Thomas Pederson

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BACKGROUND Elders undergo approximately 40% of more than 1 million major abdominal operations annually. Yet evidence about recovery to preoperative levels of functional independence is limited. This study details course and predictors of functional recovery after elective major abdominal operations in the elderly. STUDY DESIGN This was a prospective(More)
This paper reports the experimental studies we have performed to evaluate Explore!, an m-learning system that supports middle school students during a visit to an archaeological park. It exploits a learning technique called excursion-game, whose aim is to help students to acquire historical notions while playing and to make archaeological visits more(More)
Recognizing activities based on an actor’s object manipulation is an important research approach within ubiquitous computing. We present an approach which complements object manipulation with an actor’s situational information by viewing the everyday objects used by the actor to perform his/her activities from an “egocentric perspective”. Two concepts,(More)
A novel method for tracking physical activities is presented. The method is based on the assumption that all changes to the physical environment are done by users themselves, and that these actions can be tracked using wearable computer technology placed on human hands. Various limitations of the proposed method are discussed. Acknowledging these(More)
A novel method for video-based head gesture recognition using eye information by an eye tracker has been proposed. The method uses a combination of gaze and eye movement to infer head gestures. Compared to other gesture-based methods a major advantage of the method is that the user keeps the gaze on the interaction object while interacting. This method has(More)
Carmelo Ardito, Paolo Buono, Maria F. Costabile, Rosa Lanzilotti, Thomas Pederson, andAntonioPiccinno University of Bari, Italy M-learning—the combination of e-learning with mobile technologies—captures the very nature of e-learning by providing users with independence from the constraints of time and location. To exploit the potential of mobile(More)
Sterility restrictions in surgical settings make touch-less interaction an interesting solution for surgeons to interact directly with digital images. The HCI community has already explored several methods for touch-less interaction including those based on camera-based gesture tracking and voice control. In this paper, we present a system for gesture-based(More)
Mobile phones of today often come with a static hierarchical menu structure which, due to the small size of the screen, raises some usability issues such as many switches of screens and poor relations between different screen pages. Another problem is the limited customization possibilities of the menu structure. The aim of this master thesis is to design a(More)
Among designers of knowledge work environments (KWEs) it is common to distinguish between those involved in designing the virtual part (software designers) and the physical part (office tool manufacturers, architects etc.) of the environments. Recent advances in user interface technology, for example (Fitzmaurice et al. 1995, Harrison et al. 1998, Ishii and(More)