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international conference on Intelligent Transportation

作者： J. Guevara E. Vargas F. Barrero S. Toral Electronic Engineering Department Catholic University of Asunción Paraguay Electronic Engineering Department University of Seville Spain

the widespread use of electronic equipments and their integration into the vehicular system have become a necessity in the automobile industry. the Smart Transducer concept -along with ieee Standard 1451- improves the scalability of these networked electronic devices into a vehicular system. this paper describes the design and implementation of a real-time environmental wireless sensor network that characterizes air quality in Asuncion, Paraguay. Mobile sensor devices in public transport vehicles provide an effective mechanism to develop an efficient solution for this characterization. the development of the sensor network is presented, and experimental results obtained for the characterization of the proposed environmental monitoring system are provided.

关键词： Transducers Intelligent sensors Protocols Computer architecture Mobile communication Consumer electronics Wireless sensor networks

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time-Series Classification Based on Individualised Error Prediction

Time-Series Classification Based on Individualised Error Pre...

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ieee international conference on Computational Science and Engineering, CSE

作者： Krisztian Buza Alexandros Nanopoulos Lars Schmidt-thieme Information Systems and Machine Learning Laboratory University of Hildesheim Hildesheim Germany

time-series classification is an active research topic in machine learning, as it finds applications in numerous domains. the k-NN classifier, based on the discrete time warping (DTW) distance, had been shown to be competitive to many state-of-the art time-series classification methods. Nevertheless, due to the complexity of time-series data sets, our investigation demonstrates that a single, global choice for k (≥ 1) can become suboptimal, because each individual region of a data set may require a different k value. In this paper, we proposed a novel individualized error prediction (IEP) mechanism that considers a range of k-NN classifiers (for different k values) and uses secondary regression models that predict the error of each such classifier. this permits to perform k-NN time-series classification in a more fine grained fashion that adapts to the varying characteristics among different regions by avoiding the restriction of a single value of k. Our experimental evaluation, using a large collection of real timeseries data, indicates that the proposed method is more robust and compares favorably against two examined baselines by resulting in significant reduction in the classification error.

关键词： time series analysis Predictive models Training Accuracy Nearest neighbor searches Data models Training data

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Parametric Control in a Region-Based Coupled MRF Model with Phase Dynamics for Coarse Image Region Segmentation

Parametric Control in a Region-Based Coupled MRF Model with ...

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ieee international conference on Computational Science and Engineering, CSE

作者： Haichao Liang Kazuki Nakada Kenji Matsuzaka Takashi Morie Masato Okada Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology Kitakyushu Japan Graduate School of Frontiers Science University of Tokyo Kashiwa Japan

Towards hardware implementation of real-time visual image processing, we propose a piecewise linear (PWL) approximation of a coupled region-based Markov Random Field (MRF) model with hidden phase variables for coarse image region segmentation. We introduce PWL functions into update equations of the region-based model, in order to make it easy to control parameters that determine the balance between image segmentation and smoothing, as well as to make it efficient for hardware implementation. We can tune filtering properties of our model by controlling the parameters of the PWL functions in applications to a task of coarse image region segmentation. Finally, we demonstrate that closed regions in input images can be represented by phase variables in multi-scale.

关键词： Image segmentation Mathematical model Cost function Computational modeling Smoothing methods Fuses

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SESAM extension for fast MPSoC architectural exploration and dynamic streaming applications

SESAM extension for fast MPSoC architectural exploration and...

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IFIP international conference on Very Large Scale Integration (VLSI-SoC)

作者： N. Ventroux T. Sassolas R. David G. Blanc A. Guerre C. Bechara Embedded Computing Laboratory LIST CEA Gif-sur-Yvette France

Future systems will have to support multiple and concurrent dynamic compute-intensive applications, while respecting real-time and energy consumption constraints. To overcome these computation needs, only multithreaded approaches are possible. thus, the support of a streaming execution model is very important for dataflow applications. However, with dynamic applications, each execution stage is prone to execution time variations. the sizing of these highly complex MPSoC architectures becomes difficult. In such a context, flexible and accurate simulators become a necessity for exploring the vast design space solution. In this paper, we use the SESAM environment to ease the architectural exploration of asymmetric MPSoCs for dynamic streaming application processing. this paper focuses on the new programming and execution model supported by the simulator, and studies performances obtained with a WCDMA encoder/decoder application implemented on a complete MPSoC platform.

关键词： Program processors Computational modeling Memory management Programming Resource management Pipelines

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Schedulability analysis in partitioned systems for aerospace avionics

Schedulability analysis in partitioned systems for aerospace...

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international conference on Emerging Technologies and Factory Automation (ETFA)

作者： João Craveiro José Rufino Faculty of Sciences LaSIGE University of Lisbon Lisboa Portugal

Aerospace mission systems' size, weight and power consumption requirements call for the integration of multiple functions on a single embedded computing platform. A current trend to guard against potential timeliness and safety issues in integrating applications of different natures and providers is the employment of temporal and spatial partitioning. the AIR architecture, defined within initiatives sponsored by the European Space Agency to meet these goals, supports multiple partition operating systems, and advanced timeliness control and adaptation mechanisms. In this paper we propose how to take advantage of composability properties inherent to the build and integration process of AIR-based systems, towards tool-assisted scheduling analysis and configuration support.

关键词： real time systems Schedules Timing XML Aerospace electronics Computer architecture Software

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SESAM: An MPSoC Simulation Environment for Dynamic Application Processing

SESAM: An MPSoC Simulation Environment for Dynamic Applicati...

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international conference on Computer and Information Technology (CIT)

作者： N. Ventroux A. Guerre T. Sassolas L. Moutaoukil G. Blanc C. Bechara R. David Embedded Computing Laboratory Gif-sur-Yvette France

Future systems will have to support multiple and concurrent dynamic compute-intensive applications, while respecting real-time and energy consumption constraints. With the increase in the design complexity of MPSoC architectures that must support these constraints, flexible and accurate simulators become a necessity for exploring the vast design space solutions. In this paper, we present an asymmetric MPSoC simulator environment, named SESAM. this tool can be used for the architecture exploration and optimization, and the design of a complete MPSoC solution for dynamic application processing. Its performances and capabilities are demonstrated through a complete MPSoC platform and an implementation of the component labeling algorithm.

关键词： Computer architecture Computational modeling Program processors Dynamic scheduling Processor scheduling Hardware Resource management

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Resource management for enhancing predictability in systems with limited processing capabilities

Resource management for enhancing predictability in systems ...

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international conference on Emerging Technologies and Factory Automation (ETFA)

作者： Alejandro Alonso Emilio Salazar Jorge López Dept. Ingeniería de Sistemas Telemáticos Universidad Politécnica de Madrid Spain Dept. Arquitectura y Tecnología de Sistemas Informáticos Universidad Politécnica de Madrid Spain

there is an increasing demand for computing systems composed by heterogeneous computers, connected by different types of networks, and that allow for accessing a wide range of services in a seamless way. Some of those computers are mobile or embedded and have limited resources, and can be overloaded when trying to handle their users demands. then it is not possible to ensure a proper behaviour of the running applications. this can be an important problem when dealing with critical events in healthcare, home surveillance, or forest monitoring. Resource reservation is a valid basis for handling this issue. It allows for guaranteeing a certain resource share for applications that are important for the proper behavior of a given system. this paper describes an implementation of a resource management component and its integration in the Linux kernel. this piece of software has allowed to assign CPU budgets to standard Java threads, which is an important facility, given the widespread of this programming language. this implementation has been validated on service oriented middleware, where relevant services are executed by thread with guaranteed budget, to improve its predictability.

关键词： Linux real time systems Kernel Java Instruction sets Resource management Safety

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***: An open data exchange for the web of things

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ieee Annual conference on Pervasive computing and Communications Workshops (PerCom)

作者： Vipul Gupta Arshan Poursohi Poornaprajna Udupi Sun MicroSystems Laboratories Inc. Menlo Park CA USA

Tiny, wireless, sensors embedded in a large number of Internet-capable devices-smart phones, cameras, cars, toys, medical instruments, home appliances and energy meters-can generate an enormous volume of small bits of data such as temperature and humidity readings, GPS co-ordinates and energy usage. the real value of this data lies in its analysis, which can lead to significant insights and actions that enhance the health of our planet and its populations. We have developed a web-based infrastructure called *** for storing, sharing, searching, visualizing and analyzing data from heterogeneous devices and facilitating easy interaction amongst devices and end users through an open, REST-based API. this demonstration starts off with a brief walkthrough of the *** portal as we describe its data abstractions, APIs and different views, e.g. dashboard view for monitoring the health of different sensor datastreams and their access permissions and map view for geographical search. Next we show the platform's visualization capabilities, in particular LivePlots-interactive plots of different types which can be embedded into web-based applications hosted elsewhere and are rendered using the latest data from our service each time that external webpage is reloaded. We discuss data-centric collaborations and social interactions made possible by features such as tagging, searching and sharing with fine-grained privacy controls. We demonstrate notifications that are automatically generated when sensor data meeting user-specified criteria is inserted. these notifications allow the composition of ?mashups? of heterogeneous sensors and actuators (e.g. a humidity sensor from one vendor controlling a sprinkler system from another). Finally, we present our early explorations into reprogramming and remote management of devices.

关键词： Temperature sensors Humidity Data visualization Automatic control Sensor systems Wireless sensor networks Internet Cameras Instruments Home appliances

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Legacy real-time applications in a Reservation-Based System

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ieee TRANSACTIONS ON INDUSTRIAL INFORMATICS 2009年第3期5卷 220-228页

作者： Palopoli, Luigi Abeni, Luca Univ Trent I-38050 Trento Italy

A remarkable research activity has been carried out in the past few years to support real-time applications with appropriate scheduling solutions. Unfortunately, most of such techniques can be used only if real-time applications use a specialized API, and if some important information (such as the worst-case execution-time) are known a priori. In this paper, we present a novel technique, the Legacy Feedback Scheduler (LFS), for a class of legacy applications that need the support of a real-time scheduler but are not written using a specialized API and have unknown or varying execution requirements. the approach is based on the combination of a resource reservation scheduler and a feedback-based adaptation mechanism for identifying the correct scheduling parameters.

关键词： embedded control quality-of-service (QoS) real-time computing

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Accounting for Interrupts in Multiprocessor real-time systems

Accounting for Interrupts in Multiprocessor Real-Time System...

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15th ieee international conference on embedded and real-time computing systems and applications

作者： Brandenburg, Bjoern B. Leontyev, Hennadiy Anderson, James H. Univ N Carolina Chapel Hill NC 27515 USA

the importance of accounting for interrupts in multiprocessor real-time schedulability analsysis is discussed: three interrupt accounting methods, two of which are newly described here, are analyzed and compared.

ISBN: (纸本)9780769537870

关键词： real time systems

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