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DTSTART;TZID=Europe/Berlin:20160613T160000
DTEND;TZID=Europe/Berlin:20160613T180000
DTSTAMP:20160509T143007Z
CREATED:20160509T143007Z
LAST-MODIFIED:20160509T143007Z
UID:343-1465833600-1465840800@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Immanuel Bomze
DESCRIPTION:On June 13\, 2016\,   Immanuel Bomze from the University of Vienna will join the ALOP-Colloquium and present his recent work. At 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS10. \nSecond-order local optimality conditions involving copositivity of the Hessian of the Lagrangian on the reduced (polyhedral) tangent conehave the advantage that there is only a small gap between sufficient (the Hessian is strictly copositive) and necessary (the Hessian is copositive) conditions. In this respect\, this is a proper generalization of convexity of the Lagrangian. We also specify a copositivity-based variant which is sufficient for global optimality. For (nonconvex) quadratic optimization problems over polyhedra (QPs)\, the distinction between sufficiency and necessity vanishes\, both for local and global optimality. However\, in the strictly copositive case we can provide a distance lower (error) bound of the increment around a local minimizer. This is a refinement of an earlier result which focussed on mere (non-strict) copositivity. In addition\, an apparently new variant of constraint qualification (CQ) is presented which is implied by Abadie’s CQ and which is suitable for second-order analysis. This new reflected Abadie CQ is neither implied\, nor implies\, Guignard’s CQ. However\, it implies the necessary second-order local optimality condition based on copositivity [2]. \nFor minimization problems under (possibly non-convex) quadratic and linear constraints\, we characterize both Lagrangian and Semi-Lagrangian dual bounds in terms of conic optimization. While the Lagrangian dual is equivalent to the SDP relaxation\, the Semi-Lagrangian dual we study is equivalent to a natural copositive relaxation. This way\, we arrive at a full hierarchy of tractable conic bounds tighter than the usual Lagrangian dual (and thus than the SDP) bounds. In particular\, the usual zero-order approximation by doubly nonnegative matrices improves upon the Lagrangian dual bounds. Specialized to this setting\, the optimality conditions developed above now return as sufficient conditions for tightness of the relaxation; for instance\, copositivity of the slack matrix guarantees global optimality for KKT points of this problem [2]. \n[1] I.M. Bomze. Copositive relaxation beats Lagrangian dual bounds in quadratically and linearly constrained QPs. SIAM J. Optimization 25 (3)\, 1249–1275 (2015). \n[2] I.M. Bomze. Copositivity for second-order optimality conditions in general smooth optimization problems. Optimization 64(1)\, 779-795 (2016). \n 
URL:https://alop.uni-trier.de/event/alop-colloquium-with-immanuel-bomze/
LOCATION:Trier University – E-Building – HS 9\, Universität Trier Gebäude E\, Trier\, Rhineland-Palatinate\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20160620T160000
DTEND;TZID=Europe/Berlin:20160620T180000
DTSTAMP:20160509T132051Z
CREATED:20160509T130253Z
LAST-MODIFIED:20160509T132051Z
UID:341-1466438400-1466445600@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Felix Kuebler
DESCRIPTION:On June 20\, 2016\,  Felix Kuebler from the University Zurich\, Institute of Banking and Finance will join the ALOP-Colloquium and present his recent work. At 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS10. \nRecursive equilibria in dynamic economies with stochastic production (mit Johannes Brumm und Dominika Kryczka) \nIn this paper\, we prove the existence of recursive equilibria in stochastic production economies with infinitely lived agents and incomplete financial markets. We consider a general dynamic model with several commodities and general inter- and intra-temporal production\, which encompasses heterogeneous agent versions of both the Lucas asset pricing model and the stochastic neo-classical growth model as special cases. \n 
URL:https://alop.uni-trier.de/event/alop-colloquium-with-felix-kuebler/
LOCATION:Trier University – E-Building – HS 9\, Universität Trier Gebäude E\, Trier\, Rhineland-Palatinate\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20160621
DTEND;VALUE=DATE:20160701
DTSTAMP:20160623T091312Z
CREATED:20160623T084239Z
LAST-MODIFIED:20160623T091312Z
UID:352-1466467200-1467331199@alop.uni-trier.de
SUMMARY:Short Course on Reduced Order Work Models
DESCRIPTION:Prof. Matthias Heinkenschloss with the Department of Computational and Applied Mathematics\, Rice University in Houston\, Texas is offering a short course on Reduced Order Work Models at Trier University on behalf of the Research Training Group on Algorithmic Optimization.  \nThe following is an outline of the short course: \nMany applications require the repeated solution of partial differential equations (PDEs) for different input parameters or even the solution of optimization problems governed by PDEs. These tasks can be computationally expensive\, sometimes prohibitively expensive when carried out using only high fidelity PDE discretizations. Model order reduction systematically extracts key dynamics to generate low-order representations of the (high fidelity discretizations of the) PDEs so that quantities of interest generated from the PDE solutions are well approximated by these low-order representations. \nThis short course will introduce current methods for the computation of projection based reduced order models (ROMs)\, analyze the computational cost and the approximation properties of these ROMs\, and demonstrate their application on model PDEs. The second part of this course will introduce approaches for the integration of projection based ROMs into the solution of some classes of PDE constrained optimization problems. \nThe course will consist of five lectures\, with the tentative lecture schedule as follows: \n\n\nPDE model problems and their discretizations; PDE constrained optimization model problems and their discretizations; gradient and Hessian computations.\n\n\nThe Reduced Basis method and Proper Orthogonal Decomposition.\n\n\nThe (Discrete) Empirical Interpolation Method ( (D)EIM ).\n\n\nROMs for linear-quadratic PDE constrained optimization problems.\n\n\nApproaches and challenges for the use of ROMs in nonlinear PDE constrained optimization problems.\n\n\nThe short course on Reduced Order Work Models will take place beginning on Tuesday\, June 21\, 2016 through Thursday\, June 30\, 2016. \nFor more information on the exact times and lecture hall\, contact the organizer.
URL:https://alop.uni-trier.de/event/short-course-on-reduced-order-work-models/
CATEGORIES:Short Course
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20160627T160000
DTEND;TZID=Europe/Berlin:20160627T180000
DTSTAMP:20160623T091654Z
CREATED:20160513T070527Z
LAST-MODIFIED:20160623T091654Z
UID:345-1467043200-1467050400@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Peter Deuflhard
DESCRIPTION:On June 27\, 2016\,  Prof. Dr. Dr. h.c. Peter Deuflhard from the Université Pierre et Marie Curie (UPMC) will join the ALOP-Colloquium and present his recent work. At 15:45 there will be a coffee hour in E10.  At 16:15 the presentation will take place in HS10.  \nTHE GRAND FOUR.  Affine Invariant Newton Methods for Nonlinear Problems  \nFour affine invariance classes (affine covariance\, affine contravariance\, affine conjugacy\, affine similarity) for nonlinear problems lead to four different classes of adaptive Newton algorithms.  \nAffine covariance applies to boundary value problems for differential equations (both ODEs and PDEs)\, affine contravariance applies to Fredholm integral equations\, affine conjugacy leads to convex optimization\, and\, last but not least\, affine similarity leads to pseudo-transient continuation methods for equilibrium problems in time dependent ODEs or PDEs. For the latter invariance class rather recent results are presented.  \n  \n 
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-dr-h-c-peter-deuflhard/
LOCATION:Trier University – E-Building – HS 9\, Universität Trier Gebäude E\, Trier\, Rhineland-Palatinate\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20160704T160000
DTEND;TZID=Europe/Berlin:20160704T180000
DTSTAMP:20160613T072543Z
CREATED:20160613T072543Z
LAST-MODIFIED:20160613T072543Z
UID:349-1467648000-1467655200@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Andreas Brieden
DESCRIPTION:On July 4\, 2016\,  Prof. Dr. Andreas Brieden  from the Universität der Bundeswehr München \nwill join the ALOP-Colloquium and present his recent work. At 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS10. \nPolytope\, Bionade und Antidepressiva \nDer hohe Stellenwert der Algorithmischen Optimierung (oder auch Mathematischen Optimierung bzw. Angewandten Algorithmischen Mathematik) erklärt sich nicht allein durch eine Fülle wertvoller theoretischer Resultate. Insbesondere ihr Beitrag bei der erfolgreichen Lösung einer Vielzahl von realökonomischen Herausforderungen unterstreicht ihre Bedeutung. Dabei ist es oftmals verblüffend\, welch unterschiedlichsten Probleme der Theorie und Praxis mit Hilfe geeigneter Modellbildung in Beziehung zueinander gebracht werden können. Im Vortrag steht ein Modell im Vordergrund\, mit dem unter anderem Polytope\, Bionade (eigentlich nur Holunder-Bionade) und Antidepressiva in enge Beziehung zueinander gesetzt werden können.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-andreas-brieden/
LOCATION:Trier University – E-Building – HS 9\, Universität Trier Gebäude E\, Trier\, Rhineland-Palatinate\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20160919
DTEND;VALUE=DATE:20160923
DTSTAMP:20180409T145648Z
CREATED:20160301T064308Z
LAST-MODIFIED:20180409T145648Z
UID:209-1474243200-1474588799@alop.uni-trier.de
SUMMARY:Autumn School Algorithmic Optimization
DESCRIPTION:  \n \nThe Autumn School 2016 of the RTG “Algorithmic Optimization” introduced participants to the main ideas from various fields of mathematical optimization. Ranging from 1) PDE-constrained\, 2) discrete and 3) multicriteria optimization to 4) optimization in statistics a broad overview was provided. The autumn school focused on recent algorithmic advances in these fields. \n  \n  \n  \n                           \n  \n  \nSpeakers: \n \nGöran Kauermann\, LMU München \n\nNon-parametric statistical modelling partially using big data\n\n  \n \n  \n  \n  \n  \n  \nWinnifried Wollner\, TU Darmstadt \n\nAdaptive finite elements in numerical optimization\n\n  \n \n  \n  \n  \n  \n  \nSven Krumke\, TU Kaiserslautern \n\nOnline Optimization\n\n  \n \n  \n  \n  \n  \n  \nGabriele Eichfelder\, TU Ilmenau \n\nMulti-objective optimization\n\n  \nAbstracts: Autumn School Abstracts \nOrganizers: \nEkkehard Sachs\, Martin Siebenborn \n  \n  \n 
URL:https://alop.uni-trier.de/event/autumn-school-algorithmic-optimization/
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20160926
DTEND;VALUE=DATE:20160929
DTSTAMP:20160928T133055Z
CREATED:20160301T064743Z
LAST-MODIFIED:20160928T133055Z
UID:211-1474848000-1475107199@alop.uni-trier.de
SUMMARY:ALOP Workshop: Reduced Order Models in Optimization
DESCRIPTION:The ALOP Workshop “Reduced Order Models in Optimization” starts on Monday\, September 26\, 2016 at 9:00 and ends Wednesday\, September 28\, 2016 at 16:00. \nReduced order models represent a growing research direction in the modeling\, simulation and optimization of complex systems. During this workshop taking place in September 2016 as part of the Research Training Group “Algorithmic Optimization\,” internationally known researchers will present their latest research results with a focus on particular aspects in the area of optimization. \nThis workshop will grant additional insight into the subject matter and the current research in Reduced Order Models\, following the introductory short-course presented this past summer by the Mercator Fellow Prof. Heinkenschloß of Rice University in Houston. \nResearchers from all areas of optimization are encouraged to participate and to present their work. The conference will provide a good opportunity for exchanging ideas and for establishing contacts with colleagues in a friendly atmosphere. \n \nAmong the participating guests are \nMichel Bergmann\, INRIA Bordeaux \nJeff Borggaard\, Virginia Tech \nJens Bremer\, MPI Magdeburg \nJohn A. Burns\, Virginia Tech \nRomanus Dyczij-Edlinger\, Universität Saarbrücken \nGiulia Fabrini\, Universita di Genova \nMartin Grepl\, RWTH Aachen \nBernard Haasdonk\, Universität Stuttgart \nBabak Maboudi\, EPFL Lausanne \nLaura Iapichino\, Delft University of Technology \nOliver Lass\, TU Darmstadt \nKarl Meerbergen\, KU Leuven \nBernd Noack\, LIMSI-CNRS\, TU Braunschweig \nWil Schilders\, TU Eindhoven \nJohn Singler\, Missouri University \nMartin Stoll\, MPI Magdeburg \nKaren Veroy-Grepl\, RWTH Aachen \n  \nOrganizers: \nEkkehard Sachs\, Volker Schulz\, Martin Siebenborn\, Stefan Volkwein \nThere will be a conference dinner on Tuesday\, September 27\, 2016 at 18:00 at Das Weinhaus in Trier. \n  \n\n\n\nProgram: \n\n Monday\, September 26\, 2016 \n\n\n\n10:00 am –  10:45 am\nJohn Burns\nApproximation for Design and Control of Composite Thermal Fluid Systems: Reduced Models\n\n\n10:45 am –  11:30 am\nKaren Veroy-Grepl\nCertified Reduced Basis Methods in Optimal Control and Data Assimilation \n\n\n1:00 pm –  1:45 pm\nBernd Noack\nClosed-loop turbulence control using reduced-order modeling and machine learning\n\n\n1:45 pm –  2:30 pm\nAndrea Ferrero\nDifferent approaches to the development of reduced-order models for NS equations\n\n\n3:00 pm –  3:45 pm\nKarl Meerbergen\nProgress in model reduction for systems with nonlinear frequency dependency\n\n\n3:45 pm –  4:30 pm\nLaura Iapichino\nReduced Basis methods for PDE constrained Multi-objective Optimization\n\n\n \nTuesday\, September 27\, 2016 \n\n\n\n9:00 am –  9:45 am\nJeff Borggaard\nPOD-Based ROMs of Fluids for Shape Optimization Problems\n\n\n9:45 am –  10:30 am\nJens Bremer\nPOD-based ROMs and Optimization of CO2 Methanation Reactors\n\n\n11:00 am –  11:45 am\nMartin Stoll\nLow-rank solvers for PDE-constrained optimization and statistical inverse problems\n\n\n11:45 am –  12:30 pm\nBabak Maboudi\nStructure-Preserving Model-Reduction of Hamiltonian Systems\n\n\n2:00 pm –  2:45 pm\nBernard Haasdonk\nRB Approximation for Parameter Optimization and Optimal Feedback Control\n\n\n2:45 pm –  3:30 pm\nMartin Grepl\nA certified trust-region reduced basis approach to PDE-constrained optimization \n\n\n4:00 pm –  4:45 pm\nJohn Singler\nPOD computations and POD projections\n\n\n4:45 pm –  5:30 pm\nOliver Lass\nNonlinear robust optimization using a second order approximation technique and model order reduction\n\n\n \nWednesday\, September 28\, 2016 \n\n\n\n9:00 am –  9:45 am\nWil Schilders\n\nMOR in the optimisation of highly nonlinear oscillatory electronic circuits \n\n\n\n9:45 am –  10:30 am\nGiulia Fabrini\nA HJB-POD approach to the control of the level set equation\n\n\n\n11:00 am – 11:45 am \n\nRomanus Dyczij-Edlinger\nModel-Order Reduction in Computational Electromagnetics\n\n\n\n Workshop Program \n  \n  \n 
URL:https://alop.uni-trier.de/event/alop-workshop-reduced-order-models-in-optimization/
CATEGORIES:Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20161004T154500
DTEND;TZID=Europe/Berlin:20161004T174500
DTSTAMP:20170406T134557Z
CREATED:20160711T084120Z
LAST-MODIFIED:20170406T134557Z
UID:368-1475595900-1475603100@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Dr. Lars Grasedyck
DESCRIPTION:On October 4\, 2016\,  Prof. Dr. Lars Grasedyck  from the RWTH University Aachen   \nwill join the ALOP-Colloquium and present his recent work. At 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS9. \nHierarchical Low Rank Tensor Formats  \nAbstract \nThe first part of this talk on hierarchical low rank formats starts with a general introduction to notions of rank in higher dimensions\, namely Canonical Polyadic (CP)\, Tucker\, TT and Hierarchical Tucker (HT) ranks and the corresponding data-sparse tensor representations. \nEach of the notions of rank gives rise to a different set or manifold of tensors of fixed rank and we compare very briefly the advantages and drawbacks between the different formats. The concepts are introduced in the discrete setting where a tensor is a mapping from a d-fold Cartesian product of finite index sets\, but we also point out the relation to d-variate functions\, the continuous setting. We summarize some interesting open questions that open new and sometimes very difficult areas of research. \nIn the second (and shorter) part of the talk we consider the application of hierarchical low rank formats for uncertainty quantification\, or more specifically for the data-sparse representation of parameter dependent quantities of interest. The data-sparse low rank formats have a strong relation to reduced basis techniques for linear and nonlinear model reduction\, but both methods have their individual advantages or disadvantages. The most challenging question in this area is whether or not the object of interest possesses the low rank structure and how one can reliably approximate it.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-lars-grasedyck/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20161005T154500
DTEND;TZID=Europe/Berlin:20161005T174500
DTSTAMP:20160923T124006Z
CREATED:20160916T072401Z
LAST-MODIFIED:20160923T124006Z
UID:426-1475682300-1475689500@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Dr. Harbir Antil
DESCRIPTION:On October 5\, 2016\, Prof. Dr. Harbir Antil from George Mason University will join the ALOP-Colloquium and present his recent work. At 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS10. \nOptimal control of fractional order PDEs \nAbstract \nDiffusion is the tendency of a substance to evenly spread into an available space\, and is one of the most common physical processes. The classical models of diffusion lead to well-known equations. However\, in recent times\, it has become evident that many of the assumptions involved in these models are not always satisfactory or not even realistic at all. Consequently\, different models of diffusion have been proposed\, fractional diffusion being one of them. The latter has received a great deal of attention recently\, mostly fueled by applications in diverse areas such as finance\, turbulence and quasi-geostrophic flow models\, image processing\, peridynamics\, biophysics\, and many others. \nThis talk will serve as an introduction to fractional diffusion equation – fractional derivative in both space and time. A novel PDE result by Caffarelli and Silvestre ’07 has led to innovative schemes to realize the fractional order operators. We will discuss these numerical methods and their application to PDE constrained optimization problems.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-harbir-antil/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20161024T154500
DTEND;TZID=Europe/Berlin:20161024T173000
DTSTAMP:20161013T150300Z
CREATED:20160711T084503Z
LAST-MODIFIED:20161013T150300Z
UID:370-1477323900-1477330200@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Dr. Georg Pflug
DESCRIPTION:On October 24\, 2016\,  Prof. Dr. Georg Pflug  from the University of Vienna   \nwill join the ALOP-Colloquium and present his recent work: \nMultistage Stochastic Optimization: Approximation\, bounds and ambiguity \nAbstract \nMultistage stochastic programs are – in contrast to two-stage programs – difficult variational problems for which solutions can be found only in exceptional cases. For this reason\, we have to approximate them by easier programs. We show how a distance between these problems can be found by a variant of a transportation distance\, which we call nested distance. It allows to quantify the approximation error. Alternatively\, one may find upper and lower programs\, that is simple stochastic programs\, the optimal values of which give guaranteed upper and lower bounds. A refinement strategy allows to push the bound as close as we want it together. In a second part\, we use the nested distance to describe the model uncertainty. This allows us to find distributionally robust solutions by some minimax approach. \nAt 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-georg-pflug/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20161107T154500
DTEND;TZID=Europe/Berlin:20161107T173000
DTSTAMP:20161013T150417Z
CREATED:20160711T085121Z
LAST-MODIFIED:20161013T150417Z
UID:371-1478533500-1478539800@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Dr. Maria Dolores Ugarte
DESCRIPTION:On November 7\, 2016\,  Prof. Dr. Maria Dolores Ugarte  from the Universidad Publica de Navarra  will join the ALOP-Colloquium and present her recent work:  \nTitle:  Analyzing cancer mortality in small areas using Bayesian B-splines   \n Abstract: In recent years\, models incorporating splines have been considered for smoothing risks in disease mapping.  Although these models are very fexible\, they can be computationally demanding in certain cases. In this talk\, several models including one\, two\, and three dimensional B-splines (penalized or un-penalized) are proposed to analyze spatio-temporal risks. As computing time could be a limitation in real practice\, integrated nested Laplace approximations are considered for model fitting and inference. The complete set of proposed models are used to analyze cancer mortality data in small areas. \nAt 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-maria-dolores-ugarte/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20161128T154500
DTEND;TZID=Europe/Berlin:20161128T174500
DTSTAMP:20161111T095249Z
CREATED:20160913T084634Z
LAST-MODIFIED:20161111T095249Z
UID:421-1480347900-1480355100@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Dr. Benedikt Wilbertz
DESCRIPTION:On November 28\, 2016\,  Dr. Benedikt Wilbertz will join the ALOP-Colloquium and present his recent work entitled \n Hot Topics in Machine Learning \nAbstract \nThe history of machine learning goes back to the late 50s\, when the first perceptron models were created to build machines that lean from observations. \nIt took until the mid 80s that Yann LeCun constructed a neural network which can be considered as the first production read application of modern machine learning. \nSince then\, the field shifted its focus more towards statistics and probability theory\, which gave birth to bagging\, boosting and the random forest algorithm. \nOnly very recently and with the availability of huge training sets and the incredible computing power of GPGPU devices\, neural networks had a massive comeback as Deep Learning methods and established many new state of the art results in for speech recognition\, image analysis\, natural language processing etc. \nIn this talk we give an overview over the recent developments in the field Deep Learning\, but also present some new implementation of boosting algorithms and show some practical applications. \n\n\n\n \n\n\n\n At 15:45 there will be a coffee hour in E10. At 16:15 the presentation will take place in HS9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-dr-benedikt-wilbertz/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20161130T140000
DTEND;TZID=Europe/Berlin:20161130T160000
DTSTAMP:20161116T124512Z
CREATED:20161110T140711Z
LAST-MODIFIED:20161116T124512Z
UID:739-1480514400-1480521600@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Prof. Dr. Andreas Krause
DESCRIPTION:On Wednesday\, November 30\, 2016\,  Prof. Dr. Andreas Krause from the ETH Zurich will join the ALOP-Colloquium and present his recent work entitled \nSubmodularität und Machine Learning \n  \nAt 13:45 there will be a coffee hour in E-10. At 14:00 the presentation will take place in HS9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-andreas-krause/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170119T161500
DTEND;TZID=Europe/Berlin:20170119T180000
DTSTAMP:20170406T133024Z
CREATED:20161110T131230Z
LAST-MODIFIED:20170406T133024Z
UID:727-1484842500-1484848800@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Prof. Dr. Armin Fuegenschuh
DESCRIPTION:On Thursday\, January 19\, 2017\,  Prof. Dr. Armin Fuegenschuh from the Helmut Schmidt Universitaet Hamburg will join the ALOP-Colloquium and present his recent work entitled \nDesign Issues for Magnetic Rulers \n We deal with the design of a magnetic ruler as an absolute positioning system. Trapezoid-shaped magnetic areas are placed side by side\, so that the resulting pattern enables a unique encoding of each position up to a micrometer level. The problem of finding a longest-possible ruler from a set of elementary magnetic areas is formulated as a linear mixed-integer problem\, and solved with a mixture of a heuristic and an extact approach. We demonstrate how to approximate the magnetic signal\, using measured data from Hall sensor cells. From there\, we discuss how the absolute position is recovered. Practical problems\, such as measuring in an unknown altitude\, are addressed.  \n (This is joint work with: M. Fügenschuh\, M. Ludszuweit\, A. Mojsic\, & J. Sokol) \n  \nAt 15:45 there will be a coffee hour. At 16:15 the presentation will take place in HS9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-armin-fuegenschuh/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170123T160000
DTEND;TZID=Europe/Berlin:20170123T180000
DTSTAMP:20170105T150710Z
CREATED:20161110T134251Z
LAST-MODIFIED:20170105T150710Z
UID:734-1485187200-1485194400@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Dr. Roland Hildebrand
DESCRIPTION:On Thursday\, January 23\, 2017\,  Dr. Roland Hildebrand from the University of Grenoble  will join the ALOP-Colloquium and present his recent work \n Element-wise functions preserving positivity of matrices  \nAt 15:45 there will be a coffee hour in E10. The presentation will take place in HS9 at 16:15.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-dr-roland-hildebrand/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170206T160000
DTEND;TZID=Europe/Berlin:20170206T180000
DTSTAMP:20170120T085952Z
CREATED:20170120T085700Z
LAST-MODIFIED:20170120T085952Z
UID:997-1486396800-1486404000@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Dr. Bart Vandereycken
DESCRIPTION:On Monday\, February 6\, 2017\,  Dr. Bart Vandereycken from the University of Geneva will join the ALOP-Colloquium and present his recent work \n Manifold optimization for low rank matrix and tensor completion \nThe minimisation of a smooth objective function subject to (matrix) rank constraints can sometimes be very effectively solved by methods from Riemannian optimisation. This is for instance the case with the low-rank matrix and tensor completion problems However\, the standard theory of Riemannian optimisation leaves some questions unanswered regarding its theoretical and practical application. I will focus on two such questions. The first is how the (Riemannian) metric has a significant impact on the convergence of the numerical methods which I will illustrate by deriving recovery guarantees assuming RIP. The second topic is rank adaptivity. In rank-constrained optimisation\, the rank is typically not known and instead one is searching for the smallest rank satisfying a certain criterion\, like a small residual. I will explain how the geometry of the tangent cone of the variety of matrices of bounded rank can be incorporated so as to obtain rank adaptive algorithms that stay true to the manifold paradigm. \n  \nAt 15:45 there will be a coffee hour in E10. The presentation will take place in HS9 at 16:15.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-dr-bart-vandereycken/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20170313T080000
DTEND;TZID=Europe/London:20170316T170000
DTSTAMP:20170328T084355Z
CREATED:20170328T084355Z
LAST-MODIFIED:20170328T084355Z
UID:1127-1489392000-1489683600@alop.uni-trier.de
SUMMARY:DFG-AIMS Workshop
DESCRIPTION:DFG-AIMS Workshop on Shape optimization\, homogenization and control\n  \nTime: March 13-16\, 2017 Location: AIMS Sénégal\, Mbour\, Sénégal.\n  \n  \nSupported by  and  \n  \n  \n  \nOrganizers: \n\nVolker Schulz (Trier University)\nDiaraf Seck (Cheikh Anta Diop University Dakar\, Sénégal)\n\n  \nLocal organization comittee: \n\nProf. Dr. Diaraf Seck\, Université Cheikh Anta Diop (UCAD)\, Dakar\, Sénégal\nProf. Dr. Mouhamed Moustapha Fall\, Professor of the Humboldt Chair (AIMS Sénégal)\nProf. Dr. Idrissa Ly\, Shape optimization\, UCAD\, Dakar\, Sénégal:\nProf. Dr. Babacar Mbaye Ndiaye\, Optimization and Operation Research\, UCAD\, Sénégal\nProf. Dr. Aissa Wade \, Geometry (Academic Director of AIMS Sénégal)\nProf. Dr Salimata Gueye Diagne \, Optimization and Operation Research\, UCAD\, Sénégal\n\n  \n  \nProgram outline (more details coming soon): \n  \n\n\n\n\nMonday\, March 13 2017  \n\n\n\n\n08:00 \n\n\nDeparture from Hotel Royal Saly to AIMS-Centre\, Mbour \n\n\n\n\n08:45-09:00 \n\nOpening Remarks\n\n\n\n09:00-09:45 \n\nMouhamed Moustapha Fall: Interfaces arising in longrange interactions\n\n\n\n09:45-10:30 \n\nMichel Delfour: Shape and topological derivatives via one sided differentiation of Lagrangian functionals\n\n\n\n10:30-11:00 \n\ncoffee break\n\n\n\n11:00-11:45 \n\nDiaraf Seck: Optimal Shapes in hydro and morphodynamic equations\n\n\n\n11:45-12:30 \n\nMartin Rumpf: Multi-Scale and Risk-Averse Stochastic Shape Optimization\n\n\n\n12:30-13:00 \n\nDFG presentation on funding opportunities\n\n\n\n13:00-14:30 \n\nlunch break\n\n\n\n14:30-15:15 \n\nVolker Schulz: Higher order methods for shape optimization\n\n\n\n15:15-16:00 \n\nCoumba Diallo: Michell truss : topological optimization and Numerical solutions\n\n\n\n16:00-16:30 \n\n\ncoffee break \n\n\n\n\n16:30-17:15 \n\nIbrahima Faye: Models of sand transport equations: A mathematical and numerical study\n\n\n\n17:15-18:00 \n\nLuise Blank: A diffuse interface approach for topology optimization and a global convergent solver\n\n\n\n18:00 \n\nReturn to Hotel Royal Saly (dinner)\n\n\n\nTuesday\, March 14 2017  \n\n\n\n\n08:30 \n\nDeparture from Hotel Royal Saly to AIMS-Centre\, Mbour\n\n\n\n09:30-10:15 \n\nMartin Berggren: On the use of filters and morphological operators for topology optimization of microwave devices\n\n\n\n10:15-11:00 \n\nMamadou Sango: Homogenization of stochastic semi linear parabolic equations in perforated domains\n\n\n\n11:00-11:30 \n\ncoffee break\n\n\n\n11:30-12:15 \n\nHubert Nnang: Two-scale convergence: obviousness of the choice of test functions? Not always\n\n\n\n12:15-13:00 \n\nMichael Hintermüller: Optimal Control of Nonsmooth Phase-Field Models\n\n\n\n13:00-14:30 \n\nlunch break\n\n\n\n14:30-15:15 \n\nAndrea Walther: Employing Algorithmic Differentiation for shape optimization and nonsmooth optimization\n\n\n\n15:15-16:00 \n\nAlassane Sy: Pollutant transfer in porous media\n\n\n\n16:00-16:30 \n\ncoffee break\n\n\n\n16:30-17:15 \n\nMapundi Banda: Numerical Boundary stabilization and optimal control for networked flow\n\n\n\n17:15-18:00 \n\nEkaterina Kostina: Optimization Methods for Nonlinear Model Predictive Control of Non-Stationary Partial Differential Equations\n\n\n\n18:00 \n\nReturn to Hotel Royal Saly (dinner)\n\n\n \nConference Dinner in the evening\n\n\n\nWednesday\, March 15 2017  \n\n\n\n\n08:30 \n\nDeparture from Hotel Royal Saly to AIMS-Centre\, Mbour\n\n\n\n09:30-10:15 \n\nGünter Leugering: Challenges in Optimal Control Problems for Gas and Fluid Flow in Networks of Pipes and Canals: From Modeling to Industrial Applications\n\n\n\n10:15-11:00 \n\nIdrissa Ly: The first eigenvalue for the p-Laplacian operator\n\n\n\n11:00-11:30 \n\ncoffee break\n\n\n\n11:30-12:15 \n\nJean Louis Woukeng: Multiscale Analysis – Bridging Scales in Mathematical Modelling and Simulation\n\n\n\n12:15-13:00 \n\nMario Ohlberger: Online enrichement for localized reduced order methods in optimization and control\n\n\n\n13:00-14:30 \n\nlunch break\n\n\n\n14:30-18:00 \n\nExcursion to a wild life park near Mbour\n\n\n\nThursday\, March 16 2017  \n\n\n\n\n08:00 \n\nDeparture from Hotel Royal Saly to AIMS-Centre\, Mbour\n\n\n\n09:00-09:45 \n\nSergio Conti: Optimization of microstructural shape in Magnetic-Shape-Memory Composites\n\n\n\n09:45-10:30 \n\nMariama Diakhaby: Interface identification problem between two non-miscible fluids\n\n\n\n10:30-12:00 \n\nPoster Blitz\, afterwards Coffee Break along with Poster session\n\n\n\n12:00-12:30 \n\n\nYR-presentation: Mouhamadou A. M. T. Baldé. Title: Numerical simulation for a coupled system: the case of shallow water and a morphodynamic equation. \n\n\n\n\n12:30-13:00 \n\n\nYR-presentation: Mouhamadou Alpha Diallo Title: Integrodifferential equations: controllability and existence of a optimal control. \n\n\n\n\n13:00-14:30 \n\nLunch Break\n\n\n\n14:30-15:00 \n\n\nYR-presentation: EL Hadji Abodulaye Thiam Title: Hardy-Sobolev inequality with singularity a curve. \n\n\n\n\n15:00-15:30 \n\n\nYR-presentation: Ignace Aristid Minlend Title: Serrin’s overdetermined Problem on the Sphere. \n\n\n\n\n15:30-16:00 \n\ncoffee break\n\n\n\n16:00-16:30 \n\nfinal discussion\n\n\n\n16:30 \n\nDeparture\n\n\n\n  \n  \nAccomodation: Hotel Royal Saly\, Route Saly-Ngaparou\, Mbour\, Senegal For more travel information see the personal invitation or contact Ms. Alida Höbener \n  \n  \n-> List of participating researchers
URL:https://alop.uni-trier.de/event/dfg-aims-workshop/
LOCATION:Hotel Royal Saly\, Route Saly-Ngaparou\, Mbour\, Senegal
CATEGORIES:Workshop
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20170320
DTEND;VALUE=DATE:20170323
DTSTAMP:20170313T122333Z
CREATED:20160614T070319Z
LAST-MODIFIED:20170313T122333Z
UID:350-1489968000-1490227199@alop.uni-trier.de
SUMMARY:ALOP Workshop: Women in Optimization
DESCRIPTION:Der Workshop “Women in Optimization” findet vom 20. – 22. März 2017 an der Universität Trier statt.   \nDieser Workshop richtet sich an Nachwuchswissenschaftlerinnen\, Doktorandinnen und Studentinnen der Mathematik mit dem Schwerpunkt Optimierung. Das Ziel des Workshops liegt sowohl in der fachlichen Weiterbildung als auch in der Vernetzung innerhalb der Optimierungscommunity. In Fachvorträgen geladener Referentinnen möchten wir zum einen ein möglichst breites fachliches Spektrum der mathematischen Optimierung und der damit verbundenen Numerik präsentieren. Zum anderen möchten wir den Teilnehmerinnen verschiedene Karrieremodelle vorstellen\, deren Tätigkeitsbereich mit der mathematischen Optimierung in Verbindung steht. Neben den Vorträgen bietet der Workshop viel Raum für wissenschaftliche Diskussionen und Erfahrungsaustausch. Im Rahmen von Postersessions wird den Nachwuchswissenschaftlerinnen die Möglichkeit zur aktiven Teilnahme gegeben. \nProgramm: \nDas Programmheft ist hier verfügbar. Jede Teilnehmerin erhält bei der Registrierug ein gedrucktes Exemplar. \nWorkshopsprache: \nDeutsch \nFachliche Schwerpunkte: \n\nDiskrete Optimierung\nGemischt-ganzzahlige Optimierung\nLineare-/nichtlineare Optimierung\nOptimalsteuerung\nInverse Optimalsteuerung\nOptimierung mit partiellen Differentialgleichungen\nParameterschätzung/Versuchsplanung\nStochastische Optimierung\nAngewandte Optimierung und Optimalsteuerung\nNumerik\n\n Nicht-fachliche Schwerpunkte: \n\nKarriereplanung\nBeruf und Familie\nNetworking\n\n Vortragende:    Vorträge können nur auf Einladung der Organisatorinnen erfolgen\, es ist nicht möglich\, selbst einen Vortrag anzumelden.  Alle Teilnehmerinnen haben jedoch die Möglichkeit\, ihre Arbeit in einem Poster vorzustellen.  \nFolgende Vortragende konnten bisher gewonnen werden: \nLuise Blank (Universität Regensburg) Debora Clever (ABB AG\, Forschungszentrum Ladenburg)Gabriele Eichfelder (Technische Universität Ilmenau)  Christina Jager-Zlotowski (eufom University of Economics & Management Luxemburg)Frauke Liers (Universität Erlangen-Nürnberg) Ira Neitzel (Universität Bonn)  Sabine Pickenhain (Brandenburgische Technische Universität Cottbus-Senftenberg) Elena Resmerita (Alpen-Adria Universität Klagenfurt) Birgit Rudloff (Wirtschafts Universität Wien) Anita Schöbel (Georg-August-Universität Göttingen)  Carola Schönlieb (University of Cambridge) Sonja Steffensen (Rheinisch-Westfälische Technische Hochschule Aachen)  Christiane Tammer (Martin-Luther-Universität Halle-Wittenberg) Carolin Trouet (Lufthansa Systems)   \nOrganisatorinnen: \nLuise Blank\, Universität Regensburg \nDebora Clever\, ABB AG\, Forschungszentrum Ladenburg \nMirjam Dür\, Universität Trier \nBarbara Kaltenbacher\, Universität Klagenfurt \nKatja Mombauer\, Universität Heidelberg \nSonja Steffensen\, RWTH Universität Aachen \nAndrea Walther\, Universität Paderborn \n  \nAnmeldung: Die Anmeldefrist ist jetzt abgelaufen. \nHotel: \nIm Hotel Deutscher Hof haben wir Einzelzimmer vom 19.3. – 22.3.2017 als Abrufkontingent unter dem Stichwort “Women in Optimization” einrichten lassen.  Diese Zimmer können bis zum 17.2.2017 unter der Tel. Nr. 0651-97780 oder per E-Mail: info@hotel-deutscher-hof.de  reserviert werden. \nZeitplan\, Veranstaltungsort und Anreise: \nDer Workshop beginnt am Montag\, dem 20.3.2017 morgens und endet am Mittoch\, dem 22.3.2017 mittags.Der Workshop findet im E Gebäude am Campus I der Universität Trier statt.  Tipps zur Anreise nach Trier finden Sie hier;Tipps zur Anfahrt zum Campus I finden Sie hier. \nGeschichte: \nWomen in Optimization 2015 (Heidelberg) \n 
URL:https://alop.uni-trier.de/event/women-in-optimization/
LOCATION:Trier University – E-Building – HS 9\, Universität Trier Gebäude E\, Trier\, Rhineland-Palatinate\, 54296\, Germany
CATEGORIES:Workshop
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20170322
DTEND;VALUE=DATE:20170325
DTSTAMP:20170314T102859Z
CREATED:20161117T110643Z
LAST-MODIFIED:20170314T102859Z
UID:863-1490140800-1490399999@alop.uni-trier.de
SUMMARY:ALOP Workshop: Stochastic Models and Control
DESCRIPTION:The workshop will bring together leading experts and researchers from different areas of stochastic control and optimization. Like the preceding successful workshops in this series\, held in Wittenberg (2009)\, Bad Herrenalb/Karlsruhe (2011)\, Berlin (2013)\, and Kaiserslautern (2015)\, the 2017 meeting aims to provide a stimulating environment for discussions of recent developments\, and a platform for presentations of current research in our field.
URL:https://alop.uni-trier.de/event/alop-workshop-stochastic-models-and-control/
LOCATION:Nells Park Hotel\, Dasbachstraße 12\, Trier\, 54292\, Germany
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170419T160000
DTEND;TZID=Europe/Berlin:20170419T180000
DTSTAMP:20170405T080536Z
CREATED:20170120T093648Z
LAST-MODIFIED:20170405T080536Z
UID:1001-1492617600-1492624800@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Dr. Marta D'Elia
DESCRIPTION:On Wednesday\, April 19\, 2017\,  Dr. Marta D’Elia from the Computer Science Research Institute at Sandia National Laboratories will join the ALOP-Colloquium and present her recent work entitled  \nA coupling strategy for nonlocal and local models with applications to static peridynamics and classical elasticity \nABSTRACT: The use of nonlocal models in science and engineering applications has been steadily increasing over the past decade. The ability of nonlocal theories to accurately capture effects that are difficult or impossible to represent by local Partial Differential Equation (PDE) models motivates and drives the interest in this type of simulations. However\, the improved accuracy of nonlocal models comes at the price of a significant increase in computational costs compared to\, e.g.\, traditional PDEs. In particular\, a complete nonlocal simulation remains computationally untenable for many science and engineering applications. As a result\, it is important to develop local-to-nonlocal coupling strategies\, which aim to combine the accuracy of nonlocal models with the computational efficiency of PDEs. The basic idea is to use the more efficient PDE model everywhere except in those parts of the domain that require the improved accuracy of the nonlocal model.  We develop and analyze an optimization-based method for the coupling of nonlocal and local problems in the context of nonlocal elasticity. The approach formulates the coupling as a control problem where the states are the solutions of the nonlocal and local equations\, the objective is to minimize their mismatch on the overlap of the nonlocal and local domains\, and the controls are virtual volume constraints and boundary conditions. We prove that the resulting optimization problem is well-posed and discuss its implementation using Sandia’s agile software components toolkit.  Numerical results for nonlocal diffusion in three-dimensions illustrate key properties of the optimization-based coupling method; these numerical tests provide the groundwork for the development of efficient and effective engineering analysis tools. As an application\, we present results for the coupling of static peridynamics and classical elasticity. \nThe presentation will take place in HS 8. \nPlease join us for coffee in E10 at 15:45
URL:https://alop.uni-trier.de/event/alop-colloquium-with-marta-delia/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170424T160000
DTEND;TZID=Europe/Berlin:20170424T180000
DTSTAMP:20170405T080437Z
CREATED:20170327T121707Z
LAST-MODIFIED:20170405T080437Z
UID:1120-1493049600-1493056800@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Florian Jarre
DESCRIPTION:On Monday\, April 24\, 2017\,  Prof. Florian Jarre from the Heinrich Heine Universität Düsseldorf will join the ALOP-Colloquium and present his recent work “The Max-Cut-Polytop” \nAbstractThe max-cut-polytope arises from a simple reformulation of the problem of finding the maximum cut in a graph with given edge weights. Unfortunately\, the exact pre-presentation of the cut polytope is not tractable unless NP = Co-NP.We discuss two different representations and inner and outer nonlinear approximations of the max-cut polytope leading to the anticipation that solving the max-cut-problem should be easy. (It is not!)This talk is not about a paper but rather about some open questions and possible topics of – rather difficult – future research. \nThe presentation will take place in HS 9. \nPlease join us for coffee in E10 at 15:45
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-florian-jarre-universitat-dusseldorf/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170515T160000
DTEND;TZID=Europe/Berlin:20170515T180000
DTSTAMP:20170427T082452Z
CREATED:20170403T131431Z
LAST-MODIFIED:20170427T082452Z
UID:1158-1494864000-1494871200@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Andreas Frommer
DESCRIPTION:On Monday\, May 15 2017\,   Prof. Andreas Frommer of Bergische Universität Wuppertal will join the ALOP-Colloquium and present his recent work entitled \n  \nMatrix functions – computation and convergence for Krylov subspace based methods  \nAbstract: f(A)b\, the action of the function f of a matrix A on a vector b\, is required in many applications\, for example in exponential integrators\, where f = exp or in lattice QCD where f(z) = z-α; α ϵ (0\, 1). Typically\, A is large and sparse\, so computing f(A) directly is not possible\, but subspace techniques allow to approximate f(A)b. In this talk will address issues related to the computation and to theconvergence analysis for Krylov subspace based methods. The outstanding problem in computation is how to obtain a stable restart procedure\, and we show how this can be achieved when f can be adequately represented by a contour integral. On the analytical side\, we present convergence results when f is a Stieltjes function and A is symmetric and positive denite and\, with appropriate modications\, when A is just positive denite but not necessarily symmetric. Finally\, we will address generalizations to the block case\, i.e. when several vectors b are to be treated simultaneously. \nThe presentation will take place in HS 9 \nWe will meet over coffee in E10 at 15:45
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-frommer/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170529T160000
DTEND;TZID=Europe/Berlin:20170529T180000
DTSTAMP:20170518T142057Z
CREATED:20170206T104751Z
LAST-MODIFIED:20170518T142057Z
UID:1029-1496073600-1496080800@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. François Glineur
DESCRIPTION:On Monday\, May 29\, 2017\,  Prof. François Glineur from the Université catholique de Louvain will join the ALOP-Colloquium and present his recent work entitled \nPerformance estimation of first-order methods for composite convex optimization \nComposite convex optimization consists in the minimization of a convex objective function equal to the sum of several convex functions with different properties\, for example a smooth term and a nonsmooth term. We consider a large class of first-order methods designed to solve such composite problems\, which rely on specific oracles for each term. We show that the worst-case performance of each of those methods can be computed exactly by solving a semidefinite optimization problem\, which also produces an explicit problem instance for which this worst-case is attained. \nThe performance estimation methodology was born in the original work of Drori and Teboulle in 2014\, which introduced a semidefinite relaxation to study the behaviour of first-order optimization algorithms for smooth unconstrained convex optimization. In this talk\, we present a framework that produces exact convergence bounds for fixed-step linear first-order methods applied to general composite convex optimization. These methods include classical and accelerated gradient methods (including constrained and proximal variants)\, conditional gradient and subgradient methods\, and also allow inexact gradient computations. \nIn particular\, our approach allows us to derive exact convergence rates for the proximal gradient method in function value\, gradient residual norm and distance to the solution\, backed by independently-checkable analytical proofs. We also use numerical computations to obtain worst-case rates for several well-known methods including accelerated gradient and the conditional gradient method\, improving on the best published rates. We conclude with a quick overview of a MATLAB toolbox implementing our framework\, called PESTO (Performance Estimation Toolbox)\, available from https://github.com/AdrienTaylor/Performance-Estimation-Toolbox \nThis is a joint work with Adrien B. Taylor and Julien M. Hendrickx\, Université catholique de Louvain\, Belgium \n  \nThe presentation will take place in HS 9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-francois-glineur/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170609T103000
DTEND;TZID=Europe/Berlin:20170609T120000
DTSTAMP:20170428T121722Z
CREATED:20170323T102447Z
LAST-MODIFIED:20170428T121722Z
UID:1108-1497004200-1497009600@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Lorenz T. (Larry) Biegler
DESCRIPTION:On Friday\, June 9 2017\,  Prof. Lorenz T. (Larry) Biegler\,  will join the ALOP-Colloquium and present his recent work.  \nLorenz T. (Larry) Biegler is currently the Head and Bayer University Professor of Chemical Engineering at Carnegie Mellon University. His research interests lie in computer aided process engineering (CAPE) and include flowsheet optimization\, optimization of systems of differential and algebraic equations\, reactor network synthesis and algorithms for constrained\, nonlinear process control. Projects in these areas include analysis and development of nonlinear programming algorithms\, optimization software design and application to real-world chemical processes and energy systems. He has authored or co-authored over 400 archival publications and two textbooks\, edited nine technical books and given numerous invited presentations at national and international conferences. \n  \nNonlinear Programming Properties and Formulations for Nonlinear and Economic Model Predictive Control \n  \nNonlinear Model Predictive Control (NMPC) is a powerful approach for on-line optimization of nonlinear\, dynamic systems. This talk explores nonlinear programming (NLPs) formulations that ensure the stability and robustness of NMPC strategies.  In particular\, NLPs that satisfy familiar second order and regularity conditions have solutions that are continuous and differentiable with respect to perturbations of the problem data\, and are important prerequisites for nominal and ISS stability of NMPC controllers. Moreover\, ensuring these properties is not difficult through reformulation of the NLP subproblem and addition of exact penalty and barrier terms.  This framework is also essential for the extension of NMPC to sensitivity-based NMPC and economic NMPC\, thus leading to efficient\, on-line optimization strategies that guarantee stable and robust performance. The results of this analysis have been implemented within an optimization modeling platform and are demonstrated on challenging case studies drawn from chemical processes. \n  \nThe presentation will take place in HS 10. \nWe will meet for coffee at 10:00 in E10.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-lorenz-t-larry-biegler/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170612T160000
DTEND;TZID=Europe/Berlin:20170612T180000
DTSTAMP:20170608T140235Z
CREATED:20170607T115606Z
LAST-MODIFIED:20170608T140235Z
UID:1316-1497283200-1497290400@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Gabriel Wittum
DESCRIPTION:On Monday\, June 12\, 2017\,  Prof. Gabriel Wittum of King Abdullah University of Science and Technology  will join the ALOP-Colloquium and present his recent work entitled \nSimulation of Neuronal Signal Processing \nThe crucial feature of neuronal ensembles is their high complexity and variability. This makes modelling and computation very difficult\, in particular for detailed models based on first principles. The problem starts with modelling geometry\, which has to extract the essential features from those highly complex and variable phenotypes and at the same time has to take in to account the stochastic variability. Moreover\, models of the highly complex processes which are living on these geometries are far from being well established\, since those are highly complex too and couple on a hierarchy of scales in space and time. Simulating such systems always puts the whole approach to test\, including modeling\, numerical methods and software implementations. In combination with validation based on experimental data\, all components have to be enhanced to reach a reliable solving strategy. \nTo handle problems of this complexity\, new mathematical methods and software tools are required. In recent years\, new approaches such as parallel adaptive multigrid methods and corresponding software tools have been developed allowing to treat problems of huge complexity. In the lecture we present a three dimensional model for the simulation of signal processing in neurons. Part of this approach is a method to reconstruct the geometric structure of neurons from data measured by 2-photon microscopy. Being able to reconstruct neural geometries and network connectivities from measured data is the basis of understanding coding of motoric perceptions and long term plasticity which is one of the main topics of neuroscience. Other issues are compartment models and upscaling.   \nThis presentation will take place in HS 9 \nPlease join us for coffee at 15:45 in E10.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-gabriel-wittum/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170626T160000
DTEND;TZID=Europe/Berlin:20170626T180000
DTSTAMP:20170619T104934Z
CREATED:20170323T103244Z
LAST-MODIFIED:20170619T104934Z
UID:1111-1498492800-1498500000@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Dr. Giorgio Ferrari
DESCRIPTION:On Monday\, June 26 2017\,  Dr. Giorgio Ferrari with Bielefeld University will join the ALOP-Colloquium and present his recent work entitled  \nOn the Optimal Management of Public Debt: a Singular Stochastic Control Problem \n  \nConsider the problem of a government that wants to reduce the debt-to-GDP (gross domestic product) ratio of a country. The government aims at choosing a debt reduction policy which minimises the total expected cost of having debt\, plus the total expected cost of interventions on the debt ratio. We model this problem as a singular stochastic control problem over an infinite time-horizon. In a general not necessarily Markovian framework\, we first show by probabilistic arguments that the optimal debt reduction policy can be expressed in terms of the optimal stopping rule of an auxiliary optimal stopping problem. We then exploit such link to characterise the optimal control in a two-dimensional Markovian setting in which the state variables are the level of the debt-to-GDP ratio and the current inflation rate of the country. The latter follows uncontrolled Ornstein-Uhlenbeck dynamics and affects the growth rate of the debt ratio. We show that it is optimal for the government to adopt a policy that keeps the debt-to-GDP ratio under an inflation-dependent ceiling. This curve is given in terms of the solution of a nonlinear integral equation arising in the study of a fully two-dimensional optimal stopping problem. \n  \nThe presentation will take place in HS9. \nPlease join us for coffee at 15:45 in E10.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-giorgio-ferrari/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20170828
DTEND;VALUE=DATE:20170901
DTSTAMP:20180409T145705Z
CREATED:20170209T095940Z
LAST-MODIFIED:20180409T145705Z
UID:1035-1503878400-1504223999@alop.uni-trier.de
SUMMARY:Autumn School: Optimization in Machine Learning and Data Science
DESCRIPTION:Large parts of the new economy rely on data science and the application of machine learning. For handling these modern computational and statistical problems\, optimization algorithms are of utmost importance. The typically large data sets involved in this context urge for new optimization techniques. \nTherefore\, we are delighted to announce Julian Hall\,  Tamara G. Kolda\, Stephen Wright as speakers at the upcoming ALOP Autumn School entitled “Optimization in Machine Learning and Data Science.” \nRepresenting three top class authorities in their respective fields of research\, reaching from optimization of signal and image processing over large scale linear programming problems to tensor decomposition and many more\, they will be sharing their experience and knowledge on theory and application of optimization algorithms. \nAutumn School 2017 Program (click for download) \nRegistration is closed \nInformation on scheduled Speakers:  \n  \nJulian Hall\, The University of Edinburgh –   \nHis research interests are the development of algorithmic and computational techniques for solving large scale linear programming (LP) problems using the revised simplex method on both serial and parallel computers. Consequential research interest is the application of these techniques in other areas of computation optimization and linear algebra. \nMr. Hall plans on talking about high performance simplex which will naturally lead into high performance numerical computation. He will look at computational issues in interior point methods and the applicability of “modern” first order methods to the solution of LP problems\, as well as talk about one of his current research topics. \n  \n Tamara G. Kolda\, Sandia National Laboratories –   \nHer research interests are computational algorithm design and development\, including linear and multi-linear algebra\, tensor decomposition\, tensor eigenvalues\, graph algorithms\, machine learning\, network science\, derivative-free optimization\, computational optimization\, distributed and parallel computing. \nMs. Kolda will talk about “Optimization Approaches for Fitting the Canonical Tensor Decomposition.” More specifically\, she will speak about \n\nthe theory and background of the CP decomposition\nstandard approaches such as alternating least squares and all-at-once optimization\nhandling missing data\npractical approaches to choosing the rank\nalternative objective functions for other statistical models/assumptions\nTime permitting\, she may also talk about HPC\, data structures\, parallelization\n\n  \nStephen J. Wright\, University of Wisconsin-Madison \n \nHis research interests are in continuous optimization algorithms and their applications. He works on devising algorithms for fundamental problems in continuous optimization (with practical relevance) and in understanding their theoretical properties. He also enjoys working with domain scientists and engineers in such areas as data analysis and machine learning\, machine learning\, process control\, and computer architecture to solve problems in these areas using formulation and solution techniques from optimization. \nMr. Wright will cover the background of fundamental algorithmic approaches that are relevant to data analysis problems. Topics will include the following: \n– first-order (gradient) methods for smooth unconstrained   minimization. \n    Steepest descent\, accelerated gradient and other momentum methods. \n– minimization of objectives with “simple” regularization terms using \n    forward-backward/prox-linear methods. \n– stochastic gradient and subgradient methods for minimizing convex objectives with “summation” form. \n– second-order methods for smooth (convex and nonconvex) objectives.  Newton’s method and methods that explicitly use \n   negative curvature information. \nWe will also give a survey of current use of optimization methodology in data analysis. \n  \nOrganizers:  \n  \nJan Pablo Burgard\, Ralf Münnich\, Ekkehard Sachs\, Volker Schulz\, Sven de Vries  \nSchedule\, Location and Travel Information:  \n  \nFeel free to download a copy of the schedule here:  Autumn School 2017 Program \nThe workshop is scheduled to begin on Monday\, August 28 at 9:00 am and end on Thursday\, August 31 in the afternoon.\n The workshop will take place in Building E located on Campus I at Trier University. \n For travel tips on how to get to Trier\, please check  here;\n Instructions on how to find Campus I are located here. \n \n  \nHotel Room Reservations \nWe have a reserved a hotel room contingent at the Altstadt Hotel\, Am Porta Nigra Platz\, 54292 Trier. Please contact them directly to make your reservations referencing the AUTUMN SCHOOL 2017. \nThe contingent will be available for reservation until August 1\, 2017\, or until all available rooms have been booked. \nRegistration information: \nThere will be a registration fee of 70 €. Detailed payment information will be communicated upon registration. \nQualified participants may be eligible for a stipend to assist with travel expenses. In order to be considered for the stipend\, please submit a CV (which should include the names and contact information of two professional references) along with a one-page letter of motivation before June 15\, 2017. \nRegistration is closed
URL:https://alop.uni-trier.de/event/autumn-school-optimization-in-machine-learning-and-data-science/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Workshop
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170908T100000
DTEND;TZID=Europe/Berlin:20170908T120000
DTSTAMP:20170620T094938Z
CREATED:20170426T141532Z
LAST-MODIFIED:20170620T094938Z
UID:1246-1504864800-1504872000@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Tim Kelley
DESCRIPTION:On Friday\, September 8\, 2017\, Prof. Tim Kelley of North Carolina State University  will join the ALOP-Colloquium and present his recent work entitled \n  \nAnderson Acceleration \n  \nAbstract: \n  \nWe will discuss recent results on the local convergence of Anderson Acceleration. This is an algorithm for accelerating the convergence of fixed point or Picard iteration. In this talk we will discuss the first convergence results for the method\, illustrate the results with an application to radiative transport\, discuss issues with multi-physics coupling\, and list a few open questions \nThe presentation will take place in HS9. \nPlease join us for coffee at 9:45 in E10. \n  \n 
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-tim-kelley/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20171023T160000
DTEND;TZID=Europe/Berlin:20171023T180000
DTSTAMP:20171013T104735Z
CREATED:20171011T115612Z
LAST-MODIFIED:20171013T104735Z
UID:1504-1508774400-1508781600@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Prof. MK (Mapundi) Banda
DESCRIPTION:On Monday\, October 23\, 2017\, at 16:00 Prof. MK (Mapundi) Banda of the University of Pretoria will join the ALOP-Colloquium and present his recent work entitled \nOptimal Control\, Stabilization and Parameter Identification for evolution models \nEvolution models governed by the time-dependent partial differential equations will be considered. In this talk\, we will present some ideas on optimal control\, boundary stabilization and parameter identification for a selection of such models.  For instance\, boundary information will be used to stabilise or to identify parameters of the models.  The first part of the presentation will discuss numerical optimal control and stabilisation of hyperbolic conservation laws.  The second part will discuss how boundary measurements can be used to simultaneously identify a coefficient and an initial condition of a parabolic partial differential equation using an identification algorithm.  Numerical algorithms will be discussed and the effectiveness of the proposed algorithms will also be demonstrated. \nThe presentation will take place in HS9. \nPlease join us for coffee at 15:45 in E10.
URL:https://alop.uni-trier.de/event/alop-colloquium-prof-mk-mapundi-banda-university-of-pretoria/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20171106T160000
DTEND;TZID=Europe/Berlin:20171106T170000
DTSTAMP:20170921T104958Z
CREATED:20170912T121756Z
LAST-MODIFIED:20170921T104958Z
UID:1447-1509984000-1509987600@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Dr. Venera Khoromskaia
DESCRIPTION: Dr. Verena Khoromskaia of the Max-Planck-Institute für Mathematik in den Naturwissenschaften will join the ALOP-Colloquium and present her recent work entitled \nTensor numerical methods in computational quantum chemistry \non Monday\, November 6\, 2017 at 16:00.  \nWe will meet for coffee prior to her presentation at 15:45 in room E10. The presentation will take place in HS9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-dr-venera-khoromskaia/
CATEGORIES:Colloquium
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