Noise Folding in Compressed Sensing

The literature on compressed sensing has focused almost entirely on settings where the signal is noiseless and the measurements are contaminated by noise. In practice, however, the signal itself is often subject to random noise prior to measurement. We briefly study this setting and show that, for the vast majority of measurement schemes employed in compressed sensing, the two models are equivalent with the important difference that the signal-to-noise ratio is divided by a factor proportional to p/n, where p is the dimension of the signal and n is the number of observations. Since p/n is often large, this leads to noise folding which can have a severe impact on the SNR

Análisis de la relación entre creatividad, atención y rendimiento escolar en niños y niñas de más de 9 años en Colombia (Analysis of the relationship between creativity, attention and school performance in children and girls over 9 years in Colombia)

Resumen:  Objetivo: El presente artículo de resultados de investigación se llevó a cabo en el marco de la neuropsicología aplicada a la educación. Objetivo: Analizar la relación entre la creatividad, atención visual y auditiva y el rendimiento escolar. Método: Es un estudio de tipo cuantitativo, no experimental y Correlacional; la muestra estuvo conformada por 85 niños y niñas escolarizados, con edad igual o mayor a 9 años y que se encontraran cursando entre cuarto y sexto grado académico. La atención fue evaluada con las subpruebas del dominio de atención, de la batería ENI, correspondientes a atención auditiva y visual, la creatividad a través del test CREA, y el rendimiento académico fue suministrado por la institución educativa por medio del boletín de calificaciones. Resultados: No puntuaron una relación estadísticamente significativa entre la atención y el rendimiento académico, asimismo con la creatividad, difiriendo los hallazgos de León (2008), quien propone los procesos atencionales como predictores del rendimiento académico y de igual manera, los de Corbalán, Martínez, Donolo, Alonso, Tejerina y Limiñana (2003), quienes manifiestan que la inteligencia creativa influye en el procesamiento de información y aprendizaje y, como consecuencia, en el rendimiento; sin embargo, estos resultados pueden obedecer a diferentes variables asociadas al desempeño escolar. Conclusiones: El presente estudio puede ser una vía importante para el reconocimiento del valor de la atención en los procesos creativos. Además, sugiere la realización de estudios más amplios y centrados en la relación entre la creatividad y el rendimiento para esclarecer más el tipo de relación que tienen. Abstract:  Objective:This research paper was conducted based on neuropsychology criteria applied to education.  This research aims to analyze the relationship between creativity, attention (visual and auditory attention) and school performance. Method: It is a quantitative, experimental and correlational study. For data collection, 85 school children, aged 9 years or more, fourth and sixth grade students were sampled. In order to assess auditory and visual attention, subtests related to attention domain, through ENI battery was used; also, creativity was assessed through CREA test, and the academic performance was based on scores reports supplied by the educational institution. Results: statistically, there were no a significant relationship between attention and academic performance, as well as creativity, differing in this way from Leon findings (2008), who proposes attention processes as academic performance predictors and also, from those ones such as: Corbalán, Martinez, Donolo, Alonso, Tejerina and Limiñana (2003), who consider that information and learning process are influenced by creative intelligence; however, these results may obey different variables associated with school performance. Conclusion: This study may be an important tool in order to recognize the value of the attention and creative processes. Also, it suggests broader studies focus on the relationship between creativity and academic performance

lp-Recovery of the Most Significant Subspace among Multiple Subspaces with Outliers

We assume data sampled from a mixture of d-dimensional linear subspaces with spherically symmetric distributions within each subspace and an additional outlier component with spherically symmetric distribution within the ambient space (for simplicity we may assume that all distributions are uniform on their corresponding unit spheres). We also assume mixture weights for the different components. We say that one of the underlying subspaces of the model is most significant if its mixture weight is higher than the sum of the mixture weights of all other subspaces. We study the recovery of the most significant subspace by minimizing the lp-averaged distances of data points from d-dimensional subspaces, where p>0. Unlike other lp minimization problems, this minimization is non-convex for all p>0 and thus requires different methods for its analysis. We show that if 0<p<=1, then for any fraction of outliers the most significant subspace can be recovered by lp minimization with overwhelming probability (which depends on the generating distribution and its parameters). We show that when adding small noise around the underlying subspaces the most significant subspace can be nearly recovered by lp minimization for any 0<p<=1 with an error proportional to the noise level. On the other hand, if p>1 and there is more than one underlying subspace, then with overwhelming probability the most significant subspace cannot be recovered or nearly recovered. This last result does not require spherically symmetric outliers.Comment: This is a revised version of the part of 1002.1994 that deals with single subspace recovery. V3: Improved estimates (in particular for Lemma 3.1 and for estimates relying on it), asymptotic dependence of probabilities and constants on D and d and further clarifications; for simplicity it assumes uniform distributions on spheres. V4: minor revision for the published versio

Calidad de vida y función sexual en mujeres con disfunción del piso-pélvico del sur de Chile

Antecedentes/Objetivos: La disfunción del piso pélvico (DPP) es muy prevalente, afectando a un tercio de las mujeres adultas. Estas patologías no suponen un riesgo vital, pero sus síntomas pueden interferir con las actividades de la vida diaria incluyendo aspectos físicos, sociales y sexuales. En el sur de Chile, en el Hospital de alta complejidad (Regional-Concepción), se ha implementado la Unidad de Piso Pélvico (UPP). No hay evidencia sobre el efecto que supone en la calidad de vida y la función sexual de las mujeres que la padecen Describir la calidad de vida y función sexual de mujeres controladas en la Unidad de Piso Pélvico de un Hospital de alta complejidad en Chile. Métodos: Estudio transversal. Población: usuarias con DPP de la UPP del H. Regional-Concepción. Muestra 173. Variables: Caract. sociodemográficas, antecedentes obstétricos, tipo de DPP, Variables de Calidad de Vida (percepción del estado de salud, limitación emocional, limitación de actividades cotidianas, alteraciones de actividades sociales) (Short Form-12 Health Survey) y función sexual (PISQ-12). Análisis: medidas de dispersión, frecuencia absoluta- relativa. Resultados: Edad media 57 años, 88% con ingreso menor a 357€. 91% con IMC-sobrepeso y obesidad, 64% ≥ 3 hijos. Tipos DPP: 53% incontinencia de orina (IO), 35% prolapso vaginal (Pp), 12% IO+Pp. Calidad de vida (n = 173): Mala percepción de salud: 95%. Limitación emocional: 37%. Limitación de actividades cotidianas: 67%. Alteraciones de actividades sociales: 57% Función sexual (n = 95): Disfunción alta: 8,4%, moderada: 41,1%, baja 50,5%. El 15% nunca tuvo deseo-sexual los últimos 6 meses. El 14% admite no haber alcanzado el orgasmo en los últimos 6 meses, el mismo porcentaje admite no sentir excitación en el mismo período. El 19% admite no estar satisfechas con las actividades sexuales actuales, el 15% siente dolor durante las relaciones sexuales, el 40% admite sufrir de pérdidas de orina durante la actividad sexual, y el mismo número admite restringir su vida sexual debido al miedo de pérdida de orina durante el acto sexual. El 27% admite tener reacciones emocionales negativas durante las relaciones sexuales. El 10% y el 13% admite que sus parejas sufrían de disfunción eréctil y eyaculación, respectivamente. Por último, el 42% de las mujeres admite que sus orgasmos en los últimos 6 meses son más intensos. Conclusiones: Las mujeres con DPP presentan una alteración negativa de su calidad de vida y de su función sexual, aunque existe cierta incongruencia al valorar positivamente la calidad de los orgasmos cuando los demás aspectos de la vida sexual son negativos

Multiplexed vortex beam-based optical tweezers

The design and implementation of a multiplexed spiral phase mask in an experimental optical tweezer setup are presented. This diffractive optical element allows the generation of multiple concentric vortex beams with independent topological charges. The generalization of the phase mask for multiple concentric vortices is also shown. The design for a phase mask of two multiplexed vortices with different topological charges is developed. We experimentally show the transfer of angular momentum to the optically trapped microparticles by enabling orbiting dynamics around the optical axis independently within each vortex. The angular velocity of the confined particles versus the optical power in the focal region is also discussed for different combinations of topological charges

Accuracy of single molecular biomarkers in gingival crevicular fluid for the diagnosis of periodontitis: A systematic review and meta-analysis

This is the peer reviewed version of the following article: Arias‐Bujanda, N, Regueira‐Iglesias, A, Balsa‐Castro, C, Nibali, L, Donos, N, Tomás, I. Accuracy of single molecular biomarkers in gingival crevicular fluid for the diagnosis of periodontitis: A systematic review and meta‐analysis. J Clin Periodontol. 2019; 46: 1166– 1182. https://doi.org/10.1111/jcpe.13188, which has been published in final form at https://doi.org/10.1111/jcpe.13188. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived VersionsAbstract Aim To analyse, by means of a meta‐analytical approach, the diagnostic accuracy of molecular biomarkers in gingival crevicular fluid (GCF) for the detection of periodontitis in systemically healthy subjects. Material and Methods Studies on GCF molecular biomarkers providing a binary classification table (or sensitivity and specificity values and group sample sizes) in individuals with clinically diagnosed periodontitis were considered eligible. The search was performed using six electronic databases. The methodological quality of studies was assessed through the tool Quality Assessment of Diagnostic Studies. Meta‐analyses were performed using the Hierarchical Summary Receiver Operating Characteristic, which adjusts classification data using random effects logistic regression. Results The included papers identified 36 potential biomarkers for the detection of periodontitis and for four of them meta‐analyses were performed. The median sensitivity and specificity were for MMP8, 76.7% and 92.0%; for elastase, 74.6% and 81.1%; for cathepsin, 72.8% and 67.3%, respectively. The worst estimates of sensitivity and specificity were for trypsin (71.3% and 66.1%, respectively). Conclusions MMP8 showed good sensitivity and excellent specificity, which resulted in this biomarker being clinically the most useful or effective for the diagnosis of periodontitis in systemically healthy subjects, regardless of smoking conditionInstituto de Salud Carlos III FEDER. Grant Number: ISCIII/PI17/01722 Consellería de Cultura, Educación e Ordenación Universitaria da Xunta de Galicia. Grant Numbers: ED431B 2017/029, ED481A‐201

ICA H 556 híbrido precoz de maíz para choclos.

Figuran algunas consideraciones generales con relación al uso de híbridos varietales en maíz y la forma como se obtiene la semilla. Señala las principales características agronómicas y morfológicas de las 2 variedades que dieron orígen al híbrido ICA H-556, a saber : Cundinamarca 431 y Cacahuacintle. Destaca las características más sobresalientes del híbrido mencionado, indicando que se recomienda exclusivamente para choclos. Figuran recomendaciones sobre su cultivoMaíz-Zea may

Electronic structure analysis of the quasi-one-dimensional oxide Sr6Co5O15 within the LDA+U method

The quasi-one-dimensional cobalt oxide Sr6Co5O15 is studied using first-principles electronic-structure calculations and Boltzmann transport theory. We have been able to describe the electronic structure, characterized by the structural one-dimensionality and a particular type of charge ordering, with unexpected electronic structure of the different Co atoms. The origin of the large unquenched misaligned orbital angular momenta comes out naturally from a correct description of the different crystal-field environments. The evolution with the on-site Coulomb repulsion (U) of the electronic structure and the transport properties is discussed, with a best agreement with experiment found for the smallest value of U that allows to converge the correct in-chain ferrimagnetic ground stateThe authors thank the CESGA for the computing facilities, the Ministerio de Educación y Ciencia (MEC) for the financial support through the project MAT2009-08165, the Ministerio de Ciencia e Innovación (MICINN) for the project MAT2007-60536 and the Xunta de Galicia for the project INCITE08PXIB236052PR. A.S.B. thanks MEC for a FPU grant. M.P. and J.B. thank Isabel Barreto program and Deputación da Coruña, respectively, for financial supportS

Nuestra experiencia en esplenectomía laparoscópica versus convencional. Our experience in laparoscopic splenectomy versus conventional splenectomy

Se realizó un estudio comparativo transversal de 28 pacientes con enfermedades hematológicas a los cuales se les realizó esplenectomía, 14 por la vía convencional y 14 por cirugía de mínimo acceso, con el objetivo de realizar una comparación entre ambas técnicas quirúrgicas, en el Servicio de Cirugía del Hospital Universitario Abel Santamaría, en el período comprendido desde Mayo de1996 hasta Mayo del 2002. Se aplicó una encuesta tomando como fuente las historias clínicas que se encuentran en el archivo del hospital, donde se analizó la edad, diagnóstico preoperatorio, tiempo quirúrgico, complicaciones, estadía hospitalaria, y a los resultados les fue aplicado el método estadístico de Chi cuadrado. Los principales resultados encontrados en nuestro trabajo fueron: en el grupo de esplenectomía laparoscópica 12 pacientes se fueron de alta en las primeras 96 horas, se operaron 8 pacientes entre 180 y 240 minutos y este grupo presentó costos hospitalarios menores. En el grupo de Esplenectomía convencional 11 pacientes se fueron de alta entre los 7 y 20 días, 12 pacientes se operaron entre 60 y 180 minutos y presentaron sepsis de la herida quirúrgica 6 casos. Palabras clave: BAZO/cirugía, ESPLENECTOMIA PERITONEOSCOPIA ABSTRACT A comparative cross ? sectional study is performed in 28 patients suffering from blood disorders who underwent a splecnectomy (14 using the conventional approach and 14, the minimal access procedures) aimed at performing a comparison between both surgical procedures by Surgical Department at Abel Santamaría University Hospital during May 1996 ? May 2002. A survey was being carried out taking the clinical records from the hospital archive and age, preoperative diagnosis, surgery time, complications, hospital stay were analyzed and it was used the chi ? square statistical method. The main results found in out study were: 12 patients were discharged from the hospital after 96 hours (laparoscopic splenectomy group), the surgery time in patients ranged between 180 and 240 minutes and this group presented the lower hospital cost. In the conventional splenectomy group, 11 patients were discharged ranged between 60 and 180 minutes and presented wound sepsis (6 cases).Key words: SPLEEN/surgery, SPLENECTOMY, PERITONEOSCOPY