49 resultados para Polytopic uncertainty


Relevância:

10.00% 10.00%

Publicador:

Resumo:

This study centers on the assessment of psychological value of guarantees in pension products and the behavior biases associated with choice. When a guarantee on a product increases from 99% to 99,5% less than half of respondents show willingness to pay in contrast with 73% when going from 99,5% to 100%. Out of 105 respondents, 55 show that their choices concerning pension products are inconsistent with classic utility theory. Financial background proves insignificant thus pointing to behavioral biases. As individuals make choices that leave them worse-off, we argue that pension plan design would highly benefit from public policy interventions.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Nas últimas décadas, as empresas têm sido sujeitas a uma maior concorrência, ao desenvolvimento tecnológico mais acelerado e a novos desafios no que respeita à qualidade. A Metrologia deverá assim acompanhar estas tendências do mercado. O Departamento de Metrologia (DMET) do Instituto Português da Qualidade, I.P. (IPQ) tem vindo a desenvolver esforços significativos que visam a melhoria contínua das técnicas e dos processos de medição e de calibração realizados nos laboratórios. A presente dissertação de mestrado foi realizada no Laboratório de Volume e Caudal (LVC) do DMET. Os objetivos iniciais do trabalho centraram-se na caraterização metrológica de contadores de fluidos, tendo como base a medição do caudal, utilizando como método de referência o método gravimétrico. De forma a validar o sistema de medição foram realizados ensaios entre 1 mL/h a 100 mL/h, em condições de reprodutibilidade, com dois sistemas padrão distintos de acordo com o caudal a ensaiar. Em todos os ensaios efetuados foi necessário monitorizar as condições ambientais, i.e. temperatura, pressão atmosférica, humidade relativa e a temperatura do líquido padrão, para a aplicação das correções necessárias. Outro feito importante foi a caraterização das fontes de incerteza, que permitiram caraterizar o resultado das medições. A metodologia utilizada para a avaliação e para a estimativa da incerteza de medição encontra-se descrita no Guide to the Expression of Uncertainty in Measurement (GUM). Neste projeto foram contempladas fontes de incerteza como as associadas à evaporação, à impulsão do tubo, à resolução da balança, entre outras. Com os resultados obtidos foi possível elaborar um procedimento técnico para a Calibração de Caudalímetros de Líquidos. Os resultados obtidos permitiram garantir a rastreabilidade das medições de caudal de líquidos ao SI, essencial para a calibração de equipamentos no Laboratório Nacional de Metrologia (LNM) do IPQ, nomeadamente para micro caudalímetros no intervalo de medição entre 0,12 mL/h e 600 mL/h.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Both culture coverage and digital journalism are contemporary phenomena that have undergone several transformations within a short period of time. Whenever the media enters a period of uncertainty such as the present one, there is an attempt to innovate in order to seek sustainability, skip the crisis or find a new public. This indicates that there are new trends to be understood and explored, i.e., how are media innovating in a digital environment? Not only does the professional debate about the future of journalism justify the need to explore the issue, but so do the academic approaches to cultural journalism. However, none of the studies so far have considered innovation as a motto or driver and tried to explain how the media are covering culture, achieving sustainability and engaging with the readers in a digital environment. This research examines how European media which specialize in culture or have an important cultural section are innovating in a digital environment. Specifically, we see how these innovation strategies are being taken in relation to the approach to culture and dominant cultural areas, editorial models, the use of digital tools for telling stories, overall brand positioning and extensions, engagement with the public and business models. We conducted a mixed methods study combining case studies of four media projects, which integrates qualitative web features and content analysis, with quantitative web content analysis. Two major general-interest journalistic brands which started as physical newspapers – The Guardian (London, UK) and Público (Lisbon, Portugal) – a magazine specialized in international affairs, culture and design – Monocle (London, UK) – and a native digital media project that was launched by a cultural organization – Notodo, by La Fábrica – were the four case studies chosen. Findings suggest, on one hand, that we are witnessing a paradigm shift in culture coverage in a digital environment, challenging traditional boundaries related to cultural themes and scope, angles, genres, content format and delivery, engagement and business models. Innovation in the four case studies lies especially along the product dimensions (format and content), brand positioning and process (business model and ways to engage with users). On the other hand, there are still perennial values that are crucial to innovation and sustainability, such as commitment to journalism, consistency (to the reader, to brand extensions and to the advertiser), intelligent differentiation and the capability of knowing what innovation means and how it can be applied, since this thesis also confirms that one formula doesn´t suit all. Changing minds, exceeding cultural inertia and optimizing the memory of the websites, looking at them as living, organic bodies, which continuously interact with the readers in many different ways, and not as a closed collection of articles, are still the main challenges for some media.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Nowadays, organizations face a constant need for adaptability, increasing the importance of change management. Our study focuses of how empowering leadership influences intentions to resist future changes, mediated by the effects of psychological and structural empowerment. From the responses of the two questionnaires (N1=230; Ntf=113), we found that empowering leadership fosters psychological and structural empowerment. Structural empowerment was the main driver in reducing intentions to resist future change when an employee has high organization-based self-esteem. Our findings add to the literature by examining how we can anticipate and manage change under an empowering context, building on social exchange and uncertainty reduction theories