Juan J. Villacorta

• University of Valladolid

Preserved listed building facades may require large-scale and highly technical work when the supporting building structure is at serious risk of collapse. Such is the case described in this paper, where vast facades must be cut into large panels up to 200 m² and 150 t in weight and carefully laid on the ground. Various engineering works must be car...

In biometrics, classification techniques are based on parameter extraction from a large data set, such as fingerprints. Specifically, when using 3D acoustic images, it is necessary to extract a set of meaningful parameters. This work assumes that each significant target will have an acoustic image characterized by the 2D radiation pattern of the ar...

In the field of human detection using acoustic arrays, the design of beamforming and detection algorithms is of vital importance. Evidently, the acoustic echo is directly dependent on the ergonomic characteristics of the people, as well as on the clothes they are wearing. Traditional techniques use a large set of people to characterize the system a...

One of the most popular options in the Structural Health Monitoring field is the tracking of the modal parameters, which are estimated through the frequency response functions of the structure, usually in the form of accelerances, which are computed as the ratio between the measured accelerations and the applied forces. This requires the use of dev...

Pedestrian detection by a car is typically performed using camera, LIDAR, or RADAR-based systems. The first two systems, based on the propagation of light, do not work in foggy or poor visibility environments, and the latter are expensive and the probability associated with their ability to detect people is low. It is necessary to develop systems t...

This paper presents the design, development and testing of a low-cost Structural Health Monitoring (SHM) system based on MEMS (Micro Electro-Mechanical Systems) triaxial accelerometers. A new control system composed by a myRIO platform, managed by specific LabVIEW software, has been developed. The LabVIEW software also computes the frequency respon...

This paper presents the comparison of three methodologies to detect if some fans in a matrix are not working properly. These methodologies are based on detecting fan failures by analysing acoustic images of the fan matrix, obtained using a planar array of MEMS microphones. Geometrical parameters of these acoustic images for different frequencies ar...

Detecting and finding people are complex tasks when visibility is reduced. This happens, for example, if a fire occurs. In these situations, heat sources and large amounts of smoke are generated. Under these circumstances, locating survivors using thermal or conventional cameras is not possible and it is necessary to use alternative techniques. The...

A methodology to detect if a fan matrix is working properly has been designed and is presented in this paper. This methodology is based on a Support Vector Machine (SVM) classifier that uses geometrical parameters of the acoustic images of the fan matrix. These acoustic images have been obtained using a 16 × 16 planar array of MEMS microphones work...

Condition monitoring and fault diagnosis of complex mechanical systems were based on vibration analysis in the last decades. The sensors which were employed in these methods needed to be in contact with the vibrant surfaces of the machines. This fact was an important limitation of the corresponding methodologies. In the last years, this problem is...

Using arrays with digital MEMS (Micro-Electro-Mechanical System) microphones and FPGA-based (Field Programmable Gate Array) acquisition/processing systems allows building systems with hundreds of sensors at a reduced cost. The problem arises when systems with thousands of sensors are needed. This work analyzes the implementation and performance of...

This paper proposes the use of a signal acquisition and processing system based on an 8×8 planar array of MEMS (Microelectromechanical Systems) microphones to obtain acoustic images of a fan matrix. A 3×3 matrix of PC fans has been implemented to perform the study. Some tests to obtain the acoustic images of the individual fans and of the whole mat...

Using arrays with digital MEMSmicrophones and FPGA-based acquisition/processing systems allows to build systems with hundreds of sensors at a reduced cost. This work analyzes the performance of a virtual array with 6400 MEMS (80 × 80) microphones. The system is composed by a 2D positioning system that places a physical array of 64 microphones (8 ×...

During the last decades, vibration analysis has been used to evaluate condition monitoring and fault diagnosis of complex mechanical systems. The problem associated with these analysis methods is that the employed sensors must be in contact with the vibrant surfaces. To avoid this problem, the current trend is the analysis of the noise, or the acou...

This paper proposes a scalable and multi-platform framework for signal acquisition and processing, which allows for the generation of acoustic images using planar arrays of MEMS (Micro-Electro-Mechanical Systems) microphones with low development and deployment costs. Acoustic characterization of MEMS sensors was performed, and the beam pattern of a...

Drawing on the results of an acoustic biometric system based on a MSE classifier, a new biometric system has been implemented. This new system preprocesses acoustic images, extracts several parameters and finally classifies them, based on Support Vector Machine (SVM). The preprocessing techniques used are spatial filtering, segmentation—based on a...

On the basis of an acoustic biometric system that captures 16 acoustic images of a person for 4 frequencies and 4 positions, a study was carried out to improve the performance of the system. On a first stage, an analysis to determine which images provide more information to the system was carried out showing that a set of 12 images allows the syste...

During the operation of the multifunction radar system, all the tasks related to the functions of the radar must be launched. The key element of the radar responsible for managing all these tasks is the task scheduler. Many scheduling techniques give good results at the expense of too complex and expensive designs. This study presents the results o...

Due to the widespread use of acoustic arrays, optimisation techniques for array design, focused on improving array performance, have been widely published. This paper exploits the statistical relation between different measures of sidelobe levels and the spacing of elements in random linear arrays made up of a small number of sensors. This paper de...

This paper shows how virtualization techniques can be introduced into the grid computing infrastructure to provide a transparent and homogeneous scientific computing environment. Today’s trends in grid computing propose a shared model where different organizations make use of a heterogeneous grid, frequently a cluster of clusters (CoC) of computing...

The rising older people population has increased the interest in Ambient Assisted Living systems. This article presents a system for monitoring the disabled or older persons developed from an existing surveillance system. The modularity and adaptability characteristics of the system allow an easy adaptation for a different purpose. The proposed sys...

An acoustic electronic scanning array for acquiring images from a person using a biometric application is developed. Based on pulse-echo techniques, multifrequency acoustic images are obtained for a set of positions of a person (front, front with arms outstretched, back and side). Two Uniform Linear Arrays (ULA) with 15 λ/2-equispaced sensors have...

This paper shows how virtualization techniques can be introduced into the grid computing infrastructure to provide a transparent and homogeneous scientific computing environment. Today’s trends in grid computing propose a shared model where different organizations make use of a heterogeneous grid, frequently a cluster of clusters (CoC) of computing...

This article summarizes several analyses on employing an iterative learning method of the Computational Artificial Intelligence field, a Genetic Algorithm, focused on designing linear arrays. The objective of these analyses is the effectiveness improvement of these evolutive algorithms in this particular problem. The influence of giving certain val...

An acoustic electronic scanning array is developed to acquire acoustic images from a person. On the basis of pulse-echo techniques, multifrequency acoustic images are obtained for a set of positions of a person (front, front with arms outstretched, back and side). Two uniform linear arrays with 15 l/2-equispaced sensors have been employed, using di...

A simple “ad hoc” method that allows the calibration of both sensor arrays, in transmission and in reception, for narrow-band acoustic radar systems using beamforming techniques is presented in this paper. This system uses low cost sensors and amplifiers, and for them there are not calibration data of phase and gain characteristics. Using a referen...

The main goal of the project described in this paper is to create a security system using autonomous surveillance robots that use SODAR-like detection system sensors, working with acoustic signals in air environment and navigation base on Geographic Information System and Markov's models. The surveillance system based on SONAR provides great inform...

This paper shows that using arrays with directive sensors makes the invariance hypothesis no longer valid. Sidelobe level increments around 5dB can be observed if directive sensors

The increasing elderly population has increased interest in the Ambient Assisted Living systems. This article presents a system for monitoring the disabled or elderly developed from an existing surveillance system. The modularity and adaptability characteristics of the system allow an easy adaptation for a different purpose. The proposed system use...

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Inside the set of systems that constitute the avionics, the radar on board is one of the principal systems, both for the commercial and the military aircraft. For a few years ago, the technologies of electronic exploration arrays are used in the radar design, and specially, in the combat fighters, where the detection and tracking of multiple target...

A system of supervision to disabled or aged people and enclosure access control has been developed. It integrates three types of sensors (acoustic, video and smart cards), and at the same time it is capable of interact with other safety systems. These system characteristics are: being robust, modular and extensible, as well as functional and ease t...

This paper describes Matlab access within the XBDK (XML-Based Beamforming Development Kit) platform. A well-known script language named Tcl/Tk has been used to perform Matlab COM interfacing, a powerful and little known mechanism, provided by Matlab Automation Server. Automation processing or prototype development, take advantage from script langua...

This paper describes Matlab access within the XBDK (XML-Based Beamforming Development Kit) platform. A well-known script language named Tcl/Tk has been used to perform Matlab COM interfacing, a powerful and little known mechanism, provided by Matlab Automation Server. Automation processing or prototype development, take advantage from script langua...

Radar systems require complex implementation and tests that not always are available for researchers. That is why modelling and simulation methodologies are often necessary to perform radar processing algorithms. These skills are effective such as for realizing the design, model and experiments, and as for the validity of the obtained results. The...

Due to the widespread use of sensor arrays, a great variety of design techniques have been developed, adjusting the excitation of the sensors and/or their positions. It has been observed that most of these techniques work under the assumption of invariance in the beampattern, in the sen (thetas) domain, of arrays formed by omnidirectional sensors....

En esta comunicación presentamos un sistema de vigilancia que utiliza la información obtenida a partir de múltiples sensores. La definición de tareas y eventos gestionados por el módulo principal, permite que el sistema puede adaptarse, bien cambiando la forma de trabajo o bien agregando módulos nuevos. El uso de un módulo de clasificación permite...

In this paper we present a complete classification system that uses information obtained from several media devices. The definition of tasks and events managed by the core module allows that the system can be adapted, changing the how the system works or adding new modules. The use of a classification module allows the human supervision contributin...

This contribution presents a distance learning model based on the traditional educational model that joins synchronous and asynchronous communication components. We also analyze the integration of the proposed model to teach a subject whose educational methodology is based on the resolution of practical exercises in a laboratory. This adaptation pr...

In applications such mobile or dynamic positioning of acoustic radars, it is necessary to develop a wireless interface to exchange data and synchronization. This development is intended to provide a low cost infrared communication interface that permits data interchange and synchronization capabilities. This interface performs physical communicatio...

The purpose of this paper is the analysis and design of a model specially oriented to build beamforming applications that allows software reusability of components previously made. Over this model (definition layer), it is possible to develop into different layers application tools to build generic software, specific models for beamforming, etc. In...

This contribution presents a tele -education model based on the traditional educational model that joins synchronous and asynchronous communication components. Also, we analyze the integration of the proposed model to teach a subject whose educational methodology is based on the resolution of practical exercises in a laboratory. This adaptation pro...

RESUMEN El presente documento expone los procedimientos de diseño, implementación y validación seguidos a lo largo del desarrollo de un simulador de la acústica de recintos con fuentes sonoras y micrófonos. En el diseño del simulador se sigue la técnica de modelado acústico de recintos basada en rayos image-source debido a su simplicidad en el cálc...

The present study presents a model of a monitoring system based on two complementary sensorial systems (image+acoustics), which allow the information received to fuse, and to prioritize the computational resources towards the zones of major risk. The system is composed of sensors distributed through the monitoring space, a data network, and a centr...

The present publication shows a model of a monitoring system of high benefit, based on two complementary sensorial systems (image+acoustics), which allows the information received to fuse, and to prioritize the computational resources toward the zones with considerable risk. The application uses components such as: active acoustic radar based on a...

The paper shows a distance learning system with huge benefits, that incorporates two methodologies for distance learning: with and without the presence of the teacher, professor or speaker. This system allows giving a class in real time, creating and studying multimedia courses. For the interactive courses, the system uses several protocols over IP...

The article presents a model of a monitoring system with high benefits, based on two complementary sensorial systems (images and acoustics), that allow the information received to fuse, and to prioritize the computational resources towards the zones with considered risks. The application uses components developed completely in the Multimedia Techno...

A description of a platform for practical developing of experimental video and image coding and compression systems is presented in this paper. In the first instance the last techniques and standards on video and image coding and compression are analyzed and must be the ones the final application will be concerned with. Later on, what hardware is o...

An implementation of a distance-measuring real time system by using the fixed-point digital signal processor TMS320C26 with a friendly user's interface for Windows is presented in this paper. First, the main system characteristics are going to be explained, mainly the flow diagram the DSP is to be running continuously and which can be reflected on...

In this contribution, a voice spreading system has been analyzed. This system has been developed on PC platform with Windows 3.1. Multimedia ToolBook framework has been employed for user interface implementation. The paper establish a methodology for intercommunicate: i) the sound card, ii) tcp/ip libraries and iii) ToolBook Author Language system.