Buenos Aires, Argentina
Buenos Aires, Argentina

The Buenos Aires Institute of Technology, is an Argentine private university located in the city of Buenos Aires. Its focus is primarily on Information Technology, Business and Engineering studies.In spite of being a small university, with only about 1650 undergraduate students, ITBA is regarded as one of the best engineering schools in Latin America, with an annual graduation average of 200 engineers, about 10% of the annual national total. ITBA maintains cooperation agreements with over 50 universities in 20 countries. Wikipedia.

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Bianchi F.D.,Catalonia Institute for Energy Research IREC | Sanchez-Pena R.S.,Buenos Aires Institute of Technology | Guadayol M.,Alstom
Renewable Energy | Year: 2012

A new design methodology of gain scheduled controllers for wind turbines is presented. The proposed methodology is intended to deal with multi-variable and high order models as those produced by high fidelity aeroelastic simulators. The methodology consists in interpolating the local controller outputs and does not require a uniform state definition either of the local controllers or of the linear models. This allows the design of each controller independently, an essential point in cases of high order models. An aeroelastic model of a typical commercial wind turbine is used to illustrate the methodology. © 2011 Elsevier Ltd.

Bianchi F.D.,Catalonia Institute for Energy Research IREC | Sanchez Pena R.S.,Buenos Aires Institute of Technology
Automatica | Year: 2011

Here, a methodology is presented which considers the interpolation of linear time-invariant (LTI) controllers designed for different operating points of a nonlinear system in order to produce a gain-scheduled controller. Guarantees of closed-loop quadratic stability and performance at intermediate interpolation points are presented in terms of a set of linear matrix inequalities (LMIs). The proposed interpolation scheme can be applied in cases where the system must remain at the operating points most of the time and the transitions from one point to another rarely occur, e.g., chemical processes, satellites. © 2010 Elsevier Ltd. All rights reserved.

Aguirre M.P.,Buenos Aires Institute of Technology | Aguirre M.P.,National University of La Plata | Calvino L.,Buenos Aires Institute of Technology | Calvino L.,TU Eindhoven | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2013

In this paper, a multilevel current-source inverter (MCSI) topology is analyzed. The issue of constructing a novel modular single-rating inductor MCSI is explored, taking advantage of the features of field-programmable gate arrays (FPGA) for control and gate signal generation. The proposed topology is built with identical modules where all inductors carry the same amount of current, simplifying the construction and operation of industrial applications with higher efficiency. A new state-machine approach, which is easy to implement in an FPGA, and a proper implementation of the phase-shifted carrier sinusoidal pulse width modulation (PSC-SPWM) allow both current balance in all modules and effective switching-frequency minimization. The performance of the MSCI proposed is simulated with Matlab and is verified by constructing a prototype. © 2012 IEEE.

Romanello M.B.,Buenos Aires Institute of Technology | Romanello M.B.,CONICET | Fidalgo de Cortalezzi M.M.,Buenos Aires Institute of Technology | Fidalgo de Cortalezzi M.M.,CONICET
Water Research | Year: 2013

The eventual future scenario of a release of nanomaterials into the environment makes it necessary to assess the risk involved in their use by studying their behavior in natural waters. NanoTiO2 is one of the most commonly employed nanomaterials. In the present work we studied the aggregation rates, aggregate size and aggregate morphology of NanoTiO2 under the presence of inert electrolytes, divalent cations, and these two combined with natural organic matter, in an effort to provide a comprehensive investigation of the phenomena of interaction of nanomaterials and natural waters and elucidate some of the conflicting information reported in the literature. The stability of nanoparticles could be explained in all cases, at least qualitatively, in terms of classical DLVO interactions (Electrical Double Layer, Van der Waals). Divalent cations were adsorbed to the surface of the nanoparticles, neutralizing the negative charge at pH values greater than the point of zero charge and inducing aggregation. Natural organic matter (NOM) adsorbed to the particles and made their zeta potential more negative, hence stabilizing them by lowering the pH of maximum aggregation. Divalent cations partially neutralized the adsorbed NOM, and at high concentrations aggregation was observed with Ca2+ but not Mg2+, suggesting the presence of specific Ca2+-NOM bridges. SEM images visually revealed a fractal-like morphology of the aggregates formed under unfavorable conditions. © 2013 Elsevier Ltd.

Colmegna P.,Buenos Aires Institute of Technology | Sanchez Pena R.S.,Buenos Aires Institute of Technology
Computer Methods and Programs in Biomedicine | Year: 2014

This work compares three well-known models and simulators in terms of their use in the analysis and design of glucose controllers for patients with Type 1 Diabetes Mellitus (T1DM). The objective is to compare them in practical scenarios which include: model uncertainty, time variance, nonlinearities, glucose measurement noise, delays between subcutaneous and plasma levels, pump saturation, and real-time controller implementation. The pros and cons of all models/simulators are presented. Finally, the simulators are tested with different robust controllers in order to identify the difficulties in the design and implementation phases. To this end, three sources of uncertainty are considered: nonlinearities, time-varying behavior (intra-patient) and inter-patient differences. © 2013 Elsevier Ireland Ltd.

Lauff D.B.,Buenos Aires Institute of Technology | Santa-Maria G.E.,Buenos Aires Institute of Technology
FEMS Yeast Research | Year: 2010

Cell culture in low potassium (K+) media has been associated to programmed cell death (PCD) in metazoans. In this study, deprivation of K + led Saccharomyces cerevisiae cells to a death process that involved phosphatidylserine externalization, changes in chromatin condensation, DNA and vacuole fragmentation as well as enhanced accumulation of reactive oxygen species. During the course of K+ starvation, plasma membrane hyperpolarization and increased accumulation of calcium (Ca2+) took place. The presence of rubidium (Rb+), a K+-analogue element, in the K+-deprived medium was accompanied by Rb+ accumulation but did not fully prevent the appearance of PCD markers. This argues for a specific effect of K+ on the course of cell death. While the absence of the YCA1 metacaspase did not have a major effect, the absence of TRK (transport of K+) K+-transporters led to changes in the pattern of annexin V/propidium iodide labeling. This change paralleled a fast accumulation of Ca2+. Addition of ethylene glycol tetraacetic acid improved growth and reduced cell death in trk1Δtrk2Δ cells. These findings reveal that K+ deprivation is sufficient to induce PCD in a cell-walled eukaryotic organism and suggest that the phenotype attributed to the lack of TRK genes is partially due to the effect of the encoded transporters on Ca2+ homeostasis. © 2010 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.

Saint-Nom R.,Buenos Aires Institute of Technology
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings | Year: 2010

The goal of this paper is to invite the reader to consider role-playing as a method to train Signal Processing students for professional functions they would undertake in their future careers. Interaction, communication skills and learning purposes of SP concepts are key elements of this approach. An example applied to Analog to Digital converters is detailed, to show the advantages of this technique and the enthusiasm awakened. ©2010 IEEE.

Castane-Selga R.,TU Munich | Sanchez Pena R.S.,Buenos Aires Institute of Technology
IEEE Transactions on Control Systems Technology | Year: 2010

Recent noise at work regulations in the EU (2003) have been established to prevent noise induced hearing loss (NIHL). This imposes better performance results to traditional feedback active noise control (ANC) in motorcycle helmets, which suffer from well known limitations. Here two new ideas are applied to this problem. First, an hybrid (feedforward/feedback) linear time invariant (LTI) controller is designed for a motorcycle helmet ANC, which improves the resulting attenuation. This is achieved by adding an extra pair of microphones which measure the external noise that is then used as the feedforward input signal. In addition and to increase even more the resulting performance, the air velocity is measured in real-time and used as the parameter which schedules a linear parameter varying (LPV) feedback (FB) controller. This is combined with the previous feedforward (FF) controller, resulting in a time-varying hybrid controller. Both hybrid, LTI and LPV controllers are designed using linear matrix inequality (LMI)-based optimization. Two experiments have been carried out to measure the relation between external noise spectra and velocity: a wind tunnel test and a freeway ride experience. The resulting controllers are tested in a simulation which uses actual data obtained from the freeway experiment. The resulting attenuations in this motivating study seem promising for future controller tests to be performed in real-time, with the adequate hardware. © 2006 IEEE.

Vaisman A.,Buenos Aires Institute of Technology
Lecture Notes in Business Information Processing | Year: 2016

The availability of large repositories of semantically annotated data on the web is opening new opportunities for enhancing Decision-Support Systems. In addition, the advent of initiatives such as Open Data and Open Government, together with the Linked Open Data paradigm, are promoting publication and sharing of multidimensional data (MD) on the web. In this paper we address the problem of representing MD data using Semantic Web (SW) standards. We discuss how MD data can be represented and queried directly over the SW, without the need to download data sets into local data warehouses. We first comment on the RDF Data Cube Vocabulary (QB), the current W3C recommendation, and show that it is not enough to appropriately represent and query MD data on the web. In order to be able to support useful Online Analytical Process (OLAP) analysis, extension to QB, denoted QB4OLAP, has been proposed. We provide an in-depth comparison between these two proposals, and show that extending QB with QB4OLAP can be done without re-writing the observations, (the largest part of a QB data set). We provide extensive examples of the QB4OLAP representation, using a portion of the Eurostat data set and the wellknown Northwind database. Finally, we present a high-level query language, called QL, that allows OLAP users not familiar with SW concepts or languages, to write and execute OLAP operators without any knowledge of RDF or SPARQL, the standard data model and query language, respectively, for the SW. QL queries are automatically translated into SPARQL (using the QB4OLAP metadata) and executed over an endpoint. © Springer International Publishing Switzerland 2016.

Mancilla-Aguilar J.L.,Buenos Aires Institute of Technology | Garcia R.A.,Buenos Aires Institute of Technology
Automatica | Year: 2013

This paper deals with the stabilization of switched systems with respect to (w.r.t.) compact sets. We show that the switched system is stabilizable w.r.t. a compact set by means of a family of switched signals if and only if a certain control affine system whose admissible controls take values in a polytope is asymptotically controllable to that set. In addition we present a control algorithm that based on a family of open-loop controls which stabilizes the aforementioned control system, a model of the system and the states of the switched system, generates switching signals which stabilize the switched system in a practical sense. We also give results about the convergence and the robustness of the algorithm. © 2012 Elsevier Ltd. All rights reserved.

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