3,290 research outputs found
Heuristic Voting as Ordinal Dominance Strategies
Decision making under uncertainty is a key component of many AI settings, and
in particular of voting scenarios where strategic agents are trying to reach a
joint decision. The common approach to handle uncertainty is by maximizing
expected utility, which requires a cardinal utility function as well as
detailed probabilistic information. However, often such probabilities are not
easy to estimate or apply.
To this end, we present a framework that allows "shades of gray" of
likelihood without probabilities. Specifically, we create a hierarchy of sets
of world states based on a prospective poll, with inner sets contain more
likely outcomes. This hierarchy of likelihoods allows us to define what we term
ordinally-dominated strategies. We use this approach to justify various known
voting heuristics as bounded-rational strategies.Comment: This is the full version of paper #6080 accepted to AAAI'1
Hypergraph Neural Networks through the Lens of Message Passing: A Common Perspective to Homophily and Architecture Design
Most of the current hypergraph learning methodologies and benchmarking
datasets in the hypergraph realm are obtained by lifting procedures from their
graph analogs, leading to overshadowing specific characteristics of
hypergraphs. This paper attempts to confront some pending questions in that
regard: Q1 Can the concept of homophily play a crucial role in Hypergraph
Neural Networks (HNNs)? Q2 Is there room for improving current HNN
architectures by carefully addressing specific characteristics of higher-order
networks? Q3 Do existing datasets provide a meaningful benchmark for HNNs? To
address them, we first introduce a novel conceptualization of homophily in
higher-order networks based on a Message Passing (MP) scheme, unifying both the
analytical examination and the modeling of higher-order networks. Further, we
investigate some natural, yet mostly unexplored, strategies for processing
higher-order structures within HNNs such as keeping hyperedge-dependent node
representations, or performing node/hyperedge stochastic samplings, leading us
to the most general MP formulation up to date -MultiSet-, as well as to an
original architecture design, MultiSetMixer. Finally, we conduct an extensive
set of experiments that contextualize our proposals and successfully provide
insights about our inquiries
Training improves visual processing speed and generalizes to untrained functions
Studies show that manipulating certain training features in perceptual
learning determines the specificity of the improvement. The improvement in
abnormal visual processing following training and its generalization to visual
acuity, as measured on static clinical charts, can be explained by improved
sensitivity or processing speed. Crowding, the inability to recognize objects
in a clutter, fundamentally limits conscious visual perception. Although it
was largely considered absent in the fovea, earlier studies report foveal
crowding upon very brief exposures or following spatial manipulations. Here we
used GlassesOff's application for iDevices to train foveal vision of young
participants. The training was performed at reading distance based on contrast
detection tasks under different spatial and temporal constraints using Gabor
patches aimed at testing improvement of processing speed. We found several
significant improvements in spatio-temporal visual functions including near
and also non-trained far distances. A remarkable transfer to visual acuity
measured under crowded conditions resulted in reduced processing time of 81
ms, in order to achieve 6/6 acuity. Despite a subtle change in contrast
sensitivity, a robust increase in processing speed was found. Thus, enhanced
processing speed may lead to overcoming foveal crowding and might be the
enabling factor for generalization to other visual functions
Modelling facilitated transport in Polyvinyl amine membranes for CO2 capture: insights from Molecular Dynamics and PC-SAFT EoS.
In the context of CO2 removal from gas streams, the project NANOMEMC2 (www.nanomemc2.eu) focuses on Facilitated Transport (FT) membranes based on Polyvinyl mine (PVAm). Such materials bear amine groups that, in presence of humidity, promote reactions that boost the transport of CO2 while not affecting the other gases. A possible reaction route is shown in Figure 1. Very few modelling studies are present in the literature concerning these fixed sites FT membranes despite their selectivity comparable to the most common absorption processes. Aim of the present work is to provide a detailad deep investigation on the transport properties of PVAm, to partially fill this lack, for the ternary system of CO2/H2O/PVAm. Molecular Dynamics (MD) and PC-SAFT1 Equation of State (EoS) were used to achieve a reliable interpretation of the physical sorption process of CO2 in such a complex, strongly polar environment
Modelling facilitated transport in Polyvinyl amine membranes for CO2 capture: insights from Molecular Dynamics and PC-SAFT EoS.
The removal of CO2 from flue gas in power plants or energy-intensive industries is one of the main ways to reduce the increasing CO2 atmospheric levels, that cause global warming. Among the various technologies identified for this aim, such as solvent absorption and adsorption, membrane separation is considered as the most flexible and environmentally friendly option. For this reason the project NANOMEMC2 (www.nanomemc2.eu) aims at developing innovative membranes with improved CO2 capture ability, which can make the capture less costly. The project focuses on Facilitated Transport (FT) membranes, that are
endowed with higher selectivity values with respect to conventional ones. Such materials bear amine groups that, in presence of humidity, promote reactions that boost the transport of CO2 while not affecting the other gases
Modelling facilitated transport in Polyvinyl amine membranes for CO2 capture: insights from Molecular Dynamics and PC-SAFT EoS.
In the context of CO2 removal from gas streams, the project NANOMEMC2 (www.nanomemc2.eu) focuses on Facilitated Transport (FT) membranes based on Polyvinyl mine (PVAm). Such materials bear amine groups that, in presence of humidity, promote reactions that boost the transport of CO2 while not affecting the other gases. A possible reaction route is shown in Figure 1. Very few modelling studies are present in the literature concerning these fixed sites FT membranes despite their selectivity comparable to the most common absorption processes. Aim of the present work is to provide a detailad deep investigation on the transport properties of PVAm, to partially fill this lack, for the ternary system of CO2/H2O/PVAm. Molecular Dynamics (MD) and PC-SAFT1 Equation of State (EoS) were used to achieve a reliable interpretation of the physical sorption process of CO2 in such a complex, strongly polar environment
- …