Yoshihisa Fujiwara

Title: **Innovative Contributions of Yoshihisa Fujiwara in Sleep State Estimation**

Introduction

Yoshihisa Fujiwara, a prominent inventor based in Uji, Japan, has made significant advancements in the field of sleep state estimation technology. With a total of seven patents to his name, Fujiwara is dedicated to enhancing how we understand and monitor sleep through innovative devices and methods.

Latest Patents

One of Fujiwara's latest patents is a device and program product designed to estimate the sleep state of a subject based on easily detectable respiration signals. This innovative technology allows for the estimation of sleep states—such as deep sleep and light sleep—without the need to restrain the individual being monitored. By analyzing voltage waveforms resulting from respiratory movements, the device calculates positive peak values and the intervals between these peaks. It also measures the area enclosed by the voltage waveform and the time axis, leading to the determination of average values and dispersion metrics. These calculated values contribute to establishing a preliminary sleep state, which can then be utilized to estimate the sleep state at specific time points.

Another inventive aspect of Fujiwara’s recent work is focused on providing a simplified sleep state estimation function in real-time. The device measures voltage variations caused by human respiratory movements, leading to the computation of mean peak intervals and coefficients of variation. This allows the technology to classify sleep states accurately by evaluating various threshold levels, enabling users to gain insights into their sleep patterns.

Career Highlights

Currently, Yoshihisa Fujiwara works at Sanyo Electric Co., Ltd., a company renowned for its commitment to innovation in electronic solutions. His role emphasizes both research and application of his patented technologies for practical use in consumer sleep monitoring devices.

Collaborations

Throughout his career, Fujiwara has collaborated with talented individuals in his field, including his coworkers Hirokazu Genno and Shima Okada. Their combined expertise fosters a dynamic workplace that encourages continued innovation and the development of pioneering technologies.

Conclusion

Yoshihisa Fujiwara stands out as a forward-thinking inventor in the realm of sleep state estimation. His latest patents reflect a deep commitment to improving the understanding of sleep and its impact on health, showcasing his innovative achievements as integral contributions to the field. As the demand for sophisticated sleep monitoring solutions continues to grow, Fujiwara's work will likely play a pivotal role in shaping future advancements in this important area of research.