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检索条件"机构=Design of Distributed Embedded Systems"

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Agent-based modeling and simulation of artificial immune systems

Agent-based modeling and simulation of artificial immune sys...

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作者： Montealegre, Norma Rammig, Franz J. Design of Distributed Embedded Systems Group Heinz Nixdorf Institute Paderborn Germany

ISBN: (纸本)9780769546698

Agent-based modeling and simulation is a way to model the behavior of populations of components and their interactions within a system. The key of this approach is to model the components of the system as autonomous agents and to simulate their behavior for evaluating the system as a whole. That is very useful for observing the emergence of properties in social, biological, environmental or financial systems, among others. Artificial immune systems, which is a sub field of artificial intelligence, comprises systems modeled by simplifying models from the biological immune system. If agent-based modeling and simulation is used as a laboratory for understanding the biological immune system then, it can also be used for transferring the observed principles into artificial immune system models or for evaluating models that have been already adapted for solving technical problems. This paper presents first, a methodology for transferring principles of the biological immune system into the field of artificial immune systems. Then, it presents a brief explanation of the behavior of the cells of the biological immune system, which are treated as internal agents inside a biological organism. Afterwards, the modeling of some selected type of cells and the simulation of the whole simplified system are presented. In the end, the principles of that simplified system are transferred into the design of an alarm management system for the smart grid. © 2012 IEEE.

关键词： Smart power grids

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Deterministic runtime adaptation for hard real-time embedded systems with processing constraints

Deterministic runtime adaptation for hard real-time embedded...

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2nd International Conference on Pervasive embedded Computing and Communication systems, PECCS 2012

作者： Tariq, Fahad Bin Department of Design of Distributed Embedded Systems University of Paderborn Fuerstenallee 11 Paderborn Germany

ISBN: (纸本)9789898565006

Increasing the connectivity of systems at various levels gives rise to potential benefits that is addressed by trends such as the Internet of Things, Cyber-Physical systems and Cyber-Biosphere. It is inevitable that the vast global network will consist of computationally constrained units. The ability of such systems to adapt while being connected to a global network presents new opportunities. Qualities such as fault tolerance and load sharing may be extended to nodes in the network that initially were devoid of them. On the other hand, an open adaptable system that does not limit its adaptation to pre-defined and pre-containing states needs to be connected to one or more sources that may provide the necessary behavioral units to switch to the new state. Extending computationally constrained nodes with the ability to adapt is in itself challenging, which increases when timely behavior is required due to real-time requirements. The system must then guarantee all deadlines implying the need for deterministic adaptation. The question of when to adapt becomes an important one with real-time deadlines involved. We present our work on a framework that aims to achieve deterministic runtime adaptation on single processor systems thereby enabling such computationally constrained systems to extend their functionality and non-functional qualities.

关键词： embedded systems

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Partitioning granularity, communication overhead, and adaptation in OS services for distributed reconfigurable systems on Chip

Partitioning granularity, communication overhead, and adapta...

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International Conference on Computational Science and Engineering

作者： Samara, Sufyan Design of Distributed Embedded Systems Heinz Nixdorf Institute University of Paderborn Paderborn Germany

ISBN: (纸本)9780769543239

distributed embedded systems are exposed to variable applications and requirements. This results in a dynamic and unpredictable changes in the availability of resources. Existing operating system implementations for embedded devices are struggling to address the challenges of efficiently utilizing modern target platforms with heterogeneous computational elements and variable resources. To cope with these challenges, operating system services can be partitioned into small blocks that can run on any computational element and use different resource combinations in the target platform. Although this partitioning allows flexibility and adaptation, it also introduces undesired inter-partition communication overhead. In this paper we discuss a lower bound for the partitioning granularity in order to provide a trade off between communication overhead and adaptation. In addition, we argue the usage of pipelining as an approach to reducing the communication overhead. As a proof of concept a case study is presented. © 2010 IEEE.

关键词： System-on-chip

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Demonstration of the fault recognition and recovery of FPGA circuits by means of cytokine-formal immune networks

Demonstration of the fault recognition and recovery of FPGA ...

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2009 International Conference on Field-Programmable Technology, FPT'09

作者： Montealegre, Norma Design of Distributed Embedded Systems Heinz Nixdorf Institute Fuerstenalle 11 33102 Paderborn Germany

ISBN: (纸本)9781424443772

Self-repairing systems under system failure, return service faster by means of a recovery oriented design. A selfrepairing system is composed of a system, which in its most general form is composed by an input and an output, a self-testing module and a recovery module. The self-testing module requires a test pattern generator and a test response evaluator. The test pattern generator should generate an optimal minimal set of test vectors. The test response evaluator should be fast in order to shorten the time the system is out of service. The recovery module could have options like: reset of the system, select another operation through an operation selector or reconfigure the system. Reconfiguration could take place placing the same operation in another circuit area or another operation in the same circuit area. Last option is possible in FPGA circuits thanks to reconfiguration support. But, FPGAs are sensitive to radiation and also prone to errors. Approaches like Triple Modular Redundancy, Embryonics or Immunotronics are an attempt to deal with faults, nevertheless they do not consider standard FPGAs. I propose an approach that focuses fault tolerance from the design perspective. First an optimal minimal set of test vectors is intended to be obtained. Second, a fast evaluation technique for the test response evaluator is searched. And third, a procedure for error correction is drafted. The demonstration presents an algorithm and an architecture based on the Cytokine - Formal Immune Networks for preparing the set of test vectors and built a suitable fault recognition unit which supports recovery. A self-repairing system is shown by means of a hardware implementation in a FPGA board. © 2009 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Automatic speech recognition front-end implemented by means of algorithmic skeletons and partial reconfiguration

Automatic speech recognition front-end implemented by means ...

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21st IASTED International Conference on Parallel and distributed Computing and systems, PDCS 2009

作者： Montealegre, Norma Kataev, Vadim Design of Distributed Embedded Systems Heinz Nixdorf Institute Paderborn Germany University of Paderborn Paderborn Germany

ISBN: (纸本)9780889868113

A speech recognition front-end is a digital signal processing device used to transform an audio signal into feature vectors used for Automatic Speech Recognition or storage of semantic audio information. The complete implementation of this device does not fit in the fabric of the FPGA of the used development board. Exploiting the inherent parallelism seen in the design of the device, the redesigning using a developed library of algorithmic skeletons and the use of dynamic partial reconfiguration have made possible to fit the device into the used FPGA.

关键词： Musculoskeletal system

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On the homogeneous multiprocessor virtual machine partitioning problem

On the homogeneous multiprocessor virtual machine partitioni...

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4th IFIP TC 10 International embedded systems Symposium, IESS 2013

作者： Groesbrink, Stefan Design of Distributed Embedded Systems Heinz Nixdorf Institute University of Paderborn Fuerstenallee 11 33102 Paderborn Germany

ISBN: (纸本)9783642388521

This work addresses the partitioning of virtual machines with real-time requirements onto a multi-core platform. The partitioning is usually done manually through interactions between subsystem vendors and system designers. Such a proceeding is expensive, does not guarantee to find the best solution, and does not scale with regard to the upcoming higher complexity in terms of an increasing number of both virtual machines and processor cores. The partitioning problem is defined in a formal manner by the abstraction of computation time demand of virtual machines and computation time supply of a shared processor. The application of a branch-and-bound partitioning algorithm is proposed. Combined with a generation of a feasible schedule for the virtual machines mapped to a processor, it is guaranteed that the demand of a virtual machine is satisfied, even if independently developed virtual machines share a processor. The partitioning algorithm offers two optimization goals, required number of processors and the introduced optimization metric criticality distribution, a first step towards a partitioning that considers multiple criticality levels. The different outcomes of the two approaches are illustrated exemplarily. © IFIP International Federation for Information Processing 2013.

关键词： Virtual machine

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Proteus hypervisor: Full virtualization and Paravirtualization for multi-core embedded systems

Proteus hypervisor: Full virtualization and Paravirtualizati...

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4th IFIP TC 10 International embedded systems Symposium, IESS 2013

作者： Gilles, Katharina Groesbrink, Stefan Baldin, Daniel Kerstan, Timo Design of Distributed Embedded Systems Heinz Nixdorf Institute Fuerstenallee 11 33102 Paderborn Germany dSPACE GmbH Rathenaustrasse 26 33102 Paderborn Germany

ISBN: (纸本)9783642388521

System virtualization's integration of multiple software stacks with maintained isolation on multi-core architectures has the potential to meet high functionality and reliability requirements in a resource efficient manner. Paravirtualization is the prevailing approach in the embedded domain. Its applicability is however limited, since not all operating systems can be ported to the paravirtualization application programming interface. Proteus is a multi-core hypervisor for PowerPC-based embedded systems, which supports both full virtualization and paravirtualization without relying on special hardware support. The hypervisor ensures spatial and temporal separation of the guest systems. The evaluation indicates a low memory footprint of 15 kilobytes and the configurability allows for an application-specific inclusion of components. The interrupt latencies and the execution times for hypercall handlers, emulation routines, and virtual machine context switches are analyzed. © IFIP International Federation for Information Processing 2013.

关键词： Virtualization

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Flexible resource management for Self-X systems: An evaluation

Flexible resource management for Self-X systems: An evaluati...

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2010 13th IEEE International Symposium on Object/Component/Service-Oriented Real-Time distributed Computing Workshops, ISORC Workshops 2010

作者： Oberthür, Simon Zaremba, Leszek Lichte, Hermann Simon Department of Design of Distributed Embedded Systems Heinz Nixdorf Institute University of Paderborn Paderborn Germany Computer Networks Group University of Paderborn Paderborn Germany

ISBN: (纸本)9780769540382

In classical real-time systems the resources for an application are allocated at system start so that every resource request can be fulfilled in future. This would lead to much internal waste of resources in the case of modern Self-X systems, because these systems have highly dynamic resource consumptions. The Flexible Resource Manager (FRM) was developed to overcome this problem. The manager puts temporarily unused resources at other applications' disposal. In this paper the FRM approach is evaluated by concrete application examples and randomly generated applications. © 2010 IEEE.

关键词： Real time systems

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Implementation of a singular value decomposition module on an FPGA

Implementation of a singular value decomposition module on a...

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IASTED International Conference on Parallel and distributed Computing and systems, PDCS 2011

作者： Hosseinimehr, Masoud Montealegre, Norma University of Paderborn Warburger Str. 100 Paderborn NRW Germany Design of Distributed Embedded Systems Heinz Nixdorf Institute Fuerstenalle 11 Paderborn NRW Germany

ISBN: (纸本)9780889869073

Since FPGAs are more flexible than general purpose processors, they are used for accelerating the computation of algorithms. Singular value decomposition is the factorization of a matrix, useful in computations executed for signal processing and pattern recognition. This paper deals with the hardware implementation of the singular value decomposition of a given matrix. The used algorithm is based on a compact SVD presented by A. O. Tarakanov. That algorithm compared with others showed to be resource efficient and straightforward for being implemented in hardware. It has been programmed in VHDL and implemented in an FPGA trying to find a compromise among resources, run time, precision and parallelism. The VHDL module uses floating point numbers which bit width can be modified for tuning the precision of the results. Conventional higher level languages for the development of hardware do not allow working with floating point numbers and give rather a less optimal design as the evaluation at the end shows.

关键词： Singular value decomposition

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Self-Adaptive OS Service Model in Relaxed Resource distributed Reconfigurable System on Chip (RSoC)

Self-Adaptive OS Service Model in Relaxed Resource Distribut...

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Future Computing, Service Computation, Cognitive, Adaptive, Content, Patterns, Computation World:

作者： Sufyan Samara Gunnar Schomaker Design of Distributed Embedded Systems University of Paderborn Paderborn Germany

A model for OS services in a distributed RSoCs is presented along with its formal description. The model provides the ability of self-adaptation at runtime. It allows the OS service to change its execution resource needs to accommodate the applications demands. A runtime algorithm is developed to be used with this novel model. The algorithm uses runtime profiling information to manage three resources (area, time, and power). In a relaxed resource distributed RSoCs, the algorithm finds an efficient execution configuration for any requested OS service. This configuration can be reconfigured at runtime to adapt to any resource change and the reconfiguration avoids as much losses as possible. The algorithm has a linear running time and performs multi-criteria optimization.

关键词： System-on-a-chip Runtime distributed computing embedded system embedded computing Resource management Robot sensing systems Hardware Field programmable gate arrays Power system modeling

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