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Primo T.T.,Samsung | Behr A.,Institute Informatica | Viccari R.,Institute Informatica
Communications in Computer and Information Science | Year: 2016

This research presents a method to describe Learning Objects as Semantic Web compatible Ontologies. The proposed method divides the Ontologies among three layers. The first is composed by the knowledge domain, the second by the LOs and their relations, and the third is responsible for knowledge inference and reasoning. As study case, it is presented the Ontologies of LOM and OBAA metadata standards as part of the Layer One. The layer two is composed by the description of sample Learning Objects based on the properties and restrictions defines by the layer one ontologies. The layer three describes the knowledge inference axioms, which we defined as Application Profiles. Our current results can be resumed as a contribution to Ontology Engineering for Semantic Web applied to Digital Education. © Springer International Publishing AG 2016.


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.


Entrena L.,Charles III University of Madrid | Lindoso A.,Charles III University of Madrid | Millan E.S.,Charles III University of Madrid | Pagliarini S.,Institute Informatica | And 2 more authors.
IEEE Transactions on Nuclear Science | Year: 2012

This paper presents a methodology to reduce the impact of double faults in a circuit by constraining the placement of its standard cells. A fault-injection emulation platform is used to analyze the single-event-induced charge sharing effect in every pair of nodes. Based on the sensitivity of each pair, guidelines are set in a commercial standard cell placement by using constraints. Results show that by correctly choosing the nodes location, the error rate resulting from double faults can be reduced compared to single fault. © 2012 IEEE.


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.


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


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.


Santos E.T.,Institute Informatica | Zarate L.E.,Institute Informatica | Pereira E.M.D.,Institute Informatica
Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics | Year: 2010

In this paper, a hybrid structure is proposed to simulate thermal behaviors of pools. The structure uses several neural models to represent the climatic data and a parametric estimation algorithm to determine the variation in volume due to the human activity. The new structure allows adapting the thermal dynamic model for pools, considering variations over time for different regional weather conditions. As a case study, the region of the state of Minas Gerais (MG) - Brazil was considered. ©2010 IEEE.


Schneider R.G.,Institute Informatica | Oliveira M.M.,Institute Informatica
SIGGRAPH Asia 2014 Technical Briefs, SA 2014 | Year: 2014

We introduce a new interface for augmenting e-learning videos with panoramic frames and content-based navigation. Our interface gradually builds a panoramic video, and allows users to navigate through such video by directly clicking on its contents, as opposed to using a conventional time slider. We demonstrate the effectiveness of our approach by successfully applying it to three representative styles of e-learning videos: Khan Academy, Coursera, and conventional lecture recorded with a camera. The techniques described provide more efficient ways for exploring the benefits of e-learning videos. As such, they have the potential to impact education by providing more customizable learning experiences for millions of e-learners around the world.


Tonfat J.,Institute Informatica | Kastensmidt F.,Institute Informatica | Reis R.,Institute Informatica
2015 NASA/ESA Conference on Adaptive Hardware and Systems, AHS 2015 | Year: 2015

Reliability is a major design constraint for critical applications. SRAM-based FPGAs are attractive to critical applications due to their high performance and flexibility. However, they are high susceptible to radiation effects such as soft errors. Memory scrubbing is an effective method to correct soft errors in SRAM memories but it imposes an overhead in terms of logic area and energy consumption. This work proposes a novel scrubbing technique using internal frame redundancy called Frame-level Redundancy Scrubbing (FLR-scrubbing) with minimum energy consumption overhead without compromising the correction capabilities. As a case study, the FLR-scrubbing controller was implemented on a mid-size Xilinx Virtex-5 FPGA device, occupying 8% of available slices and consumes six times less energy per scrubbed frame than a classic blind scrubber. © 2015 IEEE.


Wilke G.,Institute Informatica | Reis R.,Institute Informatica
LATW2010 - 11th Latin-American Test Workshop | Year: 2010

Dealing with process and environmental variability became a great challenge for IC designers in the latest technology nodes. Digital circuits are designed in such a way that timing and power constraints are respected with minimum resource usage, to do that tight power and timing margins are desired. If process and environmental variability are not accounted during the design stage power and timing margins may not be sufficient to accommodate variability effect. To guarantee robust operation physical design algorithms must account for the variability effect. This presentation gives an overview of some of the available techniques for designing variation tolerant circuits. Techniques for robust clock distribution and routing will be approached. ©2010 IEEE.

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