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2011 17th IEEE Real-Time and Embedded Technology and Applications Symposium

11-14 April 2011

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  • [Front cover]

    Publication Year: 2011, Page(s): C1
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  • [Title page i]

    Publication Year: 2011, Page(s): i
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  • [Title page iii]

    Publication Year: 2011, Page(s): iii
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  • [Copyright notice]

    Publication Year: 2011, Page(s): iv
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  • Table of contents

    Publication Year: 2011, Page(s):v - viii
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  • Message from the Program Chair

    Publication Year: 2011, Page(s): ix
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  • Conference organizers

    Publication Year: 2011, Page(s): x
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  • Technical Program Committees

    Publication Year: 2011, Page(s):xi - xii
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  • Reviewers

    Publication Year: 2011, Page(s):xiii - xiv
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  • Reliable and Real-Time Communication in Industrial Wireless Mesh Networks

    Publication Year: 2011, Page(s):3 - 12
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (567 KB) | HTML iconHTML

    Industrial wireless mesh networks are deployed in harsh and noisy environments for process measurement and control applications. Compared with wireless community networks, they have more stringent requirements on communication reliability and real-time performance. Missing or delaying of the process data by the network may severely degrade the overall control performance. In this paper, we abstrac... View full abstract»

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  • End-to-End Delay Analysis for Fixed Priority Scheduling in WirelessHART Networks

    Publication Year: 2011, Page(s):13 - 22
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1060 KB) | HTML iconHTML

    The WirelessHART standard has been specifically designed for real-time communication between sensor and actuator devices for industrial process monitoring and control. End-to-end communication delay analysis for WirelessHART networks is required for acceptance test of real-time data flows from sensors to actuators and for workload adjustment in response to network dynamics. In this paper, we map t... View full abstract»

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  • RAD-FLOWS: Buffering for Predictable Communication

    Publication Year: 2011, Page(s):23 - 33
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (399 KB) | HTML iconHTML

    Real-time systems and applications are becoming increasingly complex and often comprise multiple communicating tasks. The management of the individual tasks is well-understood, but the interaction of communicating tasks with different timing characteristics is less well-understood. We discuss several representative inter-task communication flows via reserved memory buffers (possibly interconnected... View full abstract»

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  • Multi-moded Resource Reservations

    Publication Year: 2011, Page(s):37 - 46
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (286 KB) | HTML iconHTML

    Often real-time systems can run in different modes depending on the external environment or their internal state. Each operational mode is characterized by a set of tasks with different computational demand, resource requirements, and resource availability. When resource reservation is used to achieve temporal isolation among applications, the reservation parameters may need to change from mode to... View full abstract»

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  • Mixed-Criticality Task Synchronization in Zero-Slack Scheduling

    Publication Year: 2011, Page(s):47 - 56
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB) | HTML iconHTML

    Recent years have seen an increasing interest in the scheduling of mixed-criticality real-time systems. These systems are composed of groups of tasks with different levels of criticality deployed over the same processor(s). Such systems must be able to accommodate additional execution-time requirements that may occasionally be needed. When overload conditions develop, critical tasks must still mee... View full abstract»

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  • Near-Optimal Constant-Time Admission Control for DM Tasks via Non-uniform Approximations

    Publication Year: 2011, Page(s):57 - 67
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (621 KB) | HTML iconHTML

    Admission control decisions involve determining whether a new task can be accepted by a running system such that the new task and the already running tasks all meet their deadlines. Since such decisions need to be taken on-line, there is a strong interest in developing fast and yet accurate algorithms for different setups. In this paper, we propose a constant-time admission control test for tasks ... View full abstract»

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  • The Digraph Real-Time Task Model

    Publication Year: 2011, Page(s):71 - 80
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (485 KB) | HTML iconHTML

    Models for real-time systems have to balance the inherently contradicting goals of expressiveness and analysis efficiency. Current task models with tractable feasibility tests have limited expressiveness, restricting their ability to model many systems accurately. In particular, they are all recurrent, preventing the modeling of structures like mode switches, local loops, etc. In this paper, we ad... View full abstract»

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  • Removing Abstraction Overhead in the Composition of Hierarchical Real-Time Systems

    Publication Year: 2011, Page(s):81 - 90
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (381 KB) | HTML iconHTML

    The hierarchical real-time scheduling framework is a widely accepted model to facilitate the design and analysis of the increasingly complex real-time systems. Interface abstraction and composition are the key issues in the hierarchical scheduling framework analysis. Schedulability is essential to guarantee that the timing requirements of all components are satisfied. In order for the design to be... View full abstract»

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  • A Semantic Framework for Mode Change Protocols

    Publication Year: 2011, Page(s):91 - 100
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB) | HTML iconHTML

    We present a unified framework for the specification and analysis of mode-change protocols used in multi-mode real-time systems. We propose a highly expressive formalism, called MCP, to model the system behavior during mode transitions, and show how various existing mode change protocols can be described as MCPs. The explicit representation of the MCP model provides a means to analyze the system s... View full abstract»

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  • Deterministic and Stochastic QoS Provision for Real-Time Control Systems

    Publication Year: 2011, Page(s):103 - 112
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB) | HTML iconHTML

    In this paper, we propose two adaptive scheduling approaches to support real-time control applications with highly varying computation times. The use of a resource reservation scheduler enables the construction of a dynamic model describing the evolution of the computing delays, which can be incorporated in the system closed loop dynamics. The two approaches differ for the assumptions on the seque... View full abstract»

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  • Scheduling Analysis under Fault Bursts

    Publication Year: 2011, Page(s):113 - 122
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (286 KB) | HTML iconHTML

    Real time systems must respect their temporal constraints both in nominal and degraded conditions. Environment disturbances cause faults which are revealed by errors during task execution. Therefore, schedulers must be fault tolerant to guarantee no missed deadline. Phenomena like electromagnetic fields disturb real-time systems on an extended period of time. It is difficult to forecast faults and... View full abstract»

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  • EMI- and Energy-Aware Scheduling of Switching Power Supplies in Hard Real-Time Embedded Systems

    Publication Year: 2011, Page(s):123 - 133
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (569 KB) | HTML iconHTML

    In this paper we present the Make And Take(MAT) approach for adding switch-mode power supply (SMPS) control to hard real-time systems. MAT enables control of the SMPS with the task scheduler and this allows the designer to use a less expensive and smaller (but noisier) SMPS without it affecting circuits sensitive to electromagnetic interference (EMI) such as high-impedance input signals and amplif... View full abstract»

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  • Ultra Low Power Granular Decision Making Using Cross Correlation: Optimizing Bit Resolution for Template Matching

    Publication Year: 2011, Page(s):137 - 146
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB) | HTML iconHTML

    Advances in technology have led to development of wearable sensing, computing and communication devices that can be woven into the physical environment of our daily lives, enabling a large variety of new applications in several domains including wellness and health care. Despite their tremendous potential to impact our lives, wearable health monitoring systems face a number of hurdles to become a ... View full abstract»

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  • Cooperating Write Buffer Cache and Virtual Memory Management for Flash Memory Based Systems

    Publication Year: 2011, Page(s):147 - 156
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB) | HTML iconHTML

    Flash memory is becoming the storage media of choice for mobile devices and embedded systems. The performance of flash memory is impacted by the asymmetric speed of read and write operations, limited number of erase times and the absence of in-place updates. To improve the performance of flash memory based systems, write buffer cache has been equipped in flash memories recently. At the same time, ... View full abstract»

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  • A Two-Level Caching Mechanism for Demand-Based Page-Level Address Mapping in NAND Flash Memory Storage Systems

    Publication Year: 2011, Page(s):157 - 166
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB) | HTML iconHTML

    The increasing capacity of NAND flash memory leads to large RAM footprint on address mapping in the Flash Translation Layer (FTL) design. The demand-based approach can reduce the RAM footprint, but extra address translation overhead is also introduced which may degrade the system performance. This paper proposes a two-level caching mechanism to selectively cache the on-demand page-level address ma... View full abstract»

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  • Virtual-CPU Scheduling in the Quest Operating System

    Publication Year: 2011, Page(s):169 - 179
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB) | HTML iconHTML

    This paper describes the scheduling framework for a new operating system called "Quest". The three main goals of Quest are to ensure safety, predictability and efficiency of software execution. For this paper, we focus on one aspect of predictability, involving the integrated management of tasks and I/O events such as interrupts. Quest's scheduling infrastructure is based around the concept of a v... View full abstract»

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