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: "application of microgrids in addressing distribution network net load ramping"
  Abstract: In spite of all advantages of solar energy, its deployment will significantly change the typical electric load profile, thus necessitating a change in traditional distribution grid management practices. In particular, the net load ramping, created as a result of simultaneous solar generation drop and load increase at early evening hours, is one of the major operational issues that needs to be carefully addressed. In this paper, microgrids are utilized to offer a viable and localized solution to this challenge while removing the need for costly investments by the electric utility. In this regard, first the microgrid ramping capability is determined via a min-max optimization, and second, the microgrid optimal scheduling model is developed to coordinate the microgrid net load with the distribution grid net load for addressing the ramping issue. Numerical simulations on a test distribution feeder with one microgrid exhibit the effectiveness of the proposed model.

Connected through hyperedge HE-1 (induced by source paper "distribution market as a ramping aggregator for grid flexibility support"):
  with members:
    - "market based versus price based microgrid optimal scheduling"
    - "microgrid value of ramping"
    - "capturing distribution grid integrated solar variability and uncertainty using microgrids"

Connected through hyperedge HE-2 (induced by source paper "microgrid value of ramping"):
  with members:
    - "capturing distribution grid integrated solar variability and uncertainty using microgrids"
    - "application of microgrids in supporting distribution grid flexibility"
    - "leveraging microgrids for capturing uncertain distribution network net load ramping"

Connected through hyperedge HE-3 (induced by source paper "application of microgrids in supporting distribution grid flexibility"):
  with members:
    - "capturing the variabilities of distribution network net load via available flexibility of microgrids"
    - "leveraging microgrids for capturing uncertain distribution network net load ramping"

Connected through hyperedge HE-4 (induced by source paper "capturing the variabilities of distribution network net load via available flexibility of microgrids"):
  with members:
    - "leveraging microgrids for capturing uncertain distribution network net load ramping"

Connected through hyperedge HE-5 (induced by source paper "leveraging microgrids for capturing uncertain distribution network net load ramping"):
  with members:
    - "market based versus price based microgrid optimal scheduling"

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)