http://dl.gi.de/handle/20.500.12116/28515 2026-07-21T13:38:36Z 2026-07-21T13:38:36Z Schewe, Klaus-Dieter Thalheim, Bernhard Kaschek, Roland http://dl.gi.de/handle/20.500.12116/28539 2019-10-11T10:53:19Z 2004-01-01T00:00:00Z

A deontic logic for group-oriented web information systems Schewe, Klaus-Dieter; Thalheim, Bernhard; Kaschek, Roland Feltz, Fernand; Oberweis, Andreas; Otjacques, Benoît 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.

2004-01-01T00:00:00Z Simon, Carlo Dehnert, Juliane http://dl.gi.de/handle/20.500.12116/28538 2019-10-11T10:53:19Z 2004-01-01T00:00:00Z

From business process fragments to workflow definitions Simon, Carlo; Dehnert, Juliane Feltz, Fernand; Oberweis, Andreas; Otjacques, Benoît The use of Workflow Management Systems allows to automate numerous Business Processes within companies. For this, workflow definitions as executable derivates of business process descriptions must be formulated in a formal specification language. For both - the less formal descriptions of business processes and the workflow definitions - Petri net based approaches are widely used and well understood. In this paper, we study the process of deriving workflow definitions from less formal business process descriptions and even fragments of such descriptions and how to satisfy the correctness of these models among each other.

2004-01-01T00:00:00Z Hu, Ji Cordel, Dirk Meinel, Christoph http://dl.gi.de/handle/20.500.12116/28535 2019-10-11T10:53:18Z 2004-01-01T00:00:00Z

A virtual laboratory for IT security education Hu, Ji; Cordel, Dirk; Meinel, Christoph Feltz, Fernand; Oberweis, Andreas; Otjacques, Benoît Success of IT security not only depends on the evolution of technologies, but also relies on the knowledge of IT-Personnel and the level of their IT-security education. In order to deliver IT students and professionals hands-on experience of security technologies and tools by electronic means, this paper proposes the concept of a virtual laboratory and discusses its application in practical IT security education. Providing security experience in traditional ways is difficult because it needs dedicated test-bed networks and a lot of administrative efforts, which makes on-site training expensive. The virtual laboratory is an online security laboratory which is built with virtual machines. Virtual machines are software applications which simulate real machines on a host. Equipped with rich security tools and network interfaces, those virtual machines can be assigned to users as laboratory platforms. For that virtual machines are under monitoring and administration, the laboratory can be managed in a reliable way. This makes the running of a virtual laboratory on the Internet possible. Experience within the Tele- Lab “IT-Security” project successfully proves that the concept of virtual laboratories effectively eliminates geographical and financial limitations in traditional IT Security education.

2004-01-01T00:00:00Z Koschmider, Agnes Oberweis, Andreas Sommer, Daniel http://dl.gi.de/handle/20.500.12116/28534 2019-10-11T10:53:18Z 2004-01-01T00:00:00Z

RDF-basierte Integration von E-Learning-Metadaten in einem Informationsportal Koschmider, Agnes; Oberweis, Andreas; Sommer, Daniel Feltz, Fernand; Oberweis, Andreas; Otjacques, Benoît In diesem Beitrag wird beschrieben, in welcher Form E-Learning- Anwendungen durch ein Informationsportal unterstützt werden können. Am Beispiel eines sich in der Entwicklung befindlichen Portals für die Informatik wird zunächst gezeigt, wie Dienstleistungen zum Literaturnachweis und zur Volltextvermittlung sinnvoll in E-Learning-Anwendungen zu integrieren sind. Im Schwerpunkt des Beitrags wird untersucht, wie auch E-Learning-Inhalte in ein entsprechendes Nachweissystem aufgenommen und hiervon ausgehend vermittelt werden können. Die Integration von E-Learning-Inhalten mit Metadaten erfordert eine umfassende Beschreibung der Inhalte, wie sie in diesem Beitrag mit dem IEEE- Standard LOM erreicht wird. Für eine technische Umsetzung des Standards wird das Metamodell RDF vorgeschlagen. Nutzen aus einer Umsetzung von LOM-Metadaten im RDF-Modell können beispielsweise aus einer verbesserten Suche, einer effizienteren Verarbeitung von Informationen zu Lerninhalten und einer höheren Interoperabilität zwischen verschiedenen Anwendungen gezogen werden.

2004-01-01T00:00:00Z