211 research outputs found
Aggregating opinions in non-uniform ordered qualitative scales
Producción CientíficaThis paper introduces a new voting system in the setting of ordered qualitative scales. The process is conducted in a purely ordinal way by considering an ordinal proximity measure that assigns an ordinal degree of proximity to each pair of linguistic terms of the qualitative scale. Once the agents assess the alternatives through the qualitative scale, the alternatives are ranked according to the medians of the ordinal degrees of proximity between the obtained individual assessments and the highest linguistic term of the scale. Since some alternatives may share the same median, an appropriate tie-breaking procedure is introduced. Some properties of the proposed voting system have been provided.Ministerio de Economía, Industria y Competitividad (Project ECO2016-77900-P
Ordinal proximity measures in the context of unbalanced qualitativescales and some applications to consensus and clustering
Producción CientíficaIn this paper, we introduce ordinal proximity measures in the setting of unbalanced qualitative scales by comparing the proximities between linguistic terms without numbers, in a purely ordinal approach. With this new tool, we propose how to measure the consensus in a set of agents when they assess a set of alternatives through an unbalanced qualitative scale. We also introduce an agglomerative hierarchical clustering procedure based on these consensus measures.Ministerio de Economía, Industria y Competitividad (ECO2012-32178)Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA066U13
A consensus reaching process in the context of non-uniform ordered qualitative scales
Producción CientíficaIn this paper, we consider that a group of agents judge a set of alternatives by
means of an ordered qualitative scale. The scale is not assumed to be uniform,
i.e., the psychological distance between adjacent linguistic terms is not necessarily
always the same. In this setting, we propose how to measure the consensus in
each subset of at least two agents over each subset of alternatives. We introduce
a consensus reaching process where some agents may be invited to change their
assessments over some alternatives in order to increase the consensus. All the
steps are managed in a purely ordinal way through ordinal proximity measures.Ministerio de Economía, Industria y Competitividad (ECO2012-32178)Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA066U13
Consensus-based clustering under hesitant qualitative assessments
Producción CientíficaIn this paper, we consider that agents judge the feasible alternatives through linguistic terms – when they are confident in their opinions – or linguistic expressions formed by several consecutive linguistic terms – when they hesitate. In this context, we propose an agglomerative hierarchical clustering process where the clusters of agents are generated by using a distance-based consensus measure.Ministerio de Economía, Industria y Competitividad (ECO2012-32178)Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA066U13
Medidas de consenso en contextos preferenciales generadas por distancias
En esta tesis se ha analizado cómo medir el consenso entre agentes que muestran sus preferencias sobre alternativas en diversos escenarios. El concepto de medida de consenso, introducido por Bosch para órdenes lineales, se ha extendido a órdenes débiles, órdenes dicotómicos y preferencias aprobatorias. Se han propuesto varias clases de medidas de consenso que tienen en cuenta las distancias entre las preferencias individuales; además, se ha desarrollado un procedimiento para que las distancias entre preferencias sean generadas por distancias entre vectores. Se han introducido distancias ponderadas sobre órdenes débiles, órdenes dicotómicos y preferencias aprobatorias que son sensibles a dónde se producen desacuerdos en la ordenación de las alternativas. Se ha llevado a cabo un estudio de las propiedades de las correspondientes medidas de consenso en los escenarios mencionados. Por otra parte se han utilizado medidas de consenso para la creación de conglomerados mediante un nuevo criterio, denominado método del consensoDepartamento de Economía Aplicad
Energetics and dynamics of H adsorbed in a nanoporous material at low temperature
Molecular hydrogen adsorption in a nanoporous metal organic framework
structure (MOF-74) was studied via van der Waals density-functional
calculations. The primary and secondary binding sites for H were confirmed.
The low-lying rotational and translational energy levels were calculated, based
on the orientation and position dependent potential energy surface at the two
binding sites. A consistent picture is obtained between the calculated
rotational-translational transitions for different H loadings and those
measured by inelastic neutron scattering exciting the singlet to triplet (para
to ortho) transition in H. The H binding energy after zero point energy
correction due to the rotational and translational motions is predicted to be
100 meV in good agreement with the experimental value of 90 meV.Comment: 5 pagers, 4 figures. added reference
Metrizable ordinal proximity measures and their aggregation
Producción CientíficaOrdered qualitative scales formed by linguistic terms are frequently used for evaluating sets of alternatives in different decision-making problems. These scales are usually implicitly considered as uniform in the sense that the psychological proximity between consecutive terms is perceived as identical. However, sometimes agents can perceive different proximities between the linguistic terms of the scale, and an appropriate method is required for aggregating these perceptions. In this paper we introduce the notion of metrizable ordinal proximity measure, discuss some aggregation procedures and propose a method based on metrics for aggregating experts’ opinions on proximities between linguistic terms on ordered qualitative scales.Ministerio de Economía, Industria y Competitividad (Project ECO2016-77900-P
Measuring consensus in a preference-approval context
Producción CientíficaWe consider measuring the degree of homogeneity for preference-approval proles which include the approval information for the alternatives as well as the rankings of them. A distance-based approach is followed to measure the disagreement for any given two preference-approvals. Under the condition that a proper metric is used, we propose a measure of consensus which is robust to some extensions of the ordinal framework. This paper also shows that there exists a limit for increasing the homogeneity level in a group of individuals by simply replicating their preference approvals.Ministerio de Economía, Industria y Competitividad (ECO2009- 07332)Ministerio de Economía, Industria y Competitividad (ECO2008-03204-E/ECON
Robot móvil controlado por ROS
En este proyecto se ha realizado un acercamiento así como un análisis de la herramienta ROS, usada en el desarrollo de software para robots móviles, pasando por la historia de la herramienta, su estado actual en la industria, su uso e implementación. No obstante, pese a que el proyecto está centrado en ROS, también se exploran temas relacionados con el robot móvil a controlar, tales como sus componentes electrónicos, diseño del chasis, autonomía, sensores y, tanto diseños eléctrico como electrónico.<br /
Prediction error signaling explains neuronal mismatch responses in the medial prefrontal cortex
The mismatch negativity (MMN) is a key biomarker of automatic deviance detection thought
to emerge from 2 cortical sources. First, the auditory cortex (AC) encodes spectral regularities and reports frequency-specific deviances. Then, more abstract representations in the
prefrontal cortex (PFC) allow to detect contextual changes of potential behavioral relevance.
However, the precise location and time asynchronies between neuronal correlates underlying this frontotemporal network remain unclear and elusive. Our study presented auditory
oddball paradigms along with “no-repetition” controls to record mismatch responses in neuronal spiking activity and local field potentials at the rat medial PFC. Whereas mismatch
responses in the auditory system are mainly induced by stimulus-dependent effects, we
found that auditory responsiveness in the PFC was driven by unpredictability, yielding context-dependent, comparatively delayed, more robust and longer-lasting mismatch
responses mostly comprised of prediction error signaling activity. This characteristically different composition discarded that mismatch responses in the PFC could be simply inherited
or amplified downstream from the auditory system. Conversely, it is more plausible for the
PFC to exert top-down influences on the AC, since the PFC exhibited flexible and potent
predictive processing, capable of suppressing redundant input more efficiently than the AC.
Remarkably, the time course of the mismatch responses we observed in the spiking activity
and local field potentials of the AC and the PFC combined coincided with the time course of
the large-scale MMN-like signals reported in the rat brain, thereby linking the microscopic,
mesoscopic, and macroscopic levels of automatic deviance detectio
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