REVE 2021: 9th International Workshop on Reverse Variability Engineering

Software Product Line (SPL) migration remains a challenging endeavour. From organizational issues to purely technical challenges, there is a wide range of barriers that complicates SPL adoption. This workshop aims to foster research about making the most of the two main inputs for SPL migration: 1) domain knowledge and 2) legacy assets. Domain knowledge, usually implicit and spread across an organization, is key to define the SPL scope and to validate the variability model and its semantics. At the technical level, domain expertise is also needed to create or extract the reusable software components. Legacy assets can be, for instance, similar product variants (e.g., requirements, models, source code, etc.) that were implemented using ad-hoc reuse techniques such as clone-and-own. More generally, the workshop REverse Variability Engineering attracts researchers and practitioners contributing to processes, techniques, tools, or empirical studies related to the automatic, semi-automatic or manual extraction or refinement of SPL assets

NDT to identify biological damage in wood

Nondestructive techniques are widely used to assess existing timber structures. The models proposed for these methods are usually performed in the laboratory using small clear wood specimens. But in real situations many anomalies, defects and biological damage are found in wood. In these cases the existing models only indicate that the values are outside normality without providing any other information. To solve this problem, a study of non-destructive probing methods for wood was performed, testing the behaviour of four different techniques (penetration resistance, pullout resistance, drill resistance and chip drill extraction) on wood samples with different biological damage, simulating an in-situ test. The wood samples were obtained from existing Spanish timber structures with biotic damage caused by borer insects, termites, brown rot and white rot. The study concludes that all of the methods offer more or less detailed information about the degree of deterioration of wood, but that the first two methods (penetration and pullout resistance) cannot distinguish between pathologies. On the other hand, drill resistance and chip drill extraction make it possible to differentiate pathologies and even to identify species or damage location. Finally, the techniques used were compared to characterize their advantages and disadvantages

1D and 3D supramolecular structures exhibiting weak ferromagnetism in three Cu(II) complexes based on malonato and di-alkyl-2,2’-bipyridines

Abstract Manganese coordination polymers {Mn(- fum)(5dmb)(H2O)2}n (1) and {[Mn2(fum)2(4dmb)2] H2O}n (2) (fum= fumarato; 5dmb = 5,50-dimethyl-2,20-bipyridine; 4dmb = 4,40-dimethyl-2,20-bipyridine) were obtained from one-pot, solution reactions under ambient conditions. The fum ligand acquires different coordination modes in the presence of the different dmb ancillary ligands, promoting distinctive crystal structures, including divergent dimensionalities. Thus, X-ray single-crystal data reveal that complex 1 crystallizes in a monoclinic system with C2/c space group and forms an infinite one-dimensional polymer. The Mn(II) center is six-coordinated and displays a distorted octahedral configuration. In addition, the solid-state selfassembly of the polymeric structure of 1 gives rise to a twodimensional (2D) supramolecular framework, mainly through hydrogen bonding. In contrast, complex 2 crystallizes in a monoclinic system with a Cc space group and forms an infinite 2D coordination polymer having dinuclear units. The Mn(II) center has a distorted octahedral configuration. The thermal stabilities of both coordination polymers were investigated. Variable-temperature magnetic measurements show that complex 1 is paramagnetic, while complex 2 exhibits weak antiferromagnetic coupling between adjacent Mn(II) centers.supported by CONACyT project 129293, DGAPA-UNAM project IN106014, and ICYTDF, project PICCO

Implementing a Mobile Application for Street Lighting Evaluation

Nowadays, energy consumption is on the rise. This is not sustainable in the long run. The highest energy use in Town Councils takes place in street lighting installations. In order to help in this problem, we present a mobile service to evaluate the electrical consumption of these infrastructures. This new tool is able to make an estimation of energy demand of installations; on an easy and intuitive way thanks to an evaluation methodology which reduces the need of a large list of parameters used by other programs. As a result, the developed application also gives users the opportunity to compare the efficiency of the installation evaluated with others previously evaluated to increase energy efficiency. The application was tested with two different experiments to ensure its correct running and to evaluate both the estimation accuracy and usability

The influence of sensor placement on in-situ ultrasound wave velocity measurement.

Ultrasound wave velocity was measured in 30 pieces of Spanish Scots pine (Pinus sylvestris L.), 90 x 140 mm in cross-section and 4 m long. Five different sensor placement arrangements were used: end to end (V0), face to opposite face, edge to opposite edge, face to same face and edge to same edge. The pieces were successively shortened to 3, 2 and 1 m, in order to obtain these velocities and their ratios to reference value V0 for different lengths and angles with respect to the piece axis for the crossed measurements. The velocity obtained in crossed measurements is lower than V0. A correction coefficient for crossed velocities is proposed, depending on the angle, to adjust them to the V0 benchmark. The velocities measured on a surface, are also lower than V0, and their ratio with respect to V0 is close to 0.97 for distances equal to or greater than 18 times the depth of the beam

Performance assessment of an unglazed solar thermal collector for envelope retrofitting

Present trends on solar thermal systems for building integration define the need of integrated solar technologies for façades. Although other possibilities exist for solar thermal systems in new buildings, solutions for a suitable integration of solar thermal systems into building retrofitting actuations are needed. This paper presents a solar thermal collector system which hybridizes already existing ventilated façade cladding systems into a low temperature solar thermal collector. Numerical and experimental data is presented.This work has been supported by INEF4, French institute for energetic transition, as part of project BATISOL (2014/2017)

Use of negative pressure therapy in the management of complex wounds initial experience of 4 years

Background: Wound management with negative pressure therapy has been used in the treatment of complex wounds in both inpatient and outpatient settings, and is increasingly used in primary care and outpatient management, as it helps to reduce patient days of hospital stay. We describe the initial 4-year experience in the use of negative pressure therapy in the management of complex wounds.Methods: A retrospective, cross-sectional and descriptive study of our experience of the use of negative pressure therapy for the management of complex wounds in 5 years.Results: A total of 89 patients with complex wounds managed with TPN were analysed, of which 53 were men (62.9%) and 33 were women (37.1%). Suprafacial therapy was used in 64 cases (73%). The ABTHERA® system was used in 25 cases (27%). Among the etiology of complex wounds, vulvar abscess was recorded in 1 case (1.1%), firearm wound in 1 case (1.1%), Fournier's gangrene in 1 case (1.1%), septic arthritis in 1 case (1.1%), burn wounds in 1 case (1.1%), septic arthritis in 1 case (1.1%), and burn wounds in 1 case (1.1%). 1%), burn wounds in 5 cases (5.6%), pressure ulcer wound in 6 cases (6.7%), necrotizing fasciitis in 19 cases (21.3%), abdominal sepsis in 26 cases (29.2%), surgical wound infection in 29 cases (32.5%).Conclusions: The use of negative pressure therapy and protocolized management has provided patients in our institution with a viable therapeutic option

Análisis de diseño a partir de la lectura de dos periódicos en línea, El Universal y La Jornada, mediante el empleo de eye tracking. Segundo experimento

El registro de los movimientos oculares o eye tracking de un individuo, durante la navegación en un diario en línea, proporciona información cuantitativa y objetiva sobre dicho comportamiento. Cabe aclarar que los datos aquí presentados corresponden a un segundo experimento del proyecto en el que se analizaron, con esta tecnología, los mismos portales periodísticos: La Jornada y El Universal, a un año de distancia de los resultados obtenidos en el primer experimento, con un grupo muestra con características y número de participantes distinto del primero. A pesar de las diferencias entre los diarios seleccionados en cuanto a la complejidad, extensión, proliferación de banners publicitarios animados y video, entre otros aspectos, los resultados de este segundo experimento mostraron que no existe una diferencia marcada en la experiencia de usuario durante la navegación de las páginas mencionadas. Sin embargo, es importante resaltar que los participantes declararon preferir la interfaz de La Jornada a la de El Universal. En ambos casos, los constantes estímulos visuales y la deficiente organización de los contenidos, impidieron la fácil localización de la información solicitada, entorpeciendo los procesos cognitivos

Facility ownership and mortality among older adults residing in care homes

BACKGROUND AND OBJECTIVES: Nursing or care home characteristics may have a long-term impact on the residents' mortality risks that has not been studied previously. The study's main objective was to assess the association between facility ownership and long-term, all-cause mortality. RESEARCH DESIGN AND METHODS: We conducted a mortality follow-up study on a cohort of 611 nursing-home residents in the city Madrid, Spain, from their 1998-1999 baseline interviews up to September 2013. Residents lived in three types of facilities: public, subsidized and private, which were also sub-classified according to size (number of beds). Residents' information was collected by interviewing the residents themselves, their caregivers and facility physicians. We used time-to-event multivariable models and inverse probability weighting to estimate standardized mortality risk differences. RESULTS: After a 3728 person-year follow-up (median/maximum of 4.8/15.2 years), 519 participants had died. In fully-adjusted models, the standardized mortality risk difference at 5 years of follow-up between medium-sized private facilities and large-sized public facilities was -18.9% (95% confidence interval [CI]: -33.4 to -4.5%), with a median survival (95% CI) of 3.6 (0.5 to 6.8) additional years. The fully-standardized 5-year mortality difference (95% CIs) between for-profit private facilities and not-for-profit public institutions was -15.1% (-31.1% to 0.9%), and the fully-standardized median survival difference (95% CIs) was 3.0 (-1.7 to 7.7) years. DISCUSSION AND IMPLICATIONS: These results are compatible with an association between factors related with the ownership of facilities and the long-term mortality risk of their residents. One of these factors, the facility size, could partly explain this association.This work was supported by the Carlos III Institute of Health [PI15CIII00037] to JD. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.S

Modelización espacial de trips (insecta: thysanoptera) en el cultivo de aguacate (persea americana)

SE LOGRÓ ESTABLECER MEDIANTE MODELIZACIÓN ESPACIAL LA DISTRIBUCIÓN DE LAS POBLACIONES DE TRIPS EN AGUACATE EN EL ESTADO DE MÉXICO.México es el principal productor y exportador de aguacate en el mundo. Los trips son considerados una de las principales plagas de este cultivo, ya que se alimentan del fruto pequeño y forman crestas o protuberancias, las cuales al crecer el fruto son más visibles, y este pierde valor económico. Además de este daño, las heridas causadas por los trips son el principal causante para que entre la enfermedad denominada roña de fruto. Las alternativas de control de los trips han carecido de eficacia debido, entre otras causas, a que se desconoce su distribución espacial dentro de las huertas de aguacate. Este trabajo tuvo por objetivo determinar la distribución espacial de las poblaciones de trips en aguacate mediante el uso de técnicas de estadística espacial que condujeron a la generación de mapas por medio del “krigeado”. Los resultados demostraron que las poblaciones de trips presentan una distribución de tipo agregada, que fue corroborada por los mapas de densidad. Las infestaciones se distribuyeron en el 100 % de la superficie de las dos parcelas experimentales, lo cual resulta interesante para dirigir las medidas de control sobre áreas específicas de infestación. Se logró determinar estabilidad espacial y temporal a corto plazo de las poblaciones de trips