Lp-operator algebras associated with oriented graphs

For each 1 ≤ p < ∞ and each countable oriented graph Q we introduce an L p -operator algebra O p (Q) which contains the Leavitt path C-algebra LQ as a dense subalgebra and is universal for those L p -representations of LQ which are spatial in the sense of N.C. Phillips. For Rn the graph with one vertex and n loops (2 ≤ n ≤ ∞), O p (Rn) = O p n , the L p -Cuntz algebra introduced by Phillips. If p < {1, 2} and S(Q) is the inverse semigroup generated by Q, O p (Q) = F p tight(S(Q)) is the tight semigroup L p -operator algebra introduced by Gardella and Lupini. We prove that O p (Q) is simple as an L p -operator algebra if and only if LQ is simple, and that in this case it is isometrically isomorphic to the closure ρ(LQ) of the image of any nonzero spatial L p -representation ρ : LQ → L(L p (X)). We also show that if LQ is purely infinite simple and p , p ′ , then there is no nonzero continuous homomorphism O p (Q) → Op ′ (Q). Our results generalize some similar results obtained by Phillips for L p -Cuntz algebras.Fil: Cortiñas, Guillermo Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Investigaciones Matemáticas "Luis A. Santaló". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Matemáticas "Luis A. Santaló"; ArgentinaFil: Rodríguez, María Eugenia. Universidad de Buenos Aires; Argentin

Uso da videoconsola Wii para a capacitación para a vida independente dende a perspectiva da terapia ocupacional

[Resumo] Obxectivo: O obxectivo xeral deste estudo é observar si existen modificacións no desempeño ocupacional nas actividades instrumentais da vida diaria de persoas con dano cerebral adquirido mediante un programa de intervención coa videoconsola Wii. Metodoloxía: Trátase dun estudo con metodoloxía mixta (cuantitativa e cualitativa), ambos métodos compleméntanse co fin de conseguir un maior entendemento do fenómeno. Resultados: Os resultados obtivéronse a partir do emprego de escalas de valoración, de unha entrevista semiestructurada e da observación participante. Apreciouse que o uso da videoconsola Wii modificou o desempeño ocupacional en actividades instrumentais da vida diaria, especialmente naquelas relacionadas co cociñar, manexar diñeiro e comprar e moverse na comunidade. Analizáronse antes e despois da intervención compoñentes cognitivos, nos cales apenas se observaron cambios. Conclusións: Establécese que a videoconsola Wii capacitou os dous participantes cara a vida independente, percibindo ambos unha mellora na súa calidade de vida e determinando que a intervención mellorou o desempeño ocupacional.[Resumen] Objetivo: El objetivo general de este estudio es observar si existen modificaciones en el desempeño ocupacional en las actividades instrumentales de la vida diaria de personas con daño cerebral adquirido, mediante un programa de intervención con la videoconsola Wii. Metodología: Se trata de un estudio con metodología mixta (cuantitativa y cualitativa), ambos métodos se complementan con el fin de conseguir un mayor entendimiento del fenómeno. Resultados: Los resultados se obtuvieron a partir del empleo de escalas de valoración, de una entrevista semiestructurada y de la observación participante. Se apreció que el uso de la videoconsola Wii modificó el desempeño ocupacional en actividades instrumentales de la vida diaria, especialmente en aquellas relacionadas con cocinar, manejar dinero y comprar y moverse en la comunidad. Se analizaron antes y después de la intervención componentes cognitivos, en los cuales apenas se observaron cambios. Conclusiones: Se establece que la videoconsola Wii capacitó a los dos participantes hacia la vida independiente, percibiendo ambos una mejora en su calidad de vida y determinando que la intervención mejoró el desempeño ocupacional.[Abstract] Objective: The general objective of this study is to observe if there are any changes on the occupational performance while doing everyday tasks for people with acquired brain damage, by means of an intervention program with the Wii game console. Methodology: This is a study with mixed methodology (quantitative and qualitative). Both methods complement each other with the aim to acquire a better understanding of the phenomenon. Results: The results were obtained from an evaluation scale, a semi- structured interview, and the participant’s observation. It was perceived that the use of the Wii game console changed the occupational performance in instrumental activities of the daily life in both participants of the study, especially in those related to cooking, money management and transactions, and move around the community. Cognitive components were analysed before and after the intervention and hardly any changes were noticed. Conclusions: It is settled that the Wii game console prepared both participants towards an independent life. Both noticed an improvement in their quality of life, and determined that the intervention improved their occupational performance.Traballo fin de grao (UDC.FCS). Terapia ocupacional. Curso 2014/2015

I Olimpiada Matemática Nacional Alevín

En junio de 2017 la Sociedad Melillense de Educación Matemática recibió el encargo por parte de la FESPM de organizar la I Olimpiada Matemática para alumnos de 5.o y 6.o de Primaria. Las Olimpiadas de Secundaria son una actividad asentada después de 29 ediciones, sin embargo a pesar de que se celebran numerosas Olimpiadas locales o autonómicas de Primaria organizadas por Sociedades de la FESPM, no se había convocado una Olimpiada Nacional. Melilla Ciudad Monumental, Televisión Melilla, CEIP España, Casio, editoriales Anaya, SM, Geeppard, Ciclo Formativo de Animación Sociocultural contribuyeron a la realización de la I Olimpiada

II Olimpiada Matemática Nacional Alevín

En junio de 2018 la Sociedad Melillense de Educación Matemática recibió el encargo por parte de la FESPM de organizar la II Olimpiada Matemática para alumnos de 5.º y 6.º de Primaria. El año anterior también recibimos este encargo y de nuevo la FESPM a través de sus Sociedades Federadas confió en nosotros para que la Olimpiada de Primaria, nuestra Olimpiada Alevín, diera su siguiente pasito como un recién nacido que quiere parecerse a su hermana mayor la Olimpiada de Secundaria, una actividad asentada después de 29 ediciones. Con todo nuestro cariño e ilusión comenzamos a trabajar para que aquellas Sociedades que no pudieron participar el año anterior lo pudieran hacer, promocionando la realización de numerosas Olimpiadas locales o autonómicas de Primaria organizadas por las Sociedades de la FESPM

Combining Multiple Granularity Variability in a Software Product Line Approach for Web Engineering

[Abstract] Context: Web engineering involves managing a high diversity of artifacts implemented in different languages and with different levels of granularity. Technological companies usually implement variable artifacts of Software Product Lines (SPLs) using annotations, being reluctant to adopt hybrid, often complex, approaches combining composition and annotations despite their benefits. Objective: This paper proposes a combined approach to support fine and coarse-grained variability for web artifacts. The proposal allows web developers to continue using annotations to handle fine-grained variability for those artifacts whose variability is very difficult to implement with a composition-based approach, but obtaining the advantages of the composition-based approach for the coarse-grained variable artifacts. Methods: A combined approach based on feature modeling that integrates annotations into a generic composition-based approach. We propose the definition of compositional and annotative variation points with custom-defined semantics, which is resolved by a scaffolding-based derivation engine. The approach is evaluated on a real-world web-based SPL by applying a set of variability metrics, as well as discussing its quality criteria in comparison with annotations, compositional, and combined existing approaches. Results: Our approach effectively handles both fine and coarse-grained variability. The mapping between the feature model and the web artifacts promotes the traceability of the features and the uniformity of the variation points regardless of the granularity of the web artifacts. Conclusions: Using well-known techniques of SPLs from an architectural point of view, such as feature modeling, can improve the design and maintenance of variable web artifacts without the need of introducing complex approaches for implementing the underlying variability.The work of the authors from the Universidad de Málaga is supported by the projects Magic P12-TIC1814 (post-doctoral research grant), MEDEA RTI2018-099213-B-I00 (co-financed by FEDER funds), Rhea P18-FR-1081 (MCI/AEI/FEDER, UE), LEIA UMA18-FEDERIA-157, TASOVA MCIU-AEI TIN2017-90644-REDT and, European Union’s H2020 research and innovation program under grant agreement DAEMON 101017109. The work of the authors from the Universidade da Coruña has been funded by MCIN/AEI/10.13039/501100011033, NextGenerationEU/PRTR, FLATCITY-POC: PDC2021-121239-C31 ; MCIN/AEI/10.13039/501100011033 EXTRACompact: PID2020-114635RB-I00 ; GAIN/Xunta de Galicia/ERDF CEDCOVID: COV20/00604 ; Xunta de Galicia/FEDER-UE GRC: ED431C 2021/53 ; MICIU/FEDER-UE BIZDEVOPSGLOBAL: RTI-2018-098309-B-C32 ; MCIN/AEI/10.13039/501100011033 MAGIST: PID2019-105221RB-C41Junta de Andalucía; P12-TIC-1814Universidad de Málaga; UMA18-FEDERIA-157Xunta de Galicia; COV20/00604Xunta de Galicia; ED431C 2021/53Junta de Andalucía; P18-FR-108

Context- and Template-Based Compression for Efficient Management of Data Models in Resource-Constrained Systems

The Cyber Physical Systems (CPS) paradigm is based on the deployment of interconnected heterogeneous devices and systems, so interoperability is at the heart of any CPS architecture design. In this sense, the adoption of standard and generic data formats for data representation and communication, e.g., XML or JSON, effectively addresses the interoperability problem among heterogeneous systems. Nevertheless, the verbosity of those standard data formats usually demands system resources that might suppose an overload for the resource-constrained devices that are typically deployed in CPS. In this work we present Context-and Template-based Compression (CTC), a data compression approach targeted to resource-constrained devices, which allows reducing the resources needed to transmit, store and process data models. Additionally, we provide a benchmark evaluation and comparison with current implementations of the Efficient XML Interchange (EXI) processor, which is promoted by the World Wide Web Consortium (W3C), and it is the most prominent XML compression mechanism nowadays. Interestingly, the results from the evaluation show that CTC outperforms EXI implementations in terms of memory usage and speed, keeping similar compression rates. As a conclusion, CTC is shown to be a good candidate for managing standard data model representation formats in CPS composed of resource-constrained devices.Research partially supported by the European Union Horizon 2020 Programme under Grant Agreement Number H2020-EeB-2015/680708 - HIT2GAP, Highly Innovative building control Tools Tackling the energy performance GAP. Also partially supported by the Department of Education, Universities and Research of the Basque Government under Grant IT980-16 and the Spanish Research Council, under grant TIN2016-79897-P

Multilevel Modeling of Geographic Information Systems Based on International Standards

Financiado para publicación en acceso aberto: Universidade da Coruña/CISUG[Abstract] Even though different applications based on Geographic Information Systems (GIS) provide different features and functions, they all share a set of common concepts (e.g., spatial data types, operations, services), a common architecture, and a common set of technologies. Furthermore, common structures appear repeatedly in different GIS, although they have to be specialized in specific application domains. Multilevel modeling is an approach to model-driven engineering (MDE) in which the number of metamodel levels is not fixed. This approach aims at solving the limitations of a two-level metamodeling approach, which forces the designer to include all the metamodel elements at the same level. In this paper, we address the application of multilevel modeling to the domain of GIS, and we evaluate its potential benefits. Although we do not present a complete set of models, we present four representative scenarios supported by example models. One of them is based on the standards defined by ISO TC/211 and the Open Geospatial Consortium. The other three are based on the EU INSPIRE Directive (territory administration, spatial networks, and facility management). These scenarios show that multilevel modeling can provide more benefits to GIS modeling than a two-level metamodeling approach.Xunta de Galicia; IN852A 2018/14Xunta de Galicia; ED431G 2019/01This work has been partially funded by grants: MICIU/FEDER-UE, MAGIST: PID2019-105221RB-C41; MICIU/FEDER-UEBIZDEVOPSGLOBAL: RTI-2018-098309-B-C32, Xunta de Galicia/FEDER-UE, ConectaPeme, GEMA: IN852A 2018/14; MINECOAEI/FEDER-UE Datos 4.0: TIN2016-78011-C4-1-R; MINECOAEI/FEDER-UE Velocity: TIN2016-77158-C4-3-R; CITIC research center funded by XUNTA and EU through the European Regional Development Fund- Galicia 2014-2020 Program, grant ED431G 2019/01. Funding for open access charge: Universidade da Coruña/CISUG

A Method for Dynamically Selecting the Best Frequency Hopping Technique in Industrial Wireless Sensor Network Applications

Industrial wireless applications often share the communication channel with other wireless technologies and communication protocols. This coexistence produces interferences and transmission errors which require appropriate mechanisms to manage retransmissions. Nevertheless, these mechanisms increase the network latency and overhead due to the retransmissions. Thus, the loss of data packets and the measures to handle them produce an undesirable drop in the QoS and hinder the overall robustness and energy efficiency of the network. Interference avoidance mechanisms, such as frequency hopping techniques, reduce the need for retransmissions due to interferences but they are often tailored to specific scenarios and are not easily adapted to other use cases. On the other hand, the total absence of interference avoidance mechanisms introduces a security risk because the communication channel may be intentionally attacked and interfered with to hinder or totally block it. In this paper we propose a method for supporting the design of communication solutions under dynamic channel interference conditions and we implement dynamic management policies for frequency hopping technique and channel selection at runtime. The method considers several standard frequency hopping techniques and quality metrics, and the quality and status of the available frequency channels to propose the best combined solution to minimize the side effects of interferences. A simulation tool has been developed and used in this work to validate the method.Research partially supported by the European Union's Seventh Framework Programme for research, technological development and demonstration under Grant Agreement Number FP7-SEC-2013-1/607292 ZONeSEC-Towards a EU framework for the security of Widezones, in the scope of the activities related to develop technologies that foster the Plug, Play&Forget paradigm. Also partially supported by the Department of Education, Universities and Research of the Basque Government under Grant IT980-16 and the Spanish Research Council, under grant TIN2016-79897-P

Fungal Diseases in Two North-West Spain Vineyards: Relationship with Meteorological Conditions and Predictive Aerobiological Model

Grey mould, powdery mildew, and downy mildew are the most frequent fungal diseases among vineyards worldwide. In the present study, we analysed the influence of the fungi causing these diseases (Botrytis, Erysiphe, and Plasmopara, respectively) on two viticulture areas from North-western (NW) Spain during three growth seasons (2016, 2017, and 2018). The obtained results showed the predominant concentration of the Botrytis airborne spores, mainly from the beginning of the Inflorescence emerge phenological stage (S-5) until the end of the Flowering phenological stage (S-6). Erysiphe and Plasmopara airborne spore peak concentrations were more localised around Flowering (S-6) and Development of fruits (S-7) phenological stages. We applied a Spearman’s correlation test and a Principal Component Analysis to determine the influence of the meteorological parameters on the concentration of airborne spores. Taking into account the variables with the highest correlation coefficient, we developed multiple regression models to forecast the phytopathogenic fungal spore concentrations. The Botrytis model regression equation explained between 59.4–70.9% of spore concentration variability. The Erysiphe equation explained between 57.6–61% and the Plasmopara explained between 39.9–55.8%. In general, we found better prediction results for mean daily concentrations than sporadic spore peaksThe authors thank to the Xunta de Galicia (Consellería de Educación, Universidade e Formación Profesional) the financial support for the recognition as Grupo de Referencia Competitivo de Investigación (GRC GI–1809 BIOAPLIC, ED431C 2019/07), the Agrupación Estratégica de Investigación BioReDes (ED431E 2018/09), the CITACA Strategic Partnership ED431E 2018/07 (Xunta de Galicia, Spain) and the grant number AGL2014-60412-Rofthe Economy and Competence Ministry of Spain Government. González–Fernández E. is supported by the FPU Formación de Profesorado Universitario grant from Ministerio de Ciencia, Innovación y UniversidadesS

Potential Fertilization Capacity of Two Grapevine Varieties: Effects on Agricultural Production in Designation of Origin Areas in the Northwestern Iberian Peninsula

In the present study, we analyzed the main parameters related with the potential fertilization ability of two grapevine varieties, Godello and Mencía, during the years 2017 and 2018. The research was carried out in two vineyards of the Galician winegrowing Designation of Origin areas of Ribeiro and Ribeira Sacra. Ten vines of each variety were selected for bunch and flower counting, pollen calculations, pollen viability studies by means of aceto-carmine (AC) stain and 2, 3, 5-triphenyl tetrazolium chloride (TTC) methods, and the determination of their germination rate. In all vineyards the 50% fruitset was reached, except for Godello in Cenlle during 2017. The mean coulure value was higher for Godello (40.5%) than for Mencía (31%). Analyzing the pollen production per plant and airborne pollen levels, we observed important discordances between them, which can be due to the influence of weather conditions and be related with self-pollination processes. We found important differences on pollen viability depending on the applied method and variety, with higher values for the AC method than the TTC for both varieties in all study plots, and higher values for Mencía variety than Godello. Regarding germination rates, we observed a marked reduction in 2017 with respect to 2018, in all study sites and for both varieties. The analyzed parameters were useful to explain the different productive abilities of Godello and Mencía varieties in the two studied bioclimatic regions of Ribeiro and Ribeira SacraThis research was funded by the Xunta de Galicia (Consellería de Educación, Universidade e Formación Profesional) through the recognition as Grupo de Referencia Competitivo de Investigación (GRC GI-1809 BIOAPLIC “Biodiversidad y Botánica Aplicada”, ED431C 2019/07), the Agrupación Estratégica de Investigación BioReDes (ED431E 2018/09) and the BV1 Reference Competitive Research Groups ED431C 2017/62 (Xunta de Galicia, Spain). This work was partially funded by Xunta de Galicia CITACA “Cluster de Investigación y Transferencia Agroalimentaria de Campus del Agua” Strategic Partnership (Reference: ED431E 2018/07) and the AGL2014-60412-R Economy and Competence Ministry of Spain Government project. Fernández-González M. was supported by FCT “Fundação para a Ciência e a Tecnologia” (SFRH/BPD/125686/2016) through the HCOP-Human Capital Operational Program, financed by “Fundo Social Europeu” and “Fundos Nacionais do MCTES (Ministério da Ciência, Tecnologia e Ensino Superior). González-Fernández E. was supported by the Ministry of Sciences, Innovation and Universities (FPU “Ayudas para la Formación de Profesorado Universitario” grant FPU15/03343)S