3,827 research outputs found
Distributed Relay Protocol for Probabilistic Information-Theoretic Security in a Randomly-Compromised Network
We introduce a simple, practical approach with probabilistic
information-theoretic security to mitigate one of quantum key distribution's
major limitations: the short maximum transmission distance (~200 km) possible
with present day technology. Our scheme uses classical secret sharing
techniques to allow secure transmission over long distances through a network
containing randomly-distributed compromised nodes. The protocol provides
arbitrarily high confidence in the security of the protocol, with modest
scaling of resource costs with improvement of the security parameter. Although
some types of failure are undetectable, users can take preemptive measures to
make the probability of such failures arbitrarily small.Comment: 12 pages, 2 figures; added proof of verification sub-protocol, minor
correction
The ECMWF Ensemble Prediction System: Looking Back (more than) 25 Years and Projecting Forward 25 Years
This paper has been written to mark 25 years of operational medium-range
ensemble forecasting. The origins of the ECMWF Ensemble Prediction System are
outlined, including the development of the precursor real-time Met Office
monthly ensemble forecast system. In particular, the reasons for the
development of singular vectors and stochastic physics - particular features of
the ECMWF Ensemble Prediction System - are discussed. The author speculates
about the development and use of ensemble prediction in the next 25 years.Comment: Submitted to Special Issue of the Quarterly Journal of the Royal
Meteorological Society: 25 years of ensemble predictio
Multi-facet determination for clustering with Bayesian networks
Real world applications of sectors like industry, healthcare or finance usually generate data of
high complexity that can be interpreted from different viewpoints. When clustering this type of
data, a single set of clusters may not suffice, hence the necessity of methods that generate multiple
clusterings that represent different perspectives. In this paper, we present a novel multi-partition
clustering method that returns several interesting and non-redundant solutions, where each of them
is a data partition with an associated facet of data. Each of these facets represents a subset of the
original attributes that is selected using our information-theoretic criterion UMRMR. Our approach
is based on an optimization procedure that takes advantage of the Bayesian network factorization
to provide high quality solutions in a fraction of the time
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