3,214 research outputs found
Cross-Layer Design to Maintain Earthquake Sensor Network Connectivity After Loss of Infrastructure
We present the design of a cross-layer protocol to maintain connectivity in
an earthquake monitoring and early warning sensor network in the absence of
communications infrastructure. Such systems, by design, warn of events that
severely damage or destroy communications infrastructure. However, the data
they provide is of critical importance to emergency and rescue decision making
in the immediate aftermath of such events, as is continued early warning of
aftershocks, tsunamis, or other subsequent dangers. Utilizing a beyond
line-of-sight (BLOS) HF physical layer, we propose an adaptable cross-layer
network design that meets these specialized requirements. We are able to
provide ultra high connectivity (UHC) early warning on strict time deadlines
under worst-case channel conditions along with providing sufficient capacity
for continued seismic data collection from a 1000 sensor network.Comment: To be published in MILCOM 2012 - Track 2: Networking Protocols and
Performanc
New Class of Generalized Extensive Entropies for Studying Dynamical Systems in Highly Anisotropic Phase Space
Starting from the geometrical interpretation of the R\'enyi entropy, we
introduce further extensive generalizations and study their properties. In
particular, we found the probability distribution function obtained by the
MaxEnt principle with generalized entropies. We prove that for a large class of
dynamical systems subject to random perturbations, including particle transport
in random media, these entropies play the role of Liapunov functionals. Some
physical examples, which can be treated by the generalized R\'enyi entropies
are also illustrated.Comment: 13 pages, 0 figure
Solid-state millimeter-wave power generation and amplification Final report, 1 Mar. 1966 - 28 Feb. 1970
Research and development in solid state millimeter wave power generation and amplificatio
The R\'enyi entropy of L\'evy distribution
The equivalence between non-extensive C. Tsallis entropy and the extensive
entropy introduced by Alfr\'ed R\'enyi is discussed. The R\'enyi entropy is
studied from the perspective of the geometry of the Lebesgue and generalised,
exotic Lebesgue spaces. A duality principle is established. The R\'enyi entropy
for the L\'evy distribution, in the domain when the nunerical methods fails, is
approximated by asymptotic expansion for the large values of the R\'enyi
parameter.Comment: 10 pages, 0 figure
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