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: "robust an aided beamforming and power splitting design for secure miso cognitive radio with swipt"
  Abstract: A multiple-input single-output cognitive radio downlink network is studied with simultaneous wireless information and power transfer. In this network, a secondary user coexists with multiple primary users and multiple energy harvesting receivers. In order to guarantee secure communication and energy harvesting, the problem of robust secure artificial noise-aided beamforming and power splitting design is investigated under imperfect channel state information (CSI). Specifically, the transmit power minimization problem and the max-min fairness energy harvesting problem are formulated for both the bounded CSI error model and the probabilistic CSI error model. These problems are non-convex and challenging to solve. A one-dimensional search algorithm is proposed to solve these problems based on ${\cal S}\text{-Procedure} $ under the bounded CSI error model and based on Bernstein-type inequalities under the probabilistic CSI error model. It is shown that the optimal robust secure beamforming can be achieved under the bounded CSI error model, whereas a suboptimal beamforming solution can be obtained under the probabilistic CSI error model. A tradeoff is elucidated between the secrecy rate of the secondary user receiver and the energy harvested by the energy harvesting receivers under a max-min fairness criterion.

Connected through hyperedge HE-1 (induced by source paper "secure millimeter wave cloud radio access networks relying on microwave multicast fronthaul"):
  with members:
    - "hybrid precoding based millimeter wave massive mimo noma with simultaneous wireless information and power transfer"
    - "optimized base station cache allocation for cloud radio access network with multicast backhaul"
    - "safeguarding millimeter wave communications against randomly located eavesdroppers"
    - "energy efficient power allocation in millimeter wave massive mimo with non orthogonal multiple access"
    - "adaptive coding and modulation for large scale antenna array based aeronautical communications in the presence of co channel interference"
    - "energy efficient joint congestion control and resource optimization in heterogeneous cloud radio access networks"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "secure communications in millimeter wave ad hoc networks"

Connected through hyperedge HE-2 (induced by source paper "energy efficient resource allocation for secure noma enabled mobile edge computing networks"):
  with members:
    - "securing downlink massive mimo noma networks with artificial noise"
    - "joint power and time allocation for noma mec offloading"
    - "improving anti eavesdropping ability without eavesdropper s csi a practical secure transmission design perspective"
    - "joint computation and communication cooperation for energy efficient mobile edge computing"
    - "exploiting physical layer security for multiuser multicarrier computation offloading"
    - "edge computing aware noma for 5g networks"
    - "impact of non orthogonal multiple access on the offloading of mobile edge computing"
    - "robust and secure resource allocation for full duplex miso multicarrier noma systems"

Connected through hyperedge HE-3 (induced by source paper "secure transmission and self energy recycling with partial eavesdropper csi"):
  with members:
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "proactive eavesdropping in relaying systems"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "secure communications in the presence of a buffer aided wireless powered relay with self energy recycling"
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "secure massive mimo transmission with an active eavesdropper"
    - "secure communication via a wireless energy harvesting untrusted relay"
    - "full duplex wireless powered relay with self energy recycling"

Connected through hyperedge HE-4 (induced by source paper "enhancing phy security of miso noma swipt systems with a practical non linear eh model"):
  with members:
    - "joint pilot and payload power control for uplink mimo noma with mrc sic receivers"
    - "optimal resource allocation for power efficient mc noma with imperfect channel state information"
    - "secure swipt networks based on a non linear energy harvesting model"
    - "spectrum and energy efficient beamspace mimo noma for millimeter wave communications using lens antenna array"
    - "joint beamforming and power splitting control in downlink cooperative swipt noma systems"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "secrecy sum rate maximization in non orthogonal multiple access"
    - "energy efficient transmission design in non orthogonal multiple access"

Connected through hyperedge HE-5 (induced by source paper "energy sustainable iot with individual qos constraints through miso swipt multicasting"):
  with members:
    - "jointly optimal spatial channel assignment and power allocation for mimo swipt systems"
    - "random access analysis for massive iot networks under a new spatio temporal model a stochastic geometry approach"
    - "power allocation and scheduling for swipt systems with non linear energy harvesting model"
    - "joint beamforming design for multi user wireless information and power transfer"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "joint transmit beamforming and receive power splitting for miso swipt systems"
    - "beamforming for miso interference channels with qos and rf energy transfer"
    - "robust beamforming for wireless information and power transmission"

Connected through hyperedge HE-6 (induced by source paper "resource allocation for secure miso noma cognitive radios relying on swipt"):
  with members:
    - "energy efficient noma enabled heterogeneous cloud radio access networks"
    - "secure swipt networks based on a non linear energy harvesting model"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "nonorthogonal multiple access in large scale underlay cognitive radio networks"
    - "secrecy sum rate maximization in non orthogonal multiple access"
    - "on the design of secure non orthogonal multiple access systems"
    - "wireless networks with rf energy harvesting a contemporary survey"

Connected through hyperedge HE-7 (induced by source paper "robust resource allocation for miso cognitive radio networks under two practical non linear energy harvesting models"):
  with members:
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "simultaneous wireless information and power transfer in modern communication systems"

Connected through hyperedge HE-8 (induced by source paper "robust chance constrained optimization for power efficient and secure swipt systems"):
  with members:
    - "probabilistically robust swipt for secrecy misome systems"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "safe and secure wireless power transfer networks challenges and opportunities in rf based systems"
    - "wireless powered communication networks an overview"
    - "multi objective resource allocation in full duplex swipt systems"
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "ambient rf energy harvesting in ultra dense small cell networks performance and trade offs"
    - "secrecy transmit beamforming for heterogeneous 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)