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Database and Expert Systems Applications, 1997. Proceedings., Eighth International Workshop on

1-2 Sept. 1997

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Displaying Results 1 - 25 of 112
  • Database and Expert Systems Applications. 8th International Conference, DEXA '97. Proceedings

    Publication Year: 1997
    Request permission for commercial reuse | PDF file iconPDF (1419 KB)
    Freely Available from IEEE
  • Specifying indefinite workflow-functions in ad-hoc dialogs

    Publication Year: 1997, Page(s):30 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB)

    Within a workflow management system, a dialog system is suggested to handle indefinite (vague, imprecise) workflow situations. The Issue Based Information System (IBIS) may be extended by explanatory dialogs, allowing a debate on conclusions, premises and rules. Horizontal and vertical dimensions as well as productive and reductive directions are distinguished in an explanatory dialog in order to ... View full abstract»

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  • Modeling samples processing in laboratory environments as scientific workflows

    Publication Year: 1997, Page(s):49 - 54
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    While workflow management appears to be an accepted technology in business applications and enterprises for enhancing their efficiency, its use in non business environments is still in its infancy. One such domain comprises scientific laboratories; the paper outlines how the workflow paradigm can fruitfully be employed in an environment of this kind. Specifically, it is indicated how to improve th... View full abstract»

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  • Cooperative and integrated workflow and document management for engineering applications

    Publication Year: 1997, Page(s):68 - 73
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (623 KB)

    Engineering workflow management has to cope with a great variety of processes. Well structured and a priori defined activities are mixed with creative, less structured, and continuously evolving process steps. The classical coordination support provided by workflow management systems has to be enhanced to cope with dynamic, product centered, and cooperative processes. We concentrate on cooperation... View full abstract»

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  • A search system based on image features

    Publication Year: 1997, Page(s):80 - 85
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (643 KB)

    We present a system platform for the content based retrieval of images. The system has resulted in a prototype with two major steps: extraction and queries. We combine manual, semi automatic and automatic approaches in order to extract image regions (colors, shapes). Regions, which are extracted semi automatically, are significant and relevant for the final user. Shapes are represented by powerful... View full abstract»

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  • Extending database space of INADA/ODMG for very large databases on 64 bit workstations

    Publication Year: 1997, Page(s):112 - 117
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Discusses the properties of a 64-bit environment and the redesign of our 32-bit INADA/ODMG object management system for the 64-bit environment. The new implementation is introduced based on the 64-bit properties. In the new design, a very large on-disk database can be mapped onto a large-size virtual memory without considering the size limitation. High query performance and storage capability are ... View full abstract»

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  • Designing navigational contexts using an OO query language

    Publication Year: 1997, Page(s):130 - 135
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (486 KB)

    Discusses how to use an object-oriented (OO) query language for designing some features of hypermedia applications. We show that it allows designers to define navigational contexts by retrieving instances related by special relationships (one-to-many or aggregation relationships) specified in the conceptual model or as a set of a arbitrary instances where a condition holds. We first describe an OO... View full abstract»

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  • Towards a spatio-temporal OQL for the four dimensional spatial database system Hawks

    Publication Year: 1997, Page(s):142 - 147
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    Discusses a spatio-temporal object query language (OQL), which treats spatial data and temporal data in the same way. We address spatial, temporal and spatio-temporal predicates and operators, and then show the queries in the spatio-temporal OQL and the ones in the internal expression of the spatio-temporal database system Hawks. This language is going to be implemented in INADA/ODMG, which is a d... View full abstract»

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  • Giving permission implies giving choice

    Publication Year: 1997, Page(s):198 - 203
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (701 KB)

    When we want to examine different kinds of forms of acts within the framework of the description of the Dutch criminal law, whether an act is permitted or not permitted, we can encounter a difference. On the one hand, it could be the case that a certain act is permitted by a competent normative authority. On the other hand, it could be the case that in the Dutch criminal law a certain act is weak ... View full abstract»

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  • An adaptive value-based scheduling policy for multiprocessor real-time database systems

    Publication Year: 1997, Page(s):254 - 259
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    In a real-time application, a transaction may be assigned a value to reflect the profit of completing the transaction before its deadline. Satisfying both goals of maximizing the totally obtained profit and minimizing the number of missed transactions at the same time is a challenge. The authors present an adaptive real-time scheduling policy named value-based processor allocation (VPA-k) for sche... View full abstract»

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  • Tree-based buffer management in real-time database systems

    Publication Year: 1997, Page(s):260 - 264
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (374 KB)

    This paper deals with buffer management for tree-based access-path structures in real-time database system kernels. A predictable and efficient buffer replacement strategy for B- and B/sup +/-trees is introduced. The strategy called LC (Level Control) uses the structural information known about the trees and the tree search to determine a node to be replaced. The basic idea is to use the level of ... View full abstract»

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  • READS: a prototyping environment for real-time active applications

    Publication Year: 1997, Page(s):265 - 270
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (698 KB)

    We present our Real-time Active Database System, READS, which is a prototyping environment for real-time active database applications on a conventional Unix environment, e.g., Solaris 2.4. In READS, transactions are associated with deadlines and priorities. Priority scheduling is supported by the real-time extensions provided in the underlying operating system. READS can be served as a testbed for... View full abstract»

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  • ELEKTRA: an electronic article delivery service

    Publication Year: 1997, Page(s):272 - 277
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (626 KB)

    With the success of the World-Wide Web new solutions for very fast document access have emerged. ELEKTRA is an article delivery system that supports full-text and relational information retrieval as well as electronic article ordering and delivery. Full-length articles can be both viewed by standard-web browsers and printed by PostScript printers in a high resolution quality. ELEKTRA has been real... View full abstract»

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  • Supporting adaptable technical information systems in heterogeneous environments-using WWW and ORDBMS

    Publication Year: 1997, Page(s):295 - 303
    Cited by:  Papers (1)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1163 KB)

    Due to the ever rising competition in nearly all industrial sectors, there is a strong need for integrated information systems (ISs) that will store, retrieve, manipulate and exchange information efficiently to support all activities in an enterprise. Moreover, such an IS should not be a one-size-fit-all or a permanent solution, rather, the adaptability must be pursued so that the system can deal ... View full abstract»

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  • Design of a visual query language for hospital information systems

    Publication Year: 1997, Page(s):306 - 311
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (731 KB)

    A visual query language, designed to be used in a hospital information system is presented. The language exhibits a high degree of adaptation to all kinds of users, as well as a powerful set of tools to formulate queries. It appears to be very simple to learn and it is especially suited to object oriented models. We have also developed a textual language equivalent to the visual one and we have ma... View full abstract»

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  • Security concerns for mobile information systems in health care

    Publication Year: 1997, Page(s):312 - 317
    Cited by:  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (527 KB)

    We study the mutually restricting problems of permanent availability and legally demanded security of patient data in clinical information systems. Inefficiencies in today's clinical information management call for an integrated technological support for hospitals. In particular, client/server solutions offer the flexibility and spatial independence appreciated in health care. On the other hand, m... View full abstract»

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  • Discovery and application of inter-class patterns in database

    Publication Year: 1997, Page(s):326 - 331
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (533 KB)

    Presents an inter-class pattern discovery method for real-world databases. While the data in a conventional database has a tuple structure, the data in pattern discovery has set-values or sequences. The structural differences between them may cause useless resulting patterns, and may result in an inefficient pattern discovery method. To resolve those issues, we propose an inter-class pattern disco... View full abstract»

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  • ATREUS: a model for the conceptual representation of a workflow

    Publication Year: 1997, Page(s):400 - 405
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (573 KB)

    We propose a workflow conceptual model able to represent clinical and managerial activities within health-care structures, the ATREUS model. This model was defined taking into account the intrinsic difficulties and complexity of processes in the health-care domain. This model uses: hypergraphs to represent processes graphically; a textual representation which describes each activity; and a state d... View full abstract»

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  • Towards flexible support for cooperation: group awareness in shared workspaces

    Publication Year: 1997, Page(s):406 - 411
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (707 KB)

    In the last decade since computer-supported cooperative work (CSCW) constituted as a research area on its own many interesting findings about groups of cooperating individuals, cooperative work, and technical support thereof have been made and a huge variety of groupware applications have been built. However, there is a discrepancy between the theoretical concepts elaborated and the functionality ... View full abstract»

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  • Evaluating workflow management systems

    Publication Year: 1997, Page(s):412 - 417
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (683 KB)

    We describe a project focusing on the evaluation of workflow management systems for a large Austrian bank. In the first part we establish a catalogue of evaluation criteria. It summarizes the huge amount of criteria into smaller classes (criteria categories) and orders the classes in a semantically structured directory. In the second part, we describe a tool implementing the evaluation framework. ... View full abstract»

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  • Web4Groups-a tool for telematic collaboration

    Publication Year: 1997, Page(s):425 - 430
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (577 KB)

    This paper presents the web-based group communication service Web4Groups. First it is shown how the project to develop this service is organized. The work of the project consortium consisting of 12 European partners is described. It is further explained how specific user groups in different areas are involved and how their needs are integrated in the development process. Secondly, the Web4Groups s... View full abstract»

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  • Extending the Van der Veer approach to cooperative work: a bridge between groupware task analysis and workflow design

    Publication Year: 1997, Page(s):431 - 439
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (918 KB)

    Recent evolution in IT research have brought different design methods for CSCW systems. Efforts to meet the requirements of integral solutions for CSCW systems are shifting: WFMS put the focus on support and automation of design/execution of tasks, database- and document management, status monitoring, etc. Most improvements comply with a bottom-up approach. The Groupware approach starts with a hol... View full abstract»

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  • Applying evolutionary algorithms to the problem of information filtering

    Publication Year: 1997, Page(s):450 - 458
    Cited by:  Papers (2)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1011 KB)

    This paper presents an intelligent information filtering system that learns from user feedback and behavior through evolutionary algorithms. By applying the learning abilities of a classifier system and genetic algorithms to the system, the following tasks can be performed: (1) reducing a user's information overload; (2) predicting the actions that the users are supposed to do; and (3) prioritizin... View full abstract»

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  • One application of neural networks for detection of defects using video data bases: identification of road distresses

    Publication Year: 1997, Page(s):459 - 464
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (747 KB)

    Describes an application of neural networks to the discovery of road surface distresses (cracks, etc.) from video sequences. After describing the context of this application, we detail its progressive design. We initially thought of using only one neural network to totally analyze each image extracted from a video sequence. We later thought of a more simple neural network analyzing only a small pa... View full abstract»

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  • Semantic cooperation of legacy information systems: an object-oriented framework

    Publication Year: 1997, Page(s):488 - 493
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (573 KB)

    When several legacy information systems have to cooperate, the issue is to define a global framework providing both semantic interoperability and loose coupling among heterogeneous local information sources. To conciliate such requirements, we propose an object-oriented framework dedicated to the semantic evaluation of global queries while respecting local autonomy. Several layers insure interoper... View full abstract»

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