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Auflistung nach Autor:in "Nikolai, Ralf"

1 - 6 von 6
  • Konferenzbeitrag
    Base Technologies for Distributed Environmental Information Systems
    (Umweltinformatik '97, 1997) Koschel, Arne; Kramer, Ralf; Nikolai, Ralf; Rolker, Claudia
    This tutorial presents base technologies for distributed environmental information systems that rely on open Internet technologies. These include the World-Wide Web (WWW), the object-oriented programming language Java, and the Common Object Request Broker Architecture CORBA. We show how these technologies can be easily combined to build architectures of loosely coupled components, in which single components still retain their autonomy. Several case studies from German and international projects that cover different aspects of envirgnmental information systems are presented.
  • Konferenzbeitrag
    Data Integration in the Field of Environmental Monitoring
    (Environmental Communication in the Information Society - Proceedings of the 16th Conference, 2002) Briesen, Marcus; Hofmann, Claus; Otterstätter, Arnd; Nikolai, Ralf; Mirtl, Michael; Schentz, Herbert; Vogel, Wilhelm
    In order to improve the quality of the environment national and international legislation increasingly asks for monitoring systems as an appropriate basis for decision making at all levels. The fundamental basis for all decisions is an integrated access to data from various programmes, databases, provinces, states etc. In this article we analyze the needs and requirements of data integration based on the examples of the water framework directive and integrated monitoring. Depending on the power of the local systems already in place we suggest two different ways of fulfilling these requirements: 1.) Providing a system that has a common user interface and various data connectors to access existing data in a uniform way. 2.) To establish a super database for (nearly) any kind of environmental data. A combination of both approaches would provide a tool kit which significantly decreases the effort for integration of existing and new data including uniform, polysemantic views and enabling substantial analysis and reporting.
  • Konferenzbeitrag
    Harmonisierter Zugang zu Umweltinformationen für Öffentlichkeit, Politik und Planung: Der Umweltdatenkatalog UDK im Einsatz
    (Umweltinformatik ’00 Umweltinformation für Planung, Politik und Öffentlichkeit, 2000) Swoboda, Walter; Kruse, Fred; Legat, Rudolf; Nikolai, Ralf; Behrens, Sven
    The Umweltdatenkatalog (UDK = Environmental data catalogue) is a metainformation system for locating environmental information available in public authorities. The UDK is introduced in Austria and Germany. This article addresses problems and solutions concerning harmonisation of metainformation. Special interest is given to aspects of collecting and querying metainformation as well as the use of UDK as a meta component of other information systems. The newly developed Virtual UDK allows to start a parallel query in the Internet applications of all involved UDK co-operation partners.
  • Konferenzbeitrag
    Informationsvernetzung am Beispiel des WWW-UDK
    (Environmental Communication in the Information Society - Proceedings of the 16th Conference, 2002) Behrens, Sven; Nikolai, Ralf; Kruse, Fred; Karschnik, Oliver
    Das Web ist die grundlegende Technologie für Informationszugriffe jederzeit und über- all. Die aktuelle Herausforderung bei der Weiterentwicklung von Web- Informationssystemen besteht darin, Informationen aus heterogenen und verteilten Quel- len nahtlos zu integrieren. In diesem Beitrag zeigen wir am Beispiel des WWW-UDK wie sich die technologischen Grundlagen der Vernetzungsmöglichkeiten in den letzen 5 Jahren verändert haben und welcher Nutzen sich daraus ergeben kann.
  • Konferenzbeitrag
    The Contribution of Audio Conferences to the Dematerialization of Meetings in the Age of the Web
    (Environmental Communication in the Information Society - Proceedings of the 16th Conference, 2002) Nikolai, Ralf; Buth, Kerstin; Koepke, Timo; Vogt, Gunter
  • Konferenzbeitrag
    WWW-UDK 4.0: Die neue Generation eines WebPortals zu deutschen und österreichischen Umweltdaten
    (Umweltinformatik ’99 - Umweltinformatik zwischen Theorie und Industrieanwendung, 1999) Nikolai, Ralf; Kazakos, Wassili; Kramer, Ralf; Behrens, Sven; Swoboda, Walter; Kruse, Fred
    Since its introduction in 1995 the environmental data catalogue UDK (Umweltdatenkatalog) has become a de-facto standard for environmental meta-information in German and Austrian governmental organisations. During the last year, the fourth generation of WWW-UDK, a tool for publishing UDK data on the Web, was developed based on a careful user requirement analysis. A complete redesign of the software makes possible that on the one hand advanced Internet technologies could be employed and on the other hand the various requirements of the different user groups could be fulfilled. To do so, three main components have been developed: (1) HTML-UDK which provides full retrieval functionality and requires minimal client equipment only. (2) J-UDK, an integrated Java applet of graphical, interactive tools for advanced users. (3) Virtual UDK which provides for the first time searches over distributed UDK data of different catalogues. Furthermore the interaction of WWW-UDK and WinUDK is presented.