Tidlegare arrangement - Side 90
Variable selection methods based on L0 penalties have excellent theoretical properties to select sparse models in a high-dimensional setting. There exist modifications of BIC which either control the family wise error rate (mBIC) or the false discovery rate (mBIC2) in terms of which regressors are selected to enter a model. However, the minimization of L0 penalties comprises a mixed integer problem which is known to be NP hard and therefore becomes computationally challenging with increasing numbers of regressor variables. This is one reason why alternatives like the LASSO have become so popular, which involve convex optimization problems which are easier to solve. The last few years have seen some real progress in developing new algorithms to minimize L0 penalties. We will compare the performance of these algorithms in terms of minimizing L0 based selection criteria.
Simulation studies covering a wide range of scenarios which are inspired by genetic association studies are used to compare the values of selection criteria obtained with different algorithms. Additionally some statistical characteristics of the selected models and the runtime of algorithms are compared.
We have the pleasure to invite you to an extended webinar on Electron Nanoscopy and structural characterization of novel materials to be held on Wednesday, 5 April.
Maciej Lisicki is an Associate Professor at the Institute of Theoretical Physics, Faculty of Physics University of Warsaw
Hylleraas seminar, hosted in Tromsø
Nicolas Poirier, Ph.D. fellow at Rosseland Centre for Solar Physics, University of Oslo.
Ivar Thokle Hovden will defend his thesis “Structural and functional tracking in longitudinal magnetic resonance imaging of glioblastoma” for the degree of Philosophiae Doctor at the University of Oslo, Faculty of Mathematics and Natural Sciences.
Felleskollokvium by Dr. James Catmore, Dept. of Physics, UiO
Welcome to a full day seminar on solar cell materials arranged by the MATS project and the SOLARIS initiative. The seminar will give an insight into what is going on in the field in Europe, also including high throughput exploration of new materials.
SPARK Norway Educational Forum are monthly open meetings organized by UiO:Life Science and SPARK Norway partners.
João Inácio:
The field of low-dimensionality magnetism has developed into an active area of solid-state physics, attracting both theoretical and experimental researchers. Due to the vast array of theoretical tools, there is a large effort to develop a full theoretical understanding of one-dimensional (1D) systems. A large part of this interest is due to nonequilibrium dynamics, where steady-state transport is a generic example.
Many physically relevant 1D models are Bethe-ansatz integrable, such as the spin-1/2 XXZ-model and the Fermi-Hubbard model, but computing transport coefficients still poses a great challenge. Moreover, little is currently known about transport properties of non-integrable models, such as the spin-S XXZ-model or ladder spin systems.
Lecturer: Christa Cuchiero (University of Vienna)
Doctoral candidate Raluca Madalina Florea at the Department of Informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis The Software Tester: An Exploration of the Skills and Practice of the Role for the degree of Philosophiae Doctor.
QOMBINE seminar talk by Vebjørn Hallberg Bakkestuen (UiO)
Matematisk-naturvitenskapelig fakultet på UiO og Institutt for grunnskole- og faglærerutdanning på OsloMet ønsker å etablere et nettverk for lærerutdannere som underviser lærerstudenter for trinn 1.-13. (grunnskole og vgs) i programmering i matematikk, naturvitenskap og teknologi. Målet med nettverket er å bidra til kunnskap- og erfaringsutveksling mellom de ulike lærerutdanningsinstitusjonene om undervisning og FoU knyttet til programmering i realfag.
Det er fort gjort å la seg blende av alle mulighetene moderne språkmodeller som ChatGPT fører med seg, men det er ikke til å komme fra at de også byr på visse utfordringer i høyere utdanning, spesielt knyttet til undervisning og vurdering.
During the Tuesday talks, CBA members gather for lunch and a talk. On Mars 28th 2023, the talk will be given by new CBA leader Sebastian Westermann and new centre coordinator Manon Bajard who will introduce themselves.
Jessica Lönn-Stensrud talks about her method for communication at the Communication Forum at MN at the Science Library, where you can meet colleagues with an interest in communication, for mutual inspiration and exchange of experience.
Kom og se Thomas mot Thomas i Store fy den 27.mars kl. 17.00. Etter filmen blir det liveinnspilling av podkasten God fysikk. Her har podkastvert Ida Storehaug med seg Are Raklev og Anders Kvellestad for å diskutere tolkninger av kvantefysikk.
Doctoral candidate Håkon Strand Bølviken at the Department of Informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Tailoring Deformable Models to Extract Meaningful Metrics and Landmarks from 3D Echocardiograms for the degree of Philosophiae Doctor.
Omid Mirmotahari: For feedback processes to be enhanced, students need both appreciation on how feedback can operate effectively and strategies to use feedback within the curriculum. Several studies that examined feedback exchanged during student peer-review process have shown some challenges regarding students’ confidence in their own knowledge to perform assessment.
It has also been found that, due to students’ negative perception of their own level of competence, they have limited confidence in their fellow students assessing their assignment. Lack of clarity about assessment criteria and standards are a source of anxiety for many first-year university students.
Sidney Nagel is an Stein-Freiler Distinguished Service Professor
The James Franck Institute, The Enrico Fermi Institute, and the Department of Physics at the The University of Chicago
Master Anna Young ved Institutt for litteratur, områdestudier og europeiske språk vil forsvare sin avhandling for graden Philosophiae Doctor (PhD): Unaccountable Violence: The Murderous Child in the British and American Novel, 1954-2003.
Hylleraas seminar, hosted in Oslo
Doctoral candidate Bjørn Skauli at the Department of Mathematics will be defending the thesis Rationality Properties of Some Hypersurfaces and Complete Intersections for the degree of Philosophiae Doctor.
/2023/wietseboon.jpg?alt=listing)
Constructing fast solution schemes often involves deciding which errors are acceptable and which approximations can be made for the sake of computational efficiency. Herein, we consider a mixed formulation of Darcy flow in porous media and take the perspective that the physical law of mass conservation is significantly more important than the constitutive relationship, i.e. Darcy's law. From this point of view, we propose an inexact solution technique that nevertheless guarantees local mass conservation. The method is based on first solving the mass balance equation and then computing a solenoidal correction using the curl of a potential field. We extend the method to flows in fractured porous media and present numerical experiments that indicate the efficiency of the scheme.