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Search Results: 1 - 10 of 1021 matches for " Torsten Roehl "
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Self-organized critical neural networks
Stefan Bornholdt,Torsten Roehl
Quantitative Biology , 2001, DOI: 10.1103/PhysRevE.67.066118
Abstract: A mechanism for self-organization of the degree of connectivity in model neural networks is studied. Network connectivity is regulated locally on the basis of an order parameter of the global dynamics which is estimated from an observable at the single synapse level. This principle is studied in a two-dimensional neural network with randomly wired asymmetric weights. In this class of networks, network connectivity is closely related to a phase transition between ordered and disordered dynamics. A slow topology change is imposed on the network through a local rewiring rule motivated by activity-dependent synaptic development: Neighbor neurons whose activity is correlated, on average develop a new connection while uncorrelated neighbors tend to disconnect. As a result, robust self-organization of the network towards the order disorder transition occurs. Convergence is independent of initial conditions, robust against thermal noise, and does not require fine tuning of parameters.
Stochastic gain in population dynamics
Arne Traulsen,Torsten Roehl,Heinz Georg Schuster
Physics , 2004, DOI: 10.1103/PhysRevLett.93.028701
Abstract: We introduce an extension of the usual replicator dynamics to adaptive learning rates. We show that a population with a dynamic learning rate can gain an increased average payoff in transient phases and can also exploit external noise, leading the system away from the Nash equilibrium, in a reasonance-like fashion. The payoff versus noise curve resembles the signal to noise ratio curve in stochastic resonance. Seen in this broad context, we introduce another mechanism that exploits fluctuations in order to improve properties of the system. Such a mechanism could be of particular interest in economic systems.
ANCA-Associated Vasculitides—An Update  [PDF]
Johanna Kegel, Torsten Kirsch
Health (Health) , 2014, DOI: 10.4236/health.2014.614209
Abstract: Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitides are characterized by destruction of small vessels, granulomatous inflammation of the respiratory tract and necrotizing glomerulonephritis. This review describes the clinical diagnosis and therapy as well as the patho-physiology of ANCA-associated vasculitides with a specific focus on the interplay of ANCAs with activated neutrophils and the deleterious pathophysiological consequences of neutrophil-endothelium interaction.
THE IMPACT OF MACROECONOMIC COUNTRY-SPECIFIC FACTORS ON INTERNATIONAL EXPANSION OF US HOTEL CHAINS
Ljudevit Prani?,Sonia Ketkar,Wesley S. Roehl
Tourismos : an International Multidisciplinary Journal of Tourism , 2011,
Abstract: While our understanding of the issues surrounding foreign direct investment (FDI) in tourism is limited (Endo, 2006), even less is known about the role of FDI and other macroeconomic variables in the lodging segment of the tourism industry. This research fills this gap by examining the population of U.S. hotels with international operations with respect to FDI, Market Interconnectedness and Tourist Flows in foreign countries. Additional examination is performed separately on high-income and middle-income countries. Study findings suggest that Market Interconnectedness is highly significantly and positively correlated with presence of U.S. hotel firms abroad, while FDI and Tourist Flows are not. However, results somewhat differ with respect to high-income and middle-income countries.
THE IMPACT OF MACROECONOMIC COUNTRY-SPECIFIC FACTORS ON INTERNATIONAL EXPANSION OF US HOTEL CHAINS
Ljudevit Prani?,Sonia Ketkar,Wesley S. Roehl
Tourismos : an International Multidisciplinary Journal of Tourism , 2012,
Abstract: While our understanding of the issues surrounding foreign direct investment (FDI) in tourism is limited (Endo, 2006), even less is known about the role of FDI and other macroeconomic variables in the lodging segment of the tourism industry. This research fills this gap by examining the population of U.S. hotels with international operations with respect to FDI, Market Interconnectedness and Tourist Flows in foreign countries. Additional examination is performed separately on high-income and middle-income countries. Study findings suggest that Market Interconnectedness is highly significantly and positively correlated with presence of U.S. hotel firms abroad, while FDI and Tourist Flows are not. However, results somewhat differ with respect to high-income and middle-income countries.
Implications of Building Information Modeling on Interior Design Education: The Impact on Teaching Design Processes
Amy Roehl, MFA,Gayla Jett Shannon, MArch
Journal of Arts and Humanities , 2013,
Abstract: Currently, major shifts occur in design processes effecting business practices for industries involved with designing and delivering the built environment. These changing conditions are a direct result of industry adoption of relatively new technologies called BIM or Building Information Modeling. This review of literature examines implications of these changing processes on interior design education.
Scientific autonomy and planned research: the case of space science
Torsten Wilholt
Poiesis & Praxis , 2006, DOI: 10.1007/s10202-006-0031-6
Abstract: La recherche scientifique assistée par la navigation spatiale a toujours été soumise à un contr le externe comparativement important, et son ordre du jour doit souvent se conformer à des objectifs politiques changeants. Les scientifiques de l’espace peuvent-ils en appeler à l’une ou l’autre forme du principe de liberté de la recherche largement acquis pour revendiquer davantage d’autonomie? Dans cette contribution, la difficile question de l’autonomie au sein de la recherche planifiée est abordée par l’examen de trois arguments qui étayent le principe de la liberté de la recherche de différentes manières. Chaque argument a ses forces et ses limites. Utilisés ensemble, ils servent à démontrer les avantages particuliers de l’autonomie scientifique, mais dans le cas des sciences liées à la navigation spatiale, leur efficacité demeure en fin de compte restreinte. Néanmoins, comme ces arguments mettent en évidence les interactions entre l’autonomie scientifique, le processus démocratique et l’intérêt commun au savoir scientifique, ils font appara tre que la meilleure garantie d’un agenda cohérent et durable des activités scientifiques spatiales peut être assurée par une transparence accrue des décisions de politique scientifiques en faisant intervenir l’opinion publique démocratique.
Dark Matter Annihilation Signals: The Importance of Radiative Corrections
Bringmann, Torsten
High Energy Physics - Phenomenology , 2008,
Abstract: Being able to safely distinguish astrophysical from potential dark matter (DM) annihilation signals is of utmost importance for indirect DM searches. To this end, one has to rely on distinctive -- and unique -- spectral signatures to look for. Internal bremsstrahlung (IB), unavoidable in the presence of charged annihilation products, provides such a signature. In fact, as it generically dominates the gamma-ray spectrum expected from DM annihilations, at high energies, it may well turn out to be more important for indirect DM searches than the traditionally looked-for line signals. As illustrated in some detail, the observation of IB signatures would even allow to distinguish between different DM candidates or to constrain significantly the parameter space of, e.g., neutralino DM. The gamma-ray contributions reported here are therefore of great interest for the already launched Fermi/GLAST satellite and the upcoming new generation of Air Cherenkov Telescope systems like CTA -- which are most sensitive at the high energies where these effects are particularly important. Finally, radiative corrections may even significantly alter the positron spectrum from DM annihilations; an intriguing positron excess recently found by the PAMELA satellite might turn out to be an indication of the peculiar spectral signature expected in that case.
Phenomenology of QCD threshold resummation for gluino pair production at NNLL
Pfoh, Torsten
High Energy Physics - Phenomenology , 2013,
Abstract: We examine the impact of threshold resummation for the inclusive hadronic production cross section of gluino pairs at next-to-next-to-leading-logarithmic accuracy, compared to the exact next-to-leading-order cross section and the next-to-next-to-leading-order approximation. Here, we apply formulas derived recently in the classical Mellin-space formalism. Moreover, we give the analytic input for the alternative momentum-space formalism and discuss the crucial points of the numeric implementation. We find that soft resummation keeps the hadronic cross section close to the fixed next-to-leading-order result.
Commentary on "Expansions for Eigenfunctions and Eigenvalues of large-n Toeplitz Matrices"
Torsten Ehrhardt
Papers in Physics , 2010, DOI: 10.4279/pip.020004
Abstract: A Commentary on the paper by L. P. Kadanoff [Pap. Phys. 2, 020003 (2010)]. Received: 29 September 2010, Accepted: 4 October 2010; Edited by: A. G. Green; DOI: 10.4279/PIP.020004
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