Wiebke Köhlmann

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Human-machine interaction by gestures helps to improve communication: it utilizes means of communication which are common to humans but alien to machines. We consider ergonomic, functional and semantic issues in gesture-based interfaces without visual feedback. Such situations arise with the unobtrusive usage of wearable devices but, more importantly, with(More)
—Students beginning their studies at university face manifold problems such as orientation in a new environment and organizing their courses. In contrast to a conventional scavenger hunt, mobile pervasive games, bridging in-game and real world activities, have the potential to provide help in a motivating manner using new technology which currently becomes(More)
Blind learners access digital materials and platforms using assistive technologies such as screen readers and braille displays. Virtual classrooms are e-learning applications, which allow learners to interact e. g. using text chat, audio and video conference and dynamic whiteboard. However, their dynamic, interactive and visual character poses barriers to(More)
Virtuelle Klassenzimmere rmöglichend ie Durchführung von Veranstaltungen in Echt-zeitan verteilten St andorten. DieTeilnahme von blinden Lernenden wird jedoch durch vielfältige Barrieren behindert. Dieser Beitrag beschreibt eine prototypische Erweiterungdes virtuellenopen-source Klassenzimmers BigBlueBut tonu m ein Aktivitätsprot okoll,(More)