Juan Manuel Gutiérrez

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Three phenolic compounds, i.e. phenol, catechol and 4-acetamidophenol, were simultaneously determined by voltammetric detection of its oxidation reaction at the surface of an epoxy-graphite transducer. Because of strong signal overlapping, Wavelet Neural Networks (WNN) were used in data treatment, in a combination of chemometrics and electrochemical(More)
This work reports the application of a voltammetric electronic tongue system (ET) made from an array of modified graphite-epoxy composites plus a gold microelectrode in the qualitative and quantitative analysis of polyphenols found in wine. Wine samples were analyzed using cyclic voltammetry without any sample pretreatment. The obtained responses were(More)
In the study of voltammetric electronic tongues, a key point is the preproces-sing of the departure information, the voltammograms which form the response of the sensor array, prior to classification or modeling with advanced chemometric tools. This work demonstrates the use of the discrete wavelet transform (DWT) for compacting these voltammograms prior to(More)
A Sequential Injection Analysis (SIA) system and an 8-potentiometric all-solid-state sensor array were coupled in a simple and automated electronic tongue device. The potentiometric sensors used were planar microfabricated structures with standard PVC membranes deposited onto a gold contact. The SIA system permitted the automated operation and generation of(More)
This work reports the application of a Bio-Electronic Tongue (BioET) system made from an array of enzymatic biosensors in the analysis of polyphenols, focusing on major polyphenols found in wine. For this, the biosensor array was formed by a set of epoxy-graphite biosensors, bulk-modified with different redox enzymes (tyrosinase and laccase) and copper(More)
—Introductory courses in CS, especially those aimed at introductory programming concepts or fundamental concepts in CS, represent the core courses which give the student specific insight into what the body of knowledge of Computer Science entails. Due to this great importance the curriculum planning of these courses should be undertaken with special care.(More)
The use of electronic tongues is proposed for two different environmental monitoring applications. This approach in chemical analysis consists of an array of nonspecific sensors coupled with a multivariate calibration tool. In this case, the proposed arrays were formed by potentiometric sensors based on polymeric membranes (PVC) and the subsequent(More)
The paper deals with recognition of artificial landmarks using fish-eye lens. The proposed recognition model is based on algebraic affine moment invariants (AMIs). Landmarks are used for the navigation of an autonomous robot, equipped with a fish-eye lens camera. The recognition ability of the AMIs regarding the deformation introduced by the fish-eye lens(More)
We describe a novel method for malicious code obfuscation that uses code already present in systems: a pseudo-random number generator. This can also be seen as an anti-disassembly and anti-debugging technique, depending on deployment , because the actual code does not exist until run – it is generated dynamically by the pseudo-random number generator. A(More)