VeranstaltungsortN.2.01Veranstalter Institut für MathematikBeschreibungTitel: Control and stabilization of nonlinear systems with oscillatory dynamicsKurzfassung:This talk addresses the issue of asymptotic behavior of solutions to nonlinearcontrol systems governed by ordinary and partial differential equations.It is assumed that the class of systems under consideration satisfies controllability conditions with unconstrained inputs. In the finite-dimensional case, we propose a family of fast oscillating feedback controls that stabilize the equilibrium with exponential decay rate. The idea of proof is based on an extension of Lyapunov’s direct method and the Chen-Fliess series. A characterization of attractors of infinite-dimensional closed-loop systems is obtained by the invariance principle. These results are applied for the stabilization of nonholonomic systems and mathematical models of controlled flexible structures.Vortragende(r)Prof. Dr. Alexander ZuyevKontaktSenka Haznadar (senka.haznadar@aau.at)

VeranstaltungsortS.2.42Veranstalter Fakultät für Technische WissenschaftenBeschreibungScalable retrieval of high-dimensional feature vectors is an important component of many applications in multimedia and other fields, but also a very challenging problem. In this talk, we discuss the challenges of high-dimensional indexing at scale, and then present two approximate indexing methods designed for large-scale retrieval. We present results from experiments with the two largest feature collections reported in the literature, 28.5 billion SIFT features on a single server and 42.9 billion SIFT features in a distributed setting, and demonstrate an application with interactive retrieval over the 99.2 million images of the YFCC100M collection. Vortragende(r)Björn Thór Jónsson, Associate ProfessorIT University of Copenhagen, DenmarkReykjavik University, IcelandKontaktChristian Timmerer (christian.timmerer@itec.aau.at)