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: "when does relay transmission give a more secure connection in wireless ad hoc networks"
  Abstract: Relay transmission can enhance coverage and throughput, whereas it can be vulnerable to eavesdropping attacks due to the additional transmission of the source message at the relay. Thus, whether or not one should use relay transmission for secure communication is an interesting and important problem. In this paper, we consider the transmission of a confidential message from a source to a destination in a decentralized wireless network in the presence of randomly distributed eavesdroppers. The source-destination pair can be potentially assisted by randomly distributed relays. For an arbitrary relay, we derive exact expressions of secure connection probability for both colluding and noncolluding eavesdroppers. We further obtain lower bound expressions on the secure connection probability, which are accurate when the eavesdropper density is small. Using these lower bound expressions, we propose a relay selection strategy to improve the secure connection probability. By analytically comparing the secure connection probability for direct transmission and relay transmission, we address the important problem of whether or not to relay and discuss the condition for relay transmission in terms of the relay density and source-destination distance. These analytical results are accurate in the small eavesdropper density regime.

Connected through hyperedge HE-1 (induced by source paper "secure transmission in linear multihop relaying networks"):
  with members:
    - "secure routing in multihop wireless ad hoc networks with decode and forward relaying"
    - "asymptotic deployment gain a simple approach to characterize the sinr distribution in general cellular networks"
    - "relay placement for physical layer security a secure connection perspective"
    - "an upper bound on multihop transmission capacity with dynamic routing selection"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "on the throughput cost of physical layer security in decentralized wireless networks"
    - "outage probability of general ad hoc networks in the high reliability regime"
    - "random access transport capacity"

Connected through hyperedge HE-2 (induced by source paper "secrecy rate maximization with outage constraint in multihop relaying networks"):
  with members:
    - "energy efficient routing in wireless networks in the presence of jamming"
    - "physical layer security of a buffer aided full duplex relaying system"
    - "secure routing in multihop wireless ad hoc networks with decode and forward relaying"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "energy harvesting for physical layer security in ofdma networks"
    - "optimal relay selection for physical layer security in cooperative wireless networks"
    - "relay placement for physical layer security a secure connection perspective"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"

Connected through hyperedge HE-3 (induced by source paper "secure communications in millimeter wave ad hoc networks"):
  with members:
    - "secrecy and energy efficiency in massive mimo aided heterogeneous c ran a new look at interference"
    - "artificial noise aided secure transmission in large scale spectrum sharing networks"
    - "performance analysis of outdoor mmwave ad hoc networks"
    - "physical layer security in millimeter wave cellular networks"
    - "physical layer security in heterogeneous cellular networks"
    - "tractable resource management with uplink decoupled millimeter wave overlay in ultra dense cellular networks"
    - "physical layer security in three tier wireless sensor networks a stochastic geometry approach"
    - "secrecy transmit beamforming for heterogeneous networks"

Connected through hyperedge HE-4 (induced by source paper "secure routing in multihop wireless ad hoc networks with decode and forward relaying"):
  with members:
    - "physical layer security in downlink multi antenna cellular networks"
    - "secure beamforming for mimo two way communications with an untrusted relay"
    - "optimal relay selection for physical layer security in cooperative wireless networks"
    - "physical layer security in cellular networks a stochastic geometry approach"
    - "relay placement for physical layer security a secure connection perspective"
    - "on cooperative relaying schemes for wireless physical layer security"
    - "on the throughput cost of physical layer security in decentralized wireless 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.IT(Information Theory)