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: "Semantic Event Model and Its Implication on Situation Detection"
  Abstract: Events are at the core of reactive applications, which have become popular in many domains. Contemporary modeling tools lack the capability express the event semantics and relationships to other entities. This research is aimed at providing the system designer a tool to define and describe events and their relationships to other events, object and tasks. It follows the semantic data modeling approach, and applies it to events, by using the classification, aggregation, generalization and association abstractions in the event world. The model employs conditional generalizations that are specific to the event domain, and determine conditions in which an event that is classified to lower level class, is considered as a member of a higher-level event class, for the sake of reaction to the event. The paper describes the event model, its knowledge representation scheme and its properties, and demonstrates these properties through a comprehensive example.

Connected through hyperedge HE-1 (induced by source paper "Amit - the situation manager"):
  with members:
    - "Net-based analysis of event processing networks: the fast flower delivery case"
    - "PEACE-ful Web Event Extraction and Processing ?"

Connected through hyperedge HE-2 (induced by source paper "Semantic data models"):
  with members:
    - "Knowledge-based approaches to database design"
    - "An Abstract Introduction to the Temporal-Hierarchic Data Model (THM)"
    - "Understanding the term reference model in information systems research: history, literature analysis and explanation"
    - "Federated database systems for managing distributed, heterogeneous, and autonomous databases"
    - "Algebraic support for complex objects with arrays, identity, and inheritance"
    - "Uniform comparison of data models using containment modeling"

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