ECRA) are presented, where some new aspects of the protocol are investigated. Mathematical derivation and numerical evaluation of the symbol interference probability after SIC are here provided. Results of the optimum header positioning which is found to be in the beginning and in the end of the packets, are exploited for the evaluation of ECRA throughput and Packet Error Rate (PER) under imperfect knowledge of packets positions. Remarkable gains in the maximum throughput are observed for ECRA w.r.t. Contention Resolution ALOHA (CRA) under this assumption.

Connected through hyperedge HE-1 (induced by source paper "enhancing contention resolution aloha using combining techniques"):
  with members:
    - "error floor analysis of coded slotted aloha over packet erasure channels"
    - "all to all broadcast for vehicular networks based on coded slotted aloha"
    - "coded slotted aloha a graph based method for uncoordinated multiple access"
    - "cooperative slotted aloha for multi base station systems"
    - "the throughput of slotted aloha with diversity"
    - "aloha random access that operates as a rateless code"
    - "sliding window based contention resolution diversity slotted aloha"
    - "enhanced contention resolution aloha ecra"

Connected through hyperedge HE-2 (induced by source paper "detection and combining techniques for asynchronous random access with time diversity"):
  with members:
    - "enhancing contention resolution aloha using combining techniques"
    - "all to all broadcast for vehicular networks based on coded slotted aloha"
    - "cooperative slotted aloha for multi base station systems"
    - "aloha random access that operates as a rateless code"
    - "enhanced contention resolution aloha ecra"
    - "frameless aloha protocol for wireless networks"

Connected through hyperedge HE-3 (induced by source paper "exploiting combination techniques in random access mac protocols enhanced contention resolution aloha"):
  with members:
    - "coded slotted aloha a graph based method for uncoordinated multiple access"
    - "aloha random access that operates as a rateless code"
    - "sliding window based contention resolution diversity slotted aloha"
    - "frameless aloha protocol for wireless networks"
    - "on the stability of contention resolution diversity slotted aloha crdsa"

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)