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: "opportunistic wireless energy harvesting in cognitive radio networks"
  Abstract: Wireless networks can be self-sustaining by harvesting energy from ambient radio-frequency (RF) signals. Recently, researchers have made progress on designing efficient circuits and devices for RF energy harvesting suitable for low-power wireless applications. Motivated by this and building upon the classic cognitive radio (CR) network model, this paper proposes a novel method for wireless networks coexisting where low-power mobiles in a secondary network, called secondary transmitters (STs), harvest ambient RF energy from transmissions by nearby active transmitters in a primary network, called primary transmitters (PTs), while opportunistically accessing the spectrum licensed to the primary network. We consider a stochastic-geometry model in which PTs and STs are distributed as independent homogeneous Poisson point processes (HPPPs) and communicate with their intended receivers at fixed distances. Each PT is associated with a guard zone to protect its intended receiver from ST's interference, and at the same time delivers RF energy to STs located in its harvesting zone. Based on the proposed model, we analyze the transmission probability of STs and the resulting spatial throughput of the secondary network. The optimal transmission power and density of STs are derived for maximizing the secondary network throughput under the given outage-probability constraints in the two coexisting networks, which reveal key insights to the optimal network design. Finally, we show that our analytical result can be generally applied to a non-CR setup, where distributed wireless power chargers are deployed to power coexisting wireless transmitters in a sensor network.

Connected through hyperedge HE-1 (induced by source paper "design of an miso swipt aided code index modulated multi carrier m dcsk system for e health iot"):
  with members:
    - "fundamentals of wireless information and power transfer from rf energy harvester models to signal and system designs"
    - "modulation design for wireless information and power transfer with nonlinear energy harvester modeling"
    - "rate energy region in wireless information and power transfer new receiver architecture and practical modulation"
    - "spectral efficiency of multipair massive mimo two way relaying with hardware impairments"
    - "performance analysis of mixed adc massive mimo systems over rician fading channels"
    - "on the feasibility of wireless energy transfer using massive antenna arrays"
    - "achievable rate of rician large scale mimo channels with transceiver hardware impairments"
    - "iterative dynamic water filling for fading multiple access channels with energy harvesting"

Connected through hyperedge HE-2 (induced by source paper "analysis of d2d communication with rf energy harvesting and interference management"):
  with members:
    - "d2d communications underlaying wireless powered communication networks"
    - "energy harvesting wireless communications a review of recent advances"
    - "d2d enhanced heterogeneous cellular networks with dynamic tdd"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "cognitive and energy harvesting based d2d communication in cellular networks stochastic geometry modeling and analysis"
    - "spatial throughput of mobile ad hoc networks powered by energy harvesting"
    - "five disruptive technology directions for 5g"
    - "power control for d2d underlaid cellular networks modeling algorithms and analysis"

Connected through hyperedge HE-3 (induced by source paper "sense and predict harnessing spatial interference correlation for cognitive radio networks"):
  with members:
    - "ultra reliable and low latency communications in 5g downlink physical layer aspects"
    - "millimeter wave interference avoidance via building aware associations"
    - "the connectivity of millimeter wave networks in urban environments modeled using random lattices"
    - "macro diversity in cellular networks with random blockages"
    - "sense and predict opportunistic mac based on spatial interference correlation for cognitive radio networks"
    - "downlink and uplink cell association with traditional macrocells and millimeter wave small cells"
    - "spatio temporal interference correlation and joint coverage in cellular networks"
    - "design and analysis of initial access in millimeter wave cellular networks"

Connected through hyperedge HE-4 (induced by source paper "optimizing throughput fairness of cluster based cooperation in underlay cognitive wpcns"):
  with members:
    - "throughput maximization for uav enabled wireless powered communication networks"
    - "optimization and analysis of wireless powered multi antenna cooperative systems"
    - "multi antenna enabled cluster based cooperation in wireless powered communication networks"
    - "user cooperation for enhanced throughput fairness in wireless powered communication networks"
    - "distributed charging control in broadband wireless power transfer networks"
    - "wireless powered communication networks an overview"
    - "wireless powered communication opportunities and challenges"
    - "placement optimization of energy and information access points in wireless powered communication networks"

Connected through hyperedge HE-5 (induced by source paper "optimization of energy constrained wireless powered communication networks with heterogeneous nodes"):
  with members:
    - "placement optimization of energy and information access points in wireless powered communication networks"
    - "cognitive wireless powered network spectrum sharing models and throughput maximization"
    - "user cooperation in wireless powered communication networks"
    - "optimal resource allocation in full duplex wireless powered communication network"
    - "full duplex wireless powered communication network with energy causality"
    - "throughput maximization in wireless powered communication networks"
    - "simultaneous information and power transfer for broadband wireless systems"
    - "wireless information and power transfer architecture design and rate energy tradeoff"

Connected through hyperedge HE-6 (induced by source paper "performance analysis of energy harvesting underlay cooperative cognitive radio relay networks with randomly located nodes"):
  with members:
    - "interference aided energy harvesting cognitive relaying with multiple primary transceivers"
    - "wireless energy harvesting in a cognitive relay network"
    - "relay selection in wireless powered cooperative networks with energy storage"
    - "rf powered cognitive radio networks technical challenges and limitations"
    - "wireless information and power transfer in relay systems with multiple antennas and interference"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-7 (induced by source paper "on the secrecy performance of swipt receiver architectures with multiple eavesdroppers"):
  with members:
    - "secrecy outage for wireless sensor networks"
    - "secrecy outage of swipt in the presence of cooperating eavesdroppers"
    - "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"
    - "physical layer security jamming theoretical limits and practical designs in wireless networks"
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "simultaneous information and power transfer for broadband wireless systems"

Connected through hyperedge HE-8 (induced by source paper "optimal and low complexity dynamic spectrum access for rf powered ambient backscatter system with online reinforcement learning"):
  with members:
    - "reinforcement learning approach for rf powered cognitive radio network with ambient backscatter"
    - "stackelberg game for distributed time scheduling in rf powered backscatter cognitive radio networks"
    - "energy efficient scheduling for loss tolerant iot applications with uninformed transmitter"
    - "inference from randomized transmissions by many backscatter sensors"
    - "ambient backscatter communications a contemporary survey"
    - "mimo wiretap channel under receiver side power constraints with applications to wireless power transfer and cognitive radio"
    - "wirelessly powered backscatter communication networks modeling coverage and capacity"
    - "cognitive and energy harvesting based d2d communication in cellular networks stochastic geometry modeling and analysis"

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)