Delay-Tolerant Collaborative Filtering

in Proceedings of the 12th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (2009)

Recommender systems using collaborative filtering are a well-established technique to overcome information overload in today's digital society. Currently, predominant collaborative filtering systems ... [more ▼]

Recommender systems using collaborative filtering are a well-established technique to overcome information overload in today's digital society. Currently, predominant collaborative filtering systems mostly depend on huge centralized databases to store user preferences and furthermore are only available when connected to Internet. In this paper, we consider an incremental recommender system for highly dynamic mobile environments where no central global knowledge is available and communication links are rather unreliable in comparison to static networks. We present an algorithm that aims to reach a reasonable prediction coverage and accuracy while keeping the amount of additional network overhead as small as possible, maximizing the performance of our system. For this purpose, the presented algorithm is based on a delay-tolerant broadcasting mechanism on top of a weighted cluster topology. Evaluation results show that in terms of accuracy and coverage the results of the presented algorithm converge on those obtained from a global knowledge scenario, even in the case of message loss. [less ▲]

Collaborative Filtering via Epidemic Aggregation in Distributed Virtual Environments

in Proceedings of the 5th International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom) (2009)

Warum und wie Schüler ab 8 Jahren Programmieren lernen sollten

in Lecture Notes in Informatics (LNI), DeLFI 2008: Die 6. E-Learning Fachtagung Informatik (2008)

Collaborative Filtering in Artefact-based m-Learning Environments

in International Workshop on Mobile and Ubiquitous Learning Environments (MULE 2007) held in conjunction with 15th International Conference on Computers in Education (ICCE 2007) (2007)