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November 2017

ALOP-Colloquium with Prof. Boris N. Khoromskij

6. November 2017 / 17:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany

On Monday, November 6, 2017,  Prof. Dr. Boris Khoromskij from the Max-Planck-Institute für Mathematik in den Naturwissenschaften will join the ALOP-Colloquium and present his recent work entitledTensor numerical methods for multi-dimensional PDE's and in data modelingon Monday, November 6, 2017 at 17:00.  The presentation will take place in HS9.

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ALOP-Colloquium with Prof. John Pearson

20. November 2017 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, November 20, 2017, at 16:00  Prof. John Pearson of School of Mathematics, The University of Edinburgh will join the ALOP-Colloquium and present his recent work entitledFour Perspectives on Preconditioning PDE-Constrained Optimization ProblemsAbstract:PDE-constrained optimization problems have a wide range of applications across numerical mathematics and applied science, so it is important to develop fast and feasible methods to solve such problems. We employ preconditioned iterative methods to tackle the large and sparse matrix systems that arise from their discretization,…

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December 2017

ALOP-Colloquium with Prof. Ekaterina Kostina

4. December 2017 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, December 4, 2017, at 16:00 Prof. Ekaterina Kostina of Heidelberg University will join the ALOP-Colloquium and present her recent work entitled Optimization-Based Model Validation - a Mathematical Technology of High ImpactValidated dependable mathematical models are of ever growing importance in science and engineering, and today also driven by a serious demand of the industry. Apart from providing scientific insight into complex nonlinear processes, mathematical models are fundamental for process simulation, optimization and control. In this context the new paradigmatic…

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January 2018

ALOP-Colloquium with Prof. Andrea Walther

22. January 2018 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, January 22, 2018, at 16:00 Prof. Andrea Walther of Paderborn University will join the ALOP-Colloquium and present her recent work entitled:Recent progress in the optimization of piecewise smooth functionsIn a previous paper, we derived first and second order convexity conditions for a large class  of piecewise smooth functions.In that analysis based on piecewise linearization, a key assumption was the Linear Independence Kink Qualification (LIKQ), a generalization of the Linear Independence Constraint Qualification (LICQ) known from smooth nonlinear optimization.…

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February 2018

ALOP- Colloquium with Prof. Fredi Troeltzsch

6. February 2018 / 12:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Tuesday, February 6, 2018, at 12:00  Prof. Fredi Tröltzsch of TU Berlin will present his recent work entitled Optimal and Feedback Control of some Reaction-Diffusion EquationsThe optimal control of some systems of nonlinear reaction-diffusion equations is considered including several important equations of mathematical physics. In particular, equations are covered that develop traveling wave fronts, spiral waves, scroll rings, or propagating spot solutions. Well-posedness of the system, differentiability of the control-to-state mapping, and optimality conditions of first and second order are…

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ALOP-Colloquium with Prof. Dr. Geovani Grapiglia

26. February 2018 / 16:00 - 18:00
Trier University, E Building, Universitätsring 15
Trier, Germany
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Prof. Dr. Geovani Grapiglia of the Universidade Federal do Parana in Curitiba, PR, Brasil will visit with the students of the RTG ALOP to discuss his research as well as speak during our colloquium on the topic of Improved Optimization Methods for Image Registration Problems   Abstract: In many applications, multiple images of the same subject are obtained at different moments in time and under different conditions. The goal is to identify changes in the subject over time. For a…

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March 2018

Prof. Juan Vera and Olga Kuryatnikova of Tilburg University to visit in March

5. March 2018 - 6. March 2018
Trier University, E Building, Universitätsring 15
Trier, Germany
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Prof. Juan Vera and Olga Kuryatnikova of Tilburg University are scheduled to visit the Research Training Group ALOP in March for research collaboration.   During their visit, they will speak on the following topics:   Copositive certificates of non-negativity (Prof. Juan Vera) Abstract: Sum-of-squares (sos) certificates of non-negativity, such as Putinar's Positivstellensatz, have been used to obtain powerful numerical techniques to solve polynomial optimization (PO) problems. Using such certificates, hierarchies of semidefinite relaxations are obtained for PO. Usually the use…

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April 2018

ALOP-Colloquium with Prof. Michael Günther

16. April 2018 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, April 16, 2018, at 16:00 Prof. Michael Günther of Bergische Universität Wuppertal will join the ALOP-Colloquium and present his recent work entitled Effiziente numerische Simulation multiphysikalischer Systeme Multiphysikalische Systeme werden oft durch Modelle beschrieben, die DAE-Netzwerkmodelle mit partiellen Differentialgleichungen über geeignete Randbedingungen und Quellterme koppeln. Nach Semidiskretisierung im Ort hat man es dann mit großen, gekoppelten DAE-Sytemen zu tun. In diesem Vortrag werden verschiedene Ansätze zu deren effizienter numerischer Simulation besprochen: Multirate-Verfahren und dynamsche Iteration.   The presentation…

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May 2018

ALOP-Colloquium with Kerstin Lux

7. May 2018 / 16:00 - 18:00

On Monday, May 7, 2018, at 16:00, Kerstin Lux of Universität Mannheim will join the ALOP-Colloquium and present her recent work entitled "Optimal inflow control in supply systems with uncertain demands." Abstract: We are concerned with optimal control strategies subject to uncertain demands. They have a broad range of applications. Taking uncertainty into account becomes more and more important in many areas. In the context of supply chain management, a need for control strategies taking these uncertainties into account naturally…

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ALOP-Colloquium with Prof. Partha Lahiri

14. May 2018 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, May 14, 2018, at 16:00,  Prof. Partha Lahiri of the University of Maryland College Park will join the ALOP-Colloquium and present his recent work entitled "Big data in official statistics." Abstract:  The demand for various socio-economic, transportation, and health statistics for small geographical areas is steadily increasing at a time when survey agencies are desperately looking for ways to reduce costs to meet fixed budgetary requirements.  In the current survey environment, the application of standard sample survey methods…

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June 2018

ALOP-Colloquium with Mehiddin Al-Baali

28. June 2018 / 16:00 - 17:30

On Thursday, June 28, 2018, at 16:00 c.t. Prof. Mehiddin Al-Baali, Department of Mathematics and Statistics, Sultan Qaboos University, Muscat, Oman will present his recent work entitled  On the Damped Technique, Self-Scaling and their Combination when Introduced to the Broyden Family of Methods for Unconstrained Optimization Recently, we have extended the damped-technique in the modified BFGS method of Powell for constrained optimization to the Broyden family of quasi-Newton methods for unconstrained optimization. Appropriate choices for the damped parameter will be…

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October 2018

ALOP Colloquium with Arie M.C.A. Koster

29. October 2018 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, October 29, 2018 at 16:00 c.t. Prof. Dr. Ir. Arie M.C. A. Koster  of RWTH Aachen will present his recent work entitled Robust Combinatorial Optimization - New Problems and Solutions Abstract: The growing need to deal with uncertainties in optimization processes has lead to many new research directions. In robust optimization, an uncertainty set has to be defined containing all scenarios to be considered. Availability of historical data often suggests the use of a discrete or polyhedral uncertainty…

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November 2018

ALOP Colloquium with Caroline Geiersbach

26. November 2018 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, November 26, 2018 at 16:00 c.t.  Caroline Geiersbach of Universität Wien will present her recent work entitled   Stochastic Approximation for Shape Optimization     The presentation will take place in HS 9. Please join us for coffee at 15:45 in E10.

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December 2018

ALOP Colloquium with Frank Vallentin

3. December 2018 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, December 3, 2018 at 16:00 c.t. Prof. Dr. Frank Vallentin of Universität Köln will present his recent work entitled "Chromatic numbers of geometric graphs" Abstract: A classical problem in discrete geometry (due to Hadwiger and Nelson) is to find the minimal number of colors one needs to color all points in the Euclidean plane so that no two points which are distance 1 apart receive the same color. Similar geometric coloring problems can be posed in the context…

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ALOP Colloquium with Ingenuin Gasser

6. December 2018 / 16:00 - 18:00

On Thursday, December 6, 2018 at 16:00 c.t.  Prof. Gasser of Universität Hamburg will present his recent work entitled   Modelling, simulation and optimisation of power plants based on renewable energies   Abstract: In this seminar we discuss the fluid dynamics of  parabolic trough, solar updraft towers, energy towers and osmotic power stations.  The main issue is to discuss simple fluid dynamic models which on one hand describe the main features of the mentioned applications and on the other allow…

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January 2019

ALOP Colloquium with Martin Gugat, FAU Erlangen

28. January 2019 / 16:00 - 18:00
Trier University, E Building, Universitätsring 15
Trier, Germany
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On Monday, January 28, 2019 at 16:00 c.t.  Prof. Dr. Martin Gugat of FAU Erlangen will present his recent work entitled   On the limits of boundary stabilizability for networks of strings.   Abstract: An example by Bastin and Coron illustrates that theboundary stabilization of 1-d hyperbolic systemswith certain source terms is only possible if the lengthof the space interval is sufficiently small. We show that simlar phenomena also occur fornetworks of vibrating strings that are governedby the wave equation with…

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April 2019

ALOP Colloquium with Florian Jarre, Universität Düsseldorf

29. April 2019 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, April 29 2019 at 16:00 c.t. Prof. Florian Jarre  of  Universität Düsseldorf will present his recent work. Stochastic gradient descent und Block coordinate descent -- eine Einführung in die Theorie und die praktische Anwendung   Der Vortrag befasst sich mit extrem hoch-dimensionalen speziell strukturierten Minimierungsproblemen, für die selbst die Auswertung eines einzelnen Funktionswertes oft so viel Rechenzeit beansprucht, dass neue iterative Verfahren zum Einsatz kommen, bei denen die einzelnen Iterationen billiger sind als eine Funktionsauswertung. Natürlich kann man…

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May 2019

ALOP Colloquium with Christian Meyer, TU Dortmund

6. May 2019 / 16:00 - 17:30
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, May 6 2019 at 16:00 c.t. Prof. Dr. Christian Meyer of TU Dortmund will present his recent work entitled Optimal control of a non-smooth semi-linear elliptic equation   The presentation will take place in HS 9.   Please join us for coffee at 15:45 in E10.

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June 2019

ALOP Colloquium with Barbara Kaltenbacher, Universität Klagenfurt

17. June 2019 / 16:00 - 17:30
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, June 17 2019 at 16:00 c.t. Prof. Dipl.-Ing. Dr. Barbara Kaltenbacher of AAU Klagenfurt will present her recent work entitled Optimization based formulation and regularization of inverse problems Abstract:   The conventional way of formulating inverse problems such as identification of a (possibly infinite dimensional) parameter, is via some forward operator, which is the concatenation of the observation operator with the parameter-to-state-map for the underlying model. Recently, all-at-once formulations have been considered as an alternative to this reduced…

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July 2019

ALOP Colloquium with Christopher Hojny, TU Darmstadt

1. July 2019 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, July 1 2019 at 16:00 c.t.  Dr. Christopher Hojny, TU Darmstadt  will present his recent work entitled Symmetry Handling in Binary Programs - Combining Symretopes and Orbital Fixing   Abstract: Branch-and-bound is an established method to solve binary programs with thousands of variables in adequate time. If symmetries are present, however, even small instances may be hard to solve, because symmetric parts of the branch-and-bound tree are inspected repeatedly without providing new information. A standard way to handle symmetries…

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November 2019

ALOP Colloquium with Prof. Dr. Volker Kaibel

4. November 2019 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, November 4 2019 at 16:00 c.t.  Prof. Dr. Volker Kaibel, Otto-von-Guericke-Universität Magdeburg  will present his recent work entitled   Projections in Combinatorial Optimization Formulating problems via linear inequalities and projections is at the heart of the polyhedral combinatorics approach to Combinatorial Optimization. We present some examples for which this can be achieved with surprisingly few inequalities and we give an almost pictorial proof showing that for other problems exponentially many inequalities are required.   The presentation will take…

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December 2019

ALOP Colloquium with Timm Faulwasser

2. December 2019 / 9:00 - 10:00

On Monday, December 2 2019 at 9:00 c.t.  Prof. Dr. -Ing. Timm Faulwasser, TU Dortmund will present his recent work entitled Dissipativity and Turnpike Properties in Optimal Control – Insights and Open Problems In many engineering disciplines and beyond (economics, physics, …) performance optimization under explicit consideration of dynamics and operational constraints, i.e. optimal control, plays a pivotal role. The last 60 years have seen tremendous progress in terms of optimality conditions and PMP formulations, and in terms of powerful…

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ALOP Colloquium with Stefan Weltge

4. December 2019 / 12:00 - 14:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Wednesday, December 4, 2019 at 12:00 c.t., Prof. Dr. Stefan Weltge, Assistant Professor at Technical University Munich (TUM) will present his recent work entitled Persistency of Linear Programming Relaxations for Stable Set Abstract:   The Nemhauser-Trotter theorem states that the standard linear programming (LP) relaxation for the stable set problem has a remarkable property, also known as the (weak) persistency property:  for every optimal LP solution that assigns integer values to some variables, there exists an optimal integer solution…

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ALOP Colloquium with Martine Labbé

19. December 2019 / 16:00 - 17:00
Trier University – E-Building – HS 9, Universität Trier Gebäude E
Trier, Rhineland-Palatinate 54296 Germany
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On Thursday, December 19 2019 at 16:00 c.t.  Dr. Martine Labbé, Université Libre de Bruxelles  will present her recent work Title and Abstract will follow.   The presentation will take place in HS 9. Please join us for coffee at 15:45 in E10.

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February 2020

CANCELLED – ALOP Colloquium with Shengfeng Zhu

10. February 2020 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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CANCELLED DUE TO THE CURRENT TRAVEL RESTRICTIONS IN CHINA This presentation will be rescheduled at a later time. On Monday, February 10 2020 at 16:00 c.t.  Dr. Shengfeng Zhu of East China Normal University will present his recent work entitled Finite element approximations of shape gradients with applications in shape optimization  Abstract: Shape optimization has many practical applications in science and engineering. Boundary type Eulerian derivative has been widely used in shape gradient algorithms. The distributed Eulerian derivative is seldom…

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ALOP Colloquium with Marianna de Santis

24. February 2020 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, February 24 2020 at 16:00 c.t.  Dr. Marianna de Santis, Università de Roma, DIAG  will present her recent work entitled Branch-and-bound Algorithms for structured Mixed Integer Nonlinear Programming Problems Abstract: Mixed Integer Nonlinear Programming (MINLP) is the area of optimization  that addresses nonlinear problems with continuous and integer variables.  MINLP has proven to be a powerful tool for modeling and it combines challenges from both combinatorial and nonlinear optimization. In this talk, we deal with the computation of…

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March 2020

ALOP Colloquium with Hanno Gottschalk

3. March 2020 / 16:00 - 18:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Tuesday, March 3 2020 at 16:00 c.t.  Prof. Dr. Hanno Gottschalk  , Bergische Universität Wuppertal  will present his recent work. entitled False Positives and False Negatives in Semantic Segmentation: Toward the assurance of the perception with deep CNN in atonomous driving Abstract: The application of machine learning technology in safety relevant environments poses several challenges regarding their reliability. This especially applies to modern deep learning architectures, which pretty much resemble a black box. In this talk, measures of uncertainty…

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June 2020

ALOP Colloquium with Prof. Andrés Gómez

15. June 2020 / 17:00 - 18:00

Assistant Professor Andrés Gómez of Daniel J. Epstein Department of Industrial and Systems Engineering, University of Southern California, will speak at our colloquium on June 15, 2020 at 5 pm about his research via ZOOM. Title: Sparse learning via mixed-integer optimization.   Abstract: This talk addresses inference problems in which sparsity plays a fundamental role. Sparse statistical models are interpretable by design and often have improved out-of-sample performance than dense models, but learning a sparse model model from data often…

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ALOP-Colloquium with apl. Prof. Martin Gugat

22. June 2020 / 16:00 - 17:00

On Monday, June 22. 2020 at 16:00 c.t.  apl. Prof. Martin Gugat,  FAU Erlangen-Nuernberg will present his recent work and speak on the following topic:   The finite time turnpike phenomenon for optimal control problems Abstract: Often in dynamic optimal control problems with a long time horizon, in a large neighburhood of the middle of the time interval the optimal control and the optimal state are very close to the solution of a static control problem that is derived from…

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ALOP-Colloquium with Prof. Dr. Luise Blank

29. June 2020 / 16:00 - 18:00

On Monday, June 29. 2020 at 16:00 c.t.  Prof. Dr. Luise Blank with the Universitaet Regensburg will present her recent work at our colloquium entitled Optimization with convex constraints and an application in topology optimization This talk focuses on projection type methods for convexly constrained optimization problems. We shortly introduce well known projection methods using the gradient in finite dimensions and summarize known results. Varying the underlying scalar product allows to include second order information to speed up the method. E.g.…

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July 2020

ALOP-Colloquium with Julia Gruebel, M.Sc., FAU Erlangen-Nuernberg

13. July 2020 / 16:00 - 17:00

On Monday, July 13. 2020 at 16:00 c.t.  Julia Gruebel, FAU Erlangen-Nuernberg will present her recent work via a ZOOM presentation. Titel: On Electricity Market Equilibria with Storage: Modeling, Uniqueness, and a Distributed ADMM  Abstract: This talk focuses on spot-market trading of electricity including storage operators as additional agents besides producers and consumers. Storage devices allow for shifting produced electricity from one time period to a later one. Due to this, multiple market equilibria may occur even if classical uniqueness…

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ALOP-Colloquium with Mathieu Besançon

20. July 2020 / 16:00 - 18:00

On Monday, July 20. 2020 at 16:00 c.t.  Mathieu Besançon of INRIA will present his recent work at our colloquium: Near-optimality robustness in bilevel optimization   Bilevel optimization studies problems where the optimal response to a second mathematical optimization problem is integrated in the constraints. We introduce near-optimal robustness for bilevel problems, protecting the upper-level decision-maker from bounded rationality at the lower level. This model finds a corresponding and intuitive interpretation in various situations cast as bilevel optimization problems. We…

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November 2020

ALOP-Colloquium with Prof. Dr. Volker Mehrmann, TU Berlin

9. November 2020 / 16:00 - 18:00

On Monday, November 9. 2020 at 16:00 c.t. Prof. Dr. Volker Mehrmann, TU Berlin will present his recent work at our colloquium entitled Hierarchical energy based modeling, simulation and control  of multi-physics systems. Abstract:   The next level of digitization will create digital twins of every product or process. To do this in a mathematical rigorous and risk and error controlled way, a new modeling, simulation and optimization paradigm is needed. While automated modularized modeling is common in some domains like…

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ALOP-Colloquium with Prof. Dr. Rakesh Vohra, University of Pennsylvania

23. November 2020 / 16:00 - 18:00

On Monday, November 23, 2020 at 16:00  Prof. Dr. Rakesh Vohra, University of Pennsylvania will present his recent work at our colloquium entitled   Linear Programming and Prophet Inequalities   Prophet inequalities bound the expected reward that can be obtained in a class of stopping problems by the optimal reward of the corresponding off-line problem. We use linear programming techniques to obtain prophet inequalities for a class of stopping problems associated with selecting a point in a polyhedron. One application…

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December 2020

ALOP-Colloquium with Dr. Christina Schenk, Basque Center for Applied Mathematics

7. December 2020 / 16:00 - 18:00

On Monday, December 7,  2020 at 16:00 c.t. Dr. Christina Schenk will present her recent work titled "Population Balance Modeling, Simulation and Optimization: From Wine Fermentation to Polymerization" at our colloquium. Abstract: The continuous increase of energy consumption and pollution by carbon dioxide emissions worldwide requires improvements in terms of energy efficiency and advanced materials. Within the scope of this talk we look at different aspects regarding mathematical modeling, simulation and optimization for several industrial applications. The proposed mathematical advances…

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ALOP-Colloquium with Prof. Dr. Falk Hante, HU Berlin

14. December 2020 / 16:00 - 18:00

On Monday, December 14, 2020 at 16:00, Prof. Dr. Falk Hante, Humbold Universität zu Berlin will present his recent work at our colloquium.   Title: Sequential action control for stabilization of PDE-dynamical systems We present sequential action control as a framework suitable for control and stabilization of PDE-dynamical problems. As a variant of a moving horizon method, but in contrast to classical model predictive control approaches, the control synthesis does not require to compute solutions of dynamic optimization problems. Moreover,…

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January 2021

ALOP-Colloquium with Prof. Dr. Steven Gabriel, University of Maryland

25. January 2021 / 16:00 - 18:00

On Monday, January 25, 2021 at 16:00 c.t. Prof. Dr. Steven Gabriel of the University of Maryland , Baltimore will present his recent work at our colloquium entitled   A parametric programming approach to bilevel optimisation with lower-level variables in the upper level This paper examines linearly constrained bilevel programming problems in which the upper-level objective function depends on both the lower-level primal and dual optimal solutions. We parametrize the lower-level solutions and thereby the upper-level objective function by the…

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April 2021

ALOP-Colloquium with Prof. Dr. Tobias Harks, Augsburg University

19. April 2021 / 16:00 - 17:00

On Monday, April 19, 2021 at 16:00 c.t. Prof. Dr. Tobias Harks of Augsburg University will present his recent work at our colloquium entitled   Pricing in Resource Allocation Games We consider a basic resource allocation game, where the players’ strategy spaces are subsets of R^m and cost/utility functions are parameterized by some common vector u \in∈ R^m and, otherwise, only depend on the own strategy choice. A strategy of a player can be interpreted as a vector of resource…

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ALOP-Colloquium with Dr. Ritesh Kumar Dubey of SRM University Chennai

26. April 2021 / 16:00 - 17:00

On Monday, April 26, 2021 at 16:00 c.t.  Dr. Ritesh Kumar Dubey of SRM University Chennai will present his recent work at our colloquium.    Title of the Talk: On numerical diffusion for entropy stable shock capturing schemes for hyperbolic conservation laws One of the fundamental problems associated with the solution of hyperbolic conservation laws is the presence of inevitable discontinuities in it. This poses various challenges for the numerical approximation of such admissible solutions which eventually demand to construct…

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May 2021

ALOP-Colloquium with Prof. Dr. Bijan Mohammadi, Montpellier University

3. May 2021 / 16:00 - 17:00

On Monday, May 3, 2021 at 16:00 c.t. Prof. Dr. Bijan Mohammadi, Montpellier University, will present his recent work at our colloquium.  He will speak about Variational nearshore dynamics  Abstract: Minimization principles are used in fluid-structure coupling to model sandy sea beds  evolution.The sandy bed is seen as a structure with low stiffness. We start with a model problem featuring the behavior of the coupling.Then water motion in shallow domains is described by the Saint Venant equations.This coupling bringing the…

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ALOP-Colloquium with Pascal Van Hentenryck, Georgia Tech

10. May 2021 / 16:00 - 17:00

On Monday, May 10, 2021, Prof. Dr. Pascal Van Hentenryck, Georgia Tech will present his recent research titled: Differential privacy of hierarchical Census data: An optimization approach This talk considers applications of a Census Bureau interested in releasing aggregate socio-economic data about a large population without revealing sensitive information about any individual. The released information can be the number of individuals living alone, the number of cars they own, or their salary brackets. Recent events have identified some of the…

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ALOP-Kolloquium with Oliver Stein, Karlsruher Institut für Technologie (KIT)

17. May 2021 / 16:00 - 17:00

On Monday, May 17, 2021 at 16:00 c.t. Prof. Dr. Oliver Stein, Karlsruher Institut für Technologie (KIT) will present his recent work at our colloquium titled:  The granularity concept in mixed-integer optimization Granularity is a geometrically motivated concept which relaxes the difficulties imposed by integrality conditions and often provides ways for determining good feasible points of mixed-integer optimization problems at low computational cost. We explain how this concept leads to algorithms for the computation of feasible points in mixed-integer linear, convex,…

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June 2021

ALOP-Colloquium with Laura Albert, University of Wisconsin-Madison

14. June 2021 / 16:00 - 17:00

On Monday, June 14, 2021 at 16:00 c.t.  Prof. Dr. Laura Albert, University of Wisconsin-Madison will present her recent work at our colloquium.  She will speak on a very popular contemporary topic Supporting academic researchers during the COVID-19 pandemic and beyond Abstract The literature documents the many challenges faced by faculty from marginalized groups in terms of their hiring, retention, and advancement. The COVID-19 global pandemic has exasperated these inequities and has created serious challenges for many academic researchers, especially…

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July 2021

ALOP-Colloquium with Frauke Liers, FAU Erlangen-Nürnberg

5. July 2021 / 16:00 - 17:00

On Monday, July 5, 2021 at 16:00 c.t.  Prof. Dr. Frauke Liers with FAU Erlangen-Nuernberg will present her recent work at our colloquium. She will speak on the topic of   Data-Driven Robust Protection for Uncertain Optimization Problems   One way of protecting against uncertainties that occur in real-world applications is to apply and to develop methodologies from robust optimization that determine best possible robust solutions that are feasible regardless of how uncertainties manifest themselves within predefined uncertainty sets. However,…

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November 2021

ALOP-Colloquium with Daniel Aloise, Polytechnique Montréal

8. November 2021 / 16:00 - 17:00

On Monday, November 8, 2021 at 16:00 c.t.  Dr. Daniel Aloise, Polytechnique Montréal will present his recent work at our colloquium.  Title: Convex fuzzy k-medoids clustering Abstract: K-medoids clustering is among the most popular methods for cluster analysis, but it carries several assumptions about the nature of the latent clusters. In this work, we introduce the Convex Fuzzy k -Medoids (CFKM) model, whose underlying formulation not only relaxes the assumption that objects must be assigned entirely to one and only one…

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ALOP-Colloquium with Sungho Shin, University of Wisconsin-Madison

15. November 2021 / 16:00 - 17:00

On Monday, November 15, 2021, at 16:00 c.t., Ph.D. candidate Sungho Shin, University of Madison-Wisonsin will speak about his recent work:   Title: Graph-Structured Nonlinear Programming: Properties and Algorithms   A graph-structured nonlinear program (NLP) is a nonlinear optimization problem whose algebraic structure is induced by a graph. These problems arise in diverse applications such as dynamic optimization (model predictive control and moving horizon estimation), network optimization (energy systems and supply chain), optimization with embedded discretized partial differential equations, and…

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January 2022

ALOP-Colloquium with Prof. Samuel Amstutz, CMAP – Ecole Polytechnique

January 10 / 16:00 - 17:00

On Monday, January 10, 2022, at 16:00 c.t., Prof. Samuel Amstutz of CMAP - Ecole Polytechnique will speak about his recent work regarding Topology optimization and optimal partitioning with non-local perimeter approximation Topology optimization deals with the optimal design of shapes of unknown topology. For such problems, the perimeter may be considered as penalization to regularize the boundaries and ultimately favor the existence of optimal shapes, but it is difficult to handle directly within algorithms because it is highly sensitive…

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February 2022

ALOP-Colloquium with Prof. Geunyeong Byeon, Arizona State University

February 7 / 16:00 - 17:00

On Monday, February 7, 2022, at 16:00 c.t., Prof. Geunyeong Byeon, Arizona State University will speak about her recent work. Decomposition Methods for Bilevel Problems with Convex Follower Abstract: Bilevel optimization formulates hierarchical decision-making processes that arise in many real-world applications such as in pricing, network design, and infrastructure defense planning. This work considers a class of bilevel optimization problems where the upper level problem features some integer variables while the lower level problem enjoys strong duality. We propose a…

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April 2022

ALOP-Colloquium with Dr. Akhil Vohra, University of Cambridge

April 11 / 16:00 - 17:00
Trier University, E Building, Universitätsring 15
Trier, Germany
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On Monday, April 11, 2022, at 16:00 c.t., Dr. Akhil Vohra, University of Cambridge will speak on the topic of Bayesian Persuasion: Reduced Form Approach. Abstract: We illustrate the usefulness of reduced form representations of Bayesian persuasion problems with two applications. In one, the reduced form representation yields a simple algorithm to determine the support of the optimal solution. In the second, the reduced form leads to a simple greedy algorithm to determine the maximum value a sender can achieve…

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June 2022

ALOP Colloquium with Paul Swoboda

June 13 / 16:00 - 17:00
Trier University E Building, Universitätsring 15
Trier, 54296 Germany
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On Monday, June 13, 2022, at 16.00 c.t. Dr. Paul Swoboda, Max-Planck-Institut für Informatik, Saarland Informatics Campus will present his recent work titled Solving 0-1 ILPs with Binary Decision Diagrams Abstract: We present a Lagrange decomposition method for solving 0--1 integer linear programs occurring in structured prediction. We propose a sequential and a massively min-marginal averaging schemes for solving the Lagrangean dual and a perturbation technique for decoding primal solutions. For representing subproblems we use binary decision diagrams (BDDs), which…

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