Desarrollo de un algoritmo de autocalibración de los parámetros extrínsecos de un sistema estéreo para aplicaciones ADAS

En este proyecto se realiza un estudio sobre la relación del entorno real que rodea a un vehículo con el sistema de la cámara estéreo instalado en él, durante la conducción del mismo con el fin de analizar la calzada por la que circula. Para ello se ha procedido a implementar un método que analiza las imágenes captadas por una cámara situada en la parte frontal del vehículo y a partir de ellas obtener la parte de la calzada transitable. En primer lugar la cámara debe calibrarse, esto se realiza de forma constante en cada instante de captura realizado por las cámaras, intentando minimizar los errores debidos a posibles vibraciones que experimente el vehículo en movimiento, lo que nos permitirá obtener resultados más precisos. Después analizaremos y etiquetaremos los diferentes píxeles de la imagen para obtener así la calzada por la que puede circular le vehículo y diferenciarla de los distintos obstáculos. Por último realizaremos una comparación entre diferentes métodos, comprobando cuál de ellos cumple los requisitos deseados., Para ello se realizarán unas simulaciones y se analizaran los valores que tomarían dichos parámetros extrínsecos, con el fin de dar validez a cada uno de los métodos utilizados.The aim of this project is to study the relationship between the real environment of a moving vehicle, and the model generated by a set of cameras installed inside this vehicle. Thus, this generated model would allow us to analyze the environment where the car drives along. With that purpose images were taken from a stereo system placed in front of the vehicle, and afterwards these images were analyzed using a method which development is the core of this project. The calibration of the cameras was implemented using a steady method that continuously takes images from the installed cameras, and then minimizes the errors due to vibration, consequence of uneven surface. This method allowed us to increase the accuracy of the results. Then, every pixel was first analyzed and the tagged accordingly, by differentiating road and different obstacles. Knowing the position of the road, we can obtain the relative position of the stereo system. That is estimated the extrinsic parameters of the stereo system. Finally, model samples were obtained through different algorithms and then compared among them. This analysis allowed us to check the quality of the results depending on the method, and so proceed to validation. The results obtained support heavily the effectiveness of the methods developed in this project.Ingeniería Industria

Knockout packet loss probability analysis of SCWP optical packet switching wavelength distributed knockout architecture

The deployment of Optical Packet Switching (OPS) in Dense Wavelength Division Multiplexing (DWDM) backbone networks is perceived as a medium term promising alternative. Scalability restrictions imply that conventional switching architectures are unfeasible in this large-scale scenario. In a previous paper, the wavelength-distributed knockout architecture was proposed as a cost-effective scaling strategy for OPS switching fabrics. In this paper, this growable architecture is applied to OPS switching fabrics able to emulate output buffering. We also propose an scheduling algorithm which provides optimum performance if knockout packet losses are made negligible. The mathematical analysis to evaluate the knockout packet loss probability of this architecture is obtained, under uniform and non-uniform traffic patterns. To complement the switch dimensioning process, an upper bound assuring 0-knockout packet losses is compared with the exact analytical results.This research has been funded by Spanish MCyT grants TEC2004-05622-C04-01/TCM (CAPITAL) and TEC2004-05622-C04-02/TCM (ARPaq) and Xunta de Galicia grant PGIDIT04TIC322003PR

Descripción de un sistema hidrofónico. Aspectos de implementación y algoritmo de conformación de haz

In this paper a system for the location and marine tracking is outlined. Some features of its hardware implementation as well as the beamforming algorithm proposed are also briefly described. The beamforming algorithm presented is a modification of a conventional scheme but a better computation efficiency is achieved

SARS-CoV-2 infection in children with cystic fibrosis: A cross-sectional multicenter study in Spain. New waves, new knowledge

COVID-19; Pediatria; VacunacióCOVID-19; Pediatría; VacunaciónCOVID-19; Pediatrics; VaccinationIntroduction The association between viral infections and pulmonary exacerbations in children with cystic fibrosis (cwCF) is well established. However, the question of whether cwCF are at a higher risk of COVID-19 or its adverse consequences remains controversial. Methods We conducted an observational, multicenter, cross-sectional study of cwCF infected by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) between March 2020 and June 2022, (first to sixth COVID-19 pandemic waves) in Spain. The study aimed to describe patients' basal characteristics, SARS-CoV-2 clinical manifestations and outcomes, and whether there were differences across the pandemic waves. Results During study time, 351 SARS-CoV2 infections were reported among 341 cwCF. Median age was 8.5 years (range 0–17) and 51% were female. Cases were unevenly distributed across the pandemic, with most cases (82%) clustered between November 2021 and June 2022 (sixth wave, also known as Omicron Wave due to the higher prevalence of this strain in that period in Spain). Most cwCF were asymptomatic (24.8%) or presented with mild Covid-19 symptoms (72.9%). Among symptomatic, most prevalent symptoms were fever (62%) and increased cough (53%). Infection occurring along the sixth wave was the only independent risk factor for being symptomatic. Just eight cwCF needed hospital admission. No multisystem inflammatory syndrome, persisting symptoms, long-term sequelae, or deaths were reported. Conclusions Spanish current data indicate that cwCF do not experience higher risks of SARS-CoV-2 infection nor worse health outcomes or sequelae. Changes in patients' basal characteristics, clinical courses, and outcomes were detected across waves. While the pandemic continues, a worldwide monitoring of COVID-19 in pediatric CF patients is needed

Metacognitive Skills of Undergraduate University Students: Study Based on Three Colombian Institutions

Objetivo: El objetivo de este estudio fue determinar y comparar las habilidades metacognitivas en estudiantes de pregrado en Colombia. Método: Participaron 1204 estudiantes de tres universidades, una de carácter público y modalidad distancia; y las otras dos privadas y modalidad presencial. Se utilizó el Metacognitive Awareness Inventory (MAI) validado por Autores (2014). Para establecer diferencias significativas entre las instituciones se utilizó la Prueba HSD de Tukey, para determinar diferencias por género la prueba T y por semestre, la correlación de Pearson. Resultados: Los estudiantes tienen un nivel alto de desarrollo de sus habilidades metacognitivas, con diferencias significativas a favor de los de modalidad distancia. No hay diferencias significativas por género, aunque las mujeres tienen promedios más altos; ni por semestre. Conclusiones: Aunque los estudiantes tienen un buen desarrollo de sus habilidades se requiere fortalecer especialmente procesos de evaluación. Los estudiantes que se forman en metodología a distancia virtual mostraron un mayor grado de desarrollo de las habilidades metacognitivas que los de modalidad presencial, lo que podría explicarse por un mayor desarrollo de la autonomía como indicador de madurez para el aprendizaje

Unravelling the genetic basis of simplex Retinitis Pigmentosa cases

Retinitis Pigmentosa (RP) is the most common form of inherited retinal dystrophy (IRD) characterized ultimately by photoreceptors degeneration. Exhibiting great clinical and genetic heterogeneity, RP can be inherited as an autosomal dominant (ad), autosomal recessive (ar) and X-linked (xl) disorder. Although the relative prevalence of each form varies somewhat between populations, a major proportion (41% in Spain) of patients represent simplex cases (sRP) in which the mode of inheritance is unknown. Molecular genetic diagnostic is crucial, but also challenging, for sRP patients because any of the 81 RP genes identified to date may be causative. Herein, we report the use of a customized targeted gene panel consisting of 68 IRD genes for the molecular characterization of 106 sRP cases. The diagnostic rate was 62.26% (66 of 106) with a proportion of clinical refinements of 30.3%, demonstrating the high efficiency of this genomic approach even for clinically ambiguous cases. The high number of patients diagnosed here has allowed us to study in detail the genetic basis of the sRP. The solved sRP cohort is composed of 62.1% of arRP cases, 24.2% of adRP and 13.6% of xlRP, which implies consequences for counselling of patients and families.Union Europea PI15-01648España Ministerio de Economía y Competitividad PI11-02923Junta de Andalucía,Ministerio de Economía, Innovación, Ciencia y Empleo CTS-166

Relationship of Binge Drinking with Impairments Affecting Memory and Executive Function among University Students: A Cross-Sectional Study in Northern Spain

Binge drinking (BD) is a common practice among college students. Alcohol consumption may affect brain structures that continue to develop in early adulthood. The aim of this study was to analyze the relationship of BD with impairments affecting memory and executive function among university students. A cross-sectional study was conducted among students (aged 18?30 years) enrolled for the academic year 2018?2019 at the Faculty of Nursing of the University of Cantabria (Spain). Data collection included sociodemographic and academic information, together with alcohol and drug use information, collected by means of a semi-structured questionnaire. A battery of validated tests was used to gather neuropsychological variables. A total of 142 participants were included, of which 88.03% were women. Up to 38.03% were classified as BD. No differences were found in memory tests. Regarding executive function, better performance in the Stroop Color andWord Test was observed in non-BD but the results were not statistically significant. In conclusion, no relationship was found between memory and executive function and BD, although better performance in executive function, specifically inhibitory control, was observed in non-BD

Excessive alcohol consumption and binge drinking in college students

Background: Binge drinking (BD) refers to a pattern of alcohol consumption characterized by the consumption of large amounts of alcohol in a short period of time followed by periods of abstinence. This drinking pattern is prevalent worldwide, mainly among young people. Excessive alcohol consumption is the spectrum of consumption patterns that may have or have had health consequences, and includes the concepts of risky alcohol use, harmful alcohol use and alcohol dependence according to Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV), the latter two are currently grouped into alcohol use disorder (AUD) according to the fifth edition of the DSM (DSM-5). Due to the high prevalence of BD among young people, especially university students, as well as the important consequences of its practice, a study was conducted to evaluate excessive alcohol consumption and its relationship with the practice of BD in university students. Methods: A cross-sectional study was conducted among students (aged 18-30 years) enrolled in the academic year 2018-2019 at the Faculty of Nursing at a university in northern Spain. Data collection included sociodemographic information, and alcohol use information, collected using a semi-structured questionnaire. To measure the excessive alcohol consumption, this study used the Alcohol Use Disorders Identification Test (AUDIT). Results: A total of 142 participants were included, of which 88.03% were women. Up to 38.03% were classified as BD. Up to 14.77% of non-BD participants and 66.67% of BD participants were classified as risky drinkers (AUDIT Total geq 8 in men or geq 6 in women) (p < 0.001). Up to 3.41% of the non-BD and 24.07% of the BD were drinkers with harmful alcohol use and probable alcohol dependence (AUDIT Total geq 13) (p < 0.001). A total of 5.68% of non-BD and 42.59% of BD were AUD drinkers (AUDIT Total geq 9 in males or geq 8 in females) (p < 0.001). In addition, statistically significant differences were found between the BD and non-BD groups in the responses to each of the AUDIT items, as well as in the total score and also in the scores of the three domains of the questionnaire. Conclusions: Excessive alcohol consumption is frequent among university students, especially among those who practice BD

In Vivo Assessment of Pulmonary Arterial Wall Fibrosis by Intravascular Optical Coherence Tomography in Pulmonary Arterial Hypertension : A New Prognostic Marker of Adverse Clinical Follow-Up

The aim is to correlate pulmonary arterial (PA) remodeling estimated by PA fibrosis in PA hypertension (PAH) with clinical follow-up. Histology of PA specimens is also performed. 19 patients, aged 54±16 (4 men), functional class II-III were studied with right heart catheterization, PA Intravascular Ultrasound and optical coherence tomography (OCT) in inferior lobe segment. PA wall fibrosis was obtained by OCT (area of fibrosis/PA cross sectional area × 100). Patients follow-up was blind to OCT. Events were defined as mortality, lung transplantation, need of intravenous prostaglandins or onset of right ventricular failure. OCT measurements showed high intra- and interobserver agreement. There was a good correlation between OCT and histology in PA fibrosis from explanted lungs. Area of fibrosis was 1.4±0.8 mm 2, % fibrosis was 22.3±8. Follow-up was 3.5 years (2.5-4.5). OCT %Fib was significantly correlated with PA capacitance (r=-0.536) and with pulmonary vascular rsistance (r=0.55). Patients were divided according to the median value of PA fibrosis. There were 10 patients with a high (≥ 22%) and 9 with a low fibrosis (<22%). Events occurred in 6 (1 death, 1 lung transplantation, 2 intravenous prostaglandins, 2 right heart failure) out of 10 patients with high and in 0 out of 9 patients with low fibrosis (p<0.01). In PAH, the severity of PA remodeling assessed by OCT wall fibrosis was significantly predictive of severely unfavorable clinical outcome. In vivo assessment of pulmonary arterial wall fibrosis by intravascular OCT in PAH is a promising new prognostic marker of adverse clinical outcome

Relationship between Depressive Symptoms, Personality, and Binge Drinking among University Students in Spain

Binge drinking (BD) is a common practice among college students. Alcohol consumption has been related to depressive symptoms and certain personality factors, although less is known about the relationship of these variables with BD. The aim of this study was to analyze the relationship of BD with depressive symptoms and personality in university students. We performed a cross-sectional study among students (aged 18?30 years) enrolled in the academic year 2018-2019 at the Faculty of Nursing of the University of Cantabria (Spain). Sociodemographic, academic, and alcohol and other drug use information was collected by means of a semi-structured questionnaire. The Beck Depression Inventory-II was used to measure depressive symptomatology and the Neo Five-Factor Inventory was used for personality. A total of 142 participants were included, 88.03% of which were women. Up to 38.03% were classified as BD. Concerning depressive symptoms, 7.41% of BD were at the moderate-severe level compared to 3.41% of non-BD (p = 0.7096). Regarding personality, the median score for extraversion of BD was 35 (Q1 = 29, Q3 = 40), 32 (Q1 = 28, Q3 = 36) in non-BD (p = 0.0062), conscientiousness scored 34 (Q1 = 30.5, Q3 = 38) points in non-BD, 31.50 (Q1 = 27, Q3 = 37) in BD (p = 0.0224). In conclusion, BD students have higher levels of extraversion and lower levels of responsibility than non-BD students. No significant differences were found between the level of depressive symptomatology between BD and non-BD students