61,303 research outputs found
Evolutionary computation in dynamic and uncertain environments
This book can be accessed from the link below - Copyright @ 2007 Springer-Verla
Editorial to special issue on evolutionary computation in dynamic and uncertain environments
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Collusion with private and aggregate information
This paper considers three linear asymmetric oligopoly models with (i) a representative consumer, (ii) horizontal differentiation and (iii) vertical differentiation. We show that firms could maximize the joint-profit only based on private and aggregate information. They can choose the ācorrectā colluding prices without knowing the demand or profit function. The collusive outcome is a natural focal point despite firms are asymmetric. Collusion can be incentive compatible even though individual actions (prices) are not observed. -- Der Beitrag untersucht drei linear asymmetrische Oligopol-Modelle mit (i) einem reprƤsentativen Verbraucher, (ii) horizontaler Differenzierung und (iii) vertikaler Differenzierung. Es wird gezeigt, daĆ Firmen in der Lage sind, den Gesamtprofit allein auf der Grundlage privater und gemeinschaftlicher Information zu maximieren. Sie kƶnnen zur ārichtigenā Absprache des Preises gelangen, ohne die Nachfrage- oder Gewinn-Funktion zu kennen. Die Absprache stellt einen natĆ¼rlichen Gleichgewichtspunkt dar, ungeachtet asymmetrischer VerhƤltnisse. Die Absprache kann anreizkompatibel sein, auch wenn individuelle Aktionen (Preise) nicht beobachtet werden.
Bounded perturbation resilience of projected scaled gradient methods
We investigate projected scaled gradient (PSG) methods for convex
minimization problems. These methods perform a descent step along a diagonally
scaled gradient direction followed by a feasibility regaining step via
orthogonal projection onto the constraint set. This constitutes a generalized
algorithmic structure that encompasses as special cases the gradient projection
method, the projected Newton method, the projected Landweber-type methods and
the generalized Expectation-Maximization (EM)-type methods. We prove the
convergence of the PSG methods in the presence of bounded perturbations. This
resilience to bounded perturbations is relevant to the ability to apply the
recently developed superiorization methodology to PSG methods, in particular to
the EM algorithm.Comment: Computational Optimization and Applications, accepted for publicatio
Minimal Models for Axion and Neutrino
The PQ mechanism resolving the strong CP problem and the seesaw mechanism
explaining the smallness of neutrino masses may be related in a way that the PQ
symmetry breaking scale and the seesaw scale arise from a common origin.
Depending on how the PQ symmetry and the seesaw mechanism are realized, one has
different predictions on the color and electromagnetic anomalies which could be
tested in the future axion dark matter search experiments. Motivated by this,
we construct various PQ seesaw models which are minimally extended from the
(non-) supersymmetric Standard Model and thus set up different benchmark points
on the axion-photon-photon coupling in comparison with the standard KSVZ and
DFSZ models.Comment: 12 pages and 2 figures, references added, matched with the published
version in PL
Random induced subgraphs of Cayley graphs induced by transpositions
In this paper we study random induced subgraphs of Cayley graphs of the
symmetric group induced by an arbitrary minimal generating set of
transpositions. A random induced subgraph of this Cayley graph is obtained by
selecting permutations with independent probability, . Our main
result is that for any minimal generating set of transpositions, for
probabilities where , a random induced subgraph has a.s. a unique
largest component of size , where
is the survival probability of a specific branching process.Comment: 18 pages, 1 figur
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