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Albacete, Spain

Aciar S.,Institute Informatica
Proceedings of Special Session 2014 13th Mexican International Conference on Artificial Intelligence: Advances in Artificial Intelligence, MICAI 2014 | Year: 2014

Ask friends about a particular subject are a common situation in the daily life of a person. In virtual environments is a little more difficult. Virtual environments do not always allow face contact that helps people meet and share their experiences to answer questions about a particular subject. In this article are presented: a text mining method for obtaining the knowledge of people from forums and a recommender system that recommends people to ask them about a particular subject. © 2014 IEEE. Source

Henz B.,Institute Informatica | Oliveira M.M.,Institute Informatica
Visual Computer | Year: 2015

We present a practical solution to the problem of subject relighting in paintings and drawings. Our interactive technique uses 3-D shading proxies and can be applied to objects with arbitrary geometries. Given a user-provided guess for the shading of an object in a painting/drawing and its corresponding target shading, we refine them using shading-color correlation and a multi-scale scheme. These refined shadings are then used to create a multi-channel shading-ratio image to perform relighting, while taking into account the colors used by the artists to convey shading information. We demonstrate the effectiveness of our solution on a variety of artistic styles, including paintings with strong brush strokes and unconventional shading encodings, drawings, and other types of artwork. Our method is the first to perform relighting of paintings and drawings and, in addition to relighting, can transfer smooth normal and depth maps from 3-D proxies to images. © 2015 Springer-Verlag Berlin Heidelberg Source

Soler J.M.,Institute Informatica | Cuartero F.,Institute Informatica | Roblizo M.,University of Castilla - La Mancha
Proceedings of the 2012 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, ASONAM 2012 | Year: 2012

The use of social networking sites, such as Twitter, for various purposes, continues to grown since its first appearance. This social net is a microblogging site to share short messages on a variety of topics. In particular, political elections are a very interesting field to exchange views using this platform. In this paper we have used Spanish elections to investigate the use of Twitter for this purpose, and to find out if the conversations maintained there can anticipate, in some way, the results of the elections. In order to do this, we have developed a tool, called Taratweet, to define experiments and to capture the defined conversations, and have applied it to the cases of three Spanish elections during 2011 and 2012. Our results show that Twitter is used for political discussion, and that the references to the different political parties correlate, significatively, with the votes of the electors. This is an indicator that Twitter may be used by social researchers as a tool, among others, to predict future results of the elections. Of course, with due caution because the measured data correspond to distinct actions, so obviously, much more research and studies should be done in this field. © 2012 IEEE. Source

Rech P.,Institute Informatica | Frost C.,Rutherford Appleton Laboratory | Carro L.,Federal University of Rio Grande do Sul
Journal of Electronic Testing: Theory and Applications (JETTA) | Year: 2014

Graphics Processing Units are very prone to be corrupted by neutrons. Experimental results obtained irradiating the GPU with high energy neutrons show that the input data type has a strong influence on the neutron-induced error-rate of the executed algorithms. Moreover, when operations are performed using floating-point data, the probabilities to be corrupted are very different for the mantissa, the exponent or the sign. We investigate the occurrences of errors in the different positions, evaluating the related effects on the result precision. The reported results and the architecture analysis demonstrate that under radiation, whenever possible, one should favor floating-point arithmetic, which is both more reliable and potentially easier to protect than the integer one. © 2014 Springer Science+Business Media New York. Source

Pagliarini S.,Institute Informatica | Kastensmidt F.,Institute Informatica | Entrena L.,Charles III University of Madrid | Lindoso A.,Charles III University of Madrid | Millan E.S.,Charles III University of Madrid
IEEE Transactions on Nuclear Science | Year: 2011

This paper proposes a soft error characterization methodology to analyze multiple faults caused by single-event-induced charge sharing in standard-cell based ASIC designs. Fault injection campaigns have been executed using data provided by placement analysis as well as a pulse width modeling through electrical simulation. Experimental results demonstrate that the error rate can be largely overestimated if placement is not considered. © 2011 IEEE. Source

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