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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)
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)
This paper presents a mobile system that supports young students learning history at an archaeological site. It adopts gameplay as a novel and effective technique particularly suited for learning through mobile systems (m-learning). From a technological point of view, the main novelty of our system is its slim architecture. Minimal investments are required(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) evokes the question whether this(More)
BACKGROUND The benefits and indications for blood transfusion are controversial. One possible reason to transfuse is to improve functional recovery after major surgery. However, the data linking improved function with higher Hb concentration are limited. STUDY DESIGN AND METHODS A: retrospective cohort study was performed in 5793 patients at least 60(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)
TRACKING OBJECTS One straightforward way of getting input from physical user activities in office environments is to track location and location changes of objects. In other words to reduce " activities " to " object change of location ". Of course, this simplification implies considerable loss of other kinds of information, including for instance mental(More)
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. 1 To exploit the potential of mobile technologies for learning, researchers must define new teaching and learning techniques. 2 The Explore! m-learning system implements an(More)