1,234 research outputs found
Clustering algorithm in initialization of multi-hop wireless sensor networks
In most application scenarios of wireless sensor networks (WSN), sensor nodes are usually deployed randomly and do not have any knowledge about the network environment or even their ID's at the initial stage of their operations. In this paper, we address the clustering problems with a newly deployed multi-hop WSN where most existing clustering algorithms can hardly be used due to the absence of MAC link connections among the nodes. We propose an effective clustering algorithm based on a random contention model without the prior knowledge of the network and the ID's of nodes. Computer simulations have been used to show the effectiveness of the algorithm with a relatively low complexity if compared with existing schemes
Unipolar Resistance Switching in Amorphous High-k dielectrics Based on Correlated Barrier Hopping Theory
We have proposed a kind of nonvolatile resistive switching memory based on
amorphous LaLuO3, which has already been established as a promising candidate
of high-k gate dielectric employed in transistors. Well-developed unipolar
switching behaviors in amorphous LaLuO3 make it suited for not only logic but
memory applications using the conventional semiconductor or the emerging
nano/CMOS architectures. The conduction transition between high- and low-
resistance states is attributed to the change in the separation between oxygen
vacancy sites in the light of the correlated barrier hopping theory. The mean
migration distances of vacancies responsible for the resistive switching are
demonstrated in nanoscale, which could account for the ultrafast programming
speed of 6 ns. The origin of the distributions in switching parameters in
oxides can be well understood according to the switching principle.
Furthermore, an approach has also been developed to make the operation voltages
predictable for the practical applications of resistive memories.Comment: 18 pages, 6 figure
Understanding the processes observed by Belle
We calculate the production cross sections for ,
and in annihilation through one virtual photon in the
framework of perturbative QCD with constituent quarks. The calculated cross
sections for and production are roughly in agreement
with the recent Belle data. The helicity decomposition for meson
production is also calculated. The fraction of the final
state in process is found to be 65%. The fraction of
production is 100% and is forbidden in annihilation
through one virtual photon. We further consider annihilation through
two virtual photons, and then find the fraction of in process to be about 91%.Comment: 8 pages, 2 figure
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