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: "high performance gravitational n body simulations on a planet wide distributed supercomputer"
  Abstract: We report on the performance of our cold dark matter cosmological N-body simulation that was carried out concurrently using supercomputers across the globe. We ran simulations on 60–750 cores distributed over a variety of supercomputers in Amsterdam (The Netherlands, Europe), in Tokyo (Japan, Asia), Edinburgh (UK, Europe) and Espoo (Finland, Europe). Regardless of the network latency of 0.32 s and the communication over 30 000 km of optical network cable, we are able to achieve ~87% of the performance compared to an equal number of cores on a single supercomputer. We argue that using widely distributed supercomputers in order to acquire more compute power is technically feasible and that the largest obstacle is introduced by local scheduling and reservation policies.

Connected through hyperedge HE-1 (induced by source paper "flexible composition and execution of high performance high fidelity multiscale biomedical simulations"):
  with members:
    - "impact of blood rheology on wall shear stress in a model of the middle cerebral artery"
    - "coalesced communication a design pattern for complex parallel scientific software"
    - "choice of blood rheology model has minor impact on computational assessment of shear stress mediated vascular risk"
    - "survey of multiscale and multiphysics applications and communities"
    - "a lightweight communication library for distributed computing"

Connected through hyperedge HE-2 (induced by source paper "mpwide a light weight library for efficient message passing over wide area networks"):
  with members:
    - "flexible composition and execution of high performance high fidelity multiscale biomedical simulations"
    - "high performance distributed multi model multi kernel simulations a case study in jungle computing"
    - "high performance cosmological simulations on a grid of supercomputers"
    - "a lightweight communication library for distributed computing"

Connected through hyperedge HE-3 (induced by source paper "high performance cosmological simulations on a grid of supercomputers"):
  with members:
    - "a lightweight communication library for distributed computing"
    - "mpich g2 a grid enabled implementation of the message passing interface"

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.DC(Distributed, Parallel, and Cluster Computing)