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Auflistung nach Autor:in "Kaschek, Roland"

1 - 10 von 29
  • 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
    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
    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
    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
    A concept of configuring flexible application systems for business and administration processes
    (Information systems technology and its applications, ISTA' 2005, 2005) Grollius, Tobias; Ortner, Erich
    Business processes change with time. Component-based application systems offer the flexibility to effectively support frequently changing processes as they can be easily assembled of component variants most suitable to accomplish a task in a certain moment. This paper introduces two extreme types of configuring flexible application systems: pre-configured application systems and just-in-time configured application systems. As a prerequisite to component-based applications, a component repository and its meta schema are presented. Workflow Management Systems are proposed to control – beside the business processes – the construction processes.
  • Konferenzbeitrag
    Constructing POSE: A Tool for Eliciting Quality Requirements
    (Information systems technology and its applications – 6th international conference – ISTA 2007, 2007) Shekhovtsov, Vladimir A.; Kaschek, Roland; Zlatkin, Sergiy
    Quality requirements elicitation for new computer applications rests traditionally on interviewing stakeholders. That makes getting these requirements right more complicated than is necessary because the anticipated users not necessarily are good at talking about the kind of computer aid and its qualities they would appreciate. We suggest bypassing that problem by constructing and using POSE (parameterized online simulation environment). Within this environment, anticipated users can explore ways of computer support for their work; it then makes it easier to talk about a potential computerized aid and the qualities thereof. Using POSE also simplifies obtaining quantified scenarios related to the various system qualities. As a result, this environment aids in getting the quality requirements right.
  • Konferenzbeitrag
    A deontic logic for group-oriented web information systems
    (EMISA 2004 – Informationssysteme im E-Business und E-Government, Beiträge des Workshops der GI-Fachgruppe EMISA (Entwicklungsmethoden für Informationssysteme und deren Anwendung), 2004) Schewe, Klaus-Dieter; Thalheim, Bernhard; Kaschek, Roland
    Group-oriented web information systems (GWISs) are web-based dataintensive systems that are used by a group of people in order to fulfill common tasks. In particular, there are different roles for the users, each associated with some rights and obligations. The group orientation implies that some of these obligations and rights depend on actions done by other roles. In this article a deontic logic for formulating and reasoning about such obligations and rights is presented.
  • 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
    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.
  • Konferenzbeitrag
    Enhancing user experience for networked multimedia systems
    (Information systems technology and its applications, ISTA' 2005, 2005) Georgievski, Mladen; Sharda, Nalin
    As networked multimedia systems have evolved over the recent years, sophisticated multimedia applications have emerged. Through this, a revolution in the transmission of multimedia information over wired and wireless communication technologies has transpired. Society is now becoming more dependent on such technologies, and these are used in almost every aspect of our daily lives, including: communications, entertainment, education, marketing, research, health and medicine. To provide the user with effective experience in using these networked multimedia applications, it is imperative that optimum Quality of Service (QoS) is delivered. This requires innovative solutions for QoS management. These solutions need to employ better Human Computer Interaction (HCI) techniques and bridge the current gap between the user requirements and the system functionality. In our research, we have developed a Three Layer Quality of Service (TRAQS) model and defined a framework for QoS management of networked multimedia systems. A novel interface called the Quality Cost and Temporal Triangle (QCTT) has been implemented to provide the user with the ability to control the QoS in real-time. Furthermore, we have conducted a usability study in the application of the QCTT model for specifying and managing QoS. This paper articulates the need for developing novel QoS management models; presents the results of usability study carried out on one such model, i.e. the Quality Cost and Temporal Triangle; and discusses the benefits that can flow towards more effective deployment of networked multimedia applications.