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: "Cloud computing — Issues, research and implementations"
  Abstract: ldquoCloudrdquo computing - a relatively recent term, builds on decades of research in virtualization, distributed computing, utility computing, and more recently networking, web and software services. It implies a service oriented architecture, reduced information technology overhead for the end-user, great flexibility, reduced total cost of ownership, on-demand services and many other things. This paper discusses the concept of ldquocloudrdquo computing, issues it tries to address, related research topics, and a ldquocloudrdquo implementation available today.

Connected through hyperedge HE-1 (induced by source paper "Scientific Workflow Management and the Kepler System"):
  with members:
    - "Answering queries using views: A survey"
    - "Solution Workflows for Model-Based Analysis of Complex Systems"
    - "Applying content management to automated provenance capture"

Connected through hyperedge HE-2 (induced by source paper "SLA-based admission control for a Software-as-a-Service provider in Cloud computing environments"):
  with members:
    - "Quality of service approaches in cloud computing"

Connected through hyperedge HE-3 (induced by source paper "A Layered Security Approach for Cloud Computing Infrastructure"):
  with members:
    - "Using Semantic Web Ontology for Intercloud Directories and Exchanges."

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