Ryohei Nakamura

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Elderly-care support is a very important issue in many developed countries because of the arrival of increasingly aging society. The increase in accidents involving the elderly becomes great concern and the requirement for monitoring their activity and state is especially increasing in care facilities. We have therefore developed a wireless monitoring(More)
This paper presents a respiratory rate monitoring sensor using stepped-FM ultra-wideband impulse-radio (UWB-IR), which does not require high speed A/D devices unlike conventional UWB-IR sensors. This sensor is also capable of co-existing with other narrowband systems operating in overlaid frequency band, since it can be designed to have any spectrum hole(More)
Wireless motion sensor such as infra-red and Doppler is commonly used for our home protection against intruder. Wideband or ultra-wideband (UWB) sensor has lately attracted considerable attention because it is expected to measure not only motion of an intruder but also the distance. This paper suggests a stepped-FM UWB sensor which can cover all the rooms(More)
The RCS of a radar target is an important factor related with the radar performance such as the detection, tracking and classification. When dealing with the design of radar system for 26/79GHz short/middle-range radars allocated for next generation perimeter surveillance radars, it is essential to know individual RCS of typical vehicles and pedestrian.(More)
Understanding cell-to-cell variability in cytosine methylation is essential for understanding cellular perturbation and its molecular machinery. However, conventional methylation studies have focused on the differences in the average levels between cell types while overlooking methylation heterogeneity within cell types. Little information has been(More)
The raccoon (Procyon lotor), indigenous to North America, has naturalized in Japan as an invasive alien species, having been introduced into the country in the 1970s. In Hokkaido, the northernmost island of Japan, feral raccoons have been increasing in number and spreading throughout the island. The age at the onset of puberty for raccoons is important for(More)
Human motion sensor such as infra-red, video camera and Doppler has attracted attention as in-home monitor sensor. Recently, ultra-wideband (UWB) radio sensor has attracted considerable attention because of its ranging some motion object. This paper presents an in-home monitoring sensor system using stepped-FM UWB radio which can estimate the human motion(More)
Teleosts have an asymmetrical caudal fin skeleton formed by the upward bending of the caudal-most portion of the body axis, the ural region. This homocercal type of caudal fin ensures powerful and complex locomotion and is regarded as one of the most important innovations for teleosts during adaptive radiation in an aquatic environment. However, the(More)
Ultra-wideband impulse-radio has some advantages for indoor high speed wireless communication such as high multipath tolerability and low power consumption. Rake diversity combining is one of the most effective techniques for improving the signal to noise ratio. The improvement depends on the number of correlation detectors (Rake fingers) in receiver.(More)