By Topic

Database and Expert Systems Applications, 1996. Proceedings., Seventh International Workshop on

Date 9-10 Sept. 1996

Filter Results

Displaying Results 1 - 25 of 74
  • 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
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Lassy-a system for analyzing grammatical dependencies in Latin

    Publication Year: 1996, Page(s):275 - 284
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    The authors introduce the Latin analysis system Lassy, a system for analyzing Latin sentences. Tools for interacting with a database for morphological features are integrated along with interface for defining and applying a grammar database. They also give a small outline of the grammar model used in Lassy which is a pragmatic integration of linguistic theories known from both dependency and phras... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Managing multiple representations of georeferenced elements

    Publication Year: 1996, Page(s):364 - 370
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    The paper presents a framework for the management of multiple representations of georeferenced elements in a GIS environment. This solution is presented from a database perspective, and is based on extending the DBV version approach with view facilities. Given this environment, users can build consistent views of their modelled world, creating and combining different representation frameworks. The... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integrity checking for nested transactions

    Publication Year: 1996, Page(s):147 - 152
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    The authors present a mechanism to specify and to validate consistency constraints in object oriented databases. Constraints are specified using preand post-conditions associated with an exception handling mechanism. During transaction run-time, they treat exceptions corresponding to errors (in this case, they use immediate exceptions which are processed immediately) or presumption of errors (in t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Towards a highly scalable architecture for workflow management systems

    Publication Year: 1996, Page(s):439 - 444
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    Workflow management is aimed at the execution of business processes within an enterprise. Workflow management systems (WfMSs) build an execution platform for business processes in organizations of any size and structure. Performance is an important criteria for the applicability of WfMSs; they have to be scalable to varying load situations. The authors present a modular logical WfMS architecture, ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Join sequence optimization in parallel query plans

    Publication Year: 1996, Page(s):506 - 513
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    We show an alternative way to optimize join sequences in a shared nothing architecture of the distributed relational DBMS HEAD. The hardware resources are also used for database independent applications in concurrency, for database access. To achieve a better hardware utilization we span a complete search space involving all intermediate shapes between left deep, right deep and bushy trees, but wi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Specification of the database behavior through the active object paradigm

    Publication Year: 1996, Page(s):141 - 146
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    The paper is concerned with the use of the active object paradigm in designing active databases. The active object is an interesting means to best represent the dynamics of an information system. The authors propose a classification of real world objects following two categories: (i) the persistent active object that describes an object offering services when requested and reacts to events produce... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improving query response time in scientific databases using data aggregation -a case study

    Publication Year: 1996, Page(s):201 - 206
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    Although most state-of-the-art database systems have no inherent limitations w.r.t. the amount of data they can handle, the huge data quantities typically found in scientific database applications often exceed the feasibility level from a practical point of view when query performance is the issue. One theoretically well-known concept of improving query response time in scientific database applica... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The impact of seeking in partial match retrieval

    Publication Year: 1996, Page(s):432 - 437
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The authors extend the problem of partial match query satisfaction by studying the impact of seeking. They study the physical location of the output pages by considering the number and the sparseness of cylinders holding the resulting pages. Lower and upper seek time bounds, as well as the average behavior of the seek time are calculated by assuming some real figures of specific modern disk system... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Object-oriented modelling of periodicals

    Publication Year: 1996, Page(s):9 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    As new online systems to publish documents are quickly arising, more powerful models for multimedia documents are needed. To achieve new tools for efficiently managing these large data banks, it is not enough to represent the structure of documents in a standard format. To classify and represent properties of these publications are also important considerations. We apply an extended object oriente... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Extending ODMG for federated database systems

    Publication Year: 1996, Page(s):304 - 312
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A federated database system (FDBS) allows uniform and transparent access to the data of multiple heterogeneous DBS. Therefore the federation layer converts the heterogeneous data into a canonical data model. Object-oriented data models are shown to be most appropriate for a canonical data model. As a new standard has arisen in the object-oriented database area, ODMG-93 (ODMG), the paper extends th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Interfacing a relational database using conceptual graphs

    Publication Year: 1996, Page(s):499 - 505
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    The conceptual graph model is a knowledge representation formalism. Taking this formalism as a basis, the authors proposed a modelisation of relational database notions (schemata, data, queries). The article is based on this modelisation. They propose to use a copy of the structure of a relational database (relation schemata, set of attribute names) represented by a conceptual graph knowledge base... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The ARCS data point processor

    Publication Year: 1996, Page(s):40 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    The paper presents the main ideas behind our soft real time database system prototype called Data Point Processor (DPP). The main aim in designing such systems is to minimize the application programs part of database management and therefore to avoid heavy data transfers between the database server and the application client due to polling. Our design is based on the observation of data transfer a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An introduction to schema versioning in OODBMS

    Publication Year: 1996, Page(s):132 - 139
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Object oriented database management systems (OODBMS) have enormous advantages in comparison to relational systems in modeling highly complex and dynamic application scenarios. Still they lack some flexibility which could help their promotion into widely spread industrial use. Especially engineering environments frequently require schema changes to handle evolving designs. The main contribution of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Versioning model of image objects for easy development of image database applications

    Publication Year: 1996, Page(s):194 - 200
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A versioning model is presented for managing and controlling image objects in an image database. Image objects consist of attributes such as pixel data and methods such as image processing operations. Furthermore, image objects can be represented in terms of an application site model from the user viewpoint and an internal model from the implementation viewpoint. The former results in a virtual im... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A two-phase commit protocol and its performance

    Publication Year: 1996, Page(s):100 - 105
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    A number of schemes have been used in distributed database systems to coordinate the execution of the subtransactions of a global transaction. We study the performance of a simple modification to the basic two phase commit protocol called Prudent Two Phase Commit protocol. The protocol gives the transaction a second chance before it decides to abort it. This prudent approach prevents a transaction... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.