Kazushige Ouchi

A real-time living activity recognition system using off-the-shelf sensors on a mobile phone

We propose an in-home living activity recognition method using only off-the-shelf sensors, namely, an accelerometer and a microphone, which are commonly applied in mobile phones. The proposed method firstly estimates a users movement condition roughly by acceleration sensing. Secondly, it classifies the working condition in detail by acoustic sensing when it estimates the condition to be working by acceleration sensing. We developed a prototype system to recognize the users living activity in real time and conducted two experiments to confirm the feasibility of the proposed method. As a result of the first experiment, three movement conditions; quiet, walking, and working, are classified with more than 95% accuracy by acceleration sensing. And it classified working into seven conditions with 85.9% accuracy by acoustic sensing. Moreover, the result of the second experiment shows that it is effective to adopt instance-based recognition according to the assumed application.

A wearable authoring system using organized multimedia data

We developed a wearable authoring system which can record a variety of multimedia data and automatically generate daily reports and personal diary. A user can record multimedia data by context sensor without using keyboard or mouse. Recorded multimedia data are indexed and organized by recognizing spoken key words and voice annotations. Using these organized multimedia data, the system can automatically generate daily reports and statistical charts in real time without editing.

The Development of a System for Sleep Care and Its Applications

This paper describes a new sleep monitoring system for home use. The basic system consists of a wearable physiological sensor and the PC software for analyzing sleep quality from users wrist motion and heart rate variability. Different from a conventional sleep monitoring device used in a hospital, the sensor is so small and easy-to-use that a normal person can use It at home. This means that the system is useful not only for a sleep specialist who wants to check his/her patients daily sleep pattern, but also is useful for self-care. The concepts of the tele-care system and the real-time control of electric appliances for creating better sleep environment are also mentioned.

An XML based multimedia data acquisition and retrieval with wearable computers

We developed an XML based multimedia data acquisition and inquiry system for wearable computers. This system can record multimedia data in mobile environments, stores recorded data into an XML native database in organized XML formats, and provides an easy access method to the stored data. An XML based general framework within the system supports users to browse search results in appropriate forms.