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: "effects of content popularity on the performance of content centric opportunistic networking an analytical approach and applications"
  Abstract: Mobile users are envisioned to exploit direct communication opportunities between their portable devices, in order to enrich the set of services they can access through cellular or WiFi networks. Sharing contents of common interest or providing access to resources or services between peers can enhance a mobile node's capabilities, offload the cellular network, and disseminate information to nodes without Internet access. Interest patterns, i.e. how many nodes are interested in each content or service (popularity), as well as how many users can provide a content or service (availability) impact the performance and feasibility of envisioned applications. In this paper, we establish an analytical framework to study the effects of these factors on the delay and success probability of a content/service access request through opportunistic communication. We also apply our framework to the mobile data offloading problem and provide insights for the optimization of its performance. We validate our model and results through realistic simulations, using datasets of real opportunistic networks.

Connected through hyperedge HE-1 (induced by source paper "show me the cache optimizing cache friendly recommendations for sequential content access"):
  with members:
    - "a learning based approach to joint content caching and recommendation at base stations"
    - "collaborative multi bitrate video caching and processing in mobile edge computing networks"
    - "soft cache hits and the impact of alternative content recommendations on mobile edge caching"
    - "placing dynamic content in caches with small population"
    - "finite length analysis of caching aided coded multicasting"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "fundamental limits of caching"
    - "relieving the wireless infrastructure when opportunistic networks meet guaranteed delays"

Connected through hyperedge HE-2 (induced by source paper "soft cache hits and the impact of alternative content recommendations on mobile edge caching"):
  with members:
    - "wireless caching technical misconceptions and business barriers"
    - "placing dynamic content in caches with small population"
    - "five disruptive technology directions for 5g"
    - "fundamental limits of caching"
    - "relieving the wireless infrastructure when opportunistic networks meet guaranteed delays"
    - "femtocaching wireless video content delivery through distributed caching helpers"

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)