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: "plug and play voltage and frequency control of islanded microgrids with meshed topology"
  Abstract: In this paper we propose a new decentralized control scheme for Islanded microGrids (ImGs) composed by the interconnection of Distributed Generation Units (DGUs). Local controllers regulate voltage and frequency at the Point of Common Coupling (PCC) of each DGU and they are able to guarantee stability of the overall ImG. The control design procedure is decentralized, since, besides two global scalar quantities, the synthesis of a local controller uses only information on the corresponding DGU and lines connected to it. Most important, our design procedure enables Plug-and-Play (PnP) operations: when a DGU is plugged in or out, only DGUs physically connected to it have to retune their local controllers. We study the performance of the proposed controllers simulating different scenarios in MatLab/Simulink and using performance indexes proposed in IEEE standards.

Connected through hyperedge HE-1 (induced by source paper "distributed synthesis of local controllers for networked systems with arbitrary interconnection topologies"):
  with members:
    - "sequential synthesis of distributed controllers for cascade interconnected systems"
    - "provably safe cruise control of vehicular platoons"
    - "plug and play model predictive control based on robust control invariant sets"

Connected through hyperedge HE-2 (induced by source paper "a distributed scalable architecture using l1 adaptive controllers for primary voltage control of dc microgrids"):
  with members:
    - "a decentralized scalable approach to voltage control of dc islanded microgrids"

Connected through hyperedge HE-3 (induced by source paper "a scalable line independent design algorithm for voltage and frequency control in ac islanded microgrids"):
  with members:
    - "voltage stabilization in dc microgrids an approach based on line independent plug and play controllers"
    - "a survey on modeling of microgrids from fundamental physics to phasors and voltage sources"

Connected through hyperedge HE-4 (induced by source paper "voltage stabilization in dc microgrids an approach based on line independent plug and play controllers"):
  with members:
    - "a decentralized scalable approach to voltage control of dc islanded microgrids"

Connected through hyperedge HE-5 (induced by source paper "plug and play model predictive control for load shaping and voltage control in smart grids"):
  with members:
    - "smart grid communications overview of research challenges solutions and standardization activities"

Connected through hyperedge HE-6 (induced by source paper "kron reduction methods for plug and play control of ac islanded microgrids with arbitrary topology"):
  with members:
    - "a survey on modeling of microgrids from fundamental physics to phasors and voltage sources"
    - "kron reduction of generalized electrical networks"

Connected through hyperedge HE-7 (induced by source paper "a decentralized scalable approach to voltage control of dc islanded microgrids"):
  with members:
    - "plug and play model predictive control based on robust control invariant sets"

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.SY(Systems and Control)