http://hdl.handle.net/2117/3656 2013-05-20T19:21:50Z http://hdl.handle.net/2117/18537 Title: Biological and anthropogenic sound sources: effects and control in the European Seas Observatory Network (ESONET) Authors: André, Michel; Manuel Lázaro, Antonio; Dañobeitia, Juan José; Rolin, Jean-François; Person, Roland 2013-04-02T11:07:14Z http://hdl.handle.net/2117/18391 Title: Citizen Science and marine community monitoring by video-cabled observatories: the OBSEA Citizen Science Project Authors: Río Fernandez, Joaquín del; Aguzzi, Jacopo; Hidalgo Castro, Alberto; Bghiel, Ikram; Manuel Lázaro, Antonio; Sbragaglia, Valerio; Sardà Amills, Francesc Abstract: The Citizen Science refers to the public participation in scientific activities and research projects related with environment and its biodiversity are taking advantage of new technologies such us internet and mobile phones with recording capabilities for an easy data collection and sharing. In this paper, we presented a Citizen Science experience with the OBSEA costal-cabled video-observatory, deployed in western Mediterranean in 2009. A local biodiversity survey is going to be conducted by citizens as generic non-experienced users, high- school students, and amateur divers helping to identify and classify fishes appearing within different digital products such as time-lapse images and footages. Accordingly, we implemented a protocol for the web-based species identification supervised by scientists, in order to evaluate the different performances for each group. 2013-03-19T10:53:13Z http://hdl.handle.net/2117/18388 Title: The use of coastal cabled video-observatories to monitor seasonal changes in shallow water fish community Authors: Sbragaglia, Valerio; Aguzzi, Jacopo; Santamaria, Josep; Manuel Lázaro, Antonio; Río Fernandez, Joaquín del; Nogueras Cervera, Marc; Sardà Amills, Francesc 2013-03-19T09:59:32Z http://hdl.handle.net/2117/17659 Title: Real-time speaker verification system implemented on reconfigurable hardware Authors: Ramos Lara, Rafael Ramón; López García, Mariano; Canto Navarro, Enrique Fernando; Puente Rodriguez, Luis Abstract: Nowadays, biometrics is considered as a promising solution in the market of security and personal verification. Applications such as financial transactions, law enforcement or network management security are already benefitting from this technology. Among the different biometric modalities, speaker verification represents an accurate and efficient way of authenticating a person’s identity by analyzing his/her voice. This identification method is especially suitable in real-life scenarios or when a remote recognition over the phone is required. The processing of a signal of voice, in order to extract its unique features, that allows distinguishing an individual to confirm or deny his/ her identity is, usually, a process characterized by a high computational cost. This complexity imposes that many systems, based on microprocessor clocked at hundreds of MHz, are unable to process samples of voice in real-time. This drawback has an important effect, since in general, the response time needed by the biometric system affects its acceptability by users. The design based on FPGA (Field Programmable Gate Arrays) is a suited way to implement systems that require a high computational capability and the resolution of algorithms in real-time. Besides, these devices allow the design of complex digital systems with outstanding performance in terms of execution time. This paper presents the implementation of a MFCC (Mel-Frequency Cepstrum Coefficients)—SVM (Support Vector Machine) speaker verification system based on a low-cost FPGA. Experimental results show that our system is able to verify a person’s identity as fast as a high-performance microprocessor based on a Pentium IV personal computer. 2013-02-12T13:39:36Z http://hdl.handle.net/2117/17640 Title: Near-bottom sediment dynamics on highly-protected beaches The Coastal Ocean Observatory of Barcelona Authors: Antonijuan Rull, Josefina; Guillen, J.; López, Laura; Simarro Grande, Gonzalo Abstract: This article presents some preliminary results of the sedimentary dynamics measured during 5 months in Barcelona city beaches (NW Mediterranean). Wave storms, resuspension events and near-bottom sediment fluxes are analyzed in order to characterize the sedimentary behavior of highly-protected beaches. 2013-02-11T16:48:14Z http://hdl.handle.net/2117/17611 Title: Data acquisition system for volcanic seismic Authors: Carreras Pons, Normandino; Gomáriz Castro, Spartacus; Parisi Baradad, Vicenç; Río Fernandez, Joaquín del Abstract: This paper presents a design that is being created for the acquisition of volcanic seismic data. This system is composed by a microcontroller to management the peripherals, a module to acquire the information of seismic sensor and the module of communications that is composed of the RF and the GPS system. The prototype will be a very low power system and it will allow work during a complete year. 2013-02-08T13:15:42Z http://hdl.handle.net/2117/17600 Title: Ballast system for Guanay II AUV Authors: González Agudelo, Julián; Masmitja Rusinyol, Ivan; Gomáriz Castro, Spartacus 2013-02-07T17:51:33Z http://hdl.handle.net/2117/17599 Title: Salinity studies in mar Menor using Guanay II AUV Authors: González Agudelo, Julián; Masmitja Rusinyol, Ivan; Río Fernandez, Joaquín del; Gomáriz Castro, Spartacus 2013-02-07T17:08:32Z http://hdl.handle.net/2117/16993 Title: Efficient cubic spline interpolation implemented with FIR filters Authors: Ferrer Arnau, Luis Jorge; Reig Bolano, Ramon; Marti Puig, Pere; Manjabacas, A.; Parisi Baradad, Vicenç Abstract: Classical Cubic spline interpolation needs to solve a set of equations of high dimension. In this work we show how to compute the interpolant using a FIR digital filter, with a reduced number of operations per interpolated point and high accuracy. Additionally, the computation can be made on real time as the signal samples are acquired. Following this approach, we show how to obtain easily the derivatives of the interpolant in a similar way, and also signal approximations to reduce the oscillations that appear when using high order splines. These techniques are very well suited to compute continuous representations of image contours on closed shapes and to find its curvature and singularities. 2012-11-22T10:53:46Z http://hdl.handle.net/2117/16992 Title: Efficient implementation with FIR filters of operators based on B-splines to represent and classify signals of one and two dimensions Authors: Ferrer Arnau, Luis Jorge; Parisi Baradad, Vicenç 2012-11-22T09:39:01Z http://hdl.handle.net/2117/16699 Title: AUV based multi-vehicle collaboration: Salinity studies in Mar Menor coastal lagoon Authors: Lopez, F; González Agudelo, Julián; Masmitja, Ivan; Gomáriz Castro, Spartacus; Molino, Erik; Río Fernandez, Joaquín del; Manuel Lázaro, Antonio; Busquets, J; Guerrero, A; Martins, R; Sousa, A; Pinto, J; Calado, P; Sousa, J; Ridao, P; Candela, C; Carrera, A; Ribas, D; Carreras, M; Borrajo, D; Gilabert, J; Rajan, R; McCann, M; Gonzalez, I; Torres, S; Olaya, A; Garau, B Abstract: An experiment with different AUVs was carried out in the Mar Menor Coastal Lagoon from October 31 to November 5 in order to measure and assess the influence of the water from the Mar Menor on the adjacent area of the Mediterranean. This was carried out as a result of the meeting held between several institutions from the Iberian Peninsula and EEUU (see Vilanova Marine Science/Robotics Meeting 2010). The experiment was to launch several AUVs at the same time in different zones of the Mediterranean and Mar Menor lagoon. AUVs took salinity data trying to do a coordinated mission during two operative days (November 3 and November 5). Others days of the experiment were used to the vehicle’s preparation and error correction (November 2 and November 4). This paper presents the steps followed in preparation and operative days with the set of AUVs. This paper presents also the salinity results obtained during these missions. 2012-10-09T18:26:01Z http://hdl.handle.net/2117/16586 Title: Evaluation of the R&R and the compatibility index for non-independent measurements Authors: Garcia Benadí, Albert; Molino Minero, Erik; Río Fernandez, Joaquín del; Manuel Lázaro, Antonio Abstract: This paper describes the methodology of the compatibility criteria “En” and the methodology of R&R. With this paper we’ll use the methodology R&R for the evaluation of the compatibility criteria between the staff of the laboratories, where independent measurements aren’t insured. 2012-09-26T12:38:02Z http://hdl.handle.net/2117/16439 Title: Seasonal rhythm in a Mediterranean coastal fish community as monitored by a cabled observatory Authors: Condal, Fernando; Aguzzi, Jacopo; Sardà Amills, Francesc; Nogueras Cervera, Marc; Cadena Muñoz, Francisco Javier; Costa, Corrado; Río Fernandez, Joaquín del; Manuel Lázaro, Antonio Abstract: To adequately describe seasonal rhythms in habitat utilization by fish communities, observations are needed that occur at a relatively high frequency and over large temporal windows. For the first time, images collected from a cabled video-observatory (the western Mediterranean expandable SEAfloor OBservatory; OBSEA) were utilized to examine habitat utilization by coastal fishes. Over the course of a year, hourly digital images of the water column and an artificial reef were obtained during daylight hours. For each image, the total number of species, an estimate of the abundance of individuals, and the Shannon Diversity Index were quantified. A total of 22 fish species commonly associated with nearshore western Mediterranean habitats were identified, and significant spatial (water column vs. artificial reef), seasonal (spring, summer, autumn, and winter), and daily (morning, midday, and sunset) differences in habitat utilization occurred. Four species (Diplodus vulgaris, Diplodus cervinus, Diplodus sargus, and Scorpaena porcus) were associated with the artificial reef, while one species (Pagrus pagrus) chiefly occurred in the water column. Chromis chromis and Diplodus annularis occurred at the site more frequently in the winter and autumn, respectively, while 14 other species utilized the site more frequently in either the spring (8 spp) or summer (6 spp). In addition, Dentex dentex and Spicara maena occurred more frequently at sunset, while D. cervinus displayed a crepuscular rhythm (occurring more frequently in the morning and at sunset). Species diversity was highest in the summer and lowest in the winter. If not taken into account when planning in situ sampling, such seasonal and/or diel differences may lead to spurious estimates of population sizes and biodiversity. We suggest that cabled video-observatories offer a non-invasive and reliable technology for faunistic sampling and population assessment in coastal water of the Mediterranean and likely elsewhere. 2012-09-06T07:11:10Z http://hdl.handle.net/2117/16027 Title: Limitations of linear control for Cormoran-AUV Authors: González Agudelo, Julián; Benezra, Andreina; Gomáriz Castro, Spartacus; Sarriá Gandul, David Abstract: This work shows a mathematic calculation of the hydrodynamic model for the Cormoran-AUV, together with a linear controller which is valid in a certain range of speeds. It also presents the navigation instruments needed to work correctly. The mathematic model has been simplified to three degrees of freedom of movement and the whole system has been simulated using the Matlab Simulink Software. The system has been linearized for different velocities to design a linear control PD for each one of them. The performance of each PD controller is studied, and some limitations in the implementation of the control have been detected. For the case of low speeds, the desired path doesn’t reach the goals of control’s design using the non-linear model. This behavior motivated the search of a valid range of speeds for the nonlinear model. Different paths have been simulated using this control and their results have been compared trhough the performance in the rising time and the establish time. 2012-06-12T13:58:22Z http://hdl.handle.net/2117/16012 Title: Near bottom sediment dynamics on highly protected beaches Authors: Antonijuan Rull, Josefina; Guillen, J.; López, Laura; Simarro Grande, Gonzalo Abstract: This article presents some preliminary results of the sedimentary dynamics measured during 5 months in Barcelona city beaches (NW Mediterranean). Wave storms, resuspension events and near-bottom sediment fluxes are analyzed in order to characterize the sedimentary behavior of highly-protected beaches. 2012-06-11T12:47:42Z