In this paper we present a new approach to distribute tasks connected by causal dependencies within a heterogeneous environment, e.g. several resources communicating with each other or a processor grid. Our approach u...
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In this paper we present a new approach to distribute tasks connected by causal dependencies within a heterogeneous environment, e.g. several resources communicating with each other or a processor grid. Our approach uses an artificial hormone system for task distribution which is able to meet real-time constraints. Several enhancements of the artificial hormone system are made such as partial suppressing of tasks and distributed task termination.
Today many embedded computer applications are developed under the assumptions that the hardware works always as described in the documentation, the operating system is free of design errors and the clients use the sys...
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ISBN:
(纸本)9780769531328
Today many embedded computer applications are developed under the assumptions that the hardware works always as described in the documentation, the operating system is free of design errors and the clients use the system as specified. these assumptions lead to systems that are fragile - they break if even a single transistor out of a billion transistors chip occasionally malfunctions or a sporadic Heisenbug [J. Gray, 1986] occurs in the operating system.
Wireless sensor networks (WSNs) play a crucial role in visual surveillance for automatic object detection, such as real-time traffic monitoring, vehicle parking control, intrusion detection, and so on. these online su...
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ISBN:
(纸本)9781605586182
Wireless sensor networks (WSNs) play a crucial role in visual surveillance for automatic object detection, such as real-time traffic monitoring, vehicle parking control, intrusion detection, and so on. these online surveillance applications require efficient computation and distribution of complex image data over the wireless camera network with high reliability and detection rate in realtime Traditionally, such applications make use of camera modules capturing a flow of two dimensional images through time. the resulting huge amount of image data impose severe requirements on the resource constrained WSN nodes which need to store, process and deliver the image data or results within a certain deadline In this paper we present a WSN framework based on line sensor architecture capable of capturing a continuous stream of temporal one dimensional image (line image) the associated one dimensional image processing algorithms are able to achieve significantly faster processing results with much less storage and bandwidth requirement while conserving the node energy. Moreover, the different operating modes offered by the proposed WSN framework provide the end user with different tradeoff in terms of node computation versus communication bandwidth efficiency Our framework is Illustrated through a testbed using ieee 802 154 communication stack and a real-time operating system along with one dimensional image processing the proposed line sensor based WSN architecture can also be a desirable solution to broader multimedia based WSN systems.
the time-triggered paradigm encompasses a set of concepts and principles that support the design of dependable real-time systems. By using the properties of physical time and the mechanism of clock synchronization, co...
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ISBN:
(纸本)9780769531328
the time-triggered paradigm encompasses a set of concepts and principles that support the design of dependable real-time systems. By using the properties of physical time and the mechanism of clock synchronization, coordinated interaction between distributed nodes can be facilitated. this paper briefly explains the time-triggered approach, defines a taxonomy for real-time requirements and discusses seven protocols that provide time-triggered features. Finally, two application examples are given that show the potential of the time-triggered approach.
this paper describes work to ease the resource allocation problem in the domain of game server hosting. A solution was sought that required no alteration to game server code and would not inhibit a player's gaming...
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ISBN:
(纸本)9780769531328
this paper describes work to ease the resource allocation problem in the domain of game server hosting. A solution was sought that required no alteration to game server code and would not inhibit a player's gaming experience. Although an academic work, the problem is tackled in a commercial setting.
General-purpose middleware must often be specialized for resource-constrained, real-time and embedded systems to improve their response-times, reliability, memory footprint, and even power consumption. Software engine...
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General-purpose middleware must often be specialized for resource-constrained, real-time and embedded systems to improve their response-times, reliability, memory footprint, and even power consumption. Software engineering techniques, such as aspect-oriented programming (AOP), feature-oriented programming (FOP), and reflection make the specialization task simpler, albeit still requiring the system developer to manually identify the system invariants, and sources of performance and memory footprint bottlenecks that determine the required specializations. Specialization reuse is also hampered due to a lack of common taxonomy to document the recurring specializations. this paper presents the GeMS (Generative Middleware Specialization) framework to address these challenges. We present results of applying GeMS to a distributedreal-time and Embedded (DRE) system case study that depict a 21-35% reduction in footprint, and a 3̃6% improvement in performance while simultaneously alleviating 9̃7% of the developer efforts in specializing middleware.
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