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: "relay selection for simultaneous information transmission and wireless energy transfer a tradeoff perspective"
  Abstract: In certain applications, relay terminals can be employed to simultaneously deliver information and energy to a designated receiver and a radio frequency (RF) energy harvester, respectively. In such scenarios, the relay that is preferable for information transmission does not necessarily coincide with the relay with the strongest channel to the energy harvester, since the corresponding channels fade independently. Relay selection thus entails a tradeoff between the efficiency of the information transfer to the receiver and the amount of energy transferred to the energy harvester. The study of this tradeoff is the subject on which this work mainly focuses. Specifically, we investigate the behavior of the ergodic capacity and the outage probability of the information transmission to the receiver, for a given amount of energy transferred to the RF energy harvester. We propose two relay selection methods that apply to any number of available relays. Furthermore, for the case of two relays, we develop the optimal relay selection method in a maximum capacity / minimum outage probability sense, for a given energy transfer constraint. A close-to-optimal selection method that is easier to analyze than the optimal one is also examined. Closed-form expressions for the capacity-energy and the outage-energy tradeoffs of the developed schemes are provided and corroborated by simulations. Interesting insights on the aforementioned tradeoffs are obtained.

Connected through hyperedge HE-1 (induced by source paper "on maximizing information reliability in wireless powered cooperative networks"):
  with members:
    - "sensitive and nonlinear far field rf energy harvesting in wireless communications"
    - "ergodic capacity analysis of wireless powered af relaying systems over alpha µ fading channels"
    - "joint relay selection and power allocation in large scale mimo systems with untrusted relays and passive eavesdroppers"
    - "error performance of wireless powered cognitive relay networks with interference alignment"
    - "minimizing outage probability by exploiting csi in wireless powered cooperative networks"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "wireless information and power transfer in relay systems with multiple antennas and interference"

Connected through hyperedge HE-2 (induced by source paper "wireless powered dual hop multi antenna relaying systems impact of csi and antenna correlation"):
  with members:
    - "on the performance of multi antenna wireless powered communications with energy beamforming"
    - "an overview of sustainable green 5g networks"
    - "training based swipt optimal power splitting at the receiver"
    - "joint wireless information and power transfer for an autonomous multiple antenna relay system"
    - "wireless powered communications performance analysis and optimization"
    - "energy efficient resource allocation for wireless powered communication networks"
    - "wireless information and power transfer in relay systems with multiple antennas and interference"
    - "harvest then cooperate wireless powered cooperative communications"

Connected through hyperedge HE-3 (induced by source paper "wireless powered communications with finite battery and finite blocklength"):
  with members:
    - "ultra reliable short message relaying with wireless power transfer"
    - "wireless networks with energy harvesting and power transfer joint power and time allocation"
    - "wireless powered two way relaying with power splitting based energy accumulation"
    - "accumulate then forward an opportunistic relaying protocol for wireless powered cooperative communications"
    - "wireless powered relaying with finite block length codes"
    - "blocklength limited performance of relaying under quasi static rayleigh channels"
    - "on wirelessly powered communications with short packets"
    - "towards massive ultra reliable and low latency wireless communication with short packets"

Connected through hyperedge HE-4 (induced by source paper "adaptively directional wireless power transfer for large scale sensor networks"):
  with members:
    - "green 5g heterogeneous networks through dynamic small cell operation"
    - "energy group buying with loading sharing for green cellular networks"
    - "wireless powered communication opportunities and challenges"
    - "spatial throughput maximization of wireless powered communication networks"
    - "user cooperation in wireless powered communication networks"
    - "energy beamforming with one bit feedback"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"

Connected through hyperedge HE-5 (induced by source paper "distributed multi relay selection in accumulate then forward energy harvesting relay networks"):
  with members:
    - "wireless powered communication opportunities and challenges"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "relay selection in wireless powered cooperative networks with energy storage"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "full duplex mimo relaying powered by wireless energy transfer"
    - "wireless powered communications performance analysis and optimization"
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"

Connected through hyperedge HE-6 (induced by source paper "multipair two way relay network with harvest then transmit users resolving pairwise uplink downlink coupling"):
  with members:
    - "rank two beamforming and power allocation in multicasting relay networks"
    - "on the efficiency of far field wireless power transfer"
    - "joint beamforming optimization and power control for full duplex mimo two way relay channel"
    - "spatial domain simultaneous information and power transfer for mimo channels"
    - "joint transceiver and power splitter design over two way relaying channel with lattice codes and energy harvesting"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "beamforming for miso interference channels with qos and rf energy transfer"

Connected through hyperedge HE-7 (induced by source paper "on the performance of multi antenna wireless powered communications with energy beamforming"):
  with members:
    - "resource allocation in wireless networks with rf energy harvesting and transfer"
    - "wireless powered communication opportunities and challenges"
    - "an adaptive transmission protocol for wireless powered cooperative communications"
    - "harvest then cooperate wireless powered cooperative communications"
    - "wireless powered cooperative communications via a hybrid relay"
    - "user cooperation in wireless powered communication networks"
    - "multi user scheduling schemes for simultaneous wireless information and power transfer over fading channels"
    - "power allocation strategies in energy harvesting wireless cooperative networks"

Connected through hyperedge HE-8 (induced by source paper "resource allocation in wireless powered relay networks a bargaining game approach"):
  with members:
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "noncoherent relaying in energy harvesting communication systems"
    - "joint resource optimization for multicell networks with wireless energy harvesting relays"
    - "wireless charger networking for mobile devices fundamentals standards and applications"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "full duplex wireless powered relay with self energy recycling"
    - "power allocation strategies in energy harvesting wireless cooperative networks"
    - "simultaneous information and energy transfer in large scale networks with without relaying"

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)