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Cognitive Radio Networks (CRNs) have been envisioned as a solution for frequency spectrum-scarcity and spectrum misuse issues. Since the requirement for cooperation and dynamism increases with the new spectrum access approach, time synchronization is mandatory for ensuring the proper operation of CRNs. In this paper, we propose DCR-Sync, a novel time(More)
This paper reports on an investigation focusing on improving the reliability and efficiency in current database-oriented search-and-retrieval mechanisms in e-learning applications through the use of topic map technology (ISO/IEC 13250). The development of our topic maps is grounded in a theory of cognitive information-processing and information retrieval.(More)
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