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 efficient transmission for wireless energy harvesting nodes"
  Abstract: Energy harvesting is increasingly gaining importance as a means to charge battery powered devices such as sensor nodes. Efficient transmission strategies must be developed for Wireless Energy Harvesting Nodes (WEHNs) that take into account both the availability of energy and data in the node. We consider a scenario where data and energy packets arrive to the node where the time instants and amounts of the packets are known (offline approach). In this paper, the best data transmission strategy is found for a finite battery capacity WEHN that has to fulfill some Quality of Service (QoS) constraints, as well as the energy and data causality constraints. As a result of our analysis, we can state that losing energy due to overflows of the battery is inefficient unless there is no more data to transmit and that the problem may not have a feasible solution. Finally, an algorithm that computes the data transmission curve minimizing the total transmission time that satisfies the aforementioned constraints has been developed.

Connected through hyperedge HE-1 (induced by source paper "optimal compression and transmission rate control for node lifetime maximization"):
  with members:
    - "energy harvesting wireless sensor networks delay analysis considering energy costs of sensing and transmission"
    - "optimal packet scheduling on an energy harvesting broadcast link"

Connected through hyperedge HE-2 (induced by source paper "wirelessly powered crowd sensing joint power transfer sensing compression and transmission"):
  with members:
    - "privacy management and optimal pricing in people centric sensing"
    - "wirelessly powered urban crowd sensing over wearables trading energy for data"
    - "wirelessly powered backscatter communication networks modeling coverage and capacity"
    - "communications and signals design for wireless power transmission"
    - "ambient rf energy harvesting in ultra dense small cell networks performance and trade offs"
    - "resource allocation in wireless powered relay networks a bargaining game approach"
    - "simultaneous wireless information and power transfer under different csi acquisition schemes"
    - "energy efficient mobile cloud computing powered by wireless energy transfer"

Connected through hyperedge HE-3 (induced by source paper "wireless content caching for small cell and d2d networks"):
  with members:
    - "wireless device to device caching networks basic principles and system performance"
    - "order optimal rate of caching and coded multicasting with random demands"
    - "smarterphones anticipatory download scheduling for wireless video streaming"
    - "multicast aware caching for small cell networks"
    - "fundamental limits of caching in wireless d2d networks"
    - "on the complexity of optimal routing and content caching in heterogeneous networks"
    - "online coded caching"
    - "anticipatory buffer control and resource allocation for wireless video streaming"

Connected through hyperedge HE-4 (induced by source paper "solarstat modeling photovoltaic sources through stochastic markov processes"):
  with members:
    - "staying alive system design for self sufficient sensor networks"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"

Connected through hyperedge HE-5 (induced by source paper "staying alive system design for self sufficient sensor networks"):
  with members:
    - "dynamic compression transmission for energy harvesting multihop networks with correlated sources"
    - "solarstat modeling photovoltaic sources through stochastic markov processes"
    - "optimal save then transmit protocol for energy harvesting wireless transmitters"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"
    - "optimal packet scheduling in an energy harvesting communication system"
    - "optimal energy management policies for energy harvesting sensor nodes"

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)