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: "Detecting Aggressive Behavior in Discussion Threads Using Text Mining"
  Abstract: The detection of aggressive behavior in online discussion communities is of great interest, due to the large number of users, especially of young age, who are frequently exposed to such behaviors in social networks. Research on cyberbullying prevention focuses on the detection of potentially harmful messages and the development of intelligent systems for the identification of verbal aggressiveness expressed with insults and threats. Text mining techniques are among the most promising tools used so far in the field of aggressive sentiments detection in short texts, such as comments, reviews, tweets etc. This article presents a novel approach which employs sentiment analysis at message level, but considers the whole communication thread (i.e., users discussions) as the context of the aggressive behavior. The suggested approach is able to detect aggressive, inappropriate or antisocial behavior, under the prism of the discussion context. Key aspects of the approach are the monitoring and analysis of the most recently published comments, and the application of text classification techniques for detecting whether an aggressive action actually emerges in a discussion thread. Thorough experimental validation of the suggested approach in a dataset for cyberbullying detection tasks demonstrates its applicability and advantages compared to other approaches.

Connected through hyperedge HE-1 (induced by source paper "Hunting for troll comments in news community forums"):
  with members:
    - "Truthy: mapping the spread of astroturf in microblog streams"

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