183 research outputs found
Real-time motor rotation frequency detection with event-based visual and spike-based auditory AER sensory integration for FPGA
Multisensory integration is commonly
used in various robotic areas to collect more
environmental information using different and
complementary types of sensors. Neuromorphic
engineers mimics biological systems behavior to
improve systems performance in solving engineering
problems with low power consumption. This work
presents a neuromorphic sensory integration scenario
for measuring the rotation frequency of a motor using
an AER DVS128 retina chip (Dynamic Vision Sensor)
and a stereo auditory system on a FPGA completely
event-based. Both of them transmit information with
Address-Event-Representation (AER). This
integration system uses a new AER monitor hardware
interface, based on a Spartan-6 FPGA that allows two
operational modes: real-time (up to 5 Mevps through
USB2.0) and data logger mode (up to 20Mevps for
33.5Mev stored in onboard DDR RAM). The sensory
integration allows reducing prediction error of the
rotation speed of the motor since audio processing
offers a concrete range of rpm, while DVS can be
much more accurate.Ministerio de Economía y Competitividad TEC2012-37868-C04-02/0
Live Demonstration: Real-time motor rotation frequency detection by spike-based visual and auditory AER sensory integration for FPGA
Multisensory integration is commonly used in
various robotic areas to collect much more information from an
environment using different and complementary types of sensors.
This demonstration presents a scenario where the motor rotation
frequency is obtained using an AER DVS128 retina chip
(Dynamic Vision Sensor) and a frequency decomposer auditory
system on a FPGA that mimics a biological cochlea. Both of them
are spike-based sensors with Address-Event-Representation
(AER) outputs. A new AER monitor hardware interface, based
on a Spartan-6 FPGA, allows two operational modes: real-time
(up to 5 Mevps through USB2.0) and off-line mode (up to
20Mevps and 33.5Mev stored in DDR RAM). The sensory
integration allows the bio-inspired cochlea limit to provide a
concrete range of rpm approaches, which are obtained by the
silicon retina.Ministerio de Economía y Competitividad TEC2012-37868-C04-02/0
Multilayer Spiking Neural Network for Audio Samples Classification Using SpiNNaker
Audio classification has always been an interesting subject of research
inside the neuromorphic engineering field. Tools like Nengo or Brian, and hardware
platforms like the SpiNNaker board are rapidly increasing in popularity in
the neuromorphic community due to the ease of modelling spiking neural
networks with them. In this manuscript a multilayer spiking neural network for
audio samples classification using SpiNNaker is presented. The network consists
of different leaky integrate-and-fire neuron layers. The connections between them
are trained using novel firing rate based algorithms and tested using sets of pure
tones with frequencies that range from 130.813 to 1396.91 Hz. The hit rate
percentage values are obtained after adding a random noise signal to the original
pure tone signal. The results show very good classification results (above 85 %
hit rate) for each class when the Signal-to-noise ratio is above 3 decibels, validating
the robustness of the network configuration and the training step.Ministerio de Economía y Competitividad TEC2012-37868-C04-02Junta de Andalucía P12-TIC-130
IDOLO: Multimedia Data Deployment on SCADA Systems
IDOLO project was born with the objective of
adding audiovisual information to the usually text-based
Human-Machine Interfaces (HMI) used on Supervisory Control
And Data Acquisition (SCADA) systems. This is not a simple
task, as SCADA systems have traditionally been based on
proprietary, low transmission speed networks, due to the special
requirements that such systems impose in terms of network
reliability and timing requirements.
Within this paper we describe our efforts on the design,
implementation and deployment of a networked computer
system that adds multimedia information to the usually textbased
SCADA/HMI systems. IDOLO system is based on wellknown
hardware and software solutions, such as Ethernet
networks or MPEG codecs, resulting in a flexible and
expandable system that has succesfully been deployed on a real
electrical facility
Embedded neural network for real-time animal behavior classification
Recent biological studies have focused on understanding animal interactions and welfare. To help biolo- gists to obtain animals’ behavior information, resources like wireless sensor networks are needed. More- over, large amounts of obtained data have to be processed off-line in order to classify different behaviors.There are recent research projects focused on designing monitoring systems capable of measuring someanimals’ parameters in order to recognize and monitor their gaits or behaviors. However, network unre- liability and high power consumption have limited their applicability.In this work, we present an animal behavior recognition, classification and monitoring system based ona wireless sensor network and a smart collar device, provided with inertial sensors and an embeddedmulti-layer perceptron-based feed-forward neural network, to classify the different gaits or behaviorsbased on the collected information. In similar works, classification mechanisms are implemented in aserver (or base station). The main novelty of this work is the full implementation of a reconfigurableneural network embedded into the animal’s collar, which allows a real-time behavior classification andenables its local storage in SD memory. Moreover, this approach reduces the amount of data transmittedto the base station (and its periodicity), achieving a significantly improving battery life. The system hasbeen simulated and tested in a real scenario for three different horse gaits, using different heuristics andsensors to improve the accuracy of behavior recognition, achieving a maximum of 81%.Junta de Andalucía P12-TIC-130
Dysprosium removal from water using active carbons obtained from spent coffee ground
This paper describes the physicochemical study of the adsorption of dysprosium (Dy^(3+)) in aqueous solution onto two types of activated carbons synthesized from spent coffee ground. Potassium hydroxide (KOH)-activated carbon is a microporous material with a specific Brunauer-Emmett-Teller (BET) surface area of 2330 m^2.g^-1 and pores with a diameter of 3.2 nm. Carbon activated with water vapor and N_2 is a solid mesoporous, with pores of 5.7 nm in diameter and a specific surface of 982 m^2.g^-1. A significant dependence of the adsorption capacity on the solution pH was found, but it does not significantly depend on the dysprosium concentration nor on the temperature. A maximum adsorption capacity of 31.26 mg.g^-1 and 33.52 mg.g^-1 for the chemically and physically activated carbons, respectively, were found. In both cases, the results obtained from adsorption isotherms and kinetic study were better a fit to the Langmuir model and pseudo-second-order kinetics. In addition, thermodynamic results indicate that dysprosium adsorption onto both activated carbons is an exothermic, spontaneous, and favorable process
Monitoring the phenolic ripening of red grapes using a multisensor system based on metal-oxide nanoparticles
Producción CientíficaThe maturity of grapes is usually monitored by means of the sugar concentration.
However, the assessment of other parameters such as the phenolic content is also
important because the phenolic maturity has an important impact on the organoleptic
characteristics of wines. In this work, voltammetric sensors able to detect phenols
in red grapes have been developed. They are based on metal oxide nanoparticles
(CeO2, NiO, and TiO2,) whose excellent electrocatalytic properties toward phenols
allows obtaining sensors with detection limits in the range of 10−8 M and coefficients
of variation lower than 7%. An electronic tongue constructed using a combination of the
nanoparticle-based sensors is capable to monitor the phenolic maturity of red grapes
from véraison to maturity. Principal Component Analysis (PCA) can be successfully used
to discriminate samples according to the ripeness. Regression models performed using
Partial Least Squares (PLS-1) have established good correlations between voltammetric
data obtained with the electrochemical sensors and the Total Polyphenolic Index, the
Brix degree and the Total Acidity, with correlation coefficients close to 1 and low number
of latent variables. An advantage of this system is that the electronic tongue can be used
for the simultaneous assessment of these three parameters which are the main factors
used to monitor the maturity of grapes. Thus the electronic tongue based on metal oxide
nanoparticles can be a valuable tool to monitor ripeness. These results demonstrate
the exciting possible applications of metal oxide nanoparticles in the field of electronic
tongues.Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (project AGL2015-67482- R)Junta de Castilla y Leon - Fondo Europeo de Desarrollo Regional (project VA011U16)Junta de Castilla y León (grant BOCYL-D-24112015-9
Estudio preliminar sobre la utilidad del color para clasificar los zumos de naranja según su elaboración
En este trabajo se caracteriza el color de los zumos de naranja comerciales y se explora la utilidad de las coordenadas cromáticas CIELAB para clasificarlos según el proceso de elaboración. 41 muestras de zumos comerciales 15 de ellos procedentes de zumo a base de concentrado (ZC) y 26 procedentes de naranjas exprimidas (ZE) fueron analizadas por espectrorradiometría. Se observaron diferencias significativas en todos los parámetros colorimétricos (p<0, 05) excepto para la coordenada L*. Los zumos procedentes de concentrado (ZC) presentaron un valor medio de croma de 63, 78±2, 36 y de tono 83, 42±2, 10, mientras que los zumos procedentes de naranjas exprimidas (ZE) presentaron mayores valores de croma (C* ab=73, 11±2, 62) y menores de tono (hab=80, 87º±1, 68º). Con el objetivo de determinar qué variables permiten clasificar los zumos según su proceso de fabricación, se realizó un análisis discriminante. Las mejores predicciones se obtuvieron para los modelos que incluían las variables L* y C* ab. La aplicación de las funciones discriminantes obtenidas a un set de 25 muestras de test, produjo un porcentaje de acierto del 100%.In this study the colour of commercial orange juices has been characterized and the utility of CIELAB colour coordinates to classify them according to their processing has been investigated.
41 samples of commercial orange juices, 15 from concentrate (ZC) and 26 from squeezed oranges (ZE) were analyzed by spectroradiometry. Significant differences were obtained in all colorimetric parameters (p<0.05) except for the coordinate L* . Juices made from concentrate (ZC) showed an average value for chrome of 63.7±2.36 and for hue 83.42±2.10, while squeezed orange juices (ZE) showed higher chrome values (C* ab=73.11±2.62) and lower hue values (hab=80.87º±1.68º). Discriminant analysis was performed with the aim of selecting the variables which allows the classification of the juices according to their manufacturing process. The best predictions were obtained for the models which included L* and C* ab variables. The application of the discriminant functions to a set of 25 juices, resulted in a 100% of correct classifications.Junta de Andalucía P08-AGR-0378
The advantages of disposable screen-printed biosensors in a bioelectronic tongue for the analysis of grapes
Producción CientíficaDisposable screen-printed sensors have been modified with enzymes and used to form a bioelectronic tongue dedicated to the discrimination between different grape varieties. The multisensory system combined serigraphied electrodes modified with carbon, platinum, gold, graphene, Prussian blue and nickel oxide nanoparticles (M-SPE) covered with glucose oxidase (M-GOX-SPE) or tyrosinase (M-Tyr-SPE).
The M-GOX-SPE and M-Tyr-SPE sensors produced a variety of responses due to the different behavior of the electron mediators of the six screen-printed materials used for the electro-catalysis of the glucose and phenols by means of glucose oxidase and tyrosinase.
This variety of responses, together with the capability of the sensors to detect glucose or phenols, allowed the bioelectronic tongue developed here to discriminate between the juices obtained from different varieties of grape.
Partial least-squares (PLS-1) multivariate calibration of electrochemical data has been successfully applied to the simultaneous determination of glucose and polyphenols in musts.
The discrimination capability shown by this array of cheap and single-use sensors was similar to that found in other complex bioelectronic tongues. The lower price, ease of use and portability of the modified screen-printed electrode system makes the bioelectronic tongue developed here an alternative tool that can be used in situ in the vineyard block.Ministerio de Economía, Industria y Competitividad – FEDER (Grant CICYT AGL2012-33535)Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA-032U13)University of Valladolid (PIF-UVa
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