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: "sensing as a service model for smart cities supported by internet of things"
  Abstract: The world population is growing at a rapid pace. Towns and cities are accommodating half of the world's population thereby creating tremendous pressure on every aspect of urban living. Cities are known to have large concentration of resources and facilities. Such environments attract people from rural areas. However, unprecedented attraction has now become an overwhelming issue for city governance and politics. The enormous pressure towards efficient city management has triggered various Smart City initiatives by both government and private sector businesses to invest in ICT to find sustainable solutions to the growing issues. The Internet of Things (IoT) has also gained significant attention over the past decade. IoT envisions to connect billions of sensors to the Internet and expects to use them for efficient and effective resource management in Smart Cities. Today infrastructure, platforms, and software applications are offered as services using cloud technologies. In this paper, we explore the concept of sensing as a service and how it fits with the Internet of Things. Our objective is to investigate the concept of sensing as a service model in technological, economical, and social perspectives and identify the major open challenges and issues.

Connected through hyperedge HE-1 (induced by source paper "fog computing applications taxonomy and requirements"):
  with members:
    - "all one needs to know about fog computing and related edge computing paradigms a complete survey"
    - "fog computing a taxonomy survey and future directions"
    - "fog computing survey of trends architectures requirements and research directions"
    - "a survey of state management in big data processing systems"
    - "foglearn leveraging fog based machine learning for smart system big data analytics"
    - "understanding performance of edge content caching for mobile video streaming"
    - "sdfog a software defined computing architecture for qos aware service orchestration over edge devices"
    - "decentralized computation offloading game for mobile cloud computing"

Connected through hyperedge HE-2 (induced by source paper "privacy in internet of things from principles to technologies"):
  with members:
    - "internet of things survey on security"
    - "privacy by design framework for assessing internet of things applications and platforms"
    - "on the feasibility of attribute based encryption on internet of things devices"
    - "privacy in the internet of things threats and challenges"
    - "privacy and data protection by design from policy to engineering"
    - "privacy by design in big data an overview of privacy enhancing technologies in the era of big data analytics"
    - "internet of things iot a vision architectural elements and future directions"
    - "privacy design strategies"

Connected through hyperedge HE-3 (induced by source paper "trust evaluation mechanism for user recruitment in mobile crowd sensing in the internet of things"):
  with members:
    - "social network assisted worker recruitment in mobile crowd sensing"
    - "quality of information in mobile crowdsensing survey and research challenges"
    - "when crowdsourcing meets mobile sensing a social network perspective"
    - "mobile crowd sensing and computing when participatory sensing meets participatory social media"
    - "from participatory sensing to mobile crowd sensing"
    - "internet of things iot a vision architectural elements and future directions"
    - "pagerank standing on the shoulders of giants"
    - "supervised random walks predicting and recommending links in social networks"

Connected through hyperedge HE-4 (induced by source paper "a survey of benchmarks to evaluate data analytics for smart applications"):
  with members:
    - "towards reliable and efficient job executions in a practical geo distributed data analytics system"
    - "demystifying fog computing characterizing architectures applications and abstractions"
    - "benchmarking distributed stream processing platforms for iot applications"
    - "benchmarking big data systems state of the art and future directions"
    - "context aware computing for the internet of things a survey"
    - "internet of things iot a vision architectural elements and future directions"

Connected through hyperedge HE-5 (induced by source paper "designing sensing as a service s2aas ecosystem for internet of things"):
  with members:
    - "valorising the iot databox creating value for everyone"
    - "the emerging internet of things marketplace from an industrial perspective a survey"
    - "a survey on internet of things from industrial market perspective"
    - "money walks a human centric study on the economics of personal mobile data"

Connected through hyperedge HE-6 (induced by source paper "elfstore a resilient data storage service for federated edge and fog resources"):
  with members:
    - "violet a large scale virtual environment for internet of things"
    - "mathbb echo an adaptive orchestration platform for hybrid dataflows across cloud and edge"
    - "fogstore toward a distributed data store for fog computing"
    - "ipfs content addressed versioned p2p file system"

Connected through hyperedge HE-7 (induced by source paper "a decentralized iot data marketplace"):
  with members:
    - "idmob iot data marketplace on blockchain"
    - "mind my value a decentralized infrastructure for fair and trusted iot data trading"
    - "sensor search techniques for sensing as a service architecture for the internet of things"

Connected through hyperedge HE-8 (induced by source paper "optimal two sided market mechanism design for large scale data sharing and trading in massive iot networks"):
  with members:
    - "adaptive and resilient revenue maximizing dynamic resource allocation and pricing for cloud enabled iot systems"
    - "sensing as a service s2aas buying and selling iot data"
    - "the emerging internet of things marketplace from an industrial perspective a survey"

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.CY(Computers and Society)