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 throughput tradeoff in sustainable cloud ran with energy harvesting"
  Abstract: In this paper, we investigate joint beamforming for energy-throughput tradeoff in a sustainable cloud radio access network system, where multiple base stations (BSs) powered by independent renewable energy sources will collaboratively transmit wireless information and energy to the data receiver and the energy receiver simultaneously. In order to obtain the optimal joint beamforming design over a finite time horizon, we formulate an optimization problem to maximize the throughput of the data receiver while guaranteeing sufficient RF charged energy of the energy receiver. Although such problem is non-convex, it can be relaxed into a convex form and upper bounded by the optimal value of the relaxed problem. We further prove tightness of the upper bound by showing the optimal solution to the relaxed problem is rank one. Motivated by the optimal solution, an efficient online algorithm is also proposed for practical implementation. Finally, extensive simulations are performed to verify the superiority of the proposed joint beamforming strategy to other beamforming designs.

Connected through hyperedge HE-1 (induced by source paper "beamforming design for max min fair swipt in green cloud ran with wireless fronthaul"):
  with members:
    - "joint millimeter wave fronthaul and ofdma resource allocation in ultra dense cran"
    - "greendelivery proactive content caching and push with energy harvesting based small cells"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "sparse beamforming and user centric clustering for downlink cloud radio access network"
    - "group sparse beamforming for green cloud ran"
    - "coordinated multicast beamforming in multicell networks"

Connected through hyperedge HE-2 (induced by source paper "a taxonomy and future directions for sustainable cloud computing 360 degree view"):
  with members:
    - "sustainable cloud computing foundations and future directions"
    - "multi objective dynamic virtual machine consolidation in the cloud using ant colony system"
    - "software platforms for smart cities concepts requirements challenges and a unified reference architecture"
    - "optimized thermal aware job scheduling and control of data centers"
    - "energy efficient scheduling of cloud application components with brownout"
    - "sustainability aware cloud computing using virtual carbon tax"
    - "improve the sustainability of internet of things through trading based value creation"
    - "energy efficient and thermal aware resource management for heterogeneous datacenters"

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)