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: "architecture optimization of a 3 dof translational parallel mechanism for machining applications the orthoglide"
  Abstract: This paper addresses the architecture optimization of a 3-DOF translational parallel mechanism designed for machining applications. The design optimization is conducted on the basis of a prescribed Cartesian workspace with prescribed kinetostatic performances. The resulting machine, the Orthoglide, features three fixed parallel linear joints which are mounted orthogonally and a mobile platform which moves in the Cartesian x-y-z space with fixed orientation. The interesting features of the Orthoglide are a regular Cartesian workspace shape, uniform performances in all directions and good compactness. A small-scale prototype of the Orthoglide under development is presented at the end of this paper.

Connected through hyperedge HE-1 (induced by source paper "a translational three degrees of freedom parallel mechanism with partial motion decoupling and analytic direct kinematics"):
  with members:
    - "design of a 3 axis parallel machine tool for high speed machining the orthoglide"
    - "a comparative study of parallel kinematic architectures for machining applications"
    - "workspace analysis of the orthoglide using interval analysis"

Connected through hyperedge HE-2 (induced by source paper "optimal motion of flexible objects with oscillations elimination at the final point"):
  with members:
    - "kinematic analysis and trajectory planning of the orthoglide 5 axis"

Connected through hyperedge HE-3 (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"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-4 (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"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-5 (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"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-6 (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"
    - "parametric stiffness analysis of the orthoglide"

Connected through hyperedge HE-7 (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"
    - "parametric stiffness analysis of the orthoglide"
    - "design strategies for the geometric synthesis of orthoglide type mechanisms"

Connected through hyperedge HE-8 (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"
    - "parametric stiffness analysis of 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)