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In co-located gaming, a player is often watched by another person who has no direct interaction with the game. For such a potential onlooker, the game setting is mainly experienced with ones eyes by looking at what happens on the screen. An integration of an onlooker's gaze into the game could potentially improve the game experience of player and onlooker.(More)
Handheld touch screen based devices, such as smartphones or tablets, typically provide limited haptic feedback. On cur- rent devices, what is visually perceived and what is tactile and kinesthetically felt is semantically uncoupled. In order to improve embodied interaction on handheld screen based devices, new ways to provide richer haptic feedback are re-(More)
In this paper we regard the navigation aid provided by mobile navigation systems in a real environment and the effects of these mobile assistants to the development of spatial knowledge. Therefore, we report on a user study concerning the acquisition of spatial knowledge. This study sets up on a former study described by Krüger and colleagues and sheds(More)
In this paper we report results of an experiment that investigates the effects of mobile pedestrian navigation systems on the development of route and survey knowledge acquired by the users. In the experiment directions were presented incrementally step-by-step in different modalities (i.e. audio, graphics) and through different media (PDA, clip-on(More)
This paper reports on extensions to a decision-theoretic location-aware shopping guide and on the results of user studies that have accompanied its development. On the basis of the results of an earlier user study in a mock-up of a shopping mall, we implemented an improved version of the shopping guide. A new user study with the improved system in a real(More)
Normally, mobile pedestrian navigation systems use visually perceptible landmarks to guide their users through the environment. In this article we introduce concepts for the use of auditory perceptible landmarks in route descriptions. Such auditory perceptible landmarks complement their visual counterparts and also stand to be beneficial for certain groups(More)
COMPASS2008 is a general service platform developed to be utilized as the tourist and city explorers assistant within the information services for the Beijing Olympic Games 2008. The main goals of COM-PASS2008 are to help foreigners to overcome language barriers in Beijing and assist them in finding information anywhere and anytime they need it. Novel(More)
We will describe new cross-lingual strategies for the development multilingual information services on mobile devices. The novelty of our approach is the intelligent modeling of cross-lingual application domains and the combination of textual translation with speech generation. The final system helps users to speak foreign languages and communicate with the(More)
Authentication based on touch-less mid-air gestures would benefit a multitude of ubicomp applications, which are used in clean environments (e.g., medical environments or clean rooms). In order to explore the potential of mid-air gestures for novel authentication approaches, we performed a series of studies and design experiments. First, we collected data(More)
In this paper we describe an exploratory design study of the potentials of taste as a playful interaction modality. We present the design and implementation of LOLL<i>io</i> -- an interactive lollipop that serves as a haptic input device that dynamically changes its taste. We conclude this paper with three basic principles for potential game designs, where(More)