Aktuelle Veröffentlichungen
Konferenz- & Workshop-Beiträge
- CBM Collaboration, L. Meder, S. Baehr, S. Figuli, J. Becker
Challenges in QCD matter physics - The Compressed Baryonic Matter experiment at FAIR
In https://arxiv.org/abs/1607.01487, 2016 - S. Baehr, S. Neuhaus, S. Skambraks, C. Kiesling, J. Becker
A Neural Network on FPGAs for the z-Vertex Track Trigger in Belle II
In Topical Workshop on Electronics for Particle Physics (TWEPP) 2016, 2016 - D. V. Vu, O. Sander, T. Sandmann, J. Heidelberger, S. Baehr, J. Becker
On-Demand Reconfiguration for Coprocessors in Mixed Criticality Multicore Systems
In 7th International Workshop on Dependable Many-Core Computing (DMCC 2015), 2015 - F. Bapp, O. Sander, T. Sandmann, D. V. Vu, S. Baehr, J. Becker
Adapting Commercial Off-The-Shelf Multicore Processors for Safety-Related Automotive Systems Using Online Monitoring
In SAE 2015 World Congress and Exhibition, 2015 - S. Baehr, O. Sander, M. Heck, M. Feindt, J. Becker
A framework for porting the NeuroBayes machine learning algorithm to FPGAs
In Topical Workshop on Electronics for Particle Physics (TWEPP) 2015, 2015 - D. Adam, S. Tverdyshev, C. Rolfes, T. Sandmann, S. Baehr, O. Sander, J. Becker, U. Baumgarten
Two Architecture Approaches for MILS Systems in Mobility Domains (Automobile, Railway and Avionik)
In International Workshop on MILS: Architecture and Assurance for Secure Systems (MILS 2015), 2015
Zusammenfassung:
Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 (sqrt(s_NN) = 2.7 - 4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials (mu_B > 500 MeV), effects of chiral symmetry, and the equation-of-state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2022, in the context of the worldwide efforts to explore high-density QCD matter.
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Zusammenfassung:
Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 (sqrt(s_NN) = 2.7 - 4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials (mu_B > 500 MeV), effects of chiral symmetry, and the equation-of-state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2022, in the context of the worldwide efforts to explore high-density QCD matter.
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Link
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Zusammenfassung:
Background originating from events outside of the interaction point is going to play a
major role in the upcoming Belle II experiment. In order to reduce this background a track trigger
based on the reconstruction of an event’s z position is employed on FPGAs. This paper presents
the architecture and implementation of neural networks and supporting preprocessing that is going
to be used at the upcoming cosmic ray test of Belle II. By using hit information from simulations,
figures of merit like latency, accuracy and resource demand are presented.
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Zusammenfassung:
Background originating from events outside of the interaction point is going to play a
major role in the upcoming Belle II experiment. In order to reduce this background a track trigger
based on the reconstruction of an event’s z position is employed on FPGAs. This paper presents
the architecture and implementation of neural networks and supporting preprocessing that is going
to be used at the upcoming cosmic ray test of Belle II. By using hit information from simulations,
figures of merit like latency, accuracy and resource demand are presented.
Download:
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BibTeX: Anzeigen
Zusammenfassung:
Especially in complex system-of-systems scenarios, where multiple high-performance or real-time processing functions need to co-exist and interact, reconfigurable devices together with virtualization techniques show considerable promise to increase efficiency, ease integration and maintain functional and non-functional properties of the individual functions. In a previous work, we proposed a concept that leverages the advantages of FPGA's partial reconfiguration in heterogeneous mixed criticality multicore systems. The basic idea how to handle the partial reconfiguration transparently for non-critical tasks, while providing full control and a predictable behavior for safety relevant tasks was described. In this paper, we focus on the on-demand partial reconfiguration of non-critical coprocessor and its implementation details. Our prototype is implemented on an Intel multicore system and a Xilinx Virtex-7 FPGA connected via PCI Express (PCIe), taking advantage of the Single-Root I/O Virtualization (SR-IOV) capabilities in modern PCIe implementations. Experimental results show that our concept achieves significantly shorter reconfiguration time with lower variance under various load situations.
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Momentan nicht verfügbar
BibTeX: Anzeigen
Zusammenfassung:
Especially in complex system-of-systems scenarios, where multiple high-performance or real-time processing functions need to co-exist and interact, reconfigurable devices together with virtualization techniques show considerable promise to increase efficiency, ease integration and maintain functional and non-functional properties of the individual functions. In a previous work, we proposed a concept that leverages the advantages of FPGA's partial reconfiguration in heterogeneous mixed criticality multicore systems. The basic idea how to handle the partial reconfiguration transparently for non-critical tasks, while providing full control and a predictable behavior for safety relevant tasks was described. In this paper, we focus on the on-demand partial reconfiguration of non-critical coprocessor and its implementation details. Our prototype is implemented on an Intel multicore system and a Xilinx Virtex-7 FPGA connected via PCI Express (PCIe), taking advantage of the Single-Root I/O Virtualization (SR-IOV) capabilities in modern PCIe implementations. Experimental results show that our concept achieves significantly shorter reconfiguration time with lower variance under various load situations.
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Zusammenfassung:
Multicores, being the latest state-of-the-art technology, gain more and more importance in automotive and aerospace systems. This technology will not only be used in infotainment and non-safety-critical applications but will also be introduced in upcoming safety-critical systems. At the moment, various commercial off-the-shelf processors are available that are, however, not built for such applications. In order to ensure correct system behavior, online monitoring can be used for processors targeting infotainment or general purpose applications. The cores and other bus masters within the MPSoC compete for the exclusive use of shared resources like a memory controller. It is of high importance to provide guarantees of usage in such cases, e.g. in terms of access time and rates. For this purpose we present an online monitoring based on a commercial off-the-shelf multicore processor that provides knowledge about the usage of the direct memory access (DMA) controller in terms of accesses and activation sources. Furthermore, with this information, conclusions about the memory controller workload are drawn. The concept is implemented by using Freescale’s i.MX6 Quad platform, which is targeting automotive infotainment. This paper aims to show how such general purpose multicore processors can be partly adapted to provide evidence for safety related systems.
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Link
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Zusammenfassung:
Multicores, being the latest state-of-the-art technology, gain more and more importance in automotive and aerospace systems. This technology will not only be used in infotainment and non-safety-critical applications but will also be introduced in upcoming safety-critical systems. At the moment, various commercial off-the-shelf processors are available that are, however, not built for such applications. In order to ensure correct system behavior, online monitoring can be used for processors targeting infotainment or general purpose applications. The cores and other bus masters within the MPSoC compete for the exclusive use of shared resources like a memory controller. It is of high importance to provide guarantees of usage in such cases, e.g. in terms of access time and rates. For this purpose we present an online monitoring based on a commercial off-the-shelf multicore processor that provides knowledge about the usage of the direct memory access (DMA) controller in terms of accesses and activation sources. Furthermore, with this information, conclusions about the memory controller workload are drawn. The concept is implemented by using Freescale’s i.MX6 Quad platform, which is targeting automotive infotainment. This paper aims to show how such general purpose multicore processors can be partly adapted to provide evidence for safety related systems.
Download:
Link
BibTeX: Anzeigen
Zusammenfassung:
The NeuroBayes machine learning algorithm is deployed for online data reduction at the pixel detector of Belle-II. In order to test, characterize and easily adapt its implementation on FPGAs, a framework was developed. Within the framework a HDL model, written in python using MyHDL, is used for fast exploration of possible configurations. Under usage of input data from physics simulations figures of merit like throughput, accuracy and resource demand of the implementation are evaluated in a fast and flexible way. Functional validation is supported by usage of unit tests and HDL simulation for chosen configurations.
Download:
Momentan nicht verfügbar
BibTeX: Anzeigen
Zusammenfassung:
The NeuroBayes machine learning algorithm is deployed for online data reduction at the pixel detector of Belle-II. In order to test, characterize and easily adapt its implementation on FPGAs, a framework was developed. Within the framework a HDL model, written in python using MyHDL, is used for fast exploration of possible configurations. Under usage of input data from physics simulations figures of merit like throughput, accuracy and resource demand of the implementation are evaluated in a fast and flexible way. Functional validation is supported by usage of unit tests and HDL simulation for chosen configurations.
Download:
Momentan nicht verfügbar
BibTeX: Anzeigen
Zusammenfassung:
Systems with mixed and independent levels of security and safety become more and more important in the future. In the German funded Bundesministerium fuer Bildung und Forschung (BMBF) research project ARAMiS (Automotive, Railway and Avionic Multicore Systems) different industry and scientiffic partners concerned on using multi-core processor for different security and safety critical use-cases. This paper describes the motivation and use-cases behind the research actives in different mobility domains. Also two detailed descriptions and a comparison of two implementation for Multiple Independent Levels of Security and Safety (MILS) systems in mobility domains are included. In the end of the paper a outlook is given on potential further research activities on this research topic.
Download:
Momentan nicht verfügbar
BibTeX: Anzeigen
Zusammenfassung:
Systems with mixed and independent levels of security and safety become more and more important in the future. In the German funded Bundesministerium fuer Bildung und Forschung (BMBF) research project ARAMiS (Automotive, Railway and Avionic Multicore Systems) different industry and scientiffic partners concerned on using multi-core processor for different security and safety critical use-cases. This paper describes the motivation and use-cases behind the research actives in different mobility domains. Also two detailed descriptions and a comparison of two implementation for Multiple Independent Levels of Security and Safety (MILS) systems in mobility domains are included. In the end of the paper a outlook is given on potential further research activities on this research topic.
Download:
Momentan nicht verfügbar
BibTeX: Anzeigen
