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DTSTART;TZID=Europe/Brussels:20221013T130000
DTEND;TZID=Europe/Brussels:20221013T140000
DTSTAMP:20260509T064636
CREATED:20220913T114110Z
LAST-MODIFIED:20221205T150659Z
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SUMMARY:Jeongjin Lee (University of Namur)
DESCRIPTION:Title: Partial Tail Correlation for Extremes \nAbstract: We develop a method for investigating conditional extremal relationships between variables. We consider an inner product space constructed from transformed-linear combinations of independent regularly varying random variables. By developing theprojection theorem for the inner product space\, we derive the concept of partial tailcorrelation via projection theorem. We show that the partial tail correlation can beunderstood as the inner product of the prediction errors associated with transformed-linear prediction. Similar to Gaussian cases\, we connect partial tail correlation tothe inverse of the inner product matrix and show that a zero in this inverse impliesa partial tail correlation of zero. We develop a hypothesis test for the partial tailcorrelation of zero and demonstrate the performance in a simulation study as well asin two applications: extreme river discharges in the upper Danube basin and highnitrogen dioxide levels in Washington DC. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/jeongjin-lee-university-of-namur/
CATEGORIES:NAXYS Seminar
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DTSTART;TZID=Europe/Brussels:20221024T130000
DTEND;TZID=Europe/Brussels:20221024T140000
DTSTAMP:20260509T064636
CREATED:20221007T065332Z
LAST-MODIFIED:20221205T150731Z
UID:1702-1666616400-1666620000@www.naxys.be
SUMMARY:Hiroya Nakao (Tokyo Institute of Technology\, Japan)
DESCRIPTION:Authors: Yuzuru Kato and Hiroya Nakao* \nTitle: Turing instability in quantum activator–inhibitor systems \nAbstract: We show that Turing instability\, a fundamental mechanism of nonequilibrium self-organization in classical systems\, can also occur in a quantum dissipative system. We propose a quantum-optical parametric oscillator with nonlinear damping as a quantum activator–inhibitor unit\, and numerically demonstrate that a system of two such units can undergo Turing instability when diffusively coupled with each other. The Turing instability induces a pair of nonuniform states that are mixed due to quantum noise. Further performing continuous measurement on the coupled system reveals the nonuniformity caused by the Turing instability. \nReference: Y. Kato and H. Nakao\, “Turing instability in quantum activator-inhibitor systems”\, Sci. Rep. (2022) 12:15573 \nThe seminar will take place in room S07 at the Faculty of Sciences
URL:https://www.naxys.be/event/hiroya-nakao-tokyo-institute-of-technology/
CATEGORIES:NAXYS Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221026T103000
DTEND;TZID=Europe/Brussels:20221026T113000
DTSTAMP:20260509T064636
CREATED:20221020T144038Z
LAST-MODIFIED:20221114T100224Z
UID:1714-1666780200-1666783800@www.naxys.be
SUMMARY:Manu Stalport (Geneva University\, Switzerland)
DESCRIPTION:Title: A calibration of chaos for the refinement of planetary systems \nAbstract: The observed diversity of planetary systems raises questions that challenge the formation and evolution models. A precise knowledge of the systems architectures is key in order to identify the leading processes shaping them. In this presentation\, I will discuss on how the study of chaos can provide a more precise view of the planetary systems. A particular interest is drawn on a numerical chaos indicator\, namely the Numerical Analysis of Fundamental Frequencies (NAFF\, J. Laskar)\, and its link with orbital instability. Combining the lessons learned together with a Bayesian exploration of the parameter space\, we design a technique used to refine the planet parameters. I will illustrate this approach on a few notable planetary systems.  \nThe seminar will take place in room S09 at the Faculty of Sciences
URL:https://www.naxys.be/event/manu-stalport-geneva-university/
CATEGORIES:NAXYS Seminar
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DTSTART;TZID=Europe/Brussels:20221027T130000
DTEND;TZID=Europe/Brussels:20221027T140000
DTSTAMP:20260509T064636
CREATED:20220914T100044Z
LAST-MODIFIED:20220919T080330Z
UID:1689-1666875600-1666879200@www.naxys.be
SUMMARY:Philippe Toint (University of Namur)
DESCRIPTION:Title: Recent topics in complexity for nonconvex optimization problems \nAbstract: The talk will review results on the evaluation complexity of algorithms for nonlinear (nonconvex) optimization problems. The focus is on unconstrained and “simply constrained” cases and will consider obtaining high-order optimality conditions. Algorithms using inexact information will also be covered. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/philippe-toint-university-of-namur/
CATEGORIES:NAXYS Seminar
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