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Search Results: 1 - 10 of 226 matches for " Lasse Loepfe "
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Towards a Proper Assignment of Systemic Risk: The Combined Roles of Network Topology and Shock Characteristics
Lasse Loepfe, Antonio Cabrales, Angel Sánchez
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077526
Abstract: The 2007-2008 financial crisis solidified the consensus among policymakers that a macro-prudential approach to regulation and supervision should be adopted. The currently preferred policy option is the regulation of capital requirements, with the main focus on combating procyclicality and on identifying the banks that have a high systemic importance, those that are “too big to fail”. Here we argue that the concept of systemic risk should include the analysis of the system as a whole and we explore systematically the most important properties for policy purposes of networks topology on resistance to shocks. In a thorough study going from analytical models to empirical data, we show two sharp transitions from safe to risky regimes: 1) diversification becomes harmful with just a small fraction (~2%) of the shocks sampled from a fat tailed shock distributions and 2) when large shocks are present a critical link density exists where an effective giant cluster forms and most firms become vulnerable. This threshold depends on the network topology, especially on modularity. Firm size heterogeneity has important but diverse effects that are heavily dependent on shock characteristics. Similarly, degree heterogeneity increases vulnerability only when shocks are directed at the most connected firms. Furthermore, by studying the structure of the core of the transnational corporation network from real data, we show that its stability could be clearly increased by removing some of the links with highest centrality betweeness. Our results provide a novel insight and arguments for policy makers to focus surveillance on the connections between firms, in addition to capital requirements directed at the nodes.
Two thresholds determine climatic control of forest-fire size in Europe
L. Loepfe,A. Rodrigo,F. Lloret
Biogeosciences Discussions , 2012, DOI: 10.5194/bgd-9-9065-2012
Abstract: Fire weather indices predict fire extent from meteorological conditions assuming a monotonic function; this approach is frequently used to predict future fire patterns under climate change scenarios using linear extrapolation. However, the relationship between weather and fire extent may potentially depend on the existence of fuel humidity thresholds above which this relationship changes dramatically, challenging this statistical approach. Here we combine the continuous and the threshold approaches to analyze satellite-detected fires in Europe during 2001–2010 in relation to meteorological conditions, showing that fire size response to increasing dryness follows a ramp function, i.e. with two plateaus separated by a phase of monotonic increase. This study confirms that at a continental and a high-resolution temporal scales, large fires are very unlikely to occur under moist conditions, but it also reveals that fire size stops to be controlled by fuel humidity above a given threshold of dryness. Thus, fuel humidity control only applies when fire is not limited by other factors such as fuel load, as large fires are virtually absent in dry regions with less than 500 mm of average annual rainfall, i.e. where fuel amount is insufficient. In regions with sufficient fuel, other factors such as fire suppression or fuel discontinuity can impede large fires even under very dry weather conditions. These findings are relevant under current climatic trends in which the fire season length, in terms of number of days with DC (drought code) values above the observed thresholds (break points), is increasing in many parts of the Mediterranean, while it is decreasing in Eastern Europe and remains unchanged in Central Europe.
Pseudodifferential operators on -modulation spaces
Lasse Borup
Journal of Function Spaces and Applications , 2004, DOI: 10.1155/2004/621924
Abstract: We study expansions of pseudodifferential operators from the Hörmander class in a special family of functions called brushlets. We prove that such operators have a sparse representation in a brushlet system. Using this sparsity, we show that a pseudodifferential operator extends to a bounded operator between α-modulation spaces. These spaces were introduced by Gröbner in [15]. They are, in some sense, intermediate spaces between the classical Besov and Modulation spaces.
The Price of Anarchy for Network Formation in an Adversary Model
Lasse Kliemann
Games , 2011, DOI: 10.3390/g2030302
Abstract: We study network formation with n players and link cost α > 0. After the network is built, an adversary randomly deletes one link according to a certain probability distribution. Cost for player? ν incorporates the expected number of players to which? ν will become disconnected. We focus on unilateral link formation and Nash equilibrium. We show existence of Nash equilibria and a price of stability of 1 + ο(1) under moderate assumptions on the adversary and n ≥ 9. We prove bounds on the price of anarchy for two special adversaries: one removes a link chosen uniformly at random, while the other removes a link that causes a maximum number of player pairs to be separated. We show an Ο(1) bound on the price of anarchy for both adversaries, the constant being bounded by 15 + ο(1) and 9 + ο(1), respectively.
Investigating negotiated treatment goals as a tool to facilitate collaboration between conventional and complementary practitioners in the treatment of people with Multiple Sclerosis
Lasse Skovgaard
International Journal of Integrated Care , 2011,
Abstract:
Potentials and barriers in cooperation between conventional and complementary practitioners at a Danish Multiple Sclerosis Hospital
Lasse Skovgaard
International Journal of Integrated Care , 2011,
Abstract:
A thermodynamic model of sliding friction
Lasse Makkonen
AIP Advances , 2012, DOI: 10.1063/1.3699027
Abstract: A first principles thermodynamic model of sliding friction is derived. The model predictions are in agreement with the observed friction laws both in macro- and nanoscale. When applied to calculating the friction coefficient the model provides a quantitative agreement with recent atomic force microscopy measurements on a number of materials.
Rhetoric across the Humanities: Aristotelian Rhetor-Ethics and the Forman Kinship of Art and Literature
Lasse Hodne
Nordlit : Tidsskrift i litteratur og kultur , 1999,
Abstract:
Rhetoric across the Humanities: Aristotelian Rhetor-Ethics and the Forman Kinship of Art and Literature
Lasse Hodne
Nordlit : Tidsskrift i litteratur og kultur , 1999,
Abstract:
El campoesino como concepto analítico
Lasse Krantz
Nueva antropología , 1977,
Abstract:
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