Uso de códigos convolucionales en redes colaborativas

The objective of this thesis was to acquire the knowledge about the works perform by professor Soleymani and his student group in collaborative communications. We decided to start from the beginning simulating a wireless communication scenario and we thought it would be of great value to implement and simulate a convolutional channel code with Viterbi decoding. The last part has been about studying collaboration trough the references and some implemented simulations. The main issue of this thesis has been the implementation and usage of a convolutional code with Viterbi decoding in a collaborative scenario. Throughout the period of duration of the work, we have first modelled a simple convolutional code that we have tested and compared with the case in which we did not have any channel coding. Later on, in a second phase of the project, we have used that convolutional code implemented combined with collaboration. To help with the simulations, we have implemented our code in MATLAB and we have made a comparison in performances between different possible scenarios. ______________________________________________________El objetivo básico de este proyecto fin de carrera ha sido el estudio de algunos temas dentro de las líneas de investigación llevadas a cabo por el profesor Soleymani y su grupo de estudiantes de doctorado, en la universidad de Concordia, durante mi estancia en dicha universidad. Se decidió empezar por lo más básico, la simulación de un entorno inalámbrico (Wireless) al que añadimos una codificación de canal en forma de código convolucional con decodificación Viterbi. Una vez implementado este escenario, se ha añadido el estudio de las redes colaborativas mediante las referencias bibliográficas recomendadas y ciertas simulaciones en Matlab. El objetivo principal de este trabajo ha sido la implementación y uso del código convolucional aplicado a un entorno colaborativo. Para ello, la primera parte del trabajo ha consistido en la realización de un código convolucional que ha sido estudiado y probado para, a continuación, ser aplicado en redes colaborativas con nodos ayudando en la transmisión de la información. Se ha comprobado, a través de una serie de simulaciones en Matlab, que el uso de nodos auxiliares mejora las prestaciones de los distintos sistemas propuestos y sería algo recomendable de implementar en ciertas aplicaciones prácticas.Ingeniería de Telecomunicació

Propriedades psicométricas de uma escala para medir a gestão da vergonha em adolescentes (Moss-Sast)

(Ahmed, 1999) to measure shame management in adolescents in situations of aggression toward peers. The study was conducted with a sample of 700 students from public secondary schools (N= 700) located in a northwestern state municipality of Mexico. Results enabled to obtain an empirically sustainable measuring model formed by two factors: Acknowledgment and Displacement (X2 = 5.16, p= 0.27; CMIN= 1.29; GFI= .98; CFI= .99; NFI= .97; RMSEA= .05). Evidence was obtained to show that the instrument has criterion validity since it is capable to differentiate between subgroups of students with and without reports of bullying in both factors, Acknowledgment (t= 3.49, gl= 137, p< .001) and Displacement (t= 3.63, gl= 137, p< .001). It was concluded that the results strengthen the original factorial structure of the scale and show the usefulness of the same, both for inquiring about emotions related to moral development and for identifying students involved as aggressors in bullying situations.Se establecieron las evidencias de validez y confiabilidad de la adaptación del cuestionario MOSS-SAST (Ahmed, 1999) para medir el manejo de la vergüenza en adolescentes ante situaciones de agresión hacia los pares. El estudio se realizó en una muestra de estudiantes de escuelas secundarias públicas (N= 700) ubicadas en un municipio de un estado del noroeste de México. Los resultados permitieron obtener un modelo de medición empíricamente sustentable formado por nueve ítems agrupados en dos factores: Reconocimiento y Desplazamiento (c2 = 5.16, p= 0.27; CMIN= 1.29; GFI= .98; CFI= .99; NFI= .97; RMSEA= .05). El instrumento cuenta con evidencias de validez de criterio, ya que establece la diferencia en los factores de reconocimiento (t= 3.49, gl= 137, p< .001) y desplazamiento (t= 3.63, gl= 137, p< .001) en subgrupos de estudiantes con y sin reportes de bullying. Se concluyó que los resultados fortalecen la estructura factorial original de la escala y muestran su utilidad, tanto en la indagación de emociones relacionadas con el del desarrollo moral, como en la identificación de estudiantes involucrados como agresores en situaciones de bullying.Foram estabelecidas as evidências de validade e confiabilidade da adaptação do Questionário MOSS-SAST (Ahmed, 1999) para medir a gestão da vergonha em adolescentes ante situações de agressão contra os pares. O estudo foi realizado com uma amostra de estudantes do ensino fundamental e médio (N=700) de um município do noroeste do México. Os resultados permitiram obter um modelo de medição empiricamente sustentável, formado por nove itens agrupados em dois fatores: reconhecimento e deslocamento (c2 = 5.16, p= 0.27; CMIN= 1.29; GFI= .98; CFI= .99; NFI= .97; RMSEA= .05). O instrumento conta com evidências de validade de critério já que estabelece a diferença nos fatores de reconhecimento (t= 3.49, gl= 137, p< .001) e deslocamento (t= 3.63, gl= 137, p< .001) em subgrupos de estudantes com e sem relatos de bullying. Conclui-se que os resultados fortalecem a estrutura fatorial original da escala e mostram sua utilidade, tanto na indagação de emoções relacionadas com o desenvolvimento moral quanto na identificação de estudantes envolvidos como agressores em situações de bullying

Reduction of trichloromethyl to gem-dichloromethyl group with triphenylphosphine and water in ethyl acetate

En este trabajo se reporta un método de reducción de triclorometil compuestos bajo condiciones amigables al medio ambiente.A novel and efficient way of reducing trichloromethyl to gem-dichloromethyl compounds using environmentally friendly conditions has been developed. This reduction process consists of the treatment of a trichloromethyl compound with water and triphenylphosphine using ethyl acetate as solvent. This reaction proceeds in good yield when a strong electron-withdrawing group is attached to the trichloromethyl derivative.Conacy

Caracterización de la Trisomía 21 o Síndrome de Down mediante descriptores texturales clásicos aplicados a imágenes de hipocampo murino

Universidad de Sevilla. Grado en Ingeniería de las Tecnologías de Telecomunicació

Incremento en la prevalencia del VIH y en las conductas de riesgo asociadas en hombres que tienen sexo con hombres: 12 años de encuestas de vigilancia conductual en Cataluña

ResumenObjetivosDescribir las tendencias en la prevalencia de la infección por VIH, las conductas de riesgo asociadas a su transmisión y las actitudes respecto a los tratamientos antirretrovirales en el colectivo de hombres que tienen sexo con hombres reclutados en Cataluña entre 1995 y 2006.MétodosEstudios transversales bianuales en una muestra de conveniencia de hombres que tienen sexo con hombres reclutados en saunas, sex-shops, bares y un parque público, y por correo a los socios de la Coordinadora Gai-Lesbiana, mediante un cuestionario anónimo y autoadministrado. Se recogieron muestras de saliva para determinar la prevalencia de la infección por VIH. La significación de las tendencias lineales en las proporciones se analizó mediante el test de χ2 de tendencia lineal, estratificando por edad.ResultadosLa prevalencia global del VIH aumentó del 8,5% (1995) al 14,1% (2006) en los menores de 30 años (p=0,162), y del 18,2% (1995) al 21,2% (2006) en los de 30 años y más (p=0,07). El uso consistente del preservativo en la penetración anal con parejas ocasionales descendió del 72,9% al 58,7% en los menores de 30 años (p<0,05), y del 77,2% al 65,6% en los de 30 años y más (p<0,001). El porcentaje que afirmó que debido a los antirretrovirales «yo cada vez elijo prácticas de más riesgo» pasó del 9,2% al 19,4% en los menores de 30 años, y del 8,3% al 16,7% en los de 30 años y más (p<0,05).ConclusionesLos resultados muestran una tendencia creciente en la prevalencia del VIH y de las conductas de riesgo asociadas en el colectivo de hombres que tienen sexo con hombres de Cataluña. Por tanto, los programas de prevención dirigidos a este colectivo deberían intensificarse e incorporar nuevas estrategias de reducción de riesgos, así como otros mensajes educativos sobre los antirretrovirales.AbstractObjectivesTo describe trends in HIV prevalence, in risk behaviors associated with HIV transmission, and in knowledge and attitudes related to antiretroviral therapy (ART) among men who have sex with men (MSM) recruited in Catalonia between 1995 and 2006.MethodsBiannual cross-sectional surveys were performed. An opportunistic sample of MSM was recruited in saunas, sex shops, bars and a cruising site in a public park. In addition, an anonymous self-administered questionnaire was sent by mail to all members of a gay and lesbian association (Coordinadora Gai-Lesbiana). Oral fluid samples were collected to determine HIV prevalence. Linear trends in proportions were assessed by the χ2 test, stratified by age.ResultsThe overall prevalence of HIV infection increased from 8.5% (1995) to 14.1% (2006) among men aged less than 30 years old (p=0.162) and from 18.2% (1995) to 21.2% (2006) among those aged 30 years old or more (p=0.07). Consistent condom use in anal intercourse with occasional partners decreased from 72.9% to 58.7% in men aged less than 30 years old (p <0.05) and from 77.2% to 65.6% in those aged 30 years old or more (p<0.001). The proportion of men who reported they chose riskier behaviors because of ART increased from 9.2% to 19.4% in men aged less than 30 years old and from 8.3% to 16.7% in those aged 30 years old or more (p<0.05).ConclusionsAn increasing trend in the prevalence of HIV and associated risk behaviors was found in Catalonia among MSM. Therefore, preventive programs targeting this population should be intensified and should include new risk reduction strategies, as well as other educational messages about ART

Urban form in the tourist cities of the coast of the Canary Islands. The morphologies of leisure activities

[EN] The tourist city has been a space with few and weak reflections from the urban discipline. The developed planning, at best, has been uncritically exported from the residential city. However, in these cities, almost 12% of Spanish GDP is generated. The vast majority of Spanish coasts, especially on the Mediterranean coast and in the archipelagos, are occupied by large areas of holiday cities. Many of them were born in the first boom of Spanish tourism in the 60's. The mass tourism model, predominant in our coast, also generates a mass city. The morphology of this city does not follow the common and more consolidated patterns of the residential city. Today many of these tourist destinations begin to show of obsolescence. For this reason, the analysis of its urban form is a valuable tool in the face of its renovation project. In this work, we propose the analysis of the tourist micro-destinations of the Canarian archipelago. In order to this we will identify the main morphological patterns and characterize them from the analysis of a set of descriptive indicators related to public and private space.Temes Córdovez, R.; Simancas Cruz, M.; García Amaya, A.; Peñarrubia Zaragoza, MP. (2018). Urban form in the tourist cities of the coast of the Canary Islands. The morphologies of leisure activities. En 24th ISUF International Conference. Book of Papers. Editorial Universitat Politècnica de València. 1157-1166. https://doi.org/10.4995/ISUF2017.2017.5964OCS1157116

Nuevas aportaciones al conocimiento de la fauna cavernícola terrestre de las coves del Pirata, cova des Pont, cova de sa Piqueta y la cova dels Xots

&#091;spa&#093; Se presentan los resultados de los muestreos de la fauna terrestre cavernícola realizados en las Coves del Pirata, Cova des Pont, Cova de sa Piqueta y Cova des Xots, todas ellas cavidades de la zona de Can Frasquet, en el término municipal de Manacor. Se ha aumentado el conocimiento del patrimonio biológico de estas cavidades, con nuevas citas para la isla de Mallorca, así como nuevos datos sobre la distribución de las especies de invertebrados terrestres que se pueden localizar en las cavidades de las islas Baleares.&#091;cat&#093; Es presenten els resultats dels mostretjos de la fauna terrestre cavernícola realitzats a les coves del Pirata, cova des Pont, cova de sa Piqueta i cova des Xots, totes elles cavitats de la zona de Can Frasquet, del terme municipal de Manacor. S’ ha incrementat el coneixement del patrimoni biològic d’aquestes cavitats, amb noves cites per Mallorca, així com noves dades sobre la distribució de les espècies d’invertebrats terrestres que es poden localitzar a les cavitats de les illes Balears.&#091;eng&#093; We present the results of sampling cave terrestrial fauna in several Majorcan caves: Cova del Pirata, Cova des Pont, Cova de sa Piqueta and Cova des Xots, all of them from the Can Frasquet zone, in the municipality district of Manacor. The knowledge on the biological communities of these caves has been increased with new records for the island of Mallorca, as well as new data about the distribution of some terrestrial invertebrate species that can be found in the caves of the Balearic Islands

Improvement of antibiotic therapy and ICU survival in severe non-pneumococcal community-acquired pneumonia: a matched case-control study

INTRODUCTION: We aimed to compare intensive care unit mortality due to non-pneumococcal severe community-acquired pneumonia between the periods 2000-2002 and 2008-2014, and the impact of the improvement in antibiotic strategies on outcomes. METHODS: This was a matched case-control study enrolling 144 patients with non-pneumococcal severe pneumonia: 72 patients from the 2000-2002 database (CAPUCI I group) were paired with 72 from the 2008-2014 period (CAPUCI II group), matched by the following variables: microorganism, shock at admission, invasive mechanical ventilation, immunocompromise, chronic obstructive pulmonary disease, and age over 65 years. RESULTS: The most frequent microorganism was methicillin-susceptible Staphylococcus aureus (22.1%) followed by Legionella pneumophila and Haemophilus influenzae (each 20.7%); prevalence of shock was 59.7%, while 73.6% of patients needed invasive mechanical ventilation. Intensive care unit mortality was significantly lower in the CAPUCI II group (34.7% versus 16.7%; odds ratio (OR) 0.78, 95% confidence interval (CI) 0.64-0.95; p = 0.02). Appropriate therapy according to microorganism was 91.5% in CAPUCI I and 92.7% in CAPUCI II, while combined therapy and early antibiotic treatment were significantly higher in CAPUCI II (76.4 versus 90.3% and 37.5 versus 63.9%; p < 0.05). In the multivariate analysis, combined antibiotic therapy (OR 0.23, 95% CI 0.07-0.74) and early antibiotic treatment (OR 0.07, 95% CI 0.02-0.22) were independently associated with decreased intensive care unit mortality. CONCLUSIONS: In non-pneumococcal severe community-acquired pneumonia , early antibiotic administration and use of combined antibiotic therapy were both associated with increased intensive care unit survival during the study period