R
Raimo Launonen
Researcher at VTT Technical Research Centre of Finland
Publications - 10
Citations - 291
Raimo Launonen is an academic researcher from VTT Technical Research Centre of Finland. The author has contributed to research in topics: Security token & Collaborative filtering. The author has an hindex of 5, co-authored 10 publications receiving 240 citations.
Papers
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Journal ArticleDOI
A new similarity measure using Bhattacharyya coefficient for collaborative filtering in sparse data
TL;DR: This paper proposes a similarity measure for neighborhood based collaborative filtering, which uses all ratings made by a pair of users and finds importance of each pair of rated items by exploiting Bhattacharyya similarity.
Journal ArticleDOI
Multimodal astronaut virtual training prototype
Jukka Rönkkö,Jussi Markkanen,Raimo Launonen,Marinella Ferrino,Enrico Gaia,Valter Basso,Harshada Patel,Mirabelle D'Cruz,Seppo Laukkanen +8 more
TL;DR: A prototype was built to evaluate the usefulness of projection technology VEs and interaction techniques for astronaut training and results seem to indicate that projection technology-based VE systems and suitably selected interaction techniques can be successfully utilized in zero gravity training operations.
Book ChapterDOI
Exploiting Bhattacharyya Similarity Measure to Diminish User Cold-Start Problem in Sparse Data
TL;DR: Experimental results show that the approach based CF outperforms state-of-the art measures based CFs for cold-start problem and can find neighbors in the absence of co-rated items unlike existing measures.
Patent
Method and apparatus for a recommendation system based on token exchange
TL;DR: In this paper, a recommendation system based on the actions of a group of users, and not requiring prior metadata, is provided, which utilizes a set of identifiable tokens, associated with each entity, an entity being either a user or an item.
Book ChapterDOI
Distance based Incremental Clustering for Mining Clusters of Arbitrary Shapes
Bidyut Kr. Patra,Bidyut Kr. Patra,Ollikainen Ville,Raimo Launonen,Sukumar Nandi,Korra Sathya Babu +5 more
TL;DR: A distance based incremental clustering method, which can find arbitrary shaped clusters in fast changing dynamic scenarios and can produce exactly same clustering results as produced by the recently proposed al-SL method.