Patrick Lindemann

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— This paper gives an overview of the Gilbert-Johnson-Keerthi (GJK) algorithm, which provides an iterative method for computing the euclidian distance between two convex sets in m-dimensional space with linear time complexity. The algorithm is very versatile and several enhancements have been published since it was first introduced. Apart from some(More)
Saving money is usually a tedious task that requires a high degree of self-control for many of us. Some people have one or more specific savings targets in mind and thus need to prioritize them. We propose connecting a savings box with a personal smartphone. Thus, people become motivated to keep track of their savings for multiple targets. Using a savings(More)
Mobile location recognition by capturing images of the environment (visual localization) is a promising technique for indoor navigation in arbitrary surroundings. However, it has barely been investigated so far how the user interface (UI) can cope with the challenges of the vision-based localization technique, such as varying quality of the query images. We(More)
People do not always think and behave rationally. Behavioral economics has produced theories to explain when and why people make such allegedly irrational decisions, for example if it comes to spending money. However, humans tend to use reference points to judge and decide. Nowadays, mobile devices can work as flexible tools to create reference points thus(More)
—In densely populated areas, we currently see a paradigm shift in personal mobility. For the younger generation, car usership is gradually replacing the need of car ownership. However, for example, when relying on car sharing solutions, users often spontaneously drive cars they are not used to. Results are increased stress and a higher risk of accidents.(More)
—Sharing information between traffic participants can improve traffic flow and safety. Currently, communication is mainly done via vehicle lighting such as brake lamps or turn signals. For enhanced information exchange, we propose using the exterior of vehicles as pervasive displays to present information that may be relevant to other traffic participants.(More)
User authentication on publicly exposed terminals with established mechanisms, such as typing the credentials on a virtual keyboard, can be insecure e.g. due to shoulder surfing or due to a hacked terminal. In addition, username and password entry can be time-consuming and thus improvable with relation to usability. As security and comfort are often(More)