The conjugate gradient partitioned block frequency-domain for multichannel adaptive filtering

The conjugate gradient is the most popular optimization method for solving large systems of linear equations. In a system identification problem, for example, where very large impulse response is involved, it is necessary to apply a particular strategy which diminishes the delay, while improving the convergence time. In this paper we propose a new scheme which combines frequency-domain adaptive filtering with a conjugate gradient technique in order to solve a high order multichannel adaptive filter, while being delayless and guaranteeing a very short convergence time.

Oportunidades comerciales para productores y exportadores colombianos de mangostanes y mangos en los Países Bajos a partir del Tratado de Libre Comercio con la Unión Europea

El presente trabajo de investigación se realizó con el propósito de esclarecer y brindarle información pertinente y actualizada a los productores nacionales de frutas exóticas como el mango y el mangostán, acerca de las oportunidades comerciales que estos poseen con países pertenecientes a la Unión Europea (UE), debido al creciente consumo de frutas en estos países y al acuerdo comercial vigente que posee Colombia y la UE. Con el fin de que el sector agrícola crezca y pueda establecerse en mercados diferentes al nacional, facilitando el crecimiento económico del sector y del país. Así mismo, se buscó ilustrar a los empresarios colombianos acerca de los potenciales consumidores, formas de ingreso y los requisitos sanitarios y fitosanitarios solicitados en dichos países. Así como, las ventajas y desventajas que poseen frente a otros competidores del Suroeste Asiático y Africano, productores asiduos de frutas exóticas y grandes exportadores mundiales, que a la vez poseen convenios con la UE, que facilitan el ingreso de sus productos a la misma. De esta forma, esta investigación reduce la brecha entre la información que poseen los productores nacionales del sub-sector agrícola, frente a la información existente del mercado, mitigando las desventajas de la desinformación y analizando las oportunidades más favorables para los mismos.

Oportunidades en los mercados de Nueva York, Nueva Jersey y Nebraska para las empresas colombianas

Actualmente, las barreras comerciales a nivel internacional resultan cada vez menos tangibles entre los diferentes mercados, haciendo que las oportunidades de comercialización de bienes y servicios entre países sea cada vez mayor. Sin embargo, es muy común todavía encontrarse con historias de fracaso en los esfuerzos de diferentes empresarios medianos y pequeños que en su momento decidieron emprender el camino de la internacionalización de sus compañías y que por diferentes factores, bien sea desconocimiento de leyes comerciales internacionales, desinformación primordial del mercado objetivo o simplemente por situaciones ajenas a ellos sufrieron esta adversidad y dejaron de lado su impulso e interés por internacionalizarse. Por tal razón, hemos enfocado nuestros esfuerzos en tratar de identificar las diferentes potencialidades y oportunidades que el empresario colombiano puede llegar a tener en cuatro estados de Estados Unidos de Norteamérica, Nueva York, Nueva Jersey, Nuevo Hampshire y Nebraska específicamente. La metodología a desarrollar a lo largo de esta investigación principalmente recoge información cualitativa y cuantitativa que nos permitirá desglosar diversos aspectos con mayor profundidad, para que el empresario interesado tenga un panorama más claro de lo que puede llegar a encontrarse en los estados mencionados anteriormente.

Reliability of Tethered Swimming Evaluation in Age Group Swimmers

The aim of the present study was to examine the reliability of tethered swimming in the evaluation of age group swimmers. The sample was composed of 8 male national level swimmers with at least 4 years of experience in competitive swimming. Each swimmer performed two 30 second maximal intensity tethered swimming tests, on separate days. Individual force-time curves were registered to assess maximum force, mean force and the mean impulse of force. Both consistency and reliability were very strong, with Cronbach’s Alpha values ranging from 0.970 to 0.995. All the applied metrics presented a very high agreement between tests, with the mean impulse of force presenting the highest. These results indicate that tethered swimming can be used to evaluate age group swimmers. Furthermore, better comprehension of the swimmers ability to effectively exert force in the water can be obtained using the impulse of force. Key words: swimming, training and testing, propulsive force, front crawl.

Prática de ensino supervisionada em educação pré-escolar: estimular o pensamento criativo-expressão dramática

O presente relatório de estágio que se enquadra no âmbito das unidades curriculares da Prática de Ensino Supervisionada I e II em Creche e Jardim de Infância, descreve e analisa todo o trabalho realizado em torno do desenvolvimento da criatividade na expressão dramática, tendo sido elaborado nas instalações do colégio Nossa Senhora da Piedade ao longo do Mestrado em Educação Pré-Escolar. Ao longo do relatório, é feita referência a uma investigação relativa à importância do desenvolvimento da criatividade e da expressão dramática, bem como o papel do educador e da sua ação no desenvolvimento, tendo por base os fundamentos teóricos como a Carta de Princípios para uma Ética Profissional da Associação de Profissionais de Educação de Infância (APEI) e o Perfil Profissional da Associação de Profissionais de Educação de Infância. O presente relatório retrata a prática e investigação em torno da temática, procurando realçar a importância da expressão dramática e mais aprofundadamente da criatividade no desenvolvimento da criança e por sua vez o impulso que esta pode ter no desenvolvimento da ação educativa, que sempre foi tido em conta ao longo da prática; Supervised Teaching practice on Pre-school education: The Stimulate creative thinking - drama expression Abstract: The present internship report, whose context falls on Day Care Centre and Kindergarten of the Supervise Teaching Practice curricular units I and II, describes and analyse all the work about the development of the creativity in the dramatic expression. It was developed in the facilities of the institution Nossa Senhora da Piedade during the master’s degree in Preschool Education. Throughout the report, it’s made a reference to an investigation on the value of the creativity in the dramatic expression development, as well as the educator’s role and his action on the development, based on the theoretical foundations as the Letter of Principles to a Professional Ethics from the Preschool Professional Association (APEI) and Preschool Teacher Professional Profile. The present report shows the practice and investigation around this issue, seeking to highlight the importance of the dramatic expression and deeper the importance of the creativity in the child development and also the impulse that this may have in the development of the educational action, which has always been taken in mind throughout the practice.

La marionnette et son drame. Les dramaturgies pour le théâtre de marionnettes contemporain en France et en Italie (1980-2020)

Le théâtre de marionnettes a connu, depuis la fin du XXe siècle, de profondes mutations, tant sur le plan esthétique que sur celui du dispositif dramaturgique. Si en France des expériences plurielles de collaboration entre écrivains et marionnettistes se sont développées, en Italie ont émergé des expérimentations dramatiques de la part des marionnettistes eux-mêmes, auteurs de textes aux qualités littéraires. Au fil des rencontres avec la scène marionnettique, la posture de l’auteur devient « fluide », allant de l’écrivain extérieur répondant à une commande, au dramaturge et au co-créateur des spectacles. Une attention accrue aux enjeux dramaturgiques a renforcé les relations des arts de la marionnette avec le théâtre d’acteurs. En vertu de cette osmose, certaines caractéristiques du régime contemporain de l’écriture pour la scène, comme la « rhapsodisation » des textes mise en évidence par Jean-Pierre Sarrazac et les traits « postdramatiques » décrits par Hans-Thies Lehmann, sont à l’œuvre dans les pièces pour marionnettes écrites depuis les années 1980. La comparaison des créations françaises (par Daniel Lemahieu et François Lazaro, Jean Cagnard et la Cie Arketal, Kossi Efoui et Théâtre Inutile, Dennis Cooper et Gisèle Vienne) et italiennes (par Guido Ceronetti, Giuliano Scabia, Gigio Brunello et Gyula Molnár, Marta Cuscunà, Fabiana Iacozzilli, entre autres) montre comment elles exploitent la marionnette afin d’agencer la parole aux images suscitées par l’objet. Bien que l’on puisse observer un plus grand élan innovateur en France, tandis que les relations avec les différentes traditions régionales restent ancrées en Italie, l’analyse de textes nous apprend que les motifs les plus récurrents sont communs aux deux territoires, en vertu des possibilités de figuration qu’offre la marionnette : la confrontation avec les problèmes actuels et les traumatismes de l’histoire, la plongée dans l’esprit humain, l’imagination de territoires post-anthropocentriques, la rencontre avec le trouble et la mort

Discharge characteristics and discharge simulation model of long air gaps containing a floating conductor

Long air gaps containing a floating conductor are common insulation types in power grids. During the transmission line live-line work, the process of lineman entering the transmission line air gap constitutes a live-line work combined air gap, which is a typical long air gap containing a floating conductor. This thesis investigates the discharge characteristics, the discharge mechanism and a discharge simulation model of long air gaps containing a floating conductor in order to address the engineering issues in live-line work. The innovative achievements of the thesis are as follows: (1) The effect of the gap distance, the floating electrode structure, the switching impulse wavefront time, the altitude, and the deviation of the floating conductor from the axis on the breakdown voltage was determined. (2) The physical process of the discharges in long air gaps containing a floating conductor was determined. The reason why the discharge characteristics of long air gaps containing a floating electrode with complex geometrics and sharp protrusions and long air gaps with a rod-shaped floating electrode are similar has been studied. The formation mechanism of the lowest breakdown voltage area of a long air gap containing a floating conductor is explained. (3) A simulation discharge model of long air gaps containing a floating conductor was established, which can describe the physical process and predict the breakdown voltage. The model can realize the accurate prediction of the breakdown voltage of typical long air gaps containing a floating conductor and live-line work combined air gaps in transmission lines. The findings of the study can provide theoretical reference and technical support for improving the safety of live-line work.

In-car sound linear simulation

In recent years, vehicle acoustics have gained significant importance in new car development: increasingly advanced infotainment systems for spatial audio and sound enhancement algorithms have become the norm in modern vehicles. In the past, car manufacturers had to build numerous prototypes to study the sound behaviour inside the car cabin or the effect of new algorithms under development. Nowadays, advanced simulation techniques can reduce development costs and time. In this work, after selecting the reference test vehicle, a modern luxury sedan equipped with a high-end sound system, two independent tools were developed: a simulation tool created in the Comsol Multiphysics environment and an auralization tool developed in the Cycling ‘74 MAX environment. The simulation tool can calculate the impulse response and acoustic spectrum at a specific position inside the cockpit. Its input data are the vehicle’s geometry, acoustic absorption parameters of materials, the acoustic characteristics and position of loudspeakers, and the type and position of virtual microphones (or microphone arrays). The simulation tool can also provide binaural impulse responses thanks to Head Related Transfer Functions (HRTFs) and an innovative algorithm able to compute the HRTF at any distance and angle from the head. Impulse responses from simulations or acoustic measurements inside the car cabin are processed and fed into the auralization tool, enabling real-time interaction by applying filters, changing the channels gain or displaying the acoustic spectrum. Since the acoustic simulation of a vehicle involves multiple topics, the focus of this work has not only been the development of two tools but also the study and application of new techniques for acoustic characterization of the materials that compose the cockpit and the loudspeaker simulation. Specifically, three different methods have been applied for material characterization through the use of a pressure-velocity probe, a Laser Doppler Vibrometer (LDV), and a microphone array.

Network analysis and machine learning assist drug repurposing and safety assessment in neurological diseases

In recent decades, two prominent trends have influenced the data modeling field, namely network analysis and machine learning. This thesis explores the practical applications of these techniques within the domain of drug research, unveiling their multifaceted potential for advancing our comprehension of complex biological systems. The research undertaken during this PhD program is situated at the intersection of network theory, computational methods, and drug research. Across six projects presented herein, there is a gradual increase in model complexity. These projects traverse a diverse range of topics, with a specific emphasis on drug repurposing and safety in the context of neurological diseases. The aim of these projects is to leverage existing biomedical knowledge to develop innovative approaches that bolster drug research. The investigations have produced practical solutions, not only providing insights into the intricacies of biological systems, but also allowing the creation of valuable tools for their analysis. In short, the achievements are: • A novel computational algorithm to identify adverse events specific to fixed-dose drug combinations. • A web application that tracks the clinical drug research response to SARS-CoV-2. • A Python package for differential gene expression analysis and the identification of key regulatory "switch genes". • The identification of pivotal events causing drug-induced impulse control disorders linked to specific medications. • An automated pipeline for discovering potential drug repurposing opportunities. • The creation of a comprehensive knowledge graph and development of a graph machine learning model for predictions. Collectively, these projects illustrate diverse applications of data science and network-based methodologies, highlighting the profound impact they can have in supporting drug research activities.

Development of iodine and air chemistry models for the simulation of plasma in Helicon Plasma Thrusters

The aim of this work is to analyse the chemistry models of low pressure Helicon discharges fed with iodine and air. In particular the focus of this research is to understand the plasma dynamics in order to predict propulsive performances of iodine and air-breathing Helicon Plasma Thrusters. The two systems have been simulated and analysed with the use of global models, i.e. a 0 dimensional tool to solve the set of governing equations by assuming that all quantities are volume averaged. Furthermore, some strategies have been implemented to improve the accuracy of this approach. A verification have been accomplished on the global models for both iodine and air, comparing results against simulations taken from literature. Moreover, the iodine global model has been validated against the experimental measurements of REGULUS, an helicon plasma thruster developed by the Italian company T4i, with a good agreement. From the analysis of iodine model, it has been found a significantly higher density for atomic positive ions with respect to molecular ions. Negative ions, instead, have shown to have negligible effect on the propulsive results. Also, the influence of reactions between heavy particles has been analysed with the global model. Results have demonstrated that, in the iodine case, chemistry is almost entirely affected by electronic collisions. For what concerns air-breathing results, it has been investigated the effects of the orbital height on propulsive performances. In particular, the global model has shown that at lower height, the values of thrust and specific impulse are lower due a change in atmosphere concentration. Finally, the iodine chemistry model has been introduced in the fluid code 3D-VIRTUS in order to preliminary assess the plasma properties of a Helicon discharge chamber for electric propulsion.

Plano de ação para diminuir fatores de risco que influenciam a alta taxa de morbimortalidade associadas ao risco casrdiovascular na população de Vila Nova

O Risco Cardiovascular é na atualidade um grande problema da Saúde Pública, que atinge todos os países do mundo, no Brasil como em outros países, a principal causa de morte está associada às Doenças Cardiovasculares, as quais tem manifestações nos vasos sanguíneos e coração. Existem vários fatores de risco que estão associados ao padecimento destas doenças. Podendo dividir eles num conjunto de fatores individuais sobre os quais se pode influir e modificar, e um conjunto de fatores não modificáveis, que também podem influir significativamente para o desenvolvimento dessas doenças. Utilizou-se o Método de Estimativa rápida para a seleção do problema principal e teve como objetivo montar um Plano para intervir no alto risco cardiovascular da população. De um total de 2.492 pessoas, 1.368 são maiores de 20 anos o que representa o 54,89% da população, deles 34% tem risco cardiovascular, onde foram incluímos os pacientes com HAS (Hipertensão Arterial Sistêmica), diabetes mellitus, obesidade, gordura abdominal, cardiopatias, dislipidemias, tabagistas, alcoólatras, etc. O projeto foi feito usando o Planejamento Estratégico Situacional (PES), conforme Campos, Faria, Santos (2010), mediante a pesquisa bibliográfica, na modalidade de revisão narrativa utilizando as bases de dados da LILACSe SciELO. Utilizou-se os descritores de Ciencias da Saúde como: Doenças cardiovasculares e educação em saúde. Tem-se como objetivo diminuir os fatores de risco que influenciam a alta taxa de morbimortalidade associadas ao Risco Cardiovascular e aumentar o nível de conhecimento da população que abrange a Unidade Básica de Saúde Vila Nova em Colônia Leopoldina, Alagoas, como dos profissionais de saúde, deixando um legado que impulse a realização de futuros estudos assim como manter a Educação Permanente como um instrumento necessário para a diminuição de incidência de Riscos Cardiovasculares.