Robert Tscharn

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Ambient light has been utilized in different application domains and holds promises as a valuable and aesthetically pleasing information channel while at the same time being very unobtrusive and requiring minimal attention. An understudied domain is the use of ambient light for subconscious guiding of spatial attention in indoor settings. We conducted a(More)
Advances in ubicomp technology encourage the development of autonomous interactive systems that serve as functional or entertaining desktop companions. However, our understanding of the design space of such interfaces is still limited. Here, we report a tripartite study design that aims at comparing visual, auditory and movement-related characteristics of(More)
Due to an increasing level of automation whilst driving, users will gain additional spare time while travelling in the future. This allows passengers to indulge in non-driving activities, e.g. staying socially connected with their friends or entertaining themselves via mobile devices, which would otherwise be considered too distracting. To facilitate this,(More)
The growing number of people at old ages (demographic change) entails more age-related deficits and diseases. One of them is dementia, a complex neurodegenerative syndrome, which affects patient's cognitive abilities (e.g. short-term memory, attention, problem-solving, language, and spatiotemporal orientation). As the people with dementia (PwD) get(More)
Studies in tangible interaction have investigated how physical object attributes can stand for abstract content (e.g. IMPORTANT IS HEAVY). A less expensive and more practical alternative to dynamically change, for example, the size, weight or temperature of tangibles, could be using color-to-abstract mappings. Grounded in embodied cognition theory, a number(More)
Indoor navigation is a challenging task for visually impaired people. Existing technologies promise to provide support for autonomous way finding; however, the accuracy of low-budget approaches is low and can lead to frustration amongst users. The presented ongoing work is based on suggestions in the literature that contextual information such as sudden(More)
Residential nursing homes will face an increasing percentage of People with Dementia (PwD). In order to understand the needs and desires of this user group, an observation study was conducted in a nursing home near Würz-burg, Germany. The observation data, conversations with relatives and caregiv-ers of PwD were clustered into an affinity diagram. The(More)
The percentage of People with Dementia (PwD) in residential nursing homes is increasing. PwD are facing difficulties in their daily activities, including way-finding. In this paper, we propose light cues as a solution for supporting PwD in orientation and way-finding in the facilities. A study on a spatial searching task with four participants was(More)
Following contextual design in a real world setting, we identified individual and social aspects, as well as needs and desires of different citizen groups that motivate citizen engagement. Through eight in-depth interviews and observations we gathered detailed qualitative data on why and when citizens participate and derived requirements for pervasive(More)
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