Peter Ruppel
Technical University of Berlin
27 Papers
118 Citations
Peter Ruppel is an academic researcher from Technical University of Berlin. The author has contributed to research in topics: Location-based service & Computer science. The author has an hindex of 11, co-authored 27 publications. Previous affiliations of Peter Ruppel include Telekom Innovation Laboratories & Ludwig Maximilian University of Munich.
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Papers
Variations on the Clustering Algorithm BIRCH
TL;DR: This paper presents A-BIRCH, an approach for automatic threshold estimation for the BIRCH clustering algorithm, which renders the final global clustering step of BirCH unnecessary in many situations, which results in two advantages: first, the authors do not need to know the expected number of clusters beforehand, and second, without the computationally expensive final clustering, the fast B IRCH algorithm will become even faster.
123
Combining GPS and GSM Cell-ID positioning for Proactive Location-based Services
Nico Deblauwe,Peter Ruppel +1 more
- 06 Aug 2007
TL;DR: This paper defines the problem and proposes solutions for an energy- efficient combination of GPS and GSM Cell-ID positioning for mobile terminals and introduces several strategies for extending the lifetime of the battery.
62
Anonymous user tracking for location-based community services
Peter Ruppel,Georg Treu,Axel Küpper,Claudia Linnhoff-Popien +3 more
- 10 May 2006
TL;DR: In this paper, the authors present an anonymization technique for location-based community services (LBCSs), which employs distance-preserving coordinate transformations in conjunction with pseudonyms.
37
A-BIRCH: Automatic Threshold Estimation for the BIRCH Clustering Algorithm
Boris Lorbeer,Ana Kosareva,Bersant Deva,Dženan Softić,Peter Ruppel,Axel Küpper +5 more
- 23 Oct 2016
TL;DR: This paper presents A-BIRCH, an approach for automatic threshold estimation for the BIRCH clustering algorithm using Gap Statistic, which renders the global clustering step of BirCH unnecessary and does not require knowledge on the expected number of clusters beforehand.
20
Anonymization in Proactive Location Based Community Services
Georg Treu,Axel Küpper,Peter Ruppel +2 more
- 01 Jan 2005
TL;DR: The paper discusses why existing privacy mechanism for LBSs are not well suited for PLBCSs, and presents initial ideas for a novel anonymization technique, where location coordinates are obfuscated by a key shared among community members before they are emitted to aPLBCS.