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We analyze whether radio frequency identification (RFID) technology can be used to improve the localization of mobile robots and persons in their environment. In particular we study the problem of localizing RFID tags with a mobile platform that is equipped with a pair of RFID antennas. We present a probabilistic measurement model for RFID readers that(More)
A taxonomy for and analysis of tangible interfaces Abstract There have been many research efforts devoted to tangible user interfaces (TUIs), but it has proven difficult to create a definition or taxonomy that allows us to compare and contrast disparate research efforts, integrate TUIs with conventional interfaces, or suggest design principles for future(More)
A key aspect of pervasive computing is using computers and sensor networks to effectively and unobtrusively infer users' behavior in their environment. This includes inferring which activity users are performing, how they're performing it, and its current stage. Recognizing and recording activities of daily living is a significant problem in elder care. A(More)
The role of computers in the modern office has divided ouractivities between virtual interactions in the realm of thecomputer and physical interactions with real objects within thetraditional office infrastructure. This paper extends previous workthat has attempted to bridge this gap, to connect physical objectswith virtual representations or computational(More)
This paper reports on the design and use of tactile user interfaces embedded within or wrapped around the devices that they control. We discuss three different interaction prototypes that we built These interfaces were embedded onto two handheld devices of dramatically different form factors. We describe the design and implementation challenges , and user(More)
Recent research has explored ways to obtain and use knowledge of person-object interactions. We present a novel pair of wearables, a glove and a bracelet, that detect when users interact with unobtrusively tagged objects. The glove can also report whether the grasp was with the palm or the fingertips. Both devices have been built and deployed. We present(More)
A <italic>Collaborage</italic> is a collaborative collage of physically represented information on a surface that is connected with electronic information, such as a physical In/Out board connected to a people-locator database. The physical surface (board) contains items that are tracked by camera and computer vision technology. Events on the board trigger(More)
A major event in the history of human-computer interaction (HCI) was the advent at Xerox PARC in the 1970s of the Graphical User Interface (GUI). The GUI was based on a bitmapped display, making the interface to the computer primarily a visual medium, along with a pointing device (typically a mouse), enabling the user to point to parts of the display. The(More)
Many recent studies have underscored the applicability to healthcare of a system able to observe and understand day-today human activities. The Guide project is aimed at building just such a system. The project combines novel sensing technology, expressive but scalable learners and unsupervised mining of activity models from the web to address the problem.(More)