Southern Federal Institute of Education and Technology

Pelotas, Brazil

Southern Federal Institute of Education and Technology

Pelotas, Brazil
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Araujo R.D.,Federal University of Uberlandia | Dorca F.A.,Federal University of Uberlandia | Ferreira H.N.M.,Southern Federal Institute of Education and Technology | Cattelan R.G.,Federal University of Uberlandia
International Conference on Intelligent User Interfaces, Proceedings IUI | Year: 2016

Learning objects authoring is still a complex and timeconsuming task for instructors, which requires attention to technical and pedagogical aspects. However, one can take advantage of the Ubiquitous Learning Environments characteristics to make it a mild process by means of automatic or semi-automatic processes. In this way, this paper presents an approach for creating learning objects and their metadata in such environments considering collaborative interactions among users. The proposed approach is being integrated to a real multimedia capture system used as a complementary tool in a university.

Ferreira H.N.M.,Southern Federal Institute of Education and Technology | Brant-Ribeiro T.,Southern Federal Institute of Education and Technology | Araujo R.D.,Federal University of Uberlandia | Dorca F.A.,Federal University of Uberlandia | Cattelan R.G.,Federal University of Uberlandia
Proceedings - 2016 IEEE 28th International Conference on Tools with Artificial Intelligence, ICTAI 2016 | Year: 2016

Dynamic adaptation of educational content has been an important research topic. Therefore, in order for it to run effectively, student models that properly describe and monitor the cognitive state of students are needed. In this sense, this paper presents a hybrid student model approach that combines ontologies and Bayesian Networks to identify the knowledge of each student based on their characteristics and behavior while using an Adaptive Educational System. Experiments were performed with real student participants in a higher education course using an experimental prototype developed to verify the viability of the approach, which showed satisfactory results. © 2016 IEEE.

Noskoski O.A.,Southern Federal Institute of Education and Technology | Bermudez J.C.M.,Federal University of Santa Catarina | De Almeida S.J.M.,Catholic University of Pelotas
IEEE Transactions on Signal Processing | Year: 2013

Identification of systems with sparse impulse response encounters large applicability. Numerous techniques have been proposed to identify such systems efficiently. One strategy that leads to specially good results is to detect the active (nonzero) response samples and update only the corresponding adaptive coefficients. Wavelet-based approaches have been shown to be specially effective to this end. This paper proposes a new region-based wavelet-packet (RBWP) algorithm for efficient identification of systems with sparse impulse responses with arbitrary frequency spectra and with any delay of the effective response. The discrete wavelet packet transform (DWPT) is adaptively tailored to the energy distribution of the unknown system's response spectrum. The new algorithm leads to a reduced number of active weights and to a reduced computational complexity, when compared with competing wavelet-based algorithms. Monte Carlo simulation results show good performances regarding convergence speed and robustness to design parameter choice. © 1991-2012 IEEE.

Wulf G.,University of Nevada, Las Vegas | Chiviacowsky S.,Southern Federal Institute of Education and Technology | Lewthwaite R.,University of Southern California
Research Quarterly for Exercise and Sport | Year: 2010

This study investigated the influence of normative feedback on learning a sequential timing task. In addition to feedback about their performance per trial, two groups of participants received bogus normative feedback about a peer group's average block-to-bbck improvement after each block of 10 trials. Scores indicated either greater (better group) or less (worse group) than the average improvement, respectively. On the transfer test 1 day later, which required producing novel absolute movement times, the better group demonstrated more effective learning than the worse group. These findings add to the mounting evidence that motivational factors affect motor skill learning. © 2010 by the American Alliance for Health, Physical Education. Recreation and Dance.

Salgado R.S.,Federal University of Santa Catarina | Barboza L.V.,Southern Federal Institute of Education and Technology
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2012

This paper presents a methodology to determine corrective adjustments in the demand when the power flow equations have no solution. This is formulated as a constrained optimization problem, which has the flexibility to select the buses that have load adjustment and those whose demand will be preserved. Useful information about the buses with major effects on the infeasibility of the power flow solutions is provided. A modified version of Newton's optimization method, which applies Gauss-Newton iterates and a step length control, is used to solve this optimization problem. The efficiency of the proposed strategy is assessed with power systems ranging from 14 to 1916 buses. © 2012 IEEE.

Cassana F.F.,Southern Federal Institute of Education and Technology | Eller C.B.,University of Campinas | Oliveira R.S.,University of Campinas | Dillenburg L.R.,Federal University of Rio Grande do Sul
Plant and Soil | Year: 2016

Background and aims: Foliar water uptake has been reported for different species, including conifers living in drought-prone environments. We conducted three experiments to determine whether leaves might absorb mist water and how this affects the water relations of well-watered and water-stressed young plants of Araucaria angustifolia. Methods: Three independent experiments were conducted using well-watered and water-stressed plants: immersion of shoot in water for the quantification of water uptake, the short-term exposure of plants to deuterium-enriched artificial mist, followed by the evaluation of plant water status and δ2H of xylem and soil water, and the use of the heat ratio method to measure the sap flow in saplings submitted to artificial mist. Results: Foliar water uptake was demonstrated in both groups of plants, but only water-stressed plants showed a significant improvement of shoot water status. Isotope analyses indicated release of mist water in water-stressed plants rhizosphere’s, and measurements of sap flow pointed to flow reversals in saplings exposed to mist, after a soil drought period. Conclusions: The results confirm the capacity of A. angustifolia for absorbing water deposited in its leaves and demonstrate that leaf-absorbed water can be transported through the xylem to the soil close to the roots and improve plant water status. © 2015, Springer International Publishing Switzerland.

Coelho L.D.S.,Pontifical Catholic University of Parana | Cunha M.A.B.,Southern Federal Institute of Education and Technology
Expert Systems with Applications | Year: 2011

This work presents an adaptive cascade controller tuned by using evolutionary algorithms for the trajectory tracking control of a hydraulic actuator with an overlapped proportional valve. The hydraulic actuator mathematical model includes the dead-zone nonlinearity due to the use of the overlapped valve. By considering the hydraulic actuator as a mechanical subsystem driven by a hydraulic one, a cascade strategy is proposed. Such cascade strategy is based on the order reduction and allows one to propose different control laws for each subsystem. Adaptive algorithms are used to compensate the parametric uncertainties in the hydraulic and mechanical subsystems including an adaptive compensation for the valve dead-zone. In the sequence, evolutionary algorithms are used to tune the proposed controller for performance optimization. Simulation results illustrate the main characteristics of the proposed controller and the performance of the evolutionary algorithm called differential evolution in tuning of proposed controller. © 2010 Elsevier Ltd. All rights reserved.

Martins A.,Southern Federal Institute of Education and Technology | Fonseca M.,Federal University of Pelotas | Fonseca M.,Catholic University of Pelotas | Costa E.,Catholic University of Pelotas
Proceedings of the IEEE International Conference on Electronics, Circuits, and Systems | Year: 2016

In this paper, we seek the optimal combination of dedicated radix-2m multiplication blocks, and adder trees schemes for the realization of optimized radix-2m array multipliers. The operands of the multipliers are generated by 2's complement radix-4, radix-16, radix-256, and radix-65536 dedicated multiplication blocks. The operands are added using different adder trees schemes such as Wallace, RBA, and compressors. The number of operands defines the amount of adders blocks used in the addition tree of the array multiplier. The logic synthesis was realized using Cadence Encounter RTL Compiler tool with Nangate 45nm Open Cell library. Area, delay and power consumption results are presented for the synthesized proposed multipliers. As will be presented, the combination of radix-4 or radix-16 dedicated multiplication block and multi-operand adder tree schemes yields the best power - performance results in the radix-2" array multipliers. © 2015 IEEE.

Fischer S.Z.,Southern Federal Institute of Education and Technology | Stumpf E.R.T.,Southern Federal Institute of Education and Technology | Mariot M.P.,Southern Federal Institute of Education and Technology
Acta Horticulturae | Year: 2015

Maytenus ilicifolia (Schrad.) Planch is a native plant of south Brazil and is popularly used medicinally for stomach diseases. This plant could also have ornamental purposes. This paper describes this plant for ornamental uses. It is classified as a small tree or as a big bush with maximum 5 m height. It has a dense symmetrical canopy of glossy, dark green, leathery leaves, with thorny margins and cream colored edging. Small cream colored flowers develop in early spring followed by small oblong, red fruits that open exposing the white aril, forming a beautiful contrast. It has potential very similar to Ilex aquifolium which is used in Christmas festivities in the northern hemisphere. The stems have high potential to be used in the cut flower sector with durability of more than 10 days in water as a cut floral product. In landscaping it can be used as a feature plant or a hedgerow and because of its compact size. Another possibility is also in usage as a bonsai subject.

De Oliveira Cacho R.,Federal University of Rio Grande do Norte | Cacho E.W.A.,Federal University of Rio Grande do Norte | Ortolan R.L.,Southern Federal Institute of Education and Technology | Cliquet A.,University of Campinas | Borges G.,University of Campinas
Medicine (United States) | Year: 2015

The objective of this study was to evaluate the long-term effects of the task-specific training with trunk restraint compared with the free one in poststroke reaching movements. The design was randomized trial. The setting was University of Campinas (Unicamp). Twenty hemiparetic chronic stroke patients were selected and randomized into 2 training groups: trunk restraint group (TRG) (reaching training with trunk restraint) and trunk free group (TFG) (unrestraint reaching). Twenty sessions with 45 minutes of training were accomplished. The patients were evaluated in pretreatment (PRE), posttreatment (POST) and 3 months after the completed training (RET) (follow-up). Main outcome measures were modified Ashworth scale, Barthel index, Fugl-Meyer scale, and kinematic analysis (movement trajectory, velocity, angles). A significant improvement, which maintained in the RET test, was found in the motor (P<0.001) and functional (P=0.001) clinical assessments for both groups. For trunk displacement, only TFG obtained a reduction statistical significance from PRE to the POST test (P=0.002), supporting this result in the RET test. Despite both groups presenting a significant increase in the shoulder horizontal adduction (P=0.003), only TRG showed a significant improvement in the shoulder (P=0.001 - PRE to POST and RET) and elbow (P=0.038 - PRE to RET) flexion extension, and in the velocity rate (P=0.03 - PRE to RET). The trunk restraint therapy showed to be a long-term effective treatment in the enhancement of shoulder and elbow active joint range and velocity rate but not in the maintenance of trunk retention. © 2015 Wolters Kluwer Health, Inc.

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