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: "stiffness analysis of overconstrained parallel manipulators"
  Abstract: The paper presents a new stiffness modeling method for overconstrained parallel manipulators with flexible links and compliant actuating joints. It is based on a multidimensional lumped-parameter model that replaces the link flexibility by localized 6-dof virtual springs that describe both translational/rotational compliance and the coupling between them. In contrast to other works, the method involves a FEA-based link stiffness evaluation and employs a new solution strategy of the kinetostatic equations for the unloaded manipulator configuration, which allows computing the stiffness matrix for the overconstrained architectures, including singular manipulator postures. The advantages of the developed technique are confirmed by application examples, which deal with comparative stiffness analysis of two translational parallel manipulators of 3-PUU and 3-PRPaR architectures. Accuracy of the proposed approach was evaluated for a case study, which focuses on stiffness analysis of Orthoglide parallel manipulator.

Connected through hyperedge HE-1 (induced by source paper "cad based approach for identification of elasto static parameters of robotic manipulators"):
  with members:
    - "enhanced stiffness modeling of manipulators with passive joints"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-2 (induced by source paper "stiffness modeling of non perfect parallel manipulators"):
  with members:
    - "cartesian stiffness matrix of manipulators with passive joints analytical approach"
    - "enhanced stiffness modeling of manipulators with passive joints"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-3 (induced by source paper "stiffness matrix of manipulators with passive joints computational aspects"):
  with members:
    - "cartesian stiffness matrix of manipulators with passive joints analytical approach"

Connected through hyperedge HE-4 (induced by source paper "enhanced stiffness modeling of manipulators with passive joints"):
  with members:
    - "stiffness analysis of parallel manipulators with preloaded passive joints"
    - "stiffness analysis of multi chain parallel robotic systems"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "stiffness analysis of 3 d o f overconstrained translational parallel manipulators"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
    - "parametric stiffness analysis of the orthoglide"
    - "design strategies for the geometric synthesis of orthoglide type mechanisms"

Connected through hyperedge HE-5 (induced by source paper "cartesian stiffness matrix of manipulators with passive joints analytical approach"):
  with members:
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-6 (induced by source paper "performance evaluation of parallel manipulators for milling application"):
  with members:
    - "enhanced stiffness modeling of manipulators with passive joints"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-7 (induced by source paper "stiffness modelling of parallelogram based parallel manipulators"):
  with members:
    - "stiffness analysis of multi chain parallel robotic systems"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-8 (induced by source paper "stiffness analysis of parallel manipulators with preloaded passive joints"):
  with members:
    - "stiffness analysis of multi chain parallel robotic systems"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"

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.RO(Robotics)