Simulation of offshore wind system with three-level converters: HVDC power transmission in cloud scope

This paper is on a simulation for offshore wind systems in deep water under cloud scope. The system is equipped with a permanent magnet synchronous generator and a full-power three-level converter, converting the electric energy at variable frequency in one at constant frequency. The control strategies for the three-level are based on proportional integral controllers. The electric energy is injected through a HVDC transmission submarine cable into the grid. The drive train is modeled by a three-mass model taking into account the resistant stiffness torque, structure and tower in the deep water due to the moving surface elevation. Conclusions are taken on the influence of the moving surface on the energy conversion. © IFIP International Federation for Information Processing 2015.

Light memory operation based on a double pin SiC device

Experimental optoelectronic characterization of a p-i'(a-SiC:H)-n/pi(a-Si:H)-n heterostructure with low conductivity doped layers shows the feasibility of tailoring channel bandwidth and wavelength by optical bias through back and front side illumination. Front background enhances light-to-dark sensitivity of the long and medium wavelength range, and strongly quenches the others. Back violet background enhances the magnitude in short wavelength range and reduces the others. Experiments have three distinct programmed time slots: control, hibernation and data. Throughout the control time slot steady light wavelengths illuminate either or both sides of the device, followed by the hibernation without any background illumination. The third time slot allows a programmable sequence of different wavelengths with an impulse frequency of 6000Hz to shine upon the sensor. Results show that the control time slot illumination has an influence on the data time slot which is used as a volatile memory with the set, reset logical functions. © IFIP International Federation for Information Processing 2015.

Revisão, aplicação e avaliação dos mercados eletrónicos - emarket

Os mercados eletrónicos são sistemas de informação (SI) utilizados por várias entidades organizacionais distintas dentro de um ou vários níveis em termos das cadeias de valor económico (Journal Electronic Markets, 2012). Segundo (Bakos, 1998) têm um papel central na economia, facilitando a troca de informações, produtos, serviços e pagamentos. Durante o processo, é criado valor económico para o comprador, fornecedor, intermediários do mercado e para a sociedade em geral. O comércio eletrónico é o ato de realizar um qualquer tipo de negócio através de uma via eletrónica e é constituído por modelos diversificados onde se destacam o Business to Business (B2B) e o Business to Consumer (B2C). O modelo B2B possui uma quota de 90 % de todo o comércio, sendo esse sucesso intrinsecamente relacionado em grande parte às vantagens que as suas plataformas oferecem às empresas que inseridas nelas (Anacom, 2004). O âmbito principal deste trabalho é o estudo dos B2B, tendo sido para tal definidos os seguintes objetivos: Realizar a identificação do estado atual bem como a evolução dos mercados B2B em Portugal; Caraterização das funcionalidades das plataformas que atuam no tecido nacional e por fim fazer a criação de um conjunto de orientações de apoio a empresas que desejam fazer a inserção nestes mercados. Para serem alcançados os objetivos propostos na dissertação, foram inquiridas várias organizações ao mesmo tempo que foi realizada uma pesquisa de temas e artigos relacionados com os mercados eletrónicos e plataformas B2B, recorrendo a sites como a B-On.pt, e utilizando o motor de busca Google. Este relatório apresenta a seguinte estrutura: No capítulo 1 é apresentada a introdução teórica das matérias apresentadas nos capítulos seguintes; O capítulo 2 é centrado no comércio eletrónico, definições mais comuns e são demonstrados os modelos mais preponderantes do comércio eletrónico; No capítulo 3 são expostas todas as vertentes do modelo B2B, as principais plataformas B2B a atuar no tecido nacional, as suas funcionalidades e modo de operação bem como uma apresentação das principais plataformas a nível mundial; No capítulo 4 são apresentados um conjunto de tópicos de auxílio a empresas que desejem fazer a sua inserção neste tipo de mercados; Por último são descritas as principais conclusões retiradas na realização da dissertação. Em suma, este trabalho reúne um conjunto de dados e orientações úteis, decorrentes do estudo realizado de auxílio a empresas a aderirem aos mercados eletrónicos, visto ser uma abordagem promissora para as organizações.

Feature Extraction in Densely Sensed Environments: Extensions to Multiple Broadcast Domains

The vision of the Internet of Things (IoT) includes large and dense deployment of interconnected smart sensing and monitoring devices. This vast deployment necessitates collection and processing of large volume of measurement data. However, collecting all the measured data from individual devices on such a scale may be impractical and time consuming. Moreover, processing these measurements requires complex algorithms to extract useful information. Thus, it becomes imperative to devise distributed information processing mechanisms that identify application-specific features in a timely manner and with a low overhead. In this article, we present a feature extraction mechanism for dense networks that takes advantage of dominance-based medium access control (MAC) protocols to (i) efficiently obtain global extrema of the sensed quantities, (ii) extract local extrema, and (iii) detect the boundaries of events, by using simple transforms that nodes employ on their local data. We extend our results for a large dense network with multiple broadcast domains (MBD). We discuss and compare two approaches for addressing the challenges with MBD and we show through extensive evaluations that our proposed distributed MBD approach is fast and efficient at retrieving the most valuable measurements, independent of the number sensor nodes in the network.

Emotion-oriented interventions for environment and the facilitation of pro-environmental behavior

Dissertação para obtenção do Grau de Doutor em Ambiente, pela Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia

On the cloud deployment of a session abstraction for service/data aggregation

Dissertação para obtenção do Grau de Mestre em Engenharia Informática

O acesso ao tratamento em saúde Mental na microregião de Itajubá/MG-Brasil

RESUMO: A integração da saúde mental à atenção básica é a recomendação feita para facilitar o acesso ao tratamento. A pesquisa teve por objetivo mapear e analisar os facilitadores e as barreiras ao acesso ao tratamento em saúde mental da Microrregião de Itajubá, estado de Minas Gerais, Brasil, composta por 15 municípios. A metodologia pautou-se na triangulação dos métodos, combinando a abordagem quantitativa e qualitativa de pesquisa. Para tal foi feito o mapeamento da capacidade instalada dos recursos existentes e identificação das principais lacunas com base nos parâmetros da saúde pública, a partir de roteiros de entrevistas e grupos focais com os principais atores sociais implicados. Constatou-se que o maior facilitador ao acesso ao tratamento tem sido a atuação das equipes de PSF (Programa Saúde da Família), que atuam diretamente nas comunidades. Outros facilitadores foram: a atuação dos CRAS (Centro de Referência de Assistência Social); a existência de um CAPS (Centro de Atenção Psicossocial), embora não credenciado ao SUS (Sistema Único de Saúde); Colegiados de Saúde Mental que promovem discussões, informação, educação, e pressionam os municípios para a implantação de serviços de saúde mental. A falta de “vontade política”, isto é, uma intervenção mais clara da gestão pública da saúde, com estabelecimento de prioridades para prover a ampliação do acesso, foi identificada como a maior barreira a ser enfrentada na microrregião, especialmente por falta de organização e planejamento das ações em saúde mental. Serviços que trabalham de forma isolada, sem a construção de uma rede; pouca participação política dos usuários dos serviços de saúde mental; e falta de recursos humanos, e profissionais pouco preparados para a função compõem as outras barreiras de acesso. Vê-se que diante dos facilitadores e barreiras expostos é preciso que os municípios realizem um levantamento sistemático, a fim de criar um plano de ação em saúde mental para compartilhar informações, recursos, serviços, disponibilidade, disposição e ações em rede.-------------- ABSTRACT: Integrating mental health care in primary-care services is recommended in order to improve access to treatment. Access to mental health treatment has been a worldwide debated theme. In Brazil, with the Psychiatric Reform, there has been a change of paradigm in the way of treating persons with mental disorders. Various health devices were created, building a net of treatment and care that replaces the asylum system and where human rights are respected and defended and the offered treatment is the closest possible to their social space. The research aims to map and analyse the barriers and the facilitators to mental health treatment in the micro-region of Itajubá, state of Minas Gerais/Brazil, made up of 15 counties. The methodology was based on the triangulation of methods, combining quantitative and qualitative research. For that, a mapping of the installed capacity of the existent resource was carried out; identification of the main voids based on the parameters of public health through scripts of interviews and focus groups with the social actors involved. It was found that the main facilitator to treatment has been the performance of PSF, who act directly in the communities. Other facilitators also stand out: the work of CRAS; the existence of CAPS, although not accredited to SUS; Mental Health Collegiate, promoting discussions, information, education, and forcing pressure on the counties for the implantation of mental health services. The lack of political will was identified as the major barrier to be faced in the micro-region, especially due to lack of organization and planning in the actions towards mental health. The services working isolatedly, without a communication net, and the lack of human resources as well as poorly prepared professional, are the main difficulties faced by access to mental health treatment. Becomes clear that the counties need to undertake a systematic survey towards creating a plan of action in mental health, in order to share information, resources, services, availability, disposition and networking.

Trans-Synaptic Signaling by Activity-Dependent Cleavage of Neuroligin-1

Throughout the brain, patterns of activity in postsynaptic neurons influence the properties of synaptic inputs. Such feedback regulation is central to neural network stability that underlies proper information processing and feature representation in the central nervous system. At the cellular level, tight coupling of presynaptic and postsynaptic function is fundamental to neural computation and synaptic plasticity. The cohort of protein complexes at the pre and postsynaptic membrane allows for tight synapse-specific segregation and integration of diverse molecular and electrical signals.(...)

Avaliação do desempenho de equipas em serviços de sistemas de informação

Dissertação de mestrado integrado em Engenharia e Gestão de Sistemas de Informação

Repeated assessment and practice effects of the written symbol digit modalities test using a short inter-test interval

The Symbol Digit Modalities Test (SDMT) is a widely used instrument to assess information processing speed, attention, visual scanning, and tracking. Considering that repeated evaluations are a common need in neuropsychological assessment routines, we explored test–retest reliability and practice effects of two alternate SDMT forms with a short inter-assessment interval. A total of 123 university students completed the written SDMT version in two different time points separated by a 150-min interval. Half of the participants accomplished the same form in both occasions, while the other half filled different forms. Overall, reasonable test–retest reliabilities were found (r = .70), and the subjects that completed the same form revealed significant practice effects (p < .001, dz = 1.61), which were almost non-existent in those filling different forms. These forms were found to be moderately reliable and to elicit a similar performance across participants, suggesting their utility in repeated cognitive assessments when brief inter-assessment intervals are required.

Do stars govern our actions? astrocyte involvement in rodent behavior

Do stars govern our actions? Astrocyte involvement in rodent behavior

SOFHIA: a CAD environment to design digital control systems

"Series Title: IFIP - The International Federation for Information Processing, ISSN 1868-4238"

Analyse der Informationsverarbeitung in CHL1-defizienten Mäusen mittels metabolischer Markierung, Expressionsstudien der Immediate-Early-Gene c-fos und arg3.1/arc sowie verhaltensbiologischer Tests

Close homolog of L1, neural cell recognition molecules, c-fos, arg3.1, arc, immediat early genes, novelty, information processing, behavioral tests

Men perform comparably to women in a perspective taking task after administration of intranasal oxytocin but not after placebo

Oxytocin (OT) is thought to play an important role in human interpersonal information processing and behavior. By inference, OT should facilitate empathic responding, i.e. the ability to feel for others and to take their perspective. In two independent double-blind, placebo-controlled between-subjects studies, we assessed the effect of intranasally administered OT on affective empathy and perspective taking, whilst also examining potential sex differences (e.g., women being more empathic than men). In study 1, we provided 96 participants (48 men) with an empathy scenario and recorded self reports of empathic reactions to the scenario, while in study 2, a sample of 120 individuals (60 men) performed a computerized implicit perspective taking task. Whilst results from Study 1 showed no influence of OT on affective empathy, we found in Study 2 that OT exerted an effect on perspective taking ability in men. More specifically, men responded faster than women in the placebo group but they responded as slowly as women in the OT group. We conjecture that men in the OT group adopted a social perspective taking strategy, such as did women in both groups, but not men in the placebo group. On the basis of results across both studies, we suggest that self-report measures (such as used in Study 1) might be less sensitive to OT effects than more implicit measures of empathy such as that used in Study 2. If these assumptions are confirmed, one could infer that OT effects on empathic responses are more pronounced in men than women, and that any such effect is best studied using more implicit measures of empathy rather than explicit self-report measures.

What do we know about gliotransmitter release from astrocytes?

Astrocytes participate in information processing by actively modulating synaptic properties via gliotransmitter release. Various mechanisms of astrocytic release have been reported, including release from storage organelles via exocytosis and release from the cytosol via plasma membrane ion channels and pumps. It is still not fully clear which mechanisms operate under which conditions, but some of them, being Ca(2+)-regulated, may be physiologically relevant. The properties of Ca(2+)-dependent transmitter release via exocytosis or via ion channels are different and expected to produce different extracellular transmitter concentrations over time and to have distinct functional consequences. The molecular aspects of these two release pathways are still under active investigation. Here, we discuss the existing morphological and functional evidence in support of either of them. Transgenic mouse models, specific antagonists and localization studies have provided insight into regulated exocytosis, albeit not in a systematic fashion. Even more remains to be uncovered about the details of channel-mediated release. Better functional tools and improved ultrastructural approaches are needed in order fully to define specific modalities and effects of astrocytic gliotransmitter release pathways.