this paper presents a simulation platfomi that has been realised in Java 1.1 for the study of behaviour and evolutionary processes in non-linear systems. To support the modelling of such systems, we propose the use of...
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In this paper we present a scheduler suitable to be applied to a particular class of dynamic systems, which main characteristics are the lack of actual data during long time periods and the unreliability on the availa...
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We present a practical method for coordinating two robots that have to move in close proximity. Few results have been reported in the literature for practical situations under time constraints. In addition, no previou...
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We consider the problem of designing an optimal control for linear discrete-timesystems assuming that total cost for the control efforts is limited and cost function is periodic in behaviour. (seasonal, for example) ...
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Supervision of power distribution systems is a major concern for electricity distributors. It consists in analysing alarms emitted by the devices, detecting permanent faults, locating these faults and reconfiguring th...
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the objective of this paper is to develop a high performance access mechanism for real-time memory-resident database systems. real-timesystems have very important properties: timeliness and predictability. In convent...
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ISBN:
(纸本)081869209X
the objective of this paper is to develop a high performance access mechanism for real-time memory-resident database systems. real-timesystems have very important properties: timeliness and predictability. In conventional database systems, hashing is known faster than tree access mechanism on the simple searches. Hence, on some environments, hash can be more appropriate to the real-timeapplications. On the other hand, tree index mechanism, it is possible to search to a range of specific data. Depending on the distance of a node in the tree, however, each access time to a node in the tree is different. this feature is not desirable for real-time database application, which requires deterministic data access behavior. In this paper, we present a new combined access mechanism called Hybrid Tree-Hash (Hybrid-th) mechanism. this mechanism is a complementary integration of tree-index and hash-index structure assuring that a Worst-Case Execution time is bounded within a specific time, especially, when range search operation works. Our analysis shows that Hybrid-th provides the predictability of data access operation in real-time memory-resident database systems (DBMS).
For many real-timeapplications, parallel computers offer a natural computing platform. However, very little attention has been paid to software support for real-timeembeddedsystems on parallel machines. this paper ...
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For many real-timeapplications, parallel computers offer a natural computing platform. However, very little attention has been paid to software support for real-timeembeddedsystems on parallel machines. this paper addresses the problem of formal software specification for parallel real-timesystems, and presents some features of a formal specification language - PRETSEL (Parallel real-time SpEcification Language). the syntax of PRETSEL is presented and the formal semantic rules are defined. the effectiveness of PRETSEL is demonstrated through the specification of the functionality and timing requirements of a Sonar system.
Sanders is integrating emerging interconnect technologies with other high-performance computing technologies to meet the demanding requirements of future, real-time, embedded military applications. Myrinet, a switched...
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ISBN:
(纸本)0818681861
Sanders is integrating emerging interconnect technologies with other high-performance computing technologies to meet the demanding requirements of future, real-time, embedded military applications. Myrinet, a switched network, is used to connect heterogeneous compute nodes in a low-latency, high-throughput System Area Network (SAN). Myrinet includes a standardized intelligent, node-to-network interface, called a LANai, which isolates each node from the network. Types of nodes under development include Digital Signal Processor (DSP), Reduced instruction Set computing (RISC), and Reconfigurable computing (RC). Modeling and simulation of the computing system are performed within the Ptolemy environment. High Density interconnect (HDI) packaging reduces Size, Weight And Power (SWAP), a requirement especially important for avionics applications. PacketWay, an Internet Engineering Task Force (IETF) proposed standard, provides a high-performance interface between heterogeneous SANs, and includes an option for highspeed inter-SAN encryption. A prototype high-performance scalable computer is being built at Sanders withthis set of technologies, to meet the requirements of several future military programs.
the proceedings contain 18 papers. the special focus in this conference is on Modeling Techniques and Tools for Computer Performance Evaluation. the topics include: A performability modeling environment tool;dependabi...
ISBN:
(纸本)9783540631019
the proceedings contain 18 papers. the special focus in this conference is on Modeling Techniques and Tools for Computer Performance Evaluation. the topics include: A performability modeling environment tool;dependability evaluation and the optimization of performability;design and implementation of a network computing platform using JAVA;storage alternatives for large structured state spaces;an efficient disk-based tool for solving very large markov models;efficient transient overload tests for real-timesystems;towards an analytical tool for performance modeling of ATM networks by decomposition;an embedded network simulator to support network protocols’ development;synchronized two-way voice simulation for internet phone performance analysis and evaluation;processes as language-oriented building blocks of stochastic petri nets;measurement tools and modeling techniques for evaluating WEB server performance;workload characterization of input/output intensive parallel applications;interval based workload characterization for distributed systems;bounding the loss rates in a multistage ATM switch;simple bounds for queues fed by markovian sources and on queue length moments in fork and join queuing networks with general service times.
In many real world tasks, only a small fraction of the available inputs are important at any particular time. this paper presents a method for ascertaining the relevance of inputs by exploiting temporal coherence and ...
In many real world tasks, only a small fraction of the available inputs are important at any particular time. this paper presents a method for ascertaining the relevance of inputs by exploiting temporal coherence and predictability. the method proposed in this paper dynamically allocates relevance to inputs by using expectations of their future values. As a model of the task is learned, the model is simultaneously extended to create task-specific predictions of the future values of inputs. Inputs which are either not relevant, and therefore not accounted for in the model, or those which contain noise, will not be predicted accurately. these inputs can be de-emphasized, and, in turn, a new, improved, model of the task created. the techniques presented in this paper have yielded significant improvements for the vision-based autonomous control of a land vehicle, vision-based hand tracking in cluttered scenes, and the detection of faults in the etching of semiconductor wafers.
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