DEDICATION

To my family and friends In recent years, mobile devices have rapidly penetrated into our daily lives. Several draw-backs of mobile devices have been mentioned so far, such as their limited computational capability, small screen real estate, and, so on, as compared with notebook or desktop computers. However, if we focus on the most powerful feature of mobile devices, namely mobility, we can explore possibilities for a new user interface of the devices. In this paper, we use PDAs and propose intuitive techniques of information transfer for mobile devices, which could not otherwize be achieved with notebook or desktop computers. Our sys-tem, Toss-It, enables a user to send information from the user’s PDA to other electronic devices with a “toss ” or “swing ” action, as the user would toss a ball or deal cards to oth-ers. Implementation of Toss-It largely consists of three parts- gesture recognition, location recognition, and file transfer system. In this thesis, we describe these three parts of our implementation, and finally evaluate and affirm practicability and usability of Toss-It