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: "a reference architecture for smart and software defined buildings"
  Abstract: The vision encompassing Smart and Software-defined Buildings (SSDB) is becoming more and more popular and its implementation is now more accessible due to the widespread adoption of the IoT infrastructure. Some of the most important applications sustaining this vision are energy management, environmental comfort, safety and surveillance. This paper surveys IoT and SSB technologies and their cooperation towards the realization of Smart Spaces. We propose a four-layer reference architecture and we organize related concepts around it. This conceptual frame is useful to identify the current literature on the topic and to connect the dots into a coherent vision of the future of residential and commercial buildings.

Connected through hyperedge HE-1 (induced by source paper "towards blockchain based multi agent robotic systems analysis classification and applications"):
  with members:
    - "interacting with the internet of things using smart contracts and blockchain technologies"
    - "controlling robots using artificial intelligence and a consortium blockchain"
    - "blockchain solutions for multi agent robotic systems related work and open questions"
    - "towards the internet of robotic things analysis architecture components and challenges"
    - "robochain a secure data sharing framework for human robot interaction"
    - "an architecture for distributed ledger based m2m auditing for electric autonomous vehicles"
    - "smart contracts for multiagent plan execution in untrusted cyber physical systems"
    - "towards blockchain based robonomics autonomous agents behavior validation"

Connected through hyperedge HE-2 (induced by source paper "size matters microservices research and applications"):
  with members:
    - "teaching devops in academia and industry reflections and vision"
    - "teaching devops in corporate environments an experience report"
    - "open source platform digital personal assistant"
    - "microservices a language based approach"
    - "jolie static type checker a prototype"
    - "microservices science and engineering"
    - "microservices yesterday today and tomorrow"
    - "refinement types in jolie"

Connected through hyperedge HE-3 (induced by source paper "blockchain solutions for multi agent robotic systems related work and open questions"):
  with members:
    - "controlling robots using artificial intelligence and a consortium blockchain"
    - "robochain a secure data sharing framework for human robot interaction"
    - "smart contracts for multiagent plan execution in untrusted cyber physical systems"
    - "towards blockchain based robonomics autonomous agents behavior validation"
    - "the blockchain a new framework for robotic swarm systems"

Connected through hyperedge HE-4 (induced by source paper "towards the internet of robotic things analysis architecture components and challenges"):
  with members:
    - "robots as a service in cloud computing search and rescue in large scale disasters case study"
    - "antibiotic protecting iot devices against ddos attacks"
    - "the internet of hackable things"
    - "deriving specifications of dependable systems toward a method"

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.SE(Software Engineering)