Logo des Repositoriums

P063 - ISTA 2005 - Information Systems Technolopgy and its Applications

https://dl.gi.de/handle/20.500.12116/28337
Auflistung nach:

Auflistung P063 - ISTA 2005 - Information Systems Technolopgy and its Applications nach Erscheinungsdatum

Zu einem Punkt im Index springen:
1 - 10 von 22
  • Konferenzbeitrag
    A generalized framework for an ontology-based data-extraction system
    (Information systems technology and its applications, ISTA' 2005, 2005) Wessman, Alan; Liddle, Stephen W.; Embley, David W.
    Extraction of information from semi-structured or unstructured documents, such as web pages, is a useful yet complex task. Ontologies can achieve a high degree of accuracy in data extraction while maintaining resiliency in the face of document changes. Ontologies do not, however, diminish the complexity of a data-extraction system. As research in the field progresses, the need for a modular data-extraction system that decouples the associated processes continues to grow. In this paper we report on the implementation of such a system. The nature of our framework allows new algorithms and ideas to be incorporated into a data extraction system without requiring wholesale rewrites of a large part of the system's source code. It allows researchers to focus their attention on parts of the system relevant to their research without having to worry about introducing incompatibilities with the remaining components. We demonstrate the value of the framework by providing an implementation that exhibits appropriate characteristics.
  • Konferenzbeitrag
    Integration and cooperation of media types
    (Information systems technology and its applications, ISTA' 2005, 2005) Ma, Hui; Schewe, Klaus-Dieter; Thalheim, Bernhard
    Media types are a core design construct in the co-design approach for web information systems (WISs). They provide abstract means for describing content, functionality, context and adaptivity to user preferences and intentions, end-devices, and channel limitations. Basically, a media type is a view that is extended by operations and cohesion. Thus, the problem of integrating these extended views is a core design problem for WISs. In this paper we develop formal transformation rules for media type integration that are embedded in a pragmatic method addressing how they should be applied for integration. They extend view integration rules in such a way that operations and cohesion are dealt with simultaneously. Cooperation provides an alternative to integration in which the integrated view is only virtual, i.e. the constituating views are kept and exchange functions are designed to provide the same functionality as if the views were integrated. We show that the transformation rules can also be applied to the problem of media type cooperation.
  • Konferenzbeitrag
    Tool supported extraction of behavior models
    (Information systems technology and its applications, ISTA' 2005, 2005) Kop, Christian; Vöhringer, Jürgen; Hölbling, Martin; Horn, Thomas; Mayr, Heinrich C.; Irrasch, Christian
    Information system projects often suffer from incomplete or inadequate requirements specifications. In our opinion, which is supported by practical experience, these problems result from the fact that the models usually applied for requirements analysis are to abstract as to be easily understood and validated by the business owners, i.e. the end users. In addition to that, validation is often hampered by the fact that traditional modeling approaches do not relate the particular model elements to their corresponding requirements sources. We, therefore, propose an approach that uses a lean and thus more transparent requirements model, which is intermediate in the sense that it has to be mapped, after validation, to one of the traditional conceptual models. Clearly introducing such an additional step into the information system development process induces increased effort which has to be reduced by appropriate tool support. This paper concentrates on specific aspects and tool support for extracting behavior models out of requirements texts.
  • Konferenzbeitrag
    The challenges in web information systems development
    (Information systems technology and its applications, ISTA' 2005, 2005) Schewe, Klaus-Dieter
    The development of web information systems has led to new challenges regarding the scalability and expressiveness of methods. In particular, as systems become large, it becomes decisive to guarantee consistency and integrity of designs. The paper introduces the challenges in a step-by-step way and indicates how to cope with them. First, the conceptual model of a WIS as a collection of media types, i.e. extended views, is introduced. In this context the adaptivity to users, channels and devices will also be discussed. Secondly, WIS development is discussed on a higher level of abstraction dealing with tasks, roles, user profiles and storyboards. At this level equational reasoning can be applied. Finally, both levels of abstraction are combined leading to further challenges by using dynamic and deontic logics.
  • Konferenzbeitrag
    Designing distributed data warehouses and OLAP systems
    (Information systems technology and its applications, ISTA' 2005, 2005) Zhao, Jane
    On-line analytical processing (OLAP) systems deal with analytical tasks in businesses. As these tasks do not depend on the latest updates by transactions, it is assumed that the data used in OLAP systems are kept in a data warehouse, which separates the input coming from operational databases from the output going to dialogue interfaces for OLAP. In this article we present a 3-tier architecture for data warehouses and OLAP systems capturing the fundamental requirement of separating input from operational databases from output to OLAP systems. On this basis we start developing refinement rules to enable step-wise refinement for such systems, which includes pragmatic guidelines for the application of such rules.
  • Konferenzbeitrag
    Aspectual predesign: extending KCPM to map non-functional requirements
    (Information systems technology and its applications, ISTA' 2005, 2005) Shekhovtsov, Vladimir A.; Kostanyan, Arkady V.
    This paper presents an extension of the Klagenfurt Conceptual Predesign Model (KCPM) allowing taking into account the non-functional requirements to the system. These requirements are treated as crosscutting concerns. This process could be also seen as an addition to the AOSD paradigm that brings the gap between the Aspect-Oriented Requirement Engineering and Aspect-Oriented Modeling. The extensions of the KCPM schema and the new mapping rules are introduced for the case of asymmetric AOSD approach.
  • Konferenzbeitrag
    Surrogate object model: A new paradigm for distributed mobile systems
    (Information systems technology and its applications, ISTA' 2005, 2005) Maluk, Mohamed M. A.; Janakiram, D.; Chakraborty, Mohit
    Distributed mobile systems are characterized by asymmetry in both network connectivity and computing power, mobility of hosts and their constraints. To address these issues, existing approaches attempt to completely redesign distributed applications or algorithms to make them work in a distributed mobile environment. This paper proposes an alternate mechanism namely, the surrogate object model to handle the asymmetry problem in distributed mobile systems. The surrogate object is a representative for a particular Mobile Host (MH) in the wired network that maintains application specific data structures and methods. The surrogate object model maintains a cache of data stored in the mobile host and reduces wireless data transfers. The proposed novel model also provides an ideal placeholder for MH location information, thus solving the location management problem to handle mobility of hosts. A comprehensive simulation study of the surrogate object model has been done. Performance studies of a sample application with and without the surrogate object model illustrates the efficiency of developing applications over the surrogate object model.
  • Konferenzbeitrag
    An approach to knowledge-based data handling in complex process
    (Information systems technology and its applications, ISTA' 2005, 2005) Gamzayev, R.; Kuklenko, D.; Tkachuk, M.
    This paper presents an approach for knowledge-based data handling in complex Process Control Systems (PCS). Special attention is paid to the specific situations taking place in the technical processes, which run under control of such PCSs. To describe those specific situations we use the concept of Active Rule (AcR). The considered PCSs operate in the real-time mode. Because of this, handling a big number of active rules may cause violations of some real-time constraints. We propose an approach of Association Rules (AsR) in order to eliminate those problems. The collection of AsR is mined from the data describing the specific situations of processes. Those data are collected in PCS as a result of executing appropriate AcR. We elaborate a collection of modification patterns for simplifying the structure of existing AcR, and the general scheme for the interaction between AcR and AsR. The results presented in the paper are based on real-life projects that we performed in the domain of Web-based PCSs for Ukrainian gas-and-oil production enterprises.
  • Konferenzbeitrag
    Automated web service composition methods and tradeoffs
    (Information systems technology and its applications, ISTA' 2005, 2005) Stumptner, Markus
    This paper examines the use of constraint-based configuration for the composition of Web Services. Web Services are widely assumed to represent the basis for the next generation of flexible distributed applications in B2B E-commerce, and the composition of complex applications from individuals services has attracted much attention. We show how this composition problem can be addressed at increasing levels of semantic content embedded in the description of services, moving from purely manual composition to describing service matching as a configuration problem that can be solved using constraint-based methods. We examine the restrictions imposed by Se- mantic Web ontology languages and providing a succinct and high level mechanism for imposing the different boundary conditions resulting from the multilayered application environment. We give an example showing the configuration process for a simple example problem, discuss the ramifications of the full composition problem, and describe the resulting system architecture.
  • Konferenzbeitrag
    Engineering design performance management – from alchemy to science through ISTa
    (Information systems technology and its applications, ISTA' 2005, 2005) Matzke, Wolf-Ekkehard
    The drive for performance is omnipresent in modern society. We believe this to be true, although we only have a vague idea of what “performance” really means. The demand for management is omnipresent in modern society. We accept this to be true, although management theory is a science barely out of its infancy (Who wishes to be supervised by an infant?). Performance management is considered to be the need for the hour in modern society. We are told this is true, although we feel that we are trying to cope with something that we have very little comprehension of. Engineering is the omnipresent backbone of modern society. We experience this to be true, although we acknowledge that design is least as much an art as it is a science, a world where uncertainty rules. The impact of Information Society Technology (IST) is omnipresent in modern society. We understand this to be true; although we know that there is no point in automating something we don't understand. Somewhat ironically, one could conclude that Engineering Design Performance Management (EDPM) is about the challenge to handle the uncertain and appraise the unknown. Not to forget about IST embarked on a mission to automate everything it possibly could to pretend that there are ready answers. This is like alchemy, but for performance. Alchemy hovered between worlds. So does contemporary performance management hovering between fiction and reality. Alchemists proposed to use the philosopher's stone (materia prima), a mysterious, unknown substance that they believed to have the power to transmute base metals into gold. So does contemporary performance management by hailing IST as its “Magnus Opus”. Without a doubt, it is high time to rebuild a firm foundation of performance management. We need a consistent framework addressing the relevant aspects of performance management from the abstract level to the concrete level. Only than IST will be able to unfold its full potential, and deliver on its promises. The strategic potential of IST does not lie in empty automation that enforces unrealistic and oppressive processes. It lies in enabling better decision making in a highly complex environment of change, uncertainty, risk, and urgency.