Erik Jørgensen

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A general problem in relation to application of Markov decision processes to real world problems is the curse of dimensionality, since the size of the state space grows to prohibitive levels when information on all relevant traits of the system being modeled are included. In herd management, we face a hierarchy of decisions made at different levels with(More)
In agriculture Markov decision processes (MDPs) with finite state and action space are often used to model sequential decision making over time. For instance, states in the process represent possible levels of traits of the animal and transition probabilities are based on biological models estimated from data collected from the animal or herd. State space(More)
Latent class analysis to assess the sensitivity and specificity of a diagnostic test can be carried out under different assumptions. An often applied set of assumptions is known as the Hui-Walter paradigm, which essentially states that: (i) the population is divided into two or more populations in which two or more tests are evaluated under assumption that(More)
In this paper, we introduce a novel approach to estimate the illumination and reflectance of an image. The approach is based on illumination-reflectance model and wavelet theory. We use a homomorphic wavelet filter (HWF) and define a wavelet quotient image (WQI) model based on dyadic wavelet transform. The illumination and reflectance components are(More)
AIMS Increased plasma concentrations of B-type natriuretic peptide (BNP) and its precursor (proBNP) provide important prognostic information in patients presenting with acute coronary syndromes. Although a majority of these patients undergo early invasive assessment, the effects of coronary angiography per se on plasma BNP and proBNP concentrations are not(More)
It has been twelve years since Alexander Wendt's article on the agent-structure problem signaled the advent of a self-conscious 'constructivist' theoretical approach to the study of world politics (Wendt 1987). Wendt, to be sure, has consistently presented constructivism not as an international relations theory, but as an ontology – a social theory. Yet he(More)
  • Kasper Kyhl, Niels Vejlstrup, Jacob Lønborg, Marek Treiman, Kiril Aleksov Ahtarovski, Steffen Helqvist +9 others
  • 2015
PURPOSE Left atrial (LA) volume is a strong prognostic predictor in patients following ST-segment elevation myocardial infarction (STEMI). However, the change in LA volume over time (LA remodelling) following STEMI has been scarcely studied. We sought to identify predictors for LA remodelling and to evaluate the prognostic importance of LA remodelling. (More)
  • Ida Gustafsson, Anders Hvelplund, Kim Wadt Hansen, Søren Galatius, Mette Madsen, Jan Skov Jensen +6 others
  • 2015
BACKGROUND Guidelines recommend an early invasive strategy for patients with diabetes with acute coronary syndromes (ACS). We investigated if patients with diabetes with ACS are offered coronary angiography (CAG) and revascularisation to the same extent as patients without diabetes. METHODS AND RESULTS The study is a nationwide cohort study linking Danish(More)