Wanfang Zhang

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In this paper, we consider the problem of hierarchical bandwidth sharing in cognitive radio (CR) environment. In the system model under consideration, a primary service provider (PSP) can sell its available spectrum bandwidth to a secondary service provider (SSP). In contrast to the conventional schemes, the SUs served by the SSP can also share the unsold(More)
  • Wanfang Zhang
  • 2012 2nd International Conference on Consumer…
  • 2012
The traditional translation teaching is teacher-centered and lacks the interaction between teachers and students. Constructivism emphasizes that learners' learning occurs in the interaction with others. Therefore, how to apply modern network technologies into the interactive activities in after-class translation practice is worth exploring. This paper(More)
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