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: "Optimal file placement in VOD system using genetic algorithm"
  Abstract: Advances in computing and networking are generating a significant demand for video-on-demand (VOD) applications. In this paper, the condition for minimum blocking probability of a VOD system is derived. The optimal load-sharing requirement in such a system is found so that the minimum blocking probability is achieved. A combination of genetic algorithm and modified bin-packing algorithm is then developed for the multimedia file placement exercise. It is demonstrated that a specified blocking probability can be achieved while the capacity usage is minimized simultaneously.

Connected through hyperedge HE-1 (induced by source paper "Popularity-based assignment of movies to storage devices in a video-on-demand system"):
  with members:
    - "A Continuous Media Player"

Connected through hyperedge HE-2 (induced by source paper "Modeling of Video on Demand Systems"):
  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