Kajiro Watanabe

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We have developed a noninvasive pneumatics-based system by which to measure heartbeat, respiration, snoring, and body movements of a subject in bed. A thin, air-sealed cushion is placed under the bed mattress of the subject and the small movements attributable to human automatic vital functions are measured as changes in pressure using a pressure sensor(More)
This paper describes a novel method to estimate sleep stage through noninvasive and unrestrained means. The Rechtschaffen and Kales (R-K) method is a standard to estimate sleep stage. However, it involves restraining the examinee and, thus, induces psychological stress. Furthermore, it requires specialists with a high degree of technical expertise and the(More)
Gait analysis is widely recognized as a promising tool for obtaining objective information on the walking behavior of Parkinson's disease (PD) patients. It is especially useful in clinical practices if gait properties can be captured with minimal instrumentation that does not interfere with the subject's usual behavioral pattern under ambulatory conditions.(More)
Accurate knowledge on the absolute or true speed of a vehicle, if and when available, can be used to enhance advanced vehicle dynamics control systems such as anti-lock brake systems (ABS) and auto-traction systems (ATS) control schemes. Current conventional method uses wheel speed measurements to estimate the speed of the vehicle. As a result, indication(More)
This paper describes a method to estimate the measure of human energy expenditure referred to as metabolic equivalents (METs). The measure is defined by an index of the amount of energy a person expends through normal daily activities. The average MET values are defined by the type of activity; for example, brisk walking corresponds to 4 METs. The index(More)
Long-term monitoring of heart rate, respiratory rate, and body movement in neonates would be useful for preventing illnesses, such as respiratory disorders. However, currently, there is no noninvasive monitoring system available for neonates. Therefore, in this study, we proposed a modified, noninvasive, piezoceramic-facilitated biometric system to allow(More)
In recent years, ubiquitous computing technologies have been applied in the field of medicine. Especially radio frequency identification (RFID) and small sensor networks could provide information about medical practices and patient status in order to prevent malpractices and improve the quality of medical care. As an example of this application, we(More)