human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "Task and Domain Specific Modelling in the Carnegie Mellon Communicator System"
  Abstract: Abstract : The Carnegie Mellon Communicator is a telephone-based dialog system that supports planning in a travel domain. The implementation of such a system requires two complimentary components, an architecture capable of managing interaction and the task, as well as a knowledge base that captures the speech, language and task characteristics specific to the domain. Given a suitable architecture, the principal effort in development is taken up in the acquisition and processing of a domain knowledge base. This paper describes a variety of techniques we have applied to modeling in acoustic, language, task, generation and synthesis components of the system.

Connected through hyperedge HE-1 (induced by source paper "Limited Domain Synthesis"):
  with members:
    - "High quality Spanish restricted-domain TTS oriented to a weather forecast application."

Connected through hyperedge HE-2 (induced by source paper "Language models conditioned on dialog state."):
  with members:
    (none)

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science