A low aspect ratio tokamak energy system has been proposed, which aims at the near time application of the fusion energy. This system include a low aspect ratio tokamak as fusion neutron driver, a Radioactivity Clean Nuclear power System as blanket and a novel concept of liquid metal conductor as center conductor post. On the conceptual design 100MW driver under 1MW/m 2 neutron wall loading can transmute High Level Waste(include minor nuclides and fission products) produced by 10 GW PWR, self-sustain tritium and output a great mount of energy. After the operation of 30 years, the BHP level of whole system will decreased 2 orders of magnitude.
We study energy detection based spectrum sensing of SU (Secondary User) in cognitive radios. Due to the time varying nature of wireless channels and PU (Primary User) activities, the SINR (Signal to Interference plus Noise Ratio) at the SU receiver changes from slot to slot in a time-slotted system. Unlike the conventional energy detector which uses a fixed energy threshold for spectrum sensing, we dynamically adjust the energy threshold according to the SINR. By limiting the average interference to the PU within a target level, the objective is to maximize the SU's average rate using an optimized policy function, which formulates the threshold as a linear increasing function of the SINR. Simulation results show that the SU's average rate can be significantly improved using the optimized function for dynamic threshold control.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.