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ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Dong-In Kang Stephen P. Crago Jinwoo Suh Janice McMahon Information Sciences Institute University of Southern California USA

We consider a resource synthesis technique for realtime systems where dynamic voltage scaling is supported, the energy budget is limited, and the performance of the system depends on how resources and energy are used. We propose a resource synthesis technique that derives both the supply voltages and the resource allocation of the tasks in the system to maximize system performance. the resulting system satisfies real-time schedulability and energy requirements.

关键词： real time systems Dynamic voltage scaling Resource management System performance Energy consumption Processor scheduling Frequency Iris Computational modeling Control system synthesis

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Code Size Optimization for embedded Processors using Commutative Transformations

Code Size Optimization for Embedded Processors using Commuta...

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ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Sai Pinnepalli Jinpyo Hong J. Ramanujam Doris L. Carver Louisiana State University USA Korea University of Technology and Education South Korea

Code optimization of the offset assignment generated in embedded systems allows for power and space efficient systems. We propose a new heuristic that uses edge classification to commutatively transformation and optimize the assignment. We introduce concept of breakable and unbreakable edges, which assists in selecting edges for path cover and edges for commutative transformation.

关键词： Commutation Semiconductor optical amplifiers Space technology Registers Costs Programming profession Arithmetic Educational technology Distributed power generation Power generation

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Tardiness Bounds for EDF Scheduling on Multi-Speed Multicore Platforms

Tardiness Bounds for EDF Scheduling on Multi-Speed Multicore...

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ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Hennadiy Leontyev James H. Anderson Department of Computer Science North Carolina State University Chapel Hill USA

Multicore platforms, which include several processing cores on a single chip, are being widely touted as a solution to heat and energy problems that are impediments to single-core chip designs. To accommodate both parallelizable and inherently-sequential applications on the same platform, heterogeneous multicore designs with faster and slower cores have been proposed. In this paper, we consider the problem of scheduling soft real-time workloads on such a platform.

关键词： Multicore processing real time systems Scheduling algorithm Processor scheduling Timing Delay Job shop scheduling Chip scale packaging Streaming media throughput

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Priority-driven coding and transmission of progressive JPEG images for real-time applications

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Journal of VLSI Signal Processing systems for Signal, Image, and Video Technology 2007年第2期47卷 169-182页

作者： Cheng, Albert Mo Kim Shang, Feng Real-Time Systems Laboratory Department of Computer Science University of Houston Houston TX 77204-3010 United States

Since high-quality image/video systems based on the JPEG/MPEG compression standards often require power-expensive implementations at relatively high bit-rates, they have not been widely used in low-power wireless applications. To alleviate this problem, we designed, implemented, and evaluated a strategy that can adapt to different compression and transmission rates. (1) It gives important parts of an image higher priority over unimportant parts. therefore, the high-priority parts can achieve high image quality, while the low-priority parts, with a slight sacrifice of quality, can achieve huge compression rate and thus save the power/energy of a low-power wireless system. (2) We also introduce a priority-driven scheduling approach into our coding algorithm, which makes the transmission of important parts earlier with more data than other parts. through a balanced trade-off between the available time/bandwidth/power and the image quality, this adaptive strategy can satisfy users with desired images quality and lead to a significant reduction of the important parts' deadline misses. © Springer Science+Business Media, LLC 2007.

关键词： Image coding

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On a ieee 802.15.4/ZigBee to ieee 802.11 gateway for the ART-WiSe architecture

On a IEEE 802.15.4/ZigBee to IEEE 802.11 gateway for the ART...

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12th ieee international conference on Emerging Technologies and Factory Automation

作者： Leal, Joao Cunha, Andre Alves, Mario Koubaa, Anis Polytech Inst Porto Sch Engn Oporto Portugal Al Imam Muhammad Ibn Saud Univ Dept Commun Sci Riyadh 11681 Saudi Arabia

ISBN: (纸本)9781424408269

Wireless Sensor Networks (WSN) have been attracting growing interests for developing a new generation Of large-scale embedded computing systems, with a great potential for a wide range of applications such as surveillance, environmental monitoring, emergency medical response or building automation. However, the communication paradigms in wireless sensor networks differ from the ones associated to traditional wireless networks, triggering the need for new communication protocols and architectures. the ART-WiSe (Architecture for real-time communications in Wireless Sensor Networks) framework aims at the design of a scalable multiple-tiered WSN architecture for supporting large-scale embedded computing applications with critical requirements. An overlay Wireless Local Area Network (Tier-2) serves as a backbone for a WSN (Tier 1), relying on existing standard communication protocols and commercial-off-the-shell (COTS) technologies ieee 802.15.4/ZigBee for Tier I and ieee 802. 11 for Tier-2. this paper outlines ongoing work on the design of the architectural requirements and features for a QoS-aware gateway between both networks.

关键词： Wireless sensor networks

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An Approach to the Timing Analysis of Hierarchical systems

An Approach to the Timing Analysis of Hierarchical Systems

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ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Marco Panunzio Tullio Vardanega Department of Pure and Applied Mathematics University of Padua Paduna Italy

Two architectural paradigms for the development of hierarchical systems arguably stand out for their flexibility and ease of reconfiguration: the server-based architecture and the priority-band architecture. Whilst the former has been deeply investigated, the latter, a fresh addition to a mainstream programming language standard, still lacks an accurate study of its timing behaviour. In this paper we relate those two architectural paradigms and devise timing analysis equations for the priority-band systems off the solid roots of the server-based theory.

关键词： Timing Hierarchical systems Computer architecture real time systems Sensitivity analysis Predictive models Performance analysis Mathematics Computer languages Failure analysis

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Towards an Automated Test Generation with Delayed Transitions for timed systems

Towards an Automated Test Generation with Delayed Transition...

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ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Elisangela Rodrigues Vieira Ana Cavalli GET/INT Laboratoire SAMOVAR (CNRS) Evry France

In this paper we analyze the influence of the urgency in the timed transitions, and as consequence, in the test suite generation. As result, we formalize rules to generate sequences where the messages exchanged may be instantaneous or delayed. In addition, the generated scenarios are able to detect timing faults. For test generation, we use a prototype tool called HJ2IF. It is based on a test purpose algorithm, called hit-or-jump and it is applied for systems specified using Intermediate Format language (IF).

关键词： Automatic testing System testing time factors Automata Fault detection Timing real time systems Automatic control Delay effects Prototypes

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Energy-Efficient Scheduling for real-time systems on Dynamic Voltage Scaling (DVS) Platforms

Energy-Efficient Scheduling for Real-Time Systems on Dynamic...

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ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Jian-Jia Chen Chin-Fu Kuo Department of Computer Science and Information Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National University of Kaohsiung Taiwan

Energy-efficient designs have played import roles for hardware and software implementations for a decade. With the advanced technology of VLSI circuit designs, energy-efficiency can be achieved by adopting the dynamic voltage scaling (DVS) technique. In this paper, we survey the studies for energy-efficient scheduling in real-time systems on DVS platforms to cover both theoretical and practical issues.

关键词： Energy efficiency Dynamic scheduling real time systems Dynamic voltage scaling Voltage control Energy consumption Processor scheduling Computer science Design engineering Power engineering and energy

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Reliability issues in deep deep sub-micron technologies: time-dependent variability and its impact on embedded system design

Reliability issues in deep deep sub-micron technologies: Tim...

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IOLTS 2007 13th ieee international On-Line Testing Symposium

作者： Papanikolaou, Antonis Wang, Hua Miranda, Miguel Catthoor, Francky IMEC V.Z.W. Kapeldreef 75 3001 Leuven Belgium

ISBN: (纸本)0769529186

embedded system design is especially demanding in terms of requirements that need to be satisfied, e.g. real-time processing, cost effectiveness, low energy consumption and reliable operation. these requirements have to be properly balanced until a financially viable global solution is found. Novel mobile multimedia and communication applications pose extremely severe requirements on the amount of storage, processing and functionality capabilities of the system. Near future embedded systems will have to combine interactive gaming with advanced 3D and video codecs together with leading edge wireless connectivity standards, like software defined radio front-ends and protocol stacks for cognitive radio. this will increase the platform requirements by at least a factor of 10. Meanwhile, battery capacity is only increasing by about 7% per year and users demand longer times between battery recharges. Optimizing any one of these requirements by compromising on another is a rather straightforward design task. In embedded system design the solution must obey the constraints in all four requirement axes. © 2007 ieee.

关键词： Cost effectiveness

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Analyzing Access Timing of Removable Flash Media

Analyzing Access Timing of Removable Flash Media

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ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Daniel Parthey Robert Baumgartl Real-Time Research Group Department of Computer Science Chemnitz University of Technology Germany

Flash memories could be a basis for mass storage with real-time guarantees if a suitable model for access timing could be established. We describe Flanatoo, a suite of benchmarks which extracts relevant timing information from removable flash media such as compact flash (CF) and USB flash drives. We identified three major timing influence factors: the access block size, the accessed address and (to a lesser degree) the written bit pattern. Despite numerous timing anomalies we argue that removable flash media behave more predictably than hard disks and are indeed a potential basis for real-time mass storage.

关键词： Timing Flash memory Hard disks File systems real time systems Data mining Universal Serial Bus Microcontrollers Computer science Chemical technology

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