Publikationen

Hier finden Sie von Know-Center MitarbeiterInnen verfasste wissenschaftliche Publikationen

2015

Kowald Dominik, Kopeinik S., Seitlinger Paul, Trattner Christoph, Ley Tobias

Refining Frequency-Based Tag Reuse Predictions by Means of Time and Semantic Context

Mining, Modeling, and Recommending'Things' in Social Media, MSM'2015, Springer, 2015

Buch
In this paper, we introduce a tag recommendation algorithmthat mimics the way humans draw on items in their long-term memory.Based on a theory of human memory, the approach estimates a tag'sprobability being applied by a particular user as a function of usagefrequency and recency of the tag in the user's past. This probability isfurther refined by considering the inuence of the current semantic contextof the user's tagging situation. Using three real-world folksonomiesgathered from bookmarks in BibSonomy, CiteULike and Flickr, we showhow refining frequency-based estimates by considering usage recency andcontextual inuence outperforms conventional "most popular tags" approachesand another existing and very effective but less theory-driven,time-dependent recommendation mechanism.By combining our approach with a simple resource-specific frequencyanalysis, our algorithm outperforms other well-established algorithms,such as FolkRank, Pairwise Interaction Tensor Factorization and CollaborativeFiltering. We conclude that our approach provides an accurateand computationally efficient model of a user's temporal tagging behavior.We demonstrate how effective principles of recommender systemscan be designed and implemented if human memory processes are takeninto account.
2015

Kowald Dominik, Seitlinger Paul, Kopeinik Simone, Ley Tobias, Trattner Christoph

Forgetting the Words but Remembering the Meaning: Modeling Forgetting in a Verbal and Semantic Tag Recommender

Mining, Modeling, and Recommending'Things' in Social Media, MSM'2015, Springer, 2015

Buch
We assume that recommender systems are more successful,when they are based on a thorough understanding of how people processinformation. In the current paper we test this assumption in the contextof social tagging systems. Cognitive research on how people assign tagshas shown that they draw on two interconnected levels of knowledge intheir memory: on a conceptual level of semantic fields or LDA topics,and on a lexical level that turns patterns on the semantic level intowords. Another strand of tagging research reveals a strong impact oftime-dependent forgetting on users' tag choices, such that recently usedtags have a higher probability being reused than "older" tags. In thispaper, we align both strands by implementing a computational theory ofhuman memory that integrates the two-level conception and the processof forgetting in form of a tag recommender. Furthermore, we test theapproach in three large-scale social tagging datasets that are drawn fromBibSonomy, CiteULike and Flickr.As expected, our results reveal a selective effect of time: forgetting ismuch more pronounced on the lexical level of tags. Second, an extensiveevaluation based on this observation shows that a tag recommender interconnectingthe semantic and lexical level based on a theory of humancategorization and integrating time-dependent forgetting on the lexicallevel results in high accuracy predictions and outperforms other wellestablishedalgorithms, such as Collaborative Filtering, Pairwise InteractionTensor Factorization, FolkRank and two alternative time-dependentapproaches. We conclude that tag recommenders will benefit from goingbeyond the manifest level of word co-occurrences, and from includingforgetting processes on the lexical level.
2015

Lindstaedt Stefanie , Ley Tobias, Sack Harald

Proceedings of the 15th International Conference on Knowledge Technologies and Data-driven Business

i-KNOW '15 15th International Conference on Knowledge Technologies and Data-Driven Business, 2015

Buch
2014

Ley Tobias, Tammets Kairit, Lindstaedt Stefanie

Orchestrating Collaboration and Community Technologies for Individual and Organisational Learning

Technology Enhanced Professional Learning–Processes, Practices and Tools, Littlejohn, Allison; Margaryan, Anoush, Routledge, 2014

Buch
2012

Seitlinger Christian, Schöfegger Karin, Lindstaedt Stefanie , Ley Tobias

Community-orientiertes Lernen

CSCL-Kompendium-Lehr-und Handbuch zum computerunterstützten kooperativen Lernen, Oldenburg, 2012

Buch
2009

Schmidt A., Hinkelmann K., Ley Tobias, Lindstaedt Stefanie , Maier R., Riss U.

Conceptual Foundations for a Service-oriented Knowledge and Learning Architecture: Supporting Content, Process, and Ontology Maturing

Networked Knowledge - Networked Media Integrating Knowledge Management, New Media Technologies and Semantic Systems, Studies in Computational Intelligence, Pellegrini, T., Auer, S., Tochtermann, K., Schaffert, S., Springer, 2009

Buch
Effective learning support in organizations requires a flexible and personalizedtoolset that brings together the individual and the organizational perspectiveon learning. Such toolsets need a service-oriented infrastructure of reusable knowledgeand learning services as an enabler. This contribution focuses on conceptualfoundations for such an infrastructure as it is being developed within the MATUREIP and builds on the knowledge maturing process model on the one hand, and theseeding-evolutionary growth-reseeding model on the other hand. These theories areused to derive maturing services, for which initial examples are presented.
2008

Pammer-Schindler Viktoria, Ley Tobias, Lindstaedt Stefanie

tagr: Unterstützung in kollaborativen Tagging-Umgebungen durch Semantische und Assoziative Netzwerke

Good Tags Bad Tags - Social Tagging in der Wissensorganisation, Gaiser, B., Hampel, T., Panke, S., Waxmann Verlag, 2008

Buch
2007

Ley Tobias, Jeanquartier Fleur, Köck Anna Maria

Neurovation - Kreativitätstool für Knowledge Worker

In R. Willfort, K. Tochtermann, A. Neubauer (Hrsg.): Creativity@Work für Wissensarbeit, Shaker Verlag, Aachen, 2007

Buch
2006

Ley Tobias, Albert D., Lindstaedt Stefanie

Competency Management using the Competence Performance Approach: Modeling, Assessment, Validation and Use

in: Sicilia, M.A. (Ed.), Competencies in Organizational E-Learning: Concepts and Tools, Information Science Publishing, Hershey, PA, 2006

Buch
This chapter introduces a new approach in organizational competency management, which is based on Korossy's competence performance approach and which rests on the central idea of connecting competencies to actual job performance. Such an approach has several important benefits when compared to more traditional approaches. First, it brings competency modeling and assessment more closely to the actual work processes and tasks. Second, it makes possible validation of the models and the assessment within the modeling and assessment porcedure. Finally, it is better able to cope with more dynamic and knowledge-based settings. Three case studies in engineering, human resource management and research and development illustrate how the approach is introduced, evaluated and applied. The purpose of the chapter is to inform researchers in e-learning and knowledge management of how competencies can be used to support work-integrated assessment and learning.
2006

Ley Tobias

Organizational Competency Management – A Competence Performance Approach

Grazer Schriftenreihe Knowledge Management, Shaker Verlag, Aachen, 2006

Buch
2005

Rollett H., Schachner W., Dösinger G., Ley Tobias, Ulbrich Armin, Puntschart I.

How to Provide One Stop Shop E-learning? A Real World Business Model

E-Learning: Einsatzkonzepte und Geschäftsmodelle, Breitner, M. H., Heidelberg, 2005

Buch
2004

Lindstaedt Stefanie , Farmer J., Ley Tobias

Betriebliche Weiterbildung

CSCL-Kompendium - Lehr- und Handbuch für das computerunterstützte kooperative Lernen, Haake, J., Schwabe, G., Wessner, M., Oldenbourg Wissenschaftsverlag, München,Germany, 2004

Buch
2004

Ley Tobias

Management Intellektuellen Kapitals: Eine sozial-interaktive Perspektive

In Wyssusek, B. (Ed.): Wissensmanagement komplex : Perspektiven und soziale Praxis, Schmidt, Berlin, 2004

Buch
2004

Lindstaedt Stefanie , Ley Tobias, Farmer Johannes

CSCL in der betrieblichen Weiterbildung

CSCL-Kompendium-Lehr-und Handbuch für das computerunterstützte kooperative Lernen, 2004

Buch
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