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Other participants at the EMQN Best Practice Meeting and/or at the electronic discussions thereafter were Isabel Alonso, Anna Andersson, David Barton, Nazli Bazac, Kyproula Christodoulou, Luı́s Correia, Mark Davis, Mary Davis, Rob Elles, Marina Frontali, Javier Garcia-Planells, Paola Giunti, Petra Hämäläinen, Jenni Jonasson, Outi Kamarainen, Nina Larsson,(More)
  • Fernando Miguel Pais, Graça Lobo, +39 authors Donna Eiskamp
  • 2000
Dissertação apresentada para obtenção do Grau de Doutor em Engenharia do Ambiente, ABSTRACT Genetic algorithms (GAs) have been used to solve difficult optimization problems in a number of fields. One of the advantages of these algorithms is that they operate well even in domains where little is known, thus giving the GA the flavor of a general purpose(More)
OBJECTIVE We set out to determine whether a coronary artery calcium (CAC) score of zero on computed tomography (CT) would predict a normal myocardial perfusion positron emission tomography (PET) in a population mostly at intermediate pretest likelihood of coronary artery disease (CAD). METHODS We enrolled 206 outpatients (36% men, mean age 60 ± 13 years)(More)
BACKGROUND The relationship between coronary artery disease (CAD) and dyslipidemia in acute coronary syndromes has been rarely demonstrated in clinical and epidemiological studies. OBJECTIVE To evaluate the association between lipid profile and severity of CAD in patients with acute coronary syndrome without ST-segment elevation. METHODS In this(More)
This report attempts to shed light to the fundamental concepts behind the stability of Multi-Agent Systems. We view the system as a discrete time Markov chain with a potentially unknown transitional probability distribution. The system will be considered to be stable when it has converged to an equilibrium distribution. Faced with the non-trivial task of(More)
This paper proposes a model for trail detection and tracking that builds upon the observation that trails are salient structures in the robot's visual field. Due to the complexity of natural environments, the straightforward application of bottom-up visual saliency models is not sufficiently robust to predict the location of trails. As for other detection(More)
Anecdotal evidence suggests that the dividend policy of German firms is more flexible than the one of their Anglo-American counterparts. This paper analyses the decision to change the dividend for a panel of 221 German firms from 1984 to 1994. The choice of the period of study is motivated by the fact that at the start of this period there was an economic(More)
This article presents a constraint-based behavioural architecture for low-level safe navigation, the Survival Kit. Instead of approaching the problem by customising a generic Behaviour-Based architecture, the Survival Kit embodies a dedicated semantics for safe navigation, which augments its expressiveness for the task. An instantiation of the architecture(More)
Magnetic resonance imaging (MRI) may be an excellent tool to define atherosclerotic plaque composition, but surface MRI (SMRI) suffers from a low signal-to-noise ratio and low resolution of arterial images. Intravascular MRI (IVMRI) represents a potential solution for acquiring high-quality in vivo images of atherosclerotic plaques. Isolated segments of 11(More)
Potentially important diagnostic information about atherosclerosis can be obtained by using magnetic resonance imaging and spectroscopy techniques. Because critical vessels such as the aorta, coronary arteries, and renal arteries are not near the surface of the body, surface coils are not adequate to increase the data quality to desired levels. A few(More)