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: "enhanced stiffness modeling of manipulators with passive joints"
  Abstract: The paper presents a methodology to enhance the stiffness analysis of serial and parallel manipulators with passive joints. It directly takes into account the loading influence on the manipulator configuration and, consequently, on its Jacobians and Hessians. The main contributions of this paper are the introduction of a non-linear stiffness model for the manipulators with passive joints, a relevant numerical technique for its linearization and computing of the Cartesian stiffness matrix which allows rank-deficiency. Within the developed technique, the manipulator elements are presented as pseudo-rigid bodies separated by multidimensional virtual springs and perfect passive joints. Simulation examples are presented that deal with parallel manipulators of the Ortholide family and demonstrate the ability of the developed methodology to describe non-linear behavior of the manipulator structure such as a sudden change of the elastic instability properties (buckling).

Connected through hyperedge HE-1 (induced by source paper "advancement of msa technique for stiffness modeling of serial and parallel robotic manipulators"):
  with members:
    - "cad based approach for identification of elasto static parameters of robotic manipulators"

Connected through hyperedge HE-2 (induced by source paper "accuracy improvement of robot based milling using an enhanced manipulator model"):
  with members:
    - "optimal selection of measurement configurations for stiffness model calibration of anthropomorphic manipulators"

Connected through hyperedge HE-3 (induced by source paper "cad based approach for identification of elasto static parameters of robotic manipulators"):
  with members:
    - "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"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-4 (induced by source paper "advanced robot calibration using partial pose measurements"):
  with members:
    - "design of calibration experiments for identification of manipulator elastostatic parameters"
    - "design of experiments for calibration of planar anthropomorphic manipulators"

Connected through hyperedge HE-5 (induced by source paper "compliance error compensation technique for parallel robots composed of non perfect serial chains"):
  with members:
    - "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-6 (induced by source paper "modelling of the gravity compensators in robotic manufacturing cells"):
  with members:
    - "design of experiments for calibration of planar anthropomorphic manipulators"

Connected through hyperedge HE-7 (induced by source paper "identification of geometrical and elastostatic parameters of heavy industrial robots"):
  with members:
    - "optimal selection of measurement configurations for stiffness model calibration of anthropomorphic manipulators"

Connected through hyperedge HE-8 (induced by source paper "efficiency improvement of measurement pose selection techniques in robot calibration"):
  with members:
    - "design of experiments for calibration of planar anthropomorphic 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)