We present the user-centered, iterative design of Mobile Facets, a mo-bile application for the faceted search and exploration of a large, multi-dimensional data set of social media on a touchscreen mobile phone. Mo-bile Facets provides retrieval of resources such as places, persons,...

The novel mobile application csxPOI (short for: collabora-tive, semantic, and context-aware points-of-interest) enables its usersto collaboratively create, share, and modify semantic points of interest(POI). Semantic POIs describe geographic places with explicit semanticproperties of a...

Dieses Dokument schlägt ein Konzept für eine Personal Key Infrastrukturin iCity vor. Über ein Trust Center (TC) ausgestellte Zertikategewährleisten einen sicheren Schlüsselaustausch mit nachweisbarer Authentisierungdes Kommunikationspartners, Abhörsicherheit sowie Unverfälschtheit und...

Conventional security infrastructures in the Internet cannot be directlyadopted to ambient systems, especially if based on short-range communi-cation channels: Personal, mobile devices are used and the participants arepresent during communication, so privacy protection is a crucial issue....

This book gives an overview of the state of the art in five different approaches to social science simulation on the individual level. The volume contains microanalytical simulation models designed for policy implementation and evaluation, multilevel simulation methods designed for detecting...