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DTSTART;TZID=Europe/Berlin:20250120T160000
DTEND;TZID=Europe/Berlin:20250120T170000
DTSTAMP:20250106T121301Z
CREATED:20250106T121301Z
LAST-MODIFIED:20250106T121301Z
UID:7671-1737388800-1737392400@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Sonja Steffensen
DESCRIPTION:On Monday\, January 20\, 2025 at 16:00 c.t. Dr. Sonja Steffensen\, RWTH Aachen\, will speak at the ALOP Colloquium about her recent work. \n  \nRelaxation Approaches for Nonlinear Sparse Optimization Problems \nAbstract: \nIn many applications\, sparse solutions are favoured over non-sparse solutions with comparable objective value\, as for example in statistical and deep learning applications. One approach to induce sparsity relies on the l_0 norm as an additional term in the objective. Often this semicontinuous function is approximated using the continuous and convex l_1-norm as a surrogate function instead. However\, this can lead to suboptimal results with respect to the sparsity properties of the solution. \nIn this talk\, we will present an alternative exact reformulation (with respect to the l_0 norm)  using non-smooth nonlinear functions to formulate the minimization of the number of non-zero entries. The resulting problem is similar (but not equivalent) to the class of mathematical programs with complementarity constraints (MPCC). As for MPCCs relaxing the problem to a standard nonlinear program we can then apply a general nonlinear solver. In our talk we will discuss and relate the relations between the different reformulations in particular with respect to the original problem. Furthermore\, we accompany the theoretical results by some numerical tests using randomly generated data sets. \n  \nPlease join us at 16:00 c.t. in HS 9.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-sonja-steffensen/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="RTG ALOP at Trier University":MAILTO:ALOP@uni-trier.de
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DTSTART;TZID=Europe/Berlin:20250923T090000
DTEND;TZID=Europe/Berlin:20250926T170000
DTSTAMP:20250923T094025Z
CREATED:20250228T102157Z
LAST-MODIFIED:20250923T094025Z
UID:7677-1758618000-1758906000@alop.uni-trier.de
SUMMARY:International Workshop on Algorithmic Optimization
DESCRIPTION:As the research training group Algorithmic Optimization (ALOP) at Trier University enters its ninth and final year\, we are excited to host our last international workshop on algorithmic optimization. After seven successful international workshops and eight autumn schools\, this event marks a special opportunity to bring together researchers from across the field and to offer perspectives on its future evolution. \nThe workshop will feature a dynamic program\, including invited plenary talks\, contributed talks\, an engaging session with elevator pitches\, and a lively poster session. Covering the full spectrum of algorithmic optimization\, topics will range from mixed-integer programming to optimization with differential equations\, from applications in the energy sector to advancements in machine learning and data science\, as well as from foundational theory to cutting-edge algorithmic developments. \nConfirmed Invited Speakers: \nCarina Costa (State University of Maringá) \nMatthias Heinkenschloss (Rice University) \nMichael Hintermüller (WIAS Berlin) \nMartine Labbé (Université Libre de Bruxelles) \nMarina Leal (Univeritas Miguel Hernández) \nMarianna de Santis (Universitá degli Studi di Firenze) \nJohannes Thürauf (University of Technology Nuremberg) \nKathrin Welker (Helmut Schmidt University) \nOrganizers: \nMartin Schmidt (Trier University) \nVolker Schulz (Trier University) \nSchedule\, Location and Travel Information:  \n \nSchedule will be uploaded later. \nThe workshop will take place in Building E located on Campus I at Trier University. For travel tips on how to get to Trier\, please check here. Instructions on how to find Campus I are located here.  \nProgram: \nThe program and book of abstracts can be found here.
URL:https://alop.uni-trier.de/event/international-workshop-on-algorithmic-optimization/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
ORGANIZER;CN="RTG ALOP at Trier University":MAILTO:ALOP@uni-trier.de
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