D. Frosch-Wilke

Publications of D. Frosch-Wilke

• Evolutionary Design of Collaborative Learning Processes through Reflective Petri Nets

  Authors: D. Frosch-Wilke, S. Sanchez-Alonso, J.M. Dodero

  Advanced Learning Technologies, 2008. ICALT '08. Eighth IEEE International Conference on; 08/2008

  Although the process-oriented nature of collaborative learning is quite evident, current e-learning systems mainly concentrate on individual learning tasks rather than on learning processes. Thus, inAlthough the process-oriented nature of collaborative learning is quite evident, current e-learning systems mainly concentrate on individual learning tasks rather than on learning processes. Thus, in recent years some concepts have been presented to use workflow management technologies for the management of learning processes. These concepts lack in the evolution of dynamic learning processes during their lifetimes. We propose and discuss the application of a Petri net-based reflective framework to change cooperative learning processes during execution.

• A maximum entropy analysis of the single server queue

  Authors: D. Frosch-Wilke, K. Natarajan

  Modeling, Analysis, and Simulation of Computer and Telecommunication Systems, 1994., MASCOTS '94., Proceedings of the Second International Workshop on;

  Demanding a certain structural property, derived by applying the principle of maximum entropy to single server systems, from the equilibrium-queue-length distribution of the M/G/1 system leads toDemanding a certain structural property, derived by applying the principle of maximum entropy to single server systems, from the equilibrium-queue-length distribution of the M/G/1 system leads to the generalized exponential (GE) service time distribution. The G/GE/1 queue is analysed by means of spectrum factorization of Lindley's integral equation. We obtain explicit expressions for a job's waiting time and sojourn time distribution, and for the equilibrium-queue-length distribution seen by an arriving job as well as seen at an arbitrary instant of time; the last one satisfies the structural property for arbitrary arrival processes. Moreover, the G/GE/1 queue can play a central role in the maximum entropy analysis of general open queueing networks with FCFS single server stations

• An extended and adaptable information model for learning objects

  Authors: D. Frosch-Wilke

  Advanced Learning Technologies, 2004. Proceedings. IEEE International Conference on;

  Learning objects are fundamental elements of a new conceptual model for content creation and course composition in Web-based education. Learning objects' metadata (LOM) facilitate adaptive selectionLearning objects are fundamental elements of a new conceptual model for content creation and course composition in Web-based education. Learning objects' metadata (LOM) facilitate adaptive selection of learning objects on the Web as well as the instructional development of Web-based courses. Although there are a number of ongoing LOM standard initiatives a lot of problems with LOMs are reported: reaching from more technical applications (e.g. data integrity deficiencies) to contextualization problems. In this paper, we present an information model for learning objects, capable to solve many of these problems. We use proven object-oriented design patterns for modeling the different metadata elements of learning objects and their relationships.