Ulrich Krüger

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This paper generalizes some aspects of polymatroid theory to partially ordered sets. The investigations are mainly based on Faigle and Kern, Submodular Linear Programs on Forests, Mathematical Programming 72 (1996). A slightly modiied concept of submodularity is introduced. As a consequence the main results do not require any assumptions concerning the(More)
In the 2009 European Guidelines on the diagnosis and treatment of pulmonary hypertension (PH), one section covers aspects of pathophysiology, diagnosis and treatment of chronic thromboembolic pulmonary hypertension (CTEPH). The practical implementation of the guidelines for this disease is of crucial importance, because CTEPH is a subset of PH which can(More)
Aim of the study was to evaluate whether late enhancement (LE) in contrast-enhanced MRI can be used to characterize fibrofatty myocardial replacement in patients with arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC). Fifteen patients with suspected ARVC underwent CE-MRI using a 1.5 T scanner. Long and short axis SSFP cine images and(More)
So-called epithelial rests of Malassez are derived from the Hertwig's root sheath and are located in the periodontal ligament, with still unknown functions. Different pathological conditions may lead to proliferation of these otherwise non-proliferative cell clusters. The insulin-like growth factor (IGF) system is an important growth factor system(More)
Chronic venous leg ulcers are common and cause considerable burden of disease for affected patients with significant costs for health care systems worldwide. The complex pathophysiology of chronic venous leg ulcers is still not entirely understood. In addition, reliable pathogenic and/or prognostic parameters are not known. Published data suggest that(More)
BACKGROUND Subcutaneous treprostinil has dose-dependent beneficial effects in patients with severe pulmonary arterial hypertension, but adverse effects like infusion site pain can lead to treatment discontinuation. OBJECTIVES The objective of this study was to evaluate safety, tolerability and clinical effects of a rapid up-titration dosing regimen of(More)
Systemic risk from financial intermediaries (FIs) refers to a negative externality problem which is rife with fallacy of composition type errors. To ‘see’ why seemingly rational behaviour at the level of an individual FI contributes to system wide instability is a nontrivial exercise which requires holistic visualization and modelling techniques. Paradox of(More)
This paper investigates contagion in the German interbank market under the assumption of a stochastic loss given default (LGD). We combine a unique data set about the LGD of interbank loans with detailed data about interbank exposures. We find that the frequency distribution of the LGD is markedly U-shaped. Our simulations show that contagion in the German(More)
Das Platypnea-Orthodeoxie-Syndrom mit zugrundeliegendem interatrialem Shunt und rechts-links Shunt ist eine seltene Ursache und bedarf einer differentierten Abklärung. Berichtet wird über einen 62-jährigen Patienten mit seit 6 Monaten progredienter Dyspnoe (NYHA III) im Stehen und Belasten bei Beschwerdelinderung im Liegen. Vorbekannt ist eine Pneumektomie(More)
Critics claim that capital requirements can exacerbate credit cycles by restricting lending in an economic downturn. The introduction of Basel 2, in particular, has led to concerns that risksensitive capital charges are highly correlated with the business cycle. The Basel Committee is contemplating a revision of the Basel Accord by introducing(More)