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: "Towards Semantic Web Portals."
  Abstract: portal is a platform for information presentation and information exchange over the internet in a community of interest. In order to provide adequate facilities for communication and information sharing, web portals should utilize appropriate technologies. Current web technologies used in web portals present serious limitations regarding facilities for search, access, extraction, interpretation, and processing of information. Thus, support for information sharing and communication in web portals is confined due to limitations in the underlying technologies. Semantic Web technologies have the potential to overcome these limitations, hence utilizing them as grounding technologies will facilitate much more sophisticating web portals. Following this context, the aim of this paper is to expose the idea of Semantic Web enabled web portals. Therefore we present a wide-coverage description framework along with a criteria catalogue in order to indicate possible functional improvements as well as technical requirements for such web portals in detail. Then we relay results of a survey wherein we have examined the utilization of Semantic Web technologies in existing web portals, concluding in future requirements for the development of Semantic Web enabled web portals.

Connected through hyperedge HE-1 (induced by source paper "Ontology versioning on the semantic web"):
  with members:
    - "Federated database systems for managing distributed, heterogeneous, and autonomous databases"
    - "Semantic integration: a survey of ontology-based approaches"

Connected through hyperedge HE-2 (induced by source paper "Usability inspection methods"):
  with members:
    - "Evaluation metrics and methodologies for user-centered evaluation of intelligent systems"
    - "Empirical development of a heuristic evaluation methodology for shared workspace groupware"
    - "Usability and Feasibility of PmEB: A Mobile Phone Application for Monitoring Real Time Caloric Balance"
    - "Improving mobile internet usability"
    - "Estimating the relative usability of two interfaces: heuristic, formal, and empirical methods compared"
    - "Revisiting heuristic evaluation methods to improve the reliability of findings."
    - "Investigating Heuristic Evaluation as a Methodology for Evaluating Pedagogical Software: An Analysis Employing Three Case Studies"

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