Auflistung nach Autor:in "Winter, Johannes"
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- ZeitschriftenartikelOn Methods and Measures for the Inspection of Arbitrarily Oriented Subspace Clusters(Datenbank-Spektrum: Vol. 21, No. 3, 2021) Kazempour, Daniyal; Winter, Johannes; Kröger, Peer; Seidl, ThomasWhen using arbitrarily oriented subspace clustering algorithms one obtains a partitioning of a given data set and for each partition its individual subspace. Since clustering is an unsupervised machine learning task, we may not have “ground truth” labels at our disposal or do not wish to rely on them. What is needed in such cases are internal measure which permits a label-less analysis of the obtained subspace clustering. In this work, we propose methods for revising clusters obtained from arbitrarily oriented correlation clustering algorithms. Initial experiments conducted reveal improvements in the clustering results compared to the original clustering outcome. Our proposed approach is simple and can be applied as a post-processing step on arbitrarily oriented correlation clusterings.
- KonferenzbeitragUsing proxy re-encryption for secure data management in an ambient assisted living application(Open Identity Summit 2015, 2015) Zach, Hannes; Peinsold, Philip; Winter, Johannes; Danner, Peter; Hatzl, JakobWhenever applications process sensitive user data, secure storage and distribution plays a key role. This paper points out the security demands of an Ambient Assisted Living (AAL) application and demonstrates the usage of proxy re-encryption in order to fulfil its security requirements for storage and distribution of sensitive data. Because AAL systems often exhibit the same security needs as the application developed in the presented project, the described implementation can serve as a point of reference for similar projects.