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: "the human body and millimeter wave wireless communication systems interactions and implications"
  Abstract: With increasing interest in millimeter wave wireless communications, investigations on interactions between the human body and millimeter wave devices are becoming important. This paper gives examples of current regulatory requirements, and provides an example for a 60 GHz transceiver. Also, the propagation characteristics of millimeter-waves in the presence of the human body are studied, and four models representing different body parts are considered to evaluate thermal effects of millimeter-wave radiation on the body. Simulation results show that about 34% to 42% of the incident power is reflected at the skin surface at 60 GHz. This paper shows that power density is not suitable to determine exposure compliance when millimeter wave devices are used very close to the body. A temperature-based technique for the evaluation of safety compliance is proposed in this paper.

Connected through hyperedge HE-1 (induced by source paper "propagation measurement system and approach at 140 ghz moving to 6g and above 100 ghz"):
  with members:
    - "simulating motion incorporating spatial consistency into the nyusim channel model"
    - "millimeter wave extended nyusim channel model for spatial consistency"
    - "verification and calibration of antenna cross polarization discrimination and penetration loss for millimeter wave communications"
    - "position locationing for millimeter wave systems"
    - "indoor office wideband penetration loss measurements at 73 ghz"
    - "investigation and comparison of 3gpp and nyusim channel models for 5g wireless communications"
    - "a flexible wideband millimeter wave channel sounder with local area and nlos to los transition measurements"
    - "a novel millimeter wave channel simulator and applications for 5g wireless communications"

Connected through hyperedge HE-2 (induced by source paper "beamforming in millimeter wave systems prototyping and measurement results"):
  with members:
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "frequency selective hybrid precoding for limited feedback millimeter wave systems"
    - "hybrid mimo architectures for millimeter wave communications phase shifters or switches"
    - "five disruptive technology directions for 5g"
    - "millimeter wave beamforming for wireless backhaul and access in small cell networks"

Connected through hyperedge HE-3 (induced by source paper "mitigation of human exposure to rf fields in downlink of millimeter wave cellular systems"):
  with members:
    - "millimeter wave channel modeling and cellular capacity evaluation"

Connected through hyperedge HE-4 (induced by source paper "enclosed mmwave wearable networks feasibility and performance"):
  with members:
    - "device to device millimeter wave communications interference coverage rate and finite topologies"
    - "an analytical framework for device to device communication in cellular networks"
    - "analysis of millimeter wave networked wearables in crowded environments"
    - "a survey of millimeter wave mmwave communications for 5g opportunities and challenges"
    - "adaptive millimeter wave beam alignment for dual polarized mimo systems"
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "what will 5g be"
    - "five disruptive technology directions for 5g"

Connected through hyperedge HE-5 (induced by source paper "millimeter wave energy harvesting"):
  with members:
    - "wireless powered communication opportunities and challenges"
    - "performance analysis of ambient rf energy harvesting with repulsive point process modeling"
    - "energy harvesting wireless communications a review of recent advances"
    - "powering the next billion devices with wi fi"
    - "tractable model for rate in self backhauled millimeter wave cellular networks"
    - "cognitive and energy harvesting based d2d communication in cellular networks stochastic geometry modeling and analysis"
    - "coverage and rate analysis for millimeter wave cellular networks"
    - "millimeter wave cellular wireless networks potentials and challenges"

Connected through hyperedge HE-6 (induced by source paper "resource sharing in 5g mmwave cellular networks"):
  with members:
    - "millimeter wave cellular networks a mac layer perspective"
    - "on the feasibility of sharing spectrum licenses in mmwave cellular systems"
    - "3 d statistical channel model for millimeter wave outdoor mobile broadband communications"
    - "sensing for spectrum sharing in cognitive lte a cellular networks"
    - "millimeter wave cellular wireless networks potentials and challenges"
    - "millimeter wave channel modeling and cellular capacity evaluation"

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.ET(Emerging Technologies)