Autonomous localization of a radio source is addressed, in the context of autonomous charging for drones in indoor environments. A radio beacon will be the only input used by the robot to navigate to an unknown charging station, at an unknown area. Previous proposed algorithms used frontier-based exploration and the measured RSS to compute the direction to the source. The use of Gaussian processes is studied to model the Radio Signal Strength (RSS) distribution and generate an estimation of the gradient. This gradient was also incorporated into a frontier exploration algorithm and was compared with the proposed algorithm. It was found that the usefulness of the Gaussian process model depended on the distribution of the RSS samples. If the robot had no prior samples of the RSS, then the gradient-assisted solution performed better. Instead, if the robot had some prior knowledge of the RSS distribution, then the Gaussian process model yields a better performance. / Autonom utforskning av en radiokälla behandlas, i samband med autonom laddning för drönare i inomhusmiljöer. En radiofyr kommer att vara den enda information som roboten använder för att navigera till en laddningsstation i ett okänt område. Tidigare föreslagna algoritmer använde gränsbaserad undersökning och den uppmätta RSS:en för att beräkna källans riktning. Användning av Gaussiska processer studeras för att modellera RSS-distributionen och generera en uppskattning av gradienten. Denna gradient införlivades också i en gränsutforskningsalgoritm och jämfördes med den föreslagna algoritmen. Det visade sig att användningen av den gaussiska processmodellen berodde på distributionen av RSS-proverna. Om roboten inte hade några tidigare prover av RSS, presterade den gradientassisterade lösningen bättre. Istället, om roboten hade några prover av RSS (till exempel om den utfört en annan uppgift på någon region i kartan), ger Gaussiska processmodellen bättre prestanda.

Yes / This research article analyzed the self-preserving behaviour of wall-wake region of a circular pipe mounted horizontally over a flat rigid sand bed in a shallow flow in terms of mean velocity, RSS, and turbulence intensities. The study aims to investigate self-preservation using appropriate length and velocity scales.in addition to that wall-normal distributions of the third-order correlations along the streamwise direction in the wake region are analyzed. An ADV probe was used to record the three-dimensional instantaneous velocities for four different hydraulic and physical conditions corresponding to four cylinder Reynolds numbers. The results revealed that the streamwise velocity deficits, RSS deficits, and turbulence intensities deficits distributions displayed good collapse on a narrow band when they were non-dimensionalized by their respective maximum deficits. The wall-normal distance was non-dimensionalized by the half velocity profile width for velocity distributions, while the half RSS profile width was used in the case of the RSS deficits and turbulence intensities deficits distributions. The results indicate the self-preserving nature of streamwise velocity, RSS, and turbulence intensities in the wall-wake region of the pipe. The third-order correlations distributions indicate that sweep is the dominant bursting event in the near-bed zone. At the same time, ejection is the dominant bursting event in the region above the cylinder height.

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Submitted by Nadir Basilio (nadirsb@uninove.br) on 2016-06-23T14:59:55Z No. of bitstreams: 1 Fabiana Dos Santos Pereira Campos.pdf: 2460024 bytes, checksum: 6317b67817bb3e38ae9a77cb0716aab8 (MD5) / Made available in DSpace on 2016-06-23T14:59:55Z (GMT). No. of bitstreams: 1 Fabiana Dos Santos Pereira Campos.pdf: 2460024 bytes, checksum: 6317b67817bb3e38ae9a77cb0716aab8 (MD5) Previous issue date: 2015-11-03 / The objective of the research was to evaluate the performance of management of health care waste systems in hospitals organizations, in view of their managers. Indicators were created and developed a performance evaluation tool for the management of healthcare waste integrated with environmental management systems, occupational health and safety; to further identify the predominant model RSS management in each organization investigated. We used the method of multiple case study, through exploratory research, qualitative in nature. The main sources of evidence in the triangulation of data were: a semi-structured interview and the identification form the predominant model for assessing the RSS management systems in the hospital; structured questionnaires; documentary research, and direct non-participant observation conducted in selected health organizations. There was a content analysis, which had the category and subcategory dimensions (operational, administrative, environmental and financial) and parameters of the assessment tool proposed. The results indicated that all hospitals need improvement. The operational dimension presented greater relevance, while the financial dimension is the lowest maturity by limitations on resources. All hospitals investigated were classified as organizations with an RSS management, but need improvement. The RSS management goes beyond the implementation of an ideal management system for the proper management of RSS, as it is also necessary that the individual has commitment and values of citizenship and ethics, responsibility and solidarity in the exercise of their daily activities in this process. It is believed that this evaluation can help improve the GRSS, serving as instrumental for managers assess the management system of the RSS, with the support of prevailing models, favoring strategic decisions to improvements in all worked dimensions in an integrated way. / O objetivo da pesquisa foi avaliar o desempenho dos sistemas de gerenciamento de resíduos de serviços de saúde em organizações hospitalares, na visão de seus gestores. Foram criados indicadores e desenvolvido um instrumento de avaliação de desempenho do gerenciamento de resíduos de serviços de saúde integrado com os sistemas de gestão ambiental, de saúde e segurança ocupacional; para posteriormente identificar o modelo preponderante de gerenciamento de RSS em cada organização investigada. Utilizou-se o método estudo de casos múltiplos, por meio de pesquisa tipo exploratória, de natureza qualitativa. As principais fontes de evidência na triangulação dos dados foram: a entrevista semiestruturada e o formulário de identificação do modelo preponderante para avaliação dos sistemas de gerenciamento de RSS no hospital; os questionários estruturados; a pesquisa documental e a observação direta não participante realizadas nas organizações de saúde selecionadas. Fez-se uma análise de conteúdo, que teve como categoria e subcategoria as dimensões (operacionais, administrativas, ambientais e financeiras) e parâmetros do instrumento de avaliação proposto. Os resultados indicaram que todos os hospitais necessitam de melhorias. A dimensão operacional apresentou maior relevância, enquanto que a dimensão financeira é a de menor maturidade pelas limitações dos recursos. Todos os hospitais pesquisados foram classificados como organizações que possuem um gerenciamento de RSS, mas necessitam aperfeiçoamento. O gerenciamento de RSS vai além da implantação de um sistema de gestão ideal para o manejo adequado dos RSS, pois é necessário também que o indivíduo tenha comprometimento e valores de cidadania e ética, responsabilidade e solidariedade no exercer de suas atividades cotidianas neste processo. Acredita-se que a presente avaliação possa auxiliar na melhoria do GRSS, servindo de instrumental para os gestores avaliarem o sistema de gerenciamento dos RSS, com o apoio dos modelos preponderantes, favorecendo decisões estratégicas, para a melhoria de todas as dimensões trabalhadas de forma integrada.

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Durch die Vielzahl von heterogenen Informationsquellen sehen sich viele Nutzer einer kaum überschaubaren Informationsflut gegenüber. Aus diesem Grund werden durch diese Arbeit die gängigen Nachrichtenformate analysiert und der aktuelle Stand der Technik im Bereich der Nachrichtenaggregatoren dargelegt. Dabei werden diese Analysen immer mit Blick auf die Möglichkeiten einer personalisierten Filterung der Inhalte durchgeführt. Anschließend wird eine im Rahmen dieser Arbeit entstandene Infrastruktur für die Aggregation, personalisierte Filterung und kollaborative Empfehlung von Inhalten aus heterogenen Nachrichtenquellen vorgestellt. Dabei wird detailiert auf die zu Grunde liegenden Konzepte eingegangen und deren praktische Umsetzung beschrieben.