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In this paper, we consider a two-hop relay-assisted cognitive downlink Orthogonal frequency-division multiple access (OFDMA) system (named as secondary system) dynamically accessing a spectrum licensed to a primary network, thereby improving the efficiency of spectrum usage. A cluster-based relay-assisted architecture is proposed for the secondary system, where relay stations are employed for minimizing...
In the past few years, great efforts have been made on the improvement of phylogenetic profile method. Most of the researches focused on the selection of reference genome, and so far as we know, no published literature proposed a weight-based phylogenetic profile. In this study, we improved phylogenetic profile method in two aspects: one was to construct weight-based profiles for target proteins;...
Typical clustering algorithms output a single clustering of the data. However, in real world applications, data can often be interpreted in many different ways; data can have different groupings that are reasonable and interesting from different perspectives. This is especially true for high-dimensional data, where different feature subspaces may reveal different structures of the data. Why commit...
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