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International Conference on software engineering (ICSE)

作者： A. van der Hoek D. Heimbigner A.L. Wolf Software Engineering Research Laboratory Department of Computer Science University of Colorado Boulder CO USA

Distributed configuration management is intended to support the activities of projects that span multiple sites. NUCM (Network-Unified Configuration Management) is a testbed that we are developing to help us explore the issues of distributed configuration management. NUCM separates configuration management repositories (i.e. the stores for versions of artifacts) from configuration management policies (i.e. the procedures by which the versions are manipulated) by providing a generic model of a distributed repository and an associated programmatic interface. This paper describes the model and the interface, presents an initial repository distribution mechanism, and sketches how NUCM can be used to implement two rather different configuration management policies, namely check-in/check-out and change sets.

关键词： Peer to peer computing Project management engineering management Laboratories Testing software systems software engineering computer science Contracts Government

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Corona: a communication service for scalable, reliable group collaboration systems 96

Corona: a communication service for scalable, reliable group...

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Proceedings of the 1996 ACM conference on computer supported cooperative work

作者： Robert W. Hall Amit Mathur Farnam Jahanian Atul Prakash Craig Rassmussen Software Systems Research Laboratory Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor MI

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Using object-oriented principles to optimize update propagation to materialized views

Using object-oriented principles to optimize update propagat...

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International Conference on Data engineering

作者： H.A. Kuno E.A. Rundensteiner Department of Elect. Engineering and Computer Science Software Systems Research Laboratory University of Michigan Ann Arbor MI USA

View materialization is known to be a valuable technique for performance optimization in relational databases, and much work has been done addressing the problem of consistently maintaining relational views under update operations. However, little progress has been made thus far regarding the topic of view materialization in object-oriented databases (OODBs). In this paper, we demonstrate that there are several significant differences between the relational and object-oriented paradigms that can be exploited when addressing the object-oriented view materialization problem. We use the subsumption relationships between classes to identify branches of classes to which we do not need to propagate updates. Similarly, we use encapsulated interfaces combined with the fact that any unique database property is inherited from a single location to provide a "registration/notification" service for optimizing incremental view updates. We also report results from the experimental studies we have run on the MultiView system measuring the impact of these optimization strategies.

关键词： Object oriented modeling Relational databases Object oriented databases computer science software systems Laboratories Optimization Programming profession NASA Prototypes

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Augmented inherited multi-index structure for maintenance of materialized path query views

Augmented inherited multi-index structure for maintenance of...

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International Workshop on Research Issues in Data engineering

作者： H.A. Kuno E.A. Rundensteiner Department of Elect. Engineering and Computer Science Software Systems Research Laboratory University of Michigan Ann Arbor MI USA

Materialized complex object-oriented views are a promising technique for the integration of heterogeneous databases and the development of powerful data warehousing systems. Path query views are virtual classes formed from selection queries that specify a predicate upon the value of an aggregation hierarchy path. The primary difference between previous work regarding OODB indexing and the efficient implementation of materialized path query views addressed in this paper lies in the nature of their usage. For OODB indexing, query usage is the primary purpose of index structures. Because the materialized view data itself can be used to answer queries, the primary use of index structures with regard to materialized path query views is for the incremental maintenance of views in the face of updates. We have developed an augmented inherited multi-index (AIM) strategy that is specifically tailored for the maintenance of materialized path query views. We find that we can improve update performance by augmenting traditional inherited multi-indices with structured representations of the path queries that use them. This enables us to use class hierarchy relationships to prune the number of aggregation paths that must be re-instantiated during update propagation and also to support complex path queries that include cycles.

关键词： Object oriented databases Warehousing Indexing Distributed databases Workflow management software computer science software systems Laboratories Information technology Database systems

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Consistent view removal in transparent schema evolution systems

Consistent view removal in transparent schema evolution syst...

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International Workshop on Research Issues in Data engineering

作者： V. Crestana-Taube E.A. Rundensteiner Department of Elect. Engineering and Computer Science Software Systems Research Laboratory University of Michigan Ann Arbor MI USA

We have developed the transparent schema evolution (TSE) system that, simulating schema evolution using object-oriented views, allows for the interoperability of applications with diverse and even changing requirements. TSE relieves users of the risk of making existing application programs obsolete when run against the modified schema, because the old view schema is maintained while a new view schema is generated to capture the changes desired by the user. However TSE may be generating a large number of schema versions (object-oriented view schemata) over time, resulting in an excessive build-up of classes and underlying object instances-some of which may potentially no longer be in use. We propose to solve this problem by developing techniques for effective and consistent schema removal. First, we characterize four potential problems of schema consistency that could be caused by removal of a single virtual class; and then outline our solution approach for each of these problems. Second, we demonstrate that view schema removal is sensitive to the order in which individual classes are processed. Our solution to this problem is the development of a dependency graph model for capturing the class relationships, used as a foundation for selecting among removal sequences. Designed to optimize the performance of the TSE system by effective schema version removal, the proposed techniques will enable more effective interoperability among evolving software applications.

关键词： Application software Object oriented modeling computer science software systems Laboratories Computational modeling Marine vehicles Design optimization software performance Veins

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ASPECT-an Architecture SPECification Technique a report on work in progress

ASPECT-an Architecture SPECification Technique a report on w...

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International Conference and Workshop on engineering of computer-Based Systems

作者： V. Kirova W. Rossak Department of Computer and Information Science Department of Computer and Information Science New Jersey Institute of Technology Newark NJ USA Department of Computer and Information Science Department of Computer and Information Science Software and Systems Engineering Laboratory New Jersey Institute of Technology Newark NJ USA

We discuss ASPECT, a first step towards a generic specification technique for software architectures. We present and discuss an abstract grammar for ASPECT that lists and relates to each other all the architectural elements that form ASPECT's vocabulary. After elaborating on the characteristics of these architectural elements, we illustrate their application in a small example.

关键词： computer architecture software systems Systems engineering and theory Laboratories software architecture Information science Open systems Costs Decision support systems Standardization

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Literate programming and documentation reuse

Literate programming and documentation reuse

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International Conference on software Reuse

作者： B. Childs J. Sametinger Department of Computer Science Texas A and M University TX USA Department of Computer Science Texas A and M University USA CD Laboratory for Software Engineering Johannes Kepler University Linz Linz Austria

Object-oriented programming has brought many advantages to the software engineering community. The reuse of existing software components and application frameworks can improve the productivity in software development considerably. The same object-oriented techniques, i.e., inheritance and information hiding, that ease reusing software, can be applied to documentation and thus, enable its reuse. One can document each software component-regardless of what a component is-from scratch. This leads to multiple documentation of features that are multiply reused. One can also describe a component's differences to other components. This seems logical for the systems documentation of object-oriented software. However, as is shown, this kind of reuse can not only be applied to source-code related documentation, but also to documentation, where there is no source code involved at all, e.g., user documentation. We describe the concepts for documentation reuse, how these concepts can be realized with a literate programming tool, and the application of documentation reuse.

关键词： Documentation Shape Object oriented programming Application software Programming profession computer science software engineering Productivity software maintenance software libraries

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A　COMBINED　TECHNIQUE　FOR　SOLUTION　OF　PDE＇s　VIA　THE　GENERALIZED　DOMAIN　DECOMPOSITION　METHOD

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Wuhan University Journal of Natural sciences 1996年第Z1期1卷 668-674页

作者： Guangming Lin Lishan Kang Yuping Chen Iain Macleod(Soft science department, Shenzhen University P.R.C.software engineering State Key laboratory Wuhan University, P.R.C.computer sciences laboratory The Australian National UniversityCanberra, ACT 0200, A Soft Science Department Shenzhen University P.R.C. Software Engineering State Key Laboratory Wuhan University P.R.C. Computer Sciences Laboratory The Australian National University Canberra Australia

The Domain Decomposition Method(DDM) is a powerful approach to solving maily types of PDE's. DDM is especially suitable for massively Parallel computers. In the past, most research on DDM has focused on the domain splitting technique. In this paper. we focus our attention on use of a combination of techniques to solve each subproblem. The central question with DDM is that of how to doal with the pseodoboundary conditions. Here, we introduce a set of operators which act on the pseudo-boundaries in the solution process, referring to this new. procedure as the 'Generalized Domain Decomposition ***(GDDM).' We have already obtained convergence factors for GDDM with certain classes of PDE's. These ctonvergence factors show that we can derive exact solutions of the whole problem for certain types of PDE's, and can get superior speed of convergence for other types.

关键词： Generalized Domain Decomposition Method Pseudo-Boundary Operator Convergence Factor,Combined Technique

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Data partition based reliability modeling

Data partition based reliability modeling

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International Symposium on software Reliability engineering (ISSRE)

作者： J. Tian J. Palma Department of Computer Science and Engineering Southern Methodist University Dallas TX USA IBM Software Solutions Toronto Laboratory North York ONT Canada

The paper presents an approach to software reliability modeling using data partitions derived from tree based models. We use these data sensitive partitions to group data into clusters with similar failure intensities. The series of data clusters associated with different time segments forms a piecewise linear model for the assessment and short term prediction of reliability. Long term prediction can be provided by the dual model that uses these grouped data as input fitted to some failure count variations of the traditional software reliability growth models. These partition based reliability models can be used effectively to measure and predict the reliability of software systems and can be readily integrated into our strategy of reliability assessment and improvement using tree based modeling.

关键词： software systems Predictive models Testing Application software Fluctuations Random variables computer science Data engineering Reliability engineering Piecewise linear techniques

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Exploratory analysis tools for tree-based models in software measurement and analysis

Exploratory analysis tools for tree-based models in software...

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International Symposium on Assessment of software Tools and Technologies

作者： J. Troster J. Tian IBM Software Solutions Toronto Laboratory North York ONT Canada Department of Computer Science and Engineering Southern Methodist University Dallas TX USA

The paper presents our experience with the adaptation and construction of exploratory analysis tools for tree-based models used in quality measurement and improvement. We extended a commercial off-the-shelf analysis tool to support visualization, presentation, and various other exploration functions. The user-oriented, interactive exploration of analysis results is supported by a new tool we constructed for this specific purpose. These tools have been used successfully in supporting software measurement and quality improvement for several large commercial software products developed in the IBM software Solutions Toronto laboratory.

关键词： software measurement software quality software tools Trademarks Predictive models Testing Laboratories Visualization software development management Programming

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