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Dr. Jens Saak

News Archive

MESS

Software: M.E.S.S. now available also in C, Python and via MEX for Matlab.


July 13th, 2018
The M-M.E.S.S. toolbox for Matlab is getting reinforcements. In version 1.0.0 today the C-based implementation with bindings for python and Matlab (via MEX) has been released. As of today, the C version does not support solvers for differential matrix equations, but comes with a couple of features, that are still missing in M-M.E.S.S..

Events: GAMM Workshop on Applied and Numerical Linear Algebra


September 7th, 2017
This years Meeting of the GAMM activity group on applied and numerical linear algebra on September 07 and 08 in Cologne features the topic HPC. Martin Köhler and Jens Saak represented the work of the CSC group in a topical session on hybrid CPU-GPU implementations of algorithms from linear algebra.
castle

Events: PACO 2017


July 5th, 2017
The second Workshop on PowerAware Computing is taking place at the Max Planck conference center at Ringberg castle at the Tegernsee lake. The topics have been slightly broadened as compared to the previous instance in 2015. We have found a number of well established keynote and invited speakers.
RRR

Paper: Best practices for replicability, reproducibility and reusability of computer-based experiments exemplified by model reduction software


September 28th, 2016
The final version of the manuscript has now been published open-access in AIMS Mathematics.

Events: Wissenschaft im Rathaus


September 26th, 2016
Jens Saak and Martin Köhler will give a talk „Formeln für die Energiewende: Wie kann mit Mathematik Energie gespart werden?" within the series "Wissenschaft im Rathaus". Beginning: 7 pm. Venue: Altes Rathaus, Magdeburg.

Events: Workshop of GAMM activity group "Applied and Numerical Linear Algebra"


September 15th, 2016
The 16th GAMM Workshop Applied and Numerical Linear Algebra took place at the Hamburg UT. Peter Benner, Jens Saak, Nicodemus Banagaaya, Patrick Kürschner and Martin Stoll from the CSC / NDS group attended. Martin Stoll, Jens Saak and Patrick Kürschner presented recent result in contributed talks.
7ECM

Events: 7-th European Congress of Mathematics (TU Berlin)


July 18th, 2016
The CSC group is presenting talks by Pawan Goyal, Jan Heiland and Alexander Zuyev. Moreover, Jens Saak organizes a Minisymposium on Matrix Equations: Solvers and Applications in cooperation with Hermann Mena.
ILAS2016 logo

Events: 20th Conference of the International Linear Algebra Society (ILAS)


July 11th, 2016
CSC and NDS contributed several talks (Peter Benner, Jens Saak, Patrick Kürschner, Akwum Onwunta, Martin Soll, Christian Himpe, Xin Liang) to minisymposia at this year's ILAS Conference with 440 participants at KU Leuven. Furthermore, Peter Benner co-organized the invited minisymposium "Matrix Equations" jointly with Beatrice Meini (U Pisa).

Preprint: Best Practices for Replicability, Reproducibility and Reusability of Computer-Based Experiments Exemplified by Model Reduction Software


July 5th, 2016
Reproducible and replicable numerical experiments are the basic requirement for the comparability of different methods on common benchmark examples. This article by J.Fehr, J. Heiland, Ch. Himpe and J. Saak introduces the general topic, gives guidelines for good practice in the execution of such experiments in the area of model order reduction and explains basic requirements on the underlying software for its reusability in similar use cases.
M-M.E.S.S.

CSC News: M-M.E.S.S 1.0.1 released


April 28th, 2016
The M.E.S.S. developers team has released a small bugfix version of the recently published Version 1.0.
M-M.E.S.S.

CSC News: M-M.E.S.S 1.0 released


April 12th, 2016
The M.E.S.S. developers team has released version 1.0 of the LyaPack successor after a development time of alomst 8 years.

Preprint: Balanced truncation model reduction for linear time-varying systems


October 12th, 2015
Norman Lang, Jens Saak and Tatjana Stykel present a practically realizable implementation of the balanced truncation method for linear time-varying systems in terms of a differential Lyapunov equation solver based on a symmetric indefinite factorization of the solution.

Preprint: A low-rank quadratic ADI algorithm for algebraic Riccati equations


October 2nd, 2015
Peter Benner, Zvonimir, Bujanovic, Patrick Kürschner and Jens Saak present a quadratic version of the ADI iteration for directly handling large-scale algebraic Riccati equations.

Events: Matrix Equations and Tensor Techniques 2015


September 21st, 2015
The fifth workshop on matrix equations and tensor techniques is held in Bologna, Italy from September 21-22, 2015. It is coorganized by the CSC group. Sergey Dolgov is a keynote speaker and Jens Saak, Heiko Weichelt, Patrick Kürschner will give contributed talks.
Prod. Eng. Res. Dev.

New Paper: Optimal control and its application to inverse problems.


July 17th, 2015
The article Towards the identification of heat induction in chip removing processes via an optimal control approach has been published in Volume 9, Issue 3 of the journal Production Engineering Research and Development. It covers a numerical method based on an optimal control ansatz for the solution of inverse heat conduction problems.

Preprint: Frequency-Limited Balanced Truncation with Low-Rank Approximations


July 8th, 2015
Peter Benner, Patrick Kürschner und Jens Saak present in this work computational approaches for an numerically efficient execution of frequency-limited balanced trunction for large-scale systems.
?

Events: Workshop on Power-Aware Computing (PACO2015)


July 4th, 2015
Inside the project EHFARS the Scientific Computing Team is holding their initiation workshop entitled "Power-Aware Computing PACO2015" at the MPI. The workshop aims at bringing German experts in the field and our project partners from Uruguay together in a 3 day event from July 6 to 08.

Preprint: Inexact Low-Rank Newton-ADI Method for Large-Scale Algebraic Riccati Equations


May 28th, 2015
Peter Benner, Matthias Heinkenschloss, Jens Saak, and Heiko Weichelt combine in this preprint various methods to effciently solve large-scale algebraic Riccati equations.
SIAM J. Sci. Comput.

New Paper: Riccati-based Boundary Feedback Stabilization of Incompressible Navier-Stokes Flows


April 27th, 2015
The recently published article Riccati-based Boundary Feedback Stabilization of Incompressible Navier-Stokes Flows appeared in the 2nd issue of the 37th SISC volume on pages A832-A858. The article describes efficient numerical methods to compute a Riccati based feedback stabilization via boundary control input for incompressible Navier-Stokes equations.
Linear Algebra Appl.

New Paper: Efficient solvers for matrix differential equations


April 26th, 2015
The article On the benefits of the LDLT factorization for large-scale differential matrix equation solvers will appear in volume 480 of the Elsevier journal Linear Algebra and its Applications. It covers efficient numerical methods for the solution of differential matrix equations.
Prod. Eng. Res. Dev.

New Paper: Optimal control and its application to inverse problems.


April 4th, 2015
The article Towards the identification of heat induction in chip removing processes via an optimal control approach will appear in the journal Production Engineering Research and Development. It covers a numerical method based on an optimal control ansatz for the solution of inverse heat conduction problems.

CSC News: New Funding


January 1st, 2015
The power-aware HPC task force of the CSC group is supported by the federal ministry for science and education for a period of two years. With the help of the strategies of the German government for the internationalization of science and research we receive an amount of almost 40 000€ for travel and workshop expenses.

Preprint: Low-Rank Newton-ADI methods for Large Nonsymmetric Algebraic Riccati Equations


November 20th, 2014
Peter Benner, Patrick Kürschner and Jens Saak discuss a numerical algorithm for solving large-scale, nonsymmetric algebraic Ricatti equations, which combines a Newton's method with the low-rank ADI iteration for Sylvester equations.

Preprint: Balancing based model reduction for structured index-2 unstable descriptor systems with application to flow control


November 12th, 2014
Peter Benner, Jens Saak and M. Monir Uddin combine an approach for Balanced truncation of unstable systems with the efficient treatment of Stokes-like index-2 DAE structures and the latest techniques for implementing the low-rank ADI as well as choosing appropriate ADI shifts.

Preprint: On GPU Acceleration of Common Solvers for (Quasi-) Triangular Generalized Lyapunov Equations


October 15th, 2014
Martin Köhler und Jens Saak have extended the already optimized methods for the solution of matrix Lyapunov equations with (quasi) triangular coefficient matrices to support accelerator devices. Thus, they have shown the main problems of using an accelerator device in the Bartels-Stewart algorithm and presented mathematical solutions for these problems.
DAAD

CSC News: Workshop within DAAD project Optimal Damping of Vibrating Systems in Osijek (Croatia)


October 7th, 2014
Peter Benner, Jonas Denißen, Patrick Kürschner and Jens Saak attend the workshop within the DAAD project Optimal Damping of Vibrating Systems in Osijek (Croatia). The workshop is supported by the German Academic Exchange Service (DAAD), Zeidler-Forschungs-Stiftung and the department of mathematics, J. J. Strossmayer University of Osijek.
GAMM DynCont

Events: Workshop and meeting of GAMM activity group "Dynamics and Control"


September 24th, 2014
This years second meeting of the GAMM activity group on "Dynamics and Control" will take place together with the GMA activity groups 1.30 and 1.40 as usual on a bi-anual basis. The meeting is scheduled September 22 to 26 at the Momentum hotel Anif near Salzburg. The talks of the GAMM activity group will take place on Wednesday 24th and contain contributions by Peter Benner and Norman Lang. Also Jens Saak gives a talk in the GMA activity group 1.30 on Friday September 26.
SLICOT

Preprint: On BLAS Level-3 Implementations of Common Solvers for (Quasi-) Triangular Generalized Lyapunov Equations


September 23rd, 2014
Martin Köhler und Jens Saak have extended existing methods for the solution of matrix Lyapunov equations with (quasi) triangular coefficient matrices from Blas level-2 to level-3. Thus, they have optimized the exploitation of modern computer architectures and achieved acceleration of the execution by notable factors.

CSC News: New article: Model Order Reduction for Systems with Moving Loads


August 5th, 2014
The article "Model Order Reduction for Systems with Moving Loads" by Peter Benner, Norman Lang and Jens Saak has been published at June 28 2014, in De Gruyter Oldenbourg: at-Automatisierungstechnik: volume 62 (7).

Preprint: On the benefits of the LDLT factorization for large-scale differential matrix equation solvers


July 30th, 2014
Norman Lang, Hermann Mena, and Jens Saak present an LDLT based version of the standard low-rank Lyapunov solvers based on ADI or Krylov subspace methods. The method allows us to avoid complex arithmetic for the solution of matrix differential equations via higher order time integration methods, as well as the a priori reduction of the number of columns in the right hand side of the arising algebraic Lyapunov equations inside of the time integration loop.

Events: Joint GAMM ANLA and ALAMA Meeting 2014


July 13th, 2014
Patrick Kürschner and Jens Saak presented their respective latest results on the efficient computation of frequency limited Gramain matrices and inexact Newton based solution of the LQR problem for linearized flow problems at the joint meeting of the GAMM ANLA and its spanish counterpart ALAMA that took place in Barcelona July 14-16. Peter Benner acted as part of the organizing commitee.
PMAA 2014

Events: Participation at the PMAA 2014 in Lugano


July 2nd, 2014
Martin Köhler and Jens Saak participate at the 8th International Workshop on Parallel Matrix Algorithms and Applications (PMAA14) from 2nd to 4th July 2014 in Lugano. Martin Köhler presented a new efficient implementation of the Bartels-Stewart Algorithm for the solution of dense generalized Lyapunov equations. Our software library FlexiBLAS was presented by Jens Saak.
GAMM

Events: 85th Annual Meeting of the International Association of Applied Mathematics and Mechanics


March 10th, 2014
The 85th Annual Meeting of the International Association of Applied Mathematics and Mechanics is taking place in Erlangen, Germany. Patrick Kürschner, Jens Saak, Jonas Denißen, Norman Lang, Akwum Onwunta, Björn Baran, Ulrike Baur, Zvonimir Bujanovic, Jan Heiland, Martin Köhler, Matthias Voigt, and Sara Grundel will give talks in the contributed sections.
LAWN

Preprint: FlexiBLAS: A flexible BLAS library with runtime exchangeable backends


January 10th, 2014
Martin Köhler and Jens Saak publish LAPACK Working Note #284 on a plugin based BLAS implementation that allows to switch the BLAS library used by a program at runtime without the need for recompilation or the requirement for any super user privileges.
MESS

CSC News: Defense of Bachelor thesis by Björn Baran


December 10th, 2013
On December 10-th 2013 Björn Baran will defend his Bachelor thesis by the topic "Numerisches Lösen großer dünnbesetzter Matrixgleichungen in Python". The colloquium will be held in English language. It starts 13:30 in the Seminar room Prigogine at the MPI.

Preprint: Interfacing C-M.E.S.S. with Python


November 19th, 2013
The M.E.S.S. software suite is the successor of the obsolete LyaPack MATLAB® toolbox for solving large scale matrix equations and related problems. The software suite consists of a new MATLAB toolbox and a separate C library C-M.E.S.S. which works independent from MATLAB. Due to the fact that many scientists use Python with NumPy and SciPy for their everyday work we want to provide the key algorithm of M.E.S.S. for them, too. In this report Björn Baran, Martin Köhler, Nitin Prasad and Jens Saak describe how to build an interface between Python and C-M.E.S.S. on top of the NumPy/SciPy-Python libraries.
TR96

Events: 3rd colloquium of SFB/TR-96 on 10/29-30/13 in Aachen


October 29th, 2013
The third colloquium of the SFB/TR-96 takes place in Aachen from 29th to 30th of october. For further informations have a look at the official webpage of the SFB/TR-96

New Preprint: Peter Benner, Patrick Kürschner, Jens Saak: Self-Generating and Efficient Shift Parameters in ADI Methods for Large Lyapunov and Sylvester Equations


October 9th, 2013
The authors present novel shift strategies for low-rank ADI methods for the numerical solution of large-scale Lyapunov and Sylvester equations. In the proposed approaches shift parameters are computed automatically during the ADI iteration. Numerical test show that these new shifts outperform existing strategies in several cases, especially for problems with complex spectra.
GMA_FA_1.30

Events: GMA activity group 1.30


September 18th, 2013
Norman Lang, Jens Saak und Matthias Voigt present parts of their research results at the GMA activity group 1.30 from September 18 to September 20 at the Momentum hotel in Anif (Salzburg).
GAMM

Events: GAMM Workshop Applied and Numerical Linear Algebra


September 9th, 2013
The GAMM Workshop Applied and Numerical Linear Algebra will take place at the Bergische Universität Wuppertal from 09/09 - 09/10/2013. Peter Benner, Matthias Voigt, Jens Saak, Jessica Bosch und Patrick Kürschner are participants and in part give contributed talks.
MPI-MD/13-07

Preprint: Numerical Solution of Large and Sparse Continuous Time Algebraic Matrix Riccati and Lyapunov Equations: A State of the Art Survey


June 24th, 2013
Efficient numerical algorithms for the solution of large and sparse matrix Riccati and Lyapunov equations based on the low rank alternating directions implicit (ADI) iteration have become available around the year 2000. Over the decade that passed since then, additional methods based on extended and rational Krylov subspace projection have entered the field and proved to be competitive alternatives. In this survey we sketch both types of methods and discuss their advantages and drawbacks. We focus on the continuous time case here, but corresponding results for discrete time problems can for most results be found in the available literature and will be referred to throughout the paper.
Björn Baran

CSC News: New student assistant and Bachelor candidate


April 1st, 2013
On April 1st Björn Baran started as a new student research assistant in the M.E.S.S. project. His main duties will be the implementation of recent algorithmic advances in the Matlab version. In his Bachelor thesis he will then port these new codes to Python and compare this implementation with simple python interface functions to the C version of M.E.S.S.
GAMM

Events: 84th Annual Meeting of the International Association of Applied Mathematics and Mechanics


March 15th, 2013
The 84th Annual Meeting of the International Association of Applied Mathematics and Mechanics is taking place in Novi Sad, Serbia. Peter Benner, Tobias Breiten, Patrick Kürschner, Jessica Bosch, Jens Saak, Martin Redmann, Jonas Denißen and Norman Lang will give talks in the contributed sections.
SPP1253

Events: SPP1253 Final Meeting


February 24th, 2013
The final meeting of the DFG SPP1253 Optimization with Partial Differential Equations was held at Banz monastery. Peter Benner, Heiko Weichelt and Jens Saak participated and presented the latest results of the local project Optimal Control-Based Feedback Stabilization of Multi-Field Flow Problems there. (Talk ca. 16MB as PDF)

CSC News: Feedback stabilization of von Kármán vortex street


February 12th, 2013
First forward simulation with integrated feedback stabilization available.

CSC News: Elgersburg Workshop, 11 - 14 February 2013


February 11th, 2013
On this years Elgersburg Workshop the Computational Methods in Systems and Control Theory is presenting three talks by P. Benner, M. Redmann and M.Voigt. Additionally, U. Baur, T. Breiten, J. Denißen and J. Saak are participating.

CSC News: New intern


February 5th, 2013
Sandra Kutz (student of applied mathematics at OvGU) is investigating the capabilities and limitations of Matlabs GPU computing toolbox in the context of solvers for large and sparse matrix equations during a 5 week internship.
TR96

Events: Meeting of the working group parameterization and simulation of SFB/TR-96 on 01/31-02/01/13 in Dresden


January 31st, 2013
A meeting of the working group parameterization and simulation of the SFB/TR-96 takes place in Dresden from 31st of January to 1st of February. For further informations have a look at the official webpage of the SFB/TR-96

Thesis Topic: Bachelor Thesis


December 18th, 2012
Model order recuction using balanced truncation for differential algebraic second order systems in M.E.S.S.
Contact: Jens Saak

Thesis Topic: Bachelor Thesis


December 18th, 2012
Numerical Solution of large and sparse matrix equations on distributed memory parallel machines
Contact: Jens Saak

Thesis Topic: Bachelor Thesis


December 18th, 2012
Approximate solution of the Linear systems of equations in the ADI Method for large and sparse matrix equations
Contact: Jens Saak

Thesis Topic: Diplom/Master Thesis


December 18th, 2012
A CG-Method with ADI preconditioning for the solution of large sparse Lyapunov equations with symmetric coefficient matrices
Contact: Jens Saak

Thesis Topic: Diplom/Master Thesis


December 18th, 2012
Step size control for the numerical solution of large and sparse matrix differential Riccati equations
Contact: Jens Saak

Thesis Topic: Bachelor Thesis


December 18th, 2012
 
Numerical solution of large sparse Matrix equations on CUDA GPUs
Contact: Jens Saak

Thesis Topic: Bachelor Thesis


December 18th, 2012
 
Numerical solution of large and sparse matrix equations in Python
Contact: Jens Saak
Prod. Eng. Res. Dev.

New Paper: Efficient Model Order Reduction for Piezo Mechanical Systems


November 20th, 2012
The article Computation of a Compact State Space Model for an Adaptive Spindle Head Configuration with Piezo Actuators using Balanced Truncation will appear in volume 6 issue 6 of the Springer journal Production Engineering Research and Development. It covers efficient numerical methods for the model order reduction of the resulting index 1 differential algebraic systems via balanced truncation.

New Preprint: Peter Benner, Patrick Kürschner, Jens Saak:
An Improved Numerical Method for Balanced Truncation for Symmetric Second Order Systems


November 8th, 2012
We consider balanced truncation model order reduction for symmetric second order systems. The occurring large-scale generalized and structured Lyapunov equations are solved with a specially adapted low-rank ADI type method. Stopping criteria for this iteration are investigated and a new result concerning the Lyapunov residual within the low-rank ADI method is established. We also propose a goal oriented stopping criterion which tries to incorporate the balanced truncation approach already during the ADI iteration. The model reduction approach using the ADI method with different stopping criteria is evaluated on several test systems.
TR96

Events: 2nd colloquium of SFB/TR-96 on 10/24-25/12 in Chemnitz, Fraunhofer IWU


October 24th, 2012
The second colloquium of the SFB/TR-96 takes place at Fraunhofer IWU in Chemnitz from 24th to 25th of october. For further informations have a look at the official webpage of the SFB/TR-96

New Preprint: Peter Benner, Jens Saak, Friedhelm Schieweck, Piotr Skrzypacz, Heiko K. Weichelt:
A Non-Conforming Composite Quadrilateral Finite Element Pair for Feedback Stabilization of the Stokes Equations


October 19th, 2012
The authors show a method for boundary feedback stabilization of the Stokes around a stationary trajectory using a new non-conforming finite element method that represents the action of the Leray projection pointwise locally.

Events: Chemnitz FEM Symposium


September 25th, 2012
The Chemitz FEM Symposium is celebrating a triple jubilee this year. At the 25th symposium Arnd Meyer and Ulrich Langer are celebrating their 60th birthdays. The CSC group is congratulating and sends Peter Benner, Jens Saak(poster presentation) and Piotr Skrzypacz (talk) to participate in the event.
GAMM DynCont

Events: Workshop and meeting of GAMM activity group "Dynamics and Control"


September 19th, 2012
This years second meeting of the GAMM activity group on "Dynamics and Control" will take place together with the GMA activity groups 1.30 and 1.40 as usual on a bi-anual basis. The meeting is scheduled September 17 to 21 at Sporthotel Anif near Salzburg. The talks of the GAMM activity group will take place on Wednesday 19th and contain contributions by Patrick Kürschner, Jens Saak and M. Monir Uddin. Also Matthias Voigt is participating as member of the activity group.
GAMM CSE

Events: Kick-off meeting of the GAMM CSE activity group


September 17th, 2012
Peter Benner, Jens Saak und Martin Stoll are visiting the kick-off meeting of GAMM activity group Computational Science and Engineering (CSE) in Garching on September 17th and 18th.
GAMM ANLA

Events: XII GAMM Workshop on Applied and Numerical Linear Algebra


September 2nd, 2012
From September 2nd to 5th the 12th GAMM Workshop on Applied and Numerical Linear Algebra is taking place on Chateau Liblice in Czech Republic. The CSC group will give talks by Jens Saak, Kapil Ahuja, and Heiko Weichelt.
otto

CSC News: Linux cluster otto now computing faster


July 20th, 2012
The Linux cluster otto that was installed at the institute last year was extended during the week from july 16. to july 20. The user can now access 90 equal compute nodes based on Intel Xeon Westmere CPUs and an overall memory of 4,32TB. The current installation is now providing a theoretical peak performance of 11.5 TFlops (11.5 trillion floating point operations per second). The effective practical performance was measured using the LINPACK Benchmark that is also used for the TOP500 (http://www.top500.org) ranking of fastest super computers in the world. Here the updated system reached a measured performance of 10.36TFlops, which corresponds to 90.1% of the theoretic peak performance. Furthermore 16 AMD Opteron based nodes deliver an additional 2.2TFlops compute capacity.

The cluster is supporting the work of all research groups at the institute. With its help many experiments and molecules can be simulated that would not have been doable on a standard workstation, or that would have require unacceptable execution times. The research group Computational Methods in Systems and Control Theory that is in charge of the device, is using the cluster to develop parallel numerical algorithms for model reduction and optimal control.

SIAM ALA

Events: SIAM Applied Linear Algebra


June 16th, 2012
From June 18th to 22nd the SIAM Applied Linear Algebra conference 2012 is taking place in Valencia (Spain). The Computational Methods in Systems and Control Theory group is organizing two Minisymposia (Jens Saak and Martin Stoll) there. Moreover the group presents five invited Minisymposium talks (Peter Benner, Kapil Ahuja, Tobias Breiten, Jens Saak and Martin Stoll), as well as three contributed talks (Martin Hess, Patrick Kürschner und M. Sahadet Hossain) in several sections.

Open Position: Student Assistant


May 16th, 2012
extension and maintenance of the research groups web site. Contact: Jens Saak. This news entry is expired.

New visitor: Jan Heiland visiting from TU Berlin


April 18th, 2012
Jan Heiland from TU Berlin will be visiting the CSC group. He will give a presentation titled Differential-algebraic Riccati Decoupling in Optimal Control of Flows in the CSC Reading Group. Main reason for the visit is a projected collaboration with Jens Saak, Norman Lang and Heiko Weichelt.

CSC News: Three Interns Working with CSC


April 2nd, 2012
Starting from May, three interns will visit CSC for two to three months. Kumod Ranjan (National Institute of Technology, Warangal (India)) who got a DAAD WISE scholarship will assist Jens Saak with his work. Furthermore, Peihong Jiang (University of Rochester (USA)) who received a grant from the DAAD RISE program and Maximilian Bremer (University of Texas at Austin (USA)) will join Matthias Voigt.
GAMM logo

CSC News: MPCSC at GAMM Annual Meeting in Darmstadt


March 30th, 2012
Also this year our group contributes to the GAMM Annual Meeting. Martin Stoll and Matthias Voigt participate in organizing two Minisymposia. The both and Tobias Breiten, Sara Grundel, Martin Heß, Patrick Kürschner, Thomas Mach, and Jens Saak give talks at the GAMM Annual Meeting 2012 in Darmstadt.

Thesis Topic: Bachelor Thesis


January 19th, 2012
 
Optimal Control of a second order partial differential equation with acceleration measurements. Optimal control problems for infinite dimensional second order systems with acceleration measurements are in general ill-posed. Jacob and Morris proposed a method exploiting the actual implementation of the measurement that pulls the problem back to a well posed one. Here such a system is to be implemented and solved numerically.
Contact: Jens Saak

Thesis Topic: Bachelor Thesis


January 18th, 2012
 
Simultaneous iterative solution of the adjoint linear systems in the dual low-rank ADI iteration for Lyapunov equations
Solving dual large-scale Lyapunov equations is a main step for carrying out balanced truncation model order reduction for linear, time-invariant control systems. Both Lyapunov equation can be solved simultaneously in one run of the dual low-rank ADI iteration. Here we are going to investigate the simultaneous iterative solution of the occurring adjoint linear systems with BiCG / QMR.
Contact: Patrick Kürschner
HSV approximation

New Preprint: First MPIMD-preprint in 2012 published


January 5th, 2012
Peter Benner, Patrick Kürschner and Jens Saak have published the first preprint in 2012 in the MPIMD preprint series. The preprint is entitled "A Goal-Oriented Dual LRCF-ADI for Balanced Truncation".
Start with low accuracy!

New Preprints: 3 Preprints in 5 Days


December 19th, 2011
The CSC group published 3 new preprints in the last 5 days:
  • Peter Benner, Tobias Breiten: On optimality of interpolation-based low-rank approximations of large-scale matrix equations
  • Peter Benner, Martin Köhler, Jens Saak: Sparse-Dense Sylvester Equations in ℋ₂-Model Order Reduction
  • Thomas Mach, Jens Saak: Towards an ADI iteration for Tensor Structured Equations
UJI

CSC News: Visiting UJI Castellon


October 10th, 2011
I will use a research grant from the UJI in Castellon (Spain) for a visit to the group of Enrique Quintana-Orti. Together with Alfredo Remon i am planning to continue our work on GPU based matrix equation solvers.
SFB-TR96

Events: 1. General Assembly of the DFG Transregio 96 at TU Dresden


October 4th, 2011
On October 4th and 5th all members of the DFG Transregio SFB 96 Thermo-energetic design of machine tools meet at TU Dresden for their first general assembly. During the 2 days workshop the 19 participating subprojects present their current and future work for the first year of existence. Peter Benner, Norman Lang and Jens Saak will join as responsible for project A06 Model Order Reduction for Thermo-Elastic Assembly Group Models and establish contacts to the persons in charge of the other simulation projects.
GAMM logo

Events: GAMM Workshop Applied Linear Algebra


September 22nd, 2011
The GAMM Workshop 2011 on Applied and Numerical Linear Algebra with Special Emphasis on Model Reduction will be held in Bremen on 22 and 23 September 2011. Peter Benner is member of the organizing committee. Tobias Breiten, Patrick Kürschner, Thomas Mach, Jens Saak, and André Schneider present their work in contributed talks. The workshop is followed by a special colloquium celebrating the 60th birthday of Angelika Bunse-Gerstner.

Events: 17th ILAS Conference in Braunschweig


August 22nd, 2011
The 17th ILAS Conference will be held in Braunschweig from 22 to 26 august 2011. Peter Benner is member of the organizing committee. Jens Saak and Alfredo Remón Gómez (Universitat Jaume I, Castelló de la Plana) are organizing an YR minisymposium on Parallel Computing in Numerical Linear Algebra. Further several group members will give contributed talks.

Thesis Topic: Diplom/Master Thesis:


July 7th, 2011
 
Regulator based tracking control of a parabolic partial differential equation under control constraints
We are searching for a regulator based feedback control u. Since this is not covered by the linear quadratic regulator approach, we first compute a reference pair of control and solution trajectory via open loop optimization. The resulting pair is then tracked by the regulator based feedback control.
Contact: Jens Saak

Open Position: Student Assistant


July 6th, 2011
extension and maintenance of the research groups web site. Contact: Jens Saak. This news entry is expired.

Open Position: Student Assistant


July 6th, 2011
Further development of the software library M.E.S.S. Contact: Martin Köhler. This news entry is expired.
Transregio 96

CSC News: DFG funding Transregio 96


July 1st, 2011
Deutsche Forschungs Gemeinschaft (DFG) sets up new Transregio SFB 96 Thermo-Energetic Design of Machine Tools at Technical Universities Dresden and Chemnitz, as well as RWTH Aachen. The Chemnitz part of our research group is participating with project A06 Model Order Reduction for thermo-elastic assembly group models.
Lange Nacht der Wissenschaft

Events: 6th Science Night in Magdeburg


May 28th, 2011
Saturday, 28th May 2011, 6.00 a.m. to 1.00 p.m., Max Planck Institute Magdeburg
We cordially invite you and your family to discover basic research in the engineering sciences: during guided tours through our institute, short lectures on our research topics and in experiments for kids and grown-ups! Our program for you (in German) ...
Linux Cluster Otto

CSC News: Linux-Cluster Otto in the Press


May 26th, 2011
Newsropa.de have an article on our new Linux-cluster otto. Further the Volksstimme have an article in their print-version on otto.
Osijek - Nationaltheater, Quelle: wikipedia.org

CSC News: Jens in Osijek, Croatia


May 2nd, 2011
Jens Saak is invited to J. J. Strossmayer University of Osijek to give a lecture on Algebraic Riccati Equations from May 2 to 06. Additionally he give a colloquiums talk at 5th May on Numerical Solution of Linear Quadratic Regulator Problems under PDE Constraints.
CSC while talk

CSC News: First CSC research group weekend workshop


April 7th, 2011
CSC research group met the first time for a research group weekend workshop in Clausthal Zellerfeld in the Harz Mountains from April 7th to April 11th. Besides 14 discussion forums about problems of the recent group research a visit in a local glass factory, a BBQ, a hike, a campfire, and sports (Bildungsstätte der Sportjugend Niedersachsen) was scheduled.

CSC News: Project Meeting


January 25th, 2011
Hermann Mena (ENP Quito, Ecuador) is visiting the MPI Magdeburg again. Together with René Schneider (TU Chemitz) we will continue the cooperation in the project aerial-spray-drift.
WIAS Logo

Events: MOR2011


January 20th, 2011
Peter Benner, Martin Heß, Jens Saak, Judith Schneider und André Schneider join the Workshop on Model Order Reduction in Optimization and Control with PDEs from 26th to 28th January 2011 at WIAS in Berlin.
Screenshot of the new Webpage

CSC News: New CSC Webpage


November 16th, 2010
The new Group Webpage is almost complete. We have copied large parts of the old MiIT-Webpage, neverless some parts are still under construction. If you do not find the informations you search, do not hesitate to ask us!