Heidelberg Graduate School HGS MathComp

HGS MathComp Events

SS 14WS 14/15SS 15WS 15/16SS 16WS 16/17SS 17WS 17/18
Workshops
info  2nd Workshop on Engine Combustion (ECN 2 - Engine Combustion Network) Prof. Dr. Eva Gutheil Sep. 7-8, 2012 ECTS-Points: 1
Abstract (PDF)
Location:
INF 252
Time:
9:00
ECTS-Points:
1
info  3rd Workshop on Measurement and Computation of Turbulent Spray Combustion (TCS 3) Prof. Dr. Eva Gutheil Sep. 2, 2012 ECTS-Points: 1
Abstract (PDF)
Link for more information
Location:
Rottmannsaal, Heidelberg-Handschuhsheim
Time:
10:00
ECTS-Points:
1
info  Discovering new horizons with deal.II Thomas Wick, Bärbel Janssen, Matthias Maier ECTS-Points: 3
Abstract, registration & information:
The workshop focuses topics like:
- Use cases and applications of the library
- What users think would be useful directions for the library to go into, things that are missing, and possibly getting people together who can help implement those parts
- Newer parts of the library (e.g. massively parallel computing, multiphysics coupling, etc) and how these could help in your programs.

We invite talks and plan discussions by users and existing developers in the following areas:
- use cases and applications of the library
- what users think would be useful directions for the library to go into, things that are missing, and possibly getting people together who can help implement those parts
- newer parts of the library (e.g. hp, multithreading,
optimization, etc) and how these could help in your programs.

Organizers:
Timo Heister (Texas A&M University)
Bärbel Janssen (University of Bern)
Matthias Maier (Heidelberg University)
Thomas Wick (Heidelberg University)
Link for more information
Location:
Interdisciplinary Center for Scientific Computing, INF 368, room 432
Time:
8:00
ECTS-Points:
3
info  Solid State Electrochemistry for Energy Storage and Conversion T. Carraro, W. Chueh, F, Ciucci, G. Gregori ECTS-Points: 2
Abstract, registration & information:
This interdisciplinary workshop covers mathematical modeling and numerical methods applied to electrochemistry as well as the latest advances in experimental techniques and novel ionic materials
Link for more information
Location:
IWR, INF 368, room 432, 69120 Heidelberg
Time:
13:00
ECTS-Points:
2
info  Modeling, Simulation, and Optimization of Uncertain Systems Dr. Christian Kirches Jun. 4-6, 2012 ECTS-Points: 2
Link for more information Location:
Heidelberg Academy of Sciences
Time:
9:00
ECTS-Points:
2
info  Probabilistic forecasting of high-impact extreme weather events Prof. Dr. Tilmann Gneiting, Dr. Thordis L. Thorarinsdottir Apr. 25, 2012 ECTS-Points: 0
Abstract, registration & information:
Accurate forecasts of severe weather events are of crucial societal relevance and require the joint effort of atmospheric and mathematical scientists. High-impact extreme weather events, such as heavy rainfall and/or strong winds are very often associated with intensive atmospheric fronts with strong gradients or deep moist convection. These events are governed by mesoscale atmospheric dynamics, operating on horizontal scales ranging from a few to several hundred kilometers. The understanding of these dynamics and their inclusion in modern numerical weather prediction models is under constant development while statistical simulation methods are called for to explore the interacting dynamics that happen at subgrid-scales. Similarly, statistical post-processing of the outputs of the numerical weather prediction models is an essential component of precise forecasts which aims to correct for possible biases and the imperfect representation of uncertainty in the forecast. This workshop will bring together academic atmospheric scientists and mathematicians, as well as atmospheric scientists from the German Weather Service to discuss the current challenges in predicting severe weather events and to further strengthen the connections between the two disciplines.

http://www.iwh.uni-hd.de/aktuelles/Gneiting.html
Location:
Internationales Wissenschaftsforum Heidelberg, Hauptstrasse 242
Time:
8:30
ECTS-Points:
0
Events
info  Romberg Public Talk: Atomistic-to-Continuum Coupling Methods for Materials Prof. Mitchell Luskin July 17, 16:00 ECTS-Points: 0
Abstract, registration & information:
Many materials problems require the accuracy of atomistic modeling in small regions, such as
the neighborhood of a crack tip. However, these localized defects typically interact through long-
range elastic fields with a much larger region that cannot be computed atomistically. Materials
scientists have proposed many methods to compute solutions to these multiscale problems by cou-
pling atomistic models near a localized defect with continuum models where the deformation is
nearly uniform on the atomistic scale.
During the past several years, a theoretical structure has been given to the description and
formulation of atomistic-to-continuum coupling methods, and corresponding numerical analysis
and benchmark computational experiments have clarified the relation between the various methods
and their sources of error. Our theoretical foundation enabled the development of more accurate
and efficient coupling methods.
Location:
KIP, INF 227, lecture hall 2
Time:
16:00
ECTS-Points:
0
info  Fireside Chat No 2 Dieter Heermann, Peter Bastian ECTS-Points: not yet determined
Abstract, registration & information:
HGS MathComp Fireside Chat No 2: Christoph and Agnes interviewing Prof. Bastian and Prof Heermann on the second funding round of the Graduate School.
Link for more information
Location:
Common room, IWR, 368
Time:
17:00
ECTS-Points:
not yet determined
info  Adaptive inexact Newton methods for discretizations of nonlinear diffusion PDEs Prof. Alexandre Ern Jun., 12, 2012, 16:00 ECTS-Points: 0
Abstract, registration & information:
We consider nonlinear algebraic systems resulting from numerical
discretizations of nonlinear partial differential equations of
diffusion type. To solve these systems, some iterative nonlinear
solver, and, on each step of this solver, some iterative linear
solver are used. We derive adaptive stopping
criteria for both iterative solvers. Both criteria are based on an a
posteriori error estimate which distinguishes the different error
components, namely the discretization error, the linearization error,
and the algebraic error. We stop the iterations whenever the
corresponding error does no longer affect the overall error
significantly. Our estimates also yield a guaranteed upper bound on
the overall error at each step of the nonlinear and linear solvers.
We prove the efficiency and robustness of the estimates with
respect to the size of the nonlinearity owing, in particular, to the
error measure involving the dual norm of the residual. Our
developments are carried at an abstract level, yielding a general
framework. We show how to apply this framework to the
Crouzeix--Raviart nonconforming finite element discretization, Newton
linearization, and conjugate gradient algebraic solution, and we
illustrate on numerical experiments for the $p$-Laplacian the tight
overall error control and important computational savings achieved in
our approach. Finally, we show how to apply our abstract
framework to a broad class of discretization methods. This is joint work
with M. Vohralik (University Pierre et Marie Curie Paris 6).
Link for more information
Location:
IWR, INF 368, Room 432
Time:
16:00
ECTS-Points:
0
info  Automatic Differentiation: Tools & Applications Prof. Paul Hovland Jun. 11, 2012, 14:00 ECTS-Points: 0
Abstract, registration & information:
We explain automatic differentiation, a family of techniques for transforming a computer subprogram that computes a function into a subprogram that computes the derivatives of that function. We discuss the implementation of automatic differentiation tools, focusing on the OpenAD tool architecture. We describe available tools for the C and Fortran language families and techniques for using these tools effectively. We illustrate the techniques with several applications, primarily drawn from the geosciences and computational fluid dynamics. We discuss future applications and the effect these applications have on the research agenda.
Link for more information
Location:
IWR, INF 368, room 432
Time:
14:00
ECTS-Points:
0
info  Mathematical and Computational Modeling in Game Design Jens Schöbel May 15, 2012, 16:00 ECTS-Points: 0
Abstract, registration & information:
Jens Schöbel is developer and group leader at Crytek, one of the most influential computer game companies worldwide. He also teaches game design at the university of applied sciences, Darmstadt.
Link for more information
Location:
OMZ, INF 350, Room 014
Time:
16:00
ECTS-Points:
0
info  Ladyshenskaya-Lecture 2012: Visiting Sets with Random Trajectories Prof. Marta Sanz-Solé May 7, 2012, 17:00 ECTS-Points: 0
Abstract (PDF)
Link for more information
Location:
Mathematical Institute, INF 288, Lecture Hall 1
Time:
17:00
ECTS-Points:
0
info  HGS MathComp Fireside Chat Prof. Günter M. Ziegler May 3, 2012, 17:00 ECTS-Points: 0
Abstract, registration & information:
HGS MathComp launches a new exclusive and regular event organized by and for the students of HGS MathComp: the fireside chats.
You can invite to the fireside chats famous and/or interesting people of your choice to interview them about university career, the working environment in industry or work life balance. On the 5th of May the first chat will be with Prof. Günther Ziegler, FU Berlin, woh is interviewed with Ágnes Horvath and Christoph Zimmer.

Please visit the Fireside website to register:
Link for more information
Location:
IWR, INF 368, Common Room 514
Time:
17:00
ECTS-Points:
0
info  How Virtual Reality led to a paradigm shift: simulators for diagnostics and surgery training in ophthalmology Dr. Clemens Wagner Apr. 24, 2012, 16:00 ECTS-Points: 0
Abstract, registration & information:
VRmagic is the world-leading supplier of virtual reality based simulators for ophthalmological training, both for diagnostic and interventional procedures.
After introducing the medical background and the overall design of our simulators, some of the key technologies will be presented, including real-time approaches for soft-tissue modeling, computer graphics, and virtual reality interfaces. A short discussion of the relevance of simulation in the current educational context will conclude the talk.
Link for more information
Location:
IWR, INF 368, room 432
Time:
16:00
ECTS-Points:
0
info  Multi-imager camera arrays for panoramic, multi-viewpoint, and 3D capture Prof. Harlyn Baker Apr. 24, 2012, 17:00 ECTS-Points: 0
Abstract, registration & information:
Multi-imager camera arrays for panoramic, multi-viewpoint, and 3D capture

Advances in building high-performance camera arrays have opened the opportunity – and challenge – of using these devices for synchronized 3D and multi-viewpoint capture. In this vein, I will discuss a high-bandwidth multi-imager camera system supporting 72 wide-VGA imagers in simultaneous synchronized 30 and 60 Hz operation uncompressed to a single PC. A 6-imager 1080P60 system is in house, preparing for upgrade from PCI-X to PCIe, where multiple dozens are expected to be supported in sustained video delivery. Such a source of massive synchronized video capture presents new opportunities in imaging, including geometry recovery, immersive experiences, entertainment, surveillance, autonomous navigation, and others. A requirement of using camera arrays for quantitative work is that their relative poses be known, so calibration of these sensing elements is a prerequisite of their use. I argue for use of structured arrays – where imagers_ intrinsics and relative positions do not change, and it is feasible to perform this calibration once, before any use. I will present progress in developing a variety of calibration approaches that capitalize on high quality homographies (non metric) and related camera placement constraints in developing globally optimal solutions, including rectifying homographies, fundamental matrices, epipoles, and epipolar rectification parameters for the entire system. The methods build on what we identify as the Rank-One-Perturbation-of-Identity (ROPI) structure of homologies in posing a unified SVD estimator for the parameters. I will summarize the theory, and present both qualitative depictions and quantitative assessments of our results.

Our use of these camera systems include composing panoramic mosaics for videoconferencing and sports capture, linear baseline multiview capture for automultiscopic display, and geometry recovery using Epipolar Plane structurings. I hope to bring a multi-view camera system with me and demonstrate its capabilities on a laptop.

Much of this work has been done in collaboration with Zeyu Li, studying at UC Berkeley under Ruzena Bajcsy.
Link for more information
Location:
Seminarroom H.2.22 at the HCI Speyerer Str. 6
Time:
17:00
ECTS-Points:
0
info  \"End-to-end\" machine learning of image segmentation Dr. Srini Turaga Mar. 8, 2012, 14:15 ECTS-Points: 0
Abstract, registration & information:
Srini Turaga
Gatsby Computational Neuroscience Unit, UCL

\\\"End-to-end\\\" machine learning of image segmentation
(for neural circuit reconstruction)

Supervised machine learning is a powerful tool for creating image segmentation algorithms that are well adapted to our datasets. Such algorithms have three basic components: 1) a parametrized function for producing segmentations from images, 2) an objective function that quantifies the performance of a segmentation algorithm relative to ground truth, and 3) a means of searching the parameter space of the segmentation algorithms for an optimum of the objective function.

In this talk, I will present new work in each of these areas: 1) a segmentation algorithm based on convolutional networks as boundary detectors, 2) the Rand index as a measure of segmentation quality, and 3) the MALIS algorithm for training boundary detectors to optimize the Rand index segmentation measure. Taken together, these three pieces constitute the first system for truly \\\"end-to-end\\\" learning of image segmentation, where all parameters in the algorithm are adjusted to directly minimize segmentation error.
Location:
HCI
Time:
14:15
ECTS-Points:
0