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: "A Layered Security Approach for Cloud Computing Infrastructure"
  Abstract: This paper introduces a practical security model based on key security considerations by looking at a number of infrastructure aspects of Cloud Computing such as SaaS, Utility, Web, Platform and Managed Services, Service commerce platforms and Internet Integration which was introduced with a concise literature review. The purpose of this paper is to offer a macro level solution for identified common infrastructure security requirements. This model with a number of emerged patterns can be applied to infrastructure aspect of Cloud Computing as a proposed shared security approach in system development life cycle focusing on the plan-built-run scope.

Connected through hyperedge HE-1 (induced by source paper "Using Semantic Web Ontology for Intercloud Directories and Exchanges."):
  with members:
    - "Inter-Cloud architectures and application brokering: taxonomy and survey"

Connected through hyperedge HE-2 (induced by source paper "Cloud computing — Issues, research and implementations"):
  with members:
    - "Scientific Workflow Management and the Kepler System"
    - "SLA-based admission control for a Software-as-a-Service provider in Cloud computing environments"

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