Tetsuya Matsumura

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Avoiding a fall requires fast and appropriate step responses, stepping speed as a fall risk indicator has only been assessed in older adults. We have developed a new measurement system that applies a laser range finder to assess temporal and spatial parameters of stepping performance such as step speed, length, and accuracy. This measurement system has(More)
BACKGROUND AND AIMS Avoiding falls requires fast and appropriate step responses in real-life situations. We developed a step-tracking device that uses an infrared laser sensor for convenient assessment of stepping performance, including concurrent assessment of temporal and spatial parameters. In the present study, we created a new index for assessment of(More)
An accelerated evaluation method for the SRAM cell write margin is proposed using the conventional Write Noise Margin (WNM) definition based on the “butterfly curve”. The WNM is measured under a lower word line voltage than the power supply voltage VDD. A lower word line voltage is chosen in order to make the access transistor operate in the saturation mode(More)
A compact V-band GaAs MMIC chip set consisting of (1) a single highly integrated receiver MMIC with 6.5 dB NF and 2 dB conversion gain using a subharmonically pumped mixer and (2) a transmitter MMIC having a state-of-the-art 30-60 GHz doubler with 14.3 dB maximum conversion gain, 17.7 dBm output power and broadband RF characteristics has been successfully(More)
This paper describes an approach to the Simultaneous Localization and Mapping (SLAM) problem using a single omnidirectional camera. We consider that the robot is equipped with a catadioptric sensor and is able to extract interest points from the images. In the approach, the map is represented by a set of omnidirectional images and their positions. Each(More)
A 100-MHz 51.2-Gb/s packet lookup engine LSI for packet inspection was proposed in a previous paper. High throughput and low power consumption was realized by introducing a combined mismatch detection circuit and linked-list hash table, minimizing the amount of memory accesses. The LSI has an automatic table update function. In this paper, this automatic(More)