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: "modelling mac layer communications in wireless systems"
  Abstract: We present a timed process calculus for modelling wireless networks in which#N#individual stations broadcast and receive messages; moreover the broadcasts are#N#subject to collisions. Based on a reduction semantics for the calculus we#N#define a contextual equivalence to compare the external behaviour of such#N#wireless networks. Further, we construct an extensional LTS (labelled#N#transition system) which models the activities of stations that can be directly#N#observed by the external environment. Standard bisimulations in this LTS#N#provide a sound proof method for proving systems contextually equivalence. We#N#illustrate the usefulness of the proof methodology by a series of examples.#N#Finally we show that this proof method is also complete, for a large class of#N#systems.

Connected through hyperedge HE-1 (induced by source paper "equational reasonings in wireless network gossip protocols"):
  with members:
    - "a probabilistic calculus of cyber physical systems"
    - "a process algebra for wireless mesh networks"
    - "fixed point characterization of compositionality properties of probabilistic processes combinators"
    - "compositionality of approximate bisimulation for probabilistic systems"
    - "an analytical model of information dissemination for a gossip based protocol"

Connected through hyperedge HE-2 (induced by source paper "a probabilistic calculus of cyber physical systems"):
  with members:
    - "state of the art of cyber physical systems security an automatic control perspective"
    - "a formal approach to cyber physical attacks"
    - "a calculus of cyber physical systems"
    - "compositional bisimulation metric reasoning with probabilistic process calculi"
    - "revisiting trace and testing equivalences for nondeterministic and probabilistic processes"

Connected through hyperedge HE-3 (induced by source paper "a calculus of cyber physical systems"):
  with members:
    - "state of the art of cyber physical systems security an automatic control perspective"
    - "a formal approach to cyber physical attacks"

Connected through hyperedge HE-4 (induced by source paper "a process algebra for wireless mesh networks"):
  with members:
    - "automated analysis of aodv using uppaal"
    - "a process algebra for wireless mesh networks used for modelling verifying and analysing aodv"
    - "sequence numbers do not guarantee loop freedom aodv can yield routing loops"
    - "modelling probabilistic wireless networks"
    - "a timed calculus for mobile ad hoc networks"

Connected through hyperedge HE-5 (induced by source paper "a semantic theory of the internet of things"):
  with members:
    - "a process algebra for wireless mesh networks"
    - "internet of things iot a vision architectural elements and future directions"

Connected through hyperedge HE-6 (induced by source paper "a process algebra for wireless mesh networks used for modelling verifying and analysing aodv"):
  with members:
    - "modelling probabilistic wireless networks"

Connected through hyperedge HE-7 (induced by source paper "modelling probabilistic wireless networks"):
  with members:
    - "a timed calculus for mobile ad hoc networks"

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.LO(Logic in Computer Science)