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: "Full length article: Channel model and analysis for wireless underground sensor networks in soil medium"
  Abstract: Wireless underground sensor networks (WUSNs) constitute one of the promising application areas of the recently developed wireless sensor networking techniques. The main difference between WUSNs and the terrestrial wireless sensor networks is the communication medium. The propagation characteristics of electromagnetic (EM) waves in soil and the significant differences between propagation in air prevent a straightforward characterization of the underground wireless channel. To this end, in this paper, advanced channel models are derived to characterize the underground wireless channel and the foundational issues for efficient communication through soil are discussed. In particular, the underground communication channel is modeled considering not only the propagation of EM waves in soil, but also other effects such as multipath, soil composition, soil moisture, and burial depth. The propagation characteristics are investigated through simulation results of path loss between two underground sensors. Moreover, based on the proposed channel model, the resulting bit error rate is analyzed for different network and soil parameters. Furthermore, the effects of variations in soil moisture are investigated through field measurement results. The theoretical analysis and the simulation results prove the feasibility of wireless communication in underground environment and highlight several important aspects in this field. This work will lead to the provision of a generic framework for underground wireless communication and the realization of WUSNs.

Connected through hyperedge HE-1 (induced by source paper "A wireless sensor network For structural monitoring"):
  with members:
    - "People-centric urban sensing"
    - "Fine-grained network time synchronization using reference broadcasts"
    - "Interference-aware fair rate control in wireless sensor networks"
    - "Underground structure monitoring with wireless sensor networks"
    - "Low-Complexity Cooperative Coding for Sensor Networks using Rateless and LDGM Codes"
    - "Rethinking Data Management for Storage-centric Sensor Networks."

Connected through hyperedge HE-2 (induced by source paper "BorderSense: Border patrol through advanced wireless sensor networks"):
  with members:
    - "A novel user authentication and key agreement scheme for heterogeneous ad hoc wireless sensor networks, based on the Internet of Things notion"

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