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In recent years, location-based services and indoor positioning systems gained increasing importance for both, research and industry. Visual localization systems have the advantage of not being dependent on dedicated infrastructure and thus are especially interesting for navigation within buildings. While there are already approaches of using pre-recorded databases of reference images to obtain an...
Recommendation technologies support users in the identification of interesting products and services. Beside the wide-spread approaches of collaborative and content-based filtering, knowledge-based recommender technologies gain an increasing importance due to their capability of deriving recommendations for complex products such as financial services, technical equipment, or consumer goods. The identification...
Since the beginning of the ubiquitous computing era, context-aware applications have been envisioned and pursued, with location and especially proximity information being one of the primary building blocks. To date, there is still a lack of feasible solutions to perform proximity tests between mobile entities in a privacy-preserving manner, i.e., one that does not disclose one's location in case the...
Due to the increasing popularity of location-based services, the need for reliable and cost-effective indoor positioning methods is rising. As an alternative to radio-based localization methods, in 2011, we introduced MoVIPS (Mobile Visual Indoor Positioning System), which is based on the idea to extract visual feature points from a query image and compare them to those of previously collected geo-referenced...
Many existing approaches for WIFI-based indoor positioning systems use the received signal strength indicator (RSSI) of all the access points in reach to estimate the current location of a mobile device. Those systems' accuracy, however, is strongly influenced by external interferences and suffers both from short-term and long-term changes in the respective environments. Time-of-Flight-based (TOF)...
Although Social Network Service (SNS) providers like Facebook and Google attempt to mitigate security and privacy-related concerns of their users, abuses and misuses of personal data still make the headlines. As centralized storage of personal data is a decisive factor for unintended information disclosure, several architectures for decentralized Online Social Networks (OSNs) have been proposed. System...
Decentralized Online Social Networks (OSNs) attempt to improve user privacy and security. One example is Vegas, a Peer-to-Peer (P2P) OSN which attempts to bring its users back into complete control of the data they share. Due to its decentralized characteristics, P2P OSNs cannot support social search functions in the same way users of centralized OSNs like Facebook are familiar with. Well-known and...
Interdisziplinäre Zusammenarbeit zwischen Pflege und Ärzteschaft ist wesentlich für die optimale Versorgung von PatientInnen. Ungenügendes Wissen über die Rolle und die Kompetenzen des jeweils anderen sowie die Machtposition der Ärzteschaft erschweren eine vollwertige kollaborative Beziehung. Gesundheits- und PflegemanagerInnen kommt eine tragende Rolle in der Förderung der Arzt-Pflege Kooperation...
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