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Sökning: WFRF:(Sandström Thomas) > Konferensbidrag

  • Resultat 1-10 av 19
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1.
  • Becker, Matthias, et al. (författare)
  • Increased Reliability of Many-Core Platforms through Thermal Feedback Control
  • 2014
  • Ingår i: Performance, Power and Predictability of Many-Core Embedded Systems 3PMCES'14. - Dresden, Germany.
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we present a low overhead thermal management approach to increase reliability of many-core embedded real-time systems. Each core is controlled by a feedback controller. We adapt the utilization of the core in order to decrease the dynamic power consumption and thus the corresponding heat development. Sophisticated control mechanisms allow us to migrate the load in advance, before reaching critical temperature values and thus we can migrate in a safe way with a guarantee to meet all deadlines.
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2.
  • Becker, Matthias, et al. (författare)
  • Limiting temperature gradients on many-cores by adaptive reallocation of real-time workloads
  • 2014
  • Konferensbidrag (refereegranskat)abstract
    • The advent of many-core processors came with the increase in computational power needed for future applications. However new challenges arrived at the same time, especially for the real-time community. Each core on such a processor is a heat source and uneven usage can lead to hot spots on the processor, affecting its lifetime and reliability. For real-time systems, it is therefore of paramount importance to keep the temperature differences between the individual cores below critical values, in order to prevent premature failure of the system. We argue that this problem can not be solved by traditional approaches, since the growing number of cores makes them intractable. We rather argue to split the problem in the spacial domain and control the temperature on core level. The cores control their temperature by rearranging the load in a predictable manner during runtime. To achieve this, a feedback controller is implemented on each core. We conclude our work with a simulation based evaluation of the proposed approach comparing its performance against a previously presented algorithm.
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3.
  • Becker, Matthias, et al. (författare)
  • Mapping Real-Time Tasks onto Many-Core Systems considering Message Flows
  • 2014
  • Ingår i: Proceedings of the Work-in-Progress Session of the 20th IEEE Real-Time and Embedded Technology and Applications Symposium. - Berlin, Germany. ; s. 17-18
  • Konferensbidrag (refereegranskat)abstract
    • In this work we focus on the task mapping problem for many-core real-time systems. The growing number of cores connected by a Network-on-Chip (NoC) calls for sophisticated mapping techniques to meet the growing demands of real-time applications. Hardware should be used in an efficient way such that unnecessary resource usage is avoided. Because of the NP-hardness of the problem, heuristic and meta-heuristic techniques are used to find good solutions. We further consider periodic communication between tasks and we focus on a static mapping solution.
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  • Hallmans, Daniel, et al. (författare)
  • GPGPU for Industrial Control Systems
  • 2013
  • Ingår i: 18th IEEE International Conference on Emerging Technologies & Factory Automation ETFA'13. - 978-1-4799-0862-2 ; s. Article number 6648166
  • Konferensbidrag (refereegranskat)abstract
    • In this work in progress paper we present parts of our ongoing work on using the Graphical Processing Unit (GPU) in the context of Embedded Systems. As a first step we are investigating the possibility to move functions from a Digital Signal Processor (DSP) to a GPU. If it is possible to make such a migration then it would simplify the hardware designs for some embedded systems by removing external hardware and also remove a potential life cycle issue with obsolete components. We are currently designing a test system to be able to compare performance between a legacy control system used today in industry, based on a CPU/DSP combination, to a new design with a CPU/GPU combination. In this setting the pre-filtering of sampled data, previously done in the DSP, is moved to the GPU.
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  • Olsson, Håkan, et al. (författare)
  • Using remote sensing as a tool within the reindeer industry: Scientific aspects of Renbruksplan
  • 2002
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Because of the large tracts of lands used for reindeer grazing, the needs of the reindeer industry at times conflict with the needs of other land users. Remote sensing and GIS become valuable tools in attempting to resolve the complex issues of the different seasonal and temporal needs of the reindeer in relation to the needs and activities of other land users. Until recently, lack of overview and understanding - both by reindeer herders and other land users - of the land-use pattern of reindeer herding has lead to unnecessary conflict between different land users. In an attempt to resolve this complex issue a process has been developed to produce “land-use plans for reindeer husbandry” (in Swedish Renbruksplan (RBP)). The process included a number different and sometimes “unique” methods used in the digital capture of traditional ecological knowledge both through satellite image interpretation and field work, as well as different methods of digital image classification. The satellite image interpretation, on-screen digitizing, and field work leading to the identification of important grazing lands was carried out by the Sami village members with support from researchers. The combination of great knowledge about the local area and the familiarity interpreting satellite images was necessary for successful delineation of important grazing lands, a process which was followed by field visits to all identified important grazing lands. The process of developing RBP further included different methods of digital image classification. In the forested portion of the Sami villages we used the k-Nearest Neighbor method to produce estimates of occurrence for each reindeer grazing type. We then combined these estimates into one reindeer grazing type map with discrete classes. For the mountainous portion we used an unsupervised “hyperclustering” classification procedure in order to produce a vegetation maps for the area. Information from several parallel ongoing processes was combined with compiled information about activities of other land-users in the final RBP. The ultimate goal is that RBP will contribute to increased knowledge and understanding between different resource users and thereby reduce conflict. During 2000-2002, the project has been ongoing in Vilhelmina Norra and Malå Sami villages in the county of Västerbotten in northern Sweden. In addition to participants from the two Sami villages and SLU, cooperators include the Regional Forestry Board, the County Administrative Board of Västerbotten and Norwegian Institute if Nature Research (NINA). In the coming years we will use and refine the methods and produce RBP in additionally four Sami villages
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  • Resultat 1-10 av 19
  • [1]2Nästa
 
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