792 research outputs found
MEDAL: An AI-Driven Data Fabric Concept for Elastic Cloud-to-Edge Intelligence
Current Cloud solutions for Edge Computing are inefficient for data-centric
applications, as they focus on the IaaS/PaaS level and they miss the data
modeling and operations perspective. Consequently, Edge Computing opportunities
are lost due to cumbersome and data assets-agnostic processes for end-to-end
deployment over the Cloud-to-Edge continuum. In this paper, we introduce MEDAL,
an intelligent Cloud-to-Edge Data Fabric to support Data Operations
(DataOps)across the continuum and to automate management and orchestration
operations over a combined view of the data and the resource layer. MEDAL
facilitates building and managing data workflows on top of existing flexible
and composable data services, seamlessly exploiting and federating
IaaS/PaaS/SaaS resources across different Cloud and Edge environments. We
describe the MEDAL Platform as a usable tool for Data Scientists and Engineers,
encompassing our concept and we illustrate its application though a connected
cars use case
Differences in approach run kinematics: successful vs. unsuccessful jumps in the pole vault
This study investigated biomechanical differences between successful and unsuccessful jumps during a pole vault competition. Two hundred and seven pairs of successful and unsuccessful jumps at the same height were analysed. Participants included male and female athletes of three different age groups with bar height clearances ranging from 2.81 to 5.91 m. Run-up parameters were collected using an Optojump Next system and a Stalker Pro II radar gun. A 2D kinematical analysis was conducted to obtain selected parameters of the take-off. Only trivial and small differences were found between successful and unsuccessful jumps. The speed at last touchdown showed a significant small difference between successful and unsuccessful jumps, as the greater speed at takeoff (+0.15 m/s) was observed at successful jumps compared to unsuccessful jumps. Furthermore, female athletes showed a significant small difference in horizontal hand–foot distance between successful jumps and unsuccessful jumps (+0.05 m and +0.06 m at pole plant and take-off, respectively). The results suggest that pole vaulters should produce a fast run-up and avoid a decrease in speed before take-off. Small adjustments in the take-off posture might increase the transfer of energy from the athlete to the pole and thus an improvement concerning the height of bar clearance
Principles for integrating reactive species into in vivo biological processes:examples from exercise physiology
The equivocal role of reactive species and redox signaling in exercise responses and adaptations is an example clearly showing the inadequacy of current redox biology research to shed light on fundamental biological processes in vivo. Part of the answer probably relies on the extreme complexity of the in vivo redox biology and the limitations of the currently applied methodological and experimental tools. We propose six fundamental principles that should be considered in future studies to mechanistically link reactive species production to exercise responses or adaptations: 1) identify and quantify the reactive species, 2) determine the potential signaling properties of the reactive species, 3) detect the sources of reactive species, 4) locate the domain modified and verify the (ir)reversibility of post-translational modifications, 5) establish causality between redox and physiological measurements, 6) use selective and targeted antioxidants. Fulfilling these principles requires an idealized human experimental setting, which is certainly a utopia. Thus, researchers should choose to satisfy those principles, which, based on scientific evidence, are most critical for their specific research question
SISAR imaging - radio holography signal reconstruction based on receiver-transmitter motion
Radio Holography Signal (RHS) reconstruction is the primary method used for Shadow Inverse Synthetic Aperture Radar (SISAR) imaging algorithm application. In this paper an alternative way for RHS signal reconstruction is introduced based on the motion of receiver and/or transmitter ends. In particular, a novel model for time domain RHS signal is derived assuming a moving-ends (ME) scenario followed by the RHS reconstruction method. The model and reconstruction method area assessed through simulated data
Localization length in Dorokhov's microscopic model of multichannel wires
We derive exact quantum expressions for the localization length for
weak disorder in two- and three chain tight-binding systems coupled by random
nearest-neighbour interchain hopping terms and including random energies of the
atomic sites. These quasi-1D systems are the two- and three channel versions of
Dorokhov's model of localization in a wire of periodically arranged atomic
chains. We find that for the considered systems with
, where is Thouless' quantum expression for the inverse
localization length in a single 1D Anderson chain, for weak disorder. The
inverse localization length is defined from the exponential decay of the
two-probe Landauer conductance, which is determined from an earlier transfer
matrix solution of the Schr\"{o}dinger equation in a Bloch basis. Our exact
expressions above differ qualitatively from Dorokhov's localization length
identified as the length scaling parameter in his scaling description of the
distribution of the participation ratio. For N=3 we also discuss the case where
the coupled chains are arranged on a strip rather than periodically on a tube.
From the transfer matrix treatment we also obtain reflection coefficients
matrices which allow us to find mean free paths and to discuss their relation
to localization lengths in the two- and three channel systems
Conductance scaling at the band center of wide wires with pure non--diagonal disorder
Kubo formula is used to get the scaling behavior of the static conductance
distribution of wide wires showing pure non-diagonal disorder. Following recent
works that point to unusual phenomena in some circumstances, scaling at the
band center of wires of odd widths has been numerically investigated. While the
conductance mean shows a decrease that is only proportional to the inverse
square root of the wire length, the median of the distribution exponentially
decreases as a function of the square root of the length. Actually, the whole
distribution decays as the inverse square root of the length except close to
G=0 where the distribution accumulates the weight lost at larger conductances.
It accurately follows the theoretical prediction once the free parameter is
correctly fitted. Moreover, when the number of channels equals the wire length
but contacts are kept finite, the conductance distribution is still described
by the previous model. It is shown that the common origin of this behavior is a
simple Gaussian statistics followed by the logarithm of the E=0 wavefunction
weight ratio of a system showing chiral symmetry. A finite value of the
two-dimensional conductance mean is obtained in the infinite size limit. Both
conductance and the wavefunction statistics distributions are given in this
limit. This results are consistent with the 'critical' character of the E=0
wavefunction predicted in the literature.Comment: 10 pages, 9 figures, RevTeX macr
- …