RDF-TR: Exploiting structural redundancies to boost RDF compression

The number and volume of semantic data have grown impressively over the last decade, promoting compression as an essential tool for RDF preservation, sharing and management. In contrast to universal compressors, RDF compression techniques are able to detect and exploit specific forms of redundancy in RDF data. Thus, state-of-the-art RDF compressors excel at exploiting syntactic and semantic redundancies, i.e., repetitions in the serialization format and information that can be inferred implicitly. However, little attention has been paid to the existence of structural patterns within the RDF dataset; i.e. structural redundancy. In this paper, we analyze structural regularities in real-world datasets, and show three schema-based sources of redundancies that underpin the schema-relaxed nature of RDF. Then, we propose RDF-Tr (RDF Triples Reorganizer), a preprocessing technique that discovers and removes this kind of redundancy before the RDF dataset is effectively compressed. In particular, RDF-Tr groups subjects that are described by the same predicates, and locally re-codes the objects related to these predicates. Finally, we integrate RDF-Tr with two RDF compressors, HDT and k2-triples. Our experiments show that using RDF-Tr with these compressors improves by up to 2.3 times their original effectiveness, outperforming the most prominent state-of-the-art techniques

On the void explanation of the Cold Spot

The integrated Sachs-Wolfe (ISW) contribution induced on the cosmic microwave background by the presence of a supervoid as the one detected by Szapudi et al. (2015) is reviewed in this letter in order to check whether it could explain the Cold Spot (CS) anomaly. Two different models, previously used for the same purpose, are considered to describe the matter density profile of the void: a top hat function and a compensated profile produced by a Gaussian potential. The analysis shows that, even enabling ellipticity changes or different values for the dark-energy equation of state parameter $\omega$, the ISW contribution due to the presence of the void does not reproduce the properties of the CS. Finally, the probability of alignment between the void and the CS is also questioned as an argument in favor of a physical connection between these two phenomena

Van der Waals spin valves

We propose spin valves where a 2D non-magnetic conductor is intercalated between two ferromagnetic insulating layers. In this setup, the relative orientation of the magnetizations of the insulating layers can have a strong impact on the in-plane conductivity of the 2D conductor. We first show this for a graphene bilayer, described with a tight-binding model, placed between two ferromagnetic insulators. In the anti-parallel configuration, a band gap opens at the Dirac point, whereas in the parallel configuration, the graphene bilayer remains conducting. We then compute the electronic structure of graphene bilayer placed between two monolayers of the ferromagnetic insulator CrI$_3$, using density functional theory. Consistent with the model, we find that a gap opens at the Dirac point only in the antiparallel configuration.Comment: 5 pages, 4 figure

Epigenetic prediction of response to anti-PD-1 treatment in non-small-cell lung cancer: a multicentre, retrospective analysis

The research leading to these results received funding from the Obra Social “la Caixa” (to ME), the Cellex Foundation (to ME), the European Union's Horizon 2020 research and innovation programme under grant agreement No 727264 Epipharm (to ME), the 2015 Endowment fund for Research into Respiratory Health (“Fonds de Dotation Recherche en Santé Respiratoire”; to MD), the “Fondation ARC pour la recherche sur le cancer - Aide individuelle” (to MD), the Spanish Association Against Cancer (to VD), the Pla Estratègic de Recerca i Innovació en Salut (to SM), the Fondo de Investigación Sanitaria-Fondo Europeo de Desarrollo Regional (PI16/01821 to LMM and PI15/02223, to IG-B), RETTICS grant (RD12/0036/0040 to IG-B), Fundación Merck Salud (to IG-B), Departamento de Salud, Gobierno de Navarra (074-2017, to IGB), the European Commission MSCA IMMUNOMARK-799818 (to IBara), the China Scholarship Council and Karolinska Institutet Fonder (to QX), and the Health and Science Departments of the Generalitat de Catalunya (to ME). We thank IGTP–HUGTP Biobank (PT13/0010/0009) University Hospital Ramon y Cajal-IRYCIS Biobank (PT13/0010/0002), members of the Spanish National Biobanks Network of the Instituto de Salud Carlos III, Andalusia Public Health System Biobank, the Biological Resource Center of the Hospices Civils de Lyon (Tissu-tumorothèque Est), and the Tumor Bank Network of Catalonia for their help with the collection of samples.Duruisseaux, M., Martínez-Cardús, A., Calleja-Cervantes, M.E., Moran, S., Castro de Moura, M. , Davalos, V., Piñeyro, D., Sanchez-Cespedes, M., Girard, N., Brevet, M.,Giroux-Leprieur, E., Dumenil, C. Pradotto, M., Bironzo, P., Capelletto, E., Novello, S., Cortot, A. , Copin, M.-C., Karachaliou, N.,Gonzalez-Cao, M. ,Peralta, S., Montuenga, L.M.,Gil-Bazo, I. ,Baraibar, I.,Lozano, M.D., Varela, M. ,Ruffinelli, J.C.,Palmero, R., Nadal, E.,Moran, T., Perez, L., Ramos, I., Xiao, Q.,Fernandez, A.F., Fraga, M.F.,Gut, M., Gut, I. ,Teixidó, C. , Vilariño, N., Prat, A., Reguart, N., Benito, A.,Garrido, P., Barragan, I., Emile, J.-F., Rosell, R., Brambilla, E., Esteller, M