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: "parametric stiffness analysis of the orthoglide"
  Abstract: This paper presents a parametric stiffness analysis of the Orthoglide. A compliant modeling and a symbolic expression of the stiffness matrix are conducted. This allows a simple systematic analysis of the influence of the geometric design parameters and to quickly identify the critical link parameters. Our symbolic model is used to display the stiffest areas of the workspace for a specific machining task. Our approach can be applied to any parallel manipulator for which stiffness is a critical issue.

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"
    - "stiffness analysis of overconstrained parallel manipulators"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"

Connected through hyperedge HE-2 (induced by source paper "compliance error compensation technique for parallel robots composed of non perfect serial chains"):
  with members:
    - "enhanced stiffness modeling of manipulators with passive joints"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"

Connected through hyperedge HE-3 (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"
    - "stiffness analysis of overconstrained parallel manipulators"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"

Connected through hyperedge HE-4 (induced by source paper "compensation of compliance errors in parallel manipulators composed of non perfect kinematic chains"):
  with members:
    - "enhanced stiffness modeling of manipulators with passive joints"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"

Connected through hyperedge HE-5 (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"
    - "stiffness analysis of overconstrained parallel manipulators"
    - "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"
    - "design strategies for the geometric synthesis of orthoglide type mechanisms"

Connected through hyperedge HE-6 (induced by source paper "cartesian stiffness matrix of manipulators with passive joints analytical approach"):
  with members:
    - "stiffness analysis of overconstrained parallel manipulators"
    - "accuracy improvement for stiffness modeling of parallel manipulators"

Connected through hyperedge HE-7 (induced by source paper "performance evaluation of parallel manipulators for milling application"):
  with members:
    - "enhanced stiffness modeling of manipulators with passive joints"
    - "stiffness analysis of overconstrained parallel manipulators"
    - "accuracy improvement for stiffness modeling of parallel manipulators"
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"

Connected through hyperedge HE-8 (induced by source paper "stiffness modelling of parallelogram based parallel manipulators"):
  with members:
    - "stiffness analysis of multi chain parallel robotic systems"
    - "stiffness analysis of overconstrained parallel manipulators"
    - "accuracy improvement for stiffness modeling of parallel manipulators"

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)