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We address the problem of coexistence among wireless networks in TV white space. We present a standard independent framework to enable exchange of information relevant for coexistence based on two mechanisms: centralized and distributed. Both mechanisms introduce the use of multiradio cluster-head equipment (CHE) as a physical entity that acquires relevant information, identifies coexistence opportunities,...
AbstraAbThis study addresses detection of primary users (PUs) for cognitive radio system (CRS) with distributed spectrum sensors (DSSs) in Rayleigh fading environment. Two sensing schemes using DSSs that employ energy detection (ED) are investigated as cooperative sensing and collaborative sensing. For the cooperative sensing, each DSS makes hard decision after sensing and transmits the information...
Aiken etc all, represented in JAMA that nursing staffpsilas exceeded high stress on work overload brought about nearly 20,000 patient deaths every year. According to studies from National Union of Nurses Associations and Taiwan Hospital Reform Foundation (THRF) in 2006, the average number of patients taken care by one per nurse staff is three about one to six times as many as those in other advanced...
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