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: "beyond traditional dtn routing social networks for opportunistic communication"
  Abstract: This article examines the evolution of routing protocols for intermittently connected ad hoc networks and discusses the trend toward socialbased routing protocols. A survey of current routing solutions is presented, where routing protocols for opportunistic networks are classified based on the network graph employed. The need to capture performance trade-offs from a multi-objective perspective is highlighted.

Connected through hyperedge HE-1 (induced by source paper "cluster aware mobility encounter dataset enlargement"):
  with members:
    - "analysis of spatio temporal preferences and encounter statistics for dtn performance"
    - "the heterogeneity of inter contact time distributions its importance for routing in delay tolerant networks"

Connected through hyperedge HE-2 (induced by source paper "survey of important issues in uav communication networks"):
  with members:
    - "global mibility and handover management for heterogeneous network in vanet"
    - "a survey on energy efficiency for wireless mesh network"
    - "a survey of delay tolerant networks routing protocols"
    - "an energy efficient multichannel mac protocol for cognitive radio ad hoc networks"
    - "exploiting dynamic workload variation in low energy preemptive task scheduling"

Connected through hyperedge HE-3 (induced by source paper "socially aware networking a survey"):
  with members:
    - "swim a simple model to generate small mobile worlds"
    - "dtn routing in a mobility pattern space"

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.NI(Networking and Internet Architecture)