Experimental Evaluation of User Interfaces for Visual Indoor Navigation Visual Authentication - A Secure Single Step Authentication for User Authorization Mit mobilem Lernen zur erweiterten Methodenkompetenz Investigating Self-Reporting Behavior in Long-Term Studies Decision-Point Panorama-Based Indoor Navigation The Smartphone as Mobile Authorization Proxy Towards a Holistic Approach for Mobile Application Development in Intelligent Environments GymSkill - A Personal Trainer for Physical Exercises The Healthcare and Motivation Seat - A Survey with the GewoS Chair DriveAssist – A V2X-Based Driver Assistance System for Android Distributed Networks within ROS: Challenges and Possibilities Tool Support for Prototyping Interfaces Update Behavior in App Markets and Security Implications: A Case Study in Google Play MobiliNet: A Social Network for Optimized Mobility Gamification-supported Exploration of Natural User Interfaces