Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96

9-10 Sept. 1996

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  • Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96

    Publication Year: 1996
    Request permission for commercial reuse | PDF file iconPDF (131 KB)
    Freely Available from IEEE
  • New metaphors for a visual query language

    Publication Year: 1996, Page(s):229 - 236
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    Metaphors have been proved useful in facilitating learning and using an operating system or various other tools. The paper shows, through the VISTA(*) query language, the benefits of using metaphors in the field of database querying by end users. Within VISTA, metaphors help in visualizing concepts of the object-oriented semantic data model and in facilitating the expression of operatio... View full abstract»

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  • Classifying software process models based on natural language descriptions

    Publication Year: 1996, Page(s):320 - 325
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Reuse of the valuable knowledge gained through the realization of software projects is an important step in overcoming well-known problems of the software industry such as wrong schedules and cost estimations, low productivity, and low product quality. To promote this kind of reuse the authors propose an approach relying on an explicit representation of the software processes by process descriptio... View full abstract»

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  • QUICK: graphical user interface to multiple databases

    Publication Year: 1996, Page(s):404 - 409
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Formulating queries to access multiple databases can be a formidable task, especially when many terms from various databases and complex constraints are involved. To specify a multidatabase query, the user usually has to search through documents for exact database terms and learn the multidatabase language. The report presents QUICK (QUery Interface to CPL-Kleisli), a graphical user interface to m... View full abstract»

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  • An incremental update propagation scheme for a cooperative transaction model

    Publication Year: 1996, Page(s):353 - 362
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    Engineering design applications require the support of long transactions in cooperative environments The problem of the existing copy/update/merge approaches is that the partial effects of a committed transaction may be not part of the merged version. The paper introduces a new cooperative transaction model, which allows updates to be progressively notified or propagated into other transactions ac... View full abstract»

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  • Definition of deductive conceptual models of OODBs

    Publication Year: 1996, Page(s):313 - 318
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The definition of deductive conceptual models (DCMs) using Prolog in order to specify different aspects of OODBs is proposed. The result of the specification process using this technique is an executable prototype of the system. Having a prototype directly available, along with the system specifications, is particularly useful in order to define additional elements in the context of OODBs (e.g. sc... View full abstract»

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  • Checking extensional constraints of federated schemata

    Publication Year: 1996, Page(s):398 - 403
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The authors describe a federated information system that uses a terminological system for the integration of heterogeneous databases. They present how this system is used for specifying correspondences between knowledge belonging to local schemas. These correspondences are specified as a set of assertions that cover the inter- and intra-schema constraints. They also present an algorithm for checki... View full abstract»

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  • Adding semantics for version propagation in OODBs

    Publication Year: 1996, Page(s):222 - 227
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    Object version propagation is a means of managing versions of complex objects automatically. Complex objects are objects linked to other objects by dependence relations such as composition, inheritance, association, equivalence, etc. The object version propagation model presented in the paper associates the version propagation capabilities, called version propagation strategies, with relations, th... View full abstract»

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  • Implementation of a speculative concurrency controller

    Publication Year: 1996, Page(s):347 - 352
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Many scheduling algorithms for databases have been developed in order to improve transaction responsiveness. Some developed algorithms meet special needs of real-time databases. These algorithms however, deal with temporal execution aspects, often disregarding semantics of data usage which could further improve performance. One such algorithm is speculative concurrency control, which uses executio... View full abstract»

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  • Resource discovery: modelling, cataloguing and searching

    Publication Year: 1996, Page(s):70 - 75
    Cited by:  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    In seeking information resources on the Internet, existing search systems exhibit uneven selectivity (B.C. Desai and R. Shinghall, 1996). This problem has prompted a number of researchers to turn their attention to the development and implementation of metadata models for use in indexing and searching on the WWW and Internet (B.C. Desai, 1995). The objective of our project is to design a system to... View full abstract»

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  • Grid file declustering, an implementation of a multidimensional indexing strategy

    Publication Year: 1996, Page(s):94 - 99
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The paper describes work on the implementation of a grid file based declustering strategy on a prototype multiprocessor database machine, MEDUSA. The paper discusses the implementation techniques used by the authors and reviews the effectiveness of a grid file indexing system within a multiprocessor environment. The MEDUSA prototype is based on a shared nothing architecture, each transaction node ... View full abstract»

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  • Real-time scheduling for semantic concurrency control of object-oriented database systems

    Publication Year: 1996, Page(s):214 - 221
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The paper presents a new real-time scheduling protocol for semantic concurrency control of object-oriented database systems. Although recent results of object-oriented serializability are efficient in semantic concurrency control, these results still lack real-time schedulability. The authors' new scheduling protocol takes into account not only object-oriented serializability but also real-time sc... View full abstract»

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  • Optimizing query evaluation in deductive databases using reductions

    Publication Year: 1996, Page(s):30 - 39
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    We show how it is possible to exploit reduction theory of high level Petri net theory, for query optimization in deductive databases. For this we first present a model derived from high level Petri nets, called Deductive Coloured Petri Net (DCPN), which allows an efficient implementation of deductive database management systems. Thus, we give conditions of applying high level Petri net reduction t... View full abstract»

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  • Performance upgrade for large object bases using disk arrays

    Publication Year: 1996, Page(s):341 - 346
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    The authors propose the use of multiple disks to increase the bandwidth of disk I/O so as to alleviate the I/O bottleneck problem existed in OODB applications. However, a major difficulty in using multiple disks for the support of OODBs is that an object may reference or be referenced by other objects through associations. This requires that the search of objects be sequential through the associat... View full abstract»

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  • A method for designing CSCW systems

    Publication Year: 1996, Page(s):419 - 424
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The paper describes a method that has been used to design CSCW systems for large widely dispersed groups. The method starts by describing the collaborative context in concepts that are then used as guidelines for selecting a platform of services. A systematic way for selecting services and generating platforms is described View full abstract»

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  • Using rough sets for rough classification

    Publication Year: 1996, Page(s):268 - 273
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Rough sets theory is emerging as a powerful tool for knowledge discovery in databases. The author introduce a rough sets based method for learning classification rules. The author's method will not necessarily derive all the consistent classification rules from a database, nor will the rules derived be totally consistent with the database. Rules are derived when they meet some user specified crite... View full abstract»

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  • Probabilistic classification in Osiris, a view-based OO DBMS and KBMS

    Publication Year: 1996, Page(s):62 - 68
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The Osiris system implements an object data model which was designed to enable the users to share data through a view mechanism. Views, which play the role of subclasses in an object perspective, are defined by their logical properties. Determining the views whose properties are satisfied by a given instance is the very mechanism of classification in knowledge bases. An in-depth static analysis of... View full abstract»

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  • On the reusability of ontologies in knowledge-system design

    Publication Year: 1996, Page(s):256 - 261
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    The authors describe a case study which supports the claim that ontologies are reusable components in the design of knowledge systems. An ontology documents important domain assumptions which would otherwise remain implicit. Whereas a conceptual (or formal) system specification differs between different knowledge systems (even in the same domain), they show the underlying ontology to be invariant.... View full abstract»

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  • A concept of data migration in a distributed, object-oriented knowledge base

    Publication Year: 1996, Page(s):391 - 396
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    The article presents the development of a concept for the distribution and migration of data to several databases within a distributed knowledge base. Thus a concept for a load-dependent and application-specific migration of data is introduced which takes into consideration the number and sort of accesses to the data. The main part of the migration method is a distribution function, which generate... View full abstract»

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  • The design of an extensible multimedia library for an OODBMS

    Publication Year: 1996, Page(s):208 - 213
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    Most database management systems deal with “binary large objects” (BLOBs). However, multimedia data types are being introduced to deal explicitly with still pictures, cartographic images and more recently video and audio. Nevertheless, limiting oneself to introducing these new data types is not a sufficient condition for easy modelling of multimedia schemas integrating multimedia infor... View full abstract»

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  • A comparative study of temporal DBMS architectures

    Publication Year: 1996, Page(s):153 - 164
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    In the past few years, a number of implementations of temporal DBMSs has been reported. Most of these implementations share a common feature, which is that they have been built as an extension to a snapshot DBMS. The authors present three alternative design approaches that can be used for extending a snapshot DBMS to support temporal data, and evaluate the suitability of each approach, with respec... View full abstract»

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  • Processing deductions in an active fashion

    Publication Year: 1996, Page(s):23 - 29
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    Active and deductive rules in databases and procedural attachment in knowledge bases are used as mechanisms of computation of derived attributes. These research domains have become very closely related. The support of derivations in current active databases suffers from many semantic and technical problems. Active rules in their ECA (Event Condition Action) form are event oriented whereas derivati... View full abstract»

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  • A universal query interface for heterogeneous distributed digital libraries

    Publication Year: 1996, Page(s):332 - 339
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Various kinds of digital libraries are accessible on the WWW (World Wide Web). The interoperability among those systems is one of the major topics of the digital library community. The paper presents the HyNeSS model and its query interface for that purpose. The HyNeSS model integrates the entity relationship model and predicate logic, and provides a universal and formal expression for network-ori... View full abstract»

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  • Indeterminateness in qualitative and quantitative reasoning

    Publication Year: 1996, Page(s):262 - 267
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A central issue of expert systems is the man-machine interface. One of its most ergonomic realizations is a natural language interface. Uncertainty and indeterminateness are main properties of a natural language. While there are many formalisms dealing with uncertainty, there still is a strong need of those modeling indeterminateness. Therefore a formalism is presented which (a) formalizes the sem... View full abstract»

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  • Knowledge acquisition and representation through neighborhoods

    Publication Year: 1996, Page(s):49 - 55
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Knowledge representation is a major component of knowledge acquisition. A theoretical model for the representation of knowledge in a given problem domain is developed through the use of the mathematical notion of neighborhood. The model as flexible enough to support the representation of a semantic structure which can be mathematically encoded as a weak distance, a binary relation, or a topology. ... View full abstract»

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