Selection of Software Product Line Implementation Components Using Recommender Systems: An Application to Wordpress

In software products line (SPL), there may be features which can be implemented by different components, which means there are several implementations for the same feature. In this context, the selection of the best components set to implement a given configuration is a challenging task due to the high number of combinations and options which could be selected. In certain scenarios, it is possible to find information associated with the components which could help in this selection task, such as user ratings. In this paper, we introduce a component-based recommender system, called (REcommender System that suggests implementation Components from selecteD fEatures), which uses information associated with the implementation components to make recommendations in the domain of the SPL configuration. We also provide a RESDEC reference implementation that supports collaborative-based and content-based filtering algorithms to recommend (i.e., implementation components) regarding WordPress-based websites configuration. The empirical results, on a knowledge base with 680 plugins and 187 000 ratings by 116 000 users, show promising results. Concretely, this indicates that it is possible to guide the user throughout the implementation components selection with a margin of error smaller than 13% according to our evaluation.Ministerio de Economía y Competitividad RTI2018-101204-B-C22Ministerio de Economía y Competitividad TIN2014-55894-C2-1-RMinisterio de Economía y Competitividad TIN2017-88209-C2-2-RMinisterio de Economía, Industria y Competitividad MCIU-AEI TIN2017-90644-RED

Pseudocompact group topologies with prescribed topological subspaces

We prove that every pseudocompact topological Abelian group G admits a pseudocompact topological group topology with a non-trivial convergent sequence. Imposing some restrictions on the properties of G, stronger properties are also obtained. If, for instance, G is an Abelian group with m(β) ≤ r0(G) ≤ |G| ≤ 2β (see the Introduction below for unexplained terminology) for some uncountable cardinal β, and X is any topological space with |X| ≤ r0(G) and w(X) ≤ β, then G admits a pseudocompact topological group topology that contains X as a subspace. If, on the other direction, G is a torsion Abelian group that admits a pseudocompact group topology, then, for every sequence (an)n∈ of G there exists a pseudocompact group topology on G for which some subsequence of (an)n∈ converges

Numerical and experimental analysis of automotive turbocharger compressor aeroacoustics at different operating conditions

Centrifugal compressor aeroacoustics are analyzed by means of a three-dimensional CFD model. Three operating points at nominal compressor speed are simulated ranging from best efficiency point to near-surge conditions. Experimental measurements are obtained using a steady flow rig mounted on an anechoic chamber. URANS and DES predictions of compressor global variables and pressure spectra are compared against experimental measurements. Flow-induced noise increases as the operating point moves toward surge line. Stall at the suction side of the blades exists even for high mass flow conditions, causing a high frequency boundary layer oscillation. Low momentum cells rotating at the diffuser are found at points closer to surge, causing the so-called whoosh noise. Inducer rotating stall is also present at these conditions. Point closest to surge shows a rotating tornado-type vortex at the inducer, determining a moving low pressure region that increases low frequency noise content.The equipment used in this work has been partially supported by the Spanish Ministerio de Economia y Competitividad through grant no. TRA2012-36954 and by FEDER project funds "Dotacion de infraestructuras cientifico tecnicas para el Centro Integral de Mejora Energetica y Medioambiental de Sistemas de Transporte (CiMeT), (FEDER-ICTS-2012-06)" framed in the operational program of unique scientific and technical infrastructure of the Spanish Ministerio de Economia y Competitividad. Part of the computational resources used in this work have been provided by Super computing Center of Universitat Politecnica de Valencia and are thus gratefully acknowledged.Broatch Meza, A.; Galindo, J.; Navarro García, R.; García Tíscar, J. (2016). Numerical and experimental analysis of automotive turbocharger compressor aeroacoustics at different operating conditions. International Journal of Heat and Fluid Flow. 61B:245-255. https://doi.org/10.1016/j.ijheatfluidflow.2016.04.003S24525561

RESDEC: Online Management Tool for Implementation Components Selection in Software Product Lines Using Recommender Systems

Software product lines (SPL) management is one of the most im portant activities for the software engineer and it represents one of the key pieces of software product line engineering. When a software system grow fast, configuring a product becomes a costly and error-prone activity due to the amount of features available for configuration. This process becomes more complex when for each feature, there is more than one component that implements it. Currently the tools available for configuration management do not have automated mechanisms to facilitate the optimal components selection that meet the functions required by a given product. In this paper, we introduce a prototype component-based recommender system called RESDEC (REcommender System that suggest imple mentation Components from selecteD fEatures) designed to manage the best implementation components alternatives. Our tool is vali dated using WordPress-based websites where the implementation components are represented by plugins and the recommendations generated by RESDEC help interested parties in the search and efficient plugins selection to configure websites

Electrophoretic fingerprinting of benzodiazepine tablets in spike drinks

Over the last few years, there has been an increase in the reports of drug-facilitated crimes. The list of drugs associated with these crimes is extensive and benzodiazepines constitute one of the groups of substances more commonly used. The sedative properties, which characterize benzodiazepines, are enhanced when such drugs are combined with alcohol, being more attractive for committing these types of crimes. In this work, a capillary electrophoresis method was applied to the analysis of 63 different samples of club drinks spiked with benzodiazepine tablets. The resulting electropherograms were processed and analyzed with the chemometric multivariate techniques: principal component analysis (PCA) and soft independent modeling of class analogies (SIMCA) classification. The PCA results allowed a clear differentiation of each drug class in a 3D plot. In addition, the SIMCA classification model (5% significance level) showed that eight out of nine test samples were automatically assigned by software to their proper sample class. The conflicting sample was correctly classified in the Coomans? plot (95% confidence). This novel approach based on the comparison of electrophoretic profiles of spiked drinks by chemometric tools allows determining the benzodiazepine used for drink spiking without the use of drug standards.Moreover, it provides an opportunity for the forensic laboratories to incorporate the identification capability provided by the electrophoretic fingerprinting of benzodiazepine solutions in existing or new databases

The legacy of Félix Candela in Colombia through six unpublished projects

Este artículo explica los seis proyectos que el arquitecto Félix Candela, a través de su empresa Cubiertas Ala, realizó en la ciudad de Cali (Colombia), entre 1958 y 1961, asociado con arquitectos locales. La primera parte presenta los antecedentes colombianos en la construcción de bóvedas de membrana ejecutadas principalmente en cerámica armada. La segunda parte explica la manera en que Candela entró en contacto con arquitectos e ingenieros colombianos y describe detalladamente los seis proyectos que son objeto central del artículo a partir de sus características tipológicas y constructivas. Por último, se da cuenta de la influencia que estos diseños ejercieron en la tradición local, promoviendo un uso más generalizado del hormigón armado e impulsando una búsqueda formal en el campo de las estructuras laminares adaptables a las condiciones del lugar.Palabras clave: estructura laminar, paraboloide hiperbólico, hormigón armado, estructura ligera.This article details the six projects that the architect Félix Candela, through his company Cubiertas Ala, carried out in the city of Cali (Colombia) between 1958 and 1961 in association with local architects. The first part presents Colombian precedents in the construction of membrane vaults executed mainly in reinforced ceramic. The second part explains how Candela met Colombian architects and engineers and details the six projects that are the focus of this article based on their typological and constructive characteristics. Finally, an analysis is done on the influence these designs had on local tradition, promoting a more generalized use of reinforced concrete and promoting a formal search in the field of laminar structures adaptable to the conditions of the place.Keywords: thin shell, hyperbolic paraboloid, reinforced concrete, lightweight structure

A new species of Torrestrongylus (Trichostrongylidae, Anoplostrongylinae) from Macrotus waterhousii (Chiroptera: Phyllostomidae) in Central Mexico

A new species of nematode, Torrestrongylus tetradorsalis n. sp., is described herein, based on specimens recovered from the small intestine of the leaf-nosed bat, Macrotus waterhousii, from the Biosphere Reserve “Sierra de Huautla” in the state of Morelos, Mexico. The new species is included in Torrestrongylus because it features a bursa of the type 3 – 2, a divided cephalic vesicle with an anterior half in the shape of an umbrella, and a posterior widened half. The new species can be distinguished from the only other congener T. torrei Pérez-Vigueras, 1935 by four key features: first, by the absence of cervical alae in both males and females; second, by the relatively longer second half of the cephalic cap; third, by the configuration of the dorsal ray, that does not have a medial terminal ray, and finally, by the structure of the spicules. This is the second species in the genus, previously known from bats of the families Phyllostomidae and Molossidae in Cuba, and now in Mexico

Deforestation impacts on bat functional diversity in tropical landscapes

"Functional diversity is the variability in the functional roles carried out by species within ecosystems. Changes in the environment can affect this component of biodiversity and can, in turn, affect different processes, including some ecosystem services. This study aimed to determine the effect of forest loss on species richness, abundance and functional diversity of Neotropical bats. To this end, we identified six landscapes with increasing loss of forest cover in the Huasteca region of the state of Hidalgo, Mexico. We captured bats in each landscape using mist nets, and calculated functional diversity indices (functional richness and functional evenness) along with species richness and abundance. We analyzed these measures in terms of percent forest cover. We captured 906 bats (Phyllostomidae and Mormoopidae), including 10 genera and 12 species. Species richness, abundance and functional richness per night are positively related with forest cover. Generalized linear models show that species richness, abundance and functional richness per night are significantly related with forest cover, while seasonality had an effect on abundance and functional richness. Neither forest cover nor season had a significant effect on functional evenness. All these findings were consistent across three spatial scales (1, 3 and 5 km radius around sampling sites). The decrease in species, abundance and functional richness of bats with forest loss may have implications for the ecological processes they carry out such as seed dispersal, pollination and insect predation, among others.

Paralarvas y juveniles de cefalópodos en el Pacífico sur de México

Early life cephalopod stages are poorly studied and inadequately described. This study presents for the first time the composition of species, patterns of distribution, and abundance of parlarvae and juveniles of cephalopods in the Gulf of Tehuantepec, a highly productive and ecologically complex region. Paralarvae and juvenile were recovered from zooplancton samples collected with bongo tows (10-15 °N, 96-100 °O) on board of the O/V El Puma during June and September 2001. A third set of samples were obtained on board the B/P UMAR in November 2001 (14-16 °N, 93-97 °O) with a CalCOFI net. Average density of cephalopods was 16.2 organisms x 1000 m-3. Six families representing eight genera and at least 13 species were identified. The most abundant families were: Octopodidae (48.5% of specimens examined), Enoploteuthidae (15.9%), Argonautidae (13.3%), Ommastrephidae (11.5%), Onychoteuthidae (6.7%), and Cranchiidae (4.1%). The results revealed a typical tropical and oceanic cephalopod assemblage. The mantle length (ML) ranged between 0.2 and 37.8 mm; most specimens (90%) were small-sized, measuring less than 3 mm ML. The main genera and species are illustrated and their meso-scale distribution patterns are discussed. Results provide new information on the presence and relative abundance of tropical species in this region of the Eastern Pacific.Los primeros estadios de vida de la mayoría de las especies de cefalópodos se encuentran pobremente estudiados e inadecuadamente descritos. En este trabajo se presenta por primera vez la composición de especies, patrones de distribución y abundancia de paralarvas y juveniles de cefalópodos en el Golfo de Tehuantepec, en el Pacífico sur de México. Esta es una región altamente productiva y de gran complejidad ecológica. Los especímenes examinados provinieron de muestras de zooplancton recolectadas con redes Bongo (10-15 °N, 96-100 °O) a bordo del B/O El Puma durante junio y septiembre de 2001 y de un tercer muestreo a bordo del B/P UMAR, noviembre 2001 (14-16 °N, 93-97 °O) con red tipo CalCOFI. La abundancia promedio fue de 16.2 individuos x 1000 m-3. Se identificaron seis familias, que comprenden ocho géneros y por lo menos 13 especies. En orden de abundancia las familias fueron Octopodidae (48.5% de los especímenes analizados), Enoploteuthidae (15.9%), Argonautidae (13.3%), Ommastrephidae (11.5%), Onychoteuthidae (6.7%) y Cranchiidae (4.1%). Los resultados mostraron un ensamble de cefalópodos típico de aguas tropicales y oceánicas. La talla osciló entre 0.2 y 37.8 mm de longitud de manto (LM); el 90% de los organismos presentó tallas menores a 3 mm LM. Se presentan ilustraciones de los principales géneros y especies y se discuten sus patrones de distribución a meso-escala. Los resultados ofrecen nueva información sobre la presencia y abundancia relativa de especies tropicales en esta región del Pacífico Oriental

Accumulation of scandium in plasma in patients with chronic renal failure

Scandium (Sc) is an element with many industrial applications, but relatively little is known about its physiological and/or toxicological effects, and very little data are available concerning the role of Sc in chronic renal failure (CRF). This paper examines the changes in plasma levels of Sc in predialysis patients with CRF and the relationship with blood parameters. The participants in this trial were 48 patients with CRF in predialysis and 53 healthy controls. Erythrocyte, haemoglobin, and haematocrit counts in blood were determined, and levels of creatinine, urea, uric acid, albumin, total protein and Sc were measured in plasma. The glomerular filtration rate (GFR) was calculated using the Cockcroft-Gault index. The CRF patients were found to have higher plasma levels of creatinine, urea, uric acid, albumin, total protein, and Sc and a lower GFR than that the controls. Scandium in plasma was positively correlated with creatinine and plasma urea and negatively correlated with GFR, haemoglobin, and haematocrit and was associated with the risk of lower levels of erythrocytes, haemoglobin, and haematocrit. CRF was associated with increases in the circulating levels of scandium.This research was supported by Plan Nacional I+D Project 1FD 1997-0642