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49 篇 会议

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检索条件"任意字段=3rd IEEE Symposium on Application-Specific Systems and Software Engineering Technology, ASSET 2000"

共 49 条记录，以下是21-30 订阅

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How to manage real-time transactions in non-strict context 3

How to manage real-time transactions in non-strict context

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3rd ieee symposium on application-specific systems and software engineering technology

作者： Saad-Bouzefrane, S Sadeg, B Univ Havre LIH F-76058 Le Havre France

ISBN: (纸本)0769505597

Real-Time Database Management systems (DBMSs) attempt to reach the double objective of maintaining both database logical and temporal consistency while attempting to enhance concurrency in transaction execution. This objective being difficult to reach and since some real-time applications need not to hardly respect this objective, some proposed work attempts to bring new concepts for relaxing transactions and/or data properties in real-time context, that might be respected in traditional DBMSs. According to data fluctuations and/or deadlines fluctuations there are some kinds of applications. In these applications, the key problem is to efficiently schedule real-time transactions that allow to manipulate inaccurate data and/or that have deadline overtaking. In this paper, we show that multimedia applications are the best candidate to the use of these notions which are tightly connected to eoS of these applications. And we propose transactions concurrency-control and scheduling protocols that allow to bound data imprecision while allowing some transactions' to execute beyond their deadlines by a bounded time quantity. These algorithms are based on the extended Earliest Deadline algorithm which cooperates with the transaction manager in order to deal with transactions concurrency control.

关键词： Concurrency control Concurrent computing Database systems Fluctuations Multimedia databases Pixel Protocols Real time systems Streaming media Transaction databases

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Analysis of a multi-layer fault-tolerant COTS architecture for deep space missions 3

Analysis of a multi-layer fault-tolerant COTS architecture f...

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3rd ieee symposium on application-specific systems and software engineering technology

作者： Chau, SN Alkalai, L Tai, AT CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0769505597

Fault-tolerant systems are traditionally divided into fault containment regions and custom logic is added to ensure the effects of a fault within a containment region would not propagate to the other regions. This technique may not be applicable in a commercial-off-the-shelf (COTS) based system. While COTS technology is attractive due to its low cost. they are nor developed with the same level of rigorous fault tolerance in mind. Furthermore, COTS suppliers usually have no interest to add any overhead or sacrifice performance to implement fault-tolerance for a narrow market of high reliability applications. To over come this shortcoming, Jet Propulsion Laboratory (JPL) has developed a multi-layer fault protection methodology to achieve high reliability ill COTS-based avionics systems. This methodology has been applied to the bus architecture that uses the COTS bus interface standards ieee 1394 and (IC)-C-2. This paper-first gives an overview of the multi-layer fault-protection design methodology for COTS-based mission-critical systems. Then the effectiveness of the methodology is analyzed in terms of coverage and cost. The results ale compared to the traditional custom designed system.

关键词： Aerospace electronics Costs Design methodology Fault tolerance Fault tolerant systems Laboratories Logic Mission critical systems Propulsion Protection

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Regressive model approach to the generation of test trajectories 3

Regressive model approach to the generation of test trajecto...

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3rd ieee symposium on application-specific systems and software engineering technology

作者： Taylor, BJ Cukic, B Inst Software Res Fairmont WV 26554 USA

ISBN: (纸本)0769505597

One aspect of system safety assurance is the application of large test sets. To aid in the development of test cases, researchers have investigated automated test generation systems which decrease the time and cost of acquiring new tests. Many automated systems currently exist, but few address the generation of trajectories of data. A trajectory is defined as a series of data points with each point relying upon the state of the system and previous point values. Examples of trajectories include an airplane's flight path ol data describing a nuclear reaction. This paper describes an original approach to test trajectory generation using statistical regression models. An existing small set of trajectories is utilized to build regressive models. Then, the independent variables of the model can be pel tui bed, providing the basis for the use of the regressive model in the generation of new trajectories. A case study has been conducted within the scope of testing the sensor failure detection, identification, and accommodation (SFDIA) flight control scheme. We report and evaluate the results of this case study.

关键词： Aerospace safety Automatic testing Control systems Costs Ear Electronic switching systems Identity-based encryption Process control Reactive power System testing

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A toolsuite for testing analysis of real-time Ada applications 3

A toolsuite for testing analysis of real-time Ada applicatio...

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3rd ieee symposium on application-specific systems and software engineering technology

作者： Lee, YH Byun, Y Xiao, J Goh, O Wong, WE Lee, A Univ Florida Gainesville FL 32611 USA

ISBN: (纸本)0769505597

software testing is one of the most expensive phases in the software life cycle. Even for the best commercial grade software, it seldom contains fewer than 100 faults pel million lines of code. These faults result in failures and costs for customers which software manufactures are motivated to avoid. It is not unusual for manufacturers to spend 40% or more of their software budgets on testing in an effort to eliminate these faults. Hence, it is very important to provide a solution, supported by tools, which not only can reduce the cost but also improve the quality. In this paper, we describe our effort in developing an Ada program instrumentation environment, Ada-PINE, for testing real-time Ada programs. This tool can help developers and testers in many ways such as determining how well the software has been tested, displaying the code that has not been executed, and improving the code coverage in the most effective way. It can also conduct test set minimization with respect to code coverage and select effective fault-revealing regression tests.

关键词： Costs Flow graphs Instruments Life testing NASA software maintenance software testing software tools Space shuttles Space technology

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Automating the development of pattern-oriented designs for application specific software systems 3

Automating the development of pattern-oriented designs for a...

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3rd ieee symposium on application-specific systems and software engineering technology

作者： Yacoub, SM Xue, HY Ammar, HH W Virginia Univ Dept Comp Sci & Elect Engn Morgantown WV 26506 USA

ISBN: (纸本)0769505597

Object-oriented design patterns are introduced to document good-quality reusable design practices. A design pattern abstracts a solution structure that is mostly described in terms of a set of collaborating classes or objects. Composing these designs structures to develop application-specific designs involves an integration process that glues patterns together. A tool-support for the integration process will expedite the design phase. Current OO modeling tools do not explicitly support patterns as architecture constructs with interfaces. In this paper, we report on a prototype tool that supports visual composition of design patterns. The tool is called the Pattern-Oriented Design (POD) tool. The POD tool can be used to develop application-specific pattern-oriented designs. It facilitates the process of integrating patterns at the arhitecture level using the notion of pattern interfaces. The tool supports three hierarchical traceable pattern-level design models, namely the Pattern-level view, the Pattern Interfaces view, and the Detailed Pattern-Level view. Current visual modeling tools do not explicitly support the concepts of pattern views and pattern interfaces. The proposed tool facilitates the process of designing applications using patterns as design components, it integrates with existing object-oriented modeling tools, and it provides a mechanism to trace patterns through various abstraction levels. We nse a feedback control framework as an illustrative example to show how the tool can be used to develop pattern-oriented designs for application-specific systems.

关键词： application software Collaboration Computer architecture Computer science Electrical capacitance tomography Feedback Process design Prototypes software systems User interfaces

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Practical software reuse

Practical software reuse

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ieee Workshop on application-specific software engineering Technolog (asset)

作者： W.B. Frakes Computer Science Department Virginia Polytechnic Institute and State University Falls Church USA

The article argues that software reuse is practical and ever evolving to accommodate programming with higher level assets and to allow more direct modeling of domains. It is concluded that there is a lot of industrial data that shows that reuse can significantly improve software quality and productivity (W. Lim, 1998). Reuse is part of the process by which programming is done with larger and larger units and with more domain specificity.

关键词： Libraries Programming profession Humans Computer languages Assembly Functional programming Computer science software engineering Algorithms Filters

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A survivability assessment tool for restorable networks

A survivability assessment tool for restorable networks

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ieee Workshop on application-specific software engineering Technolog (asset)

作者： H.C. Cankaya V.S.S. Nair Department of Computer Science and Engineering Southern Methodist University Dallas TX USA

A parametric state reward Markov model (SRMM/p) has been developed for the survivability assessment of restorable SONET networks. Based upon this model, we developed a tool to evaluate reliability, availability and transient and steady-state restorability of such networks. In addition to providing some details of the implementations of the tool, we show some numerical examples in order to illustrate the usage of it.

关键词： Availability SONET Steady-state Network topology Computer science High-speed networks Protection Context-aware services Failure analysis Mesh networks

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A case study of a reusable component collection

A case study of a reusable component collection

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ieee Workshop on application-specific software engineering Technolog (asset)

作者： W.B. Frakes Computer Science Department Virginia Polytechnic Institute and State University Falls Church USA

software reuse is the use of existing software knowledge or artifacts to build new software. There are many types of software reuse (W. Frakes and C. Terry, 1996). The reuse described in the paper is ad-hoc, black box, compositional, code reuse. Ad hoc means that the reuse is not part of a repeatable mandated organizational process. The paper is concerned with code from a book on data structures and algorithms for information retrieval (IR) systems (W. Frakes and R. Baeza-Yates, 1992). Information retrieval systems retrieve textual documents from a database in response to queries submitted to the system by users.

关键词： Computer aided software engineering Information retrieval Books Thesauri Computer science software systems Humans Programming profession software reusability Data structures

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COTS integration: essential for network engineering

COTS integration: essential for network engineering

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ieee Workshop on application-specific software engineering Technolog (asset)

作者： S. Palangala S. Bhattacharya Computer Science and Engineering Department Arizona State University Tempe AZ USA

Our research aims at improving system level quality of a network by introducing a network engineering (NE) process framework. NE advocates a life cycle, process framework for network design, development, operations and maintenance, as a parallel to the software and systems engineering life cycle. NE was introduced with the spirit of improving the QoN, which is a related but orthogonal R&D area to the existing QoS R&D efforts. QoN is defined as the ability of an information technology (IT) system to meet user expectations by providing the intended functionality or desired information in a reliable, predictable and timely fashion. Our current research in NE has resulted in the development of the preliminary version of the Network Maturity Model (NMM) (http://***). The NMM is a qualitative and predictive model to evaluate the QoN for network systems. NMM also allows for an NE process to evolve with predictable cost-benefit tradeoff.

关键词： software maintenance software systems Design engineering systems engineering and theory Information technology Predictive models

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Design reuse and scale: keys to practical code generation and large scale software maintenance

Design reuse and scale: keys to practical code generation an...

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ieee Workshop on application-specific software engineering Technolog (asset)

作者： I.D. Baxter Semantic Designs Inc.

We advocate the reuse of design knowledge rather than code as the most effective means for obtaining productivity and quality improvements in software engineering activities. This knowledge comes in several forms; domain analysis, generative knowledge, and knowledge of the structure of a particular system in terms of the domain and how domain concepts are implemented. We are building and using a practical large-scale software (re)engineering tool, the Design Maintenance System (DMS) that implements these ideas. Reusing design knowledge, DMS is able to automate many interesting engineering activities: analysis, reverse engineering, forward synthesis, and eventually software maintenance via design maintenance. Code reuse methods are incapable of providing strong support for these activities. However, many issues involved in DMS construction are driven by the scale of the problem; number of languages, sheer code volume, amount of knowledge involved, and computational energy required.

关键词： software maintenance Productivity software engineering Buildings Large-scale systems software tools Design engineering Knowledge engineering Reverse engineering software design

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