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: "energy harvesting for physical layer security in ofdma networks"
  Abstract: In this paper, we study the simultaneous wireless information and power transfer (SWIPT) in downlink multiuser orthogonal frequency-division multiple access (OFDMA) systems, where each user applies power splitting scheme to coordinate the energy harvesting and secrecy information decoding processes. Assuming equal power allocation across subcarriers, we formulate the problem to maximize the aggregate harvested power of all users while satisfying secrecy rate requirement of individual user by joint subcarrier allocation and optimal power splitting ratio selection. Due to the NP-hardness of the problem, we propose two suboptimal algorithms to solve the problem in the dual domain. The first one is an iterative algorithm that optimizes subcarrier allocation and power splitting in an alternating way. The second algorithm is based on a two-step approach that solves the subcarrier allocation and power splitting sequentially. The numerical results show that the proposed methods outperform conventional methods. It is also shown that the iterative algorithm performs close to the upper bound and the step-wise algorithm provides good tradeoffs between performance and complexity.

Connected through hyperedge HE-1 (induced by source paper "secrecy outage of swipt in the presence of cooperating eavesdroppers"):
  with members:
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "secrecy wireless information and power transfer with miso beamforming"
    - "wireless information and power transfer architecture design and rate energy tradeoff"

Connected through hyperedge HE-2 (induced by source paper "wirelessly powered data aggregation for iot via over the air functional computation beamforming and power control"):
  with members:
    - "inference from randomized transmissions by many backscatter sensors"
    - "over the air function computation in sensor networks"
    - "communications and signals design for wireless power transmission"
    - "resource allocation in wireless powered relay networks a bargaining game approach"
    - "wireless powered communication opportunities and challenges"
    - "throughput optimization for massive mimo systems powered by wireless energy transfer"
    - "simultaneous wireless information and power transfer under different csi acquisition schemes"
    - "cutting last wires for mobile communication by microwave power transfer"

Connected through hyperedge HE-3 (induced by source paper "energy efficient swipt in iot distributed antenna systems"):
  with members:
    - "simultaneous wireless information and power transfer in cooperative relay networks with rateless codes"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "training based swipt optimal power splitting at the receiver"
    - "energy efficient resource assignment and power allocation in heterogeneous cloud radio access networks"
    - "information and energy cooperation in ofdm relaying protocols and optimization"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "energy beamforming with one bit feedback"

Connected through hyperedge HE-4 (induced by source paper "optimal fairness aware time and power allocation in wireless powered communication networks"):
  with members:
    - "wireless networks with energy harvesting and power transfer joint power and time allocation"
    - "adaptively directional wireless power transfer for large scale sensor networks"
    - "wireless powered communication networks an overview"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "wireless powered communication opportunities and challenges"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "throughput maximization in wireless powered communication networks"
    - "asymptotically optimal power allocation for energy harvesting communication networks"

Connected through hyperedge HE-5 (induced by source paper "joint resource allocation in swipt based multi antenna decode and forward relay networks"):
  with members:
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "relaying strategies for wireless powered mimo relay networks"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "joint wireless information and power transfer for an autonomous multiple antenna relay system"
    - "information and energy cooperation in ofdm relaying protocols and optimization"
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "enhancing wireless information and power transfer by exploiting multi antenna techniques"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"

Connected through hyperedge HE-6 (induced by source paper "probabilistically robust swipt for secrecy misome systems"):
  with members:
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "secrecy wireless information and power transfer with miso beamforming"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "wireless information transfer with opportunistic energy harvesting"
    - "wireless information and power transfer architecture design and rate energy tradeoff"

Connected through hyperedge HE-7 (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"
    - "when does relay transmission give a more secure connection in wireless ad hoc 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-8 (induced by source paper "power allocation for secure swipt systems with wireless powered cooperative jamming"):
  with members:
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "to harvest and jam a paradigm of self sustaining friendly jammers for secure af relaying"
    - "secure communication with a wireless powered friendly jammer"

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)