Spectral and Steady-State Properties of Random Liouvillians

We study generic open quantum systems with Markovian dissipation, focusing on a class of stochastic Liouvillian operators of Lindblad form with independent random dissipation channels (jump operators) and a random Hamiltonian. We establish that the global spectral features, the spectral gap, and the steady-state properties follow three different regimes as a function of the dissipation strength, whose boundaries depend on the particular quantity. Within each regime, we determine the scaling exponents with the dissipation strength and system size. We find that, for two or more dissipation channels, the spectral gap increases with the system size. The spectral distribution of the steady state is Poissonian at low dissipation strength and conforms to that of a random matrix once the dissipation is sufficiently strong. Our results can help to understand the long-time dynamics and steady-state properties of generic dissipative systems.Comment: 21 pages, 11 figures. v2: minor corrections. v3: additional details, as publishe

Programa digital para la conciencia fonológica: un estudio aleatorizado

The purpose of this study is to analyze the efficacy of the Phonological Awareness Digital Program (PADP) in typically developing preschool children aged 4 to 6 years. A randomized controlled trial was conducted with a total of 49 children assigned to two groups: the experimental group, EG (n=25) and the delayed control group, CG (n=24). Both groups were assessed before and after the implementation of the PADP. A follow-up study for the experimental group was also performed after two months. Outcome measures of phonological awareness skills (task 1: Syllable segmentation task; task 2: Syllable identification task; task3: Syllable omission task; task 4: Onset-rime units segmentation task; task 5: Phoneme segmentation task; task 6: Phoneme blending task) were evaluated at three separate moments. The results showed significant improvement in phonological awareness skills for the EG between the first and the second assessments for all the tasks considered. Between the second and third assessment, the results showed a significant improvement for the CG. The follow-up study also demonstrated the PADP’s efficacy. The PADP has shown to be an effective program in promoting the development of phonological awareness in children. These findings provide evidence for different professionals to use PADP with preschool children.El propósito de este estudio es analizar la eficacia del Programa Digital de Conciencia Fonológica (PADP) en niños en edad preescolar con desarrollo típico de 4 a 6 años. Se realizó un ensayo controlado aleatorio con un total de 49 niños asignados a dos grupos: el grupo experimental, GE (n = 25) y el grupo de control retardado, GC (n = 24). Ambos grupos fueron evaluados antes y después de la implementación del PADP. También se realizó un estudio de seguimiento para el grupo experimental después de dos meses. Medidas de resultado de las habilidades de conciencia fonológica (tarea 1: tarea de segmentación de sílabas; tarea 2: tarea de identificación de sílabas; tarea 3: tarea de omisión de sílabas; tarea 4: tarea de segmentación de unidades de inicio-tiempo; tarea 5: tarea de segmentación de fonemas; tarea 6: tarea de combinación de fonemas) fueron evaluados en tres momentos separados. Los resultados mostraron una mejora significativa en las habilidades de conciencia fonológica para el GE entre la primera y la segunda evaluación para todas las tareas consideradas. Entre la segunda y la tercera evaluación, los resultados mostraron una mejora significativa para el GC. El estudio de seguimiento también demostró la eficacia del PADP. El PADP ha demostrado ser un programa eficaz para promover el desarrollo de la conciencia fonológica en los niños. Estos hallazgos proporcionan evidencia para que diferentes profesionales utilicen PADP con niños en edad preescolar.publishe

Do political news affect financial real estate markets?

Este artigo investiga se as notícias políticas afetam o mercado financeiro imobiliário brasileiro. Para isso, foram desenvolvidos dois softwares. Primeiro, um software para extrair, transformar e carregar os bancos de dados. Em seguida, um software para realizar a exploração dos dados e aplicar um método não paramétrico usando o teste de causalidade de Granger. Concluiu-se que o volume de notícias políticas Granger não causa volatilidade nos retornos imobiliários no período de janeiro de 2011 a maio de 2022.This paper investigates whether political news affect the Brazilian financial real estate market. Two softwares were developed to do so. First, a software to extract, transform and load the databases. Then, a software to perform data exploration and apply a nonparametric method using the Granger-causality test. It was concluded that the volume of political news does not Granger-cause the real estate returns volatility in the period ranging from January 2011 to May 2022

Automation of machine learning models benchmarking

Dissertação de mestrado em Engenharia InformáticaNa área de ciência de dados, o machine learning está-se a revelar uma ferramenta essencial para resolver problemas complexos. As empresas estão a investir em equipas de ciência de dados e Machine Learning para desenvolver modelos que apresentem valor para os clientes. No entanto, estes modelos são uma pequena percentagem de uma pipeline de projetos de Machine Learning (ML) e, para entregar um produto de ML completo, é necessário um número maior de componentes. DevOps é uma mentalidade de engenharia e um conjunto de práticas que visa unificar o processo de desenvolvimento e o processo de operações em um software, MLOps é um conceito similar a DevOps mas aplicado ao desenvolvimento e entrega de soluções de ML. O nível de automatização das etapas em uma pipeline de ML define a maturidade do processo de ML, que reflete a velocidade de treino de novos modelos com novos dados ou de treino de novos modelos com diferentes implementações. Um sistema de ML é um sistema de software, desenvolvimento e atualizações contínuas são necessárias para garantir um sistema que escale conforme as necessidades. O principal objetivo desta tese é apoiar a criação de um sistema integrado de ML com uma arquitetura que proporcione a capacidade de ser continuamente operada em um ambiente de produção. Um conceito para avaliação de desempenho de algoritmos deve ser elaborado e implementado. O principal obetivo e melhorar e ace'erar o cicio de desenvolvimento de modelos de ML na empresa. Para atingir este objetivo surge a necessidade de definir uma arquitetura com especificações e a implementação de processos automatizadas num pipeline de ML existente, este processo têm como objetivo alcançar uma ferramenta de benchmark de modelos, com capacidade de analisar o desempenho do modelo, um motor de inferência e um banco de dados para armazenar todas as métricas computadas. Um sistema baseado em IA em desenvolvimento fornece o caso de estudo para desenvolver e validar a arquitetura. Os avanços atuais na área da condução semiautomática introduz a necessidade de sistemas de monitoramento que podem localizar e detectar eventos especificas no veículo. Os conjuntos de sensores são instalados dentro da cabine para alimentar sistemas inteligentes que visam analisar e sinalizar certos comportamentos que podem impactar a segurança e o conforto dos passageiros..In the field of data science, ML is proving to be a core feature to solve complex real-world problems. Businesses are investing in data science and ML teams to develop AI based models that can deliver business value to their users. However, these models are only a small fraction of an ML project pipeline, and to deliver an end to end ML product, a greater number of components are needed. DevOps is an engineering mindset and a set of practices that aims to unify the development process and the operation process on software. MlOps is a similar concept to DevOps but applicable to the development and delivery of ML based solutions. The automation of the steps in a ML pipeline defines the maturity of the ML process, reflecting the velocity of training new models given new data or training new models given new implementations. An ML system is a software system that can support development, provide continuous integration and continuous delivery apply to help guarantee that one can reliably build and operate ML systems at scale. The main objective of this thesis are to support the creation of an integrated ML system with an archi tecture that provides the ability to be continuously operated in a production-like environment. Furthermore, a concept to evaluate the performance of algorithms shall be devised and implemented. The end goal is to improve and accelerate the ML development lifecycle. To achieve this goal surges the need to define an architecture alongside specifications and the implementation of several automated steps into an existing ML pipeline. To improve and accelerate model development an model engine benchmark tool is devised capable of several features, including the ability to have dashboards for model performance evaluation, an automatic inference engine, performance metrics for the model and a database to store all the computed metrics and metadata. An AI-based system under development provides the case study to develop and validate this architec ture. The current advances of semi-automated driving introduce the need for monitoring systems to scan and detect specific events in the vehicle. Sensor clusters are installed inside the vehicle cabin to feed data to intelligent systems that aim to analyze and red flag certain behaviours that can potentially impact passengers safety and comfort while using the vehicle

Doença de Gorham: caso clínico

ResumoA doença de Gorham, também conhecida por osteólise maciça idiopática, é uma patologia rara, caraterizada por uma proliferação vascular que resulta na destruição e reabsorção da matriz óssea, de etiologia desconhecida. Foi descrita pela primeira vez em 1838 por Jackson, mas foram Gorham e Stout, em 1955, que definiram a doença como uma entidade específica. Com uma apresentação clinica variável, geralmente tem um comportamento progressivo. O tratamento permanece controverso, não há um tratamento padrão. Essa patologia apresenta geralmente um prognóstico favorável. É apresentado um caso de doença de Gorham com envolvimento do quadril esquerdo, num doente do sexo masculino, sem antecedentes de relevo.AbstractGorham's disease, also known as idiopathic massive osteolysis, is a rare pathological condition characterized by vascular proliferation that results in destruction and reabsorption of the bone matrix, of unknown etiology. It was first described by Jackson in 1838, but it was Gorham and Stout, in 1955, who defined this disease as a specific entity. It has variable clinical presentation and generally has progressive behavior. Controversy continues regarding the treatment and there is no standard treatment. This pathological condition generally presents a favorable prognosis. Here, a case of Gorham's disease with involvement of the left hip is presented, in a male patient without relevant antecedents

An agent-based simulator to estimate domestic energy use

Throughout recent years, there has been an increase in the population size, as well as a fast economic growth, which has led to an increase of the energy demand that comes mainly from fossil fuels. In order to reduce the ecological footprint, governments have implemented sustainable measures and it is expected that by 2035 the energy produced from renewable energy sources, such as wind and solar would be responsible for one-third of the energy produced globally. However, since the energy produced from renewable sources is governed by the availability of the respective primary energy source there is often a mismatch between production and demand, which could be solved by adding flexibility on the demand side through demand response (DR). DR programs influence the end-user electricity usage by changing its cost along the time. Under this scenario the user needs to estimate the energy demand and on-site production in advance to plan its energy demand according to the energy price. This work focuses on the development of an agent-based electrical simulator, capable of: (a) estimating the energy demand and on-site generation with a 1-min time resolution for a 24-h period, (b) calculating the energy price for a given scenario, (c) making suggestions on how to maximize the usage of renewable energy produced on-site and to lower the electricity costs by rescheduling the use of certain appliances. The results show that this simulator allows reducing the energy bill by 11% and almost doubling the use of renewable energy produced on-site

Advances in simulated moving bed : new operating modes : new design methodologies and product (FlexSMB-LSRE) development

Tese de doutoramento. Engenharia Química e Biológica. Faculdade de Engenharia. Universidade do Porto. 200

Integration using Oracle SOA suite

Estágio realizado na Wipro RetailTese de mestrado integrado. Engenharia Informática e Computação. Faculdade de Engenharia. Universidade do Porto. 200

O notariado e o registro imobiliário no brasil: breves reflexões

The present study is an analysis of the activities of notaries and the real estate registration in Brazil, having as objects their evolution, the organization, the access and the prospects for new assignments of these extrajudicial activities, to legal certainty