The real time embedded systems (RTES) project was created to study the design and implementation of high-performance, heterogeneous, and fault-adaptive real time embedded systems. The driving application for this rese...
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The real time embedded systems (RTES) project was created to study the design and implementation of high-performance, heterogeneous, and fault-adaptive real time embedded systems. The driving application for this research was the proposed BTeV high energy physics experiment, which called for large farms of embedded computational elements (DSPs), as well as a large farm of conventional high-performance processors to implement its Level 1 and Level 2/3 triggers. At the time of BTeV's termination early in 2005, the RTES project was within days of completing a prototype implementation for providing a reliable and fault-adaptive infrastructure to the L2/3 farm; a prototype for the L1 farm had been completed in 2003. This paper documents the conclusion of the RTES focus on BTeV, and provides an evaluation of the applicability of the RTES concepts to other systems
Web search engines are very useful information service tools in the Internet. The current web search engines produce search results relating to the search terms and the actual information collected by them. Since the ...
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Web search engines are very useful information service tools in the Internet. The current web search engines produce search results relating to the search terms and the actual information collected by them. Since the selections of the search results cannot affect the future ones, they may not cover most people’s interests. In this paper, feedback information produced by the user’s accessing lists will be represented by the rough set and can reconstruct the query string and influence the search results. And thus the search engines can provide self-adaptability.
Key words WWW - search engine - query reconstruction - feedback
CLC number TP 311. 135.4
Foundation item: Supported by the National Natural Science Fundation of China (60373066). National Grand Fundamental Research 973 Program of China (2002CB31200). Opening Foundation of State Key laboratory of softwareengineering in Wuhan University, Opening Foundation of Jiangsu Key laboratory of computer Information Processing Technology in Soochow University
Biography: ZHANG Wei-feng (1975-), male, Ph.D. research direction: artificial intelligence, search engine, data mining, network language.
software frequently needs to adapt its behavior at run time to respond to changes in its execution environment. Different software components may use different approaches to adaptation. Composing a single adaptive sys...
ISBN:
(纸本)1581139497
software frequently needs to adapt its behavior at run time to respond to changes in its execution environment. Different software components may use different approaches to adaptation. Composing a single adaptive system from existing adaptive components requires an "adaptation infrastructure" to integrate and arbitrate adaptive behaviors. This paper proposes a model for such an infrastructure and describes the design and operation of M2, a prototype implementation. M2 uses a technique called transparent shaping to modify existing components so that they can report events of interest to the M2 core and implement appropriate responses. The architecture and communication infrastructure of M2 are described, followed by a case study in which M2 is used to construct an adaptive multimedia conferencing application from otherwise incompatible components. Copyright 2004 ACM.
A number of testing strategies have been proposed using state machines and statecharts as test models in order to derive test sequences and validate classes or class clusters. Though such criteria have the advantage o...
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ISBN:
(纸本)9780769521633
A number of testing strategies have been proposed using state machines and statecharts as test models in order to derive test sequences and validate classes or class clusters. Though such criteria have the advantage of being systematic, little is known on how cost effective they are and how they compare to each other. This article presents a precise simulation and analysis procedure to analyze the cost-effectiveness of statechart-based testing techniques. We then investigate, using this procedure, the cost and fault detection effectiveness of adequate test sets for the most referenced coverage criteria for statecharts on three different representative case studies. Through the analysis of common results and differences across studies, we attempt to draw more general conclusions regarding the costs and benefits of using the criteria under investigation.
We conducted an eye-tracking study of mechanical problem solving from cross-sectional diagrams of devices. Response time, accuracy and eye movement data were collected and analyzed for 72 problem-solving episodes (9 s...
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In this paper, we consider a new atomicity model, write all with collision (WAC), and compare it with existing models considered in the literature. This model captures the computations in sensor networks. We show that...
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The behavior and performance of MPI non-blocking message passing operations are sensitive to implementation specifics as they are heavily dependant on available system level buffers. In this paper we investigate the b...
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Program slicing is widely used in applications such as program comprehension, software testing, debugging, measurement, and re-engineering. This paper proposes a new approach for program slicing, called modular monadi...
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The object constraint language (OCL) was introduced as part of the Unified Modeling Language (UML). Its main purpose is to make UML models more precise by providing a constraint language. For example, operation contra...
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The object constraint language (OCL) was introduced as part of the Unified Modeling Language (UML). Its main purpose is to make UML models more precise by providing a constraint language. For example, operation contracts and statechart guard conditions can be precisely defined using OCL. There has been an ongoing debate on the usefulness of using OCL in UML-based development, questioning whether the additional effort and formality were worth the benefit. This work presents the results of a controlled experiment that investigates the impact of using OCL on model comprehension and maintainability. Current results show that, once past an initial learning curve, significant benefits can be obtained by using OCL in combination with UML diagrams.
Peer-to-Peer (P2P) computing is said to be the next wave of computing after client-server and web-based computing. It provides an opportunity to harness a lot of idle peer-resources such as desktop computers across th...
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