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: "OntSum: A Semantic Query Routing Scheme in P2P Networks Based on Concise Ontology Indexing"
  Abstract: Locating desirable resources is very important for a large distributed system. However, the distributed, heterogeneous, and unstructured nature of the system makes this issue very challenging. The discovering mechanism has to be not only semantically rich, in order to cope with complex queries, but also scalable to handle large numbers of information sources. In this paper, we address these problems by proposing OntSum, an efficient peer-to-peer query routing scheme based on concise ontology indexing. Unlike most existing systems, our system does not assume a global ontology but heterogeneous ontologies. Peers in the system use their own ontologies to describe their resource knowledge and the network topology is adjusted according to peers' ontological properties. A novel indexing strategy enables forwarding queries only to semantically related nodes. The architecture improves interoperability among network participants and aids efficient resource discovery through an expressive query language.

Connected through hyperedge HE-1 (induced by source paper "Piazza: data management infrastructure for semantic web applications"):
  with members:
    - "Federated database systems for managing distributed, heterogeneous, and autonomous databases"
    - "Answering queries using views: A survey"
    - "GridVine: An Infrastructure for Peer Information Management"
    - "Alignment-based trust for resource finding in semantic P2P networks"

Connected through hyperedge HE-2 (induced by source paper "Opportunistic Linked Data Querying Through Approximate Membership Metadata"):
  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