3,166 research outputs found
A computational approach to the covert and overt deployment of spatial attention
Popular computational models of visual attention tend to neglect the
influence of saccadic eye movements whereas it has been shown that the primates
perform on average three of them per seconds and that the neural substrate for
the deployment of attention and the execution of an eye movement might
considerably overlap. Here we propose a computational model in which the
deployment of attention with or without a subsequent eye movement emerges from
local, distributed and numerical computations
Global hypoelliptic and symbolic estimates for the linearized Boltzmann operator without angular cutoff
In this article we provide global subelliptic estimates for the linearized
inhomogeneous Boltzmann equation without angular cutoff, and show that some
global gain in the spatial direction is available although the corresponding
operator is not elliptic in this direction. The proof is based on a multiplier
method and the so-called Wick quantization, together with a careful analysis of
the symbolic properties of the Weyl symbol of the Boltzmann collision operator
Fast computation of power series solutions of systems of differential equations
We propose new algorithms for the computation of the first N terms of a
vector (resp. a basis) of power series solutions of a linear system of
differential equations at an ordinary point, using a number of arithmetic
operations which is quasi-linear with respect to N. Similar results are also
given in the non-linear case. This extends previous results obtained by Brent
and Kung for scalar differential equations of order one and two
Microfluidic multipoles: theory and applications
Microfluidic multipoles (MFMs) have been realized experimentally and hold
promise for "open-space" biological and chemical surface processing. Whereas
convective flow can readily be predicted using hydraulic-electrical analogies,
the design of advanced MFMs is constrained by the lack of simple, accurate
models to predict mass transport within them. In this work, we introduce the
first exact solutions to mass transport in multipolar microfluidics based on
the iterative conformal mapping of 2D advection-diffusion around a simple edge
into dipoles and multipolar geometries, revealing a rich landscape of transport
modes. The models were validated experimentally with a library of 3D printed
MFM devices and found in excellent agreement. Following a theory-guided design
approach, we further ideated and fabricated two new classes of spatiotemporally
reconfigurable MFM devices that are used for processing surfaces with
time-varying reagent streams, and to realize a multistep automated immunoassay.
Overall, the results set the foundations for exploring, developing, and
applying open-space MFMs.Comment: 16 pages, 5 figure
Real scenario and simulations on GLOSA traffic light system for reduced CO2 emissions, waiting time and travel time
Cooperative ITS is enabling vehicles to communicate with the infrastructure
to provide improvements in traffic control. A promising approach consists in
anticipating the road profile and the upcoming dynamic events like traffic
lights. This topic has been addressed in the French public project Co-Drive
through functions developed by Valeo named Green Light Optimal Speed Advisor
(GLOSA). The system advises the optimal speed to pass the next traffic light
without stopping. This paper presents results of its performance in different
scenarios through simulations and real driving measurements. A scaling is done
in an urban area, with different penetration rates in vehicle and
infrastructure equipment for vehicular communication. Our simulation results
indicate that GLOSA can reduce CO2 emissions, waiting time and travel time,
both in experimental conditions and in real traffic conditions.Comment: in 22nd ITS World Congress, Oct 2015, Bordeaux, France. 201
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