Heidelberg Graduate School HGS MathComp

HGS MathComp Events

WS 12/13SS 13WS 13/14SS 14WS 14/15SS 15WS 15/16SS 16WS 16/17SS 17WS 17/18
Workshops
info  Analyzing postcolonial weblogs with literary and computational methods various July 11th, 2014, 10:00-16:00 ECTS-Points: 1
Abstract, registration & information:
The junior research group “From the Caribbean to North-America and Back” (Transcultural Studies, University of Heidelberg) and the Heidelberg Graduate School of Mathematical and Computational Methods for the Sciences are organizing the interdisciplinary workshop “Under construction. Analyzing postcolonial weblogs with literary and computational methods.” The workshop makes academic approaches to personal weblogs accessible which include the very divergent areas of postcolonial literary studies, computational and engineering sciences. The main object of the event is to mediate a dialogue between the various disciplines. For this purpose, three scientists will give us insights into their research: Prof. Dr. Dagmar Monett Díaz from the Berlin School of Economics and Law, who will talk about the Cuban Blogosphere and its census; Andreas Schieber from the Technical University of Dresden, who will discuss the method of content extraction in weblogs; and Chantal Marquardt from the University of Mannheim, who will elaborate on literary approaches to Francophone North African weblogs.
Abstract (PDF)
Link for more information
Location:
IWR, room 520, INF 368
Time:
10:00
ECTS-Points:
1
info  Common tools for learning and image analysis Prof.Dr. F. Hamprecht May 12-16, 2014 ECTS-Points: 2
Location:
BioQuant Building, INF 267
Time:
9:00
ECTS-Points:
2
info  Introduction to German Academic Culture Dr. Nils Reschke 06 May 2014 13:00 - 17:00; 07 May 2014 09:00 - 17:00 ECTS-Points: 1
Abstract, registration & information:
Every academic culture in general as well as individual disciplinary cultures in particular are characterised by shared basic assumptions and practices that are acquired during the course of study and are handed down and upheld in the practical context at universities and in professional work. It is easy to overlook the fact that basic assumptions and practices of this type are also moulded by cultural differences that not only enrich academic exchange at the international level, but sometimes also impede it. For example, problems can arise at the social level, i.e. with regard to interaction, communication and co-operation, or can be related to the level of academic traditions, i.e. structures of thought and argument.
The goal of the workshop is to make the inherent basic assumptions, rules and expectations of the German academic culture comprehensible to international doctoral candidates and to strengthen their adaptation capabilities. One of the essential objectives of the workshop is to facilitate entry into the foreign culture for the participants in order to reduce stress, misunderstandings and uncertainty and thus to ultimately contribute towards optimal utilisation of personal, time-related and financial resources.

Main focus areas:
- The cultural framework (individual and cultural patterns)
- Underlying structures (comparison of the implicit rules, values and convictions of the German academic system)
- Action-oriented skills 1 (social interaction with colleagues and supervisors)
- Action-oriented skills 2 (academic argumentation)

>Registration required<
Please use the link below to register for the workshop:
Link for more information
Location:
IWR, INF 368, 69120 Heidelberg, Raum 520
Time:
13:00
ECTS-Points:
1
info  FOMOCOG 14 - Formal Models of (Dis)Ordered Cognition various March 24 - 26, 2014, 9:00-18:00 ECTS-Points: 2
Abstract, registration & information:
Computational modeling and simulation of human cognition is an emergent multidisciplinary field of research promising breakthroughs for both basic research and applications. There is already a wide range of notable examples illustrating the successful application of computational modeling in cognition from models of working memory to intelligent tutoring systems. However, many psychiatric and neurological disorders involve characteristic cognitive deficits that still are poorly understood on a process level.
Quantitative cognitive process models promise to contribute towards filling the explanatory gap between models of basic neural mechanisms and high-level cognitive abilities. Mathematical methods and computational tools for process modeling, which have a long success story in other disciplines, e.g. chemical engineering, may help to address the challenges and potential pitfalls arising in this approach. A successful implementation, however, requires a broad range of skills and knowledge.
Therefore, in this challenge workshop, we bring together experts from the different fields of cognitive modeling, cognitive disorders, and process modeling. The aim is to facilitate the exchange about research questions in domains like psychiatry, neuroscience, or cognitive science, which may be addressed by methods of process modeling. We will discuss the available methodological approaches and tools as well as their limitations in order to foster effective future collaborations.
The focus of this workshop will be on higher cognition and its disorders, including process models of the underlying neural activity. A methodological focus will be on effective parameter estimation methods, model validation procedures, model-based optimum experimental design, and the application of these methods to models of cognition.

Target Audience
Researchers interested in quantitative models of cognition, particularly higher cognition and models of dysfunctional cognition. Relevant fields include psychiatry, geriatrics, psychology, cognitive science, neuroscience, mathematics, economics, computer science, statistics, and related fields. The workshop is also open to doctoral and graduate students.

Example topics
- Studies on process-related aspects of disordered
cognition
- Cognitive models of planning and problem-solving
in psychiatric disorders
- Tracing cognitive activity in real-time using model-
supported EEG/fMRT
- Process-interpretation of fMRT connectivity
analyses
- Modeling age-related decline in cognitive abilities
- Modeling of cognitive effects of neurotransmitter
dysbalances and psychopharmacological
interventions
- Axiomatic analyses of modeling frameworks
- Tractable mathematical formulations of cognitive
models
- Parameter estimation
- Model discrimination and validation
- Model-based optimum experimental design
Link for more information
Location:
Internationales Wissenschaftsforum Heidelberg (IWH), Hauptstraße 242, 69117 Heidelberg
Time:
9:00
ECTS-Points:
2
Events
info  HGS MathComp Lecture Serie Majority Spanning Trees, Cotrees and their Applications Prof. M. Kaykobad Sept 23, 2014 ECTS-Points: not yet determined
Abstract, registration & information:
Abstract:
A new class of spanning trees, called Majority Spanning trees, and Majority Cotrees have been defined and their existence in digraphs, with non-negative weights
on edges, have been established. The applications of Majority Spanning Trees to Minimum Connection Time Problem, Optimal Ranking of a Round Robin Tour- nament and settling debts have been shown.

Hinweis für Teilnehmer:
For this lunch-time event we will provide desserts for every attendee. We cordially invite all members of HGS MathComp and IWR to join us!
Abstract (PDF)
Location:
IWR, INF 368, Raum 532
Time:
13:15
ECTS-Points:
not yet determined
info  Developments towards 4D+ imaging for turbulent combustion research Prof. Dr. Volker Sick Sep. 17, 2014, 2 p.m. ECTS-Points: not yet determined
Abstract, registration & information:
Advances in combustion science and technology depend ever more critically on our ability to formulate descriptions that enable predictive simulations for fundamental insights and for the design of technical combustion systems. Experimentally discovering and characterizing new insights into the physics and chemistry of combustion is foundational in that context. Over the past decade, advances in instrumentation have enabled measurements to image mixing, ignition, and flame evolution at relevant real-time scales. New laser sources, digital cameras, and image processing capabilities have lead to a rapid growth in capability and widespread use of high-speed imaging diagnostics in combustion research. Now, the extensions of these capabilities are being pursued to enable experiments that capture the 3D nature of combustion in single-shot measurements.


This presentation describes examples of 2D and 3D high-speed imaging techniques and their application to study spark-ignited direct-injected internal combustion engines to understand the causes of combustion instabilities that are inherent to these engines.
Location:
IWR, INF 368, R 248
Time:
14:00
ECTS-Points:
not yet determined
info  Some methods for approximate dual control based on MPC Tor Aksel Heirung Aug 07, 2014 ECTS-Points: not yet determined
Abstract, registration & information:
Maintaining a good model of a controlled plant is an important challenge
in the process industries, model quality being one determining factor
for the performance of a model predictive controller (MPC). Feldbaum was
the first to recognize that an optimal controller for a system with
unknown parameters has two conflicting tasks: directing the output
toward a reference, and exciting the system for learning purposes so
that better control decisions can be made in the future. A dual
controller is optimal in the sense that it finds the best trade-off or
balance between control and excitation.

In this talk we will look at three variations of an MPC based approach
to the problem of controlling a system with unknown model parameters
while simultaneously exciting the system so that the parameter estimates
can be improved and their error variances reduced. Excitation is
explicitly included in the cost functions and balanced against standard
control objectives.

All three algorithms can be implemented with minor modifications to an
existing MPC framework. We look numerical results for each of the three
approaches and compare some advantages and disadvantages. The results
show that parameter identification can be greatly enhanced with only a
small effect on the system output by allowing the controllers to
slightly increase the system excitation in a smart way, and that this
can be achieved without requiring persistent excitation.

The last part of the presentation contains some promising preliminary
experimental results.
Location:
Im Neuenheimer Feld 368, Room 432
Time:
14:15
ECTS-Points:
not yet determined
info  Colloquium: Scientific Computing for the Humanities - Applications of Part-Structured Models to Handwritten Document Analysis - Prof. Nicholas R. Howe July 30, 2014, 14:15h ECTS-Points: not yet determined
Abstract, registration & information:
Part-structured models were first developed for the task of photographic object recognition, but recently they have been used to solve problems in document analysis. The models allow incorporation of spatial constraints between component parts using springlike potentials, and inference on them can be efficiently performed through a form of dynamic programming. This talk will describe the use of one particular form of part-structured model, the inkball model, and examine its application to word spotting, character detection, word recognition, and writing style comparison.
Abstract (PDF)
Location:
INF 368, Room 532
Time:
14:15
ECTS-Points:
not yet determined
info  PDE Soft 2014 various July 14 - 16, 2014 ECTS-Points: not yet determined
Abstract, registration & information:
Simulation software for complex phenomena based on models involving partial differential equations (PDE) has become an important topic in modern research from mathematics and scientific computing providing methods and algorithms to application fields utilizing codes and defining requirements on their technical abilities. Powerful, but also complex mathematical algorithms and advanced hardware architectures have widened the span of practically computable problems considerably. But this power does not come for free and is typically related to complex implementations which have to be developed over many years. The development of powerful, academic, multi-purpose libraries for PDE simulation began about 1990. Nowadays, there are several widespread codes which are well developed and well maintained. These codeas have different characteristics, making them better suited for different problems.

PDESoft conferences provide a discussion venue for developers and users of such libraries as well as researchers who study implementation of computer algorithms for PDE. They serve as a focus point, where the state-of-the-art implementation of state-of-the-art algorithms is discussed. They give developers a chance to share ideas with developers of other packages and users. And users of such sofware have an opportunity to learn about the development principles of software and contribute their knowledge from the point of view of application.

The PDESoft conferences started in 2012 at Universität Münster. After the conference, a considerable number of participants gave positive feedback and it was agreed, that a series of conferences on the topic of PDE-Software was needed. The conference this year is the second in this series.

The 2014 conference will be hosted jointly by the Heidelberg Institute for Theoretical Studies (HITS) and Heidelberg University_s Interdisciplinary Center for Scientific Computing (IWR). The presentations and discussions will take place at the Studio Villa Bosch in Heidelberg, Germany.

The conference is followed by coding days (July 17/18) at the IWR. Two days of joint coding. We will set up infrastructure (power and ethernet) in a single room such that participants can discuss while writing code on their laptops and other devices.
Link for more information
Location:
Schloss-Wolfsbrunnenweg 33 , 69118 Heidelberg
Time:
9:00
ECTS-Points:
not yet determined
info  Light Fields - New Imaging Modalities Dr. Sven Wanner July 9th, 2014, 17:15 ECTS-Points: 0
Abstract (PDF)
Location:
IWR, lecture hall 432, INF 368
Time:
17:15
ECTS-Points:
0
info  HGS MathComp Summer Party 2014 HGS MathComp July 2, 2014, 18:30h ECTS-Points: 0
Abstract, registration & information:
/ Description:

We kindly invite all members, students and staff of the HGS MathComp to join us at our Summer Party 2014.

As usual, in accordance with university guidelines, we have to charge € 10 per person to cover expenses and of course children are free.

Please make sure to register online for the event. (see link below)
Abstract (PDF)
Link for more information
Location:
KIP, INF 277
Time:
18:30
ECTS-Points:
0
info  Elliptic curves and multiplicative integrals over non-archimedean fields Prof. Gebhard Böckle June 25th, 2014, 17:15 ECTS-Points: 0
Abstract (PDF)
Location:
IWR, lecture hall 432, INF 368
Time:
17:15
ECTS-Points:
0
info  HGS MathComp Romberg Inauguration Lecture: Simulating Our Multiscale World - Multilevel Simulation Under Uncertainty Prof. Robert Scheichl June 16, 2014, 14:15h ECTS-Points: 0
Abstract, registration & information:
Computer simulation is everywhere in our daily life, be it the designing of novel materials or weather and climate prediction. Simulation is the new heart of science and engineering. It has largely replaced experimentation and prototyping and will play an increasing role in the future. It also has made inroads into new areas of growth, such as the social sciences, medicine and biology.

What all these complicated processes have in common is the vast array of spatial and temporal scales that they span. Brute force computation is impossible even on the biggest supercomputer, and so mathematics plays a central role to reduce the behaviour to simpler, computable models that still retain predictive power on the scales of interest. By looking at various examples, drawn from my research, I will highlight the progress and the challenges for modern scientific computing in simulating our multiscale world, in particular calling attention to the increasingly important field of uncertainty quantification.
Abstract (PDF)
Location:
BZH, INF 328, Room SR25
Time:
14:15
ECTS-Points:
0
info  Flexible Numerical Methods for Porous Media Flows Prof. Béatrice Rivière June 04th, 2014, 17:15 ECTS-Points: 0
Abstract (PDF)
Location:
IWR, lecture hall 432, INF 368
Time:
17:15
ECTS-Points:
0
info  Numerical Simulation of Interfacial Transport Processes using OpenFOAM® Dr. Holger Marschall May 28, 2014, 17:15 ECTS-Points: 0
Abstract (PDF)
Location:
IWR, lecture hall 432, INF 368
Time:
17:15
ECTS-Points:
0
info  Image as Document and Monument : Some Reasons for the 3D Reconstruction of the "Dance of Shiva" at Prasat Thom in Koh Ker (Cambodia) Dr. Eric Bourdonneau May 21st, 2014, 14:00 ECTS-Points: 0
Abstract, registration & information:
Historians and archaeologists don_t look any more at images according to the postulates of the traditional iconography. They highlight the need to take image as an indissociable whole and not to separate it from the materiality of its medium: images have to be considered in their physicality and it is as such – that is, as physical objects being acted and acting in specifics locations –that their functionalities could be better understood. In addition to remind some of the well - known reasons
to work on 3D reconstructions of archaeological heritage, the present paper will illustrate how such reconstructions can contribute to better understanding of the \\\"agency\\\" of images, taking the example of one the most extraordinary sculpted group of Ancient Cambodia: the five heavily damaged statues of the dance of Śiva at Prasathom in Koh Ker.
Location:
IWR, lecture hall 432, INF 368
Time:
14:00
ECTS-Points:
0
info  Image as Document and Monument : Some Reasons for the 3D Reconstruction of the "Dance of Shiva" at Prasat Thom in Koh Ker (Cambodia) Dr. Eric Bourdonneau May 21st, 2014, 14:00 ECTS-Points: 0
Abstract, registration & information:
Historians and archaeologists don_t look any more at images according to the postulates of the traditional iconography. They highlight the need to take image as an indissociable whole and not to separate it from the materiality of its medium: images have to be considered in their physicality and it is as such – that is, as physical objects being acted and acting in specifics locations –that their functionalities could be better understood. In addition to remind some of the well - known reasons
to work on 3D reconstructions of archaeological heritage, the present paper will illustrate how such reconstructions can contribute to better understanding of the \"agency\" of images, taking the example of one the most extraordinary sculpted group of Ancient Cambodia: the five heavily damaged statues of the dance of Śiva at Prasathom in Koh Ker.
Abstract (PDF)
Location:
IWR, lecture hall 432, INF 368
Time:
14:00
ECTS-Points:
0
info  HLR 2014 French-German-Japanese Conference in Humanoid and Legged Robots various May 12 - 14, 2014 ECTS-Points: not yet determined
Abstract, registration & information:
Scope of the conference
The construction of humanoid and bipedal robots based on humans and legged animals, is a complex, interdisciplinary and rapidly evolving research field. There are diverse scientific challenges in designing a robot that can walk, run, jump, and move in a robust manner similar to its biological counterpart. Technical applications of such robots are expected in the near future in fields ranging from service robotics (households, public or industrial environments, hazardous sites) to medical robotics (neuro-prosthetics, exo-skeletons etc).
This conference aims to bring together leading researchers from France, Germany and Japan to hold technical talks and discussions on the topics related to Humanoid and Legged Robots.

List of the conference topics:
• Locomotion of humanoid robots on varying terrains
• Manipulation and grasping for humanoid robots
• Cognitive skills for humanoid robots
• Walking models (biological & human) for robots
• Stability analysis and Robustness of robot motion
• Efficient control algorithms for robot motions
• Compliance for walking robots and humanoid robots
• Modeling in robotics - model reduction/simplification
• Simulation- and optimization methods for walking and humanoid robots
• New technologies for actuation and sensor-systems

HLR 2014 is the follow-up of two successful French-German HLR Conferences in Karlsruhe in 2006 and in Paris in 2011

HLR 2014 is divided in two parts:
• A public inaugural session on May 12 taking place at the Alte Aula
• A workshop on May 13 & 14 for invited participants, taking place at IWH
Link for more information
Location:
Alte Aula, Grabengasse 1, 69117 Heidelberg / Internationales Wissenschaftsforum Heidelberg (IWH), Hauptstraße 242, 69117 Heidelberg
Time:
9:00
ECTS-Points:
not yet determined
info  The PLUTO Code for Astrophysical Fluid Dynamics Application and Challenges Prof. Andrea Mignone May 05, 2014, 17:15 ECTS-Points: 0
Abstract (PDF)
Location:
IWR, lecture hall 432, INF 368
Time:
17:15
ECTS-Points:
0
info  Astrophysical GPU Supercomputing, Galactic Nuclei and Black Holes Prof. Rainer Spurzem April 30,2014, 17:15 ECTS-Points: 0
Abstract (PDF)
Location:
IWR, Lecture hall 432, at 17:15
Time:
17:15
ECTS-Points:
0
info  Multilevel-Verfahren für die Optimierung bei partiellen Differentialgleichungen basierend auf Adaptivität und reduzierten Modellen Stefan Ulbrich 24 April 2014 ECTS-Points: not yet determined
Abstract, registration & information:
Wir betrachten Optimierungsprobleme, in denen partielle
Differentialgleichungen als Nebenbedingungen auftreten. In den letzten
Jahren wurden erhebliche Fortschritte bei der Entwicklung von
Multilevel-Optimierungsverfahren gemacht, die adaptive
Diskretisierungstechniken, reduzierte Modelle und a
posteriori-Fehlerschätzer in effizienter Weise verbinden. Diese
Verfahren eröffnen das Potential, Optimierungsiterationen auf Basis
relativ billiger Simulationsmodelle zu berechnen und das
Optimierungsproblemen im Aufwand weniger Simulationen der
zugerundeliegenden partiellen Differentialgleichung zu lösen.
Wir diskutieren einen Multilevel-Ansatz, der eine Hierarchie adaptiver
Diskretisierungen während der Optimierungsiteration auf Basis
adaptiver FE-Diskretisierungen und reduzierter Modelle wie POD
erzeugt. Die adaptive Verfeinerungsstrategie beruht auf a
posteriori-Fehlerschätzern für die zugrundeliegende Zustandsgleichung,
adjungierte Gleichung und das Stationaritätsmaß. Der resultierende
Algorithmus kann bestehende adaptive PDE-Löser und Fehlerschätzer
modular einsetzen. Neben der Behandlung von Steuerungsnebenbedingungen
gehen wir auch auf die Behandlung von Zustandsschranken ein. Wir
demonstrieren die Effizienz des Ansatzes
anhand von numerischen Ergebnissen.
Location:
Im Neuenheimer Feld 368, IWR, Room 248
Time:
14:00
ECTS-Points:
not yet determined
info  Utilizing light for repair of light-induced DNA damages: the clever mode of action of DNA photolyases Dr. Shirin Faraji April 23rd, 2014, 17:15 ECTS-Points: 0
Abstract (PDF)
Location:
IWR, lecture hall 432, INF 368
Time:
17:15
ECTS-Points:
0
info  Integration of Engineering Modeling and Optimal Experiment Design for Molecular Mechanism of Inflammation Prof. Dr. Jernan Juang 11 April 2014, 14:00 ECTS-Points: not yet determined
Location:
Im Neuenheimer Feld 368, Room 432
Time:
14:00
ECTS-Points:
not yet determined
info  Wissenschaft mit AHA-Effekt, Die Pützmunter-Show mit Experimenten zum Staunen & Schmunzeln Jean Pütz 11 April 2014, 17:00 ECTS-Points: not yet determined
Link for more information Location:
DKFZ, Kommunikationszentrum, Im Neuenheimer Feld 280, 69120 Heidelberg
Time:
17:00
ECTS-Points:
not yet determined
info  New techniques for solving large sparse linear system of equations in parallel Prof. Murat Manguoglu 03 April 2014; 14:15 ECTS-Points: not yet determined
Abstract, registration & information:
Parts of this talk is a joint work with Ahmed H. Sameh (Purdue University), Faisal Saied (NYU-AD), Georgios Kollias (IBM Thomas J. Watson Research Center), Ercan Bolukbasi (METU) and Omer Tari
(METU).

Solution of sparse linear systems in parallel computing platforms
requires two main steps which are critical: (1) Reordering the sparse
matrix and (2) direct or iterative algorithms for solving the
reordered system of equations. In this talk we will talk about novel
algorithms that improve the parallel scalability in both steps.

In the first part of this talk, we will present a new multithreaded
and recursive variation of the DS factorization based parallel direct
sparse solver. We show the improvement compared to the sparse LU
factorization based multithreaded Pardiso direct solver on a shared
memory architecture.

In the second part, we will present recent results on obtaining the
Fiedler vector and the permutation induced by the Fiedler vector
effectively on a parallel computing platform. We will show a
significant parallel improvement using our algorithm compared to a
highly effective sequential counterpart in the Harwell Subroutine
Library. We will also apply this permutation to extract a banded
preconditioner and solve the linear systems of equations in parallel
using PSPIKE scheme.
If time permits, we will also present a new reordering scheme based on
the largest eigenvector of the graph Laplacian. From any given sparse
matrix, the new reordering scheme can create a 2x2 block form with
favorable properties.
Location:
INF 368, Room 248
Time:
14:15
ECTS-Points:
not yet determined
info  A Compressed PCA Subspace Method for Anomaly Detection in High-Dimensional Data Eric Kolaczyk March 13, 2014 ECTS-Points: not yet determined
Abstract, registration & information:
Random projection is widely used as a method of dimension reduction. In recent years, its combination with standard techniques of regression and classification has been explored. In this talk we present a method for its use in anomaly detection in high-dimensional settings, in conjunction with principal component analysis (PCA) and corresponding subspace detection methods. We assume a so-called spiked covariance model for the underlying data generation process and a Gaussian random projection. We adopt a hypothesis testing perspective of the anomaly detection problem, with the test statistic defined to be the magnitude of the residuals of a PCA analysis. Under the null hypothesis of no anomaly, we characterize the relative accuracy with which the mean and variance of the test statistic from compressed data approximate those of the corresponding test statistic from uncompressed data. Furthermore, under a suitable alternative hypothesis, we provide expressions that allow for a comparison of statistical power for detection. Finally, whereas these results correspond to the ideal setting in which the data covariance is known, we show that it is possible to obtain the same order of accuracy when the covariance of the compressed measurements is estimated using a sample covariance, as long as the number of measurements is of the same order of magnitude as the reduced dimensionality. We illustrate the practical impact of our results in the context of predicting volume anomalies in Internet traffic data.
Time:
9:00
ECTS-Points:
not yet determined