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 framework for robust assessment of power grid stability and resiliency"
  Abstract: Security assessment of large-scale, strongly nonlinear power grids containing thousands to millions of interacting components is a computationally expensive task. Targeting at reducing the computational cost, this paper introduces a framework for constructing a robust assessment toolbox that can provide mathematically rigorous certificates for the grids’ stability in the presence of variations in power injections, and for the grids’ ability to withstand a bunch sources of faults. By this toolbox we can “offline” screen a wide range of contingencies or power injection profiles, without reassessing the system stability on a regular basis. In particular, we formulate and solve two novel robust stability and resiliency assessment problems of power grids subject to the uncertainty in equilibrium points and uncertainty in fault-on dynamics. Furthermore, we bring in the quadratic Lyapunov functions approach to transient stability assessment, offering real-time construction of stability/resiliency certificates and real-time stability assessment. The effectiveness of the proposed techniques is numerically illustrated on a number of IEEE test cases.

Connected through hyperedge HE-1 (induced by source paper "robust control for renewable integrated power networks considering input bound constraints and worst case uncertainty measure"):
  with members:
    - "decentralized robust control for damping inter area oscillations in power systems"
    - "game theoretic multi agent control and network cost allocation under communication constraints"
    - "robust stability assessment in the presence of load dynamics uncertainty"
    - "design and stability of load side primary frequency control in power systems"

Connected through hyperedge HE-2 (induced by source paper "inverse stability problem and applications to renewables integration"):
  with members:
    - "toward simulation free estimation of critical clearing time"
    - "structural emergency control paradigm"

Connected through hyperedge HE-3 (induced by source paper "structural emergency control paradigm"):
  with members:
    - "toward simulation free estimation of critical clearing time"
    - "lyapunov functions family approach to transient stability assessment"
    - "design and stability of load side primary frequency control in power systems"

Connected through hyperedge HE-4 (induced by source paper "stability and control of ad hoc dc microgrids"):
  with members:
    - "lyapunov functions family approach to transient stability assessment"

Connected through hyperedge HE-5 (induced by source paper "a hierarchical approach to stability assessment of large scale interconnected networks"):
  with members:
    - "lyapunov functions family approach to transient stability assessment"

Connected through hyperedge HE-6 (induced by source paper "towards electronics based emergency control in power grids with high renewable penetration"):
  with members:
    - "toward simulation free estimation of critical clearing time"
    - "lyapunov functions family approach to transient stability assessment"

Connected through hyperedge HE-7 (induced by source paper "smart transmission network emergency control"):
  with members:
    - "lyapunov functions family approach to transient stability assessment"

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)