On Grid Codes

If $A_{i}$ is finite alphabet for $i=1,...,n$, the Manhattan distance is defined in $\prod_{i=1}^{n}A_{i}$. A grid code is introduced as a subset of $\prod_{i=1}^{n}A_{i}$. Alternative versions of the Hamming and Gilbert-Varshamov bounds are presented for grid codes. If $A_{i}$ is a cyclic group for $i=1,...,n$, some bounds for the minimum Manhattan distance of codes that are cyclic subgroups of $\prod_{i=1}^{n}A_{i}$ are determined in terms of their minimum Hamming and Lee distances. Examples illustrating the main results are provided

Examples of non-strong fuzzy metrics

Answering a recent question posed by Gregori et al. [On a class of completable fuzzy metric spaces, Fuzzy Sets and Systems 161 (2010), 2193-2205] we present two examples of non-strong fuzzy metrics (in the sense of George and Veeramani). © 2010 Elsevier B.V. All rights reserved.This research was supported by the Ministry of Science and Innovation of Spain under Grants MTM2009-12872-C02-01 and MTM2009-12872-C02-02. J. Gutierrez Garcia also acknowledges financial support from the University of the Basque Country under Grant GIU07/27.Gutiérrez García, J.; Romaguera Bonilla, S. (2011). Examples of non-strong fuzzy metrics. Fuzzy Sets and Systems. 162(1):91-93. https://doi.org/10.1016/j.fss.2010.09.017S9193162

Análisis técnico-económico de las explotaciones caprinas de raza Malagueña: Estrategias de mejora de su viabilidad

publishedTomo I . Sección: Sistemas Ganaderos-Economía y Gestión. Sesión: Economía I. Ponencia nº 1

An Ontology Model to Support the Automated Evaluation of Software

Even though previous research has tried to model Software Engineering knowledge, focusing either on the entire discipline or on parts of it, we lack an integrated conceptual model for representing software evaluations, and we also lack the information related to them that supports their definition and enables their automation and reproducibility. This paper presents an extensible ontology model for representing software evaluations and evaluation campaigns, i.e., worldwide activities where a group of tools is evaluated according to a certain evaluation specification using common test data. During the development of the ontologies, we have reused current standards and models and have linked these ontologies with some renowned ones

El papel morfogenético dominante de la escorrentía superficial en Licus Vallis, Marte: Resultados del análisis geomorfológico y morfométrico

Se ha analizado la cuenca de Licus Vallis, un antiguo cauce situado en la región ecuatorial de Marte, con la finalidad de evaluar el papel morfogenético que tuvo el agua superficial en su desarrollo. El análisis geomorfológico llevado a cabo en un entorno SIG ha permitido identificar numerosas morfologías fluviales relictas como canales, terrazas simétricas y un delta. Licus Vallis presenta una cuenca con rasgos propios de un relieve joven, con un perfil en desequilibrio, canales de cuarto orden, valles en V, una densidad de drenaje muy baja, y un patrón dendrítico. La erosión generada por la escorrentía superficial parece ser el proceso dominante en la formación de Licus Vallis. Sin embargo, la presencia de valles con cabecera semicircular parece indicar que la erosión asociada a surgencias pudo contribuir a la expansión por erosión remontante de los valles. Además, el hallazgo, por primera vez en este trabajo, de un posible delta de tipo Gilberten la desembocadura del sistema fluvial permitió definir el nivel de base de la cuenca y plantear la posible existencia de un antiguo mar en la región. A watershed analysis was performed to assess the morphogenetic role of surface water on the development of Licus Vallis, an ancient river valley located in the equatorial region of Mars. Terrain analysis in a GIS environment allowed the identification of numerous relict fluvial features such as channels, paired terraces and a delta. Licus Vallis has the characteristics of a young watershed with a non-equilibrium profile, fourth-order streams, V-shaped valleys, very low drainage density, and a dendritic drainage pattern. Erosion related to surface runoff appears to be the dominant process involved in the formation of Licus Vallis. Nevertheless, the presence of theatre-like valley heads seems to indicate that sapping erosion associated with springs may have played some role in the headward expansion of valleys. Moreover, the finding, for the first time in this work, of a possible Gilbert-type delta at the mouth of the fluvial system permitted to define the paleobase level of the drainage basin and suggests the existence of an ancient sea in the region

An intelligent strategy for tactical movements of UAVs in disaster scenarios

Unmanned Aerial Vehicles (UAVs) are envisioned as flexible and fast-deploying communication network for disaster scenarios, where the typical communication infrastructure is likely to be malfunctioning. A few works propose UAVs for building communication links autonomously between rescue team’s members in disaster scenarios. The techniques used are usually based on navigation, positioning, and signal strength processing. However, these techniques may not be enough if the objective is to provide communication services to the maximum number of victims and rescuers and not only to a few rescuers. In this situation, dissimilarity metrics, like the Jaccard distance, can provide information about whether the communication service provided to victims is efficient or not (e.g., providing a better distribution of the victims assigned to each UAV acting as service provider). We propose an intelligent strategy that allows UAVs to perform tactical movements in a disaster scenario, combining the Jaccard distance and artificial intelligence algorithms like hill climbing and simulated annealing. Our strategy maximizes the number of victims that are serviced by the UAVs while avoiding network disconnections. Also, a mobility model specifically developed for modelling the victims’ movements within the incident site of a disaster scenario is propose

An evaluation methodology for reliable simulation based studies of routing protocols in VANETs

Vehicular Ad hoc networks (VANETs) have attracted much attention in the last decade. Many routing protocols have been proposed for VANETs and their performance is usually evaluated and compared using simulation-based studies. However, conducting reliable simulation studies is not a trivial task since many simulation parameters must be configured correctly. The selected parameters configuration can considerably affect the simulation results. This paper presents a methodology for conducting reliable simulations of routing protocols in VANETs urban scenarios. The proposed methodology includes relevant simulation aspects such as measurement period, selection of source-destination pairs for the communication traffic flows, number of simulations, mobility models based on road city maps, performance metrics and different analyses to evaluate routing protocols under different conditions. The proposed methodology is validated by comparing the simulation results obtained for Ad Hoc On-Demand Distance Vector (AODV) routing protocol with and without using the proposed methodology. The obtained results confirm that by using the proposed methodology, we can achieve more reliable simulations of VANETs routing protocols.Universidad de Sevilla. V Plan Propio de InvestigaciónMinisterio de Economía y Competitividad DPI2013-44278-

On-siteDriverID: A secure authentication scheme based on Spanish eID cards for vehicular ad hoc networks

Security in Vehicle Ad Hoc Networks (VANETs) has been a topic of interest since the origins of vehicular communications. Different approaches have been followed as new security threats have emerged in the last few years. The approach of conditional privacy has been widely used as it guarantees authentication among vehicles but not revealing their real identities. Although the real identity of the vehicle can be traced by the authorities, the process to do that is time consuming and typically involves several entities (for instance road authorities that request the identification, license plate records bodies, a judge to allow revealing the identity associated to a license plate…). Moreover, this process is always subsequent to the detection of a road situation that requires knowing the real vehicle identities. However, in vehicular scenarios, authorities would beneficiate from knowing the real drivers’ identity in advance. We propose in this paper On-SiteDriverID, a secure protocol and its application which allows authorities’ vehicles to obtain drivers’ real identities rapidly and on demand on VANET scenarios. Thus, authorities would be able to gather information about drivers and vehicles, allowing them to act in a safer and better manner in situations such as traffic control duties or emergencies. The obtained simulation results in real VANET scenarios based on real maps guarantee that in the 60–70% of cases the proposed On-SiteDriverID successfully obtains the identity of the driver

Cambios edáficos en las Marismas de Doñana y su relación con la invasión de Azolla filiculoide

2 páginas, 7 referencias. En el Capítulo: Degradación de suelos y desertificación. Simposio celebrado en Fuerteventura, 16-20, septiembre, 2007. Los editores son del Departamento de Edafología y Geología, Universidad de La Laguna.La Marisma de de Doñana es una extensa planicie dominada por suelos arcillosos, calcáreos y salinos (Clemente et al., 1998) que se inunda estacionalmente -por efecto de la lluvia y de algunos arroyos- y acoge a una de las poblaciones de aves acuáticas más importantes de Europa (Clemente et al. 2004). En 2001 uno de los autores (J.L. Espinar) documentó por primera vez la presencia del helecho de origen americano Azolla filliculoides, una especie invasora con capacidad para fijar el N atmosférico, que acabó extendiéndose por el humedal en los años siguientes (Cobo y Bañuls, 2005) En este trabajo se analizan los cambios ambientales ocurridos en la marisma de Doñana con anterioridad a la invasión, en relación con lo acaecido en anteriores episodios de invasión por Azolla de otras áreas naturales.Peer reviewe

Predictive Fault Diagnosis for Ship Photovoltaic Modules Systems Applications

[EN] In this paper, an application for the management and supervision by predictive fault diagnosis (PFD) of solar power generation systems is developed through a National Marine Electronics Association (NMEA) 2000 smart sensor network. Here, the NMEA 2000 network sensor devices for measuring and supervising the parameters inherent to solar power generation and renewable energy supply are applied. The importance of renewable power generation systems in ships is discussed, as well as the causes of photovoltaic modules (PVMs) aging due to superimposed causes of degradation, which is a natural and inexorable phenomenon that affects photovoltaic installations in a special way. In ships, PVMs are doubly exposed to inclement weather (solar radiation, cold, rain, dust, humidity, snow, wind, electrical storms, etc.), pollution, and a particularly aggressive environment in terms of corrosion. PFD techniques for the real-world installation and safe navigation of PVMs are discussed. A specific method based on the online analysis of the time-series data of random and seasonal I¿V parameters is proposed for the comparative trend analyses of solar power generation. The objective is to apply PFD using as predictor symptom parameter (PS) the generated power decrease in affected PVMs. This PFD method allows early fault detection and isolation, whose appearance precedes by an adequate margin of maneuver, from the point of view of maintenance tasks applications. This early detection can stop the cumulative degradation phenomenon that causes the development of the most frequent and dangerous failure modes of solar modules, such as hot-spots. It is concluded that these failure modes can be conveniently diagnosed by performing comparative trend analyses of the measured power parameters by NMEA sensors.García Moreno, E.; Quiles Cucarella, E.; Zotovic Stanisic, R.; Gutiérrez, SC. (2022). Predictive Fault Diagnosis for Ship Photovoltaic Modules Systems Applications. Sensors. 22(6):1-21. https://doi.org/10.3390/s2206217512122