8 research outputs found
Quantifying dynamical spillover in co-evolving multiplex networks
Multiplex networks (a system of multiple networks that have different types
of links but share a common set of nodes) arise naturally in a wide spectrum of
fields. Theoretical studies show that in such multiplex networks, correlated
edge dynamics between the layers can have a profound effect on dynamical
processes. However, how to extract the correlations from real-world systems is
an outstanding challenge. Here we provide a null model based on Markov chains
to quantify correlations in edge dynamics found in longitudinal data of
multiplex networks. We use this approach on two different data sets: the
network of trade and alliances between nation states, and the email and
co-commit networks between developers of open source software. We establish the
existence of "dynamical spillover" showing the correlated formation (or
deletion) of edges of different types as the system evolves. The details of the
dynamics over time provide insight into potential causal pathways
Automatic Lighting Mechanism on Highways during Midnight
This paper presents the key points in implementing automatic lighting mechanism on highway roads with the help of moving object detection in urban cities during midnight. The objective of the object detection system will be to detect objects confined in a particular area. The detection system will thus require important information like speed of moving objects, size of objects and number of vehicles on the road. The lighting system is responsible for switching off the lights in a particular area where the object detection monitoring system evaluates to a minimum threshold value. The lighting system will be active 350m to direction of the object moving in a particular direction
Entanglement transitions in random definite particle states
Entanglement within qubits are studied for the subspace of definite particle
states or definite number of up spins. A transition from an algebraic decay of
entanglement within two qubits with the total number of qubits, to an
exponential one when the number of particles is increased from two to three is
studied in detail. In particular the probability that the concurrence is
non-zero is calculated using statistical methods and shown to agree with
numerical simulations. Further entanglement within a block of qubits is
studied using the log-negativity measure which indicates that a transition from
algebraic to exponential decay occurs when the number of particles exceeds .
Several algebraic exponents for the decay of the log-negativity are
analytically calculated. The transition is shown to be possibly connected with
the changes in the density of states of the reduced density matrix, which has a
divergence at the zero eigenvalue when the entanglement decays algebraically.Comment: Substantially added content (now 24 pages, 5 figures) with a
discussion of the possible mechanism for the transition. One additional
author in this version that is accepted for publication in Phys. Rev.
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Quantifying dynamical spillover in co-evolving multiplex networks.
Multiplex networks (a system of multiple networks that have different types of links but share a common set of nodes) arise naturally in a wide spectrum of fields. Theoretical studies show that in such multiplex networks, correlated edge dynamics between the layers can have a profound effect on dynamical processes. However, how to extract the correlations from real-world systems is an outstanding challenge. Here we introduce the Multiplex Markov chain to quantify correlations in edge dynamics found in longitudinal data of multiplex networks. By comparing the results obtained from the multiplex perspective to a null model which assumes layers in a network are independent, we can identify real correlations as distinct from simultaneous changes that occur due to random chance. We use this approach on two different data sets: the network of trade and alliances between nation states, and the email and co-commit networks between developers of open source software. We establish the existence of "dynamical spillover" showing the correlated formation (or deletion) of edges of different types as the system evolves. The details of the dynamics over time provide insight into potential causal pathways