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: "use of dynamical systems modeling to hybrid cloud database"
  Abstract: In the article, an experiment is aimed at clarifying the transfer efficiency of the database in the cloud infrastructure. The system was added to the control unit, which has guided the database search in the local part or in the cloud. It is shown that the time data acquisition remains unchanged as a result of modification. Suggestions have been made about the use of the theory of dynamic systems to hybrid cloud database. The present work is aimed at attracting the attention of specialists in the field of cloud database to the apparatus control theory. The experiment presented in this article allows the use of the description of the known methods for solving important practical problems.

Connected through hyperedge HE-1 (induced by source paper "designing applications with distributed databases in a hybrid cloud"):
  with members:
    - "optimal control of applications for hybrid cloud services"
    - "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"
    - "concept of feedback in future computing models to cloud systems"
    - "virtual laboratories in cloud infrastructure of educational institutions"

Connected through hyperedge HE-2 (induced by source paper "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"):
  with members:
    - "optimal control of applications for hybrid cloud services"
    - "concept of feedback in future computing models to cloud systems"
    - "virtual laboratories in cloud infrastructure of educational institutions"
    - "autonomic cloud computing open challenges and architectural elements"

Connected through hyperedge HE-3 (induced by source paper "virtual laboratories in cloud infrastructure of educational institutions"):
  with members:
    - "optimal control of applications for hybrid cloud services"
    - "laboratory test bench for research network and cloud computing"

Connected through hyperedge HE-4 (induced by source paper "optimal control of applications for hybrid cloud services"):
  with members:
    - "concept of feedback in future computing models to cloud systems"

Connected through hyperedge HE-5 (induced by source paper "laboratory test bench for research network and cloud computing"):
  with members:
    - "optimal control of applications for hybrid cloud services"

Connected through hyperedge HE-6 (induced by source paper "concept of feedback in future computing models to cloud systems"):
  with members:
    - "autonomic cloud computing open challenges and architectural elements"

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.DB(Databases)