The energy efficiency of computing systems can be enhanced via power models that provide insights into how the systems consume power. However, there are no application-general, fine-grained and validated power models ...
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Integrated Modular Avionics (IMA) architectures complemented with Time-Triggered Ethernet (TTEthernet) provides a strong platform to support the design and deployment of distributed avionic software systems. The compl...
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Integrated Modular Avionics (IMA) architectures complemented with Time-Triggered Ethernet (TTEthernet) provides a strong platform to support the design and deployment of distributed avionic software systems. The complexity of the design and continuous integration of such systems can be managed using a model-based methodology. In this paper, we build on top of our extension of the AADL modeling language to model TTEthernet-based distributed systems and leverage model transformations to enable undertaking the verification of the system models produced with this methodology. In particular, we propose to transform the system models to a model suitable for a simulation with DEVS. We illustrate the proposed approach using an example of a navigation and guidance system and we use this example to show the verification of the contention-freedom property of TTEthernet schedule. (C) 2016 The Authors. Published by Elsevier B.V.
Edge Computing is a fast growing field of research covering a spectrum of technologies such as Cloudlets, Fog Computing and Mobile Edge Computing (MEC). Edge Computing involves technically more sophisticated setup whe...
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ISBN:
(纸本)9781538628607
Edge Computing is a fast growing field of research covering a spectrum of technologies such as Cloudlets, Fog Computing and Mobile Edge Computing (MEC). Edge Computing involves technically more sophisticated setup when compared with the pure Cloud Computing and pure Mobile Computing cases since both computational and network resources should be considered simultaneously. In that respect, it provides a larger design space with many parameters rendering a variety of novel approaches feasible. Given the complexity, Edge Computing designs deserve scientific scrutiny for sound assessment of their feasibility. However, despite increasing research activity, this field lacks a simulation tool compatible with the requirements. Starting from available simulators a significant programming effort is required to obtain a simulation tool meeting the actual needs. To decrease the barriers, a new simulator tool called EdgeCloudSim streamlined for Edge Computing scenarios is proposed in this work. EdgeCloudSim builds upon CloudSim to address the specific demands of Edge Computing research and support necessary functionality in terms of computation and networking abilities. To demonstrate the capabilities of EdgeCloudSim an experiment setup based on different edge architectures is simulated and the effect of the computational and networking system parameters on the results are depicted.
Traditional Database Management System (DBMS) software relies on hard disks for storing relational data. Hard disks are cheap, persistent, and offer huge storage capacities. However, data retrieval latency for hard di...
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This paper focuses on smart power management systems for application in the Low Voltage power distribution. In particular, we consider load management systems based on distributed control implemented by processors emb...
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ISBN:
(纸本)9781509046836
This paper focuses on smart power management systems for application in the Low Voltage power distribution. In particular, we consider load management systems based on distributed control implemented by processors embedded in power circuit breakers: such systems can control connection and disconnection of loads with the purpose of maintaining average power within preset boundaries, preventing demand peaks. With the purpose of testing load management systems in a realistic condition, a real time, hardware in the loop testbed has been designed and built. The testbed employs a mathematical model of the electrical consumption of the installation: based on such model, real time, simulated current and voltage signals are generated, that the controller uses as measurement inputs. Based on such inputs, the controller trigger load activation and deactivation strategy. In turn, activation and deactivation commands are fed back into the simulation testbed and taken into account for the continuation of simulation, thus closing the loop. The simulation system includes a complete graphical operator interface, which can be used for demonstration and training purposes, so that performance and operation of load management systems can be made apparent. After describing the architecture and components of the designed system, a test case used for validation is shown.
In evaluating performance, schedulability, and energy efficiency metrics for real-time systems, numerous algorithms have been proposed to construct synthetic tasksets for simulation. The resulting taskset characterist...
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ISBN:
(纸本)9781538603932
In evaluating performance, schedulability, and energy efficiency metrics for real-time systems, numerous algorithms have been proposed to construct synthetic tasksets for simulation. The resulting taskset characteristics should ideally reflect real workloads while the algorithms generating these tasksets should be efficient. Any experimentation using these tasksets will highly depend on their properties. Current approaches construct the sets by choosing taskset periods and utilisation from statistical distributions and compute the task worst case execution times accordingly. Tasks are generated through timed loops or matrix operations up to the specified task WCET. At times, the taskset hyper-period is bounded to minimise simulation interval through selected assignment of task periods. However, tasks which burn processor cycles through loops and matrix operations do not always reflect realistic task loads. In this paper, we propose a methodology for generating realistic tasksets based on available embedded benchmarks. We extend on previous work and propose new algorithms: CPA-AU/DU (Compute-Propagate-Adjust Ascending/Descending Utilisation) which efficiently pair taskset WCETs with selected discrete periods. Our tasksets have bounded and feasible simulation interval and meet desired total utilisation with minimum digression errors. We also show that our algorithms run in polynomial time.
Summary form only given. This talk discusses some positive and negative trends in the field. It briefly examines some case studies, and finally discusses things that we as a community could do better.
ISBN:
(纸本)9781509030774
Summary form only given. This talk discusses some positive and negative trends in the field. It briefly examines some case studies, and finally discusses things that we as a community could do better.
The purpose of this study was to describe the 3-D nano-scaled surface texture of the Nickel–Carbon(Ni–C) nanocomposite thin films composed of Ni nanoparticles with different average sizes embedded in amorphous hydro...
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The purpose of this study was to describe the 3-D nano-scaled surface texture of the Nickel–Carbon(Ni–C) nanocomposite thin films composed of Ni nanoparticles with different average sizes embedded in amorphous hydrogenated carbon using stereometric analysis. The 3-D nanoscaled surface texture was studied by atomic force microscopy(AFM) and stereometric analysis. In a wider context, we also discuss our findings with regard to manufacture of the Nickel-Carbon composite thin films with desired surface characteristics.
This article focuses on modeling of different options of antenna system including and in particular an antenna for the capsule endoscope (transmitter antenna) of the capsule endoscopic complex "Landish". A h...
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This article focuses on modeling of different options of antenna system including and in particular an antenna for the capsule endoscope (transmitter antenna) of the capsule endoscopic complex "Landish". A helical antenna is reviewed for the transmitter, as well as a patch antenna on a curved substrate, and a quarter-wave monopole vibrator and a ceramic antenna. An experiment was conducted in order to compare the gain of the antennas at a fixed position in the space of the transmitting antennas, and the impact of the human body on the features of antennas. Recommendations on the choice of antenna systems in accordance with the simulation results are provided.
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