2,834 research outputs found
Single-Trial Recognition of Video Gamerâs Expertise from Brain Haemodynamic and Facial Emotion Responses
With an increase in consumer demand of video gaming entertainment, the game industry
is exploring novel ways of game interaction such as providing direct interfaces between the game
and the gamersâ cognitive or affective responses. In this work, gamerâs brain activity has been
imaged using functional near infrared spectroscopy (fNIRS) whilst they watch video of a video
game (League of Legends) they play. A video of the face of the participants is also recorded for
each of a total of 15 trials where a trial is defined as watching a gameplay video. From the data
collected, i.e., gamerâs fNIRS data in combination with emotional state estimation from gamerâs
facial expressions, the expertise level of the gamers has been decoded per trial in a multi-modal
framework comprising of unsupervised deep feature learning and classification by state-of-the-art
models. The best tri-class classification accuracy is obtained using a cascade of random convolutional
kernel transform (ROCKET) feature extraction method and deep classifier at 91.44%. This is the first
work that aims at decoding expertise level of gamers using non-restrictive and portable technologies
for brain imaging, and emotional state recognition derived from gamersâ facial expressions. This work
has profound implications for novel designs of future human interactions with video games and
brain-controlled games
Diversification and manager autonomy in fund families: Implications for investors
This paper aims to investigate the consequences of investing in a single fund family for investors. In essence, we focus on the correlation among portfolio holdings of funds with effects in terms of under-diversification for mutual fund investors, especially, if they invest in the same fund family. We also explore the fund manager autonomy in portfolio holding allocation within families and determine the characteristics of those fund families with higher autonomy. Our results show that a higher correlation among funds not only implies that families offer a lower diversification to investors; it also has a negative effect on their performance. However, investorsâ performance benefits from a higher manager autonomy. Consequently, investors who select a single fund family could obtain higher returns in smaller fund families with considerable experience that do not belong to a banking or insurance group, as in the former, diversification and manager autonomy are higher
Asterias: a parallelized web-based suite for the analysis of expression and aCGH data
Asterias (\url{http://www.asterias.info}) is an integrated collection of
freely-accessible web tools for the analysis of gene expression and aCGH data.
Most of the tools use parallel computing (via MPI). Most of our applications
allow the user to obtain additional information for user-selected genes by
using clickable links in tables and/or figures. Our tools include:
normalization of expression and aCGH data; converting between different types
of gene/clone and protein identifiers; filtering and imputation; finding
differentially expressed genes related to patient class and survival data;
searching for models of class prediction; using random forests to search for
minimal models for class prediction or for large subsets of genes with
predictive capacity; searching for molecular signatures and predictive genes
with survival data; detecting regions of genomic DNA gain or loss. The
capability to send results between different applications, access to additional
functional information, and parallelized computation make our suite unique and
exploit features only available to web-based applications.Comment: web based application; 3 figure
Multivariate synthetic streamflow generation using a hybrid model based on artificial neural networks
International audienceA model for multivariate streamflow generation is presented, based on a multilayer feedforward neural network. The structure of the model results from two components, the neural network (NN) deterministic component and a random component which is assumed to be normally distributed. It is from this second component that the model achieves the ability to incorporate effectively the uncertainty associated with hydrological processes, making it valuable as a practical tool for synthetic generation of streamflow series. The NN topology and the corresponding analytical explicit formulation of the model are described in detail. The model is calibrated with a series of monthly inflows to two reservoir sites located in the Tagus River basin (Spain), while validation is performed through estimation of a set of statistics that is relevant for water resources systems planning and management. Among others, drought and storage statistics are computed and compared for both the synthetic and historical series. The performance of the NN-based model was compared to that of a standard autoregressive AR(2) model. Results show that NN represents a promising modelling alternative for simulation purposes, with interesting potential in the context of water resources systems management and optimisation. Keywords: neural networks, perceptron multilayer, error backpropagation, hydrological scenario generation, multivariate time-series.
RecuperaciĂłn e identificaciĂłn de variedades de vid en AragĂłn
1 copia .pdf del Póster original de los Autores.- 1 Tabl.- 4 Fots. Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)A partir de la década de los setenta diferentes circunstancias provocaron que muchas de las zonas mås productivas arrancaran las vides antiguas y apostaran por plantaciones de variedades foråneas o distintas de las tradicionales.
Conscientes de la pĂ©rdida de biodiversidad, desde la Unidad de TecnologĂa Vegetal (Gobierno de AragĂłn) se viene prospectando en toda la geografĂa aragonesa y recopilando accesiones de vid, especialmente en viñas antiguas y a punto de desaparecer. El año 1992 se formĂł el Banco de Germoplasma de Vid de AragĂłn (Dep. de Agricultura, GanaderĂa y Medio Ambiente) que conserva mĂĄs de 700 accesiones (algunas caracterizadas molecularmente, Buhner-Zaharieva et al., 2010) .Este trabajo ha sido financiado por el INIA (RF2012-00027-C05-02) y el Gobierno de AragĂłn (A44)Peer reviewe
The Effects of the Peak-Peak Correlation on the Peak Model of Hierarchical Clustering
In two previous papers a semi-analytical model was presented for the
hierarchical clustering of halos via gravitational instability from peaks in a
random Gaussian field of density fluctuations. This model is better founded
than the extended Press-Schechter model, which is known to agree with numerical
simulations and to make similar predictions. The specific merger rate, however,
shows a significant departure at intermediate captured masses. The origin of
this was suspected as being the rather crude approximation used for the density
of nested peaks. Here, we seek to verify this suspicion by implementing a more
accurate expression for the latter quantity which accounts for the correlation
among peaks. We confirm that the inclusion of the peak-peak correlation
improves the specific merger rate, while the good behavior of the remaining
quantities is preserved.Comment: ApJ accepted. 15 pages, including 4 figures. Also available at
ftp://pcess1.am.ub.es/pub/ApJ/effectpp.ps.g
HSV-1 and endogenous retroviruses as risk factors in demyelination
Herpes simplex virus type 1 (HSV-1) is a neurotropic alphaherpesvirus that can infect the peripheral and central nervous systems, and it has been implicated in demyelinating and neurodegenerative processes. Transposable elements (TEs) are DNA sequences that can move from one genomic location to another. TEs have been linked to several diseases affecting the central nervous system (CNS), including multiple sclerosis (MS), a demyelinating disease of unknown etiology influenced by genetic and environmental factors. Exogenous viral transactivators may activate certain retrotransposons or class I TEs. In this context, several herpesviruses have been linked to MS, and one of them, HSV-1, might act as a risk factor by mediating processes such as molecular mimicry, remyelination, and activity of endogenous retroviruses (ERVs). Several herpesviruses have been involved in the regulation of human ERVs (HERVs), and HSV-1 in particular can modulate HERVs in cells involved in MS pathogenesis. This review exposes current knowledge about the relationship between HSV-1 and human ERVs, focusing on their contribution as a risk factor for MS
Neutron star interiors and the equation of state of ultra-dense matter
There has been much recent progress in our understanding of quark matter,
culminating in the discovery that if such matter exists in the cores of neutron
stars it ought to be in a color superconducting state. This paper explores the
impact of superconducting quark matter on the properties (e.g., masses, radii,
surface gravity, photon emission) of compact stars.Comment: 3 pages, 4 figures; Paper presented at the Int. Conf. on Quark
Confinement and the Hadron Spectrum VII, Ponta Delgada, Acores, 2-7 September
2006; to be published by AI
Review of the early Albian ammonites of the Montmell Formation near Marmellar (Salou-Garraf Basin, Tarragona, Catalonia, Spain)
In this work, we review the ammonites of the Montmell Formation in the Marmellar area housed in the collections of the Museo GeolĂłgico del Seminario de Barcelona and the Museu de Geologia de Barcelona. This taxonomic update allows the proper biostratigraphic analysis of the ammonite assemblage and assigns it to the early Albian, Leymeriella tardefurcata Zone. The taxonomic analysis of all the studied material allows us to recognize the presence of the following taxa: Uhligella sp., Parengonoceras bassei, Hypacanthoplites plesiotypicus, Hypacanthoplites milletianus, Hypacanthoplites subelegans, and Hypacanthoplites sp. The current work is a step forward in the chronostratigraphic knowledge of the Salou-Garraf Basin in the Catalan Coastal Ranges
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