47 documents found, page 1 of 5
On the hyperbolicity of the Krein space numerical range
Bebiano, N.; Lemos, R.; Soares, G.In this paper a necessary and sufficient condition for hyperbolicity of the indefinite numerical range is established. As a consequence, an indefinite version of Brown–Spitkovsky theorem stating the ellipticity of the numerical range of certain tridiagonal matrices is revisited. This result leads to necessary and sufficient conditions for hyperbolicity of indefinite numerical ranges of new classes of tridiagona...
The SHiP experiment at the proposed CERN SPS Beam Dump Facility
Ahdida, C.; Akmete, A.; Albanese, R.; Alt, J.; Alexandrov, A.; Anokhina, A.; Aoki, S.; Arduini, G.; Atkin, E.; Azorskiy, N.; Back, J. J.; Bagulya, A.
Log-majorization type inequalities
Lemos, R.; Bebiano, N.; Soares, G.Several inequalities have been established in the context of Hilbert spaces operators or operator algebras. Our discussion will be limited to matrices. Important inequalities in mathematics and other sciences, such as Golden-Thompson inequality or von Neumann trace inequality, and extensions, are revisited. Our main goal is to emphasize the link between majorization theory and other relevant inequalities.
Cloud-based implementation of a SON radio resources planning system for mobile ...
Cortesão, R.; Fernandes, D.; Soares, G.; Clemente, D.; Sebastião, P.; Ferreira, L. S.In mobile network deployments of growing size, the optimum and fast planning of radio resources are a key task. Cloud services enable efficient and scalable implementation of procedures and algorithms. In this paper, a proof of concept implementation of a cloud-based network planning work pattern using Amazon Web Services (AWS) is presented, containing new and efficient radio resource planning algorithms for 3G...
Automatic coverage based neighbour estimation system: a cloud-based implementation
Pina, P. M.; Godinho, A. F.; Fernandes, D.; Clemente, D.; Sebastião, P.; Soares, G.; Ferreira, L. S.Over the years, mobile networks have grown exponentially due to rising demand. These networks mix different types of cells, which makes manual configuration difficult, costly and tedious. Furthermore, inefficiencies stemming from these problems can cause problems in Handover performance, since a mobile device may not always connect to the optimal cell upon switching from one to the other, potentially harming se...
A novel way to automatically plan cellular networks supported by linear program...
Godinho, A.; Fernandes, D.; Soares, G.; Pina, P.; Sebastião, P.; Correia, A.; Ferreira, L. S.With the increasing number of mobile subscribers worldwide, there is a need for fast and reliable algorithms for planning/optimization of mobile networks, especially because, in order to maintain a network’s quality of service, an operator might need to deploy more equipment. This paper presents a quick and reliable way to automatically plan a set of frequencies in a cellular network, using both cloud technolog...
Cloud-based implementation of an automatic coverage estimation methodology for ...
Fernandes, D.; Clemente, D.; Soares, G.; Sebastião, P.; Cercas, F.; Dinis, R.; Ferreira, L. S.One of the main concerns of telecommunications operators are related to the network coverage. A weak coverage can lead to a decrease, not only in the user experience when using the operators’ services such as multimedia streaming, but also decreases the overall Quality of Service. This paper presents a novel cloud-based framework of a semi-empirical propagation model that estimates the coverage in a precise way...
The Role of AKT3 Copy Number Changes in Brain Abnormalities and Neurodevelopmen...
Lopes, F.; Torres, F.; Soares, G.; van Karnebeek, C.; Martins, C.; Antunes, D.; Silva, J.; Muttucomaroe, L.; Botelho, L.; Sousa, S.; Rendeiro, P.Microdeletions at 1q43-q44 have been described as resulting in a clinically recognizable phenotype of intellectual disability (ID), facial dysmorphisms and microcephaly (MIC). In contrast, the reciprocal microduplications of 1q43-q44 region have been less frequently reported and patients showed a variable phenotype, including macrocephaly. Reports of a large number of patients with copy number variations involv...
Subtelomeric Rearrangements: Presentation of 21 Probands with Emphasis on Famil...
Soares, A.; Soares, G.; Mota-Freitas, M.; Oliva-Teles, N.; Fortuna, A.Intellectual disability affects 2% - 3% of the general population, with a chromosomal abnormality being found in 4% - 28% of these patients and a cryptic subtelomeric abnormality in 3% - 16%. In most cases, these subtelomeric rearrangements are submicroscopic, requiring techniques other than conventional karyotype for detection. They may be de novo or inherited from an affected parent or from a healthy carrier ...
Identification of rare de novo epigenetic variations in congenital disorders
Barbosa, M.; Joshi, R.; Garg, P.; Martin-Trujillo, A.; Patel, N.; Jadhav, B.; Watson, C.; Gibson, W.; Chetnik, K.; Tessereau, C.; Mei, H.; De Rubeis, S.Certain human traits such as neurodevelopmental disorders (NDs) and congenital anomalies (CAs) are believed to be primarily genetic in origin. However, even after whole-genome sequencing (WGS), a substantial fraction of such disorders remain unexplained. We hypothesize that some cases of ND-CA are caused by aberrant DNA methylation leading to dysregulated genome function. Comparing DNA methylation profiles from...